Peritoneal dialysis systems employing a liquid distribution and pumping cassette that emulates gravity flow
First Claim
1. A system for performing peritoneal dialysis comprisinga pumping mechanism comprising a diaphragm,means for establishing flow communication with the patient'"'"'s peritoneal cavity through the pumping mechanism, andactuating means for emulating a selected gravity flow condition by applying fluid pressure to the diaphragm to operate the pumping mechanism to either move dialysis solution from the peritoneal cavity or move dialysis solution into the peritoneal cavity, andcontrol means selectively operating the actuating means for applying fluid pressure to emulate either a fixed head height condition or different head height conditions.
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Accused Products
Abstract
Peritoneal dialysis systems apply fluid pressure to move liquid. The systems can emulate either a fixed head height condition or different head height conditions, independent of the actual head height differential between the patient'"'"'s peritoneal cavity and the external liquid source or destination. The systems can also switch between low-relative pressure flow mode when considerations of patient comfort and safety predominate and a high-relative pressure flow mode when considerations of processing speed predominate.
714 Citations
35 Claims
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1. A system for performing peritoneal dialysis comprising
a pumping mechanism comprising a diaphragm, means for establishing flow communication with the patient'"'"'s peritoneal cavity through the pumping mechanism, and actuating means for emulating a selected gravity flow condition by applying fluid pressure to the diaphragm to operate the pumping mechanism to either move dialysis solution from the peritoneal cavity or move dialysis solution into the peritoneal cavity, and control means selectively operating the actuating means for applying fluid pressure to emulate either a fixed head height condition or different head height conditions.
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9. A peritoneal dialysis system comprising
a pumping mechanism comprising a pump chamber, at least one valve communicating with the pump chamber, and a diaphragm, means for establishing flow communication between the pumping mechanism and the patient'"'"'s peritoneal cavity, actuating means for emulating gravity flow conditions by applying fluid pressure to the diaphragm to operate the pump chamber and valve to: -
(i) drain spent peritoneal dialysis solution from the patient'"'"'s peritoneal cavity, and (ii) infuse fresh dialysis solution from a source into the patient'"'"'s peritoneal cavity, and control means selectively operating the actuating means for applying fluid pressure to emulate either a fixed head height condition or different head height conditions. - View Dependent Claims (10, 11, 12, 13)
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14. A peritoneal dialysis system comprising
means defining a pump chamber that has a diaphragm, patient conduit means for establishing flow communication between the pump chamber and patient'"'"'s peritoneal cavity, an other conduit means for establishing flow communication between the pump chamber and an external component outside the patient'"'"'s peritoneal cavity, means for applying fluid pressure to the diaphragm to pump dialysis solution through patient conduit means and the other conduit means, and pressure regulation means for applying fluid pressure variations to the diaphragm of a first magnitude when liquid is conveyed through the patient conduit means and for applying fluid pressure to the diaphragm of a second magnitude different than the first magnitude when liquid is conveyed through the other conduit means.
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20. A peritoneal dialysis system comprising
means defining a pump chamber that has a diaphragm, conduit means for establishing flow communication among the patient'"'"'s peritoneal cavity, a source of fresh dialysis solution, and a drain through the pump chamber, actuating means for applying fluid pressure to the diaphragm to move spent peritoneal dialysis solution from the patient'"'"'s peritoneal cavity to the drain through the pump chamber and to pump fresh dialysis solution from the source to the patient'"'"'s peritoneal cavity through the pump chamber, means for directing fluid flow through the pump chamber including means for directing spent peritoneal dialysis solution from the patient'"'"'s peritoneal cavity into the pump chamber, means for directing the spent dialysis solution from the pump chamber to the drain, means for directing fresh dialysis solution from the source into the pump chamber, and means for directing the fresh dialysis solution from the pump chamber to the patient'"'"'s peritoneal cavity, and pressure regulation means for applying fluid pressure to the diaphragm of a first magnitude when liquid is conveyed through the pump chamber to and from the patient'"'"'s peritoneal cavity and for applying fluid pressure variations to the diaphragm of a second magnitude different than the first magnitude when liquid is conveyed through the pump chamber either to the drain or from the source container.
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25. A peritoneal dialysis system comprising
means defining a pump chamber that has a diaphragm, conduit means for establishing flow communication among the patient'"'"'s peritoneal cavity, a source of fresh dialysis solution, a reservoir for heating the fresh dialysis solution, and a drain through the pump chamber, actuating means for applying fluid pressure to the diaphragm to move liquid through the pump chamber, means for directing liquid flow through the pump chamber including means for directing spent peritoneal dialysis solution from the patient'"'"'s peritoneal cavity into the pump chamber, means for directing the spent dialysis solution from the pump chamber to the drain, means for directing fresh dialysis solution from the source into the pump chamber, means for directing the fresh dialysis solution from the pump chamber to the reservoir for heating, means for directing the heated fresh dialysis solution from the reservoir into the pump chamber, and means for directing the heated fresh dialysis solution from the pump chamber to the patient'"'"'s peritoneal cavity, and pressure regulation means for applying fluid pressure to the diaphragm of a first magnitude when liquid is conveyed through the pump chamber to and from the patient'"'"'s peritoneal cavity and for applying fluid pressure to the diaphragm of a second magnitude different than the first magnitude when liquid is conveyed through the pump chamber either to the drain; - or from the source container;
or to and from the reservoir. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33)
- or from the source container;
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34. A system for performing peritoneal dialysis comprising
a pumping mechanism comprising a diaphragm, means for establishing flow communication with the patient'"'"'s peritoneal cavity through the pumping mechanism, and actuating means for emulating a selected gravity flow condition by applying pneumatic fluid pressure to the diaphragm to operate the pumping mechanism to either move dialysis solution from the peritoneal cavity or move dialysis fluid into the peritoneal cavity, the actuating means including a chamber for receiving pneumatic pressure and insert means occupying the chamber for stabilizing the applied pneumatic pressure within the chamber.
Specification