Medical injection system
AssigneeBecton Dickinson France
InventorsMaxime Nicolas, Michael Fiard, Gilles Bernede
Life of this patent
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Abstract
A medical injection system comprising: a syringe provided with a barrel, a stopper and an injection needle; a plunger rod which engages with the stopper; an injection lock preventing relative movement of the plunger rod with respect to the barrel; and a needle guard comprising a trigger portion and configured to slidably engage the barrel so as to define a first position covering the injection needle and a second position not covering a predetermined portion of the injection needle. The trigger portion is adapted to disengage the injection lock from the plunger rod when the needle guard moves from the first position to the second position.
Claims14
A medical injection system comprising:
- (a) a syringe provided with:
- (i) a barrel having a proximal-most edge;
- (ii) a stopper in sliding engagement inside the barrel;
- and
- (iii) an injection needle;
- (b) a plunger rod in pushing engagement with the stopper,
- (c) an injection lock engaging the plunger rod wherein a distalmost edge of the injection lock is arranged to lean against the proximal-most edge of the barrel so as to prevent a relative movement of the plunger rod with respect to the barrel;
- and
- (d) a needle guard comprising a rigid leg configured as a trigger portion, said needle guard being configured in sliding engagement with respect to the barrel so as to define a first position in which the needle guard covers the injection needle and a second position in which the needle guard does not cover at least a portion of the injection needle;
- wherein the plunger rod comprises a groove and the injection lock comprises a flexible arm engaged into the groove when the needle guard is in the first position,
- wherein the rigid leg is adapted to contact the flexible arm of the injection lock to disengage the flexible arm from the groove of the plunger rod when the needle guard moves from the first position to the second position, in order to allow a relative movement of the plunger rod with respect to the barrel, and
- wherein the injection lock and the needle guard comprise second position locking means adapted to be engaged in the second position of the needle guard in order to prevent at least a distal movement of the needle guard with regard to the injection lock and prevents a proximal movement of the injection lock with respect to the needle guard, wherein the medical injection system comprises disengagement means fixed with respect to the plunger rod adapted to disengage the second position disengagement means during a distal movement of the plunger rod relative to the barrel, wherein the second position locking means comprises at least one leg provided on one of the injection lock and the needle guard and at least one recess provided on the other of the injection lock and the needle guard, and wherein the disengagement means comprise at least one protrusion positioned on a distal end of the plunger rod.
Dependencies are inferred from the claim text.