Patent ID: 7018365

Claim:
A syringe comprising: a cylindrical syringe barrel having an axis, a distal delivery orifice, and a proximal end; a sliding member positioned on the proximal end of the syringe barrel, the sliding member having an opening made up of a first threaded hole in communication with a second hole and being slidable on the syringe barrel between a first position, at which the first threaded hole is aligned with the axis of the syringe barrel, and a second position, at which the second hole is aligned with the syringe barrel; and a threaded plunger positioned within the syringe barrel for delivery of a fluid from the syringe barrel through the delivery orifice, said threaded plunger comprising a plunger shaft in axial alignment with the axis of the syringe barrel, at least a portion of said plunger shaft having threads sized to engage the threads of the first threaded hole; wherein said plunger shaft passes through the opening in said sliding member, and wherein the sliding member at said first position allows the syringe to be used as a threaded syringe for precisely controlled fluid delivery and the sliding member at said second position allows the syringe to be used as a conventional syringe.