US4694832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dialysis probe
Assignee: CMA/MICRODIALYSIS HOLDING AB
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Filing: 1985-11-22
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Granted: 1987-09-22
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Expires: 2005-11-22
Abstract
Abstract A dialysis probe, primarily intended for insertion in biological tissues, for example brain tissue, comprises a dialysis membrane and ducts for flow of the perfusion fluid over the membrane. The dialysis membrane in such a probe can be surrounded by a mounting which supports and partially reveals the membrane, and which is more rigid than the membrane.
Inventors
- 👤 Carl U. Ungerstedt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:54
CPC Classifications
A; A61; A61M; A61M25/00; A61M25/0067; A61M25/0068; A61B; A61B10/00; A61B10/0045; A61B5/00; A61B5/145; A61B5/14525; A61B5/14528; A61M1/00; A61M1/14; A61M1/16; A61M1/1678; A61M25/0082; A61M25/0021; A61M25/0023; A61M25/0026; A61M25/003; A61M2025/0031; A61M2025/0037; A61M2025/0039; A61M2205/00; A61M2205/33; A61M2205/3331; A61M2205/3334; A61M2210/00; A61M2210/06; A61M2210/0693
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
195 words
A dialysis probe for insertion into biological tissues, comprising a hollow fibre dialysis membrane of uniform cross-sectional configuration throughout its length, an elongated mounting that surrounds and supports and includes means for partially exposing the outer surface of the membrane so that the outer exposed surface of the membrane is free to contact biological tissue in which the probe is inserted, the mounting having an exposed outer surface and being substantially more rigid than the membrane and having an internal diameter greater than the greatest external diameter of the membrane, and ducts for supplying and removing perfusion liquid to and from the interior of the membrane, one of said ducts extending to the distal end of the hollow fibre membrane and being open to the distal end of the membrane, said one duct being disposed inside the hollow fibre membrane and having an external diameter substantially less than the internal diameter of the hollow fibre membrane, the other duct communicating with the proximal end of the hollow fibre membrane, substantially all the inner surface of the membrane opposite said outer exposed surface of the membrane being exposed to the flow of liquid between said ducts.
Claim 2
Dependent Claim
195 words
A dialysis probe for insertion into biological tissues, comprising a hollow fibre dialysis membrane of uniform cross-sectional configuration throughout its length, an elongated mounting that surrounds and supports and includes means for partially exposing the outer surface of the membrane so that the outer exposed surface of the membrane is free to contact biological tissue in which the probe is inserted, the mounting having an exposed outer surface and being substantially more rigid than the membrane and having an internal diameter greater than the greatest external diameter of the membrane, and ducts for supplying and removing perfusion liquid to and from the interior of the membrane, one of said ducts extending to the distal end of the hollow fibre membrane and being open to the distal end of the membrane, said one duct being disposed inside the hollow fibre membrane and having an external diameter substantially less than the internal diameter of the hollow fibre membrane, the other duct communicating with the proximal end of the hollow fibre membrane, substantially all the inner surface of the membrane opposite said outer exposed surface of the membrane being exposed to the flow of liquid between said ducts.
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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) | 1990-09-21 | 1991-03-23 | 1991-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-21 | 1995-03-23 | 1995-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-21 | 1999-03-23 | 1999-09-22 | $7700.00 | Window Closed / Lapsed |