Needle free connector with a collapsible resilient membrane fitting and corresponding method

A needle free connector or fluid passage, comprising:

• a valve body comprising:
• a first port;
• a second port;
• and
• an internal surface that extends between the first port and the second port and defining a valve body cavity;
• a hollow resilient membrane disposed in the valve body and having:
• a first end and a second end between which the resilient membrane longitudinally extends, the second end having a through hole that opens into the second port;
• a flank extending between the first end and the second end and located in the valve body cavity of the valve body and fitting with the internal surface, the flank defining an internal cavity of the hollow resilient membrane, the internal cavity extending longitudinally from a through slit located at the first end to the through hole of the second end;
• the slit of the first end being:
• closed when the first end is disposed in the first port so as to occlude the first port or
• opened when the first end is pushed into the valve body so as to create a fluid passage through the first end and the cavity up to the second end.