US4957508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Medical tubes
Assignee: Ube Corp
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Filing: 1987-10-30
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Granted: 1990-09-18
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Expires: 2007-10-30
Abstract
Abstract A medical tube characterized in that it dilates at its cut ends toward the external surface when it is cut at any random portion transversely relative to its longitudinal direction. The patency of the sutured portion may be maintained in good condition over a long time, since pannus formation in the internal cavity can be obviated at the sutured portion between an organ of a living body and an artificial medical tube.
Inventors
- 👤 Noriaki Kaneko
- 👤 Yoshimi Hirata
- 👤 Masahiro Moriwaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:12
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/04; A61F2/06; A61F2/064; A61F2/30; A61F2002/30001; A61F2002/30003; A61F2002/3006; A61F2002/30069; A61F2002/30108; A61F2002/30199; A61F2002/30224; A61F2002/30235; A61F2230/00; A61F2230/0063; A61F2230/0069
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
152 words
An implantable tubular synthetic prosthesis for repairing or replacing tubular vessels which comprises a porous, high molecular weight elastomeric tube made of an elastomer selected from the group consisting of polyurethane, polyurethane urea, mixtures of polyurethane and polyurethane urea and mixtures of polyurethane and polyurethane urea with a silicone polymer, said elastomeric tube having an internal and external surface, wherein the internal surface exhibits a dilating force and the external surface exhibits a shrinking force such that the end portions of the tube dilates outwardly towards the external surface of the tube and said tube further dilating along its cut end portions to the external surface thereof when it is cut at any random position along the tube, transverse to its longitudinal direction, said dilation occurring in the area within 5 mm from said ends and cut ends, respectively, and the dilated maximum inner diameter is 1.4 times the inner diameter thereof.
Claim 2
Dependent Claim
152 words
An implantable tubular synthetic prosthesis for repairing or replacing tubular vessels which comprises a porous, high molecular weight elastomeric tube made of an elastomer selected from the group consisting of polyurethane, polyurethane urea, mixtures of polyurethane and polyurethane urea and mixtures of polyurethane and polyurethane urea with a silicone polymer, said elastomeric tube having an internal and external surface, wherein the internal surface exhibits a dilating force and the external surface exhibits a shrinking force such that the end portions of the tube dilates outwardly towards the external surface of the tube and said tube further dilating along its cut end portions to the external surface thereof when it is cut at any random position along the tube, transverse to its longitudinal direction, said dilation occurring in the area within 5 mm from said ends and cut ends, respectively, and the dilated maximum inner diameter is 1.4 times the inner diameter thereof.
Claim 3
Dependent Claim
16 words
The tubular synthetic prosthesis of claim 1 having an inside diameter of 7 mm or less.
Claim 4
Dependent Claim
14 words
The tubular synthetic prosthesis of claim 1 having an inside diameter of 3-4 mm.
Claim 5
Dependent Claim
18 words
The tubular synthetic prosthesis of claim 1 wherein the elastomer has a molecular weight of 400 to 3,000.
References Cited (Backward Citations)
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US4047252A
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US4623347A
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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) | 1993-09-17 | 1994-03-19 | 1994-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-17 | 1998-03-19 | 1998-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-17 | 2002-03-19 | 2002-09-18 | $7700.00 | Window Closed / Lapsed |