| 摘要 |
A safety device for shielding the sharp tip (36) of a medical needle (12) has a needle mount (10) which either directly supports a medical needle, or indirectly supports the needle for instance where the needle is provided as a part of a syringe. A sleeve (20) is carried directly or indirectly on the needle mount (10) and is slidably movable to a needle shielding position wh ere the sleeve surrounds the needle sharp tip. A spring (30) including forwa rdly projecting spring blades (32) when sufficiently loaded acts on an inter nal conical surface (24) of the sleeve to drive the sleeve to its shielding position and a locking mechanism (26, 34) then locks the sleeve in that posi tion. A camming mechanism (18,33) serves to load the spring blades (32) in t he course of the use of the safety device such that thereafter the interacti on of the blades (32) with the conical surface (24) urges the sleeve to its shielding position, the camming mechanism (18,33) being activated by movemen t of the sleeve to expose the needle for use. |
