Liquid pumping mechanisms for peritoneal dialysis systems employing fluid pressure
DC CAFCFirst Claim
1. A system for performing peritoneal dialysis comprisinga liquid distribution cassette includinga pumping mechanism comprising a pump chamber, a diaphragm associated with the pump chamber and at least one valve communicating with the pump chamber, andmeans for establishing flow communication between the pumping mechanism and the patient'"'"'s peritoneal cavity,an actuator for the cassette includinga support for the cassette body,a housing enclosing the support,a source element carried within the housing to generate positive and negative fluid pressure, anda pressure conveying element carried within the housing and communicating with the source element for applying positive and negative fluid pressure to the diaphragm to operate the pump chamber and valve to move dialysis liquid either to or from the patient'"'"'s peritoneal cavity.
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Accused Products
Abstract
Pumping mechanisms for performing peritoneal dialysis and the like employ a pumping mechanism comprising a diaphragm that operate in response to applied fluid pressure. Flexible tubing is attached to the pumping mechanism for carrying liquid to and from the patient'"'"'s peritoneal cavity. An actuating station for pumping mechanism receives the pumping mechanism and attached tubing. A pressure transfer element conveys fluid pressure to the diaphragm for moving liquid through the cassette. An occluder element contacts and crimps closed the tubing attached to the cassette. A first reservoir inflates with positive fluid pressure for contacting the pressure transfer element to hold it in operative contact against the diaphragm. A second reservoir inflates with positive fluid pressure for contacting the occluding element to hold it away from crimping contact with the tubing. At least one of the first and second reservoirs also transports fluid pressure to the pressure transfer element for conveyance to the diaphragm.
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Citations
46 Claims
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1. A system for performing peritoneal dialysis comprising
a liquid distribution cassette including a pumping mechanism comprising a pump chamber, a diaphragm associated with the pump chamber and at least one valve communicating with the pump chamber, and means for establishing flow communication between the pumping mechanism and the patient'"'"'s peritoneal cavity, an actuator for the cassette including a support for the cassette body, a housing enclosing the support, a source element carried within the housing to generate positive and negative fluid pressure, and a pressure conveying element carried within the housing and communicating with the source element for applying positive and negative fluid pressure to the diaphragm to operate the pump chamber and valve to move dialysis liquid either to or from the patient'"'"'s peritoneal cavity.
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28. A system for performing peritoneal dialysis comprising
a liquid distribution cassette including a pumping mechanism comprising a pump chamber, a diaphragm associated with the pump chamber and at least one valve communicating with the pump chamber, means for establishing flow communication between the pumping mechanism and a patient'"'"'s peritoneal cavity, an actuator for the cassette including a support for the cassette body, a housing enclosing the support, and a pressure conveying element carried within the housing for conveying fluid pressure to the diaphragm to operate the pump chamber and valve to move dialysis liquid either to or from the patient'"'"'s peritoneal cavity, the pressure conveying element including a pressure transfer element in contact against the diaphragm of the pump chamber to convey fluid pressure to the diaphragm to move liquid through the pump chamber, a reservoir that inflates in response to the introduction of positive fluid pressure for contacting the pressure transfer element to hold it in contact against the diaphragm, conduit means for transporting positive fluid pressure from a source to the reservoir element, and pressure regulator means communicating with the reservoir element and the pressure transfer element for maintaining positive fluid pressure in the reservoir element above a predetermined amount to maintain contact between the pressure transfer element and the diaphragm while transporting positive fluid pressure from the reservoir element to the pressure transfer element for conveyance to the diaphragm.
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34. A system for performing peritoneal dialysis comprising
a liquid distribution cassette including a pumping mechanism comprising a pump chamber, a diaphragm associated with the pump chamber and at least one valve communicating with the pump chamber, and means for establishing flow communication between the pumping mechanism and a patient'"'"'s peritoneal cavity including flexible tubing attached to the cassette, an actuator for the cassette including a support for the cassette body, a housing enclosing the support, and a pressure conveying element carried within the housing for conveying fluid pressure to the diaphragm to operate the pump chamber and valve to move dialysis liquid either to or from the patient'"'"'s peritoneal cavity, an occluding element movable when the cassette and tubing are received in the support between a normally biased flow disabled position contacting and crimping closed the tubing and a flow enabled position out of contact with the tubing, an occluder bladder that inflates in response to the introduction of a predetermined amount of positive fluid pressure for contacting the occluding element and holding the occluding element in its flow enabled position as long as the predetermined positive pressure is maintained in the occluder bladder, and occlusion control means operative in a first control condition for conveying positive fluid pressure from a source to the occluder bladder to maintain the predetermined positive pressure, the occlusion control means being further operative in a second control condition for venting the positive pressure in the occluder bladder to cause the occluder element to move into its normally biased flow disable position.
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38. A system for performing peritoneal dialysis comprising
a liquid distribution cassette including a pumping mechanism comprising a pump chamber, a diaphragm associated with the pump chamber and at least one valve communicating with the pump chamber, means for establishing flow communication between the pumping mechanism and a patient'"'"'s peritoneal cavity, an actuator for the cassette including a support for the cassette body, a housing enclosing the support, and a pressure conveying element carried within the housing for conveying fluid pressure including a pressure transfer element movable into contact with the diaphragm to operate the pump chamber and valve to move dialysis liquid either to or from the patient'"'"'s peritoneal cavity, and a reservoir that inflates in response to the introduction of fluid pressure to contact the pressure transfer element and hold it in contact against the diaphragm.
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41. A system for performing peritoneal dialysis comprising
a liquid distribution cassette including a pumping mechanism comprising a pump chamber, a diaphragm associated with the pump chamber and at least one valve communicating with the pump chamber, means for establishing flow communication between the pumping mechanism and a patient'"'"'s peritoneal cavity, an actuator for the cassette including a support for the cassette body, a housing enclosing the support, and a pressure conveying element carried within the housing for conveying fluid pressure including a pressure transfer element and a carrier that moves the pressure transfer element between an at rest position away from the diaphragm and an operating position in contact against the diaphragm to operate the pump chamber and valve to move dialysis liquid either to or from the patient'"'"'s peritoneal cavity, and a reservoir that inflates in response to the introduction of positive pressure to move the carrier from the at rest position to the operating position.
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44. A system for performing peritoneal dialysis comprising
a liquid distribution cassette including a pumping mechanism comprising a pump chamber, a diaphragm associated with the pump chamber and at least one valve communicating with the pump chamber, means for establishing flow communication between the pumping mechanism and a patient'"'"'s peritoneal cavity including flexible tubing attached to the cassette, an actuator for the cassette including a support for the cassette body, a housing enclosing the support, and a pressure conveying element carried within the housing for conveying fluid pressure including a pressure transfer element contacting the diaphragm to operate the pump chamber and valve to move dialysis liquid either to or from the patient'"'"'s peritoneal cavity, and an occluding element operative when the cassette and flexible tubing are received in the support for movement between a flow disabled position contacting and crimping closed the flexible tubing and a flow enabled position out of contact with the flexible tubing, including an occluder bladder that inflates in response to the introduction of a predetermined amount of positive fluid pressure for contacting the occluding element and holding the occluding element in its flow enabled position as long as the predetermined positive pressure is maintained in the occluder bladder.
Specification