| 摘要 |
A flexible piston rod 2, particularly for use in medicine dispensing devices, comprising a piston 1 and a row of elements 3 each having a top surface and a bottom surface as well as a lateral surface, the top surface of one element being connected to the bottom surface of the adjacent element by a hinge means 4 adapted to allow the two adjacent elements to pivot from a first position where at least a portion of a top surface of one element abuts a corresponding portion of the bottom surface of the adjacent element, the first position corresponding to a rectilinear, relatively stiff configuration of the piston rod2, to a second position wherein the top surface of one element is spaced from the bottom surface of he adjacent element corresponding to a curved configuration of the piston rod, the lateral surface of each element having a first and a second mutually opposed circular cylindrical surface portions incorporating a screw thread 6 for meshing with a corresponding screw thread of an actuator for displacing the piston rod in the longitudinal direction thereof. |
