Patent ID: 7959612

Claim:
A device for simultaneously delivering substances from a plurality of syringes that have plungers and barrels, said device comprising: a handle; a syringe barrel supporting structure attached to the handle and constructed to support the barrels of at least first and second syringes; a syringe plunger driving assembly engageable with the plungers of said at least first and second syringes; a screw mechanism useable to advance the syringe plunger driving assembly in a distal direction, thereby causing the syringe plungers to expel substances from the syringes; and a screw mechanism engaging apparatus that allows the screw mechanism to move in a direction that causes the syringe plungers to advance in the distal direction but does not allow the screw mechanism to move in a direction that would cause the syringe plungers to retract in the proximal direction; wherein the syringe plunger driving assembly comprises; i) a yoke assembly having an upper member and a lower member, at least one of said upper and lower members being moveable between an open position and a closed position; ii) a cylindrical shaft engaging bore formed in said yoke assembly, one semi-cylindrical portion of that bore being formed in the upper member and an opposite semi-cylindrical portion of that bore being formed in the lower member; and wherein the semi-cylindrical portion of the bore formed in the upper member is threaded so as to engage the threads on the shaft when the yoke assembly is in the closed position and an opposite semi-cylindrical portion of the bore formed in the lower member is devoid of threads.