Medical connector

A medical connector comprising a first member and a second member,

• wherein a male connecting portion is provided at one of a first end of the first member and a first end of the second member,
• a female connecting portion is provided at the other of the first end of the first member and the first end of the second member,
• a screwing structure is provided at a second end of the first member,
• the male connecting portion is inserted into the female connecting portion, and the first member and the second member are in communication with each other,
• the medical connector includes:
• a dislodgement prevention mechanism that prevents the male connecting portion from dislodging from the female connecting portion;
• a sealing mechanism that connects the male connecting portion and the female connecting portion to each other in a liquid-tight manner;
• and
• a rotation prevention mechanism that prevents the first member from rotating relative to the second member,
• the rotation prevention mechanism includes a first engagement structure provided on the first member, and a second engagement structure provided on the second member so as to be able to abut against the first engagement structure in a circumferential direction, and
• when a direction in which another screwing structure that can be screwed to the screwing structure is rotated in order to screw the other screwing structure to the screwing structure is defined as a tightening direction, the rotation prevention mechanism is configured such that, when a rotational force of a predetermined value or greater is applied to the first member in the tightening direction, one of the first engagement structure and the second engagement structure is plastically deformed by the other, so that the first member can be rotated in both forward and reverse directions relative to the second member.