Connector with automatic stopping means for connecting a syringe head to an injection exit

摘要

A compression chamber (14) is formed in a housing (2) around a closing piston (5), and defined upstream by the end wall of the housing and downstream by a peripheral sealing gasket (7) carried by the piston. The closing piston has an internal passage (9) which has an inlet (9a) open into the compression chamber, and an outlet (9b) communicating with an injection outlet. The injection outlet of the connector is located downstream from the gasket which is carried by the rigid and non-deformable piston. The housing is defined in a case (1) and accessible through an injection inlet duct (3) open into the housing through the housing end wall. The housing communicates with the injection outlet. The inlet duct is designed to enable the injection head to be inserted with lateral sealing into the duct towards the housing. The piston can move in the housing and inlet duct between upstream position and downstream position. A spring (12) urges the piston towards the upstream position. The compression chamber is accessible to the liquid injected by the injection head, and communicates with the outlet of the connector. The volume of the compression chamber varies with the displacement of the closing piston so that the withdrawing of the injection head causes the volume of the compression chamber to reduce and excess liquid in the chamber is expelled towards the injection outlet.