| 摘要 |
A needle guard ( 1 ) based upon a canting plate ( 6 ) becomes lockingly engaged with the needle ( 2 ) shaft both upon retraction of the needle tip within the guard ( 1 ), and upon any attempt to cause the needle tip to reemerge from the guard ( 1 ). The plate ( 6 ) is positioned to rotate into locking engagement with the shaft of the needle ( 2 ) both when an attempt is made to further withdraw the needle from the needle guard ( 1 ) and when an attempt is made to cause the needle tip to reemerge from the needle guard ( 1 ).
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