WO2001087137A2 - Implantable sensor - Google Patents
Implantable sensor Download PDFInfo
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- WO2001087137A2 WO2001087137A2 PCT/US2001/014929 US0114929W WO0187137A2 WO 2001087137 A2 WO2001087137 A2 WO 2001087137A2 US 0114929 W US0114929 W US 0114929W WO 0187137 A2 WO0187137 A2 WO 0187137A2
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- Prior art keywords
- sensor
- vessel
- stent
- blood glucose
- blood
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/145—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue
- A61B5/1486—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using enzyme electrodes, e.g. with immobilised oxidase
- A61B5/14865—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using enzyme electrodes, e.g. with immobilised oxidase invasive, e.g. introduced into the body by a catheter or needle or using implanted sensors
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/0002—Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network
- A61B5/0031—Implanted circuitry
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6846—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive
- A61B5/6847—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive mounted on an invasive device
- A61B5/6862—Stents
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6846—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive
- A61B5/6867—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive specially adapted to be attached or implanted in a specific body part
- A61B5/6876—Blood vessel
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2560/00—Constructional details of operational features of apparatus; Accessories for medical measuring apparatus
- A61B2560/02—Operational features
- A61B2560/0204—Operational features of power management
- A61B2560/0214—Operational features of power management of power generation or supply
- A61B2560/0219—Operational features of power management of power generation or supply of externally powered implanted units
Definitions
- the present invention generally relates to the use of sensors to monitor the concentration of a chemical species in bodily fluids. More specifically, the present invention relates to the use of sensors to monitor glucose levels, and/or other parameters in a fluid, including flow rate within a lumen of an endoluminal implant such as a stent or other type of endovascular conduit.
- Diabetes mellitus is a serious medical condition affecting approximately 10.5 million Americans, in which the patient is not able to maintain blood glucose levels within the normal range (normoglycemia). Approximately 10% of these patients have insulin-dependent diabetes mellitus (Type I diabetes, IDDM), and the remaining 90% have non- insulin-dependent diabetes mellitus (Type II diabetes, NIDDM).
- IDDM insulin-dependent diabetes mellitus
- NIDDM non- insulin-dependent diabetes mellitus
- the long-term consequences of diabetes include increased risk of heart disease, blindness, end-stage renal disease, and non-healing ulcers in the extremities.
- the economic impact of diabetes to society has been estimated by the American Diabetes Association at approximately ⁇ 45.2 billion annually (Jonsson, B., The Economic Impact of Diabetes, Diabetes Care 21 (Suppl 3): C7-C10, (1998)).
- the first category is non-invasive sensors, which obtain information from physico-chemical characteristics of glucose (spectral, optical, thermal, electromagnetic, or other).
- the second category is invasive sensors. In this group, there is intimate mechanical contact of the sensor with biological tissues or fluids, since the device is placed within the body. (Wilkins, 1996).
- Non-invasive sensor technology has focused on the absorption of the near-infrared (NIR) spectra by the analyte, in this case, glucose (See U.S. Patent No. 5,945,676 to Khalil, et al., and U.S. Patent No. 5,433,197 to Stark). Absorptions which occur in the NIR region are most often associated with overtone and combination bands of the fundamental vibrations of -OH, -NH, and -CH functional groups. As a result, most biochemical species will exhibit some absorption in the region of interest. Glucose measurements are usually performed in the spectra region from
- Implanted glucose sensors could be used to provide information on continuously changing glucose levels in the patient, enabling swift and appropriate action to be taken. In addition, daily glucose concentration measurements could be evaluated by a physician.
- An implantable sensor could also provide an alarm for hypoglycemia, for example, overnight, which is a particular need for diabetics. Failure to respond can result in loss of consciousness and in extreme cases convulsive seizures.
- a hyperglycemic alarm would provide an early warning of elevated blood glucose levels, thus allowing the patient to check blood or urine for keto ⁇ e bodies, and to avert further metabolic complications.
- Invasive glucose sensors may be categorized based on the physical principle of the transducer being incorporated.
- Current transducer technology includes electrochemical, piezoelectric, thermoelectric, acoustic, and optical transducers.
- thermoelectric thermoelectric
- acoustic surface acoustic wave
- glucose oxidase GOD
- hexokinase G-6-phosphate dehydrogenase
- glucose dehydrogenase G-6-phosphate dehydrogenase
- Hexokinase is an enzyme that catalyzes the phosphorylation of glucose by ATP to form glucose-6- phosphate and ADP.
- glucose-6-phosphate dehydrogenase in the following reaction:
- NADPH + H + The formation of NADPH may be measured by absorbance at 340 nm or by fluorescence at 456 nm (Jaffari,
- Glucose dehydrogenase is another enzyme, which may be used for monitoring glucose in the following reaction:
- Glucose + NAD GlucoseDehydrogenase D-glucono- ⁇ -lacto ⁇ e + NADH
- the NADH generated is proportional to the glucose concentration.
- Glucose oxidase is the most commonly used enzyme reported in the literature. Its reaction is relatively simple, inexpensive, and may be monitored using a variety of techniques.
- the reaction can therefore be monitored by the consumption of oxygen, the production of hydrogen peroxide, or the change in acidity due to the increase of gluconic acid.
- a critical factor in the design of an implanted sensor is the anatomical site in which it is implanted.
- a few investigators have developed monitoring systems, which can be placed within the vascular system. Armour et al. ("Application of Chronic Intravascular Blood Glucose Sensor in Dogs", Diabetes 39:1519-26 (1990)) implanted a sensor into the superior vena cava of six dogs for a period of up to 15 weeks with relative success.
- Armour et al. Application of Chronic Intravascular Blood Glucose Sensor in Dogs", Diabetes 39:1519-26 (1990) implanted a sensor into the superior vena cava of six dogs for a period of up to 15 weeks with relative success.
- the majority of investigators have focused on subcutaneous implantation.
- a major drawback to subcutaneous implantation is the body's defense against foreign objects: the "foreign- body response".
- foreign-body giant cells will form a "wall" around the object, which is subsequently followed by the formation of a fibrous capsule.
- the object is a blood glucose sensor, it will no longer be in intimate contact with body fluids, and the signal will drift and stability will be lost.
- sensor stability There are numerous reports of sensor stability being lost in about a week (Wilson, G.S., et al., "Progress Towards The Development Of An Implantable Sensor For Glucose", Clin. Chem.
