Endoscope provided with a device for closing a fluid flow circuit, for improved sterilisation

A medical endoscope including an insertion tube connected at an insertion tube proximal part to a control handle and provided at an insertion tube distal part with a distal head, the medical endoscope including at least one fluid circulation circuit in which an obturation device of the at least one fluid circulation circuit is mounted including:

• a piston body fixed to the control handle and in which a piston is movably mounted in displacement between a closed position of the at least one fluid circulation circuit and an open position of the at least one fluid circulation circuit;
• the piston body comprising a sealed obturation section and a sealed interconnection chamber located between the piston and the piston body;
• wherein in the open position, the sealed interconnection chamber ensures communication between a first portion of the at least one fluid circulation circuit and a second portion of the at least one fluid circulation circuit;
• wherein in the closed position, the sealed interconnection chamber communicates with the second portion of the at least one fluid circulation circuit while the sealed obturation section closes the first portion of the at least one fluid circulation circuit;
• the piston including, a piston proximal part cooperating in a sealed manner with the piston body and extending outside the piston body, by a button for actuating the piston, and the piston comprising a piston distal part cooperating in a sealed manner with the piston body to delimit up to a bottom of the piston body;
• an expansion chamber communicating with an outlet vent arranged in the bottom of the piston body;
• the piston proximal part cooperating in a sealed manner with the piston body delimiting up to a proximal end of the piston body;
• a mounting chamber for a head of the piston communicating with an exterior of the piston body;
• the sealed interconnection chamber including a hole passing right through the piston to open out into a cylindrical chamber delimited between the piston and the piston body, by an oblong section located in the open position of the at least one fluid circulation circuit, facing inlet sections for connection to the first portion and to the second portion of the at least one fluid circulation circuit to limit a pressure drop;
• and
• wherein an elastic compression return member is mounted in a compression chamber between the piston distal part and the bottom of the piston body to urge the piston to automatically return the piston to the closed position.