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1. (WO2018103338) PHARMACEUTICAL PRODUCT DELIVERY DEVICE AND ANTI-RETURN MECHANISM THEREOF

Pub. No.:    WO/2018/103338    International Application No.:    PCT/CN2017/093103
Publication Date: Fri Jun 15 01:59:59 CEST 2018 International Filing Date: Tue Jul 18 01:59:59 CEST 2017
IPC: A61M 5/315
A61M 5/178
Applicants: GANSU CHANGEE BIO-PHARMACEUTICAL LIMITED COMPANY
甘肃成纪生物药业有限公司
Inventors: ZHU, Xiaopeng
朱小鹏
HAN, Yitao
韩毅涛
PAN, Junfeng
潘俊锋
LIU, Jian
刘建
Title: PHARMACEUTICAL PRODUCT DELIVERY DEVICE AND ANTI-RETURN MECHANISM THEREOF
Abstract:
An anti-return mechanism for a pharmaceutical product delivery device comprises engagement notches provided on a push rod (4), an engagement protrusion (6) provided in the pharmaceutical product delivery device, and a holding slot (7) comprising an accommodating cavity matching the engagement protrusion (6). The engagement protrusion (6) is provided on a sleeve ring having a gap, and tightly holds the push rod (4) when pressed. The engagement protrusion (6), upon receiving a reversing force from a cylindrical frame (1) on the pharmaceutical product delivery device, is capable of moving in a direction opposite to an injection, and becomes fitted and held in the holding slot (7) and locks with the engagement notches by means of clasping. In the anti-return mechanism, as the cylindrical frame (1) on the pharmaceutical delivery device is pressed, a position of the engagement protrusion (6) is changed such that the engagement protrusion (6) is pushed into the holding slot (7) and tightly engages with the engagement notches, connecting and locking the engagement protrusion (6) with the engagement notches by means of clasping, achieving a tight anti-return and holding effect as well as preventing the push rod (4) from reverse movement.