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Patent US4172033A successfully refreshed from Google Patents.
US4172033A
Expired / Lapsed
US
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Artificial kidney proportioning system
Assignee: Althin Medical Inc
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Filing: 1977-10-13
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Granted: 1979-10-23
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Expires: 1997-10-13
Abstract
Abstract An artificial kidney dialysate system provides a predetermined rate of flow of dialysate solution into a dialyzer, and a predetermined rate of flow of dialysate solution from the outlet of the dialyzer. Through positive displacement pumping at the inlet and outlet of the dialyzer, the two rates can be adjusted so that an accurately predetermined quantity of excess fluid from the patient's blood stream can be withdrawn into the dialysate solution.
Inventors
- 👤 Charles B. Willock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:49
CPC Classifications
A; A61; A61M; A61M1/00; A61M1/14; A61M1/16; A61M1/1621; A61M1/1635; A61M1/1641; Y; Y10; Y10S; Y10S210/00; Y10S210/929
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
86 words
An artificial kidney system comprising a dialyzer having an input and an output for dialyzing solution, pump means for supplying a dialyzing solution to and removing dialyzing solution and ultrafiltrate from said dialyzer at pressures to cause ultrafiltration at a range of desired rates, said pump means including a positive displacement piston and cylinder input pump and a positive displacement piston and cylinder output pump, each having a piston rod projecting from its cylinder, and means connected to said rods for indicating the rate of ultrafiltration.
Claim 2
Dependent Claim
86 words
An artificial kidney system comprising a dialyzer having an input and an output for dialyzing solution, pump means for supplying a dialyzing solution to and removing dialyzing solution and ultrafiltrate from said dialyzer at pressures to cause ultrafiltration at a range of desired rates, said pump means including a positive displacement piston and cylinder input pump and a positive displacement piston and cylinder output pump, each having a piston rod projecting from its cylinder, and means connected to said rods for indicating the rate of ultrafiltration.
Claim 3
Dependent Claim
25 words
An artificial kidney machine as recited in claim 1 in which the last named means adjusts the relative rates of operation of the two pumps.
References Cited (Backward Citations)
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Cited
US3669880A
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US3946731A
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US3844940A
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US4021341A
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US3990973A
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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) | 1982-10-22 | 1983-04-23 | 1983-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-22 | 1987-04-23 | 1987-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-22 | 1991-04-23 | 1991-10-23 | $7700.00 | Window Closed / Lapsed |