- Implantable insulin pumps are feasible for implantation for over one year (Jaremko, J. et al., "Advances Towards the Implantable Artificial Pancreas for Treatment of Diabetes,” Diabetes Care, 21 (3): 444-450 (1998)).
- the research was inspired by the goal of the development of the artificial pancreas, and promising initial clinical trials using implantable insulin pumps.
- development of implantable insulin pumps is at a very advanced stage, with units being implanted for over 2 years in canines (Scavani et al., "Long-Term Implantation Of A New Programmable Implantable Insulin Pump," Artif.
- an implantable blood glucose sensor for implantation in a blood vessel, which can provide useful blood glucose readings for an extended period of time, without material interference from thrombus formation, embolization, or other foreign body response.
- the sensor is capable of continuous or near continuous monitoring, and driving an implantable insulin pump and/or making blood glucose data available to the patient or medical personnel.
- the present invention generally relates to the use of sensors to monitor the concentration of a chemical species in bodily fluids, and more specifically, to a novel sensor configuration to monitor glucose levels in a body vessel.
- the device is an implantable glucose sensor, which is delivered to the patient's vascular system preferably transluminally via a catheter, using a stent or stent-graft as a platform.
- One feature of the device is that the sensor surface is placed at the apex of the lu inal surface of a streamlined housing, so that the shear rate at the sensor/blood interface is sufficient to minimize the thickness of the formed thrombus layer. In this manner, significant tissue deposition or encapsulation due to potential fibrotic reactions is minimized, and transport of glucose to the sensor is not altered over time.
- a blood glucose detector for implantation within a blood vessel.
- the blood glucose detector comprises a support, having a first side for contacting the wall of the vessel and a second side for facing radially inwardly towards the center of the vessel.
- a sensor is carried by the support, and the sensor has a sensing surface thereon.
- the sensing surface is spaced radially inwardly from the first side by a distance of at least about 0.2 to 2.5 mm, such that the velocity of blood in the vessel inhibits obstruction of the sensing surface.
- the distance is at least about 0.5mm.
- the blood glucose detector further comprises a transmitter on the support, for transmitting information from the sensor to an external receiver.
- the support comprises an expandable tubular body.
- the tubular body may be either a balloon expandable or a self-expandable component such as a stent.
- the tubular body may be further provided with a tubular sheath on the radially inwardly directed surface and/or the radially outwardly directed surface.
- the sensor comprises an analyte permeable membrane and an enzyme gel layer.
- a method of prolonging the useful life of a sensor in a blood vessel comprises the steps of providing a sensor having an analyte sensing surface thereon, and positioning the sensor at a site in a blood vessel such that the sensing surface is positioned radially inwardly from the vessel wall by a sufficient distance that the blood flow shear rate at the sensing surface substantially delays obstruction of the sensing surface.
- the positioning step comprises carrying the sensor on a catheter and transluminally advancing the catheter to the site.
- an implantable sensor for sensing the presence of an analyte in a vessel.
- the sensor comprises a tubular support structure for anchoring the sensor in a vessel.
- the support has a sidewall with a luminal side facing towards the center of the vessel and an abluminal side facing towards the wall of the vessel.
- a sensor housing is carried by the support structure, the housing having a streamlined exterior configuration to minimize blood flow turbulence.
- a power supply and electrical circuitry are provided in the housing, and a sensing surface carried by the housing is exposed to the exterior of the housing. The sensing surface is positioned on the radially inwardly most portion of the luminal side of the housing.
- the support structure comprises an expandable metal coil or mesh.
- the sensor housing may be positioned on the luminal side of the support structure or the abluminal side of the support structure.
- FIGURE 1A is a perspective view of an expanded stent with an embedded sensor housing on its abluminal side.
- FIGURE 1 B is a block diagram of remote circuitry for an external monitoring device.
- FIGURE 1 C is a diagram of a wearable or implantable insulin pump.
- FIGURE 2 is a perspective partial cut away view of a stent sensor device surrounded by a sheath.
- FIGURE 3 is a cross-section taken along the line 3-3 in Figure 2.
- FIGURE 4 is an enlarged cross-sectional view through the sensor element of Figure 3.
- FIGURE 5A is a cross-sectional view through a stent showing one mounting configuration of an embedded sensor in accordance with one embodiment of the present invention.
- FIGURE 5B is a cross-sectional view as in Figure 5A of a stent with an alternate configuration for the embedded sensor.
- FIGURE 5C is a cross-sectional view as in Figure 5 A of a stent with an embedded sensor mounted completely on the luminal side of the stent.
- FIGURE 6A is a perspective view of an alternate support structure in accordance with the present invention.
- FIGURE 6B is a perspective view of a further support structure in accordance with the present invention.
- FIGURE 6C is a perspective view of the support structure illustrated in FIGURE 6A, provided with an outer fabric sheath.
- FIGURE 7A is a side elevational view of the distal end of a catheter-based delivery system for a stent sensor device.
- FIGURE 7B is a cross-sectional view of a catheter-based delivery system for a rolled sheet type self- expanding stent with an embedded sensor.
- FIGURE 7C is a cross-sectional view of a catheter-based delivery system, which uses a restraining sheath, for a self-expanding stent with an embedded sensor.
- FIGURE 7D is a cross-sectional view of a catheter-based delivery system, with a pull-away sheath, for a self -expanding stent with an embedded sensor.
- FIGURE 7E is a cross-sectional view of a catheter-based delivery system for a balloon expandable stent with an embedded sensor.
- FIGURE 8 is a cross-sectional view of the catheter-based delivery system taken along the 8-8 line of FIGURE 7A.
- FIGURE 9A is a cross-sectional view through a stent showing a transducer across the cross-section of the stent in accordance with the present invention.
- FIGURE 9B is a perspective view of an expanded stent with an embedded sensor housing on its abluminal side and a transducer across the cross-section of the stent.
- FIGURE 9C is an enlarged cross-sectional view of the transducer of FIGURE 9B, taken from the 9C-9C line.
- FIGURE 9D is a perspective partial cut away view of a stent sensor device surrounded by a sheath with a transducer partially across the cross-section of the stent.
- FIGURE 9E is a perspective view of an expanded stent with an embedded sensor housing on its abluminal side and four perpendicular transducers placed partially across the cross-section of the stent.
- an intraluminal blood glucose sensor is provided on a support structure such as a modified stent of the type implanted following percutaneous transluminal coronary angioplasty (PTCA) for the treatment of atherosclerosis.
