Artificial kidney device
First Claim
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1. An artificial kidney device for a human being comprising:
- a dialyzer for removing specified components from blood;
blood pumping means for transporting blood from an artery of the human being to the dialyzer and creating a blood pressure in the dialyzer above arterial pressure;
means forming a flow passage in communication with said dialyzer for transporting blood passed through the dialyzer to a vein of the human being;
means for maintaining a substantially constant ultrafiltration pressure in said dialyzer including an inner tube forming part of said flow passage and an outer tube surrounding said inner tube and defining a closed chamber therewith, the pressure within said inner tube being subject to change in accordance with prevailing blood pressure in said dialyzer; and
means for applying and maintaining a substantially constant predetermined pressure in excess of atmospheric pressure within said closed chamber;
said inner tube being formed of material deformable in response to changes in pressure within said inner tube and the pressure differentials created thereby between the inside of said inner tube and said chamber to enlarge or restrict said flow passage through said inner tube so that the pressure inside said inner tube will balance the substantially constant predetermined pressure in said closed chamber to thereby maintain said ultrafiltration pressure in the dialyzer substantially constant.
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Abstract
An artificial kidney device is provided with a dialyzer for separating specified components from blood. A double walled tube is mounted midway of a tube provided for transporting the blood passed through the dialyzer into a vein of a human being, so as to automatically maintain an ultrafiltration pressure substantially constant. The double-tube wall consists of a flexible inner tube and a non-flexible outer tube and is adapted to automatically collapse or inflate the inner tube in response to a change in pressure prevailing within the dialyzer, by applying a predetermined pressure to a closed chamber defined between the inner tube and the outer tube.
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Citations
14 Claims
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1. An artificial kidney device for a human being comprising:
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a dialyzer for removing specified components from blood; blood pumping means for transporting blood from an artery of the human being to the dialyzer and creating a blood pressure in the dialyzer above arterial pressure; means forming a flow passage in communication with said dialyzer for transporting blood passed through the dialyzer to a vein of the human being; means for maintaining a substantially constant ultrafiltration pressure in said dialyzer including an inner tube forming part of said flow passage and an outer tube surrounding said inner tube and defining a closed chamber therewith, the pressure within said inner tube being subject to change in accordance with prevailing blood pressure in said dialyzer; and means for applying and maintaining a substantially constant predetermined pressure in excess of atmospheric pressure within said closed chamber; said inner tube being formed of material deformable in response to changes in pressure within said inner tube and the pressure differentials created thereby between the inside of said inner tube and said chamber to enlarge or restrict said flow passage through said inner tube so that the pressure inside said inner tube will balance the substantially constant predetermined pressure in said closed chamber to thereby maintain said ultrafiltration pressure in the dialyzer substantially constant. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification