Retractable syringe
First Claim
1. A single use retractable syringe comprising:
- a hollow barrel;
a needle, engaged in a first end of said hollow barrel, fitted with a first locking portion;
a plunger, slideably disposed in said hollow barrel, fitted with a second locking portion and provided with first and second slots; and
a projection fixed relative to said hollow barrel and projected into one of said first and second slots provided on said plunger whereinsaid first and second correspond to lock portions locking at a particular relative angular position,said first slot orienting the plunger and the locking portions at other than the particular angular position, andsaid second slot orienting the plunger and the locking portions at the particular angular position;
the first slot deviates circumferentially around the plunger to meet the second slot; and
the projection is positioned to pass from the first slot to the second slot on retraction of the plunger.
5 Assignments
0 Petitions
Accused Products
Abstract
A single use retractable syringe (1) comprises a hollow barrel (2), a needle (3) engaged with a first end (4) of the hollow barrel (2) and a plunger (5) slideably disposed in the hollow barrel (2). Corresponding interlocking portions (6,7) are provided on the plunger (5) and needle (3) and are engageable only when radially aligned. The syringe (1) is provided with means for rotating the plunger (5) relative to the needle (3) from an orientation where the corresponding interlocking portions (6,7) are radially non-aligned on an initial depression of the plunger (5) toward the hollow barrel first end (4) to expel air to an orientation where the corresponding interlocking portions (6,7) are radially aligned on a subsequent depression of the plunger (5) to dispense fluid from the hollow barrel (2), thereby enabling the corresponding interlocking portions (6,7) to engage and retract the needle (3) into the hollow barrel (2) on a subsequent retraction of the plunger (5) away from the first end (4) following use.
113 Citations
6 Claims
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1. A single use retractable syringe comprising:
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a hollow barrel; a needle, engaged in a first end of said hollow barrel, fitted with a first locking portion; a plunger, slideably disposed in said hollow barrel, fitted with a second locking portion and provided with first and second slots; and a projection fixed relative to said hollow barrel and projected into one of said first and second slots provided on said plunger wherein said first and second correspond to lock portions locking at a particular relative angular position, said first slot orienting the plunger and the locking portions at other than the particular angular position, and said second slot orienting the plunger and the locking portions at the particular angular position; the first slot deviates circumferentially around the plunger to meet the second slot; and the projection is positioned to pass from the first slot to the second slot on retraction of the plunger. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification