Patent US3722680A successfully refreshed from Google Patents.
US3722680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hemodialysis apparatus
Assignee: Individual
•
Filing: 1971-03-17
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Granted: 1973-03-27
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Expires: 1991-03-17
Abstract
Abstract Dialysate delivery apparatus for use with a hemodialyzer provided with a dialysate inlet and a dialysate outlet comprises conduit means coupled to the inlet and outlet of the hemodialyzer as well as to a waste discharge. A fresh dialysate storage reservoir and a used dialysate recirculating reservoir communicate with the conduit means. A fresh dialysate pump is arranged in the conduit means for withdrawing fresh dialysate from the storage reservoir and circulating it to the inlet of the hemodialyzer. A used dialysate pump is arranged in the conduit means for drawing used dialysate from the hemodialyzer and circulating it to the recirculating reservoir. The conduit means also includes valve means which functions to combine a predetermined proportion of the used dialysate with the fresh dialysate being circulated to the inlet of the hemodialyzer, and to circulate a predetermined proportion of the used dialysate to and from the dialyzer as well as to the waste discharge. In this manner maximum economy of dialysate and maximum efficiency of operation of the hemodialyzer are achieved.
Inventors
- 👤 F Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:27
CPC Classifications
A; A61; A61M; A61M1/00; A61M1/14; A61M1/16; A61M1/1694
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
176 words
For use with a hemodialyzer provided with a dialysate inlet and a dialysate outlet, dialysate delivery apparatus comprising: a. infeed and outfeed dialysate conduit means coupled to the inlet and outlet, respectively, of the hemodialyzer, b. a fresh dialysate storage reservoir having an outlet, c. a used dialysate recirculating reservoir having an inlet, an outlet and an overflow to waste, d. first pump means having an inlet coupled to the outlet of the fresh dialysate storage reservoir and an outlet coupled to the infeed conduit means, e. second pump means having an inlet coupled to the outfeed conduit means and to the outlet of the used dialysate recirculating reservoir, and an outlet coupled to the infeed conduit means and to the inlet of the used dialysate recirculating reservoir, whereby to effect mixing of fresh and used dialysate for delivery to the hemodialyzer, and f. control valve means communicating the outlet of the used dialysate recirculating reservoir with the inlet of the second pump means independently of the hemodialyzer for controlling the negative pressure in the hemodialyzer.
Claim 2
Dependent Claim
176 words
For use with a hemodialyzer provided with a dialysate inlet and a dialysate outlet, dialysate delivery apparatus comprising: a. infeed and outfeed dialysate conduit means coupled to the inlet and outlet, respectively, of the hemodialyzer, b. a fresh dialysate storage reservoir having an outlet, c. a used dialysate recirculating reservoir having an inlet, an outlet and an overflow to waste, d. first pump means having an inlet coupled to the outlet of the fresh dialysate storage reservoir and an outlet coupled to the infeed conduit means, e. second pump means having an inlet coupled to the outfeed conduit means and to the outlet of the used dialysate recirculating reservoir, and an outlet coupled to the infeed conduit means and to the inlet of the used dialysate recirculating reservoir, whereby to effect mixing of fresh and used dialysate for delivery to the hemodialyzer, and f. control valve means communicating the outlet of the used dialysate recirculating reservoir with the inlet of the second pump means independently of the hemodialyzer for controlling the negative pressure in the hemodialyzer.
Claim 3
Dependent Claim
49 words
The dialysis delivery apparatus of claim 1 including recirculating conduit means communicating the outlet of the first pump means with the fresh dialysate storage reservoir for recirculating a predetermined amount of fresh dialysate to the dialysate storage reservoir at a velocity calculated to stir the fresh dialysate contents thereof.
Claim 4
Dependent Claim
37 words
The dialysate delivery apparatus of claim 1 including heat exchanger means contained in the used dialysate recirculating reservoir in series relation with the infeed conduit means carrying fresh dialysate from the outlet of the first pump means.
Claim 5
Dependent Claim
34 words
The dialysate delivery apparatus of claim 3 including thermostatically controlled heating means associated with the used dIalysate recirculating reservoir for maintaining the temperature of the used dialysate contents thereof at a predetermined temperature level.
Claim 6
Dependent Claim
25 words
The dialysate delivery apparatus of claim 1 including blood leak detection cell means in series in the outfeed conduit means downstream from the hemodialyzer outlet.
Claim 7
Dependent Claim
30 words
The dialysate delivery apparatus of claim 1 wherein the used dialysate recirculating reservoir has a capacity of less than about 15 percent of that of the fresh dialysate storage reservoir.
Claim 8
Dependent Claim
42 words
The dialysate delivery apparatus of claim 1 including regulating valve means communicating the outlet of the second pump means with the inlet of the used dialysate recirculating reservoir for controlling the proportion of used dialysate recycled to the used dialysate recirculating reservoir.
Claim 9
Dependent Claim
106 words
The dialysate delivery apparatus of claim 1 including first regulating valve means communicating the outlet of the second pump means with the inlet of the used dialysate recirculating reservoir for controlling the proportion of used dialysate recycled to the used dialysate recirculating reservoir, and second regulating valve means communicating the outlet of the first pump means with the fresh dialysate storage reservoir for controlling the proportion of fresh dialysate recycled to the fresh dialysate storage reservoir, said first and second regulating valve means being arranged to balance the outflow pressure of both the first and the second pump means as required to obtain uniform flow therefrom.
Claim 10
Dependent Claim
32 words
The dialysate delivery apparatus of claim 1 including control valve means in the infeed conduit means arranged for controlling the flow of fresh dialysate to the outlet of the second pump means.
Claim 11
Dependent Claim
33 words
The dialysate delivery apparatus of claim 1 including control valve means in the infeed conduit means arranged for controlling the flow of combined fresh and used dialysate to the inlet of the hemodialyzer.
Claim 12
Dependent Claim
215 words
The dialysate delivery apparatus of claim 1 including a. heat exchanger means contained in the used dialysate recirculating reservoir in series relation with the infeed conduit means carrying fresh dialysate from the outlet of the first pump means, b. thermostatically controlled heating means associated with the used dialysate recirculating reservoir for maintaining the temperature of the used dialysate contents thereof at a predetermined temperature level, c. first regulating valve means communicating the outlet of the second pump means with the inlet of the used dialysate recirculating reservoir for controlling the proportion of used dialysate recycled to the used dialysate recirculating reservoir, d. second regulating valve means communicating the outlet of the first pump means with the fresh dialysate storage reservoir for controlling the proportion of fresh dialysate recycled to the fresh dialysate storage reservoir, e. said first and second regulating valve means being arranged to balance the outflow pressure of both the first and second pump means as required to obtain uniform flow therefrom, f. control valve means in the infeed conduit means arranged for controlling the flow of fresh dialysate to the outlet of the second pump means, and g. control valve means in the infeed conduit means for controlling the flow of combined fresh and used dialysate to the inlet of the hemodialyzer.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |