US4130904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prosthetic blood conduit
Assignee: Thermo Fisher Scientific Inc
•
Filing: 1977-06-06
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Granted: 1978-12-26
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Expires: 1997-06-06
Abstract
Abstract A prosthetic blood conduit comprises two porous concentrically associated tubes with a helical spring enclosed therebetween. Spring strength and frictional engagement between the spring and tubes enables the conduit to resist collapse under a wide variety of stress forces. Convolutions in the tube walls provide flexibility without kinking.
Inventors
- 👤 Robert L. Whalen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:33
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/04; A61F2/06; A61F2/07; A61F2002/072
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
65 words
A blood conduit, comprising: a flexible cylindrical inner tube having convoluted walls to provide flexibility without kinking, said inner tube being porous to promote the formation of a biologically stable interface; a flexible cylindrical outer tube concentrically enclosing said inner tube and having convoluted walls to provide flexibility without kinking; and a helical spring interposed between and frictionally engaging said outer and said inner tubes.
Claim 2
Dependent Claim
65 words
A blood conduit, comprising: a flexible cylindrical inner tube having convoluted walls to provide flexibility without kinking, said inner tube being porous to promote the formation of a biologically stable interface; a flexible cylindrical outer tube concentrically enclosing said inner tube and having convoluted walls to provide flexibility without kinking; and a helical spring interposed between and frictionally engaging said outer and said inner tubes.
Claim 3
Dependent Claim
19 words
The conduit of claim 1, wherein said outer tube is porous to permit tissue ingrowth from the perivascular space.
Claim 4
Dependent Claim
19 words
The conduit of claim 1, wherein said inner tube and said outer tube comprise a woven or knitted fabric.
Claim 5
Dependent Claim
10 words
The conduit of claim 3, wherein said fabric is Dacron.
Claim 6
Dependent Claim
14 words
The conduit of claim 1, wherein said helical spring comprises a stainless steel surface.
Claim 7
Dependent Claim
32 words
The conduit of claim 1, further comprising means for affixing at least one end of said coil spring to the last respective adjacent coil of said spring to form a closed ring.
Claim 8
Dependent Claim
29 words
The conduit of claim 6, further comprising means affixing said inner and outer tubes together and circumferentially to said closed ring to form an end termination for said conduit.
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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) | 1981-12-25 | 1982-06-26 | 1982-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-25 | 1986-06-26 | 1986-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-25 | 1990-06-26 | 1990-12-26 | $7700.00 | Window Closed / Lapsed |