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Retractable needle/syringe devices for blood collection, catheterization, and medicinal injection procedures

  • US 4,988,339 A
  • Filed: 12/30/1988
  • Issued: 01/29/1991
  • Est. Priority Date: 12/30/1988
  • Status: Expired due to Fees
First Claim
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1. A retractable hypodermic needle/syringe device adapted for use in fluid collection and dispensing procedures, comprising:

  • an elongated, substantially tubular housing, said housing having a first end portion and an opposite second end portion, said second end portion having an opening therethrough;

    a barrel member disposed within said housing and being formed with a front end portion adjacent said second end portion of said housing and a closed back end portion, said barrel member slidably translatable within said housing forwardly from a first position to a second position and back again;

    a hollow hypodermic needle disposed adjacent said second end portion of said housing in fixed engagement with said front end portion of said barrel member, said needle formed with a first open end extending into said barrel member and a second open end axially aligned with said opening in said second end portion of said housing, said second open end of said needle passing through said opening and projecting out of said housing upon forward translation of said barrel member to said second position;

    translation means for forwardly translating said barrel member within said housing from said first position to said second position;

    locking means cooperating with said translation means for automatically releasably locking said barrel member in said second position and thereby maintaining said second open end of said needle in a projected state without assistance from the user of said device;

    drawing and dispensing means slidably received within said barrel member, said drawing and dispensing means adapted to draw fluid into and dispense said fluid from said barrel member via said needle; and

    resilient means disposed within said housing to bias said barrel member in said first position, said resilient means yieldingly urging said barrel member forwardly to said second position in response to operation of said translation means so as to project said second open end of said needle from said housing, said resilient means resiliently urging said barrel member back to said first position in response to the release of said locking means such that said second open end of said needle fully retracts into said housing.

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