A - Human Necessities – 61 – M
Patent
A - Human Necessities
61
M
128/88
A61M 5/00 (2006.01) A61M 5/31 (2006.01) A61M 5/50 (2006.01)
Patent
CA 1123697
ABSTRACT OF THE DISCLOSURE An improvement is provided in a syringe which is adapted to preclude reuse and which is prefilled with a drug solution. The syringe has a hollow syringe barrel with an open distal end adapted to have a needle fixed thereto in fluid communication therewith for dispensing of the drug solution contained therein through the needle, the syringe having an open rear end adapted to be sealed by an elastomeric stopper in sliding engagement with the walls of the syringe barrel. The improvement comprises a plunger assembly including a plunger-rod having a projection at one end, the projection comprising a reduced diameter portion terminating in a flanged tip. The elastomeric stopper has a recess in one end thereof, the recess terminating in an enlarged flange-receiving portion. The diameter of the flanged tip of the projection of the rod is less than the diameter of the flange-receiving portion of the recess of the stopper but is greater than the diameter of said recess of said stopper. The interengaging surfaces of which are con- figured for releasably making engagement. The functional relationship is such that (1) the stopper is not released from the projection of the rod when limited manual withdrawal of the plunger is performed for a vein test prior to the administration of a solution of the drug to be administered due to a close approximation or equilibrium between the withdrawal force necessary to pull the piston back within the cylinder when taking the vein test and the blood pressure of a patient; and (ii) the stopper is dis- connected from the rod, with the stopper remaining in the barrel, when, after the drug has been administered, the plunger is withdrawn within the barrel with a force equal to that necessary to aspirate a new solution into the syringe due to the friction between the plunger and the barrel being greater than the friction between the head of the piston rod and the mating recess in the plunger. This renders the syringe useless for reuse.
276789
Imbert Claude
Richard Jacques
Becton Dickinson-France
Marcus & Associates
LandOfFree
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