Patent ID: 8414540
Filing Date: 2013-04-09
Classification: A61M

Abstract:
1. A fluid injection system comprising: an injector comprising a drive piston having a plunger engaging end; a syringe comprising a body and a plunger movably disposed within the body, the plunger having a proximal end with at least one coupling member adapted for engagement by the plunger engaging end of the drive piston; and an anti-rotation connection formed by complementary anti-rotation elements associated between the proximal end of the plunger and the plunger engaging end of the drive piston to limit rotation of the plunger within the syringe body, the anti-rotation elements comprising the at least one coupling member engaged in a radial groove defining at least one axial edge formed on the plunger engaging end of the drive piston to enable limited rotational movement of the plunger relative to the drive piston when the complementary anti-rotation elements are engaged.