PROBLEM TO BE SOLVED: To accurately detect an insertion quantity, etc. even when the outer diameter of an insertion part passing through a trocar changes.SOLUTION: Provided is a sensor unit for a trocar 2 comprises: a base section 2b detachably attached to the trocar, and having a through-hole 2e through which is passed an insertion part 4 which is to be inserted into the trocar a movable member 2c having a pressing surface 2j which constitutes at least a portion of the inner surface of the through-hole 2e of the base section 2b, and arranged movable in a radial direction of the through-hole 2e and a sensor 2d arranged in the movable member 2c and/or the inner surface of the through-hole 2e facing the pressing surface 2j, and detecting the amount of movement of the surface of the insertion part 4 inside the through-hole 2e.SELECTED DRAWING: Figure 4COPYRIGHT: (C)2016,JPO&INPIT【課題】トロッカを貫通する挿入部の外径寸法が変化しても精度よく挿入量等を検出する。【解決手段】トロッカに着脱可能に取り付けられ、トロッカに挿入される挿入部4を貫通させる貫通孔2eを有するベース部2bと、該ベース部2bの貫通孔2eの少なくとも一部の内面を構成する押圧面2jを有し、貫通孔2eの径方向に移動可能に設けられた可動部材2cと、該可動部材2cおよび押圧面2jに対向する貫通孔2eの内面の少なくとも一方に設けられ、貫通孔2e内における挿入部4の表面の移動量を検出するセンサ2dとを備えるトロッカ用センサユニット2を提供する。【選択図】図4
