System and method for testing heat exchange system for heat exchange catheter
AssigneeAlsius Corporation
InventorDavid Searl Kimball
Life of this patent
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Abstract
A heat exchange system for an indwelling catheter is tested for proper operation by observing whether a fluid temperature is within a command zone range and if not whether temperature moves toward the range or equalizes with it within predetermined parameters after a pump has stopped, and only if temperature exhibits none of the tested-for conditions indicating an error.
Claims17
A computer-implemented method for testing for proper functioning of a heat exchange system engageable with an indwelling heat exchange catheter to circulate working fluid therein using a pump, comprising:
- determining whether temperature of heat exchange fluid in a chamber through which the working fluid is circulated is within a range of a command temperature;
- if the temperature of the heat exchange fluid is not within the range, stopping the pump;
- and
- only if (1) the temperature is not within the range at the elapse of a predetermined period after the pump has stopped, or (2) the temperature has not changed during the predetermined period by at least a predetermined amount, returning an error indication.
A heat exchanger for treating working fluid to be circulated through an indwelling heat exchange catheter, comprising:
- a pump for pumping the working fluid in a fluid path;
- a heat exchange chamber in the path and containing a heat exchange fluid having a temperature;
- and
- at least one processor controlling the pump, the processor executing logic comprising:
- determining that the heat exchanger is not working properly if the temperature of the heat exchange fluid is not within an expected range only if (1) substantial equalization of heat exchange fluid temperature with working fluid temperature does not occur within a predetermined period after stopping the pump, or (2) temperature does not change by at least a predetermined amount within a predetermined period after stopping the pump.
A processor for a heat exchange system for beating and cooling a working fluid circulated through a catheter by a pump, the processor programmed to execute logic comprising:
- determining whether a fluid temperature is within a command zone range and if not, determining whether temperature moves toward the range or equalizes with it within predetermined parameters after a pump has stopped, and
- only if temperature does not move toward the range or equalize with it within predetermined parameters after the pump has stopped, indicating an error.
Dependencies are inferred from the claim text.