Method and System for Achieving Volumetric Accuracy in Hemodialysis Systems
First Claim
1. A system for maintaining volumetric balance of the fluid infused into a patient and the fluid removed from said patient during renal dialysis, the system comprising:
- a first fluid circuit for infusing fluid into the patient;
a second fluid circuit for removing fluid from the patient;
a first pump configured to alternately operate on said first circuit and said second circuit;
a second pump configured to alternately operate on said second circuit and said first circuit; and
a controller for causing said first pump to alternatively operate on said first circuit and said second circuit and for causing said second pump to alternatively operate on said first circuit and said second circuit, wherein each of the said first pump and second pump operate only one circuit at a given time.
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0 Petitions
Accused Products
Abstract
Volumetric accuracy in hemodialysis systems is provided by swapping pumps between the replacement fluid side and the output side for a hemofiltration system and between the return fluid side and the sorbent side for a closed-loop, sorbent-based system, such that same quantity of fluid is pumped at each point after the end of an even number of pump swaps. A method for calculating the time interval between swaps is provided based on an allowable difference in amount pumped in the two functions at any given time. A mechanism is provided for compensating for the differences in head pressure presented to the pumps for fluid coming from the replacement-fluid containers or the reservoir and that coming back from the patient through the dialyzer. The pump-swapping system provides an accurate means that can be inexpensively implemented, including using a disposable device.
226 Citations
20 Claims
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1. A system for maintaining volumetric balance of the fluid infused into a patient and the fluid removed from said patient during renal dialysis, the system comprising:
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a first fluid circuit for infusing fluid into the patient; a second fluid circuit for removing fluid from the patient; a first pump configured to alternately operate on said first circuit and said second circuit; a second pump configured to alternately operate on said second circuit and said first circuit; and a controller for causing said first pump to alternatively operate on said first circuit and said second circuit and for causing said second pump to alternatively operate on said first circuit and said second circuit, wherein each of the said first pump and second pump operate only one circuit at a given time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for maintaining volumetric balance of the fluid infused into a patient and the fluid removed from said patient during renal dialysis, the method comprising:
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using a first fluid circuit for infusing fluid into the patient; using a second fluid circuit for removing fluid from the patient; providing a first pump having an ability to alternately operate on said first circuit and said second circuit; providing a second pump having an ability to alternately operate on said second circuit and said first circuit; causing said first pump to alternatively operate on said first circuit and said second circuit; and causing said second pump to alternatively operate on said first circuit and said second circuit, wherein each of the said first pump and second pump operate only one circuit at a given time. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method for maintaining volumetric balance of the fluid infused into a patient and the fluid removed from said patient during renal dialysis, the method comprising:
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using a first fluid circuit for infusing fluid into the patient; using a second fluid circuit for removing fluid from the patient; providing a first pump having an ability to alternately operate on said first circuit and said second circuit; providing a second pump having an ability to alternately operate on said second circuit and said first circuit; causing said first pump to alternatively operate on said first circuit and said second circuit; causing said second pump to alternatively operate on said first circuit and said second circuit, wherein each of the said first pump and second pump operate only one circuit at a given time; and equalizing a pressure differential between said first and second circuits, wherein said pressure differential is determined based upon a measured pressure differential derived from a first pressure sensor in said first circuit and from a second pressure sensor in said second first circuit. - View Dependent Claims (17, 18, 19, 20)
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Specification