Method and apparatus for controlling a medical fluid heater
First Claim
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1. A method of controlling a medical fluid heater comprising the steps of:
- determining a first heater control output based on a number of measured inputs for the heater and at least one mathematical relationship between at least two of the measured inputs;
determining a second heater control output based on at least one fuzzy logic membership function and at least one fuzzy logic rule; and
determining a third heater control output based on the first and second outputs and using the third heater control output to control the heater.
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Abstract
A method, system and apparatus for performing peritoneal dialysis are provided. To this end, in part, a method of controlling a medical fluid heater is provided. The method includes the steps of determining a first heater control output based on a number of measured inputs for the heater and at least one mathematical relationship between at least two of the measured inputs, determining a second heater control output based on at least one fuzzy logic membership function and at least one fuzzy logic rule, and determining a third heater control output based on the first and second outputs and using the third heater control output to control the heater.
247 Citations
21 Claims
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1. A method of controlling a medical fluid heater comprising the steps of:
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determining a first heater control output based on a number of measured inputs for the heater and at least one mathematical relationship between at least two of the measured inputs;
determining a second heater control output based on at least one fuzzy logic membership function and at least one fuzzy logic rule; and
determining a third heater control output based on the first and second outputs and using the third heater control output to control the heater. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of controlling a medical fluid heater comprising the steps of:
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determining a first heater control output using a first mathematical relationship between a number of heater inputs and updating the first output at a first frequency;
determining a second heater control output using a second mathematical relationship between a number of heater inputs and updating the second output at a second frequency, wherein the second mathematical relationship includes a measured fluid temperature feedback at the second frequency; and
determining a third heater control output based on the first and second outputs and using the third heater control output to control the heater. - View Dependent Claims (16, 17, 18)
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19. A method of controlling a medical fluid heater comprising the steps of:
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determining a first heater control output using a first mathematical relationship between a number of heater inputs;
determining a second heater control output using a second mathematical relationship between a number of heater inputs;
weighting the relative importance of the first and second outputs and determining a third heater control output based on the first output, second output and the weighting; and
controlling the heater using the third heater control output.
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20. A method of controlling a medical fluid heater comprising the steps of:
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determining a first heater duty cycle based on at least one input signal selected from the group consisting of;
a measured number of pump stroke intervals, a heater input voltage and a measured fluid temperature;
determining a second heater duty cycle by;
(i) determining a plurality of fuzzy logic membership functions;
(ii) converting a difference between a desired temperature and a measure temperature into fuzzy sets based on the membership functions;
(iii) applying a plurality of fuzzy logic rules; and
(iv) converting an output of the rules to the second duty cycle; and
determining a third heater duty cycle based on the first and second heater duty cycles and using the third heater duty cycle to control the heater.
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21. An automated dialysis system comprising:
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a pump operable to pump medical fluid;
a heater operable to heat the medical fluid; and
a controller that operates with the medical fluid heater to;
determine a first heater control output based on a number of measured inputs for the heater and at least one mathematical relationship between at least two of the inputs;
determine a second heater control output based on at least one fuzzy logic membership function and at least one fuzzy logic rule; and
determine a third heater control output based on the first and second outputs and use the third heater control output to control the heater.
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Specification