| 摘要 |
A needleless injection device comprising a discharge assembly with a retention member fixed in the assembly, said retention member having a plurality of retention elements (76, 76A) spaced around and adapted to locate on a ram (61) to drive a piston into a cylinder for medicament when in a charged position of the ram, and a release ring (78) surrounding said retention elements to prevent radial outward displacement thereof and discharge of the ram; and wherein axial displacement of said release ring (78) releases said retention elements and causes discharge of the ram. The retention elements are integral with said retention member and each has an enlarged head which can move into and out of engagement with a groove or recess on the ram by deformation of the material of said retention member. |
