Medical fluid pump
First Claim
1. A pump for a dialysis system comprising:
- a first chamber wall including a first aperture;
a second chamber wall including a second aperture;
a piston, at least a portion of which can move through the second aperture, the piston including a third aperture; and
first and second membranes disposed between the first and second chambers walls, wherein a vacuum can be applied through the first aperture to pull the first membrane towards the first chamber wall and can be applied through the third aperture to pull the second membrane towards the piston, wherein the piston can thereafter move the second membrane.
3 Assignments
0 Petitions
Accused Products
Abstract
A method, system and apparatus for performing peritoneal dialysis are provided. To this end, in part, a pump for a dialysis system is provided. The pump includes a first chamber wall including a first aperture, a second chamber wall including a second aperture, a piston, at least a portion of which can move through the second aperture, the piston including a third aperture, and first and second membranes disposed between the first and second chambers walls. A vacuum can be applied through the first aperture to pull the first membrane towards the first chamber wall and can be applied through the third aperture to pull the second membrane towards the piston. The piston can thereafter move the second membrane.
322 Citations
24 Claims
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1. A pump for a dialysis system comprising:
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a first chamber wall including a first aperture;
a second chamber wall including a second aperture;
a piston, at least a portion of which can move through the second aperture, the piston including a third aperture; and
first and second membranes disposed between the first and second chambers walls, wherein a vacuum can be applied through the first aperture to pull the first membrane towards the first chamber wall and can be applied through the third aperture to pull the second membrane towards the piston, wherein the piston can thereafter move the second membrane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A pump for use in a system for providing dialysis treatment comprising:
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a first chamber wall;
a second chamber wall, the second chamber wall defining an aperture;
first and second fluid receiving membranes disposed between the first and second chamber walls; and
a piston, at least a portion of which moves through the aperture, the piston including a piston head having an external shape substantially similar to a mating internal shape of the first chamber wall. - View Dependent Claims (13, 14, 15)
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16. A method of operating a pump for use in a medical treatment comprising the steps of:
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pneumatically pulling on an outer surface of each of two fluid receiving membranes; and
mechanically pushing a first one of the membranes. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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24. An automated dialysis system comprising:
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a disposable dialysis unit placed into a housing, the unit including at least one membrane;
a pump for pumping dialysate, the pump cooperating with the membrane and including;
a first chamber wall including a first aperture;
a second chamber wall including a second aperture;
a piston, at least a portion of which moves through the second aperture, the piston including a third aperture; and
first and second membranes disposed between the first and second chambers walls, wherein a vacuum can be applied through the first aperture to pull the first membrane towards the first chamber wall and can be applied through the third aperture to pull the second membrane towards the piston, wherein the piston can thereafter move the second membrane.
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Specification