Reduction of Insertion Force of Medical Devices into Biological Tissues by Vibration.
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概要
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Because friction between the surfaces of a medical device and biological tissues causes pain, it is generally accepted that a lubrication of the surfaces should reduce pain. Therefore silicone oil is used to lubricate the surface of hypodermic needles, but the safety of using silicone oil has not yet been sufficiently discussed. In this study, we investigated the use of mechanical vibration to reduce friction between the surfaces of medical devices and biological tissues as an alternative to lubricants. The vertical force was electrically measured during the insertion of a hypodermic needle into swine muscle tissue. A robotic arm was used to insert the needle. We used three types of piezoelectric elements: type D (the discal piezoelectric element), type M I (the multilayer piezoelectric element [2×3×20mm]), and type M II (the multilayer piezoelectric element [10×10×20mm]), The frequency dependence of the effect of the vibration was assessed in a range of 0 to 10kHz, and we found that insertion force decreased with an increase in frequency. The vibration by the type M II element most markedly reduced the insertion force at the frequency of 10kHz. Under this condition, the insertion force of the hypodermic needle decreased to 69% of that under nonvibration conditions. Since interstitial fluid has non-Newtonian viscosity that reduced with the shear rate in the fluid, the vibration, which increases with this rate, reduces the resistance of fluid flow between the needle and the biological tissue. Thus insertion force can be reduced by the use of vibration. Moreover, since the effect of non-Newtonian viscosity can be expected in the other biological fluids around medical devices such as enteroscopes, this method of reducing friction by vibration may be widely available.
- 一般社団法人 日本生体医工学会の論文
一般社団法人 日本生体医工学会 | 論文
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