Fluid transfer connector plug, fluid transfer connector socket, fluid transfer connector, and method for connecting fluid transfer connector

A fluid transfer connector comprising:

• a fluid transfer connector plug, comprising:
• a plug body having a proximal end and a distal end, the proximal end allowing a hose to be fixed thereto, the distal end being removably connected to a fluid transfer connector socket, the plug body including a fluid channel communicating with the hose;
• a ring body on an outer periphery of the plug body, the ring body being rotatable relative to the plug body, wherein the ring body is configured to be attached to a rear part of the plug body, the rear part being closer to the proximal end of the plug body than the distal end of the plug body which is inserted into an insertion port of the socket in a state where the plug body is connected to the socket;
• and
• two or more keys or two or more key grooves on the ring body;
• and
• a fluid transfer connector socket, wherein:
• the fluid transfer connector socket is configured to be connected with the fluid transfer connector plug;
• and
• the fluid transfer connector socket comprises key grooves or keys respectively corresponding to the keys or the key grooves of the plug.

A method for connecting a fluid transfer connector including a fluid transfer connector plug and a fluid transfer connector socket, the plug comprising:

• a plug body including a proximal end and a distal end, the proximal end allowing a hose to be fixed thereto, the distal end being removably connected to the socket, the plug body including a fluid channel communicating with the hose;
• a ring body on an outer periphery of the plug body, the ring body being rotatable relative to the plug body;
• and two or more keys or two or more key grooves on the ring body, the socket comprising key grooves or keys respectively corresponding to the keys or the key grooves of the plug, the method comprising:
• inserting the distal end of the plug body into an insertion port of the socket;
• and
• connecting the plug to the socket in a state where the distal end of the plug body is inserted into the insertion port of the socket,
• wherein the connecting the plug to the socket is performed after engaging the keys or the key grooves of the plug with the key grooves or the keys of the socket, and
• wherein a portion of the keys or the key grooves on the ring body is configured to be positioned to a rear part of the plug body, the rear part being closer the proximal end of the plug body than the distal end of the plug body.