US20020138094A1 - Vascular filter system - Google Patents

Vascular filter system Download PDF

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Publication number
US20020138094A1
US20020138094A1 US10/045,296 US4529601A US2002138094A1 US 20020138094 A1 US20020138094 A1 US 20020138094A1 US 4529601 A US4529601 A US 4529601A US 2002138094 A1 US2002138094 A1 US 2002138094A1
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United States
Prior art keywords
filter
filter membrane
proximal
distal
guidewire
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
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US10/045,296
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English (en)
Inventor
Thomas Borillo
Mark Maciejewski
Gregg Sutton
Jeffrey Welch
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Cordis US Corp
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Individual
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Filing date
Publication date
Priority claimed from US09/249,377 external-priority patent/US6391044B1/en
Application filed by Individual filed Critical Individual
Priority to US10/045,296 priority Critical patent/US20020138094A1/en
Assigned to CORDIS CORPORATION reassignment CORDIS CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WELCH, JEFFREY, SUTTON, GREGG S., BORILLO, THOMAS, MACIEJEWSKI, MARK
Priority to US10/198,670 priority patent/US7399308B2/en
Publication of US20020138094A1 publication Critical patent/US20020138094A1/en
Priority to AU2002301808A priority patent/AU2002301808B2/en
Priority to MXPA02010930A priority patent/MXPA02010930A/es
Priority to AT02257674T priority patent/ATE349971T1/de
Priority to ES02257674T priority patent/ES2278880T3/es
Priority to CA002411229A priority patent/CA2411229C/en
Priority to ARP020104237A priority patent/AR037262A1/es
Priority to DE60217264T priority patent/DE60217264T2/de
Priority to EP02257674A priority patent/EP1310219B1/de
Priority to JP2002322806A priority patent/JP4387092B2/ja
Priority to BRPI0206890-7A priority patent/BR0206890B1/pt
Assigned to CORDIS US CORP reassignment CORDIS US CORP ASSIGNMENT OF ASSIGNOR'S INTEREST Assignors: CARDINAL HEALTH 529, LLC, CARDINAL HEALTH SWITZERLAND 515 GmbH, CORDIS CORPORATION, FLEXIBLE STENTING SOLUTIONS, INC
Abandoned legal-status Critical Current

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    • 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
    • A61F2/01—Filters implantable into blood vessels
    • A61F2/013—Distal protection devices, i.e. devices placed distally in combination with another endovascular procedure, e.g. angioplasty or stenting
    • 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
    • A61F2/01—Filters implantable into blood vessels
    • A61F2/011—Instruments for their placement or removal
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/22—Implements for squeezing-off ulcers or the like on inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; for invasive removal or destruction of calculus using mechanical vibrations; for removing obstructions in blood vessels, not otherwise provided for
    • 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
    • A61F2/01—Filters implantable into blood vessels
    • A61F2002/016—Filters implantable into blood vessels made from wire-like elements
    • 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
    • A61F2/01—Filters implantable into blood vessels
    • A61F2002/018—Filters implantable into blood vessels made from tubes or sheets of material, e.g. by etching or laser-cutting
    • 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
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0004—Rounded shapes, e.g. with rounded corners
    • A61F2230/0006—Rounded shapes, e.g. with rounded corners circular
    • 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
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0063—Three-dimensional shapes
    • A61F2230/0067—Three-dimensional shapes conical
    • 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
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0063—Three-dimensional shapes
    • A61F2230/0071—Three-dimensional shapes spherical
    • 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
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0063—Three-dimensional shapes
    • A61F2230/0073—Quadric-shaped
    • A61F2230/008—Quadric-shaped paraboloidal
    • 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
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0063—Three-dimensional shapes
    • A61F2230/0093—Umbrella-shaped, e.g. mushroom-shaped
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES 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
    • A61M25/00—Catheters; Hollow probes
    • A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
    • A61M25/09—Guide wires
    • A61M2025/09125—Device for locking a guide wire in a fixed position with respect to the catheter or the human body

Definitions

  • the present invention relates to the treatment of vascular disease by either percutaneous angioplasty and stenting or surgery. More particularly, the present invention relates to a system that reduces macro- and micro-embolization during the treatment of vascular disease.
  • Balloon angioplasty utilizes a balloon-tipped catheter which may be inserted within a stenosed region of the blood vessel. By inflation of the balloon, the stenosed region is dilated. Stenting involves the permanent implantation of a metallic scaffold in the area of the obstruction, following balloon dilatation. The stent is often delivered on an angioplasty balloon, and is deployed when the balloon is inflated. Another alternative is the local delivery of medication via an infusion catheter. Other techniques, such as atherectomy, have also been proposed. In atherectomy, a rotating blade is used to shave plaque from an arterial wall. Finally, other techniques such as tissue ablation are sometimes performed to address electrical anomalies in heart rhythm. Surgery involves either removing the plaque from the artery or attaching a graft to the artery so as to bypass the obstructing plaque.
  • emboli which can lodge elsewhere in the vascular system.
  • emboli may be dangerous to the patient, and may cause severe impairment of the distal circulatory bed. Depending upon the vessel being treated, this may result in a stroke or myocardial infarction or limb ischemia.
  • Vascular filters or embolism traps for implantation into the vena cava of a patient are well known, being illustrated by, for example, U.S. Pat. Nos. 4,727,873 and 4,688,533. Additionally, there is a substantial amount of medical literature describing various designs of vascular filters and reporting the results of the clinical and experimented use thereof. See, for example, the article by Eichelter & Schenk entitled “Prophylaxis of Pulmonary Embolism,” Archives of Surgery, Vol. 97, August 1968, pp. 348 et seq. See, also, the article by Greenfiled, et al., entitled “A New Intracaval Filter Permitting Continued Flow and Resolution of Emboli”, Surgery, Vol. 73, No. 4, pp. 599-606 (1973).
  • Vascular filters are used, often during a postoperative period, when there is a perceived risk of a patient encountering a pulmonary embolus resulting from clots generated at the surgical site.
  • the filter is mounted in the vena cava to catch large emboli passing from the surgical site to the lungs.
  • vascular filters of the prior art are usually permanently implanted in the venous system of the patient, so that even after the need for the filter has abated, the filter remains in place for the lifetime of the patient, absent surgical removal.
  • U.S. Pat. No. 3,952,747 describes a stainless steel filtering device which is permanently implanted transvenously within the inferior vena cava. The filtering device is intended to treat recurrent pulmonary embolism.
  • U.S. Pat. No. 4,873,978 describes a catheter device comprising a catheter body having a strainer mounted at its distal end.
  • the strainer is shiftable between an opened configuration where it extends substantially across the blood vessel to entrap passing emboli, and a closed configuration where it retains the captured emboli during removal of the catheter.
  • a mechanism actuable at the proximate end of the catheter body allows selective opening and closing of the strainer.
  • the strainer is a collapsible cone having an apex attached to a wire running from the distal end to the proximate end of the catheter body.
  • Permanent implantation may be deemed medially undesirable, but it has been done because vascular filters are implanted in patients primarily in response to potentially life threatening situations. Accordingly, the potential disadvantages of permanent implantations of a vascular filter are often accepted.
  • the present invention provides a vascular filter system useful in the surgical or interventional treatment of vascular disease.
  • Macro- and micro-embolization may occur during percutaneous procedures such as angioplasty, which increases the risk of a minor or major stroke.
  • the system of the present invention for reducing macro- and micro-embolization is very useful in helping to prevent the risk of stroke.
  • this system would also be useful in any percutaneous angioplasty, stenting, thrombolysis or tissue ablation procedure, or surgical procedure where embolization is a risk.
  • the vascular filter system of the present invention may decrease embolism while allowing brain, or other distal tissue, perfusion.
  • the filters may be incorporated into a guidewire which is used for the entire procedure from crossing a lesion to deploying a stent.
  • An objective of the present invention is to provide a vascular filter system for reducing macro- and micro-embolization. Another objective of the present invention is to provide a vascular filter system which is readily removable from the vascular system, or elsewhere, of a patient when the filter is no longer needed. It is a further objective of the present invention to provide a vascular filter system having a configuration which does not require hooks to penetrate and grip the blood vessel walls, so that the implantation results in less blood vessel injury. It is yet a further objective of the present invention to provide a vascular filter system of very low profile which is part of a guidewire and may be used in small vessels. It is yet a further objective of the invention to provide a vascular filter system for angioplasty, stenting, thrombolysis and/or electrophysiologic or other ablative procedures.
  • the filter comprises a thin membrane attached to the guidewire and supported by fine metal spines. Attachment of the filter membrane to the guidewire allows expansion of the filter membrane with a firm fit inside the artery. The attachment also allows for collapse of the filter membrane at the end of the procedure so it fits tightly against the guidewire and can be withdrawn through the guide catheter.
  • the filter membrane rests upon or is attached to a basket-like structure, at least one end of which is attached to the guidewire.
  • the filter membrane has a pore size such that blood flow is not impeded when the filter membrane is expanded but micro- and macro-emboli are blocked. Expansion of the filter membrane is aided by the forward flow of blood against the filter.
  • the filter design results in a very low profile so that the initial crossing of the lesion is minimally traumatic. Also, the small diameter and small profile facilitate use of the device in small or larger arteries with minimal or no obstruction of blood flow.
  • a dilatation balloon delivery system incorporating a vascular filter may be useful to capture thrombus or emboli generated during a cardiovascular procedure.
  • the dilatation balloon delivery system comprises a balloon catheter having proximal and distal ends, the proximal end comprising a hub having ports.
  • the distal end comprises an inflatable balloon having a distal end, where a guidewire lumen extends from the distal end of the balloon to one of the ports in the hub.
  • the guidewire also extends distally to a vascular filter system.
  • a sheath is arranged concentric to the balloon catheter, where the distal end of the sheath covers the inflatable balloon and the guidewire filter.
  • the sheath proximal end extends to a point distal to the hub.
  • a stent delivery system incorporating a vascular filter may be useful to capture thrombus or emboli generated during a cardiovascular procedure.
  • the stent delivery system comprises a balloon catheter having proximal and distal ends, the proximal end comprising a hub having ports.
  • the distal end comprises an inflatable balloon having a distal end, where a guidewire lumen extends from the distal end of the balloon to one of the ports in the hub.
  • the guidewire lumen also extends proximally to a vascular filter system.
  • An expandable stent is positioned annularly around the balloon.
  • a sheath is arranged concentric to the balloon catheter, where the distal end of the sheath covers the inflatable balloon, the stent, and the guidewire filter.
  • the sheath proximal end extends to a point distal to the hub.
  • the vascular filter is attached to a guidewire having an infusion catheter with infusion holes for controlled delivery and distribution of medication to the area of surgical intervention.
  • the sheath over the guidewire may control the area of distribution of the medication by controlling the number of the revealed infusion holes in the infusion catheter.
  • a locking mechanism on the proximal end of the apparatus may assure that the sheath does not reveal a larger than necessary area of the angioplasty, i.e., thrombus, to be exposed to the infusion holes.
  • a vascular filter system may be used to capture thrombus or emboli generated during electrophysiology or another ablative procedure.
  • a guidewire-based collapsible filter basket can be advanced through the femoral artery to a position adjacent the left ventricle. The basket faces the ventricle, and then the basket is collapsed and withdrawn proximally.
  • a guiding catheter has a distally-extending filter membrane that may be collapsed, for example, by sliding an outer sheath distally.
  • An advantage of the present invention is that it provides the benefits of filtration and capture of embolic particulates, temporarily, during a variety of clinical procedures.
  • FIG. 1 illustrates a lateral, partial cross-sectional view of one exemplary embodiment of the present invention with the filter membrane in an open position.
  • FIG. 2 illustrates a lateral, partial cross-sectional view of the exemplary embodiment of the present invention in FIG. 1 with the sheath closed.
  • FIG. 3 illustrates a schematic representation of a portion of a filter membrane in accordance with the present invention.
  • FIG. 4 illustrates a lateral view of a core wire in accordance with the present invention.
  • FIG. 5 illustrates a cross-sectional view across section line 5 - 5 of a portion of the core wire of FIG. 4.
  • FIG. 6 illustrates a lateral, cross-sectional view of an alternate basket structure for the exemplary embodiment of FIG. 1.
  • FIG. 7 illustrates a lateral, partial cross-sectional view of another exemplary embodiment of the present invention.
  • FIG. 8 illustrates a lateral, partial cross-sectional view of a further exemplary embodiment of the present invention.
  • FIG. 9 illustrates a schematic, partial cross-sectional view of another exemplary embodiment of the present invention where the distal section of the filter basket is inverted.
  • FIG. 10 illustrates a schematic, partial cross-sectional view of the exemplary embodiment shown in FIG. 9 where the filter basket is collapsed.
  • FIG. 11 illustrates a lateral, partial cross-sectional view of one exemplary embodiment of the invention with the filter membrane in an open position and guidewire having infusion holes.
  • FIG. 12 illustrates a schematic, partial cross-sectional view, with an enlarged section, of an exemplary embodiment of the present invention wherein a dilatation delivery system comprises a vascular filter.
  • FIG. 13 illustrates a schematic, partial cross-sectional view of an exemplary embodiment of the present invention wherein a stent delivery system comprises a vascular filter.
  • FIG. 14 illustrates a schematic, partial cross-sectional view of an electrophysiology filter system according to the present invention.
  • FIG. 15 illustrates a schematic, partial cross-sectional view of a filter apparatus in accordance with the present invention.
  • FIG. 16 illustrates a schematic, partial cross-sectional view of a guide catheter filter system according to the present invention.
  • FIG. 17 illustrates a partial view of an ablation catheter in accordance with the present invention.
  • the present invention relates to a vascular filter system for use in percutaneous angioplasty and stenting and provides for the prevention of distal embolism during endovascular procedures. Further, the filter system of the present invention allows for distal perfusion while preventing embolization.
  • the system comprises a thin, perforated filter membrane which is capable of blocking emboli and which is attached to the distal end of a guidewire.
  • a thin, flexible, perforated membrane is supported by four or more supports that form a distally extending basket. At least one end of the basket is attached to the guidewire, and the other, slidable end may be moved to cause the membrane to open or close.
  • FIG. 1 illustrates a lateral, cross-sectional view of a distal end of a guidewire 160 with a filter membrane 170 attached thereto.
  • FIG. 1 shows guidewire 160 with a shapeable soft “floppy” tip 162 at its extreme distal end which provides flexibility and maneuverability to guidewire 160 .
  • the filter membrane in FIG. 1 is illustrated in an open position.
  • Guidewire 160 comprises a core wire 164 , which extends into floppy tip 162 , and a sheath 166 .
  • Filter membrane 170 is supported by a basket 169 comprising two or more filter basket wires 168 , having distal ends 172 and proximal ends 174 .
  • the distal ends 172 of basket wires 168 are fixedly attached by distal radiopaque marker or crimp band 176 to core wire 164
  • the proximal ends 174 of basket wires 168 are attached to proximal radiopaque marker or crimp band 178 , which is slidable over core wire 164 , optionally with a polymeric, such as polyimide, or metallic sleeve between core wire 164 and proximal ends 174
  • proximal marker 178 is fixedly attached to core wire 164
  • distal marker 176 with a polymeric or metallic sleeve, is slidable over core wire 164 .
  • the flow of blood in FIG. 1 is toward the distal end of guidewire 160 . As such, the force of the flow of blood pushes on deployed filter membrane 170 and helps to maintain filter membrane 170 in the deployed position.
  • a sheath member 180 is attached to the distal end of sheath 166 , sheath member 180 having a lumen 182 with a diameter and length sufficient to receive or slide over proximal marker 178 .
  • Sheath 166 and sheath member 180 can be either separate pieces bonded together or a continuous, integral structure.
  • Sheath 166 and sheath member 180 are each made from low friction polymeric material, preferably polytetrafluoroethylene, polyethylene, nylon, or polyurethane.
  • Filter membrane 170 may comprise a number of different non-metallic permeable membranes having sufficient porosity to facilitate blood flow but having sufficiently small openings to capture emboli.
  • Filter membrane 170 is preferably affixed at least at its distal portion 184 to core wire 164 and/or basket wire distal ends 172 and, optionally, to basket wires 168 .
  • the remainder of filter membrane 170 may be unattached or, preferably, attached to basket wires 168 , such as by a suitable adhesive.
  • basket wires 168 are encapsulated in membrane 170 .
  • Basket 169 may be somewhat cylindrical in its middle with tapered, conical, proximal and distal portions. Alternately, basket 169 may be slightly spherical, optionally with a flat, cylindrical middle portion. Preferably basket 169 is from about five to about forty mm in length and from about two to about thirty mm, or from about two to about twenty mm, in diameter at its widest.
  • Control handle 186 has an opening 188 for core wire 164 so that sheath 180 can move slidably over core wire 164 .
  • core wire 164 For example, when sheath 180 is moved distally toward basket wires 168 , filter membrane 170 collapses. Also, there may be instances where sheath 180 will be removed proximally so that other catheters or cardiovascular appliances can be introduced over core wire 164 .
  • Control handle 186 which functions as a torque device, also primarily functions to lock sheath 180 to core wire 164 during insertion.
  • control handle 186 There are a number of known, commercially available guidewire torquers that may be modified to function as control handle 186 . Modification includes, but is not limited to, providing a slightly larger central lumen.
  • sheath 166 and sheath member 180 are shown advanced distally so that basket wires 168 and filter member 170 are collapsed against core wire 164 .
  • the distal end 192 of sheath member 180 may optionally be slightly tapered to provide a better profile for insertion.
  • filter membrane 170 comprises a polymeric material such as polyurethane or silicone elastomer that has laser-drilled holes 190 .
