Needle bearing medical device with three-position shield
First Claim
1. In a medical device comprising an elongated structure having proximal and distal end sections and an internal liquid passageway, a hollow needle having a point and an opposite end axially mounted at said proximal end section of the elongated structure in communication with said liquid passageway, and a tubular protective shield having first and second end portions, said shield mounted around a portion of said elongated structure and longitudinally movable from a needle-covering position, wherein the first end portion of said should extends beyond said needle point to a needle-exposing position, the improvement comprising:
- a plurality of angular, inwardly-depending raked teeth circumferentially formed along an inner surface of the second end portion of said tubular protective shield;
a plurality of angular, outwardly-extending raked teeth around the distal end section of said elongated structure, the angle of said outwardly-extending teeth being substantially complementary to the angle of the inwardly-depending teeth on said protective shield;
a distal retaining ring extending annularly around the distal end section of said elongated structure for cooperating with said inwardly-depending teeth on said protective shield to releasably hold said shield in a needle-exposing position;
an intermediate retaining ring extending annularly around said elongated structure, between said outwardly-extending teeth and said distal retaining ring, for cooperating with said inwardly-depending teeth on said protective shield to releasably hold said shield in a needle-covering position; and
at least one cut-out in the surface of of said protective shield for facilitating the mounting of said shield around said elongated structure.
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Accused Products
Abstract
Needle-containing medical appliances (e.g., hypodermic syringes, i.v. catheter placement units and phlebotomy apparatus) having tubular shields which are adapted to protect users from injury from contact with the needle are disclosed and claimed. A series of raked teeth on the tubular shield cooperate with raised surfaces on the body of the medical appliance to provide three distinct shield-retaining positions, one of which is adapted to lock the shield around the needle in a substantially non-releasable position.
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Citations
11 Claims
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1. In a medical device comprising an elongated structure having proximal and distal end sections and an internal liquid passageway, a hollow needle having a point and an opposite end axially mounted at said proximal end section of the elongated structure in communication with said liquid passageway, and a tubular protective shield having first and second end portions, said shield mounted around a portion of said elongated structure and longitudinally movable from a needle-covering position, wherein the first end portion of said should extends beyond said needle point to a needle-exposing position, the improvement comprising:
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a plurality of angular, inwardly-depending raked teeth circumferentially formed along an inner surface of the second end portion of said tubular protective shield; a plurality of angular, outwardly-extending raked teeth around the distal end section of said elongated structure, the angle of said outwardly-extending teeth being substantially complementary to the angle of the inwardly-depending teeth on said protective shield; a distal retaining ring extending annularly around the distal end section of said elongated structure for cooperating with said inwardly-depending teeth on said protective shield to releasably hold said shield in a needle-exposing position; an intermediate retaining ring extending annularly around said elongated structure, between said outwardly-extending teeth and said distal retaining ring, for cooperating with said inwardly-depending teeth on said protective shield to releasably hold said shield in a needle-covering position; and at least one cut-out in the surface of of said protective shield for facilitating the mounting of said shield around said elongated structure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification
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- Resources
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Current AssigneeJames J. Schramm
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Original AssigneeJames J. Schramm
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InventorsSchramm, James J.
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Primary Examiner(s)Yasko, John D.
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Application NumberUS07/078,386Time in Patent Office330 DaysField of Search604/198, 604/197, 604/192, 604/187, 604/263US Class Current604/198CPC Class CodesA61M 5/3243 being axially-extensible, e...
