Patent ID: 7387616

Claim:
A safe medical needle apparatus, comprising: a needle duct having a needle head and a needle tail; a needle seat in which the needle tail is installed; a safe protecting shell through which the needle duct can pass; and a biasing part through which the needle duct passes; wherein a protuberant stop portion is provided on an outer surface of the needle duct proximate to the needle head, and a maximum size of cross section of the protuberant stop portion is larger than an outer diameter of remainder of the needle duct; wherein one end of the safe protecting shell forms an outlet of the needle duct and the other end forms an inlet of the needle duct, the safe protecting shell includes a biasing part cavity adjacent to the outlet, a protecting cavity, cross section of which is smaller than the biasing part cavity and in which the needle head and the protuberant stop portion can move, a stop portion of the safe protecting shell and a needle seat cavity proximate to the inlet of the needle duct and matching the needle seat, sequentially provided between the outlet of the needle duct and inlet of the needle duct of the safe protecting shell, a size of the stop portion of the safe protecting shell is smaller than a maximum size of the stop portion of the needle duct so that the needle duct is movable therein but the stop portion of the needle duct be stopped thereby, and a side of the biasing part cavity has a releasing port; and wherein the biasing part is elastic and includes a through hole through which the needle duct and the stop portion of the needle duct can pass, under action of an external force, the biasing part is contained in the biasing part cavity of the safe protecting shell and is so biased that the needle duct can pass the through hole, and if the external force is removed, the biasing part is transversally movable towards the releasing port so that the through hole displaces and staggers with the needle duct under action of the elasticity so as to lock the needle duct.