  • the filter membrane may comprise fabric or non-fabric meshes, such as those used in known hemodialysis filters or heart-lung bypass machine filters. Suitable materials include polymers or physiologically acceptable metals or alloys.
  • Such holes 190 are preferably only on the conical portion of filter membrane 170 .
  • the holes 190 could be from about twenty to about three hundred microns in diameter.
  • the vertical row separation of holes 190 may be from about 1.2 to 1.4 times the hole diameter and the center-to-center diameter of holes 190 may be from about 1.4 to 1.6 times the hole diameter, or in an exemplary embodiment the vertical and horizontal spacing of the holes is such that the center-to-center spacing of the holes is from about 1.2 to 2.0 times the hole diameter.
  • the open area of the holes represents from about ten to fifty percent, more preferably from about ten to forty percent of the filter surface.
  • the hole size may be variable.
  • the mesh should have pores of a size sufficient to block and capture any micro- and macro-emboli which may flow downstream from the site where the stenosis is being treated, but large enough such that blood flow is not impeded.
  • the mesh used in the filter device of the invention can have a pore size of from about twenty to about three hundred microns, preferably from about fifty to about one hundred fifty microns.
  • the size of filter membrane 170 is such as to allow a firm fit between filter membrane 170 and an artery wall (not shown).
  • the diameter of filter membrane 170 will be directly related to the artery being treated, with typical diameters ranging from about two mm to about forty mm, most preferably from about two mm to about twenty mm.
  • Basket wires 168 may comprise a suitable, physiologically acceptable metal. Stainless steel or nitinol are preferred, although titanium or other metal alloys could be used.
  • Core wire 164 can be seen better in FIG. 4, where the proximal and middle portions 200 and 202 are substantially uniform in diameter, and then the distal portion 204 tapers to an end point 206 .
  • distal portion 204 could taper uniformly or, more preferably, non-uniformly, as shown in FIG. 4.
  • core wire 164 is from about two hundred fifty to three hundred cm in length, with an initial diameter of from about 0.009 to 0.038 inches, preferably from about 0.014 to 0.018 inches
  • Distal section 204 is typically from about eight to ten cm.
  • Core wire 164 may optionally have a thin polymeric coating 207 for friction reduction.
  • end point 206 is a solid, squat cylinder, as shown in FIGS. 4 and 5.
  • Floppy tip 162 preferably comprises a radiopaque helical spring 210 that is fixedly attached, e.g., by welding, brazing, or soldering, to end point 206 and, optionally, attachment point 208 .
  • spring coil 210 may have a polymeric or lubricious coating 212 .
  • FIG. 6 represents an alternate design where basket wires 220 are substantially helical in shape.
  • Filter member 222 covers or encompasses the distal portion of basket wires 220 , and the proximal and distal portions of basket wires 220 are secured by proximal radiopaque marker or crimp band 224 and distal radiopaque marker or crimp band 226 , respectively.
  • Markers 224 and 226 are fixed or slidable on core wire 228 as described above.
  • FIGS. 7 and 8 Additional exemplary embodiments of the present invention can be seen in FIGS. 7 and 8.
  • the schematic representation in FIG. 7 depicts a filter membrane 280 supported by strut wires 282 .
  • the distal ends 284 of strut wires 282 are attached to the distal portion of a tubular member 286 .
  • a movable core wire 290 extends through a lumen 292 in tubular member 286 to a distal floppy section 294 , where a helical spring coil 296 surrounds the distal portion 298 of core wire 290 and is attached to end point 300 .
  • attachment point 302 of weld or solder at the proximal portion of spring coil 296 where the distal portion 304 of sheath member 306 is also attached to core wire 290 .
  • the lumen 308 of sheath member 306 is large enough so that as core wire 290 is pulled proximally, or tubular member 286 is advanced distally, the distal ends 284 of strut wires 282 move into lumen 308 and collapse filter membrane 280 .
  • Moveable core wire 250 of the structure shown in FIG. 8 comprises a floppy tip 252 where a helical spring coil 254 encompasses the distal portion 256 of core wire 250 .
  • a basket wire structure component of two or more basket wires 258 supports a filter membrane 260 on the distal portion 262 of the basket structure. Distal ends 264 of the basket wires 258 are encompassed by a radiopaque marker or crimp band 266 that is attached to core wire 250 and/or spring coil 254 .
  • the proximal ends 268 of basket wires 258 are attached to the distal portion of a sheath 270 that surrounds core wire 250 . Sheath 270 moves slidably over core wire 250 so that when sheath 270 is pulled proximally into core wire 250 , filter membrane 250 collapses.
  • a basket 320 comprising from four to eight strut wires 322 is secured by a distal fixed grommet 324 and a proximal slidable grommet 326 .
  • Grommet 326 is slidable over core wire 328 .
  • Filter membrane 330 is attached to or arranged upon basket 320 , with the proximal section 332 of the membrane 290 being open to flow, represented by arrows 334 .
  • the distal portion 336 of membrane 330 forms a conical shape 340 that extends proximally.
