04665925 is referenced by 115 patents and cites 9 patents.

A steerable catheter having a Doppler crystal at the tip to measure the velocity of blood in vivo--and inferentially the blood flow. The catheter includes two passageways, one passageway being exposed to the blood stream with the other passageway containing the electrical leads to the Doppler crystal. The one passageway is dimensioned for receiving a wire guide for accurately manipulating the catheter. Preferably, the catheter incorporates an inflatable angio-balloon operable to distend the blood vessel in the region of a stenosis. Thus, blood flow can be determined in the region of the stenosis before and/or after the vessel is distended. The passageways are preferably defined by a pair of generally concentric tubes with the Doppler crystal doughnut-shaped and sealingly disposed at the tip of the catheter.

Title
Doppler catheter
Application Number
6/775857
Publication Number
4665925
Application Date
September 13, 1985
Publication Date
May 19, 1987
Inventor
Huntly D Millar
Houston
TX, US
Agent
Arnold White & Durkee
Assignee
Pfizer Hospital Products Group
NY, US
IPC
A61B 10/00
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