| 摘要 |
An autorotating retraction structure of needle seat components of a safe syringe comprises a cylinder (10), a needle seat group (A) and a push rod (20). The needle seat group (A) comprises an annular rotating member (30) and a rotation limiting member (40) pivoted with each other, a passive rotating portion (38) is disposed inside the annular rotating member (30), a non-circular slot (45) is disposed inside the rotation limiting member (40), the passive rotating portion (38) and the non-circular slot (45) form an automatic eccentric rotation device of the needle seat group (A), and a dialing portion (24) and a non-circular section (28) respectively corresponding to the passive rotating portion (38) and the non-circular slot (45) are disposed at a front section of the push rod (20). When the push rod (20) is pushed forward, an engaging slot (31) of the needle seat group (A) and a corresponding engaging stopper (11) of the cylinder (10) autorotate from a limiting locking state to a non-limiting unlocking state through the automatic eccentric rotation device of the needle seat group (A), and at the same time the push rod (20) is embedded in the needle seat group (A), so that it is convenient for a user to retract an injection member (50) and the needle seat group (A) into the cylinder (10) after injection is completed. |
