Residual monitoring and locking structure and injection device

Abstract

The utility model relates to pen type injection device technical field especially, a kind of residual amount monitoring and locking structure and injection device;Including shell, push rod, clutch, drive rod, limit ring, termination ring and dose setting ring, shell inside fixedly connected limit ring, limit ring inside cover clutch, clutch is away from the end part of limit ring and set termination ring, drive rod is set in shell inside, drive rod one end projects shell, push rod is set in drive rod inside, push rod one end projects drive rod, push rod that projects drive rod passes through termination ring, clutch and limit ring in proper order;Dose setting ring is set in shell end part, dose setting ring is engaged with drive rod and set;Termination ring reciprocates along the axial direction of push rod, for the residual amount monitoring of realizing injection liquid medicine;Push rod termination surface is set on termination ring, injection termination surface is set on push rod, when push rod termination surface and injection termination surface contact, injection locking is carried out;Realize locking function after injection, realize residual amount monitoring function.

Images