Patent ID: 8206351
Filing Date: 2012-06-26
Classification: A61M

Abstract:
1. An administration apparatus for medical use which performs administration of a drug using an electric driving source, said apparatus comprising: a drug cartridge having an end closed with a plunger, and containing a drug inside; a cartridge holder for holding the drug cartridge; a piston rod for pressing the plunger held in the drug cartridge to move the plunger; a needle assembly having an injection needle for insertion into a target region and administering the drug that is emitted from the other end of the drug cartridge with a movement of the piston rod; and an air releasing input portion which outputs a starting signal for starting an air releasing operation, a needle-insertion drive portion which moves the injection needle between a position of a needle-removal state and a position of a needle-insertion possible state, an injection drive portion which moves the piston rod, and a control circuit which controls the needle-insertion drive portion and the injection drive portion so as to perform the air releasing operation upon receiving the starting signal of the air releasing input portion, wherein in the air releasing operation, said control circuit executes: a first operation which controls the needle-insertion drive portion to move the injection needle from the position of the needle-removal state to the position of the needle-insertion possible state in a forward direction at a speed lower than a speed of drug administration; a second operation which controls the injection drive portion to move the piston rod by an interval required for the air releasing operation at a speed lower than the speed of drug administration; and a third operation which controls the needle-insertion drive portion to move the injection needle from the position of the needle-insertion possible state to the position of the needle-removal state in a backward direction at a speed lower than the speed of drug administration.