DEVELOPMENT OF SPECIAL PURPOSE CATHETER TIP TRANSDUCERS.
Final rept. 15 Sep 66-15 May 67,
SOUTHWEST RESEARCH INST SAN ANTONIO TEX
Pagination or Media Count:
The report summarizes the work done toward the development of ultrasonic Doppler blood flow velocity measurement catheters and multipurpose catheters which included ultrasonic transducers developed during the program. A prototype split-disc type ultrasonic transducer developed previously was used as a basis of design. Five operating ultrasonic catheters, which were thoroughly tested in vitro were delivered for in vivo tests in experimental animals. Three of these transducers were of split-disc construction and two were the solid-disc type with electrically isolated active electrodes. All catheters were operable but their performance characteristics differed. Intravascular blood flow velocity information was acquired at various points within the great vessels with four of the five catheters. One catheter contained a lumen for blood sampling and a stiffener for pre-positioning the tip. Another contained a pressure transducer with which simultaneous blood pressure and blood flow velocity data were acquired. Operating characteristics and as-built drawings were supplied for all catheters. A brief review of the state-of-the-art of catheter tip ultrasonic flowmeters is presented and suggestions for approaches to further development are made. Author
- Medical Facilities, Equipment and Supplies