Claims
- 1. An artificial haemodialysis kidney comprising, in combination:
- a. A source of dialysis liquid;
- b. a haemodialyser including a membrane capable of permitting simultaneous dialysis and ultrafiltration of blood;
- c. a chamber on one face of said membrane connectable to a blood stream;
- d. a constant volume closed system in the form of a closed loop having a wall portion formed by a second face of said membrane, said system containing a dialysis liquid;
- e. a circulation pump in said loop downstream of the dialyser;
- f. means for withdrawing by pumping from said constant volume closed system, at a predetermined rate, a fraction of the dialysis liquid so that the volume of liquid in said system is maintained constant;
- g. a two position valve system, movable between a first position in which simultaneously the source of liquid is connected to the constant volume closed system to direct said liquid to said membrane and the liquid having passed said membrane is directed in open circuit to the exterior, and a second position which simultaneously isolates the constant volume closed system from the source and from the exterior to form a closed circuit for the dialysis liquid; and
- h. means for adjusting the pressure difference on either side of the membrane.
- 2. An artificial haemodialysis kidney as claimed in claim 1, further comprising a dialysis liquid regenerator and a second valve enabling connection and disconnection of said generator to said constant volume closed system.
- 3. A method of dialysis together with ultra-filtration of a liquid comprising the steps of providing a constant volume closed system having a wall portion forming a membrane of a dialysis and ultrafiltration apparatus, connecting the face of said membrane remote from said constant volume closed system to the liquid to be dialysed and ultrafiltered, filling said system with a dialysis liquid, circulating the dialysis liquid along said membrane at a flow corresponding to the normal condition of a haemodialysis operation, withdrawing by pumping a fraction of said dialysis liquid from the system at a predetermined desired flow rate, so that the volume of liquid in said system is maintained constant, noting the reduction in pressure then existing in the constant volume closed system near the membrane, switching the operation of said system into open circuit and ajusting the reduced pressure to the value noted.
Priority Claims (1)
Number |
Date |
Country |
Kind |
72.27582 |
Jul 1972 |
FR |
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Parent Case Info
This is a continuation of application Ser. No. 384,286 filed July 31, 1973, now abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
3669880 |
Marantz et al. |
Jun 1972 |
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3795318 |
Crane et al. |
Mar 1974 |
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Continuations (1)
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Number |
Date |
Country |
Parent |
384286 |
Jul 1973 |
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