Patent ID: 8088104
Filing Date: 2012-01-03
Classification: A61M

Abstract:
1. A retractable safety syringe for preventing accidental needle pricking and needle reuse, the syringe comprising: a syringe body defining a proximal portion and a distal portion; a needle removably engageable to the body distal portion; a piston disposed within the body and biasable to the body proximal portion via a biasing force when the piston is traversed toward the body distal portion, the piston being traversable between an engaged position and a retracted position; a shaft disposed within the body and extending through the proximal portion of the body, traversal of the shaft through the body operative to traverse the piston between the engaged and retracted positions; an expandable brake member, at least partially encircling the shaft, comprising at least two protrusions disposed radially in relation to the shaft and having the same longitudinal position relative to the shaft; wherein a force deflecting the protrusions inward and against the shaft is applied when the brake member is in a braking position, and wherein the brake member is configured to expand radially outward from the shaft so as to be sufficiently disconnected from the shaft to allow the biasing force to retract the piston when the brake member is in a released position.