- PTCA percutaneous transluminal coronary angioplasty
- Atherosclerosis is the build-up of fatty deposits or plaque on the inner walls of a patient's arteries. These lesions decrease the effective size of the artery lumen and limit blood flow through the artery, prospectively causing a myocardial infarction or heart attack if the lesions occur in coronary arteries that supply oxygenated blood to the heart muscles.
- a guide wire is inserted into the femoral artery and is passed through the aorta into the diseased coronary artery.
- a catheter having a balloon attached to its distal end is advanced along the guide wire to a point where the stenotic lesions limit blood flow through the coronary artery.
- the balloon is then inflated, compressing the lesions radially outward against the wall of the artery and substantially increasing the size of the arterial lumen, to improve blood circulation.
- stents are being used in place of or in addition to PTCA for treatment of atherosclerosis, with the intent of minimizing the need to repeatedly open a stenosed artery.
- stents are generally configured as elongate cylindrical structures that can assume two different states, one having a substantially greater diameter than the other.
- a stent is implanted in a patient's vascular system using an appropriate delivery system. There are two basic types of stents.
- the first type is termed “balloon expandable”, and refers to stents that are expanded radially outward due to the force from an inflated angioplasty balloon, such as the Palmaz-Schatz stent, the Gianturco-Roubin stent, and the Strecker stent.
- the second type is termed “self-expandable”, and refers to and those that are self -expanding, such as the HemobahnTM and
- SMART StentTM made of nickel titanium memory alloy
- Wallstent made of Elgiloy
- a stent carried by a delivery catheter is advanced through a guide catheter to a site within the patient's artery.
- a balloon disposed inside the stent is inflated to a pressure ranging from about six to ten atmospheres.
- the force produced by the inflated balloon expands the stent radially outward beyond its elastic limit, stretching the vessel and compressing the lesion to the inner wall of the vessel.
- a self-expanding stent expands due to spring force following its positioning within the artery, after a restraining sheath is retracted from the compressed stent.
- the balloon is deflated and removed from inside the stent and the catheter and other delivery apparatus is withdrawn.
- the lumen through the vessel should be substantially increased, improving blood flow.
- a clinical examination and either an angiographic or ultrasonographic morphological procedure is performed to evaluate the success of the procedure in opening the diseased artery or vessel. These tests are typically repeated periodically, e.g., at six-month intervals, since restenosis of the artery may occur.
- the stent may be modified from those intended for supporting a treatment site following angioplasty, in view of the preferred placement in a healthy section of the vessel as is discussed in greater detail below.
- the wall of the stent may be modified to support the sensor, as is also discussed in greater detail below.
- a stent provides a useful platform for a variety of additional reasons. For example, it is impractical to pass an electronic conductor through the wall of an artery or vessel to monitor the condition of an implanted sensor for long periods of time. Also, any active glucose sensor must be energized with electrical power. Again, it is not practical to supply power to such a sensor through any conductor that perforates the vessel wall or that passes outside the patient's body.
- endoluminal implant encompasses stent-grafts, which are also sometime referred to as "covered stents.”
- a stent-graft is a combination of one or more stents and a synthetic graft that is typically implanted at a desired point in a vessel using an endoscopic approach. The stent is attached either to the ends or throughout the body of the synthetic graft, and is used to hold the graft in position. Sometimes, hooks are provided on the stent to ensure that the graft remains in the desired position within the vessel.
- Endoluminal implants are used in other body passages in addition to blood vessels. For example, they are sometimes used to maintain an open lumen through the urethra, or through the cervix. A stent placed adjacent to an enlarged prostate gland can prevent the prostate from blocking the flow of urine through the urinary tract. Tracheal and esophageal implants are further examples of endoluminal implants. In these and other uses of an endoluminal implant, provision for monitoring parameters related to the status of flow and other conditions in the patient's body would be desirable. Information provided by monitoring such parameters can enable more effective medical treatment of a patient.
- IVUS intravascular ultrasonography
- Another important factor, and related, is that the stents must be placed in close apposition to the vessel wall, so that the only flow obstructions are at the luminal surface of the stent struts. They later demonstrated that by using non-compliant balloons at high pressure (18 atm), that even the final assessment using IVUS is not required; an important consideration for centers lacking such equipment. Thus, it is very important to minimize flow disturbances which may be created by stent implantation. This is more critical in the smaller coronary arteries, which range from about 2.5-4 mm in diameter, than it is in other, larger arteries, where small amount of mural thrombus will have less effect on the volumetric flowrate.
- a layer of fibrin clot deposits on the luminal surface of the implanted stent. After 3-4 weeks, the fibrin layer is typically remodeled into fibro-collagenous tissue, with a layer of endothelial cells present on the flow surface.
- a relatively thick layer of fibro-collagenous tissue forms on the surface of an endovascular sensor, it may experience the same loss of signal that has been reported for subcutaneously implanted sensors. That is, a modified type of "foreign-body response" may occur, and glucose may not be able to freely and rapidly diffuse to the sensor.
- the stent-sensor combination of the present invention should- be placed in a relatively healthy portion of the artery. If it is placed in a stenotic or calcified area, it may be difficult for the device to expand completely, so the device may be more narrowed than is intended, resulting in thrombotic fouling of the sensor, or distal embolization may occur. If the device is placed in an aneursymal vessel, it may expand more than intended, and again, fail to function as designed.
- FIGURE 1 A shows a perspective view of an expanded implantable sensor device 10 having a proximal end 12, a distal end 5 and a central lumen 16 extending therethrough.
- the expanded implantable sensor device 10 is comprised of a stent 14 and a sensor 20.
- the stent 14 illustrated in FIGURE 1A resembles a Palmaz-Schatz stent, it is understood that any of a wide variety of stent configurations can be utilized such as those identified below. Whether the stent is a balloon expandable or self -expandable variety, the stent 14 comprises a tubular sidewall 18, which may be compressed to a relatively small diameter for delivery using a catheter, and which may be expandable to the approximate diameter of the vessel or to a diameter approximately 5-25% greater than the diameter of the vessel lumen.
- a self-expanding variety of stent or stent-graft such as the S.M.A.R.T. Stent (Cordis Corp., Miami, FL) or Hemobahn (W.L. Gore & Associates, Flagstaff, AZ) is preferred, since the presence of the sensor body may impede proper expansion of the stent platform using a balloon.
- the sensor housing can preferably be attached to the stent by use of adhesives, by tying (suturing) the two components together, or by use of thermal bonding, soldering, welding or brazing, or mechanical interfit or the like.
