Sheath for gastrostoma, sheathed dilator, sheath for gastrostoma with insertion aid, gastrostomy catheter kit, and method of splitting sheath for gastrostoma

A sheath for gastrostoma, comprising:

• a cylindrical sheath body having a through-hole forming an inner path and configured to receive a gastrostomy catheter in the inner path;
• a handle protruding from one longitudinal end of the cylindrical sheath body and connected pivotably to the longitudinal end via a hinge section of the cylindrical sheath body;
• and
• a lid connected to the handle via a lid hinge section of the cylindrical sheath body and configured to open and close the inner path in the cylindrical sheath body through pivotation about the lid hinge section,
• wherein the lid is configured to close the inner path when the lid is in a closed position and has a distal end abut against a lid abutting section of the cylindrical sheath body, and open the inner path by pivotation from the closed position in an open direction toward a distal end of the cylindrical sheath body opposite to the longitudinal end, the handle has a stopper projection piece protruding from the handle and positioned along an inner surface of the cylindrical sheath body opposite to the lid abutting section across the inner path, and the stopper projection piece is configured such that when the lid receives a force that causes the lid to pivot from the closed position in the open direction, the stopper projection piece is pressed against the inner surface of the cylindrical sheath body such that pivotation of the stopper projection piece with respect to the cylindrical sheath body is restricted.