Syringe with automatically actuated shield
First Claim
1. A hypodermic syringe adapted to receive a container of fluid, said syringe comprising:
- an outer tubular member;
an inner tubular member having chamber means, said inner tubular member being in telescopically slidable relationship within said outer tubular member;
needle support means at a first end of said inner tubular member for attaching a needle assembly;
plunger means mounted to a second opposite end of said inner tubular member, said plunger means being axially movable within said inner tubular member for causing a flow of fluid through said needle assembly and into or out of said container of fluid;
resilient means for biasing said outer tubular member to an extended position whereby said needle assembly is enclosed within said outer tubular member;
latching means on said outer tubular member cooperating with retaining means on said inner tubular member for both securing said outer tubular member in said extended position and for retaining said outer tubular member in a retracted position to expose said needle assembly, said latching means including first lug means for engaging a first keeper adjacent the first end of said inner tubular member and second lug means for engaging the second end of said inner tubular member.
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Accused Products
Abstract
An inner tubular assembly positioned in telescoping arrangement with an outer tubular protective assembly forms a chamber for a fluid receptacle in a hypodermic syringe; it supports a hypodermic needle and a piston plunger to inject fluid from or draw fluid into the receptacle. Biasing means acting between the inner and outer assemblies urge the inner assembly including the outer end of the needle to a retracted position. Levers in the form of finger pieces are pivotally mounted on the outer assembly; the levers are biased to urge the lugs formed at their ends through apertures in the outer assembly and into engagement with a shoulder at the lower end of the inner assembly to latch it in retracted position. When the finger pieces are grasped to use the syringe the latch is actuated to released position. Other lugs at the upper portion of the finger pieces aaaare engageable with a shoulder on the upper portion of the inner tubular assembly to retain the needle in exposed position ready for injection.
133 Citations
17 Claims
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1. A hypodermic syringe adapted to receive a container of fluid, said syringe comprising:
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an outer tubular member; an inner tubular member having chamber means, said inner tubular member being in telescopically slidable relationship within said outer tubular member; needle support means at a first end of said inner tubular member for attaching a needle assembly; plunger means mounted to a second opposite end of said inner tubular member, said plunger means being axially movable within said inner tubular member for causing a flow of fluid through said needle assembly and into or out of said container of fluid; resilient means for biasing said outer tubular member to an extended position whereby said needle assembly is enclosed within said outer tubular member; latching means on said outer tubular member cooperating with retaining means on said inner tubular member for both securing said outer tubular member in said extended position and for retaining said outer tubular member in a retracted position to expose said needle assembly, said latching means including first lug means for engaging a first keeper adjacent the first end of said inner tubular member and second lug means for engaging the second end of said inner tubular member. - View Dependent Claims (2, 3, 4, 5)
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6. A hypodermic syringe comprising:
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an outer tubular member; an inner tubular member having a chamber, said inner tubular member being disposed in telescopically slidable relationship within said outer tubular member; needle support means at a first end of said inner tubular member; plunger means disposed at a second end of said inner tubular member being adapted for engagement with said container of fluid; resilient means for normally biasing said outer tubular member to an extended position whereby when said needle assembly is attached to said inner tubular member said needle assembly is enclosed by said outer tubular member; and manually releasable latching means pivotally secured to said outer tubular member, said latching means including lever means with first engaging means at a first end for latching engagement with a first keeper means on said inner tubular member whereby axial movement between said inner and outer tubular members is prevented when said outer tubular member is in said extended position, said latching means further including second engaging means at a second opposite end of said lever means for latching engagement with a second keeper means on said inner tubular member to retain said outer member in a retracted position whereby said needle assembly is exposed. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A hypodermic syringe adapted to receive a container of fluid, said syringe comprising:
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an outer tubular member; an inner tubular member having chamber means, said inner tubular member being in telescopically slidable relationship within said outer tubular member; needle support means at a first end said inner tubular member for attaching a needle assembly; plunger means mounted to a second opposite end of said inner tubular member, said plunger means being axially movable within said inner tubular member; resilient means for biasing said outer tubular member to an extended position whereby said needle assembly is enclosed within said outer tubular member; latching means on said outer tubular member cooperating with retaining means on said inner tubular member for both securing said outer tubular member in said extended position and for retaining said outer tubular member in a retracted position to expose said needle assembly, said latching means includes first lug means for engaging a first keeper adjacent the first end of said inner tubular member and second lug means for engaging the second end of said inner tubular member. - View Dependent Claims (17)
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Specification