Artificial kidney and a method of ultrafiltering a liquid
First Claim
1. A method of ultrafiltration of a liquid comprising the steps of providing a constant volume closed system having a wall portion forming a membrane of an ultrafiltration apparatus, connecting the face of the membrane remote from said constant volume closed system to the liquid to be ultrafiltered, filling said system with a dialysis liquid, circulating the dialysis liquid along said membrane at a flow rate corresponding to the normal conditions of a haemodialysis operation and withdrawing by pumping a fraction of said dialysis liquid from the system at a predetermined rate, so that the volume of liquid in said system is maintained constant.
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Accused Products
Abstract
A method of ultrafiltration and an artificial kidney therefor, in which a membrane which is capable of simultaneous ultrafiltration and dialysis of blood is arranged to form a portion of the wall of a constant volume, closed loop vessel. A dialysis liquid is circulated in the vessel, while blood is passed on the opposite face of the membrane, and a fraction of the dialysis liquid is withdrawn from the vessel at a predetermined rate. The remainder of the dialysis liquid is kept at a constant temperature and is regenerated.
151 Citations
12 Claims
- 1. A method of ultrafiltration of a liquid comprising the steps of providing a constant volume closed system having a wall portion forming a membrane of an ultrafiltration apparatus, connecting the face of the membrane remote from said constant volume closed system to the liquid to be ultrafiltered, filling said system with a dialysis liquid, circulating the dialysis liquid along said membrane at a flow rate corresponding to the normal conditions of a haemodialysis operation and withdrawing by pumping a fraction of said dialysis liquid from the system at a predetermined rate, so that the volume of liquid in said system is maintained constant.
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8. An artificial kidney comprising, in combination:
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a. a haemodialyser including a membrane capable of permitting simultaneous dialysis and ultrafiltration of blood; b. a chamber on one face of said membrance connectable to a blood stream; c. a constant volume closed system, having a wall portion formed by said membrane, said system containing a dialysis liquid; d. means for circulating the dialysis liquid along said membrane at a flow rate corresponding to the normal conditions of a haemodialysis operation; and e. 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 the system is maintained constant. - View Dependent Claims (9, 10, 11, 12)
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Specification