Injection device which prevents the return of the piston when deployed Security Systems

摘要

Injection device (1) comprises at least: a Body (3) designed to receive a product to inject, Said Body being provided (3) at its distal end of an injection Needle (7),Said Body (3) with a piston (5) attached to a piston rod (8) capable of moving in the Body (3) between a storage position and an end position and push the injectionProduct or by the injection Needle (7) - means of Protection of the injection Needle (7) comprising at least: a sleeve (6) to cover the injection Needle (7),Said sleeve (6) with respect to the cell Body (3) between at least a First Position, in which the injection Needle (7) is discovered, and a final position,In the injection Needle (7) is at least partially covered - activation means (26) arranged to move the sleeve (6) between the initial and final positions.- means of restraint (16, 31) arranged to hold the sleeve (6) in at least one of the initial and final positions.In which the Plunger (8; 108, 208, 308, 408) comprises at least a first portion (9; 109; 209; 309; 409) and a second portion (10, 110, 210, 310, 410)With the first portion (9; 109; 209; 309; 409) and said second portion (10, 110, 210, 310, 410) axially Connected among themselves and to be able to switch between at least a locked position,In the first portion (9; 109; 209; 309; 409) and said second portion (10, 110, 210, 310, 410) are fixed together along the longitudinal AXIS (a) of said piston rod (8); 108;208, 308, 408), and an unlocked position.In the first portion (9; 109; 209; 309; 409) and said second portion (10, 110, 210, 310, 410) can be separated from one another at least a Predetermined distance along the Axis Lon(a) gitudinal Said Plunger (8; 108, 208, 308, 408), the injection device (1) includes: - locking means (11b, 12a, 12b, 12c, 13th; 111B, 113th, 211, 216a; 311C, 311d,313th, 411, 412D), designed to keep the first portion (9; 109; 209; 309; 409) and said second portion (10, 110, 210, 310, 410) in the locked position.Being located in a first part (11b, 12a, 12b, 12c; 111b; 311C, 211;411) of those means of blocking in said first portion (9; 109; 209; 309; 409) of said piston rod (8); 108, 208, 308, 408) and a second part (13a located 113th 216a 313a,;;;412D) Media Blockade in said second portion (10, 110, 210, 310, 410) of said piston rod (8); 108, 208, 308, 408)Docking between the first and second parts of the media blockade when said first portion (9; 109; 209; 309; 409) and said second portion (10, 110, 210, 310, 410) are in thePosition is blocked, and the injection device (1) comprises: - means of deactivation (11a, 11b, 12b; 111a, 216b, 3a; 3b, 311, 413) designed to release the locking means (11b,12A, 12b, 12c, 13th; 111B, 113th, 211, 216a; 311C 311d, 313th, 411, 412D);Being able to cooperate with such means of Disabling at least one of said first and second Locking means to disengage the first portion (11b, 12a, 12b,12C; 111b; 211; 311C, 311d, 411) of those means of blocking of the second part (13a; Fifth, 216a, 313th, 412D) of those means of blocking and, thus,Allow the first portion (9; 109; 209; 309; 409) and said second portion (10, 110, 210, 310, 410) of said piston rod (8); 108, 208, 308, 408) change to its unlocked position.These modes of deactivation (11a, 11b, 12b; 111a, 216b 3a, 3B;311; 413) designed to operate through the displacement of the piston rod (8); 108, 208, 308, 408) at least before the Plunger (8; 108, 208, 308, 408) reach the position dAnd end of injection.