Patent ID: 9060826
Filing Date: 2015-06-23
Classification: A61B

Abstract:
1. A bone cement system comprising: a housing that defines at least a throughbore that extends from a proximal end of the housing to a distal end of the housing; a dispenser housing received in the throughbore of the housing that is adapted to receive a bone cement; a plunger releasably coupled to the proximal end of the housing and received into the dispenser housing so that movement of the plunger relative to the dispenser housing dispenses the bone cement from the distal end of the housing, the plunger having a proximal end, a distal end, a throughbore extending from the proximal end of the plunger to the distal end of the plunger, and a cross bore directly communicating with the throughbore of the plunger and extending in a radial direction completely through the plunger; and a pressure release system that is coupled to the housing and that is movable relative to the plunger to release pressure within the dispenser housing, the pressure release system including a body received in the throughbore of the plunger, the body having a distal end that is rotatable within the throughbore of the plunger relative to the cross bore of the plunger between a first position and a second position, without translating the body relative to the plunger along a longitudinal axis of the plunger extending from the proximal end of the plunger to the distal end of the plunger, such that in the first position the distal end of the body blocks the cross bore to prevent bone cement from passing through the cross bore and in the second position the distal end of the body allows bone cement to pass through the cross bore and flow proximately behind a distalmost end of the plunger to relieve pressure at the distalmost end of the plunger, wherein the throughbore of the plunger includes a counterbore disposed at the distal end of the plunger and having an increased diameter relative to the remainder of the throughbore, and the distal end of the body has an increased diameter relative to the remainder of the body such that the distal end of the body forms a shoulder which the counterbore engages to prevent translation of the body along the longitudinal axis of the plunger.