PORTABLE APPARATUS FOR PERITONEAL DIALYSIS THERAPY
First Claim
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1. A peritoneal dialysis system, comprising:
- a removable cassette defining first and second flexible pump chambers and first and second pressure sensing areas that are fluidly connected to the first and second pump chambers, respectively; and
a peritoneal dialysis machine, comprisinga holding mechanism configured to secure the cassette within a cassette compartment of the peritoneal dialysis machine;
first and second stepper motors connected to first and second piston heads, respectively, the first and second stepper motors being configured in a manner such that the first and second piston heads can be moved relative to the cassette to force peritoneal dialysis fluid out of and draw peritoneal dialysis fluid into the first and second pump chambers, respectively, during operation of the peritoneal dialysis system;
first and second pressure sensors positioned to align with and to contact the first and second pressure sensing areas, respectively, of the cassette when the cassette is secured within the cassette compartment and the holding mechanism is activated; and
a control unit connected to the first and second pressure sensors and adapted to change the operation of the peritoneal dialysis machine in response to changes in pressure sensed by the pressure sensors,wherein the first and second pressure sensors and the first and second pressure sensing areas are arranged so that the first pressure sensor measures a pressure of fluid in a first fluid passage between the first pump chamber and a patient during operation of the peritoneal dialysis system, and the second pressure sensor measures a pressure of fluid in a fluid passage between the second pump chamber and the patient during operation of the peritoneal dialysis system.
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Abstract
A portable peritoneal dialysis apparatus having (1) a hinged door for enclosing a disposable cassette that seals tightly shut using air pressure; (2) accurate pressure sensing of pressures applied to the patient through an enclosure in the disposable cassette; (3) two pumps that can operate separately or in tandem actuated by two separate stepper motors; and (4) a touch screen user interface where indicia of the operating mode is always visible along with indicia for the other possible operating modes and the mode can be changed by touching one of these indicia.
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Citations
19 Claims
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1. A peritoneal dialysis system, comprising:
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a removable cassette defining first and second flexible pump chambers and first and second pressure sensing areas that are fluidly connected to the first and second pump chambers, respectively; and a peritoneal dialysis machine, comprising a holding mechanism configured to secure the cassette within a cassette compartment of the peritoneal dialysis machine; first and second stepper motors connected to first and second piston heads, respectively, the first and second stepper motors being configured in a manner such that the first and second piston heads can be moved relative to the cassette to force peritoneal dialysis fluid out of and draw peritoneal dialysis fluid into the first and second pump chambers, respectively, during operation of the peritoneal dialysis system; first and second pressure sensors positioned to align with and to contact the first and second pressure sensing areas, respectively, of the cassette when the cassette is secured within the cassette compartment and the holding mechanism is activated; and a control unit connected to the first and second pressure sensors and adapted to change the operation of the peritoneal dialysis machine in response to changes in pressure sensed by the pressure sensors, wherein the first and second pressure sensors and the first and second pressure sensing areas are arranged so that the first pressure sensor measures a pressure of fluid in a first fluid passage between the first pump chamber and a patient during operation of the peritoneal dialysis system, and the second pressure sensor measures a pressure of fluid in a fluid passage between the second pump chamber and the patient during operation of the peritoneal dialysis system.
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2. A peritoneal dialysis system, comprising:
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a removable cassette defining a flexible pump chamber and a pressure sensing area that is fluidly connected to the pump chamber, wherein, during operation of the peritoneal dialysis system, peritoneal dialysis fluid is contained in the pump chamber; and a peritoneal dialysis machine, comprising a holding mechanism configured to secure the cassette within a cassette compartment of the peritoneal dialysis machine; a pressure sensor positioned to align with and to contact the pressure sensing area of the cassette when the cassette is secured within the cassette compartment and the holding mechanism is activated; and a control unit connected to the pressure sensor and adapted to change the operation of the peritoneal dialysis machine in response to changes in pressure sensed by the pressure sensor, wherein the pressure sensor and the pressure sensing area are arranged so that the pressure sensor measures a pressure of fluid in a fluid passage between the pump chamber and a patient during operation of the peritoneal dialysis system. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A peritoneal dialysis cassette, comprising:
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a flexible pump chamber adapted to contain a fluid; ingress and egress passageways fluidly connected to the pump chamber to conduct fluid into and out of the pump chamber to and from the patient; and a pressure sensing area fluidly connected to the pump chamber, wherein an outer surface of the pressure sensing area of the cassette is positioned to align with and to contact a pressure sensor of a peritoneal dialysis machine when the cassette is positioned within a cassette compartment of the peritoneal dialysis machine so as to enable the pressure sensor to measure the pressure of fluid in one of the ingress and egress passageways between the pump chamber and a patient during peritoneal dialysis. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification