| 摘要 |
A safety intravenous catheter including a housing, a metal needle, a plastic needle and a sheath. The metal needle is slidably fitted in the housing. The metal needle can be extended out of the housing or entirely retracted into the housing. In both the extended and retracted positions, the metal needle can be locked by means of pressing and pulling a depression block of an upper resilient plate formed on top face of the metal needle. A projecting block of a lower resilient plate of the metal needle is engaged in an engaging aperture of the housing, whereby the metal needle is prevented from extending out of the housing so as to ensure safety of medical personnel.
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