Shielded safety syringe
First Claim
1. A shielded syringe assembly comprising an inner syringe cylinder having an open proximal end and a substantially closed distal end, a hypodermic needle supported at and extending outwardly form said distal end, and an outer protective sleeve having an open proximal end and an opening in a substantially closed distal end, said outer sleeve coaxially aligned with and axially advanceable relative to said inner cylinder from a retracted position, where said needle projects outwardly through the opening in said sleeve, to an extended position, where said needle is located within and completely surrounded by said sleeve;
- said inner cylinder having at least one ramp and one stop spaced axially from one another; and
said outer sleeve having a lip formed at the open proximal end thereof;
the continuous axial advancement of said outer sleeve from the retracted position to the extended position causing said lip to ride up the ramp of said inner cylinder and into the space between said ramp and said stop to thereby lock said outer sleeve in the extended position relative to said inner cylinder with said needle shielded by said outer sleeve.
1 Assignment
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Accused Products
Abstract
A disposable syringe having particular application to vacuum tube phlebotomy and comprising respective inner and outer needle carrying and protective cylinders which are coaxially aligned and axially extensible relative to one another. The inner and outer cylinders may be locked in a retracted position, whereby a hypodermic needle is accessible for drawing blood samples from the patient to an evacuated tube at the inner cylinder. After the last blood sample has been taken, the inner and outer cylinders may be locked in an axially extended position, whereby the hypodermic needle is completely surrounded and shielded by the outer protective cylinder so as to permit the safe handling of the syringe while avoiding an accidental needle strike and the possible spread of a contagious disease.
137 Citations
21 Claims
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1. A shielded syringe assembly comprising an inner syringe cylinder having an open proximal end and a substantially closed distal end, a hypodermic needle supported at and extending outwardly form said distal end, and an outer protective sleeve having an open proximal end and an opening in a substantially closed distal end, said outer sleeve coaxially aligned with and axially advanceable relative to said inner cylinder from a retracted position, where said needle projects outwardly through the opening in said sleeve, to an extended position, where said needle is located within and completely surrounded by said sleeve;
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said inner cylinder having at least one ramp and one stop spaced axially from one another; and said outer sleeve having a lip formed at the open proximal end thereof; the continuous axial advancement of said outer sleeve from the retracted position to the extended position causing said lip to ride up the ramp of said inner cylinder and into the space between said ramp and said stop to thereby lock said outer sleeve in the extended position relative to said inner cylinder with said needle shielded by said outer sleeve. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A shielded safety syringe comprising an inner cylinder having proximal and distal ends and a hypodermic needle supported by and extending outwardly from said distal end, said syringe further comprising:
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an outer sleeve having proximal and distal ends and being coaxially aligned with and movable axially relative to said inner cylinder from a retracted position, where said needle projects past the distal end of said outer sleeve, to a distally advanced position, where said needle is located within and completely surrounded by said outer sleeve; first and second locking means being axially spaced from one another and projecting from one of said inner cylinder or said outer sleeve; and third locking means projecting from the other of said inner cylinder or said outer sleeve; the continuous axial movement of said outer sleeve from the retracted position to the distally advanced position causing said third locking means to be received in the space between said first and second locking means to thereby lock said outer sleeve at the distally advanced position with said needle shielded by said outer sleeve. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A shielded safety syringe comprising an inner cylinder having proximal and distal ends and a hypodermic needle supported by and extending outwardly from said distal end, said syringe further comprising:
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an outer sleeve coaxially aligned with and movable axially relative to said inner cylinder from a retracted position, where said needle projects past said outer sleeve, to a distally advanced position, where said needle is located within and completely surrounded by said outer sleeve; first and second locking means being axially spaced from one another and extending around the periphery of one of said inner cylinder or said outer sleeve in parallel alignment with each other; and third locking means projecting from the other of said inner cylinder or said outer sleeve; the continuous axial movement of said outer sleeve from the retracted position to the distally advanced position causing said third locking means to be received in the space between said first and second locking means to thereby lock said outer sleeve at the distally advanced position with said needle shielded by said outer sleeve.
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Specification