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Brain and Nerve No to Shinkei Volume 25, Issue 10 （October 1973）

Brain and Nerve 脳と神経 25巻10号（1973年10月発行）

Japanese English

研究

頭蓋内圧測定用センサーの試作—SFTについて A NEW MINIATURE TRANSDUCER FOR CONTINUOUS MONITORING OF INTRACRANIAL PRESSURE:SFT 米田俊一 ¹ , 松田昌之 ¹ , 清水幸夫 ¹ , 半田譲二 ¹ , 半田肇 ¹ , 小田冨士夫 ² , 松尾耕次 ² , 田口信義 ² Shun-ichi Yoneda ¹ , Masayuki Matsuda ¹ , Yukio Shimizu ¹ , Jyoji Handa ¹ , Hajime Handa ¹ , Fujio Oda ² , Koji Matsuo ² , Nobuyoshi Toguchi ² ¹京都大学医学部脳神経外科 ²松下電器中央研究所開発二部 ¹Department of Neurosurgery, Kyoto University Medical School ²Department of Transducer Development, Central Research Laboratory, Matsushita Electric Industrial Co., Ltd. pp.1305-1308

発行日 1973年10月1日 Published Date 1973/10/1

DOI https://doi.org/10.11477/mf.1406203392

PDF(2800KB)

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Abstract 文献概要
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　硬膜上から頭蓋内圧を正確かつ連続的にしかも高度の安定性・安全性をもつて測定するため，小型の圧力計を開発した。

　この圧力計はSFT素子を使用したもので，従来報告されている他の同種圧力計のいつれよりはるかにすぐれた性特をもつ。

A new device for continuous monitoring of ex-tradural, intracranial pressure is described and its cardinal features are summarized.

A strip of SFT element, 3011 in thickness, 2.4 mm in length and 1.3 mm in width, is bonded on the surface of the metal diaphragm made of 50μ thick stainless steel, and the rim of the diaphragm is fixed at the edge of the cylindrical base. The SFT, a new type semiconductor strain gauge, is the piezoresistive element wherein the thin ger-manium film of less than la in thickness is vacuum deposited on the polyimide film of 30μ in thick-ness. Any elongation given to the SFT causes the resistance increase and vice versa.

The main and innovating feature of this element is that the temperature coefficients of both sensi-tivity and terminal resistance are made sufficiently low while retaining high dauge factor. With this and other features, linear and wide range opera-tions both for positive and nedative pressures are ensured.