US20070142774A1 - System and Method for Delivering Thermally Sensitive and Reverse-Thermal Gelation Materials - Google Patents

System and Method for Delivering Thermally Sensitive and Reverse-Thermal Gelation Materials Download PDF

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US20070142774A1
US20070142774A1 US11/619,091 US61909107A US2007142774A1 US 20070142774 A1 US20070142774 A1 US 20070142774A1 US 61909107 A US61909107 A US 61909107A US 2007142774 A1 US2007142774 A1 US 2007142774A1
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catheter
solution
tube
fluid
reverse
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US11/619,091
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Daniel Rosenman
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Biocardia Inc
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Biocardia Inc
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Assigned to BIOCARDIA reassignment BIOCARDIA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ROSENMAN, DANIEL C.
Assigned to BIOCARDIA, INC. reassignment BIOCARDIA, INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: BIOCARDIA DEVICECO, INC.
Assigned to BIOCARDIA DEVICECO., INC. reassignment BIOCARDIA DEVICECO., INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: EXPRESSION DIAGNOSTICS, INC.
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/44Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests having means for cooling or heating the devices or media
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/00491Surgical glue applicators
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00Catheters; Hollow probes
    • A61M25/0067Catheters; Hollow probes characterised by the distal end, e.g. tips
    • A61M25/0082Catheter tip comprising a tool
    • A61M25/0084Catheter tip comprising a tool being one or more injection needles
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/00234Surgical instruments, devices or methods, e.g. tourniquets for minimally invasive surgery
    • A61B2017/00238Type of minimally invasive operation
    • A61B2017/00243Type of minimally invasive operation cardiac
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/00491Surgical glue applicators
    • A61B2017/005Surgical glue applicators hardenable using external energy source, e.g. laser, ultrasound
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00Catheters; Hollow probes
    • A61M2025/0004Catheters; Hollow probes having two or more concentrically arranged tubes for forming a concentric catheter system
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00Catheters; Hollow probes
    • A61M25/0067Catheters; Hollow probes characterised by the distal end, e.g. tips
    • A61M25/0082Catheter tip comprising a tool
    • A61M25/0084Catheter tip comprising a tool being one or more injection needles
    • A61M2025/0089Single injection needle protruding axially, i.e. along the longitudinal axis of the catheter, from the distal tip
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2205/00General characteristics of the apparatus
    • A61M2205/36General characteristics of the apparatus related to heating or cooling
    • A61M2205/3633General characteristics of the apparatus related to heating or cooling thermally insulated

Definitions

  • This application relates generally to catheters, and more specifically to catheters and methods for delivering thermally sensitive gelation materials and reverse-thermal gelation materials to remote sites in the body.
  • doctors want to deliver a therapeutic agent to a target area and have the agent remain in the target area to treat the tissue for an extended period of time. If the therapeutic agent has the consistency of liquid, the body quickly and efficiently carries it away from the target area. As a result, the duration of time that the agent has to treat the target area is short.
  • Catheters are traditionally used to deliver therapeutic agents to remote target areas in the body. Generally catheters traverse the vascular pathways of the body until the tip of the catheter reaches the target area. Catheters are used in the cardiovascular, gastric, general, urological, neurological, and oncological fields of medicine. The target area can be a blood vessel, an organ, or a tumor. Catheters have been used to deliver acute therapeutic agents such as analgesic, antibacterial, anti-restenotic, anticancer, anti-inflammatory agents and hormones, and bulking agents such as collagen and stainless steel micro-embolic coils. However, due to the small size and long length of the catheters they cannot deliver viscous materials such as gels to remote sites in the body.
  • reverse-thermal gelation gels also known by the trademarked name PLURONIC® gels or TETRONIC® gels, available from BASF and other suppliers.
  • These gels are characterized by the property of being liquid below a critical solution temperature and becoming viscous, or gel-like, above the critical solution temperature. This is in contrast with normal matter that is solid below a critical temperature, for example, the freezing temperature and liquid above that critical temperature, exhibiting decreased viscosity as the temperature of the matter increases.
  • the critical solution temperature of these gels can be tailored by their chemistry such that they are liquid at room temperature or below (0-23° C.) and gel at body temperature (37° C.).
  • Gels however, cannot be delivered to remote sites in the body such as the heart or the brain through a catheter because the gels are too viscous to be injected.
  • the devices and methods claimed below allow thermally sensitive gelation materials to be injected into remote sites within a patient's body.
  • the injection catheter includes a hollow needle, a catheter body, a handle, and a syringe.
  • the syringe is located at the proximal end of the injection catheter and the hollow needle is located at the distal end.
  • One embodiment includes a thermally insulated injection catheter that has an insulated catheter body.
  • the insulated catheter body includes a catheter wall, a stainless steel mesh layer, an insulation layer, and a solution tube.
  • the catheter body can also include second tube, called the alternate tube, which extends from the distal to the proximal end of the catheter. This alternate tube joins the solution tube at a Y-junction proximate to the hollow needle.
  • Another embodiment includes a catheter body having a catheter wall, a solution tube, an input tube and an output tube.
  • the input tube surrounds the solution tube and carries a fluid, gas or liquid, along the length of the solution tube for maintaining the therapeutic solution in a liquid state.
