PROBLEM TO BE SOLVED: To provide a trocar that comprises a space-saving camera deployment mechanism.SOLUTION: A trocar 1 comprises a pipe part 2 for inserting a medical device into a body, and a head part 3. The pipe part 2 includes a pipe part outer cylinder 21 and a pipe part inner cylinder 22. The head part 3 includes a head part outer cylinder and a head part inner cylinder. The pipe part outer cylinder and the head part outer cylinder are integrally formed or integrally joined. The pipe part inner cylinder and the head part inner cylinder are integrally formed or integrally joined. An outer peripheral surface of the pipe part outer cylinder 21 comprises a tapered part whose outside diameter becomes smaller toward a tip part from a rear end part on the side of the head part 3.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】省スペースなカメラ展開機構を備えたトロカールを提供する。【解決手段】医療器具を体内に挿入するためのパイプ部２と、ヘッド部３とを備えたトロカール１であって、パイプ部２は、パイプ部外筒２１とパイプ部内筒２２とを含み、ヘッド部３は、ヘッド部外筒とヘッド部内筒とを含み、パイプ部外筒とヘッド部外筒とは一体に成形または一体に接合されており、パイプ部内筒とヘッド部内筒とは一体に成形または一体に接合されており、パイプ部外筒２１の外周面は、ヘッド部３側の後端部から先端部にかけて外径が小さくなるテーパー部を有する。【選択図】図１
