Patent US3228000A successfully refreshed from Google Patents.
US4883486A
Expired / Lapsed
US
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Prosthetic ligament
Assignee: MEDEX ORTHOPEDICS Inc
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Filing: 1988-05-31
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Granted: 1989-11-28
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Expires: 2008-05-31
Abstract
Abstract A prosthetic ligament has an outer sheath of permeable PTFE yarn surrounding a core of synthetic filaments with stitching through the sheath and core holding the two firmly together to act as a single integral unit when placed in situ.
Inventors
- 👤 Indu Kapadia
- 👤 Kemal Schankereli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:34
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/08; A61L; A61L27/00; A61L27/14; A61L27/16; A61F2250/00; A61F2250/0058; A61F2250/0096; A61F2250/0098; A61L2430/00; A61L2430/10
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
75 words
A ligament prosthesis for implanting in situ in a body, comprising: an elongated tubular porous sheath made of PTFE yarn; an unwoven non-braided core within said sheath, said core comprising a plurality of linearly arranged high tenacity strands of polyester running generally parallel to one another and to the central axis of said sheath; said core being anchored to said sheath with a stitching of multifilamentous synthetic thread passing through said sheath and said core.
Claim 2
Dependent Claim
75 words
A ligament prosthesis for implanting in situ in a body, comprising: an elongated tubular porous sheath made of PTFE yarn; an unwoven non-braided core within said sheath, said core comprising a plurality of linearly arranged high tenacity strands of polyester running generally parallel to one another and to the central axis of said sheath; said core being anchored to said sheath with a stitching of multifilamentous synthetic thread passing through said sheath and said core.
Claim 3
Dependent Claim
25 words
The prosthetic ligament as in claim 1 wherein said sheath has a permeability sufficient to permit tissue ingrowth into the sheath when placed in situ.
Claim 4
Dependent Claim
35 words
The prosthetic ligament as in claim 1 wherein said sheath is characterized by having a permeability in the range of about 20 to 200 ml/min/cm 2 and a density of about 40-70 picks per inch.
Claim 5
Dependent Claim
35 words
The prosthetic ligament as in claim 1 wherein said stitching is a continuous zig-zag or wavy pattern along the length of the sheath and in the range of about six to fifteen stitches per inch.
Claim 6
Dependent Claim
15 words
The prosthetic ligament as in claim 4 wherein the sheath is generally elliptical in cross-section.
Claim 7
Dependent Claim
21 words
The prosthetic ligament as in claim 1 wherein said core comprises in the range from about six to about seventy strands.
Claim 8
Dependent Claim
21 words
The prosthetic ligament as in claim 6 wherein said strands each have a tenacity greater than about five grams per denier.
Claim 9
Dependent Claim
15 words
The prosthetic ligament as in claim 1 further including a radiopaque monofilament in said core.
Claim 10
Dependent Claim
24 words
The prosthetic ligament as in claim 1 further including a collagen coating on said core strands and on said sheath for inducing tissue growth.
Claim 11
Dependent Claim
25 words
The prosthetic ligament as in claim 1, said ligament having two ends and further including a guide tip attached to an end of said ligament.
Claim 12
Dependent Claim
36 words
The prosthetic ligament as in claim 1, said ligament having two ends and further including a loop at an end of said ligament formed by looping the end back onto the ligament and attaching it thereto.
Claim 13
Dependent Claim
25 words
The prosthetic ligament as in claim 1 wherein said sheath is made of bleached 225 denier 30 filament yarn of about 40-70 picks per inch.
Claim 14
Dependent Claim
34 words
The prosthetic ligament as in claim 1 wherein said core comprises in the range of about 6 to 70 strands of yarn each in the range of about 0.47 square mms. in cross-sectional area.
Claim 15
Dependent Claim
13 words
The prosthetic ligament as in claim 1 wherein said sheath yarns are braided.
Claim 16
Dependent Claim
13 words
The prosthetic ligament as in claim 1 wherein said sheath yarns are woven.
Claim 17
Dependent Claim
13 words
The prosthetic ligament as in claim 1 wherein said sheath yarns are knitted.
Claim 18
Dependent Claim
26 words
The prosthetic ligament as in claim 1 wherein said stitching comprises a series of separate cross-stitches spaced from one another along the length of the sheath.
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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) | 1992-11-27 | 1993-05-29 | 1993-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-27 | 1997-05-29 | 1997-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-27 | 2001-05-29 | 2001-11-28 | $7700.00 | Window Closed / Lapsed |