  • a further embodiment combines cooling fluid and reverse-thermal solution into one tube by injecting reverse-thermal solution “plugs” separated and carried by the cooling fluid.
  • the plugs move down the tube, pushed by the force of injected saline. Once the discrete plugs are lodged in the target area, the saline would be transported away by the body, leaving the reverse-thermal solution plug in place to harden and elute its therapeutic agent over time.
  • therapeutic solution is in a reservoir located at the distal end of the catheter.
  • the therapeutic solution is liquefied at a neck section, which is located proximate to the hollow needle that delivers the therapeutic solution.
  • the input tube coils around the neck section and the fluid flows, in the direction of the arrow D, through the input tube liquefying the therapeutic solution, then out the output tube.
  • FIG. 1 is an isometric view of an injection catheter.
  • FIG. 2 is an isometric view of a cross-section of an insulated catheter body.
  • FIG. 3 is an isometric view of a cross-section of a catheter body having a Y-junction.
  • FIG. 4 is an isometric view of a cross-section of a catheter body having an input tube, an output tube, and a solution tube.
  • FIG. 5 is an isometric view of an injection catheter having a fluid input and fluid output.
  • FIG. 6 is an isometric view of a cross-section of a catheter body having an input tube coiled around a solution tube.
  • FIG. 7 is an isometric view of a cross-section of a catheter body having a reservoir, a neck section with a coil.
  • FIG. 8 is an isometric view of an injection catheter in use.
  • FIG. 9 is an isometric view of the distal end of an injection catheter in use in the heart.
  • the devices and methods described below provide for the delivery of controlled-release therapeutic agents to distant locations in the body through small access areas.
  • a therapeutic solution is a thermally sensitive gelling material combined with a therapeutic agent.
  • thermally sensitive gelling material includes both normal thermal gels and reverse-thermal gels.
  • a thermal gel that works in a patient's body must gel at body temperature and be a liquid at a temperature higher than body temperature. Examples of such materials are collagen and PLA/PLG copolymers.
  • PLURONIC® gel is a reverse-thermal gel that can be used in a patients body.
  • a thermal solution is a combination of a normal thermal gel and a therapeutic agent
  • a reverse-thermal solution is a combination of a reverse-thermal gel and a therapeutic agent.
  • solution is used in its broad sense, and is meant to encompass a solution, a suspension, and any other form of combining a gel with a therapeutic agent.
  • FIG. 1 illustrates an injection catheter 1 .
  • the injection catheter includes a hollow needle 2 , a catheter body 3 , a handle 4 , and a syringe 5 .
  • the syringe is located at the proximal end of the injection catheter and the hollow needle is located at the distal end.
  • the term hollow needle is meant to encompass any hollow puncturing element.
  • the hollow needle is typically a 27 or 28-gauge needle that is in fluid communication with the syringe.
  • the syringe provides the force for moving the therapeutic solution through the catheter body.
  • the syringe 5 is coupled to the catheter body 3 through a first luer 7 that can be fixed or rotating hemostatic type.
  • the handle 4 advances the catheter body and optionally transmits torque to the catheter body.
  • the catheter body carries the therapeutic solution from the syringe, or other injection device, to a target area within the patient's body.
  • FIG. 2 shows a thermally insulated injection catheter that has an insulated catheter body 10 .
  • the insulated catheter body includes a catheter wall 11 , a stainless steel mesh layer 12 , an insulation layer 13 , and a solution tube 14 .
  • the catheter wall is typically PEBAX® thermoplastic and is approximately 0.125′′ in outside diameter.
  • the solution tube transports the therapeutic solution from the syringe, out of the needle, to the target area.
  • the insulation layer and the stainless steel mesh layer limit the transfer of heat between the patient's body and the therapeutic solution, thus maintaining the therapeutic solution in the liquid state as it travels through the insulated catheter body to the target area.
  • the catheter wall 11 is typically PEBAX® resin, and typically 0.118′′ in outside diameter and 0.091′′ in inside diameter. It may be constructed of varying durometers or flexibilities from proximal to distal end. The durometer ranges for this type of catheter are typically from 75D to 30D.
  • the catheter may be lined with Teflon, PTFE, ETFE, FEP, polyethylene, polypropylene, or FPA to allow the transition from one diameter to another.
  • the stainless steel mesh layer 12 can be stainless steel braiding or coiling which increase torque transmission and elastic bending properties.
  • the diameter of the stainless steel wires typically used in this construction is 0.0025′′.
  • the wires may be round or flat.
  • the braiding is typically around 90 picks per inch.
  • the insulation layer 13 is soft material that has low thermal conductivity, such as, closed or open-celled foams of polyurethane, silicone, polyvinyl alcohol or other thermoplastics or thermosetting plastics.
  • the insulation layer can be made up of windings of flat materials that include these foams, thermoplastics, papers, cellulose, and other thermally insulating materials. The winding pattern and stiffness of these materials are designed to allow the catheter to bend easily so that it can negotiate curves in the patient's vasculature to advance to the target area.
  • the insulation layer 13 could be replaced by a high heat capacity fluid or material.
  • a fluid or material whose critical temperature is near the delivery temperature of the reverse-thermal solution keeps the reverse-thermal solution cool by taking heat away from it.
