Compensation method for thermodilution catheter having an injectate induced thermal effect in a blood flow measurement
AssigneeTransonic Systems, Inc.
InventorsNikolai M. Krivitski, Victor V. Kislukhin
Life of this patent
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Abstract
A catheter for retrograde orientation in a blood flow is used to determine the blood flow rate by thermodilution measurements. The determination of the blood flow rate accommodates injectate induced thermal influences on a dilution thermal sensor, wherein the thermal influences can occur prior to introduction of the injectate into the blood flow.
Claims20
A method of determining blood flow in a conduit, comprising compensating for an injectate induced thermal offset of a thermal dilution sensor connected to a catheter, the compensating including one of (i) pre-calibrating a thermal property of the catheter or the thermal dilution sensor;
- (ii) determining a calibration coefficient for the catheter and (iii) determining a thermal transfer coefficient for the catheter.
A method of determining blood flow in a conduit, comprising compensating for an injectate induced thermal offset of a thermal dilution sensor connected to a catheter by pre-calibrating a thermal property of the catheter.
A method of determining a blood flow in a conduit, the method comprising:
- (a) passing an injectate through a lumen in a catheter, the passing injectate inducing a measurement offset in a blood parameter sensor;
- and
- (b) compensating for the measurement offset of the blood parameter sensor by one of (i) pre-calibrating a thermal property of the catheter or the blood parameter sensor;
- (ii) determining a calibration coefficient for the catheter and (iii) determining a thermal transfer coefficient for the catheter.
A method of determining a blood flow in a conduit, the method comprising:
- (a) passing an injectate through a lumen in a catheter, the passing injectate inducing a measurement offset in a blood parameter sensor;
- and
- (b) compensating for the measurement offset of the blood parameter sensor by pre-calibrating the blood parameter sensor.
A method of determining a blood flow in a conduit, the method comprising:
- (a) passing an injectate through a lumen in a catheter, the passing injectate inducing a measurement offset in a blood parameter sensor;
- and
- (b) compensating for the measurement offset of the blood parameter sensor by adjusting a measured parameter by a calibration coefficient.
A method of thermodilution measurement of blood flow rate by a catheter, the method comprising:
- (a) identifying a thermal transfer coefficient for the catheter;
- and
- (b) adjusting a thermal dilution sensor measurement by an amount corresponding to the thermal transfer coefficient.
Dependencies are inferred from the claim text.