US4229838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vascular prosthesis having a composite structure
Assignee: Sumitomo Electric Industries Ltd
•
Filing: 1978-07-03
•
Granted: 1980-10-28
•
Expires: 1998-07-03
Abstract
Abstract A vascular prosthesis having a composite structure of a porous tubing of polytetrafluoroethylene with polyethyleneimine in the pores of the tubing, the polyethyleneimine being water-insolubilized with the amino groups quaternized and having heparin ionically bound thereto.
Inventors
- 👤 Hiroshi Mano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:19
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/28; A61L27/34; A61L27/14; A61L27/16; A61L33/00; A61L33/0005; A61L33/0011; A61L33/0029
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
36 words
A vascular prosthesis having a composite structure of a porous tubing of polytetrafluoroethylene with polyethyleneimine in the pores of the tubing, said polyethyleneimine being water-insolubilized with the amino groups quaternized and having heparin ionically bound thereto.
Claim 2
Dependent Claim
36 words
A vascular prosthesis having a composite structure of a porous tubing of polytetrafluoroethylene with polyethyleneimine in the pores of the tubing, said polyethyleneimine being water-insolubilized with the amino groups quaternized and having heparin ionically bound thereto.
Claim 3
Dependent Claim
27 words
The vascular prosthesis of claim 1 wherein the polyethyleneimine is a microporous polyethyleneimine which is water-insolubilized with the amino groups quaternized and has heparin ionically bound thereto.
Claim 4
Dependent Claim
45 words
The vascular prosthesis of claim 1 wherein the polytetrafluoroethylene has a microstructure composed of fibers and nodes connected to one another by the fibers, and the microstructure of the outer surface of the tubing differs from the microstructure of the inner surface of the tubing.
Claim 5
Dependent Claim
37 words
The vascular prosthesis of claim 3, wherein the outer surface of the porous tubing has an average fiber diameter at least two times larger than the average fiber diameter of the inner surface of the porous tubing.
Claim 6
Dependent Claim
40 words
The vascular prosthesis of claim 3, wherein the direction of the fiber alignment of the inner surface of the porous tubing is more radially distributed than the direction of the fiber alignment of the outer surface of the porous tubing.
Claim 7
Dependent Claim
42 words
The vascular prosthesis of claim 3, wherein the long axes of the nodes at the outer surface of the porous tubing are at least two times longer than the long axes of the nodes at the inner surface of the porous tubing.
Claim 8
Dependent Claim
32 words
The vascular prosthesis of claim 3, wherein the pore diameter of the outer surface of the porous tubing is larger than the pore diameter of the inner surface of the porous tubing.
Claim 9
Dependent Claim
29 words
The vascular prosthesis of claim 1, wherein said polyethyleneimine is present only in those pores of the porous tubing which are on the inner surface of the porous tubing.
References Cited (Backward Citations)
US3105492A
Cited
US3425418A
Cited
US3272204A
Cited
US3511684A
Cited
DE2508570A1
Cited
US4082893A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-10-28 | 1984-04-28 | 1984-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-28 | 1988-04-28 | 1988-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-28 | 1992-04-28 | 1992-10-28 | $7700.00 | Window Closed / Lapsed |