Automatic injection device
First Claim
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1. An automatic injection device comprising:
- a housing, an ampoule holder including an ampoule said ampoule holder being slidably mounted in said housing, a piston slidably mounted within said ampoule, a resilient element for causing said ampoule holder first to slide with respect to said housing from a storage position to a deployed position, secondly causing said piston to slide within said ampoule from a first position to a second position such that a predetermined amount of the content of said ampoule are expelled, means for retracting said ampoule holder to said storage position when said piston has reached said second position, and means for releasable retaining said resilient element in an armed position characterised in that said resilient element causes said ampoule holder to retract to said storage position.
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Abstract
The invention relates to an automatic injection device, which automatically injects a pre-measured quantity of fluid medicine when a tension spring is released. The tension spring moves the ampoule and the injection needle from a storage position to a deployed position when it is released; the content of the ampoule is thereafter expelled by the tension spring forcing a piston forward inside the ampoule. After the fluid medicine has been injected, torsion stored in the tension spring is released and the injection needle is automatically retracted back to its original storage position.
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Citations
10 Claims
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1. An automatic injection device comprising:
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a housing, an ampoule holder including an ampoule said ampoule holder being slidably mounted in said housing, a piston slidably mounted within said ampoule, a resilient element for causing said ampoule holder first to slide with respect to said housing from a storage position to a deployed position, secondly causing said piston to slide within said ampoule from a first position to a second position such that a predetermined amount of the content of said ampoule are expelled, means for retracting said ampoule holder to said storage position when said piston has reached said second position, and means for releasable retaining said resilient element in an armed position characterised in that said resilient element causes said ampoule holder to retract to said storage position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An automatic injection device according to anyone of the claims, characterised in that said releasable retainer is released using an opener preferably provided in a cap located at the distal end of said housing.
Specification