US20050240216A1 - Occluding vasculature of a patient using embolic coil with improved platelet adhesion - Google Patents
Occluding vasculature of a patient using embolic coil with improved platelet adhesion Download PDFInfo
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- US20050240216A1 US20050240216A1 US11/168,172 US16817205A US2005240216A1 US 20050240216 A1 US20050240216 A1 US 20050240216A1 US 16817205 A US16817205 A US 16817205A US 2005240216 A1 US2005240216 A1 US 2005240216A1
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- Prior art keywords
- embolic
- microns
- patient
- coils
- embolic coil
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L31/00—Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
- A61L31/14—Materials characterised by their function or physical properties, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/12—Surgical instruments, devices or methods, e.g. tourniquets for ligaturing or otherwise compressing tubular parts of the body, e.g. blood vessels, umbilical cord
- A61B17/12022—Occluding by internal devices, e.g. balloons or releasable wires
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/12—Surgical instruments, devices or methods, e.g. tourniquets for ligaturing or otherwise compressing tubular parts of the body, e.g. blood vessels, umbilical cord
- A61B17/12022—Occluding by internal devices, e.g. balloons or releasable wires
- A61B17/12099—Occluding by internal devices, e.g. balloons or releasable wires characterised by the location of the occluder
- A61B17/12109—Occluding by internal devices, e.g. balloons or releasable wires characterised by the location of the occluder in a blood vessel
- A61B17/12113—Occluding by internal devices, e.g. balloons or releasable wires characterised by the location of the occluder in a blood vessel within an aneurysm
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/12—Surgical instruments, devices or methods, e.g. tourniquets for ligaturing or otherwise compressing tubular parts of the body, e.g. blood vessels, umbilical cord
- A61B17/12022—Occluding by internal devices, e.g. balloons or releasable wires
- A61B17/12131—Occluding by internal devices, e.g. balloons or releasable wires characterised by the type of occluding device
- A61B17/1214—Coils or wires
- A61B17/12145—Coils or wires having a pre-set deployed three-dimensional shape
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L31/00—Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
- A61L31/02—Inorganic materials
- A61L31/022—Metals or alloys
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/0077—Special surfaces of prostheses, e.g. for improving ingrowth
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L2430/00—Materials or treatment for tissue regeneration
- A61L2430/36—Materials or treatment for tissue regeneration for embolization or occlusion, e.g. vaso-occlusive compositions or devices
Definitions
- the present invention concerns a novel method for occluding the vasculature of a patient and, more particularly, a method of treatment in which embolic coils are placed within the patient's vasculature.
- a known technique for treating a brain aneurysm of a patient includes the placement of embolic coils within the aneurysm.
- a catheter is introduced into the vessel leading to the aneurysm, and embolic coils are delivered to pack and fill the aneurysm.
- a deployment system is used to deliver the coils, via the catheter, to the aneurysm, such as the deployment system disclosed in Hieshima U.S. Pat. No. 6,113,622, the disclosure of which is incorporated herein by reference.
- the embolic coils act to reduce the blood flow inside of the aneurysm.
- the embolic coils provide a mechanical blockage to the blood flow in the aneurysm.
- the stagnation of blood prevents the blood flow from rupturing the aneurysm.
- stagnation forms a thrombus inside the aneurysm, that eventually can get resorbed.
- the method that we have discovered is useful for occluding the vasculature of a patient.
- the method of the present invention may also be used for embolizing a vessel for vessel sacrifice; for reducing or blocking blood flow to an arterial-venous malformation or to a fistula; and for blocking blood flow to tumors.
- an object of the present invention to provide a novel method for occluding the vasculature of a patient using implanted embolic coils in which there is improved platelet adhesion to the coils.
- a further object of the present invention to provide a novel method for treating an aneurysm of a patient using implanted embolic coils in which there is improved platelet adhesion to the coils.
- Another object of the present invention is to provide a novel method for treating an aneurysm of a patient using embolic coils and enabling tissue formation to prevent the coils from moving around within the aneurysm.
- a further object of the present invention is to provide a novel embolic coil that is simple in construction and easy to manufacture.
- a still further object of the present invention is to provide a novel embolic coil which provides improved platelet adhesion.
- a method for occluding the vasculature of a patient.
- the method comprises the steps of providing a plurality of embolic coils having a textured surface.
