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Automatic sheath protection of hypodermic needle

  • US 4,973,317 A
  • Filed: 07/14/1989
  • Issued: 11/27/1990
  • Est. Priority Date: 07/14/1989
  • Status: Expired due to Fees
First Claim
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1. A protective construction for a medical needle having a pointed end for piercing tissue of a patient to inject or withdraw fluid from said patient, said construction automatically providing shielding of said needle pointed end upon extraction of the needle from a patient, comprising:

  • a sheath circumscribing said needle with a first end portion thereof adjacent to said pointed end for piercing said patient'"'"'s tissue with said needle in response to a first applied force; and

    means on said sheath interactive with said patient'"'"'s tissue for delaying extraction of said sheath in response to a second applied force until after extraction of said pointed end from said tissue;

    whereby upon extraction of both said needle pointed end and said sheath from said tissue, said pointed end is automatically disposed within said sheath.

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