EIGHT-CHANNEL ULTRASONIC DISPLACEMENT METER FOR MEASUREMENT OF CARDIOVASCULAR DIMENSIONS DURING CARDIAC ASSIST.

T. Nakamura, K. Hayashi, J. Seki, T. Nakatani, Y. Taenaka, M. Umezu, H. Takano, T. Akutsu

Research output: Contribution to journalConference article

Abstract

An Eight-channel ultrasonic displacement meter was developed to evaluate the effect of left ventricular assist devices (LVAD) on the performance of a natural heart. A pair of miniature ultrasonic sensors of 2 or 2. 5 mm in diameter made of piezoelectric ceramic of 6 MHz were used for each channel. Ultrasonic pulse waves are emitted from one of two sensors at the rate of 1. 95 kHz and received by the other. The transit time is proportional to the distance between two sensors. In acute experiments, LVADs were implanted in mongrel dogs between the left atrium and the descending aorta. Pairs of ultrasonic sensors were installed in the left ventricular wall to measure dimensional changes of ventricular length in the short and long axes as well as of segmental length of cardiac muscle. It has been shown that this system is very useful for studying the effect of LVADs on the performance of the natural heart.

Original languageEnglish
Pages (from-to)418-419
Number of pages2
JournalJapanese journal of medical electronics and biological engineering
Volume22
Publication statusPublished - 1984 Apr 1

ASJC Scopus subject areas

  • Biomedical Engineering

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