- the plurality of embolic coils having a textured surface are introduced into the patient's vasculature.
- the textured surface provides improved platelet adhesion compared to a non-textured surface, to promote clotting.
- the surface of the embolic coils are textured by abrasion or sandblasting.
- the embolic coil comprises a platinum-tungsten alloy wire and in a specific example, the embolic coils have a substantially uniform roughness comprising pockets having diameters of between about 0.125 microns and about 50 microns and depths between about 0.25 microns to 20 microns.
- FIG. 1 is a view of an embolic coil constructed in accordance with the principles of the present invention.
- FIG. 2 is a diagram of a patient's brain aneurysm having the coils of the present invention implanted therein.
- FIG. 3 is a photomicrograph, enlarged 233 ⁇ , showing a portion of an embolic coil with a smooth surface, prior to texturing.
- FIG. 4 is a photomicrograph, enlarged 233 ⁇ , showing a similar portion of an embolic coil as the FIG. 3 portion, but with texturing.
- FIG. 5 is a photomicrograph, enlarged 3880 ⁇ , showing a portion of an embolic coil with a smooth surface, prior to texturing.
- FIG. 6 is a photomicrograph, enlarged 3880 ⁇ , showing a similar portion of an embolic coil as the FIG. 5 portion, but with texturing
- FIG. 1 there is shown an embolic coil constructed in accordance with the principles of the present invention.
- Embolic coil 10 is formed by winding a platinum-tungsten alloy wire into a helical configuration.
- the diameter of the wire is generally in the range of about 0.0015 to 0.008 inches.
- the outside diameter of the coil 10 is preferably in the range of about 0.006 to 0.055 inches.
- the embolic coil 10 shown in FIG. 1 may be straight or may take the form of various configurations, including the forms of a helix, a random shape configuration, or a coil within a coil configuration.
- the coil is provided with a seal plug 12 at its distal end and another seal plug 14 at its proximal end. Seal plugs 12 and 14 serve to prevent the flow of fluid through the lumen of the coil 10 .
- coil 10 is formed of a platinum-tungsten alloy comprising 92% platinum and 8% tungsten.
- the outer surface of the coil is textured by abrasion or sandblasting. To this end, fifty-micron diameter alumina particles are used to texture the surface of the wire that is used to form the coils, prior to the formation of the helical coils. It has been found that the textured surface provides improved platelet adhesion thus promoting clotting and subsequent endothelialization.
- the texturization provides a uniform roughness comprising pockets having diameters of between about 0.125 microns and about 50 microns and depths of between about 0.25 microns and about 20 microns.
- the roughness is uniform throughout the coil except if the coil is used with a detachment system such as disclosed in Hieshima U.S. Pat. No. 6,113,622 or Diaz et al. U.S. Pat. No. 6,063,100, a proximal portion of the coil is not textured in order for it to have a proper seal with a gripper so that it can released easily.
- FIG. 2 is a diagrammatic view of a patient's vessel 16 leading to an aneurysm 18 into which a number of embolic coils 10 have been introduced.
- the coils are introduced in a manner known in the art, by introducing a catheter into the vessel 16 , then introducing a deployment device via the catheter to deliver the embolic coils, one by one, to the aneurysm 18 .
- FIGS. 3-6 SEM micrographs of the non-textured vs. textured coils are provided in FIGS. 3-6 .
- FIG. 3 a portion of a non-textured coil is shown in a micrograph having an enlargement of 233 ⁇ .
- FIG. 4 shows a similar coil with a 233 ⁇ enlargement, but with texture that has been provided by sandblasting as disclosed above.
- FIG. 5 is a greatly enlarged micrograph, having an enlargement of 3380 ⁇ , of the coil sample of FIG. 3
- FIG. 6 is a greatly enlarged micrograph having an enlargement of 3880 ⁇ , of the coil sample of FIG. 5 .
- embolic coils that have been textured, there is superior platelet adhesion which promotes clotting and subsequent endothelialization.
- a texturing technique has been disclosed that is simple and does not require expensive or elaborate equipment to modify the coils. In the illustrative embodiment the texturing technique does not require coating or ion implantation, thereby avoiding the importation of any new materials to the coil that would require new biocompatability testing.