  • the catheter could be filled with this fluid or material at room temperature or it could be precooled before it was used in the catheter lab. This fluid or material (solid, gel or liquid) is protected from the heat of the circulating blood by the insulating properties of the catheter wall.
  • the solution tube 14 has an outer diameter of typically 0.030′′ and the inner diameter is sized to fit over the 27or 28-gauge needle (typically 0.016′′ inside diameter).
  • the solution tube material can be silicone, urethane, polyethylene, Teflon, PTFE, ETFE, FEP, FPA, polyolefin, PEO or other thermoplastic that is easily extruded.
  • the solution tube carries the therapeutic solution from the syringe to the hollow needle on the distal end of the catheter.
  • the needle is typically constructed of stainless steel but could be insulated with a thermally insulating material (thermoset or thermoplastic) or made of such a material.
  • FIG. 3 shows a second preferred embodiment which includes a second tube, called the alternate tube 16 , extending from the distal to the proximal end of the catheter.
  • the alternate tube joins the solution tube at a Y-junction 17 proximate to the hollow needle 2 .
  • the surgeon could inject radiopaque contrast through this tube to better visualize locations in the body.
  • This tube could also be used to flush the distal hollow needle or helix of the therapeutic solution after the solution had been injected into the target area. This would ensure that no therapeutic solution resides in the exposed hollow needle thus reducing the small likelihood that the solution could solidify within the device.
  • heated saline could be injected into the alternate tube 16 where the alternate tube is insulated.
  • the heated saline would flush the distal end of the catheter after the reverse-thermal solution had been delivered. Additionally, the heated saline would speed the gelling of the reverse-thermal solution within the target area.
  • cooled saline could be injected into the alternate tube.
  • FIG. 4 shows a third preferred embodiment which includes a catheter body 3 having a catheter wall 11 , a solution tube 14 , an input tube 18 and an output tube 19 .
  • the input tube surrounds the solution tube and carries a fluid, gas or liquid, along the length of the solution tube through the catheter body toward the distal end of the catheter.
  • the output tube surrounds the input tube and carries the fluid away from the distal end of the catheter.
  • the catheter wall surrounds the output tube.
  • An opening 21 at the distal end of the catheter connects the input tube 18 and the output tube 19 , such that the fluid flows from the proximal end of the catheter to the distal end of the catheter through the input tube.
  • the fluid then flows in the direction of the arrow A into the output tube. Once in the output tube the fluid flows to the proximal end of the catheter.
  • the distal plug 22 prevents fluid from flowing out of the distal end of the catheter into the patient's body.
  • the fluid is either a heating or a cooling fluid, depending on whether the therapeutic solution is a thermal solution or a reverse-thermal solution.
  • a heating fluid is used if a thermal solution is used, and a cooling fluid is used if a reverse-thermal solution is used.
  • the fluid keeps the therapeutic solution in the liquid state as it travels through the catheter.
  • the fluid convectively cools or heats the therapeutic solution.
  • the term “fluid” is meant in its broad sense, and includes liquids and gases.
  • a compressed gas such as, nitrogen, carbon dioxide, air, oxygen, helium or other gas can be used as the fluid.
  • FIG. 5 shows the syringe 5 , filled with the therapeutic solution in the liquid state, is connected to the catheter body via a first luer 7 . Also connected to the catheter body, via a second luer 23 , is a fluid source container 24 . Further connected to the catheter body, via a third luer 25 , is a fluid output container 26 .
  • the therapeutic solution flows from the syringe 5 through the catheter body 4 out of the needle 2 into the target area.
  • the fluid flows from the fluid source container 24 into the input tube, through the opening into the output tube and finally into the fluid output container 26 .
  • a pump 30 draws up the fluid, which can be water, saline, radiopaque contrast material or a gas etc., from the fluid source container and pressurizes it into the proximal end of the input tube of the catheter.
  • Gravity, a pressurized reservoir, hand pressure or other supply of pressurized fluid can also supply the pressure to move the fluid through the catheter.
  • FIG. 6 shows the input tube 18 being wrapped in a spiral fashion around the solution tube 14 forming a coil 27 . Once the coil reaches the distal end of the catheter, it changes direction 180 degrees and becomes the output tube 19 returning the fluid to the proximal end of the catheter and into the fluid output container.
  • cooling fluid flows out the distal end of the catheter into the body.
  • the cooling fluid in this case could be saline. If the cooling fluid is saline, it can continuously empty into the bloodstream without adverse effects on the patient.
  • the pressure of the fluid carries it out of the catheter and into the fluid output container.
  • the fluid will flow into the fluid output container, if it is open to the atmosphere. Because of the thermal capacity of the fluid and the volume of fluid flow, the therapeutic solution is kept in the liquid state until it exits the catheter into the target area.
  • the pump can be placed on the output-side of the catheter and could develop a vacuum that would draw the fluid through the catheter instead of pushing it from the input-side.
  • the preferred embodiment also includes controllers to change the rate at which the fluid is pumped, the input temperature of the fluid, and thermocouples tied to temperature readouts which monitor the temperature of the therapeutic solution as it exits the catheter into the target area.
  • FIG. 7 shows another preferred embodiment, which includes a reservoir 34 filled with the reverse-thermal solution.
