Patent ID: 11944787
Assignee: SANOFI
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. An injector device comprising:
an elongate housing having a proximal end and a distal end, and configured to receive a container of medicament;
a needle sleeve mounted within the elongate housing and moveable between an extended position in which the needle sleeve at least partially extends from the distal end of the elongate housing, and a retracted position in which the needle sleeve is received further within the elongate housing than in the extended position;
a piston rod moveable longitudinally within the elongate housing;
a piston spring configured to bias the piston rod towards the distal end of the elongate housing to engage the container of medicament when received within the elongate housing; and
a release mechanism configured to control actuation of the piston rod, the release mechanism comprising a rotatable member disposed within the elongate housing and in cooperating engagement with the needle sleeve such that movement of the needle sleeve from the extended position to the retracted position causes the rotatable member to rotate within the elongate housing from a first position to a second position, at least one of the rotatable member and the needle sleeve comprising a first guide track extending around at least 90 degrees of a circumference of the rotatable member and at least a portion of the first guide track having a helical or spiral shape, the other of the rotatable member and the needle sleeve comprising a track follower in engagement with the first guide track to rotate the rotatable member;
wherein the rotatable member is in cooperating engagement with the piston rod by a second guide track formed on one of the rotatable member and the piston rod, and a projection formed on the other of the rotatable member and the piston rod, the projection being received within the second guide track, and the second guide track being configured such that in the first position of the rotatable member, the piston rod is prevented from movement under a force of the piston spring, and in the second position of the rotatable member, the piston rod is free to move longitudinally within the elongate housing under the force of the piston spring.