Back to results
US 8,133,185 B2Granted
Catheter with common guide wire and indicator lumen
AssigneeTransonic Systems, Inc.
InventorsNikolai M. Krivitski, Victor V. Kislukhin
Life of this patent
Estimating the term…
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.
Claims12
A method of measuring a blood flow rate, the method comprising:
- (a) passing a guide wire through an indicator lumen in an elongate catheter body having a longitudinal axis to pass a portion of the guide wire through a terminal port of the indicator lumen;
- (b) passing an indicator through the indicator lumen to pass from the elongate catheter body through the terminal port and an injection port located along the longitudinal axis intermediate the terminal port and a proximal end of the catheter body, wherein a total volume of the indicator passed through the catheter body equals the combined volume of indicator passing through the terminal port and the injection port;
- (c) calculating the blood flow rate as a function of a volume less than a total volume of the indicator passed through the indicator lumen.
A method of measuring a blood flow rate, comprising:
- (a) passing a guide wire through an indicator lumen in an elongate catheter body having a longitudinal axis to pass a portion of the guide wire through a terminal port of the indicator lumen;
- (b) passing an indicator through the indicator lumen to pass from the elongate catheter body through the terminal port and an injection port intermediate the terminal port and a proximal end of the catheter body;
- (c) sensing the indicator with a sensor, the sensor longitudinally located along the longitudinal axis intermediate the longitudinal position of the terminal port and the injection port along the longitudinal axis;
- and
- (d) calculating the blood flow rate based on passage of the indicator through the terminal port and the sensed indicator.
2 more elements
A method of measuring a blood flow rate, the method comprising:
- (a) passing a guide wire through an indicator lumen in an elongate catheter body having a longitudinal axis to pass a portion of the guide wire through a terminal port of the indicator lumen;
- (b) passing an indicator through the indicator lumen to pass from the elongate catheter body through the terminal port and an injection port located along the longitudinal axis intermediate the terminal port and a proximal end of the catheter body, wherein a total volume of the indicator passed through the catheter body equals the combined volume of indicator passing through the terminal port and the injection port;
- (c) sensing with a sensor passage of the indicator in the blood flow along a length of the catheter;
- and
- (d) calculating the blood flow rate as a function of a volume less than a total volume of the indicator passed through the indicator lumen and the sensed indicator.
2 more elements
Dependencies are inferred from the claim text.