Abstract
A method as provided for occluding the vasculature of a patient. The method comprises the steps of providing a plurality of embolic coils having a textured surface. The embolic coils are introduced into the patient's vasculature. In this manner, the textured surface provides improved platelet adhesion compared to a non-textured surface, to promote clotting. In the illustrative embodiment, the embolic coil comprises a platinum-tungsten alloy wire and the texturing is performed by abrasion or sandblasting to provide substantially uniform roughness comprising pockets having diameters of about 0.125 microns to about fifty microns and depths of about 0.25 microns to about twenty microns.
Description
- The present invention concerns a novel method for occluding the vasculature of a patient and, more particularly, a method of treatment in which embolic coils are placed within the patient's vasculature.
- A known technique for treating a brain aneurysm of a patient includes the placement of embolic coils within the aneurysm. To this end, a catheter is introduced into the vessel leading to the aneurysm, and embolic coils are delivered to pack and fill the aneurysm. Ordinarily, a deployment system is used to deliver the coils, via the catheter, to the aneurysm, such as the deployment system disclosed in Hieshima U.S. Pat. No. 6,113,622, the disclosure of which is incorporated herein by reference.
- The embolic coils act to reduce the blood flow inside of the aneurysm. Typically the embolic coils provide a mechanical blockage to the blood flow in the aneurysm. In this manner, the stagnation of blood that is obtained prevents the blood flow from rupturing the aneurysm. However, such stagnation forms a thrombus inside the aneurysm, that eventually can get resorbed.
- We have discovered a method by which the desirable mechanical blockage of blood flow can be obtained with the addition of platelet adhesion to the embolic coils. This allows tissue to be able to grow, and the thrombus that forms, instead of being resorbed, has the ability to be organized into fibrous scar tissue. Such fibrous scar tissue achieves long term healing of the aneurysm in contrast to the use of embolic coils that can move around with the result that the formed thrombus may be resorbed
- The method that we have discovered is useful for occluding the vasculature of a patient. In addition to embolizing an aneurysm, the method of the present invention may also be used for embolizing a vessel for vessel sacrifice; for reducing or blocking blood flow to an arterial-venous malformation or to a fistula; and for blocking blood flow to tumors.
- It is, therefore, an object of the present invention to provide a novel method for occluding the vasculature of a patient using implanted embolic coils in which there is improved platelet adhesion to the coils.
- A further object of the present invention to provide a novel method for treating an aneurysm of a patient using implanted embolic coils in which there is improved platelet adhesion to the coils.
- Another object of the present invention is to provide a novel method for treating an aneurysm of a patient using embolic coils and enabling tissue formation to prevent the coils from moving around within the aneurysm.
- A further object of the present invention is to provide a novel embolic coil that is simple in construction and easy to manufacture.
- A still further object of the present invention is to provide a novel embolic coil which provides improved platelet adhesion.
- Other objects and advantages of the present invention will become apparent as the description proceeds.
- In accordance with the present invention, a method is provided for occluding the vasculature of a patient. The method comprises the steps of providing a plurality of embolic coils having a textured surface. The plurality of embolic coils having a textured surface are introduced into the patient's vasculature. In this manner, the textured surface provides improved platelet adhesion compared to a non-textured surface, to promote clotting.
- In the illustrative embodiment, the surface of the embolic coils are textured by abrasion or sandblasting. The embolic coil comprises a platinum-tungsten alloy wire and in a specific example, the embolic coils have a substantially uniform roughness comprising pockets having diameters of between about 0.125 microns and about 50 microns and depths between about 0.25 microns to 20 microns.
- A more detailed explanation of the invention is provided in the following description and claims, and is illustrated in the accompanying drawings.