  • the reservoir is located at the distal end of the catheter.
  • the reverse-thermal solution is cooled at a neck section 35 , which is located proximate to the hollow needle 2 that delivers the reverse-thermal solution.
  • the input tube 18 coils around the neck section and the fluid flows, in the direction of the arrow D, through the input tube cooling the reverse-thermal solution then out the output tube 19 , in the direction of the arrow C.
  • the reservoir has a large, constant cross-section. The cooling of the reverse-thermal solution occurs just proximal to the hollow needle 2 liquefying a small amount of reverse-thermal solution.
  • This small amount of reverse-thermal solution is dispensed by the pressure of the reservoir of reverse-thermal solution in the gelled state which acts like a syringe plunger when pressurized at the proximal end of the catheter. Because the large gel reservoir is of a constant cross-sectional area, it can be forced forward under mild pressure (but not through the small opening of the distal needle).
  • the same configuration could be used wherein the reservoir is filled with the thermal solution.
  • the fluid carried in the input tube heats the neck section thus liquefying the thermal solution in the neck section in order to inject the thermal solution into the target area.
  • Another embodiment combines cooling fluid and reverse-thermal solution into one tube by injecting reverse-thermal solution “plugs” separated and carried by the cooling fluid.
  • the plugs move down the tube, pushed by the force of injected saline. Once the discrete plugs are lodged in the target area, the saline would be transported away by the body, leaving the reverse-thermal solution plug in place to harden and elute its therapeutic agent over time.
  • the proximal end of the device could have a two-position stopcock that either feeds cool saline or cooled saline carrying discrete plugs, depending on which input source is selected by the stopcock position.
  • FIGS. 8 and 9 show the catheter in use.
  • the catheter can, for example, deliver the therapeutic solution to the heart 38 , where it slowly releases growth factors to treat coronary artery disease over a period of time.
  • the injection catheter is routed through the aortic valve 39 to the left ventricle 40 of the heart inside a hollow guide catheter (not shown) specially shaped for this access.
  • the needle of the catheter is buried in the wall of the myocardium 41 .
  • the proximal syringe 5 is depressed to dispense the physician-specified amount of therapeutic solution into the myocardium.
  • the injection catheter is removed from the myocardium and repositioned to another site or removed from the patient's body.
  • the injected therapeutic solution then becomes more viscous under the influence of the body temperature of the patient and thus remains in place to elute its therapeutic agents over a period of time.
  • the therapeutic solution for injection into the heart muscle includes anti-arrythmia agents, angiogenic growth factors, and other agents having therapeutic effects on heart tissue.
  • Implantation of therapeutic reverse-thermal solutions with angiogenic agents in concert with a percutaneous transmyocardial revascularization procedure may prove more efficacious than either procedure alone.
  • the localized heating may help start the angiogenic response.
  • the devices described provide for delivery of therapeutic agents to the myocardium of the left ventricle (retrograde access across the aortic valve), the right atrium and ventricle of the heart (venous access), trans-septally from the right to the left side of the heart, from the coronary sinus into the myocardium, or from the coronary artery vessels into the myocardium of the heart.
  • growth factors or antigrowth factors to tissues in the human body.
  • These growth factors can be delivered to influence nerves, blood vessels, tissues, bones, cartilage, muscles, or other cells to grow.
  • Gene therapy preparations can also be delivered. These preparations enable cells to produce the therapeutic proteins that encourage the tissues to grow.
  • Anti-growth proteins have been delivered to discourage growth or to kill tissues that are growing abnormally such as anti-restenosis or antitumor drugs, cytotoxic or chemotherapeutic drugs.
  • the cytotoxic or chemotherapeutic drugs include vincristine, vinblastine, cisplatin, methotrexate, and 5-FU.
  • Gene therapies are being developed to enable the body to make the proteins that limit growth or cause cells to die. All of these therapeutic agents can be formulated into therapeutic solutions.
  • the cooling, heating, or insulating properties of the catheter can also encapsulate the syringe or other pressurized source of therapeutic solution. This would keep the therapeutic solution in its liquid state for a longer period of time. If the therapeutic solution being used were a reverse-thermal solution then it could be insulated it from the heat of the operating room or doctor's body.
  • pressurizing elements to deliver the therapeutic solution to the target area including power injectors, syringe pumps, roller pumps, compressed-gas-powered syringes, in/deflators, and dosing syringes. All of these could be used with the devices and methods described above because they can be joined to the input tube at the luer connector at the proximal end of the catheter.
  • Another embodiment uses electrical, magnetic, radiofrequency, ultrasonic, laser, ultraviolet, or other energy source at the distal end of the catheter to speed the gelling of reverse-thermal solutions after they have been delivered, and the needle flushed of its contents with saline. This is particularly useful in tumor ablation procedures.
  • the additional heat generated by the energy source kills some of the aberrant tumor cells and the delivered reverse-thermal solution continues killing the tumor cells after the acute treatment provided by the energy source.

Abstract

A catheter for injecting a thermally sensitive gelation material to remote sites within a patient's body by maintaining the thermally sensitive gelation material in a liquid state until it is delivered to a target area within the body.

