STEPPER MOTOR DRIVEN PERITONEAL DIALYSIS MACHINE
First Claim
1. A peritoneal dialysis system comprising:
- an enclosure including an actuation surface and a door;
a stepper motor housed by the enclosure;
a pump head and a solid pump piston structurally linking the pump head to the stepper motor; and
a disposable unit accepted by the enclosure, the disposable unit including a flexible membrane attached to a rigid piece, the actuation surface of the enclosure and the disposable unit so configured and arranged that when the stepper motor turns and consequently translates the solid pump piston and the pump head towards the door, the pump head physically contacts and stretches the membrane from a relaxed position to a stretched position, and when the stepper motor turns and consequently translates the solid pump piston and the pump head away from the door, the membrane follows the pump head and transitions from the stretched position to the relaxed position.
1 Assignment
0 Petitions
Accused Products
Abstract
A peritoneal dialysis system includes: an enclosure including an actuation surface and a door; a stepper motor housed by the enclosure; a pump head and a solid pump piston structurally linking the pump head to the stepper motor; and a disposable unit accepted by the enclosure, the disposable unit including a flexible membrane attached to a rigid piece, the actuation surface of the enclosure and the disposable unit so configured and arranged that when the stepper motor turns and consequently translates the solid pump piston and the pump head towards the door, the pump head physically contacts and stretches the membrane from a relaxed position to a stretched position, and when the stepper motor turns and consequently translates the solid pump piston and the pump head away from the door, the membrane follows the pump head and transitions from the stretched position to the relaxed position.
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Citations
21 Claims
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1. A peritoneal dialysis system comprising:
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an enclosure including an actuation surface and a door; a stepper motor housed by the enclosure; a pump head and a solid pump piston structurally linking the pump head to the stepper motor; and a disposable unit accepted by the enclosure, the disposable unit including a flexible membrane attached to a rigid piece, the actuation surface of the enclosure and the disposable unit so configured and arranged that when the stepper motor turns and consequently translates the solid pump piston and the pump head towards the door, the pump head physically contacts and stretches the membrane from a relaxed position to a stretched position, and when the stepper motor turns and consequently translates the solid pump piston and the pump head away from the door, the membrane follows the pump head and transitions from the stretched position to the relaxed position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A peritoneal dialysis system comprising:
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an enclosure including an actuation surface and door; a stepper motor housed by the enclosure; a pump head and a solid pump piston structurally linking the pump head to the stepper motor; and a disposable unit including a flexible membrane attached to a rigid piece, wherein the enclosure accepts the disposable unit so that (i) the flexible membrane in an unstressed state lies between the door and the actuation surface with the pump head lying between the flexible membrane and the actuation surface, and (ii) the pump head in a fully retracted position forms a gap between the pump head and the flexible membrane, wherein the gap is smaller than a distance traveled by the pump head and the flexible membrane when the stepper motor and the solid pump piston cause the pump head to move towards the door. - View Dependent Claims (16, 17, 18, 20)
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19. A peritoneal dialysis method comprising:
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mechanically pushing a solid pump piston and a pump head; causing a flexible membrane to stretch via the pushing of the solid pump piston and the pump head; closing a chamber volume by stretching the flexible membrane; expelling peritoneal dialysis fluid by closing the chamber volume; mechanically pulling the solid pump piston and the pump head; causing the flexible membrane to unstretch by the pulling of the solid pump piston and the pump head; opening the chamber volume by unstretching the flexible membrane; and drawing peritoneal dialysis fluid by opening the chamber volume. - View Dependent Claims (21)
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Specification