Automated dialysis system including a piston and stepper motor
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United States of America Patent
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Nov 29, 2011
Issued Date -
N/A
app pub date -
Oct 13, 2010
filing date -
May 24, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A peritoneal dialysis system includes a hardware unit including a piston having a contact surface and a stepper motor configured to move the piston; and a disposable unit received by the hardware unit, the disposable unit including a moveable membrane operable with the contact surface of the piston, the piston moveable towards and away from the disposable unit, wherein (i) the piston and the membrane are positioned relative to each other and (ii) the hardware unit is configured to apply a negative pressure to the moveable membrane of the disposable unit so that the negative pressure causes the moveable membrane to contact and conform to a shape of the contact surface and to follow the piston as the piston is moved away from the disposable unit by the stepper motor, and wherein the shape-contacted membrane moves with the piston as the piston is moved into the disposable unit by the stepper motor.
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Family
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