Description

  • This application is a continuation of U.S. application Ser. No. 10/832,040, filed Apr. 26, 2004, now U.S. Pat. No. 7,156,824, which is a continuation of U.S. application Ser. No. 10/308,344 filed Dec. 2, 2002, now U.S. Pat. No. 6,726,654, which is a continuation of U.S. application Ser. No. 09/632,865, filed Aug. 4, 2000, now U.S. Pat. No. 6,488,659, which claims priority to provisional application 60/147,523 filed Aug. 5, 1999.
  • FIELD OF THE INVENTIONS
  • This application relates generally to catheters, and more specifically to catheters and methods for delivering thermally sensitive gelation materials and reverse-thermal gelation materials to remote sites in the body.
  • BACKGROUND OF THE INVENTIONS
  • In many disease states, doctors want to deliver a therapeutic agent to a target area and have the agent remain in the target area to treat the tissue for an extended period of time. If the therapeutic agent has the consistency of liquid, the body quickly and efficiently carries it away from the target area. As a result, the duration of time that the agent has to treat the target area is short.
  • In order to reduce the body's ability to carry the therapeutic agent away from the target area others have increased the viscosity of the therapeutic agent such that it has the consistency of gel. Using gels is effective because the diffusion rates of gels are slower than the diffusion rates of liquids. Thus the gel elutes the therapeutic agent over a longer time course treating the target area for a greater period of time. There are many types of gels that can incorporate therapeutic agents. Each type of gel changes viscosity in response to different environments. Those environments include pH, temperature, catalyst, chemical reaction, solvent, or reaction with compounds in the body.
  • Catheters are traditionally used to deliver therapeutic agents to remote target areas in the body. Generally catheters traverse the vascular pathways of the body until the tip of the catheter reaches the target area. Catheters are used in the cardiovascular, gastric, general, urological, neurological, and oncological fields of medicine. The target area can be a blood vessel, an organ, or a tumor. Catheters have been used to deliver acute therapeutic agents such as analgesic, antibacterial, anti-restenotic, anticancer, anti-inflammatory agents and hormones, and bulking agents such as collagen and stainless steel micro-embolic coils. However, due to the small size and long length of the catheters they cannot deliver viscous materials such as gels to remote sites in the body.
  • One way to circumvent the problem of delivering viscous materials is to use a special class of gels, known as reverse-thermal gelation gels (also known by the trademarked name PLURONIC® gels or TETRONIC® gels, available from BASF and other suppliers). These gels are characterized by the property of being liquid below a critical solution temperature and becoming viscous, or gel-like, above the critical solution temperature. This is in contrast with normal matter that is solid below a critical temperature, for example, the freezing temperature and liquid above that critical temperature, exhibiting decreased viscosity as the temperature of the matter increases. The critical solution temperature of these gels can be tailored by their chemistry such that they are liquid at room temperature or below (0-23° C.) and gel at body temperature (37° C.).
  • There have been many studies of the biological behavior of sustained release of substances from PLURONIC® gels in animals. This gel has typically been delivered to shallow tissue in animals through a syringe. It is possible to deliver it in this manner because the delivery path is short enough that the liquid doesn't gel before it is delivered through the syringe tip because the animal's body heat does not have sufficient time to heat it up.
  • Gels, however, cannot be delivered to remote sites in the body such as the heart or the brain through a catheter because the gels are too viscous to be injected.
  • SUMMARY
  • The devices and methods claimed below allow thermally sensitive gelation materials to be injected into remote sites within a patient's body.
  • The injection catheter includes a hollow needle, a catheter body, a handle, and a syringe. The syringe is located at the proximal end of the injection catheter and the hollow needle is located at the distal end.
  • One embodiment includes a thermally insulated injection catheter that has an insulated catheter body. The insulated catheter body includes a catheter wall, a stainless steel mesh layer, an insulation layer, and a solution tube. The catheter body can also include second tube, called the alternate tube, which extends from the distal to the proximal end of the catheter. This alternate tube joins the solution tube at a Y-junction proximate to the hollow needle.
  • Another embodiment includes a catheter body having a catheter wall, a solution tube, an input tube and an output tube. The input tube surrounds the solution tube and carries a fluid, gas or liquid, along the length of the solution tube for maintaining the therapeutic solution in a liquid state.
  • A further embodiment combines cooling fluid and reverse-thermal solution into one tube by injecting reverse-thermal solution “plugs” separated and carried by the cooling fluid. The plugs move down the tube, pushed by the force of injected saline. Once the discrete plugs are lodged in the target area, the saline would be transported away by the body, leaving the reverse-thermal solution plug in place to harden and elute its therapeutic agent over time.
  • In another embodiment, therapeutic solution is in a reservoir located at the distal end of the catheter. The therapeutic solution is liquefied at a neck section, which is located proximate to the hollow needle that delivers the therapeutic solution. The input tube coils around the neck section and the fluid flows, in the direction of the arrow D, through the input tube liquefying the therapeutic solution, then out the output tube.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is an isometric view of an injection catheter.
  • FIG. 2 is an isometric view of a cross-section of an insulated catheter body.
  • FIG. 3 is an isometric view of a cross-section of a catheter body having a Y-junction.
  • FIG. 4 is an isometric view of a cross-section of a catheter body having an input tube, an output tube, and a solution tube.
