A syringe comprising: a barrel including an interior surface , a proximal end , a distal end , a fluid chamber and a tip at the distal end including an opening to allow fluid to pass therethrough; a plunger rod including a proximal portion having a proximal end with a flange adapted to accept a force applied from a user along a longitudinal centerline of the plunger rod ; a distal portion having a distal end with a stopper adapted to provide a slidable seal with the interior surface of the barrel ; a breakable connection between the proximal portion and the distal portion adapted to break when the force applied by the user exceeds a breaking force; and characterized by an impulse reduction means comprising a first braking surface , a second braking surface , and a gap that separates the first braking surface and the second braking surface in a longitudinal direction, said impulse reduction means being disposed on the plunger rod between the stopper and the flange for reducing a contact impulse between the proximal portion and the distal portion generated when the proximal portion strikes the distal portion in response to the breakable connection breaking; the first braking surface disposed on the proximal portion ; the second braking surface disposed on the distal portion , the second braking surface adapted to slidingly engage with the first braking surface to create a motion-resistive force between the proximal portion and the distal portion ; the first braking surface is sloped with respect to the longitudinal centerline of the plunger rod ; wherein a first gap has a first distance along the longitudinal centerline of the plunger rod separating a most distal portion of the breakable connection from the distal portion , and wherein said first distance of said first gap exceeds a second distance of a second gap separating in the longitudinal direction a most distal portion of the first braking surface from a most proximal portion of the second braking surface . a barrel including an interior surface , a proximal end , a distal end , a fluid chamber and a tip at the distal end including an opening to allow fluid to pass therethrough; a plunger rod including a proximal portion having a proximal end with a flange adapted to accept a force applied from a user along a longitudinal centerline of the plunger rod ; a distal portion having a distal end with a stopper adapted to provide a slidable seal with the interior surface of the barrel ; a breakable connection between the proximal portion and the distal portion adapted to break when the force applied by the user exceeds a breaking force; and characterized by an impulse reduction means comprising a first braking surface , a second braking surface , and a gap that separates the first braking surface and the second braking surface in a longitudinal direction, said impulse reduction means being disposed on the plunger rod between the stopper and the flange for reducing a contact impulse between the proximal portion and the distal portion generated when the proximal portion strikes the distal portion in response to the breakable connection breaking; the first braking surface disposed on the proximal portion ; the second braking surface disposed on the distal portion , the second braking surface adapted to slidingly engage with the first braking surface to create a motion-resistive force between the proximal portion and the distal portion ; the first braking surface is sloped with respect to the longitudinal centerline of the plunger rod ; wherein a first gap has a first distance along the longitudinal centerline of the plunger rod separating a most distal portion of the breakable connection from the distal portion , and wherein said first distance of said first gap exceeds a second distance of a second gap separating in the longitudinal direction a most distal portion of the first braking surface from a most proximal portion of the second braking surface . <EOS>