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

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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
Title of host publicationJapanese Journal of Medical Electronics and Biological Engineering
PublisherJapan Soc of Medical Electronics & Biological Engineering
Pages418-419
Number of pages2
Volume22
Publication statusPublished - 1984 Apr
Externally publishedYes

    Fingerprint

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

Nakamura, T., Hayashi, K., Seki, J., Nakatani, T., Taenaka, Y., Umezu, M., Takano, H., & Akutsu, T. (1984). EIGHT-CHANNEL ULTRASONIC DISPLACEMENT METER FOR MEASUREMENT OF CARDIOVASCULAR DIMENSIONS DURING CARDIAC ASSIST. In Japanese Journal of Medical Electronics and Biological Engineering (Vol. 22, pp. 418-419). Japan Soc of Medical Electronics & Biological Engineering.