| 摘要 |
A butterfly-needle set has an elongated two-part case forming a pair of transversely open slots. An elongated needle in the case has a pair of generally coplanar and oppositely projecting wings projecting out of the case through the slots. The slots are sufficiently long that the needle can move longitudinally between a front position with the needle projecting from a front end of the case and a rear position with the needle completely within the case. An elastically deflectable spring element projects at a small acute angle toward a rear end of the case into at least one of the slots so as to deflect elastically and allow the needle to move from the front position into the rear position and to block movement of the needle from the rear position into the front position.
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