Recording of the Apexcardiogram with a Pick-up Device Utilizing the Commercial Crystal Ear-phone Keimei Mashimo 1 , Yoshinori Tanabe 1 , Shinji Kinoshita 1 , Sanya Sakamoto 1 , Masaomi Onishi 1 , Nobuko Tsushima 1 12nd Department of Internal Medicine, Hokkaido University School of Medicine pp.1001-1006
Published Date 1967/11/15
DOI https://doi.org/10.11477/mf.1404201844
  • Abstract
  • Look Inside

A crystal pick-up device was described for recording the apexcardiogram. The de-vice consists of the commercial crystal ear-phone with a shunt condencer, as illustrated in Fig. 1. This pick-up is easily constructed, not expensive and is well used with the standard electrocardiograph. Some of the technical property of the device are given in Fig. 2. As shown, the pick-up has the sufficient performance for the recording oflow-frequency vibration of the precordium.

Copyright © 1967, Igaku-Shoin Ltd. All rights reserved.


電子版ISSN 1882-1200 印刷版ISSN 0452-3458 医学書院