US4412917A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Weight controlled and hydrostatic pressure adjustable peritoneal dialysis apparatus
Assignee: Instrumentarium Oyj
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Filing: 1981-05-22
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Granted: 1983-11-01
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Expires: 2001-05-22
Abstract
Abstract An apparatus for peritoneal dialysis including a first vessel to contain dialysis fluid and a second vessel to contain spent dialysis fluid. The first and second vessels are connected through a conduit means with the abdominal cavity of a patient, and a pump is located in the conduit means between the first vessel and the abdominal cavity to pump dialysis fluid into the cavity, while a flow control means, such as a valve, is located in the conduit means between the abdominal cavity and the second vessel to control the flow of dialysis fluid being removed from the patient. A branch conduit interconnects the conduit means at a location between the first vessel and the abdominal cavity and the branch conduit is provided with a third overflow vessel located at a higher level than the abdominal cavity. A weighing mechanism is provided for weighing all three vessels, and a control unit is responsive to the weight as determined by the weighing mechanism for controlling operation of the pump and the valve means to obtain the desired flow of dialysis fluid through the conduit means.
Inventors
- 👤 Hannu T. Ahjopalo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:18
CPC Classifications
A; A61; A61M; A61M1/00; A61M1/14; A61M1/28; A61M1/16; A61M1/1621; A61M1/1643; A61M1/282; A61M1/284; A61M2205/00; A61M2205/33; A61M2205/3379; A61M2205/3393
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
200 words
An apparatus for peritoneal dialysis, comprising a first vessel to contain a dialysis fluid; a second vessel to contain spent dialysis fluid; conduit means for interconnecting said first and second vessels with the abdominal cavity of a patient; pumping means in said conduit means for pumping the dialysis fluid directly into the abdominal cavity; flow control means in said conduit means for controlling the amount of dialysis fluid removed from said abdominal cavity; a branch conduit interconnected with said conduit means at a location between said pumping means and said abdominal cavity and having a hydrostatic pressure equalizing section disposed at a higher level than said abdominal cavity, said pumping means and conduit means providing fluid flow into the abdominal cavity simultaneously with pumping against hydrostatic liquid pressure in said pressure equalizing section; weighing means for measuring the weight of said first vessel, said second vessel, and said equalizing section; and control means operably connected to said pumping means and to said flow control means and responsive to the weight as determined by said weighing means for controlling the operation of said pumping means and said flow control means to obtain the desired flow of fluid through said conduit means.
Claim 2
Independent Claim
200 words
An apparatus for peritoneal dialysis, comprising a first vessel to contain a dialysis fluid; a second vessel to contain spent dialysis fluid; conduit means for interconnecting said first and second vessels with the abdominal cavity of a patient; pumping means in said conduit means for pumping the dialysis fluid directly into the abdominal cavity; flow control means in said conduit means for controlling the amount of dialysis fluid removed from said abdominal cavity; a branch conduit interconnected with said conduit means at a location between said pumping means and said abdominal cavity and having a hydrostatic pressure equalizing section disposed at a higher level than said abdominal cavity, said pumping means and conduit means providing fluid flow into the abdominal cavity simultaneously with pumping against hydrostatic liquid pressure in said pressure equalizing section; weighing means for measuring the weight of said first vessel, said second vessel, and said equalizing section; and control means operably connected to said pumping means and to said flow control means and responsive to the weight as determined by said weighing means for controlling the operation of said pumping means and said flow control means to obtain the desired flow of fluid through said conduit means.
Claim 3
Dependent Claim
23 words
The apparatus of claim 1, wherein said pump means is disposed in said conduit means between said first vessel and said branch conduit.
Claim 4
Dependent Claim
42 words
The apparatus of claim 1, and including heating means for heating said dialysis fluid, said heating means being located in said conduit means between said first vessel and said abdominal cavity for heating the fluid as it flows through said conduit means.
Claim 5
Dependent Claim
23 words
The apparatus of claim 1, and including pressure regulating means for regulating the pressure of the dialysis fluid introduced into said abdominal cavity.
Claim 6
Dependent Claim
27 words
The apparatus of claim 4, wherein said pressure regulating means includes means for adjusting the vertical position of said pressure equalizing section relative to said abdominal cavity.
Claim 7
Dependent Claim
14 words
The apparatus of claim 1, wherein said pressure equalizing section comprises a third vessel.
Claim 8
Dependent Claim
35 words
The apparatus of claim 6, and including sensing means operably connected to said control means and responsive to a predetermined level of dialysis fluid in said third vessel for controlling operation of said pumping means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-31 | 1987-05-02 | 1987-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-31 | 1991-05-02 | 1991-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-31 | 1995-05-02 | 1995-11-01 | $7700.00 | Window Closed / Lapsed |