| 摘要 |
Auto-injector for administering a dose of a liquid medicament includes a housing to contain a syringe with a hollow needle and a stopper for sealing the syringe and displacing the medicament (M), the housing having a distal end (D) and a proximal end (P) with an orifice to apply against an injection site. A spring means, upon activation, can push the needle from inside the housing through the orifice and past the proximal end (P), operate the syringe to supply the dose of medicament (M), and retract the syringe with the needle after delivering the medicament (M). An activating means can lock the spring means in a pressurized state prior to manual operation and capable of, upon manual operation, releasing the spring means for injection. |
| 主权项 |
1. Auto-injector for administering a dose of a liquid medicament (M), comprising:
an elongate housing arranged to contain a syringe with a hollow needle and a stopper for sealing the syringe and displacing the medicament (M), the housing having a distal end (D) and a proximal end (P) with an orifice intended to be applied against an injection site, wherein the syringe is slidably arranged with respect to the housing, spring means capable of, upon activation:
pushing the needle from a covered position inside the housing into an advanced position through the orifice and past the proximal end (P),operating the syringe to supply the dose of medicament (M), andretracting the syringe with the needle into the covered position after delivering the medicament (M), activating means arranged to lock the spring means in a pressurized state prior to manual operation and capable of, upon manual operation, releasing the spring means for injection, wherein the spring means is a single drive spring in the shape of a compression spring arranged to be grounded at a distal end in the housing for advancing the needle and for injecting the dose of medicament (M) via a plunger and wherein the drive spring is arranged to have its ground in the housing switched to its proximal end for retracting the syringe, wherein the activating means is arranged as a trigger button laterally arranged on the housing, wherein an interlock sleeve is telescoped in the proximal (P) end of the housing, the interlock sleeve translatable in longitudinal direction between a proximal position and a distal position and biased in proximal direction (P) in a manner to protrude from the housing in the proximal position, wherein the interlock sleeve is arranged to be translated from its proximal position into an intermediate position when pressed against the injection site, wherein the trigger button is arranged to push the interlock sleeve from the intermediate position into the distal position thus releasing the drive spring. |
