Marc Fiechter,Stefan Burren,Markus Tschirren,Markus Hunziker
申请号：
US15930698
公开号：
US20200268979A1
申请日:
2020.05.13
申请国别(地区):
US
年份:
2020
代理人:
摘要：
A piston rod unit for a device for administering a medical substance delays a release of a mechanism of the device and includes an outer piston rod with a hollow space and a contact face for interacting with a stopper to discharge the substance, and an inner piston rod mounted in the outer piston rod to form a cavity at the distal end of the outer piston rod. The cavity contains a viscous fluid and a fluid displacement element located at least partially in the cavity that is operably or integrally connected to the inner piston rod. During relative movement between the fluid displacement element and the outer piston rod, fluid displacement causes movement resistance, such that mechanism release is delayed. The outer piston rod includes a distal, first piston rod part, comprising the contact face and the cavity, and a second piston rod part adjoining the first.
