雑誌文献を検索します。書籍を検索する際には「書籍検索」を選択してください。

検索

書誌情報 詳細検索 by 医中誌

Japanese

APPLICATION OF SEMICONDUCTOR STRAIN GAGE FOR LONG TERM MEASUREMENT OF INTRACRANIAL PRESSURE Atsushi IKEYAMA 1 , Shigeru MAEDA 1 , Hajime NAGAI 1 , Takeo CHIKU 2 , Isemi IGARASHI 2 12nd Department of Surgery, Nagoya University School of Medicine 2Toyota Central Research&Development Laboratories, Inc. pp.781-786
Published Date 1968/8/1
DOI https://doi.org/10.11477/mf.1406202415
  • Abstract
  • Look Inside

A microminiature transducer has been devised by one of us, which consists of two semiconductor strain gages. The device is very small in size, enough to be able to insert into the intracranial cavity with-out any difficulty, and measures a intracranial pres-sure precisely. The device is a disc shape (3 mm. in diameter, 1 mm. in thickness) and has two di-aphragms of different thicknesses. Semiconductor elements with the same size and performance are connected to these active and dummy diaphragms, respectively. They are connected to a bridge cir-cuit to compensate for temperature effect and reduce noise.

From the fundamental experiment on this device, the following points were confirmed.

1) Output-pressure relation.

The relation between output and pressure repre-sents an excellent linearity under pressures from 0 to 1000 mm. of water.

2) Sensitivity

If the temperature is kept constant, a pressure change less than 20 mm. of water can be detected by this device.

3) Temperature compensation

Temperature compensation in this device is ac-complished by the following three ways. a) Active and dummy gages are connected to a bridge circuit to compensate each other. b) The carbon resist-ance is coupled to one of the gages to correct the performance. c) For the purpose of keeping a con-stant current in the bridge circuit, a high resistance is coupled into the bridge circuit. When the relation between output and pressure at a temperature of 42℃ was shown in a graph, the straight line was obtained. At a temperature of 31.5℃, the deviation was about 5 to 10% from the above.

As one of the parameters of polygraph, the device was used to study cerebral hemodynamics. The ex-perimental and clinical cases using this device were demonstrated, respectively.


Copyright © 1968, Igaku-Shoin Ltd. All rights reserved.

基本情報

電子版ISSN 2185-405X 印刷版ISSN 0006-8969 医学書院

関連文献

もっと見る

文献を共有