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An Implantable Transit-Time Aortic Flow Probe Using Capacitive Micromachined Ultrasound Transducers: Design and Optimization

[+] Author Affiliations
Jessica Liu

University of Colorado at Boulder, Boulder, CO

Robin Shandas

University of Colorado at Boulder, Boulder, COThe Children’s Hospital, Denver, CO

Paper No. SBC2007-176579, pp. 745-746; 2 pages
doi:10.1115/SBC2007-176579
From:
  • ASME 2007 Summer Bioengineering Conference
  • ASME 2007 Summer Bioengineering Conference
  • Keystone, Colorado, USA, June 20–24, 2007
  • Conference Sponsors: Bioengineering Division
  • ISBN: 0-7918-4798-5
  • Copyright © 2007 by ASME

abstract

Monitoring cardiac output continuously post-surgery for children with congenital heart disease is an important part of post-operative recovery, especially given the potential for large changes in vascular pressure as a side-effect of pharmaceutical agents given to help recovery. Current methods to monitor cardiac output are limited by the requirement for invasiveness (cuff-type flow probes), or do not provide continuous monitoring (ultrasound Doppler). Using a combination of analytical and finite element modeling, we explore the design and optimization of a unique ultrasonic transit-time flow probe that extends the capability of current devices by providing greater miniaturization, better sensitivity, and lower cost through the use of capacitive micromachined ultrasound transducer (cMUT) technology.

Copyright © 2007 by ASME

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