Patent US4725207A successfully refreshed from Google Patents.
US4725207A
Expired / Lapsed
US
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Automated peritoneovenous shunt
Assignee: University of Minnesota System
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Filing: 1986-06-23
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Granted: 1988-02-16
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Expires: 2006-06-23
Abstract
Abstract An implantable, anti-reflux, fluid displacement peritoneovenous shunt system. The system includes a double chambered multi-micro-orifice ascites collection device, a magnetically driven pump, and an anti-reflux, anti-backdiffusion, non-thrombogenic catheter tip, all connected by flexible tubing. The shunt is used to transfer fluid from the peritoneum to the cardivascular system to prevent accumulation of fluid within the peritoneal cavity. The magnetically operated pump may be of either the reciprocating diaphragm or piston type or it may be a rotary driven bellows displacement pump.
Inventors
- 👤 Henry Buchwald
- 👤 Eugenio Guzman
- 👤 Bruce D. Wigness
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:11
CPC Classifications
A; A61; A61M; A61M27/00; A61M27/002; A61M1/00; A61M1/80; A61M2205/00; A61M2205/82; A61M2205/8206; A61M39/00; A61M39/02; A61M39/0208
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
121 words
An implantable pump for effecting transfer of body fluids which comprises: (A) a housing, (B) a cylindrical chamber within the housing, (C) at least one port communicating with said chamber, (D) pumping means within the chamber for aspirating fluid into said chamber and expelling fluid from the chamber, said pumping means comprising: (1) a closed end bellows disposed within the chamber in fluid-tight sealed relationship thereto, and (2) a central screw jack including a threaded rod and nut in engagement therewith disposed within the bellows with the end of the threaded rod engaging the closed end of the bellows, and (E) a rotatable magnetic armature connected to the nut of the screw jack for rotation therewith for driving said pumping means.
Claim 2
Dependent Claim
121 words
An implantable pump for effecting transfer of body fluids which comprises: (A) a housing, (B) a cylindrical chamber within the housing, (C) at least one port communicating with said chamber, (D) pumping means within the chamber for aspirating fluid into said chamber and expelling fluid from the chamber, said pumping means comprising: (1) a closed end bellows disposed within the chamber in fluid-tight sealed relationship thereto, and (2) a central screw jack including a threaded rod and nut in engagement therewith disposed within the bellows with the end of the threaded rod engaging the closed end of the bellows, and (E) a rotatable magnetic armature connected to the nut of the screw jack for rotation therewith for driving said pumping means.
Claim 3
Dependent Claim
28 words
A pump according to claim 1 wherein said bellows contains a stable volatile liquid having the property of being in equilibrium with its vapor phase at body temperature.
References Cited (Backward Citations)
US3000321A
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GB1541852A
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GB2017420A
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US4185617A
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US4482346A
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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) | 1991-02-15 | 1991-08-17 | 1992-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-15 | 1995-08-17 | 1996-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-15 | 1999-08-17 | 2000-02-16 | $7700.00 | Window Closed / Lapsed |