Patent US3620218A successfully refreshed from Google Patents.
US3620218A
Expired / Lapsed
US
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Cylindrical prosthetic devices of polyglycolic acid
Assignee: Wyeth Holdings LLC
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Filing: 1969-08-25
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Granted: 1971-11-16
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Expires: 1989-08-25
Abstract
Abstract Polyhydroxyacetic ester, also called polyglycolic acid (PGA), has surgically useful mechanical properties as a solid prosthesis, such as reinforcing pins, screws, plates, or cylinders. On implantation, in living mammalian tissue, the polyglycolic acid is absorbed, and replaced by living tissue.
Inventors
- 👤 Edward Emil Schmitt
- 👤 Rocco Albert Polistina
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:17
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/62; D01F6/625; A; A61; A61B; A61B17/00; A61B17/11; A61L; A61L31/00; A61L31/04; A61L31/06; A61B2017/00004
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
102 words
An absorbable prosthesis for the anastomosis of vessels in the tissue of a living mammal consisting essentially of a hollow cylinder of polyglycolic acid, having an inner diameter approximately the same as the inner diameter of the subject vessel, and a smooth outer surface of a diameter which is insertable in said vessel when stretched, whereby one end of a vessel from traumatic or surgical severance may be emplaced over each end of said cylinder, and fixedly positioned thereon, said cylinder being open to and permitting the flow of body fluids, and being absorbable by living mammalian tissue within a few weeks.
Claim 2
Dependent Claim
102 words
An absorbable prosthesis for the anastomosis of vessels in the tissue of a living mammal consisting essentially of a hollow cylinder of polyglycolic acid, having an inner diameter approximately the same as the inner diameter of the subject vessel, and a smooth outer surface of a diameter which is insertable in said vessel when stretched, whereby one end of a vessel from traumatic or surgical severance may be emplaced over each end of said cylinder, and fixedly positioned thereon, said cylinder being open to and permitting the flow of body fluids, and being absorbable by living mammalian tissue within a few weeks.
Claim 3
Dependent Claim
63 words
The absorbable prosthesis of claim 1 in cooperative configuration with at least one circular cooperative clamp, whereby in assembled relationship, with a vascular vessel end on each end of said cylinder, thE vascular vessel ends are uniformly positioned and retained on said cylinder, tightly enough to avoid substantial slippage, and loosely enough to permit circulation into the vessel ends, and hence avoid necrosis.
Claim 4
Dependent Claim
40 words
The absorbable prosthesis of claim 2 in which the said cooperative clamp is a single split ring, with inward tension sufficient to hold the ends of said vascular vessels, when positioned over said vessels in place over said hollow cylinder.
Claim 5
Dependent Claim
54 words
The absorbable prosthesis of claim 2 having two circularly bent rod clamps, said clamps having radii of curvature such that the vascular vessels are held against the hollow cylinder with approximately uniform pressure, around the periphery of said cylinder sufficiently tight to retain the vascular vessels during regeneration, but loosely enough to avoid necrosis.
Claim 6
Independent Claim
91 words
A method of anastomizing two vessels in living mammalian tissue comprising inserting one end of a hollow cylinder of polyglycolic acid having an inner diameter of approximately the inner diameter of one of the vessels in the end of each of the vessels, so that the ends of the vessels abut, and fastening the ends of the vessels in abutting relationship over said cylinder of polyglycolic acid, said cylinder being open to and permitting the flow of body fluids, and being absorbed by said living mammalian tissue within a few weeks.
Claim 7
Independent Claim
91 words
A method of anastomizing two vessels in living mammalian tissue comprising inserting one end of a hollow cylinder of polyglycolic acid having an inner diameter of approximately the inner diameter of one of the vessels in the end of each of the vessels, so that the ends of the vessels abut, and fastening the ends of the vessels in abutting relationship over said cylinder of polyglycolic acid, said cylinder being open to and permitting the flow of body fluids, and being absorbed by said living mammalian tissue within a few weeks.
Claim 8
Dependent Claim
22 words
The method of claim 5 in which the ends of the vessels are fastened in abutting relationship by suturing the ends together.
References Cited (Backward Citations)
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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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |