Automated dialysis system using piston and negative pressure
First Claim
1. A peritoneal dialysis system comprising:
- a hardware unit including a recessed area, a piston having a contact surface, a pneumatic source for supplying a negative pressure, and an actuator configured to move the contact surface of the piston into and out of at least a portion of the recessed area;
a disposable unit received by the hardware unit, the disposable unit including an outer member fitted at least partially within the recessed area of the hardware unit, and a moveable membrane positioned between the contact surface of the piston and the outer member when the disposable unit is received by the hardware unit; and
a controller configured to cause the pneumatic source to apply the negative pressure to the moveable membrane so as to conform the moveable membrane to a shape of the contact surface of the piston and follow the contact surface when the piston is moved towards and away from the outer member fitted at least partially within the recessed area.
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Accused Products
Abstract
A peritoneal dialysis system is provided that includes a hardware unit, a disposable unit received by the hardware unit, and a controller. The hardware unit includes a recessed area, a piston having a contact surface, a pneumatic source for supplying a negative pressure, and an actuator configured to move the contact surface of the piston into and out of at least a portion of the recessed area. The disposable unit includes an outer member fitted at least partially within the recessed area of the hardware unit and a moveable membrane positioned between the contact surface of the piston and the outer member when the disposable unit is received by the hardware unit. The controller is configured to cause the pneumatic source to apply the negative pressure to the moveable membrane so as to conform the moveable membrane to a shape of the contact surface of the piston and follow the contact surface when the piston is moved towards and away from the outer member fitted at least partially within the recessed area.
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Citations
20 Claims
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1. A peritoneal dialysis system comprising:
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a hardware unit including a recessed area, a piston having a contact surface, a pneumatic source for supplying a negative pressure, and an actuator configured to move the contact surface of the piston into and out of at least a portion of the recessed area; a disposable unit received by the hardware unit, the disposable unit including an outer member fitted at least partially within the recessed area of the hardware unit, and a moveable membrane positioned between the contact surface of the piston and the outer member when the disposable unit is received by the hardware unit; and a controller configured to cause the pneumatic source to apply the negative pressure to the moveable membrane so as to conform the moveable membrane to a shape of the contact surface of the piston and follow the contact surface when the piston is moved towards and away from the outer member fitted at least partially within the recessed area. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A peritoneal dialysis system comprising:
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a hardware unit including a recessed area, a piston having a contact surface, a pneumatic source for supplying a negative pressure, and an actuator configured to move the contact surface of the piston into and out of at least a portion of the recessed area; a disposable unit received by the hardware unit, the disposable unit including an outer member fitted at least partially within the recessed area of the hardware unit, and a moveable membrane positioned between the contact surface of the piston and the outer member when the disposable unit is received by the hardware unit, the moveable membrane and outer member forming a chamber for receiving dialysis fluid when the disposable unit is received by the hardware unit; and a controller configured to cause the pneumatic source to (i) apply the negative pressure to the moveable membrane so that the negative pressure conforms the moveable membrane to a shape of the contact surface of the piston, (ii) pull dialysis fluid into the chamber when the contact surface and the moveable membrane are moved away from the outer member fitted at least partially within the recessed area, and (iii) push dialysis fluid out of the chamber when the contact surface and the moveable membrane are moved towards the outer member fitted at least partially within the recessed area. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A peritoneal dialysis system comprising:
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a hardware unit including a recessed area, a piston having a contact surface, a pneumatic source for supplying a negative pressure, and an actuator configured to move the contact surface of the piston into and out of at least a portion of the recessed area; a disposable unit received by the hardware unit, the disposable unit including an outer member fitted at least partially within the recessed area of the hardware unit, and a moveable membrane positioned between the contact surface of the piston and the recessed area when the disposable unit is received by the hardware unit; and a sealed area around the piston, the sealed area allowing the negative pressure to be applied by the pneumatic source to the moveable membrane, the negative pressure causing the moveable membrane to follow the contact surface of the piston when the piston is moved towards and away from the outer member fitted at least partially within the recessed area. - View Dependent Claims (18, 19, 20)
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Specification