US5375612A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Possibly absorbable blood filter
Assignee: B Braun Medical SAS
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Filing: 1993-03-30
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Granted: 1994-12-27
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Expires: 2013-03-30
Abstract
Abstract The invention relates to an implantable blood filter comprising a self-expanding external structure made from a zigzagged thread wound on itself in order to exhibit a closed configuration. A central strainer section is connected to the said thread at various points for the retention of possible blood clots. This strainer section may be made from a biologically absorbable material. Applications include the production of medical blood filters, which are self-centering and absorbable.
Inventors
- 👤 Jean-Philippe Cottenceau
- 👤 Gerard Chevillon
- 👤 Maurice Roussigne
- 👤 Guy Nadal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:32
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/82; A61F2/86; A61F2/01; A61F2/0105; A61F2002/016; A61F2/95; A61F2002/9505; A61F2002/9511; A61F2220/00; A61F2220/0008; A61F2220/0016; A61F2220/0025; A61F2220/0075; A61F2230/00; A61F2230/0002; A61F2230/0004; A61F2230/0006; A61F2230/0017; A61F2230/0028; A61F2230/005; A61F2230/0054; A61F2230/0058; A61F2230/0063; A61F2230/0069; A61F2230/0073; A61F2230/0078
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
65 words
A blood filter comprising: a wire formed in a zigzag configuration including an endless series of straight sections being joined by bends at opposite ends to form, upon expansion in a blood vessel, a cylindrical, open tubular wall; and separate filtering means connected to the tubular wall, and extending therein, to cover at least one end of the tubular wall for filtering encountered blood clots.
Claim 2
Dependent Claim
65 words
A blood filter comprising: a wire formed in a zigzag configuration including an endless series of straight sections being joined by bends at opposite ends to form, upon expansion in a blood vessel, a cylindrical, open tubular wall; and separate filtering means connected to the tubular wall, and extending therein, to cover at least one end of the tubular wall for filtering encountered blood clots.
Claim 3
Dependent Claim
28 words
The filter set forth in claim 1 wherein the wire is flexible and therefore allows contraction of the zigzag configuration during installation of the filter into the vessel.
Claim 4
Dependent Claim
29 words
The filter set forth in claim 1 further comprising: retaining means attached to the wire and adapted to penetrate the blood vessel for anchoring the filter within the vessel.
Claim 5
Dependent Claim
86 words
A blood filter comprising: a flexible wire formed in a zigzag configuration including an endless series of straight sections being joined by bends at opposite ends to form, upon expansion in a blood vessel, a cylindrical, open tubular wall: separate filtering means connected to the tubular wall, and extending therein, to cover at least one end of the tubular wall for filtering encountered blood clots; and retaining means extending from the wire and adapted to penetrate the blood vessel for anchoring the filter within the vessel.
Claim 6
Dependent Claim
86 words
A blood filter comprising: a flexible wire formed in a zigzag configuration including an endless series of straight sections being joined by bends at opposite ends to form, upon expansion in a blood vessel, a cylindrical, open tubular wall: separate filtering means connected to the tubular wall, and extending therein, to cover at least one end of the tubular wall for filtering encountered blood clots; and retaining means extending from the wire and adapted to penetrate the blood vessel for anchoring the filter within the vessel.
Claim 7
Dependent Claim
26 words
The filter set forth in claim 1 or 4 wherein the cross-section of the tubular wall increases upon its expansion, after installation in the blood vessel.
Claim 8
Dependent Claim
23 words
The filter set forth in claim 1 or 4 wherein the separate filtering means is attached along its periphery to the tubular wall.
Claim 9
Dependent Claim
49 words
The filter set forth in claim 1 or 4 wherein: the filtering means further comprises a material which is biologically absorbed when the filter has been implanted for a predetermined time; and further wherein a central portion of the filter means is more quickly absorbed than the periphery thereof.
Claim 10
Dependent Claim
23 words
The filter set forth in claim 4 wherein the zigzag configuration comprises multiple pairs of straight line sections connected by an intermediate bend.
Claim 11
Dependent Claim
35 words
The filter set forth in claim 1 or 4 wherein the filtering means further comprises a flexible filament material forming a strainer with smaller mesh openings in a central portion than at the periphery thereof.
Claim 12
Dependent Claim
31 words
The filter set forth in claim 1 or 4 wherein the filtering means further comprises a flexible filament material which is thinner at a central portion than at the periphery thereof.
Claim 13
Dependent Claim
55 words
The filter set forth in claim 1 or 4 wherein the filtering means further comprises: a flexible filament material extending inside the zigzag wire configuration to form an hourglass shaped strainer peripherally attached to opposite ends of the configuration and having a longitudinally disposed junction point located in a median axial zone of the configuration.
Claim 14
Dependent Claim
30 words
The filter set forth in claim 11 further comprising: at least one transverse hoop of flexible filament located along the length of the hourglass shaped strainer for increasing filtering action.
Claim 15
Dependent Claim
29 words
The filter set forth in claim 1 or 4 wherein the filtering means further comprises a star shaped body having a plurality of arms radiating from a central point.
Claim 16
Dependent Claim
19 words
The filter set forth in claim 13 wherein the central point has a reduced thickness relative to the arms.
Claim 17
Dependent Claim
20 words
The filter set forth in claim 13 wherein the body further comprises branch sections interconnecting medial points along adjacent arms.
Claim 18
Dependent Claim
45 words
The filter set forth in claim 13 wherein the star shaped body is made from a material which is biologically absorbed after the filter is implanted for a preselected period of time, the material belonging to the group consisting of poly(glycolic acid) and poly(lactic acid).
Claim 19
Dependent Claim
21 words
The filter set forth in claim 9 wherein the filaments of the filtering means are fabricated from an absorbable suture material.
Claim 20
Dependent Claim
34 words
The filter set forth in claim 1 or 4 wherein the zigzags of the filter configuration have loop eyes formed at least one end of the tubular wall for connecting the filtering means thereto.
Claim 21
Dependent Claim
117 words
A blood filter device comprising: an axially disposed tubular wall having openings therein; first and second transverse ends defining axial limits of the wall: the tubular wall formed from at least one wire having a zigzag configuration; separate filtering means connected to the wall and extending therein to cover at least one of the transverse ends for trapping blood clots; the filter device being sufficiently flexible to allow size reducing radial contraction thereof, relative to a central axis, to facilitate insertion of the filter into a blood vessel; the filter device further being sufficiently resilient to cause radial expansion thereof within the blood vessel, the expansion limited by restraining contact of the tubular wall by a vessel.
Claim 22
Dependent Claim
117 words
A blood filter device comprising: an axially disposed tubular wall having openings therein; first and second transverse ends defining axial limits of the wall: the tubular wall formed from at least one wire having a zigzag configuration; separate filtering means connected to the wall and extending therein to cover at least one of the transverse ends for trapping blood clots; the filter device being sufficiently flexible to allow size reducing radial contraction thereof, relative to a central axis, to facilitate insertion of the filter into a blood vessel; the filter device further being sufficiently resilient to cause radial expansion thereof within the blood vessel, the expansion limited by restraining contact of the tubular wall by a vessel.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-12-26 | 1998-06-27 | 1998-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-12-26 | 2002-06-27 | 2002-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-12-26 | 2006-06-27 | 2006-12-27 | $7700.00 | Window Closed / Lapsed |