Injection device
First Claim
1. An injection device, comprising:
- a housing adapted to receive a syringe having a discharge nozzle;
a drive arranged on actuation to advance the syringe from a retracted position to an extended position through an opening in the housing and discharge the contents of the syringe; and
a locking mechanism which engages the drive with the syringe when the syringe is not in its extended position and which is disengaged from the drive and engages the syringe with the housing when the syringe is in its extended position such that movement of the drive relative to the syringe is prevented when the syringe is advanced from its retracted position to its extended position and movement of the housing relative to the syringe is prevented when the syringe is in its extended position and its contents are being discharged.
2 Assignments
0 Petitions
Accused Products
Abstract
The invention concerns an injection device with a housing adapted to receive a syringe having a discharge nozzle and a plunger. There is a trigger and a drive arranged to act upon the plunger on actuation of the trigger to advance the syringe from a retracted position to an extended position through an opening in the housing. A locking mechanism is arranged in and moveable relative to the housing. The locking mechanism is engaged with the plunger when the syringe is not in its extended position and disengaged from the plunger when the syringe is in its extended position. This means that movement of the plunger relative to the syringe is prevented when, in use, the syringe is advanced from a retracted position to an extended position. Hence the contents of the syringe are not expelled from the syringe during advancement from the retracted position to the extended position. The contents are only expelled when the syringe reaches the extended position.
186 Citations
16 Claims
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1. An injection device, comprising:
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a housing adapted to receive a syringe having a discharge nozzle; a drive arranged on actuation to advance the syringe from a retracted position to an extended position through an opening in the housing and discharge the contents of the syringe; and a locking mechanism which engages the drive with the syringe when the syringe is not in its extended position and which is disengaged from the drive and engages the syringe with the housing when the syringe is in its extended position such that movement of the drive relative to the syringe is prevented when the syringe is advanced from its retracted position to its extended position and movement of the housing relative to the syringe is prevented when the syringe is in its extended position and its contents are being discharged. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification