| 摘要 |
<p>A vascular flow measurement catheter device for measuring total volumetric flow through a vessel includes a flow measurement catheter (12) having a full flow lumen of known cross-sectional geometry provided with a relatively short distal measurement segment with inlet and outlet ports (20, 24) positioned to carry the full flow of the vessel in the manner of a segment of the vessel itself when the outer catheter (12) is positioned in the vessel of interest. An ultrasonic transducer system (32) is mounted in the flow measurement catheter for communicating the velocity of the fluid in the measurement segment of the full flow lumen and for determining the total volumetric flow. An obturator catheter (16) is provided in coaxial relation to the lumen of the flow measurement catheter and adapted to travel along and within or without the full flow lumen of the measurement catheter to function to shut off the flow through the measurement catheter when advanced over inlet or outlet ports of the measurement catheter.</p> |
