US5129789A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means and method of pumping fluids, particularly biological fluids
Assignee: Advanced Medical Systems Inc
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Filing: 1990-04-23
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Granted: 1992-07-14
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Expires: 2010-04-23
Abstract
Abstract A system for pumping of fluids, particularly biological fluids such as blood, including a tubular length of magnetostrictive material. One-way valves are positioned generally in opposite ends of the tubular material. Fluid flow conduits are connected to the opposite ends of the tubular material. A magnetic field is imposed, generally by an electric coil, in a pulsed fashion to the tubular material to cause alternatingly magnetostriction and relaxation of the tubular material. This causes a reciprocating variation in the distance between the one-way valves which oppositely are opened and closed to produce a pumping action through the tubular material.
Inventors
- 👤 Kenneth O. Thornton
- 👤 Steven J. Phillips
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:50
CPC Classifications
F; F04; F04B; F04B43/00; F04B43/08; F04B43/09; F04B43/095; A; A61; A61M; A61M60/00; A61M60/10; A61M60/104; A61M60/117; A61M60/122; A61M60/196; A61M60/40; A61M60/424; A61M60/457; A61M60/462; A61M60/50; A61M60/508; A61M60/515; A61M60/562; A61M60/569; A61M60/592; A61M60/80; A61M60/835; A61M60/837; A61M60/845; A61M60/851; A61M60/855; A61M60/871; A61M60/873; A61M60/89; A61M60/894; A61M60/896; A61M2205/00; A61M2205/33; A61M2205/3303; A61M60/126; A61M60/148
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
62 words
A method of pumping useable blood comprising: connecting a useable blood inlet conduit and a useable blood outlet conduit to a length of magnetostrictive tubing having a longitudinal axis; keeping the length of magnetostrictive tubing under compression along its longitudinal axis; and imposing a pulsed electromagnetic field on the tubing to cause magnetostriction of the tubing and blood displacement in one direction.
Claim 2
Independent Claim
62 words
A method of pumping useable blood comprising: connecting a useable blood inlet conduit and a useable blood outlet conduit to a length of magnetostrictive tubing having a longitudinal axis; keeping the length of magnetostrictive tubing under compression along its longitudinal axis; and imposing a pulsed electromagnetic field on the tubing to cause magnetostriction of the tubing and blood displacement in one direction.
Claim 3
Dependent Claim
16 words
The method of claim 2 wherein the electromagnetic field is pulsed by a DC power source.
Claim 4
Dependent Claim
18 words
The method of claim 1 further comprising the step of controlling the amplitude of the pulsed electromagnetic field.
Claim 5
Dependent Claim
18 words
The method of claim 1 further comprising the step of controlling the frequency of the pulsed magnetic field.
Claim 6
Dependent Claim
17 words
The method of claim 5 wherein a permanent magnet is utilized when generating the pulsed electromagnetic field.
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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) | 1995-07-14 | 1996-01-13 | 1996-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-14 | 2000-01-13 | 2000-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-14 | 2004-01-13 | 2004-07-14 | $7700.00 | Window Closed / Lapsed |