PERITONEAL DIALYSIS MACHINE
First Claim
1. A peritoneal dialysis machine comprising:
- a housing;
a mechanically actuated piston head extending from a pump actuator housed by the housing, the mechanically actuated piston head positioned to extend towards and away from a fluid pumping cassette, the fluid pumping cassette coupled operably to the housing such that a flexible membrane of the fluid pumping cassette faces the piston head;
a pressure sensor positioned by the housing adjacent to the mechanically actuated piston head so as to sense a pressure of a medical fluid moved by the mechanically actuated piston head within the fluid pumping cassette; and
a vacuum chamber formed about the mechanically actuated piston head, the vacuum chamber holding a vacuum that sucks the flexible membrane of the fluid pumping cassette onto the mechanically actuated piston head as the mechanically actuated piston head extends away from the fluid pumping cassette.
2 Assignments
0 Petitions
Accused Products
Abstract
A peritoneal dialysis machine including: a housing; a mechanically actuated piston head extending from a pump actuator housed by the housing, the mechanically actuated piston head positioned to extend towards and away from a fluid pumping cassette, the fluid pumping cassette coupled operably to the housing such that a flexible membrane of the fluid pumping cassette faces the piston head; a pressure sensor positioned by the housing adjacent to the mechanically actuated piston head so as to sense a pressure of a medical fluid moved by the mechanically actuated piston head within the fluid pumping cassette; and a vacuum chamber formed about the mechanically actuated piston head, the vacuum chamber holding a vacuum that sucks the flexible membrane of the fluid pumping cassette onto the mechanically actuated piston head as the mechanically actuated piston head extends away from the fluid pumping cassette.
171 Citations
21 Claims
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1. A peritoneal dialysis machine comprising:
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a housing; a mechanically actuated piston head extending from a pump actuator housed by the housing, the mechanically actuated piston head positioned to extend towards and away from a fluid pumping cassette, the fluid pumping cassette coupled operably to the housing such that a flexible membrane of the fluid pumping cassette faces the piston head; a pressure sensor positioned by the housing adjacent to the mechanically actuated piston head so as to sense a pressure of a medical fluid moved by the mechanically actuated piston head within the fluid pumping cassette; and a vacuum chamber formed about the mechanically actuated piston head, the vacuum chamber holding a vacuum that sucks the flexible membrane of the fluid pumping cassette onto the mechanically actuated piston head as the mechanically actuated piston head extends away from the fluid pumping cassette. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A peritoneal dialysis machine comprising:
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a mechanically actuated piston head extending from a pump actuator, the mechanically actuated piston head positioned to extend towards and away from a fluid pumping cassette coupled operably to the machine such that a flexible membrane of the pumping cassette faces the piston head; a pressure sensor positioned adjacent the mechanically actuated piston head so as to sense a pressure of a medical fluid moved by the mechanically actuated piston head within the fluid pumping cassette; a vacuum chamber formed about the mechanically actuated piston head, the vacuum chamber holding a vacuum that sucks the flexible membrane of the fluid pumping cassette onto the mechanically actuated piston head as the mechanically actuated piston head extends away from the fluid pumping cassette; and a line occlusion test performed by the machine in which a line occlusion is determined if the pressure sensor detects a particular pressure rise when the piston head is extending towards the cassette to push the medical fluid out the cassette. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A peritoneal dialysis machine comprising:
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a mechanically actuated piston head extending from a pump actuator, the mechanically actuated piston head positioned to extend towards and away from a fluid pumping cassette coupled operably to the machine such that a flexible membrane of the pumping cassette faces the piston head; a fluid valve positioned adjacent to the piston head and operable with the fluid pumping cassette; a vacuum chamber formed about the mechanically actuated piston head, the vacuum chamber holding a vacuum that sucks the flexible membrane of the fluid pumping cassette onto the mechanically actuated piston head as the mechanically actuated piston head extends away from the fluid pumping cassette; and a priming procedure performed by the machine in which a position of the mechanically actuated piston head is monitored to determine when to open the fluid valve to allow communication between a pump chamber portion of the fluid pumping cassette and a line extending from the fluid pumping cassette being primed. - View Dependent Claims (19)
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20. A peritoneal dialysis machine comprising:
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a mechanically actuated piston head extending from a pump actuator, the mechanically actuated piston head positioned to extend towards and away from a fluid pumping cassette coupled operably to the machine such that a flexible membrane of the pumping cassette faces the piston head; a pressure sensor positioned adjacent the mechanically actuated piston head so as to sense a pressure of a medical fluid moved by the mechanically actuated piston head within the fluid pumping cassette; a vacuum chamber formed about the mechanically actuated piston head, the vacuum chamber holding a vacuum that sucks the flexible membrane of the fluid pumping cassette onto the mechanically actuated piston head as the mechanically actuated piston head extends away from the fluid pumping cassette; and a leak test performed by monitoring a position of the mechanically operated piston head while causing the mechanically operated piston head to apply a constant force to the flexible membrane of the fluid pumping cassette when it is expected that the mechanically operated piston head will be held stationary. - View Dependent Claims (21)
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Specification