Dialysate preparation system
First Claim
1. A central system for continuously preparing dialysate for a plurality of dialysis patient stations comprising:
- a source of water under pressure,a proportioning pump for mixing said water under pressure with concentrate to form dialysate under pressure,a regulator valve connected between said source of water and said proportioning pump, andvolume sensing means connected between said proportioning pump and said patient station, said volume sensing means being connected to said regulator valve to control the pressure of the dialysate supplied to said patient station at a constant pressure for different flow rates of dialysate to said patient station.
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Accused Products
Abstract
A system continuously prepares dialysate by mixing water under pressure with concentrate to form dialysate under pressure. This dialysate is supplied on demand to a single patient station or to a plurality of patient stations. The pressure at which this dialysate is supplied to multiple patient stations is controlled so changes in the flow to one station will not change the pressure at which dialysate is supplied to other stations. A pressure regulator senses the pressure of the dialysate supplied to the patient stations and controls a regulator valve connected between the source of water under pressure and a proportioning pump which mixes this water with concentrate. The regulator includes a constant force spring assembly which provides a constant bias against the pressure in a sensing chamber over a range of linear movement of the pressure sensing element.
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Citations
12 Claims
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1. A central system for continuously preparing dialysate for a plurality of dialysis patient stations comprising:
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a source of water under pressure, a proportioning pump for mixing said water under pressure with concentrate to form dialysate under pressure, a regulator valve connected between said source of water and said proportioning pump, and volume sensing means connected between said proportioning pump and said patient station, said volume sensing means being connected to said regulator valve to control the pressure of the dialysate supplied to said patient station at a constant pressure for different flow rates of dialysate to said patient station. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for continuously preparing dialysate for a dialysis patient station comprising:
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a source of water under pressure, a proportioning pump for mixing said water under pressure with concentrate to form dialysate under pressure including a double acting piston enclosed in a center cylinder, and a pair of end cylinders with pistons therein disposed on either side of said cylinder, said water under pressure being alternately supplied to and discharged from said center cylinder as said piston reciprocates, said concentrate being alternately supplied to and discharged from said end cylinders as said piston reciprocates, means for controlling the pressure at which said water is supplied to said center cylinder, a closed mixing vessel connected between said proportioning pump and said patient station, concentrate and water from said proportioning pump being supplied to said mixing vessel, an outlet to said patient stations positioned in approximately the vertical center of said mixing vessel so that resumed flow of dialysate to said patient stations has correct concentration, and an air bleed line connected from the top of said mixing vessel to said outlet. - View Dependent Claims (12)
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Specification