A surgical tool can include a main unit and a first rigid sheath. The main unit includes an inner tube that is received within an outer tube. The first rigid sheath removably receives the main unit and connects to the main unit via a coupling between a first connector portion of the main unit and a second connector portion of the rigid sheath. The first rigid sheath can be completely removed from the main unit when the first connector portion is decoupled from the second connector portion. A different rigid sheath having a different shape from the shape of the first rigid sheath can then be removably attached to the main unit instead of the first rigid sheath. A surgical tool kit includes a plurality of rigid sheaths having different shapes and having the ability to be removably attached to the main unit.外科用ツールは、本体と第１の硬質シースとを含む。本体は、外管内に受け入れられる内管を含む。第１の硬質シースは、取り外し可能に本体を受け入れて、本体の第１の連結部と硬質シースの第２の連結部との間の連結を介して本体に連結する。第１の硬質シースは、第１の連結部が第２の連結部から切り離されたとき、本体から完全に取り外すことができる。その後、第１の硬質シースの形状と異なる形状を有する異なる硬質シースを第１の硬質シースの代わりに本体に取り外し可能に取り付けることができる。外科用ツールキットは、さまざまな形状を有し、かつ本体に取り外し可能に取り付けることができる複数の硬質シースを含む。
