ADMINISTRATION APPARATUS FOR MEDICAL USE

摘要

An expansion/compression mechanism of a piston rod assembly is composed of a bush shaft, a first cylindrical piston rod that is screwed with the bush shaft, a second cylindrical piston rod that is screwed with the first piston rod, and a piston rod holding member for housing the bush shaft and these piston rods. Therefore, the piston rods move linearly in multiple stages.

主权项

1. An administration apparatus for medical use which performs administration of a drug, said apparatus comprising:
a drug cartridge having an end closed with a plunger, and containing a drug inside; a cartridge holder for housing the drug cartridge; a piston rod for pressing the plunger in the drug cartridge to move the plunger; an injector motor which moves the piston rod; a motor driver which drives the injector motor; a controller which controls the motor driver to control movement of the injection motor; a needle assembly for administering the drug emitted from the other end of the drug cartridge with movement of the piston rod; and an air releasing switch for starting an air releasing operation for releasing air in the drug cartridge and the needle assembly, wherein the controller performs the air releasing operation with the movement of the piston rod when the controller detects that the air releasing switch is pressed, and during the air releasing operation, the piston rod is moved at a speed lower than a speed of the piston rod during the drug administration operation.