  • FIG. 5 is an isometric view of an injection catheter having a fluid input and fluid output.
  • FIG. 6 is an isometric view of a cross-section of a catheter body having an input tube coiled around a solution tube.
  • FIG. 7 is an isometric view of a cross-section of a catheter body having a reservoir, a neck section with a coil.
  • FIG. 8 is an isometric view of an injection catheter in use.
  • FIG. 9 is an isometric view of the distal end of an injection catheter in use in the heart.
  • DETAILED DESCRIPTION OF THE INVENTIONS
  • The devices and methods described below provide for the delivery of controlled-release therapeutic agents to distant locations in the body through small access areas.
  • A therapeutic solution is a thermally sensitive gelling material combined with a therapeutic agent. The term “thermally sensitive gelling material” includes both normal thermal gels and reverse-thermal gels. A thermal gel that works in a patient's body must gel at body temperature and be a liquid at a temperature higher than body temperature. Examples of such materials are collagen and PLA/PLG copolymers. As discussed above, PLURONIC® gel is a reverse-thermal gel that can be used in a patients body.
  • A thermal solution is a combination of a normal thermal gel and a therapeutic agent, and a reverse-thermal solution is a combination of a reverse-thermal gel and a therapeutic agent. The term “solution” is used in its broad sense, and is meant to encompass a solution, a suspension, and any other form of combining a gel with a therapeutic agent.
  • FIG. 1 illustrates an injection catheter 1. The injection catheter includes a hollow needle 2, a catheter body 3, a handle 4, and a syringe 5. The syringe is located at the proximal end of the injection catheter and the hollow needle is located at the distal end. The term hollow needle is meant to encompass any hollow puncturing element. The hollow needle is typically a 27 or 28-gauge needle that is in fluid communication with the syringe. The syringe provides the force for moving the therapeutic solution through the catheter body.
  • The syringe 5 is coupled to the catheter body 3 through a first luer 7 that can be fixed or rotating hemostatic type. The handle 4 advances the catheter body and optionally transmits torque to the catheter body. The catheter body carries the therapeutic solution from the syringe, or other injection device, to a target area within the patient's body.
  • FIG. 2, a preferred embodiment, shows a thermally insulated injection catheter that has an insulated catheter body 10. The insulated catheter body includes a catheter wall 11, a stainless steel mesh layer 12, an insulation layer 13, and a solution tube 14. The catheter wall is typically PEBAX® thermoplastic and is approximately 0.125″ in outside diameter. The solution tube transports the therapeutic solution from the syringe, out of the needle, to the target area. The insulation layer and the stainless steel mesh layer limit the transfer of heat between the patient's body and the therapeutic solution, thus maintaining the therapeutic solution in the liquid state as it travels through the insulated catheter body to the target area.
  • As previously mentioned, the catheter wall 11 is typically PEBAX® resin, and typically 0.118″ in outside diameter and 0.091″ in inside diameter. It may be constructed of varying durometers or flexibilities from proximal to distal end. The durometer ranges for this type of catheter are typically from 75D to 30D. The catheter may be lined with Teflon, PTFE, ETFE, FEP, polyethylene, polypropylene, or FPA to allow the transition from one diameter to another. The stainless steel mesh layer 12 can be stainless steel braiding or coiling which increase torque transmission and elastic bending properties. The diameter of the stainless steel wires typically used in this construction is 0.0025″. The wires may be round or flat. The braiding is typically around 90 picks per inch.
  • The insulation layer 13 is soft material that has low thermal conductivity, such as, closed or open-celled foams of polyurethane, silicone, polyvinyl alcohol or other thermoplastics or thermosetting plastics. Alternatively, the insulation layer can be made up of windings of flat materials that include these foams, thermoplastics, papers, cellulose, and other thermally insulating materials. The winding pattern and stiffness of these materials are designed to allow the catheter to bend easily so that it can negotiate curves in the patient's vasculature to advance to the target area.
  • If the therapeutic solution is a reverse-thermal solution, then the insulation layer 13 could be replaced by a high heat capacity fluid or material. A fluid or material whose critical temperature is near the delivery temperature of the reverse-thermal solution keeps the reverse-thermal solution cool by taking heat away from it. The catheter could be filled with this fluid or material at room temperature or it could be precooled before it was used in the catheter lab. This fluid or material (solid, gel or liquid) is protected from the heat of the circulating blood by the insulating properties of the catheter wall.
  • The solution tube 14 has an outer diameter of typically 0.030″ and the inner diameter is sized to fit over the 27or 28-gauge needle (typically 0.016″ inside diameter). The solution tube material can be silicone, urethane, polyethylene, Teflon, PTFE, ETFE, FEP, FPA, polyolefin, PEO or other thermoplastic that is easily extruded. The solution tube carries the therapeutic solution from the syringe to the hollow needle on the distal end of the catheter. The needle is typically constructed of stainless steel but could be insulated with a thermally insulating material (thermoset or thermoplastic) or made of such a material.
  • FIG. 3 shows a second preferred embodiment which includes a second tube, called the alternate tube 16, extending from the distal to the proximal end of the catheter. The alternate tube joins the solution tube at a Y-junction 17 proximate to the hollow needle 2. The surgeon could inject radiopaque contrast through this tube to better visualize locations in the body. This tube could also be used to flush the distal hollow needle or helix of the therapeutic solution after the solution had been injected into the target area. This would ensure that no therapeutic solution resides in the exposed hollow needle thus reducing the small likelihood that the solution could solidify within the device.
  • When a reverse-thermal solution is used, heated saline could be injected into the alternate tube 16 where the alternate tube is insulated. The heated saline would flush the distal end of the catheter after the reverse-thermal solution had been delivered. Additionally, the heated saline would speed the gelling of the reverse-thermal solution within the target area. In contrast, when a thermal solution is used, cooled saline could be injected into the alternate tube.
  • FIG. 4 shows a third preferred embodiment which includes a catheter body 3 having a catheter wall 11, a solution tube 14, an input tube 18 and an output tube 19. The input tube surrounds the solution tube and carries a fluid, gas or liquid, along the length of the solution tube through the catheter body toward the distal end of the catheter. The output tube surrounds the input tube and carries the fluid away from the distal end of the catheter. The catheter wall surrounds the output tube.
  • An opening 21 at the distal end of the catheter connects the input tube 18 and the output tube 19, such that the fluid flows from the proximal end of the catheter to the distal end of the catheter through the input tube. The fluid then flows in the direction of the arrow A into the output tube. Once in the output tube the fluid flows to the proximal end of the catheter. The distal plug 22 prevents fluid from flowing out of the distal end of the catheter into the patient's body.
  • The fluid is either a heating or a cooling fluid, depending on whether the therapeutic solution is a thermal solution or a reverse-thermal solution. A heating fluid is used if a thermal solution is used, and a cooling fluid is used if a reverse-thermal solution is used. The fluid keeps the therapeutic solution in the liquid state as it travels through the catheter. The fluid convectively cools or heats the therapeutic solution. The term “fluid” is meant in its broad sense, and includes liquids and gases. A compressed gas, such as, nitrogen, carbon dioxide, air, oxygen, helium or other gas can be used as the fluid.
  • FIG. 5 shows the syringe 5, filled with the therapeutic solution in the liquid state, is connected to the catheter body via a first luer 7. Also connected to the catheter body, via a second luer 23, is a fluid source container 24. Further connected to the catheter body, via a third luer 25, is a fluid output container 26. The therapeutic solution flows from the syringe 5 through the catheter body 4 out of the needle 2 into the target area. The fluid flows from the fluid source container 24 into the input tube, through the opening into the output tube and finally into the fluid output container 26.
  • A pump 30 draws up the fluid, which can be water, saline, radiopaque contrast material or a gas etc., from the fluid source container and pressurizes it into the proximal end of the input tube of the catheter. Gravity, a pressurized reservoir, hand pressure or other supply of pressurized fluid can also supply the pressure to move the fluid through the catheter.
  • FIG. 6 shows the input tube 18 being wrapped in a spiral fashion around the solution tube 14 forming a coil 27. Once the coil reaches the distal end of the catheter, it changes direction 180 degrees and becomes the output tube 19 returning the fluid to the proximal end of the catheter and into the fluid output container.
  • In another alternative, there could be an input tube and no output tube or distal plug, such that, a cooling fluid flows out the distal end of the catheter into the body. The cooling fluid in this case could be saline. If the cooling fluid is saline, it can continuously empty into the bloodstream without adverse effects on the patient.
  • The pressure of the fluid carries it out of the catheter and into the fluid output container. When the driving pressure of the fluid is higher than atmospheric pressure, the fluid will flow into the fluid output container, if it is open to the atmosphere. Because of the thermal capacity of the fluid and the volume of fluid flow, the therapeutic solution is kept in the liquid state until it exits the catheter into the target area.
  • One schooled in the art can envision that the pump can be placed on the output-side of the catheter and could develop a vacuum that would draw the fluid through the catheter instead of pushing it from the input-side. The preferred embodiment also includes controllers to change the rate at which the fluid is pumped, the input temperature of the fluid, and thermocouples tied to temperature readouts which monitor the temperature of the therapeutic solution as it exits the catheter into the target area.
  • FIG. 7 shows another preferred embodiment, which includes a reservoir 34 filled with the reverse-thermal solution. The reservoir is located at the distal end of the catheter. The reverse-thermal solution is cooled at a neck section 35, which is located proximate to the hollow needle 2 that delivers the reverse-thermal solution. The input tube 18 coils around the neck section and the fluid flows, in the direction of the arrow D, through the input tube cooling the reverse-thermal solution then out the output tube 19, in the direction of the arrow C. The reservoir has a large, constant cross-section. The cooling of the reverse-thermal solution occurs just proximal to the hollow needle 2 liquefying a small amount of reverse-thermal solution. This small amount of reverse-thermal solution is dispensed by the pressure of the reservoir of reverse-thermal solution in the gelled state which acts like a syringe plunger when pressurized at the proximal end of the catheter. Because the large gel reservoir is of a constant cross-sectional area, it can be forced forward under mild pressure (but not through the small opening of the distal needle).
  • The same configuration could be used wherein the reservoir is filled with the thermal solution. The fluid carried in the input tube heats the neck section thus liquefying the thermal solution in the neck section in order to inject the thermal solution into the target area.
