| 摘要 |
A needleless injection device comprising a discharge assembly with a retenti on 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 (6 1) 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 integra l 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 t he material of said retention member.
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