Metal Bellows Type Gas-liquid Phase-change Actuator

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Other Title
  • 金属ベローズ型気液相変化アクチュエータ
  • キンゾク ベローズガタキエキソウ ヘンカ アクチュエータ ナイシキョウ カ ゲカ シュジュツヨウ ショチグ エ ノ リヨウ
  • —Applications for Endoscopic Surgery Forceps—
  • ―内視鏡下外科手術用処置具への利用―

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Abstract

This paper describes a small and powerful actuator driven by gas-liquid phase-change and its application to a forceps of endoscopic surgery. Recently a video-endoscope has been remarkably enhanced using a CCD which has a higher number of pixels, and used to early check of cancer or endoscopic operation. Necessarily it needs to use a high precision and powerful forceps for fine operation. This powerful actuator consists of 3.45 ml of perfluorocarbon (C5F11NO), a coiled heater, a thermistor and a housing of metal bellows which is made of welded stainless steel disks. This small bellows has an 18 mm of diameter and a 26 mm of length. A power generation process of this actuator is made clear and confirmed for keeping axial force of 20 N by supplying energy of about 3 W. This actuator is applied to a fabricated clamping forceps and confirmed its usability.

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