Hemodialysis apparatus
First Claim
1. A hemodialysis apparatus, comprising:
- (a) dialyzer means, and dialysis solution supply means,(b) balancing chamber means having a defined volume(c) sealing means movably supported in said defined volume, said sealing means separating said defined volume into two chamber components each having respective inlet and outlet means said inlet and outlet means being operatively connected to said dialyzer means and to said dialysis solution supply means,(d) controllable valve means operatively connected to said inlet and outlet means for controlling the inflow to and the outflow from said chamber components,(e) control means operatively connected to said controllable valve means for supplying, in a first operational phase, fresh dialysis solution into one of said chamber components while discharging used dialysis solution from the other chamber component, and for transferring, in a second operational phase fresh dialysis solution from said one chamber component into said dialyzer while supplying used dialysis solution from the dialyzer into said other chamber component,(f) sensor means operatively arranged for sensing end positions of said sealing means, said sensor means being operatively connected to said control means, for controlling the sequencing of said first and second operational phases and vice versa in response to said sealing means reaching its end positions,(g) adjustable means (7) operatively connected to said dialyzer means for withdrawing measured quantities of ultrafiltrate from said dialyzer means, and indicator means connected to said withdrawing means for indicating the quantity of withdrawn ultrafiltrate,(h) said dialysis solution supply means including mixing means connected to a source of water and a source of dialysis concentrate and having an output operatively connected to said one chamber component for filling the latter,(i) dosing means operatively connected to said mixing means for supplying said dialysis concentrate to said mixing means, said control means being also operatively connected to said dosing means for controlling the dosing means also in response to said sealing means reaching its end positions,(j) and means operatively connected to said hemodialysis apparatus for monitoring the concentration of said dialysis solution.
0 Assignments
0 Petitions
Accused Products
Abstract
The ultra-filtration in a hemodialysis operation is controlled by a control apparatus which is connected to a balancing device (1) and to a dosing device (9) to form a closed loop control circuit for the metered supply of dialysis concentrate into the balancing device and for the metered supply of fresh dialysis solution into the dialyzer. The closed loop control circuit controls the alternating supply of fresh dialysis solution into one chamber of a balancing device and the withdrawal of used-up dialysis solution from the other chamber of the balancing device. The closed loop control circuit also controls a pump for the metered withdrawal of used-up dialysis solution out of the dialysis circulatory system. The dosing device operates as a proportionality device to produce fresh dialysis solution from water and dialysis concentrate whereby the concentrate is dosed and the dialysis solution is also dosed or metered.
302 Citations
14 Claims
-
1. A hemodialysis apparatus, comprising:
-
(a) dialyzer means, and dialysis solution supply means, (b) balancing chamber means having a defined volume (c) sealing means movably supported in said defined volume, said sealing means separating said defined volume into two chamber components each having respective inlet and outlet means said inlet and outlet means being operatively connected to said dialyzer means and to said dialysis solution supply means, (d) controllable valve means operatively connected to said inlet and outlet means for controlling the inflow to and the outflow from said chamber components, (e) control means operatively connected to said controllable valve means for supplying, in a first operational phase, fresh dialysis solution into one of said chamber components while discharging used dialysis solution from the other chamber component, and for transferring, in a second operational phase fresh dialysis solution from said one chamber component into said dialyzer while supplying used dialysis solution from the dialyzer into said other chamber component, (f) sensor means operatively arranged for sensing end positions of said sealing means, said sensor means being operatively connected to said control means, for controlling the sequencing of said first and second operational phases and vice versa in response to said sealing means reaching its end positions, (g) adjustable means (7) operatively connected to said dialyzer means for withdrawing measured quantities of ultrafiltrate from said dialyzer means, and indicator means connected to said withdrawing means for indicating the quantity of withdrawn ultrafiltrate, (h) said dialysis solution supply means including mixing means connected to a source of water and a source of dialysis concentrate and having an output operatively connected to said one chamber component for filling the latter, (i) dosing means operatively connected to said mixing means for supplying said dialysis concentrate to said mixing means, said control means being also operatively connected to said dosing means for controlling the dosing means also in response to said sealing means reaching its end positions, (j) and means operatively connected to said hemodialysis apparatus for monitoring the concentration of said dialysis solution. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
Specification