Automated dialysis system including a piston and stepper motor
DCFirst Claim
1. A peritoneal dialysis system comprising:
- a hardware unit including a piston having a contact surface, a pneumatic source for supplying a negative pressure, 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 pneumatic source of the hardware unit is configured to apply the 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, andwherein 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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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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Citations
22 Claims
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1. A peritoneal dialysis system comprising:
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a hardware unit including a piston having a contact surface, a pneumatic source for supplying a negative pressure, 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 pneumatic source of the hardware unit is configured to apply the 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A peritoneal dialysis system comprising:
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a hardware unit including a piston having a contact surface, a pneumatic source for supplying a negative pressure, 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, the piston and the membrane positioned relative to each other and the pneumatic source of the hardware unit configured to apply the negative pressure to the moveable membrane of the disposable unit, wherein (i) the negative pressure causes the moveable membrane to contact and conform to a shape of the contact surface, (ii) the contact surface and shape-conformed membrane follows the piston as the piston is moved away from the disposable unit by the stepper motor, and (iii) the shape-conformed membrane moves with the piston as the piston is moved into the disposable unit by the stepper motor. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A peritoneal dialysis system comprising:
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a hardware unit including a piston having a contact surface, a pneumatic source for supplying a negative pressure, and a stepper motor configured to move the piston; 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; and a sealing apparatus positioned so as to form a sealed area around the piston and the moveable membrane of the disposable unit, the sealed area allowing the pneumatic source of the hardware unit to apply the negative pressure to the moveable membrane of the disposable unit, the negative pressure causing the moveable membrane to follow the piston as the piston is moved away from the disposable unit by the stepper motor. - View Dependent Claims (19, 20, 21, 22)
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Specification