-
FIG. 1 is a view of an embolic coil constructed in accordance with the principles of the present invention. -
FIG. 2 is a diagram of a patient's brain aneurysm having the coils of the present invention implanted therein. -
FIG. 3 is a photomicrograph, enlarged 233×, showing a portion of an embolic coil with a smooth surface, prior to texturing. -
FIG. 4 is a photomicrograph, enlarged 233×, showing a similar portion of an embolic coil as theFIG. 3 portion, but with texturing. -
FIG. 5 is a photomicrograph, enlarged 3880×, showing a portion of an embolic coil with a smooth surface, prior to texturing. -
FIG. 6 is a photomicrograph, enlarged 3880×, showing a similar portion of an embolic coil as theFIG. 5 portion, but with texturing - Referring to the drawings, in
FIG. 1 there is shown an embolic coil constructed in accordance with the principles of the present invention.Embolic coil 10 is formed by winding a platinum-tungsten alloy wire into a helical configuration. In the illustrative embodiment, the diameter of the wire is generally in the range of about 0.0015 to 0.008 inches. The outside diameter of thecoil 10 is preferably in the range of about 0.006 to 0.055 inches. Theembolic coil 10 shown inFIG. 1 may be straight or may take the form of various configurations, including the forms of a helix, a random shape configuration, or a coil within a coil configuration. - The details of construction of an example embolic coil, although no limitation is intended, is disclosed in Diaz et al. U.S. Pat. No. 6,063,100, issued May 16, 2000, the disclosure of which is incorporated herein by reference.
- With the helical wound coil as illustrated in FIG, 1 the coil is provided with a
seal plug 12 at its distal end and anotherseal plug 14 at its proximal end.Seal plugs coil 10. - Although no limitation is intended, as a
specific example coil 10 is formed of a platinum-tungsten alloy comprising 92% platinum and 8% tungsten. In accordance with the present invention, the outer surface of the coil is textured by abrasion or sandblasting. To this end, fifty-micron diameter alumina particles are used to texture the surface of the wire that is used to form the coils, prior to the formation of the helical coils. It has been found that the textured surface provides improved platelet adhesion thus promoting clotting and subsequent endothelialization. - Although no limitation is intended, as a specific example the texturization provides a uniform roughness comprising pockets having diameters of between about 0.125 microns and about 50 microns and depths of between about 0.25 microns and about 20 microns. The roughness is uniform throughout the coil except if the coil is used with a detachment system such as disclosed in Hieshima U.S. Pat. No. 6,113,622 or Diaz et al. U.S. Pat. No. 6,063,100, a proximal portion of the coil is not textured in order for it to have a proper seal with a gripper so that it can released easily.
-
FIG. 2 is a diagrammatic view of a patient'svessel 16 leading to ananeurysm 18 into which a number ofembolic coils 10 have been introduced. The coils are introduced in a manner known in the art, by introducing a catheter into thevessel 16, then introducing a deployment device via the catheter to deliver the embolic coils, one by one, to theaneurysm 18. - SEM micrographs of the non-textured vs. textured coils are provided in
FIGS. 3-6 . Referring toFIG. 3 , a portion of a non-textured coil is shown in a micrograph having an enlargement of 233×.FIG. 4 shows a similar coil with a 233× enlargement, but with texture that has been provided by sandblasting as disclosed above.FIG. 5 is a greatly enlarged micrograph, having an enlargement of 3380×, of the coil sample ofFIG. 3 andFIG. 6 is a greatly enlarged micrograph having an enlargement of 3880×, of the coil sample ofFIG. 5 . - Testing was conducted using radiolabeled platelets to evaluate an ex vivo aneurysm model. In the model, aneurysms treated with textured coils were compared to aneurysms treated with non-textured coils. The textured coils showed an increased in the platelet deposition of about fifty percent over the non-texture coils.
- It can be seen that by using embolic coils that have been textured, there is superior platelet adhesion which promotes clotting and subsequent endothelialization. A texturing technique has been disclosed that is simple and does not require expensive or elaborate equipment to modify the coils. In the illustrative embodiment the texturing technique does not require coating or ion implantation, thereby avoiding the importation of any new materials to the coil that would require new biocompatability testing.
- Although an illustrative embodiment of the invention has been shown and described, it is to be understood that various modifications and substitutions may be made by those skilled in the art without departing from the novel spirit and scope of the present invention.
Claims (20)
1. A method for occluding the vasculature of a patient, comprising the steps of:
providing a plurality of embolic coils having a textured surface;
introducing said plurality of embolic coils into the patient's vasculature, whereby the textured surface provides improved platelet adhesion compared to a non-textured surface, to promote clotting.
2. A method as defined in claim 1 , including the step of texturing the surface of an embolic coil by abrasion.
3. A method as defined in claim 1 , including the step of texturing the surface of an embolic coil by sandblasting.
4. A method as defined in claim 1 , in which said embolic coil comprises a platinum-tungsten alloy wire.
5. A method as defined in claim 1 , in which said embolic coil includes a proximal portion and a distal portion; said proximal portion being relatively smooth and said distal portion being relatively textured.
6. A method as defined in claim 1 , in which said embolic coil has substantially uniform roughness comprises pockets having diameters between about 0.125 microns and about 50 microns.
7. A method as defined in claim 6 , in which said pockets have depths of between about 0.25 microns and about 20 microns.
8. A method as defined in claim 1 , in which the embolic coils are used to embolize a vessel for vessel sacrifice.
9. A method as defined in claim 1 , in which the embolic coils are used to reduce or block blood flow to an arterial-venous malformation or to a fistula.
10. A method as defined in claim 1 , in which the embolic coils are used to block blood flow to tumor.
11. A method for treating an aneurysm of a patient, comprising the steps of:
providing a plurality of embolic coils having a textured surface;
introducing said plurality of embolic coils into the patient's aneurysm, whereby the textured surface provides improved platelet adhesion compared to a non-textured surface, to promote clotting.
12. A method as defined in claim including the step of texturing the surface of an embolic coil by abrasion.
13. A method as defined in claim 11 , including the step of texturing the surface of an embolic coil by sandblasting.
14. A method as defined in claim 11 , in which said embolic coil comprises a platinum-tungsten alloy wire.
15. A method as defined in claim 11 , in which said embolic coil includes a proximal portion and a distal portion; said proximal portion being relatively smooth and said distal portion being relatively textured.
16. A method as defined in claim 11 , in which said embolic coil has substantially uniform roughness comprises pockets having diameters between about 0.125 microns and about 50 microns.
17. A method as defined in claim 11 , in which said pockets have depths of between about 0.25 microns and about 20 microns.
18. A method for occluding the vasculature of a patient, comprising the steps of:
providing a plurality of embolic coils formed of a platinum-tungsten alloy;
texturizing the surface of said embolic coils by abrasion or sandblasting;
introducing said plurality of textured embolic coils into the patient's vasculature, whereby the textured surface provides improved platelet adhesion compared to a non-textured surface, to promote clotting.
19. A method as defined in claim 18 , in which said embolic coils have substantially uniform roughness comprising pockets having diameters of between about 0.125 microns and about 50 microns and depths of between about 0.25 microns and about 20 microns.
20. A embolic coil formed of a platinum alloy wire and having a textured surface which, when said embolic coil is implanted in a patient's vasculature, provides improved platelet adhesion compared to a non-textured surface, to promote clotting.
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US11/168,172 US20050240216A1 (en) | 2001-06-13 | 2005-06-28 | Occluding vasculature of a patient using embolic coil with improved platelet adhesion |
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US09/880,506 US6953468B2 (en) | 2001-06-13 | 2001-06-13 | Occluding vasculature of a patient using embolic coil with improved platelet adhesion |
US11/168,172 US20050240216A1 (en) | 2001-06-13 | 2005-06-28 | Occluding vasculature of a patient using embolic coil with improved platelet adhesion |
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US09/880,506 Division US6953468B2 (en) | 2001-06-13 | 2001-06-13 | Occluding vasculature of a patient using embolic coil with improved platelet adhesion |
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US09/880,506 Expired - Lifetime US6953468B2 (en) | 2001-06-13 | 2001-06-13 | Occluding vasculature of a patient using embolic coil with improved platelet adhesion |
US11/168,172 Abandoned US20050240216A1 (en) | 2001-06-13 | 2005-06-28 | Occluding vasculature of a patient using embolic coil with improved platelet adhesion |
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US (2) | US6953468B2 (en) |
EP (1) | EP1266631B1 (en) |
JP (1) | JP4236871B2 (en) |
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CN112754583A (en) * | 2020-12-31 | 2021-05-07 | 微创神通医疗科技(上海)有限公司 | Spring ring and preparation method thereof |
Also Published As
Publication number | Publication date |
---|---|
DE60219995D1 (en) | 2007-06-21 |
EP1266631A1 (en) | 2002-12-18 |
US6953468B2 (en) | 2005-10-11 |
ATE361703T1 (en) | 2007-06-15 |
JP4236871B2 (en) | 2009-03-11 |
EP1266631B1 (en) | 2007-05-09 |
JP2003070794A (en) | 2003-03-11 |
US20030004531A1 (en) | 2003-01-02 |
DE60219995T2 (en) | 2008-01-17 |
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