  • the filter could be deployed by, for example, a sheath or a tube fixed to the proximal slidable crimp band 336 .
  • This design is optimized for perfusion and emboli collection. For example, as more emboli is collected, it tends to collect in outer, non-filter areas, leaving the pores open for perfusion.
  • Membrane 330 preferably has holes only in distal section 336 / 340 , which holes are arranged as described above. It is believed that under normal, substantially laminar flow conditions debris or emboli 342 will tend to collect in annular recesses 344 .
  • slidable grommet 326 is moved proximally to collapse basket 320 and membrane 336 . This can be accomplished with, for example, sheath 350 or a fixed tubular member or other apparatus that is preferably slidable over the core wire.
  • a guidewire or rigid infusion tubing 360 extends over a core wire 362 that extends to a floppy tip 364 , and a filter membrane 366 is supported by a filer basket 368 .
  • Tubing 360 extends distally to hub 372 .
  • Core wire 362 extends through a lumen in tubing 360 and proximal to hub 372 .
  • Hub 372 has a Luer fitting 374 .
  • Filter membrane 366 supported by filter basket 368 comprises two or more filter basket wires 376 , having distal ends 378 and proximal ends 380 attached to core wire 362 and operating in a manner described above in conjunction with the description of FIGS. 1 - 3 .
  • the infusion rigid tubing 360 may have infusion holes 370 for delivering and distributing medication through infusion holes 370 as well as through the infusion tubing end 382 to an afflicted target area of a procedure such as a peripheral thrombolysis.
  • a sheath 390 is connected to the sheath member 392 at its distal end and, optionally with a distal sheath marker 394 , and to a locking hub 405 of a locking mechanism 404 at its proximal end.
  • the sheath locking mechanism comprises a locking hub 405 and a latch 406 which is allowed to slide independently over the infusion tubing 360 .
  • Sheath 390 may be moved distally and proximally along the infusion tubing 360 and locked in place to prevent any further movement along the infusion tubing 360 .
  • a specific number of the infusion holes 370 may be covered or opened.
  • Infusion holes 370 thereby controls the distribution and the amount of medication along the specific area of operation, i.e., the location of the exposed infusion holes 370 relative to a thrombus 396 (or atheroma, stenosis, embolism, plaque, etc.).
  • Infusion holes 370 may be covered and opened alternatively by distally and proximally sliding either only the infusion tubing 360 along core wire 362 , distally and proximally sliding only sheath 390 along the infusion tubing 360 , or manipulating both the infusion tubing 360 along the core wire 362 and the sheath 390 along the infusion tubing 360 simultaneously.
  • Sheath 390 , sheath member 392 and locking hub 405 may be either separate pieces bonded together or a continuous, integral structure.
  • Latch 406 is a separate piece of tubing of the same diameter as sheath 390 slidable distally and proximally along the infusion tubing 360 . However, in counterdistinction of sheath 390 , latch 406 has a tight fit over the infusion tubing 360 , enabling sheath 390 to be secured in a secured position when locking mechanism 404 is engaged or locked.
  • a dilatation balloon delivery system 360 comprises a deployment sheath 362 and a hub 364 .
  • a balloon shaft 366 extends from hub 364 to the distal section 368 of deployment sheath 362 , where the distal portion of balloon shaft 366 comprises an inflatable dilatation balloon 370 .
  • the interior 372 of balloon 370 is in fluid communication with inflation lumen 374 in balloon shaft 366 and an inflation port 376 in hub 364 .
  • Balloon shaft 366 also comprises a guidewire lumen 378 in fluid communication with a guidewire port 380 in hub 364 and extending through balloon 370 to a vascular filter or emboli capture device 382 , as described above.
  • the ends of a filter basket 384 are secured in a fixed grommet 386 and a slidable grommet 388 .
  • deployment sheath 362 is advanced through a patient's vascular system to a desired location. During this stage of the procedure balloon 370 is collapsed, and vascular filter 382 is somewhat compressed. After balloon 370 is in position, deployment sheath 362 is pulled in the proximal direction, and then balloon 370 is expanded to dilate a vessel. Vascular filter 382 expands as grommet 388 slides in the proximal direction.
  • sheath 362 may be advanced distally to collapse vascular filter 382 .
  • vascular filter 382 may be withdrawn together in the proximal direction.
  • a stent delivery system 360 comprises a deployment sheath 362 and a hub 364 .
  • a balloon shaft 366 extends from hub 364 to the distal section 368 of deployment sheath 362 , where the distal portion of inflatable balloon catheter shaft 366 comprises an expandable balloon 370 .
  • the interior 372 of balloon 370 is in fluid communication with an inflation lumen 374 in balloon catheter shaft 366 and an inflation port 376 in hub 364 .
  • Balloon shaft 366 also comprises a guidewire lumen 378 in fluid communication with a guidewire port 380 in hub 364 and extending through balloon 370 to a vascular filter or emboli capture device 382 , as described above.
  • the ends of a filter basket 384 are secured in a fixed grommet 386 and a slidable grommet 388 .
  • An expandable stent 390 is positioned annularly adjacent to balloon 370 .
  • deployment sheath 362 is advanced through a patient's vascular system to a desired location.
  • balloon 370 is either collapsed or expanded only so far as to hold stent 386 in position, and vascular filter 382 is somewhat compressed.
  • deployment sheath 362 is pulled in the proximal direction, and then balloon 370 is expanded to secure stent 390 in position.
  • Vascular filter 382 expands as grommet 388 slides in the proximal direction.
  • sheath 362 may be advanced distally to collapse vascular filter 382 .
  • sheath 362 and vascular filter 382 can be withdrawn together in the proximal direction.
  • stent 390 could be a self-expanding stent that is releasably positioned on a delivery catheter. See, for example, U.S. Pat. Nos. 5,246,445 and 5,372,600.
  • the stent delivery catheter would comprise a lumen for release wires, etc., as well as a lumen for a guidewire lumen in connection with a vascular filter system.
  • vascular filter system comprises a guidewire 360 with a core wire 362 extending distally into floppy tip 364 .
  • Vascular filter 366 comprises a filter membrane 368 positioned in a distally facing manner on filter basket 370 comprised of 6 to 8 struts or wires 372 .
  • the distal 374 and proximal 376 ends of basket wires 372 are held by proximal grommet 378 and distal sliding grommet 380 .
  • filter basket 370 has radiopaque markers 382 .
  • a sheath 388 with expanded distal sheath section 390 is arranged concentrically around guidewire 360 .
  • the vascular filter system will be inserted through a guide catheter in a patient's femoral artery and then advanced through the aorta to a position adjacent the patient's left ventricle.
  • any emboli or thrombus produced will be captured in filter membrane 368 .
  • sheath 388 and filter basket 370 are moved relative to one another so that the distal section 390 of sheath 388 causes filter basket 370 to collapse, whereupon filter basket 370 and captured material are withdrawn with the sheath.
  • FIG. 9 In another exemplary embodiment of the vascular filter system, the apparatus of FIG. 9 could be modified, as shown in FIG. 15.
  • a basket 400 comprised of from four to eight strut wires 402 is secured by a proximal fixed grommet 404 and a distal slidable grommet 406 .
  • Grommet 406 is slidable over core wire 408 .
  • Filter membrane 410 is attached to or arranged upon basket 412 , with the proximal section 414 of the membrane 410 being open to flow, represented by arrow 416 .
  • the proximal portion 414 of membrane 410 forms a conical shape that extends distally.
  • the filter may be deployed by, for example, a sheath, a tube, or a wire fixed to the distal slidable crimp band 406 .
  • Membrane 410 preferably has holes only in proximal section 414 , which holes are arranged as described above. It is believed that under normal, substantially laminar flow conditions debris or emboli 418 will tend to collect in annular recesses 420 .
  • FIG. 16 depicts a guide catheter 430 comprising a catheter shaft 432 having a distal end 434 .
  • a filter membrane 436 having a flexible support or structure is arranged, distally facing, on said distal end 434 .
  • the proximal portion of filter membrane 436 is secured at band 438 .
  • a sheath 440 is arranged concentrically around guide catheter shaft 432 so that when sheath 440 is advanced distally, filter membrane 436 collapses. It is contemplated that other means may be devised for collapsing filter membrane 436 , such as a wire.
  • Guide catheter 430 will preferably have a lumen 442 capable of receiving another device, such as an ablation catheter (not shown).
  • the distal portion of the guide catheter will be advanced through the femoral artery into the left ventricle.
  • an ablation catheter 450 may have a filter membrane 452 arranged proximal to the distal end of catheter 450 by means discussed above, such as a sheath concentric to the catheter or a wire, or other means.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Transplantation (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Vascular Medicine (AREA)
  • Animal Behavior & Ethology (AREA)
  • Cardiology (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Surgical Instruments (AREA)
  • Media Introduction/Drainage Providing Device (AREA)
  • Materials For Medical Uses (AREA)
  • Filtering Materials (AREA)
US10/045,296 1999-02-12 2001-11-07 Vascular filter system Abandoned US20020138094A1 (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
US10/045,296 US20020138094A1 (en) 1999-02-12 2001-11-07 Vascular filter system
US10/198,670 US7399308B2 (en) 1999-02-12 2002-07-19 Vascular filter system
AU2002301808A AU2002301808B2 (en) 2001-11-07 2002-11-04 Vascular filter system
JP2002322806A JP4387092B2 (ja) 2001-11-07 2002-11-06 血管フィルタシステム
EP02257674A EP1310219B1 (de) 2001-11-07 2002-11-06 Filtersystem für Blutgefässe
DE60217264T DE60217264T2 (de) 2001-11-07 2002-11-06 Filtersystem für Blutgefässe
AT02257674T ATE349971T1 (de) 2001-11-07 2002-11-06 Filtersystem für blutgefässe
MXPA02010930A MXPA02010930A (es) 2001-11-07 2002-11-06 Sistema de filtro vascular.
ES02257674T ES2278880T3 (es) 2001-11-07 2002-11-06 Sistema de filtro vascular.
CA002411229A CA2411229C (en) 2001-11-07 2002-11-06 Vascular filter system
ARP020104237A AR037262A1 (es) 2001-11-07 2002-11-06 Sistema de filtro vascular
BRPI0206890-7A BR0206890B1 (pt) 2001-11-07 2002-11-07 sistema de filtro vascular.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/249,377 US6391044B1 (en) 1997-02-03 1999-02-12 Vascular filter system
US10/045,296 US20020138094A1 (en) 1999-02-12 2001-11-07 Vascular filter system