  • Another embodiment combines cooling fluid and reverse-thermal solution into one tube by injecting reverse-thermal solution “plugs” separated and carried by the cooling fluid. The plugs move down the tube, pushed by the force of injected saline. Once the discrete plugs are lodged in the target area, the saline would be transported away by the body, leaving the reverse-thermal solution plug in place to harden and elute its therapeutic agent over time. The proximal end of the device could have a two-position stopcock that either feeds cool saline or cooled saline carrying discrete plugs, depending on which input source is selected by the stopcock position.
  • FIGS. 8 and 9 show the catheter in use. The catheter can, for example, deliver the therapeutic solution to the heart 38, where it slowly releases growth factors to treat coronary artery disease over a period of time. In this instance, the injection catheter is routed through the aortic valve 39 to the left ventricle 40 of the heart inside a hollow guide catheter (not shown) specially shaped for this access. Once the distal end of the catheter is carried to the target site, the needle of the catheter is buried in the wall of the myocardium 41. Then the proximal syringe 5 is depressed to dispense the physician-specified amount of therapeutic solution into the myocardium. The injection catheter is removed from the myocardium and repositioned to another site or removed from the patient's body. The injected therapeutic solution then becomes more viscous under the influence of the body temperature of the patient and thus remains in place to elute its therapeutic agents over a period of time. The therapeutic solution for injection into the heart muscle includes anti-arrythmia agents, angiogenic growth factors, and other agents having therapeutic effects on heart tissue.
  • Implantation of therapeutic reverse-thermal solutions with angiogenic agents in concert with a percutaneous transmyocardial revascularization procedure (PTMR) may prove more efficacious than either procedure alone. The localized heating may help start the angiogenic response.
  • The devices described provide for delivery of therapeutic agents to the myocardium of the left ventricle (retrograde access across the aortic valve), the right atrium and ventricle of the heart (venous access), trans-septally from the right to the left side of the heart, from the coronary sinus into the myocardium, or from the coronary artery vessels into the myocardium of the heart.
  • There has been recent work on the development and delivery of growth factors, or antigrowth factors to tissues in the human body. These growth factors can be delivered to influence nerves, blood vessels, tissues, bones, cartilage, muscles, or other cells to grow. Gene therapy preparations can also be delivered. These preparations enable cells to produce the therapeutic proteins that encourage the tissues to grow. Anti-growth proteins have been delivered to discourage growth or to kill tissues that are growing abnormally such as anti-restenosis or antitumor drugs, cytotoxic or chemotherapeutic drugs. The cytotoxic or chemotherapeutic drugs include vincristine, vinblastine, cisplatin, methotrexate, and 5-FU. Gene therapies are being developed to enable the body to make the proteins that limit growth or cause cells to die. All of these therapeutic agents can be formulated into therapeutic solutions.
  • The cooling, heating, or insulating properties of the catheter can also encapsulate the syringe or other pressurized source of therapeutic solution. This would keep the therapeutic solution in its liquid state for a longer period of time. If the therapeutic solution being used were a reverse-thermal solution then it could be insulated it from the heat of the operating room or doctor's body.
  • There are other pressurizing elements to deliver the therapeutic solution to the target area including power injectors, syringe pumps, roller pumps, compressed-gas-powered syringes, in/deflators, and dosing syringes. All of these could be used with the devices and methods described above because they can be joined to the input tube at the luer connector at the proximal end of the catheter.
  • Features could be added to the catheter to control the depth that the needle tip penetrates the tissue at the target area. Another possible feature is to measure the amount of therapeutic solution that is delivered at the distal end of the catheter.
  • Another embodiment uses electrical, magnetic, radiofrequency, ultrasonic, laser, ultraviolet, or other energy source at the distal end of the catheter to speed the gelling of reverse-thermal solutions after they have been delivered, and the needle flushed of its contents with saline. This is particularly useful in tumor ablation procedures. The additional heat generated by the energy source kills some of the aberrant tumor cells and the delivered reverse-thermal solution continues killing the tumor cells after the acute treatment provided by the energy source.
  • Thus, while the preferred embodiments of the devices and methods have been described in reference to the environment in which they were developed, they are merely illustrative of the principles of the inventions. Other embodiments and configurations may be devised without departing from the spirit of the inventions and the scope of the appended claims.

Claims (2)

1. A method of treating a target area within the body of a patient, said method comprising the steps of:
providing an insulated catheter, said catheter adapted to deliver a reverse thermal solution within the body of the patient;
inserting the insulated catheter into the body of the patient; and
delivering the reverse thermal solution to the target area.
2. The method of claim 2 wherein the step of delivering the reverse thermal solution to the target area comprises delivering the reverse thermal solution to the heart of the patient.
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US10/832,040 US7156824B2 (en) 1999-08-05 2004-04-26 System and method for delivering thermally sensitive and reverse-thermal gelation materials
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US6726654B2 (en) 2004-04-27
US7156824B2 (en) 2007-01-02
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US20040199115A1 (en) 2004-10-07
US20030125665A1 (en) 2003-07-03
AU6519100A (en) 2001-03-05
US6488659B1 (en) 2002-12-03
WO2001010482A9 (en) 2002-09-06

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