Method of controlling dialysis using blood circulation times
First Claim
1. A method of controlling dialysis, comprising:
- injecting a bolus into a blood stream during dialysis;
storing a time of injection of said bolus;
measuring a time of receipt of a return flow resulting from said injected bolus;
repeating said injecting, storing and measuring steps a plurality of times; and
determining a patient'"'"'s condition from said plurality of stored times of injection and measured times.
2 Assignments
0 Petitions
Accused Products
Abstract
The instant method involves intermittently infusing saline boluses into a patient'"'"'s bloodstream during dialysis, and monitoring how long it takes for the bolus to complete a full circuit through the body. The concentrations versus time of one of more return flows as a result of the injected bolus are measured including a peak resulting from a fast circuit path, a peak resulting from a slow circuit path, and an average of the two aforementioned peaks. These parameters can be monitored over time in response to the injection of a plurality of boluses and their values over time used to determine the condition of the patient. Because of the rules governing abstracts, this abstract should not be used to construe the claims.
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Citations
26 Claims
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1. A method of controlling dialysis, comprising:
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injecting a bolus into a blood stream during dialysis; storing a time of injection of said bolus; measuring a time of receipt of a return flow resulting from said injected bolus; repeating said injecting, storing and measuring steps a plurality of times; and determining a patient'"'"'s condition from said plurality of stored times of injection and measured times. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of controlling dialysis, comprising:
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injecting a bolus into a blood stream during dialysis; measuring a first time of receipt of a particular concentration of a first return flow resulting from said injected bolus; measuring a second time of receipt of said particular concentration of a second return flow resulting from said injected bolus; determining a time difference between said first and second times; repeating said injecting, measuring a first time, measuring a second time, and determining a time difference a plurality of times; and determining a patient'"'"'s condition from said plurality of time differences. - View Dependent Claims (13, 14, 15)
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16. A dialysis machine, comprising:
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a first pump and a first plurality of valves for moving blood through a blood circuit; a second pump for moving dialysate through a dialysate circuit; and a control system comprising an input device for receiving information;
a non-volatile memory device responsive to said input device for storing patient specific information; and
a processor responsive to said memory device, said memory device carrying instructions which, when executed, cause the control system to execute a method comprising;injecting a bolus into a blood stream during dialysis; storing a time of injection of said bolus; measuring a time of receipt of a particular concentration of a return flow resulting from said injected bolus; repeating said injecting, storing and measuring steps a plurality of times; and determining a patient'"'"'s condition from said plurality of stored times of injection and measured times. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A computed readable storage medium carrying a set of instructions which, when executed, perform a method comprising:
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injecting a bolus into a blood stream during dialysis; storing a time of injection of said bolus; measuring a time of receipt of a return flow resulting from said injected bolus; repeating said injecting, storing and measuring steps a plurality of times; and determining a patient'"'"'s condition from said plurality of stored times of injection and measured times.
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Specification