PROBLEM TO BE SOLVED: To provide a medical instrument which can be transformed freely, and can keep a transformed condition.SOLUTION: The medical instrument, such as a brain spatula 1 used in a brain surgery and an arm etc. that supports a surgical instrument, is very soft, can be freely transformed by bending and twisting, and is a spatula formed of a tin of the purity 97.00-99.99 wt.% so as to keep the transformed condition and not to cause a repulsion, which is used for a surgery and the like to thereby enable more appropriate and efficient treatment.COPYRIGHT: (C)2013,JPO&INPIT【課題】自由に変形させることができ、且つ変形した状態を維持することのできる医療器具の提供。【解決手段】脳外科手術の際に用いられる脳へら1や、手術器具を支持するアーム等の医療器具に関し、非常に柔らかく、曲げたりねじったりして自由に形を変形させられ、且つ変形した状態を維持して反発力が生じないように、純度97.00wt%~99.99wt%の錫で形成したへらで、これを術等で用いることで、より適切な処置が能率よく行える。【選択図】図1