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US09/249,377 Continuation-In-Part US6391044B1 (en) 1997-02-03 1999-02-12 Vascular filter system

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US10/198,670 Continuation US7399308B2 (en) 1999-02-12 2002-07-19 Vascular filter system

Publications (1)

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US20020138094A1 true US20020138094A1 (en) 2002-09-26

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ID=21937082

Family Applications (2)

Application Number Title Priority Date Filing Date
US10/045,296 Abandoned US20020138094A1 (en) 1999-02-12 2001-11-07 Vascular filter system
US10/198,670 Expired - Fee Related US7399308B2 (en) 1999-02-12 2002-07-19 Vascular filter system

Family Applications After (1)

Application Number Title Priority Date Filing Date
US10/198,670 Expired - Fee Related US7399308B2 (en) 1999-02-12 2002-07-19 Vascular filter system

Country Status (11)

Country Link
US (2) US20020138094A1 (de)
EP (1) EP1310219B1 (de)
JP (1) JP4387092B2 (de)
AR (1) AR037262A1 (de)
AT (1) ATE349971T1 (de)
AU (1) AU2002301808B2 (de)
BR (1) BR0206890B1 (de)
CA (1) CA2411229C (de)
DE (1) DE60217264T2 (de)
ES (1) ES2278880T3 (de)
MX (1) MXPA02010930A (de)

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US20030060844A1 (en) 2003-03-27
CA2411229A1 (en) 2003-05-07
BR0206890B1 (pt) 2012-08-21
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EP1310219A3 (de) 2003-06-04
AR037262A1 (es) 2004-11-03
DE60217264D1 (de) 2007-02-15
EP1310219B1 (de) 2007-01-03
JP4387092B2 (ja) 2009-12-16
MXPA02010930A (es) 2005-08-26
AU2002301808B2 (en) 2008-06-26
ATE349971T1 (de) 2007-01-15
US7399308B2 (en) 2008-07-15

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