CA2648325A1 - Removable embolus blood clot filter - Google Patents

Removable embolus blood clot filter Download PDF

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Publication number
CA2648325A1
CA2648325A1 CA002648325A CA2648325A CA2648325A1 CA 2648325 A1 CA2648325 A1 CA 2648325A1 CA 002648325 A CA002648325 A CA 002648325A CA 2648325 A CA2648325 A CA 2648325A CA 2648325 A1 CA2648325 A1 CA 2648325A1
Authority
CA
Canada
Prior art keywords
filter
elongate
spaced
longitudinal axis
blood clot
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.)
Granted
Application number
CA002648325A
Other languages
French (fr)
Other versions
CA2648325C (en
Inventor
Adrian C. Ravenscroft
Stephen J. Kleshinski
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CR Bard Inc
Original Assignee
NMT Medical Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NMT Medical Inc filed Critical NMT Medical Inc
Publication of CA2648325A1 publication Critical patent/CA2648325A1/en
Application granted granted Critical
Publication of CA2648325C publication Critical patent/CA2648325C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • A61F2/0105—Open ended, i.e. legs gathered only at one side
    • 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
    • A61F2/0103—With centering means
    • 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
    • A61F2/012—Multiple filtering units
    • 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
    • A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/848—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents having means for fixation to the vessel wall, e.g. barbs
    • A61F2002/8483—Barbs
    • 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
    • A61F2230/0028—Shapes in the form of latin or greek characters
    • A61F2230/005—Rosette-shaped, e.g. star-shaped
    • 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

Abstract

This invention is a blood clot filter (10) which is collapsible toward a central longitudinal axis into a collapsed configuration for insertion into a blood vessel, and which is radially expandable outwardly from the longitudinal axis to an expanded configuration for contact with the inner wall of the blood vessel at two longitudinal spaced locations. A
first plurality of spaced, elongate arms (26), in the expanded configuration of the filter (10), curve outwardly away from the longitudinal axis toward the leading end of the filter to form a first filter basket (14), and to center a hub (12) at the trailing end of the filter (14) within the vessel. A second plurality of spaced elongate legs (18) angle outwardly away from the longitudinal axis toward the leading edge of the filter (14) in the expanded configuration thereof to form a second filter basket (16) opening toward the leading end.
To prevent longitudinal movement of the filter (10), the ends of these legs (26) include hooks (28), at least a portion of which is of a reduced cross-sectional area relative to the cross-sectional area of the adjacent leg to permit the hooks (28) to bend and straighten in response to the withdrawal force.

Claims (9)

1. A blood clot filter having a central longitudinal axis and which is collapsible into a collapsed configuration toward said longitudinal axis for insertion into a blood vessel and which is radially expandable outwardly from said longitudinal axis to an expanded configuration for contact with an inner wall of said blood vessel, said blood clot filter having leading and trailing ends and comprising:

a plurality of elongate spaced legs having first and second ends, the first ends of said elongate spaced legs being mounted adjacent to said longitudinal axis and said plurality of elongate, spaced legs being formed to extend angularly outwardly away from said longitudinal axis toward the leading end of said filter to second ends of said elongate, spaced legs which are spaced outwardly from said longitudinal axis in the expanded configuration of said filter, and a plurality of spaced, elongate arms having first and second ends, said first ends of said spaced, elongate arms being mounted adjacent to said longitudinal axis, each of said spaced, elongate arms in the expanded configuration of said filter being formed to extend angularly outwardly away from the longitudinal axis of said filter toward the leading end of said filter to a shoulder spaced between said first and second ends of said elongate arm and then angularly inwardly from said shoulder in the direction of the longitudinal axis of said filter toward the filter leading end to the second end of the said elongate arm.
2. The blood clot filter of claim 1 wherein each of said spaced, elongate arms includes a first arm section which extends from the first end of said arm to said shoulder and a second arm section that extends from said shoulder to the second end of said arm, said first arm section angling outwardly in the expanded configuration of said filter from the first end thereof at a greater angle relative to the longitudinal axis of said filter than the outward angle of said elongate, spaced legs relative to said longitudinal axis of said filter.
3. The blood clot filter of claim 2 wherein the distance between the first and second ends of said elongate, spaced legs is greater than the distance between the first and second ends of said spaced, elongate arms.
4. The blood clot filter of claim 3 wherein said elongate spaced legs are each formed to be substantially straight between the first and second ends thereof and said spaced, elongate arms are each formed to have a substantially straight first arm section between said first end and the shoulder thereof and a substantially straight second arm section between the shoulder and the second end thereof.
5. The blood clot filter of claim 3 wherein said elongate legs extend toward the leading end of said filter to form a first filter basket and each said elongate arm angles outwardly from the longitudinal axis of said filter toward the leading end of said filter and then angles away from said elbow toward the leading end of said filter to form a second filter basket.
6. The blood clot filter of claim 4 wherein each of said elongate spaced legs and the second arm section of each of said spaced elongate arms is formed to engage the inner wall of said blood vessel at an angle within a range of from ten to forty five degrees adjacent to the respective second ends thereof in the expanded configuration of said filter.
7. The blood clot filter of claim 1 wherein one or more of said plurality of elongate spaced legs includes an outwardly curved hook terminating at a point at the second end thereof to engage and penetrate the vessel inner wall in the expanded configuration of said filter, said curved hook being formed with an elasticity sufficient to cause the hook to deform and straighten to permit withdrawal of the hook from the vessel inner wall in response to stress on the hook resulting from force applied to the trailing end of the filter to move the filter in a direction away from the filter leading end.
8. The blood clot filter of claim 7 wherein at least a portion of said hook spaced from said point is formed with a cross sectional area of reduced size relative to the cross sectional area of said elongate leg to permit said hook to bend toward a straightened configuration in response to force applied to the trailing end of said filter.
9. The blood clot filter of claim 7 wherein the elongate spaced legs and each outwardly curved hook included thereon are integrally formed of thermal shape memory material having a temperature transformation level below which the material is in a martensitic state and relatively pliable and compressible and above which the material is normally in an austenitic state and self-expandable to a substantially rigid, predetermined configuration, said material exhibiting stress sensitivity which can cause the material to transform to the martensitic state in response to stress while the temperature of the material remains above the temperature transformation level, each said outwardly curved hook being formed to be transformed from the austenitic state to the martensitic state in response to stress on the hook resulting from force applied to the trailing edge of the filter to move the filter away from the filter leading end while the elongate spaced legs remain in the austenitic state.
CA2648325A 1998-09-25 1999-09-23 Removable embolus blood clot filter Expired - Lifetime CA2648325C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/160,384 1998-09-25
US09/160,384 US6007558A (en) 1998-09-25 1998-09-25 Removable embolus blood clot filter
CA002344375A CA2344375C (en) 1998-09-25 1999-09-23 Removable embolus blood clot filter

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CA002344375A Division CA2344375C (en) 1998-09-25 1999-09-23 Removable embolus blood clot filter

Publications (2)

Publication Number Publication Date
CA2648325A1 true CA2648325A1 (en) 2000-04-06
CA2648325C CA2648325C (en) 2012-07-24

Family

ID=22576667

Family Applications (2)

Application Number Title Priority Date Filing Date
CA2648325A Expired - Lifetime CA2648325C (en) 1998-09-25 1999-09-23 Removable embolus blood clot filter
CA002344375A Expired - Lifetime CA2344375C (en) 1998-09-25 1999-09-23 Removable embolus blood clot filter

Family Applications After (1)

Application Number Title Priority Date Filing Date
CA002344375A Expired - Lifetime CA2344375C (en) 1998-09-25 1999-09-23 Removable embolus blood clot filter

Country Status (10)

Country Link
US (2) US6007558A (en)
EP (3) EP1537835B1 (en)
JP (1) JP3703718B2 (en)
AT (1) ATE295131T1 (en)
CA (2) CA2648325C (en)
DE (1) DE69925298T2 (en)
DK (1) DK1123125T3 (en)
ES (3) ES2603534T3 (en)
PT (1) PT1123125E (en)
WO (1) WO2000018467A1 (en)

Cited By (9)

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US8372109B2 (en) 2004-08-04 2013-02-12 C. R. Bard, Inc. Non-entangling vena cava filter
US8430903B2 (en) 2005-08-09 2013-04-30 C. R. Bard, Inc. Embolus blood clot filter and delivery system
US8574261B2 (en) 2005-05-12 2013-11-05 C. R. Bard, Inc. Removable embolus blood clot filter
US8613754B2 (en) 2005-05-12 2013-12-24 C. R. Bard, Inc. Tubular filter
US8690906B2 (en) 1998-09-25 2014-04-08 C.R. Bard, Inc. Removeable embolus blood clot filter and filter delivery unit
US9131999B2 (en) 2005-11-18 2015-09-15 C.R. Bard Inc. Vena cava filter with filament
US9204956B2 (en) 2002-02-20 2015-12-08 C. R. Bard, Inc. IVC filter with translating hooks
US9326842B2 (en) 2006-06-05 2016-05-03 C. R . Bard, Inc. Embolus blood clot filter utilizable with a single delivery system or a single retrieval system in one of a femoral or jugular access
US10188496B2 (en) 2006-05-02 2019-01-29 C. R. Bard, Inc. Vena cava filter formed from a sheet

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