| 摘要 |
A needle assembly is provided for mitigating penetration injury during an injection into a desired area. The assembly comprises a cannula and a stylet. The cannula includes an axially-disposed passageway and a cannula rim disposed at a distal end thereof. The cannula rim defines a non-cutting edge. The stylet is tapered to a stylet tip at a leading end thereof. The stylet is removably positionable within the passageway of the cannula with the stylet tip being longitudinally extendable beyond the cannula rim. The leading end and the cannula rim collectively form a piercing head. The piercing head facilitates penetration of the cannula into the desired area. Subsequent to penetration, retraction of the stylet tip from beyond the cannula rim facilitates delivery of the medication through the passageway and exposes the non-cutting edge of the cannula rim to mitigate further penetration.
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