Automated dialysis system using piston and negative pressure
First Claim
1. A peritoneal dialysis system comprising:
- a hardware unit includinga recessed area,a solid pump piston including a solid piston shaft mechanically attached to a solid piston head, the solid pump piston configured to translate back-and-forth within the recessed area, the solid piston head having a contact surface defining a curved shape,a pneumatic source for supplying a negative pressure, andan actuator connected operably to the solid pump piston and configured to move the contact surface of the solid piston head into and out of the recessed area;
a disposable unit received by the hardware unit, the disposable unit includingan outer member fitted at least partially within the recessed area of the hardware unit, anda moveable membrane positioned between the contact surface of the solid piston head and the outer member when the disposable unit is received at least partially within the recessed area; and
a controller configured to cause the pneumatic source to apply the negative pressure to the moveable membrane so as to (i) conform the moveable membrane to the curved shape of the contact surface of the solid piston head and (ii) follow the curved shape of the contact surface of the solid piston head when the solid pump piston is moved towards and away from the outer member of the disposable unit when the unit is fitted at least partially within the recessed area.
1 Assignment
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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 solid pump piston including a solid piston shaft mechanically attached to a solid piston head, the solid pump piston configured to translate back-and-forth within the recessed area, the solid piston head having a contact surface defining a curved shape, a pneumatic source for supplying a negative pressure, and an actuator connected operably to the solid pump piston and configured to move the contact surface of the solid piston head into and out 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 solid piston head and the outer member when the disposable unit is received at least partially within the recessed area; and a controller configured to cause the pneumatic source to apply the negative pressure to the moveable membrane so as to (i) conform the moveable membrane to the curved shape of the contact surface of the solid piston head and (ii) follow the curved shape of the contact surface of the solid piston head when the solid pump piston is moved towards and away from the outer member of the disposable unit when the unit is 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 solid pump piston including a solid piston shaft mechanically attached to a solid piston head, the solid pump piston configured to translate back-and-forth within the recessed area, the solid piston head having a contact surface defining a curved shape, an air pump motor and a vacuum line for supplying a negative pressure, and an actuator connected to the solid pump piston and configured to move the contact surface of the solid piston head into and out 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 solid piston head and the outer member when the disposable unit is received at least partially within the recessed area, the moveable membrane and the outer member forming a chamber for receiving dialysis fluid; and a controller configured to cause the air pump motor and the vacuum line to (i) apply the negative pressure to the moveable membrane so that the negative pressure conforms the moveable membrane to the curved shape of the contact surface of the solid piston head, (ii) pull dialysis fluid into the chamber when the contact surface of the solid piston head and the moveable membrane are moved away from the outer member, and (iii) push dialysis fluid out of the chamber when the contact surface of the solid piston head and the moveable membrane are moved towards the outer member. - 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 solid pump piston including a solid piston shaft mechanically attached to a solid piston head, the solid pump piston configured to translate back-and-forth within the recessed area, the solid piston head having a contact surface defining a curved shape, an air pump motor and a vacuum line for supplying a negative pressure, a stepper motor, and an actuator connected to the stepper motor and coupled to the solid pump piston, the stepper motor and actuator configured to move the contact surface of the solid piston head into and out the recessed area; a disposable unit received by the hardware unit, the disposable unit including an outer member shaped to fit at least partially within the recessed area of the hardware unit, and a moveable membrane positioned between the contact surface of the solid piston head and the outer member when the disposable unit is received by the hardware unit; and a sealed area around the solid pump piston, the sealed area allowing the negative pressure to be applied by the air pump motor through the vacuum line to the moveable membrane, the negative pressure causing the moveable membrane to follow the contact surface of the solid piston head when the solid pump piston is moved towards and away from the outer member of the disposable unit fitted at least partially within the recessed area. - View Dependent Claims (18, 19, 20)
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Specification