Water pressure regulator for hemodialysis apparatus
First Claim
1. In a hemodialysis apparatus having means for supplying heated water under pressure in which said water is subject to pressure and flow transients, a deaeration and pressure regulating system isolated from said pressure transients, comprising:
- (a) deaeration pressure regulating means connected to receive said heated water for regulating a negative pressure of said heated water;
(b) deaeration means having an input connected to said deaeration pressure regulator to receive said heated water under negative pressure for removing air therefrom, and an outlet for deaerated water;
(c) pump means, having an input connected to said outlet to receive deaerated water from said deaeration means, for producing said negative pressure; and
(d) back pressure regulating means having(i) a housing having an inlet connected to said output of said pump means, an outlet connected to said deaeration pressure regulating means, and an outlet connected to supply a flow of said heated deaerated water to said hemodialysis apparatus at a first flow rate,(ii) a valve seat and valve, said valve operatively connected to a diaphragm in said housing; and
(iii) biasing and adjustment means operatively connected to said diaphragm for adjusting said pressure of said circulating heated water, said back pressure regulating means connected to an output of said pump means and to said deaeration pressure regulating means, whereby said deaeration pressure regulator means, said deaeration means, said pump means and said back pressure means form a deaeration loop, said back pressure means for controlling the pressure of said heated water circulating in said deaeration loop independently of the regulated pressure of said water from said source, said back pressure regulating means having an output for providing said hemodialysis apparatus with heated deaerated water at a constant pressure.
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Accused Products
Abstract
A pressure regulating system for a hemodialysis machine utilizes a deaeration pump and a regulator in a deaeration loop for minimizing pressure and flow transients in a heated water supply. The deaeration loop has the pump, a deaeration pressure regulator, a deaerator, and a back pressure regulator. The pump produces a negative pressure in heated water entering the deaeration pressure regulator to circulate the water in the deaeration loop and to enhance removal of air from the water. The back pressure regulator controls the loop water pressure to a value greater than the incoming water pressure and supplies water to the dialyzer system of the machine isolated from supply water pressure and flow variations.
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Citations
6 Claims
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1. In a hemodialysis apparatus having means for supplying heated water under pressure in which said water is subject to pressure and flow transients, a deaeration and pressure regulating system isolated from said pressure transients, comprising:
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(a) deaeration pressure regulating means connected to receive said heated water for regulating a negative pressure of said heated water; (b) deaeration means having an input connected to said deaeration pressure regulator to receive said heated water under negative pressure for removing air therefrom, and an outlet for deaerated water; (c) pump means, having an input connected to said outlet to receive deaerated water from said deaeration means, for producing said negative pressure; and (d) back pressure regulating means having (i) a housing having an inlet connected to said output of said pump means, an outlet connected to said deaeration pressure regulating means, and an outlet connected to supply a flow of said heated deaerated water to said hemodialysis apparatus at a first flow rate, (ii) a valve seat and valve, said valve operatively connected to a diaphragm in said housing; and (iii) biasing and adjustment means operatively connected to said diaphragm for adjusting said pressure of said circulating heated water, said back pressure regulating means connected to an output of said pump means and to said deaeration pressure regulating means, whereby said deaeration pressure regulator means, said deaeration means, said pump means and said back pressure means form a deaeration loop, said back pressure means for controlling the pressure of said heated water circulating in said deaeration loop independently of the regulated pressure of said water from said source, said back pressure regulating means having an output for providing said hemodialysis apparatus with heated deaerated water at a constant pressure. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification