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US 6,267,749 B1Granted
Single use syringe with breakaway plunger
AssigneeSafeguard Medical Limited
InventorsKodobor Miklos, Filippo Filippe
Life of this patent
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Abstract
A syringe is provided that comprises a plunger which is adapted to be locked in place when it is fully compressed. The plunger comprises a frangible section which has a breaking strength less than the holding strength of the locking structure. Thus, if an attempt is made to withdraw the plunger and reuse the syringe after the plunger has been fully compressed, the plunger will break, rather than withdrawing from the syringe barrel.
Claims7
A single-use syringe, comprising:
- a barrel having proximal and distal ends, a longitudinal channel therethrough, and a port at its distal end;
- a plunger adapted to move along said longitudinal channel, at least a portion of the plunger being adapted to conform to an inner surface of the barrel, the plunger comprising a frangible section adapted to break upon application of a selected longitudinal tension;
- and
- an engageable lock for holding a portion of the plunger distal to said frangible section, wherein said lock is capable of holding the portion of the plunger in opposition to a force in excess of said selected longitudinal tension,
- whereby upon engagement of the lock, a proximal force in excess of said selected longitudinal tension applied to the proximal end of the plunger will cause the frangible section to break.
2 more elements
Dependencies are inferred from the claim text.