- the sensor and sensor housing should be attached to the stent along a single row of stent struts, so that the struts may fully expand without needing to stretch the sensor housing, or being constrained by the sensor housing.
- the expanded inside diameter of the device may range from 3 to 20 mm, and the length of the device may range from 1 to 30 cm.
- the radially inwardly facing or radially outwardly facing sidewall of the stent may also be covered by a sheath as is known in the art. The sheath can be bonded to the surface of the stent so that the sheath remains in close apposition to the vessel wall.
- a sensor 20 contains the sensing circuitry within its housing.
- the attachment between the sensor 20 and the stent can take any of a variety of forms as will be apparent to those of skill in the art in view of the disclosure herein.
- adjacent axially extending parallel struts of the stent design illustrated in FIGURE 1A spread circumferentially apart upon expansion.
- the stent 20 should be mounted to only colinear axial struts along the length of the stent unless the mounting is designed to accommodate circumferential separation of parallel struts.
- the sensor 20 may be positioned in an aperture which is cut in the sidewall of the stent 14, and attached to the strut portions adjacent to the edge of the aperture. Attachment may be accomplished in any of a variety of ways, such as by the use of adhesives, thermal bonding, soldering, welding or brazing, or mechanical interfit, depending upon the construction materials of the stent 14 and the sensor 20.
- the sensor 20 may be solvent bonded, adhesively bonded or otherwise attached to an expandable tubular sleeve which is positioned concentrically about the stent 14. Other attachment configurations can be devised by those of skill in the art in view of the disclosure herein.
- all or a portion of the sensor 20 is positioned on the radially outwardly facing surface of the tubular sidewall 18.
- Positioning the sensor 20 on the radially outwardly facing surface may advantageously optimize blood flow through the central lumen 16 and/or reduce turbulence in the central lumen 16.
- the sensor 20 may be positioned on the radially inwardly facing surface (sometimes referred to herein as the luminal surface) of the stent.
- the stent struts or other elements which make up the sidewall 18 may be removed or modified at the portion of the sidewall corresponding to the sensor 20 such that the sensor 20 may be mounted within the resulting opening in the sidewall.
- the implantable sensor device 10 in accordance with the present invention, is preferably positioned within a healthy section of the vessel, the radial strength normally required for a stent in a post-angioplasty application is unnecessary.
- the present inventor believes that any reduction in radial support which may result from reasonably dimensioned apertures or other modifications to the sidewall to attach sensor 20 will not adversely affect the role of the stent as a sensor support structure in the context of the present invention. Additional details concerning the position of the sensor 20 with respect to the tubular wall 18 will be discussed below in connection with Figures 5A-5C.
- the sensor circuitry 22 includes a sensing circuit 24, which is connected to a signal processing circuit 26, which is connected to a power source 28, a radio transmitter 30, and an antenna (not shown) to transmit signals about the glucose concentration to a remote device.
- the antenna (not shown) may be a thin wire wound around the stent 10.
- the power source 28 may be inductively coupled to an external device, or it may be a thin film rechargeable battery, as in Bates, J.B. et al., "Thin Film Rechargeable Lithium Batteries for Implantable Devices", ASAIO J., 1997 43:M644-M647, which is incorporated herein by reference.
- the sensing circuit 24 is in electrical communication with a sensing surface (not illustrated in Figure 1A) for sensing the analyte of interest in the fluid stream.
- the sensor surface is preferably positioned radially inwardly from the radially inwardly facing surface of the tubular sidewall 18, to improve the useful life of the device as is discussed elsewhere herein.
- the sensor surface is displaced radially inwardly such as by a radially inwardly extending portion of the housing or other support (not illustrated) to achieve the desired radial position of the sensor surface.
- the sensor surface may be positioned directly on a radially inwardly-most extending portion of the sensor 20 as is discussed elsewhere herein.
- the sensor surface is preferably covered by a semi-permeable membrane (not shown), which contacts passing blood when the stent 14 is placed in a blood vessel.
- the permeability of the membrane is selected to allow blood glucose, or the analyte of interest to freely contact the sensor, while restricting the passage of other blood components.
- the semi-permeable membrane may comprise ePTFE, Dacron ® , polyurethane, silicone rubber, polyflactide- co-glycolide) (PLGA), poly(caprolactone) (PCL), polyethylene glycol) (PEG), collagen, polypropylene, cellulose acetate, poly(vinylidene fluoride) (PVDF), nafion or other biocompatible material.
- These membrane materials may also be used for the tubular sheath which can be used to surround either the luminal or abluminal surfaces of the stent.
- the membrane of the sheath may be bonded to the stent by adhesives or by tying (suturing) the two components together or by use of thermal bonding, soldering, welding or brazing, or mechanical interfit.
- the pore size of the lumenal membrane may be large enough to allow cells to come through if it covers the sensor surface, but the sensor membrane should have a pore size (MW cutoff of about 1000) which will allow glucose to pass, while restricting the passage of larger molecules.
- the entire tube surface does not have to be composed of the same membrane material.
- the part of the device near the sensing element can be composed of a different material or have a different porosity than the material in the rest of the device.
- a remote circuit 32 is equipped with an antenna 34 and a signal processing unit 36, which converts the electronic signal from the embedded sensor into a concentration level or other indicium of the analyte.
- a signal processing unit 36 which converts the electronic signal from the embedded sensor into a concentration level or other indicium of the analyte.
- an alarm circuit 38 and a display 40 are also provided.
- Information regarding the level of the analyte of interest can be displayed on the display 40 such as a monitor 42.
- the signal processing unit 36 may be provided with a lookup table or other baseline of normal or expected values for the analyte of interest. If the concentration of the analyte goes outside of the prescribed range, or if an electronic failure is detected, a warning audible, visible, or tactile signal is preferably produced from the alarm system 38.
- a transmitter 44 may also be included in the remote circuitry 32 in order to transmit data about the level of the analyte of interest to an implantable infusion pump, or the like.
- the remote circuitry 32 can be provided in any of a variety of physical forms, depending upon the intended use of the device.
- the remote circuitry 32 can be provided in a desktop or bedside housing and coupled directly to a display 40 such as a monitor 42.
- ambulatory patient devices may be provided by deleting a permanent coupling to the monitor 42 and packaging the remaining components of remote circuit 32 in a wearable form, such as a compact self-contained unit adapted for attachment to the wearer's clothing or including straps so that it can be strapped to the patient's body.
- the signal processing unit 36 includes sufficient memory to record the glucose values over a predetermined period of time.
- the patient can couple the wearable device to an external monitor 42 or other electronics periodically, such as one or more times per day.
- Analyte data may thereafter be displayed in readable form, such as on a monitor 42 in table form or in graph form with a time unit on the X axis and a glucose value or derivative data on the Y axis.
- the wearable unit may additionally be provided with a data export coupling, such as a telephone connector, for connecting the signal processing unit 36 via internal or external modem into the telephone system. In this manner, the patient can transmit condensed analyte data to the healthcare provider for further monitoring and/or analysis.
- the wearable unit may additionally be provided with one or more manual data inputting elements ranging from a simple push button to a keypad, to allow manual data entry relating to significant dietary or other events. For example, meal times, significant fluid intake, manual insulin injection or other administration, or any of a variety of other significant events can be marked in the data, so that the patient or reviewing medical personnel can correlate the event with the blood glucose data.
- an implantable or externally wearable infusion pump 46 may be controlled by the remote circuit 32 via a receiver 48 in the pump, or may be manually controlled using sensor information only as a guideline.
- the infusion pump 46 may be refilled through an appropriately designed port 50 such as a pierceable septum using a hypodermic needle or other appropriate delivery system.
- the infusion pump 46 may be implantable, as described by Irsigler et al., (' ' ' Controlled Drug Delivery in the
- the sensor 10 comprises a cylindrical stent wall 18 surrounded by a sheath 52.
- An antenna (not shown) may be wound around the body of the sensor 10 and connected to the power source or the transmitter.
- All relevant electronics are schematically illustrated as in electronics housing 54 which is electrically coupled to a sensor 56 by one or more conductors 57. All such junctions of dissimilar metals are coated with polymers which are impermeable to bodily fluids in order to reduce galvanic corrosion.
- the analyte sensing element 56 is covered with a membrane 62 ( Figure 4) which is permeable to the analyte of interest.
- the analyte sensing element 56 extends radially inwardly within the sensor 10 where blood flow conditions are optimal.
- the illustrated analyte sensing element 56 contains an enzyme gel layer 64, which is placed adjacent to the outer permeable membrane 62.
- the analyte diffuses through the membrane 62 to the gel enzyme layer 64.
- the reaction between the analyte and the enzyme occur in the gel enzyme layer 64.
- the reaction products then pass through an inner membrane 66 and react at the surface of a noble metal electrode 68, producing a current.
- An appropriate potential is applied to the electrode 68 from the power source contained in electronics housing 54 resulting in a signal, which is sent to the signal processing unit.
- the signal is then passed through the transmitter which transmits the information regarding the analyte of interest to an external monitor and/or implantable pump as has been discussed.
- the power source, the signal processing unit, and the transmitter are completely encapsulated in a housing 55 which is impermeable to biological fluids.
- the same housing 55 or a separate housing 70 also encapsulate the analyte sensor except for the membrane 62.
- the sensor(s) to be incorporated into the device may be either electrochemical, piezoelectric, thermoelectric, acoustic, or optical.
- electrochemical glucose sensors These generally incorporate an enzyme, which selectively reacts with glucose.
- Electrochemical biosensors may be categorized as amperometric, conductometric, or potentiometric.
- Amperometric measurements are based on the oxidation or reduction or electrochemically active substances involved in the oxidation of glucose via glucose oxidase.
- Another method is measurement of changes in local pH due to the gluconic acid produced using a potentiometric sensor, usually a coated-wire pH selective electrode and/or ion-selective field effect transistor (ISFET).
- ISFET ion-selective field effect transistor
- Conductometric sensors are based on the principle of electrical resistance changes during the reaction.
- Potentiometric and conductometric sensors are currently limited due to the presence of numerous interfering chemicals in the environment.
- the main disadvantage of these sensors is their low sensitivity.
- the response of the potentiometric sensor depends on logarithmic changes in analyte concentration.
- ISFET's ion selective field effect transistors
- Amperometric sensors respond linearly to the analyte concentration. If the limiting processes in signal generation are the enzymatic reactions, the dependence of the signal on glucose concentration is non-linear according to Michaelis-Me ⁇ to ⁇ kinetics. When the sensor operates in a glucose diffusion-limited mode, the signal is linearly proportional to the analyte concentration. Amperometric sensors are further subdivided into three classes: 1) Based on the production of hydrogen peroxide or consumption of oxygen.
- Oxygen -electrode based sensors
- Clark oxygen electrode employs a platinum cathode held at a potential of approximately (-)0.6 V versus the saturated calomel electrode (S.C.E.), a sufficiently negative potential to reduce oxygen as follows: 0 2 + 4H + + 4e - 2 H 2 0 Because the species being measured in this reaction is a gas, interference from other species in the biological fluid is negligible. However, the signal is determined from reduction of the initial current, making glucose determinations at low concentrations difficult.
- the system requires the use of a second electrode without any glucose oxidase, to determine the local oxygen tension for the glucose measurement.
- the ratio of blood glucose to oxygen can be as high as 10 to 1 in arterial blood, and 100 to 1 in venous blood. (Jaffari 1995)
- An oxygen electrode sensor has been described by Armour et al. (1990), which was implanted in the superior vena cava of six dogs for up to 15 weeks, with good agreement with standard in vitro assays.
- Hydrogen Peroxide based sensors measure hydrogen peroxide production based on the oxidation of glucose at potentials above + 600 mV vs. SCE. This signal is directly related to the concentration of glucose in the sample.
- Bindra et al. Bodra, D.S. et al., "Design and in vitro studies of a needle type glucose sensor for subcutaneous monitoring," Anal. Chem., 63: 1692-6 (1991)
- a needle-type sensor which consisted of GOD immobilized onto cellulose acetate as an inner membrane, and polyurethane as an outer membrane.
- Moussy et al. (Moussy, F. et al., "Performance of subcutaneously implanted needle-type glucose sensors employing a novel trilayer coating," Anal.
- Chem., 65: 2072-7 (1993) used a needle type sensor with a trilayer coating. Nafion was used as an outer membrane, and poly (o-phenylenediamine) as an inner membrane to reduce interference from small electroactive species. GOD was immobilized between these two layers. As with the oxygen electrodes, the reaction must be limited by glucose, not oxygen.
- amperometric sensors with mediated electron transfer oxygen as an electron acceptor is substituted by an artificial mediator, to overcome the tissue oxygen dependence of amperometric biosensors.
- Ferrocene and its derivatives are the most commonly used, although hexacyanoferrate (III), tetrathiafuvalene, and ruthenium hexamine (Jaffari, 1995) have also been investigated. In these sensors, a process involving the mediator instead of oxygen takes place:
- Amperometric sensors with direct electron transfer are independent of the oxygen concentration and involve direct oxidation of glucose by GOD at an electrode constructed from conducting organic salts (charge-transfer organic complexes with electron conductivity). Sensors based on this principle have been tested in vivo in rats, but little is presently known about the biocompatibility of such materials.
- an amperometric electrode is used.
- the characteristics of such an electrode such as one available from Minimed, Inc. (Sylmar, CA), is related to the production of hydrogen peroxide in the conversion of glucose to gluconic acid by glucose oxidase.
- the noble metal electrode 68 may be connected to any of a variety of RF transceivers. To avoid the use of batteries, which may be too large for this application, the system may be powered by, and signal transmission occurs via an inductive link. This requires an inductive coil (not shown) to be placed both inside the external receiver and an inductive coil (not shown) within the implantable sensor device 10.
- the transceiver coil in the preferred embodiment is specifically adapted for use with a stent platform.
- the size of the coil, in addition to the number of turns around the implant limits the power and signal transmission distance between the implant and the external receiver/power supply.
- the coil is wound around the outside of the implantable sensor device 10.
- the transceiver coil is made from an electrically conductive material, and is coated to prevent corrosion. The coil may be aligned with and bonded to the struts of the implantable sensor device 10, in order to minimize any impact on expansion of the implantable sensor device 10.
- the struts of the implantable sensor device 10 themselves may serve as the antenna coil.
- the internal and external coils should be aligned so that their major axes are parallel.
- the external receiver coil should contain a ferrite core to optimize power and signal transmission.
- the external receiver and power supply should be designed so that it can be worn on the patient's body, and can be oriented to maximize the signal from the implanted sensor. This can be done by custom-placed foam padding to orient the external receiver and power supply.
- the sensor device may be held in place within the vessel by any of a variety of anchoring systems other than a graft or stent.
- anchoring systems other than a graft or stent.
- any of a variety of anchoring structures may be provided with hooks or barbs to engage the vessel wall.
- semicircular cages or struts may be used, which only extend through a partial circumference of the vessel.
- FIGURE 6A shows struts 74 that can be positioned securely against a blood vessel.
- An axially extending strut 76 connects the circumferential struts 74 , and also could support a sensor.
- the support 72 can be manufactured in a variety of ways, such as by injection molding a suitable polymeric material or by laser cutting from stainless steel, Nitinol or other tube stock.
- FIGURE 6B shows alternate struts 74 that can be secured against the vessel wall. Again, connecting struts 74 is one or more connecting struts 76.
- FIGURE 6C shows a modification of the device shown in FIGURE 6A, where the support 72 is provided with a sheath 180.
- a catheter-based delivery system In order to implant an implantable sensor device within the vasculature of the patient, a catheter-based delivery system is used. All implantable sensor devices are formed to include a central lumen with a diameter in the reduced profile sufficient to allow passage of a guide wire and a catheter tip through it. The implantable sensor device is mounted onto a catheter tip, and then collapsed to as small a diameter as possible. The implantable sensor device may be deployed by removal of a deployment sheath, or other methods, which may be preferred for the specific type of stent platform being employed. These methods are well known in the art. After the implantable sensor device is deployed, the catheter and guidewire are removed from the (now enlarged) central lumen in the implantable sensor device. The implantable sensor device is placed such that neither the catheter nor the guidewire adversely affects the electronic circuitry.
- the implantable sensor device is implanted in a relatively large artery or vein (> 5 mm) in order to minimize the risk that the implant may occlude the artery.
- a healthy artery or vein should be chosen, so that the device can open completely, and so that the flow patterns are normal.
- stent jail it is now accepted practice to place the stent in a parent vessel so that the stent struts cross the ostium of a side branch vessel. This is called “stent jail.” (Pan, M., et al., "Simple and Complex Stent Strategies for Bifurcated Coronary Arterial Stenosis Involving the Side Branch Origin," Am. J. Cardiol., 83: 1320-25 (1999)).
- stent-grafts for aortic aneurysm repair, investigation is being carried out regarding stent struts which cross the renal artery ostia.
- An example of such a suprarenal device is the Talent Aortic Ste ⁇ t-Graft (Medtronic, Inc.). This suggests that it is possible to have a wire (or transducer) which is placed directly across an artery without thrombus formation or thrombo-embolization.
- the senor or sensing element i.e., the transducer
- the transducer can be placed directly across the path of the flowing blood, on a surface with low cross-sectional area, such as a wire with a diameter of 0.003" to 0.025", or a ribbon, oriented with its narrow edge facing upstream.
- the transducer or sensor can be placed on either the proximal, distal, or lateral faces of the wire or ribbon.
- FIG. 9A shows a cross-sectional view through a stent 14, which includes a sensing element 120 consisting of a wire-like noble electrode 68, which in turn is covered by a gel-enzyme layer 64 and finally by an analyte-permeable membrane 62.
- the outside of the analyte-permeable membrane 62 is bound to a wire-like structure made of a shape memory material 1 10 such as nitinol, which is either part of or is bonded to the stent 14.
- the shape memory material allows the electrode 68 and sensing element 120 to be positioned directly across the lumen of the vessel, as described above.
- the electrode 68 is connected to the signal processing unit (not shown) through a conductor (not shown).
- the remainder of the implantable sensor 10, including the power source, signal processing unit, transmitter, and stent, are positioned to be flush against the vessel wall.
- FIG. 9B shows an implantable sensor device 10 with a sensing element 130 across the cross-section of the stent 14, with sensor circuitry 22.
- FIG. 9C shows an enlarged cross-sectional view of the sensing element 130 of
- FIG. 9B taken along the 9C-9C line.
- the sensing element 130 consists of a wire-like noble electrode 68, which in turn is covered by a gel-enzyme layer 64 and finally by an analyte-permeable membrane 62.
- the outside of the analyte- permeable membrane 62 is bound to a wire-like structure made of a shape memory material 1 10 such as nitinol, which is bonded to the stent 14 on at least one end.
- the sensing element 130 is connected to the sensing circuit 24 through a conductor (not shown).
- FIG. 9D illustrates a transducer 140, consisting of a wire-like noble electrode 68, which in turn is covered by a gel-enzyme layer 64 and finally by an analyte-permeable membrane 62, which is bound to a wire-like structure made of a shape memory material 1 10 such as nitinol, which is bonded to the stent 14.
- the sensing element 140 is connected to the sensing circuit 24 through a conductor (not shown).
- FIG. 9E shows another configuration with quadruple sensing elements 150, each at right angles to each other, attached to stent 14, with sensor circuitry 22.
- the sensing elements 150 are connected to the sensing circuit 24 through a conductor (not shown).
- multiple transducers could be positioned to form a wire mesh, provided the mesh size is sufficiently large to permit blood flow without significant thrombo-embolization.
- a very small sensor surface area impedes blood flow, compared to the blood vessel's cross- sectional area.
- the catheter 80 comprises a proximal end 82, a distal end 84 and an elongate flexible tubular body 86 extending therebetween.
- the length of the tubular body 86 will vary depending upon the intended access point and deployment site for the stent sensor. For example, lengths in the area of about 120 cm to about 140 cm are typical for use in a coronary artery implantation by way of a femoral artery percutaneous puncture site. Other lengths for different access sites and deployment sites will be apparent to those of skill in the art in view of the disclosure herein.
- the tubular body 86 may be manufactured in accordance with any of a variety of known techniques, such as by extrusion of appropriate biocompatible polymeric materials.
- Known materials which are commonly used for this application include high density polyethylene, polytetrofluroethylene, nylons, and a variety of others known in the art.
- the lengths of the tubular body 86 may comprise a spring coil, solid wall hypodermic needle tubing, or braided reinforced wall, depending upon the functional requirements of the catheter.
- the tubular body 86 will be provided with an approximately circular cross-sectional configuration having an external diameter within the range of from about 0.025 inches to about 0.065 inches.
- the tubular body 86 comprises a multilume ⁇ extrusion having an external diameter of about 0.042 inches (3.2f) throughout substantially all of its length.
- the tubular body 86 can have diameters as large as 12 Fr or higher; for percutaneous placement into larger vessels such as the iliac artery. Additional dimensions, materials and manufacturing techniques are well known in the angioplasty catheter art.
- the proximal end 82 is provided with a manifold 88, having a variety of access ports depending upon the desired functionality of the catheter 80.
- the manifold 88 is provided with a guidewire port 90 and a deployment wire port 94.
- Manifold 88 may be manufactured by injection molding, or other techniques known in the art.
- the distal end 84 of deployment catheter 80 is provided with a collapsed support structure 96 having a sensor housing 20 thereon in accordance with the present invention.
- the support structure 96 is illustrated in its collapsed, low profile configuration, such as for transluminal advancement towards a placement site.
- the tubular body 86 may be provided with an annular recess 98 near the distal end 84, for receiving the support structure 96.
- the tubular body 86 may be provided with a recess for receiving the sensor housing 20, thereby reducing the collapsed profile of the loaded catheter 80.
- the support structure 96 may be constrained in its reduced crossing profile configuration in any of a variety of ways as has been discussed. In this illustrated embodiment, the support structure 96 is restrained in its collapsed configuration by a deployment wire 94.
- Deployment wire 94 extends throughout the length of the tubular body 86 through a deployment wire lumen 108, such that a proximal end of the deployment wire 94 may be proximally retracted by the clinician.
- the distal end of the deployment wire 100 exits the tubular body 86 at a deployment wire port 100, and loops the support structure 96 in one or more loops or slip knots 102 to restrain the support structure
- Loops or slip knots 102 are configured such that proximal retraction on deployment wire 94 causes the loops or slip knots 102 to become untied or otherwise disengaged, thereby releasing the support structure 96 so that it expands radially outwardly from its low profile introduction configuration to its radially enlarged implanted configuration.
- the catheter 80 is preferably introduced over a guidewire as is known in the art.
- a distal guidewire opening 104 is in communication with the proximal guidewire port 90 by a guidewire lumen 106 extending therebetween.
- the self-expanding implantable sensor device 96 can be deployed from a tubular restraining sheath 108 by pushing a rod 1 10 optionally attached to a disk 112, until the implantable sensor device 96 is pushed clear of the restraining sheath 108.
- a rod 1 10 optionally attached to a disk 112
- An example of such a technique is described in U.S. Patent No. 5,411,551 to Winston et al. (issued May 2, 1995).
- FIGURE 7C another deployment method for a self-expanding implantable sensor device 96 is shown.
- the implantable sensor device 96 is restrained onto the shaft of the catheter 1 14 by a sheath 1 16 and a tether line 118.
- the sheath 1 16 unfolds when the tether line 1 18 is pulled, allowing the implantable sensor device 96 to deploy.
- FIGURE 7D another deployment method for a self-expanding implantable sensor device 96 is shown.
- the implantable sensor device 96 is restrained onto the shaft of the catheter 120 by two or three or more restraining prongs 122,124.
- the restraining prongs 122,124 are retracted when one or more deployment wires 126 are pulled, allowing the implantable sensor device 96 to expand.
- An example of this can be shown in U.S. Patent No. 6,024,763 to Lenker et al. (issued February 15, 2000), which is herein incorporated by reference.
- the rails are only designed to minimize frictional forces between a deployment sheath and the device. They are not actually used as the deployment mechanism.
- prongs can be used to minimize the delivery profile of the device. Since the sensor and electronic circuitry may not collapse to a profile as small or as circular as a stent or stent-graft, it may be more appropriate to position the electronic components on one side of the catheter, and layer the collapsed stent on the opposite side of the catheter. This could be achieved by use of delivery prongs, as described.
- the implantable sensor device 96 may be deployed by use of a suitable balloon catheter 128 if a balloon expandable stent platform is used.
- the balloon 130 is inflated at elevated pressures of 2 to
- the balloon 130 is deflated and then the balloon catheter 128 is withdrawn.
- Use of such balloon catheters is well known in the art.
- the housing design should keep the blood shear rate at the apex of the housing sufficiently high that there is minimal thrombosis on this surface and any formed thrombus will be of minimal thickness.
- diffusion of glucose through the semi-permeable membrane 62 should be the rate-limiting step, and surface of the device should not become covered in a fibrous capsule, as in the case of subcutaneous sensors.
- the glucose reacts with the glucose oxidase to produce hydrogen peroxide, which further reacts to produce an amperometric signal.
- the amperometric signal is converted by an appropriately designed electronic circuit so that it may be transmitted using the RF transceiver.
- the surface of the sensor 20 should be placed on the luminal side of the stent.
