Hemodialysis device
First Claim
1. A hemodialysis apparatus comprising:
- a dialyzer having a membrane, a first chamber, and a second chamber separated from said first chamber by said membrane, said first chamber for coupling into a dialyzing liquid path, and said second chamber for coupling into a blood path;
a dialyzing liquid source;
a suction pump disposed in the dialyzing liquid path downstream from the dialyzer for controlling transmembrane pressure in the dialyzer;
a restrictor means disposed in the dialyzing liquid path upstream of the dialyzer;
a changeover valve having a first outlet, a second outlet, and an inlet coupled to receive dialyzing liquid downstream from said suction pump;
a discharge port coupled to said first outlet;
volume-measuring means for measuring volume of ultrafiltrate liquid;
means for determining the transmembrane pressure in the dialyzer;
control means, said control means being coupled at least to the transmembrane pressure determining means for controlling the suction pump in response to transmembrane pressure; and
a return line coupled to said second outlet of said first changeover valve and connected to the dialyzing liquid source for returning the dialyzing liquid to the dialyzing liquid source in a closed circuit.
1 Assignment
0 Petitions
Accused Products
Abstract
Hemodialysis device (10) with a control apparatus (74) and a line (52) which is connected to a valve arrangement (50) downstream of the suction pump (20) and to a dialyzing liquid source (16). The dialyzing liquid source (16) has a volume measuring apparatus (54, 58) with which the ultrafiltrate generated by the suction pump (20) can be determined in the recirculation circuit. The ultrafiltration rate thereby established serves to control the suction pump (20) with the aid of the control apparatus (74), in some cases the transmembrane pressure being determined with the aid of the pressure gauges (62, 66) and from which the current ultrafiltration coefficient can be measured. Furthermore, the hemodialysis device (10) has a safe possibility of feeding disinfectant concentrate into the recirculation circuit downstream of the dialyzer (12).
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Citations
7 Claims
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1. A hemodialysis apparatus comprising:
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a dialyzer having a membrane, a first chamber, and a second chamber separated from said first chamber by said membrane, said first chamber for coupling into a dialyzing liquid path, and said second chamber for coupling into a blood path; a dialyzing liquid source; a suction pump disposed in the dialyzing liquid path downstream from the dialyzer for controlling transmembrane pressure in the dialyzer; a restrictor means disposed in the dialyzing liquid path upstream of the dialyzer; a changeover valve having a first outlet, a second outlet, and an inlet coupled to receive dialyzing liquid downstream from said suction pump; a discharge port coupled to said first outlet; volume-measuring means for measuring volume of ultrafiltrate liquid; means for determining the transmembrane pressure in the dialyzer; control means, said control means being coupled at least to the transmembrane pressure determining means for controlling the suction pump in response to transmembrane pressure; and a return line coupled to said second outlet of said first changeover valve and connected to the dialyzing liquid source for returning the dialyzing liquid to the dialyzing liquid source in a closed circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification