Medical treatment system and methods using a plurality of fluid lines
First Claim
1. A dialysis system comprising:
- a pumping cassette having a generally planar body and a first flexible membrane on a side of the cassette having a pumping chamber portion overlying a pumping chamber on the cassette; and
a cycler having a control surface including a second flexible membrane having a movable portion arranged to contact and mate with the pumping chamber portion of the first flexible membrane, the cycler being arranged to control pneumatic pressure on a side of the movable portion of the second flexible membrane to move the movable portion of the second flexible membrane while mated with the pumping chamber portion of the first flexible membrane and thereby to move the pumping chamber portion of the first flexible membrane to cause fluid flow in the pumping chamber, the cycler further including at least one port at the control surface arranged to apply vacuum to remove fluid from a space between the pumping chamber portion of the first flexible membrane and the movable portion of the second flexible membrane to draw the pumping chamber portion and the movable portion toward each other such that the pumping chamber portion and the movable portion remain continuously mated and in contact so as to move with each other while causing fluid flow in the pumping chamber, the at least one port also arranged to introduce fluid into the space to move the first and second flexible membranes away from each other when separating the pumping cassette from the cycler;
the cycler further including a fluid trap in fluid communication with the at least one port and arranged to collect liquid that leaks from the pumping cassette and enters between the first flexible membrane and second flexible membrane, and in valved fluid communication with a positive pressure source and a negative pressure source for introduction or removal of said fluid with respect to said space;
wherein the pumping cassette including the first flexible membrane is separable from the cycler including the second flexible membrane, and the fluid trap includes a liquid detector.
3 Assignments
0 Petitions
Accused Products
Abstract
A medical treatment system, such as peritoneal dialysis system, may include control and other features to enhance patient comfort and ease of use. A fluid trap of a peritoneal dialysis cycler may have a valved connection to a vacuum source or a positive pressure source. The fluid trap can be connected to the vacuum source in order to sealingly engage a flexible membrane of a pumping cassette to a control surface of the cycler during a therapy. Any fluid entering a space between the membrane and control surface can be drawn away and collected in the fluid trap. The fluid trap alternatively can be connected to a positive pressure source in order to aid in separating the membrane from the control surface to facilitate removal of the pumping cassette from the cycler. The fluid trap may include a liquid detection sensor.
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Citations
22 Claims
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1. A dialysis system comprising:
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a pumping cassette having a generally planar body and a first flexible membrane on a side of the cassette having a pumping chamber portion overlying a pumping chamber on the cassette; and a cycler having a control surface including a second flexible membrane having a movable portion arranged to contact and mate with the pumping chamber portion of the first flexible membrane, the cycler being arranged to control pneumatic pressure on a side of the movable portion of the second flexible membrane to move the movable portion of the second flexible membrane while mated with the pumping chamber portion of the first flexible membrane and thereby to move the pumping chamber portion of the first flexible membrane to cause fluid flow in the pumping chamber, the cycler further including at least one port at the control surface arranged to apply vacuum to remove fluid from a space between the pumping chamber portion of the first flexible membrane and the movable portion of the second flexible membrane to draw the pumping chamber portion and the movable portion toward each other such that the pumping chamber portion and the movable portion remain continuously mated and in contact so as to move with each other while causing fluid flow in the pumping chamber, the at least one port also arranged to introduce fluid into the space to move the first and second flexible membranes away from each other when separating the pumping cassette from the cycler; the cycler further including a fluid trap in fluid communication with the at least one port and arranged to collect liquid that leaks from the pumping cassette and enters between the first flexible membrane and second flexible membrane, and in valved fluid communication with a positive pressure source and a negative pressure source for introduction or removal of said fluid with respect to said space; wherein the pumping cassette including the first flexible membrane is separable from the cycler including the second flexible membrane, and the fluid trap includes a liquid detector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A dialysis system comprising:
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a pumping cassette having a generally planar body and a first flexible membrane on a side of the cassette having a pumping chamber portion overlying a pumping chamber on the cassette; and a cycler having a control surface including a second flexible membrane having a movable portion arranged to contact and mate with the pumping chamber portion of the first flexible membrane, the cycler being arranged to control pneumatic pressure on a side of the movable portion of the second flexible membrane to move the movable portion of the second flexible membrane while mated with the pumping chamber portion of the first flexible membrane and thereby to move the pumping chamber portion of the first flexible membrane to cause fluid flow in the pumping chamber, the cycler further including at least one port at the control surface arranged to apply vacuum to remove fluid from a space between the pumping chamber portion of the first flexible membrane and the movable portion of the second flexible membrane to draw the pumping chamber portion and the movable portion toward each other such that the pumping chamber portion and the movable portion remain continuously mated and in contact as to move with each other while causing fluid flow in the pumping chamber, the at least one port also arranged to introduce fluid into the space to move the first and second flexible membranes away from each other when separating the pumping cassette from the cycler; the cycler further including a fluid trap in fluid communication with the at least one port and arranged to collect liquid that leaks from the pumping cassette and enters between the first flexible membrane and second flexible membrane, and in valved fluid communication with a positive pressure source and a negative pressure source for introduction or removal of said fluid with respect to said space; and a pressure sensor in fluid communication with the fluid trap, wherein the pumping cassette including the first flexible membrane is separable from the cycler including the second flexible membrane. - View Dependent Claims (19, 20, 21, 22)
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Specification