Cilag International Gmbh

David Johnston

Nigel D Harrison

Tim Barrow-Williams

Rosemary Louise Habeshaw

Nigel Harrison

Matthew Brady

The present invention concerns an injection device with a housing adapted to receive a syringe having a discharge nozzle, the housing having an indicator opening. There is a trigger and a forward drive arranged to act upon the syringe on actuation of the trigger to advance the syringe from a retracted position to an extended position thereby discharging the contents of the syringe through the discharge nozzle. A support member is in contacting juxtaposition with the housing and a return drive is supported by the support member and arranged to act upon the syringe after the contents of the syringe has been discharged so that the syringe can be withdrawn from the extended position to the retracted position. Advantageously, the support member is arranged in the housing so that the second drive does not obscure an inspection of the contents of the syringe through the indicator opening. Hence, it can be clearly determined whether the contents of the syringe have been expelled from the syringe.

Injection device

An injection device () is described. A housing () receives a syringe and includes a return spring () for biasing the syringe from an extended position in which its needle () extends from the housing () to a retracted position in which the it does not. A drive spring () acts on a first drive element () and a second drive element () acts upon the syringe to advance it from its retracted position to its extended position and discharge its contents through the needle. The first drive element () is capable of movement relative to the second () once a nominal decoupling position has been reached. A release mechanism is activated when the first drive element () is further advanced to a nominal release position, to release the syringe () from the action of the drive spring (), whereupon the return spring () restores the syringe () to its retracted position. The nominal decoupling and release positions are defined relative to the syringe (). This may be achieved by interaction between a moving component and a decoupling component () that moves with the syringe as it is advanced.

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Melbourn, United Kingdom

David Johnston