Patent ID: 9439639
Filing Date: 2016-09-13
CPC Classification: A61B

Claim Text:
1. A medical treatment tool comprising: a cylindrical retractor main body which is capable of being placed in an incision; a converter which is detachably installed on an opening end of the retractor main body to close the opening end; and ports which are provided in a plurality of sites of the converter and through which treatment tools are inserted into the retractor main body, a locking unit that locks the converter to the retractor main body to be in a locking state by rotating the converter in an axial rotating direction with respect to the retractor main body by a predetermined angle from a non-locking state where the converter comes into contact with the opening end, wherein the converter can be installed on the opening end at an installation angle which is selected from a plurality of installation angles, and positional relationships of the ports with respect to the retractor main body when the converter is installed on the opening end at the respective installation angles become different from each other, wherein the retractor main body includes an expansion unit that is capable of holding said incision in an expanded state in a predetermined opening direction, and wherein in the plurality of installation angles, positional relationships of the ports with respect to the incision in the opening direction are different from each other, wherein the locking unit: locks the converter to the retractor main body to be in a locking state at a first installation angle; locks the converter to the retractor main body to be in a locking state at a second installation angle that is an angle where the first installation angle is advanced clockwise by a first angle; wherein an angle, which is formed between a perpendicular bisector of a line segment that connects a first port and a second port and the opening direction when the converter is installed on the opening end at the first installation angle, is 115 degrees ±20 degrees.