| 摘要 |
A safety device for a medical needle (10) has a tubular support (14) for the needle mount end and a tubular protective shield (25) slidably mounted on the support (14) from a set position to a retracted position and then to a locked position where the shield covers the needle. The shield (25) and support (14) are restrained against relative rotational movement. A locking member (18) is rotationally mounted on the support, within the shield, there being a cam follower (22) on the support engaged with a cam profile (21) on the locking member (18) whereby forward axial movement of the support relative to the locking member causes the locking member to rotate relative to the support. The shield (25) has a guide (27) defining a shoulder (32) towards its rearward end and an abutment (23) on the locking member (18) is receivable behind the shoulder when the shield is in its locked position. A spring (38) acts between the locking member (18) and the shield (25) whereby the locking member is in use turned to engage its abutment (23) with the shoulder (32) of the shield when the latter is in its locked position, so preventing subsequent rearward movement (15) thereof. |
