US5312550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for detecting undesired dialysis recirculation
Assignee: University of Mississippi Medical Center
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Filing: 1992-04-27
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Granted: 1994-05-17
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Expires: 2012-04-27
Abstract
Abstract In a dialysis system wherein blood is removed from a patient's vascular system and passed through a dialyzer system comprising an inlet arterial line, a dialyzer, and an outlet venous line, the blood being fed via the inlet arterial line to the dialyzer and returned to the patient via the outlet venous line, a material having a physical property differing from that of blood is injected at a point in the venous return line. The fluid in the dialysis system upstream from the injection point is monitored for the presence of the different physical property whereby direct recirculation from the venous return line to the arterial intake line is detected.
Inventors
- 👤 Robert L. Hester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:55
CPC Classifications
A; A61; A61M; A61M1/00; A61M1/36; A61M1/3621; A61M1/3653; A61M1/3656; A61M1/3658; A61M1/367
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
126 words
In a dialysis process wherein blood is removed from a patient's vascular system and passed through a dialyzer system comprising an inlet arterial line, a dialyzer, and an outlet venous line, said blood being fed via said inlet arterial line to said dialyzer and returned to the patient via said outlet venous line, the improvement comprising: (a) injecting a material at an injection point in said dialyzer system, said material having a physical property differing from that of blood; and (b) monitoring the fluid in said dialyzer system at a point in said dialyzer system upstream from said injection point for the presence of said differing physical property, to thereby detect undesired recirculation of freshly dialyzed blood from said venous line directly to said arterial line.
Claim 2
Dependent Claim
126 words
In a dialysis process wherein blood is removed from a patient's vascular system and passed through a dialyzer system comprising an inlet arterial line, a dialyzer, and an outlet venous line, said blood being fed via said inlet arterial line to said dialyzer and returned to the patient via said outlet venous line, the improvement comprising: (a) injecting a material at an injection point in said dialyzer system, said material having a physical property differing from that of blood; and (b) monitoring the fluid in said dialyzer system at a point in said dialyzer system upstream from said injection point for the presence of said differing physical property, to thereby detect undesired recirculation of freshly dialyzed blood from said venous line directly to said arterial line.
Claim 3
Dependent Claim
17 words
The process defined in claim 1, wherein said material is a saline solution substantially isotonic with blood.
Claim 4
Dependent Claim
19 words
The process defined in claim 2, wherein said step of monitoring comprises measuring the optical density of said fluid.
Claim 5
Dependent Claim
19 words
The process defined in claim 1, wherein said step of monitoring comprises measuring the optical density of said fluid.
Claim 6
Dependent Claim
15 words
The proces defined in claim 1, wherein said injection point is in said venous line.
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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) | 1997-05-16 | 1997-11-15 | 1998-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-16 | 2001-11-15 | 2002-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-05-16 | 2005-11-15 | 2006-05-17 | $7700.00 | Window Closed / Lapsed |