Patent US4874360A successfully refreshed from Google Patents.
US4874360A
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Ureteral stent system
Assignee: Cabot Technology Corp
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Filing: 1988-07-01
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Granted: 1989-10-17
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Expires: 2008-07-01
Abstract
Abstract A ureteral stent has a main body that is soft and flexible and a proximal hook portion which is stiffer to minimize expulsion from the kidney.
Inventors
- 👤 Jay R. Goldberg
- 👤 Donald V. Hillegass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:38
CPC Classifications
A; A61; A61M; A61M27/00; A61M27/002; A61M27/008
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
In a ureteral stent comprising an elongated member having a soft, flexible main body with a first hook at one end for placement in the bladder of a patient and a second hook at the other end for placement in the patient's kidney, the improvement which comprises forming said stent of a homogeneous, essentially linear, segmented aliphatic polyurethane elastomer cmposed of three repeating units, a diol, a diisocyanate and a macroglycol, the main body and first hook of said stent having a durometer of about 50 to about 80 Shore "A" and the second hook having a durometer of about 95 Shore "A" and a good memory that enables it to quickly resume its hook shape at body temperature when a hook straightening force has been removed.
Claim 2
Dependent Claim
127 words
In a ureteral stent comprising an elongated member having a soft, flexible main body with a first hook at one end for placement in the bladder of a patient and a second hook at the other end for placement in the patient's kidney, the improvement which comprises forming said stent of a homogeneous, essentially linear, segmented aliphatic polyurethane elastomer cmposed of three repeating units, a diol, a diisocyanate and a macroglycol, the main body and first hook of said stent having a durometer of about 50 to about 80 Shore "A" and the second hook having a durometer of about 95 Shore "A" and a good memory that enables it to quickly resume its hook shape at body temperature when a hook straightening force has been removed.
References Cited (Backward Citations)
US4212304A
Cited
US4671795A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-16 | 1993-04-17 | 1993-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-16 | 1997-04-17 | 1997-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-16 | 2001-04-17 | 2001-10-17 | $7700.00 | Window Closed / Lapsed |