Safety device for a pre-filled syringe and an injection device
AssigneeSanofi-Aventis Deutschland GmbH
InventorsGareth Roberts, Matthew Ekman
Life of this patent
Estimating the term…
Abstract
A safety device for a pre-filled syringe is proposed that comprises a hollow support body with a helical groove formed into an inner surface thereof, a mounting collar for mounting the pre-filled syringe to the support body, a spinning collar with a helical tongue formed to an outer surface thereof and a torsion spring. The helical groove accommodates the helical tongue. Upon release, the torsion spring is capable of exerting a torque upon the spinning collar which causes the spinning collar to rotate within the support body. The engagement of the helical groove and the helical tongue redirects the rotational movement of the spinning collar to a translatory movement that moves the mounting collar in a proximal direction.
Claims14
A retraction mechanism for an injection device operable to administer a medicament from a pre-filled syringe, the retraction mechanism comprising:
- a first member configured to be attached to the pre-filled syringe, the first member comprising a catch to lock the first member in a retracted position, the catch being deflectable to release the first member from the retracted position;
- and
- a second member including a helical tongue extending outwardly from an outer surface of the second member, the helical tongue being configured to redirect rotational movement of the second member to translatory movement that moves the first member proximally to retract the pre-filled syringe.
A retraction mechanism for an injection device operable to administer a medicament from a pre-filled syringe, the retraction mechanism comprising:
- a first member configured to be attached to the pre-filled syringe, the first member rotationally fixed to and translatable relative to a support body of the injection device, the first member comprising a guide member to engage a corresponding guide channel defined by the support body of the injection device to inhibit rotation of the first member relative to the support body of the injection device;
- and
- a second member being rotatable and translatable relative to the support body of the injection device, the second member comprising a helical tongue extending outwardly from an outer surface of the second member, the helical tongue configured to redirect rotational movement of the second member to translatory movement that moves the first member proximally to retract the pre-filled syringe.
A retraction mechanism for an injection device operable to administer a medicament from a pre-filled syringe, the retraction mechanism comprising:
- a first member configured to be attached to the pre-filled syringe;
- and
- a second member comprising a helical tongue extending outwardly from an outer surface of the second member, the helical tongue configured to redirect rotational movement of the second member to translatory movement that moves the first member proximally to retract the pre-filled syringe,
- wherein the first member comprises a guide member to engage a corresponding guide channel defined by the support body of the injection device to inhibit rotation of the first member relative to the support body of the injection device.
Dependencies are inferred from the claim text.