Auto-injection device with needle protecting cap having outer and inner sleeves
First Claim
1. An injection device comprising:
- a housing adapted to receive a syringe having a discharge nozzle and having a boot that covers its discharge nozzle, so that the syringe is movable between a retracted position in which the discharge nozzle is contained within the housing and an extended position in which the discharge nozzle extends from the housing through an exit aperture, the housing including a return spring for biasing the syringe from its extended position to its retracted position;
a releasable locking mechanism that retains the syringe in its retracted position; and
a housing closure member that can occupy a first position, in which it locates on the housing and prevents the locking mechanism from being released, and a second position, in which it does not prevent the locking mechanism from being released, the first position of the housing closure member being one in which it engages the boot, so that movement of the housing closure member to its second position results in removal of the boot from the syringe;
a drive spring;
a drive that is acted upon by the drive spring and in turn acts upon the syringe to advance it from its retracted position to its extended position and discharge its contents through the discharge nozzle;
a release mechanism operable to release the releaseable locking mechanism, thus allowing the syringe to be advanced by the drive spring from its retracted position to its extended position, and in which the first position of the housing closure member is one in which it prevents the release mechanism from being operated;
a return mechanism, activated when the drive has reached a nominal return position, to release the syringe from the action of the drive spring, whereupon the return spring restores the syringe to its retracted position; and
whereinthe releasable locking mechanism comprises a latch member that is located within the housing and is biased into a position in which the latch member engages a locking surface and the release mechanism acts to move the latch member from the position in which it engages the locking surface into a position in which the latch member no longer engages the locking surface.
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Accused Products
Abstract
An injection device is described having a housing that receives a syringe having a boot that covers its needle. The syringe is biased by a return spring from an extended position to a retracted position. A drive spring advances the syringe from its retracted position to its extended position. A return spring restores the syringe to its refracted position. A releasable locking mechanism retains the syringe in its refracted position. A sleeve can be depressed to release the locking mechanism. A cap covers the sleeve, thus preventing the locking mechanism from being released. When the cap is removed, it takes the boot with it and no longer prevents the locking mechanism from being released. Then, the locking mechanism can be released and the injection cycle begun.
454 Citations
17 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 and having a boot that covers its discharge nozzle, so that the syringe is movable between a retracted position in which the discharge nozzle is contained within the housing and an extended position in which the discharge nozzle extends from the housing through an exit aperture, the housing including a return spring for biasing the syringe from its extended position to its retracted position; a releasable locking mechanism that retains the syringe in its retracted position; and a housing closure member that can occupy a first position, in which it locates on the housing and prevents the locking mechanism from being released, and a second position, in which it does not prevent the locking mechanism from being released, the first position of the housing closure member being one in which it engages the boot, so that movement of the housing closure member to its second position results in removal of the boot from the syringe; a drive spring; a drive that is acted upon by the drive spring and in turn acts upon the syringe to advance it from its retracted position to its extended position and discharge its contents through the discharge nozzle; a release mechanism operable to release the releaseable locking mechanism, thus allowing the syringe to be advanced by the drive spring from its retracted position to its extended position, and in which the first position of the housing closure member is one in which it prevents the release mechanism from being operated; a return mechanism, activated when the drive has reached a nominal return position, to release the syringe from the action of the drive spring, whereupon the return spring restores the syringe to its retracted position; and
whereinthe releasable locking mechanism comprises a latch member that is located within the housing and is biased into a position in which the latch member engages a locking surface and the release mechanism acts to move the latch member from the position in which it engages the locking surface into a position in which the latch member no longer engages the locking surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification