Automatic sheath protection of hypodermic needle
First Claim
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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Accused Products
Abstract
Various embodiments of a simple hypodermic needle assembly are described designed to automatically cover the pointed end of the needle after the assembly is used in order to prevent accidental punctures. A sheath circumscribes the needle and includes barbs for interacting with a patient'"'"'s tissue to cause sliding movement of the sheath over the needle pointed end when the needle is withdrawn from the patient. When the needle pointed end is covered, the barbs automatically withdraw and permit the needle sheath combination to be completely withdrawn from the patient.
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Citations
15 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A protective construction for a hypodermic assembly needle to inject or withdraw fluid from a patient, said assembly having both a hollow needle having a pointed end for piercing the tissue of a patient and a hollow body for containing said fluid in communication with said needle, said construction automatically providing shielding of said needle pointed end upon extraction of the needle from a patient and characterized by:
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a sheath circumscribing said needle with a first end portion thereof for piercing said patient'"'"'s tissue with said needle in response to a first applied force said sheath being mounted on said needle for sliding movement thereon between a first position at which said needle pointed end projects beyond said sheath end portion and is exposed, and a second position at which said needle pointed end is disposed within said sheath; a sleeve circumscribing said sheath mounted non-movably relative to said needle; a seat for an end of said sheath opposite said first end whereby at said first position said sheath abuts said seat; a barb projecting from a sidewall of said sheath opposite said needle for interaction with said patient'"'"'s tissue after piercing of the same to move said sheath to said second position in response to a second force applied in a direction opposite to the direction of application of said first applied force; and whereby upon extraction of both said needle pointed end and said sheath from said tissue, said pointed end is automatically disposed within said tissue. - View Dependent Claims (14, 15)
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Specification