- the electronic components of the sensor should be encapsulated in a conformal coating such as a fluoropolymer or a polyamide, and injection-molded or dip-coated in a silicon rubber, polyuretha ⁇ e, or other biocompatible housing material.
- the sensor housing should be given a streamlined shape, with gradually sloped transitions at both its proximal and distal ends, in order to minimize flow disturbances.
- the housing should be as wide or wider at its base than at its apex. The apex of the housing should not protrude higher than 5-50% of the diameter of the fully deployed device.
- the glucose permeable membrane 62 should be placed at the apex of the housing, , should not be encapsulated in the housing material, and should face the bloodstream.
- the glucose permeable membrane 62 should occupy the majority of the area of the housing apex.
- the stent may be placed on either the luminal or abluminal surface of a graft material. If the graft is place on the abluminal surface of the stent, the sensor should be placed on the luminal surface of the graft.
- the graft material is preferably a fluoropolymer, such as ePTFE.
- the housing is placed on the luminal surface of the graft, it is bonded by partially dissolving the housing material thermally or using an appropriate solvent so that the housing becomes physically interpenetrated with the graft or with an appropriate adhesive, such as melt-processed poly(tetrafluoroethylene-co-hexafluoropropyle ⁇ e) (FEP).
- FEP melt-processed poly(tetrafluoroethylene-co-hexafluoropropyle ⁇ e)
- the height of the sensor is estimated to be 2 to 3 times the thickness of a stent strut, based on some observations of a limited number of stent designs (Virmani, 1999). This estimate represents the approximate thickness of the fibrous tissue layer above the stent surface.
- the sensor height above the stent luminal surface should be 1-2 times the thickness of a stent strut.
- the strut thickness varies with design, but is roughly 0.005" to 0.010" (0.13 to 0.26 mm).
- the housing should protrude about 0.2 to 0.5 mm above the stent luminal surface.
- the effect that this will have on the target vessel is a function of the diameter of the vessel, as given in the. following table:
- This table also provides insights into the intrusion of the sensor as a percentage of post-deployment vessel diameter.
- a native vessel with greater than 50% diameter stenosis is clinically defined to be a restenotic vessel, and typically requires re-intervention. It is estimated that the sensor should not obstruct more than about 25% of the vessel diameter.
- the percent area loss of a vessel, along with a sensor height can be examined and examples are tabulated below:
- the sensor height can range from about 0.3 to 2.5 mm in height above the stent luminal surface.
- flow measurements in piping systems are commonly obtained from the pressure drop across a restriction, such as a Venturi meter.
- the restriction in area is about 43.8%
- the velocity within the restriction is about 178% of the upstream velocity
- the velocity within the restriction is approximately 111 % of the upstream velocity.
- the senor may be flush mounted against the wall of the vessel, with a flow impedance device mounted at the same axial position within the vessel, in order to increase the velocity within the sensor/impedance device to about 125-200% of the proximal flow velocity.
- the location where the estimate of the proximal flow velocity is approximately 200 % is preferred. This would allow for the possibility of flush mounted sensors.
- the sensor Prior to implantation, the sensor may be checked for a linear response to glucose concentration. This may be done in the operating theater using sterile technique immediately prior to implantation, or may be done in a batch-wise manner during the manufacturing process. Following implantation, the sensor may then be calibrated by comparison of the output signal with an accepted standard. Typically, this may be done by comparing the signal with the value obtained from a laboratory glucose sensor, such as made by Yellow Springs Instruments (Yellow Springs, OH).
- the calibration curve should be stable over time and for wide range of glucose values. For example, the slope of the calibration curve should be sufficiently stable to give an error of less than ten percent. Weekly calibrations should be sufficient to insure stable and accurate readings, however calibration can be performed as frequently as required.
- An audible, visible or tactile alarm may sound, so that the patient or physician may check the sensor with a home glucose monitoring kit (e.g., One Touch, LifeScan, Johnson & Johnson), and then take appropriate action such as administration of insulin or glucose.
- a home glucose monitoring kit e.g., One Touch, LifeScan, Johnson & Johnson
- the signal may be transmitted directly to an implantable insulin pump, which may administer insulin directly without requiring a response by the patient.
- FIGURES 5A-C show various embodiments in which the sensor and transmitter are on either the luminal or abluminal surface of the stent.
- an implanted sensor 20 is shown in a transverse cross- sectional view through the vessel.
- the struts 60 of the implantable sensor device may be surrounded by an inner tubular sheath (not illustrated for simplicity), which would contact the blood vessel wall when deployed.
- the sensor housing 20 sits between a pair of struts 60.
- the membrane 62 is exposed to the blood flow.
- the analyte sensor 56 will normally have a larger cross-sectional area than the stent struts 60.
- the outer sheath allows for enhanced uniform radial expansion (beyond that of self-expanding struts), especially if the sheath is bonded to each of the struts 60 of the stent, and is bonded through the length of the stent, not just at the ends. This would link each of the struts 60 to its neighbors, preventing uneven expansion. It would also be advantageous to make the sheath out of a material which could be stretched slightly to obtain its final diameter, so that irregularities in the flow surface are minimized, except in the region of the sensor.
- the stent struts 60 can be embedded more deeply into the vessel wall than the sensor housing 20. If the struts 60 were positioned between the flowing blood and the sensor surface, they would cause flow stagnation, and therefore thrombosis on the membrane 62 of the sensor. If the sensor is placed instead on the luminal surface of the stent, the sensor will again be embedded less deeply in the vessel wall, although without struts 60 on its luminal surface, there will be minimal hemostasis and thrombus formation on the transducer surface.
- the stent struts could be placed either between the stent struts and the inner sheath, or on the luminal surface of the inner sheath. In both cases, a semi-permeable membrane might still be necessary to insure that only the analyte of interest reaches the surface of the sensor. In either case, the sensor should be designed with a streamlined profile at both its proximal and distal ends, to minimize regions of hemostasis.
Abstract
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Also Published As
Publication number | Publication date |
---|---|
AU2001259656A1 (en) | 2001-11-26 |
US6442413B1 (en) | 2002-08-27 |
US6895265B2 (en) | 2005-05-17 |
US20020128546A1 (en) | 2002-09-12 |
US20030009093A1 (en) | 2003-01-09 |
WO2001087137A3 (en) | 2009-06-04 |
US7033322B2 (en) | 2006-04-25 |
AU2001259656A8 (en) | 2009-07-16 |
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