LOCKING UNIT FOR COUPLING BODY SECTIONS OF INJECTION DEVICE Russian patent published in 2006 - IPC A61M5/00 

FIELD: medicinal equipment, in particular, locking units which may be used in injection devices comprising disposable part and drive or dosing and driving device adapted for multiple usage.

SUBSTANCE: injection device has front body section, piston, piston stem, rear body section, drive and locking unit for locking members. Front body section comprises reservoir for substance to be injected, and first locking member. Piston is located in reservoir for displacement toward discharge opening for supplying of substance from reservoir. Rear body section is detachably coupled to front body section and is equipped with second locking member which is engaged in stopping manner with first locking member. Drive member is located in rear body section for displacement in working direction and in opposite direction for acting upon piston stem during feeding displacement in working direction. Locking unit for locking members is coupled to drive member for disconnection of locking engagement only in position for disconnection of drive member. Drive for injection device detachably coupled to reservoir module has reservoir and piston located in reservoir for displacement in working direction to supply substance. Rear body section is adapted for coupling with reservoir module. Drive member is disposed in rear body section for longitudinal reciprocation. Blocking slide is adapted for acting upon locking member and is coupled to drive member so that drive is capable of coupling only with reservoir module when drive member is moved to position of disconnection relative to rear body section Reservoir module is detachably connected with drive and has front body section, piston and locking member. Front body section includes piston stem and radial step on its rear surface portion facing side opposite to discharge opening of reservoir. Radial step defines locking member or part thereof.

EFFECT: reduced danger of incorrect dosing of substance to be injected.

27 cl, 22 dwg