Patent ID: 9731074
Date: 2017-08-15
CPC Classifications: A61M

Claim:
1. An automatic administration instrument for medical use for injecting a drug solution filled in a syringe, said automatic administration instrument comprising: a body for housing the syringe and an injection needle; a first motor for sliding the syringe within said body in a direction toward a tip of the injection needle such that the tip of the injection needle protrudes from said body; a second motor for moving the drug solution in the syringe to administer the drug solution; and a first switch provided on said body, said first switch for starting an automatic needle insertion in which said first motor and said second motor are activated in sequential order while a part of an exterior of said body is being pressed against a body region of a patient to which the drug solution is to be administered; a second switch provided on said body, said second switch for starting an automatic air releasing in which said first motor and said second motor are activated in sequential order; and a microprocessor, wherein said microprocessor is adapted to activate said first motor when said second switch is pressed with said injection needle turning upward, such that a tip of the injection needle protrudes from said body by sliding the syringe within said body in a direction toward a tip of the injection needle, and thereafter activates said second motor such that air releasing is carried out in a state in which the tip of the injection needle protrudes from said body by moving the drug solution in the syringe to administer the drug solution, and thereafter activates said first motor backward such that the tip of the injection needle is housed in said body, and an rpm of said second motor in the air releasing, which depends on an amount of air to be pushed out from the tip of the injection needle in the air releasing, is previously incorporated in the microprocessor as a program, and said microprocessor is adapted to activate said first motor when the first switch is pressed while the part of the exterior of said body is being pressed against the body region of the patient to which the drug solution is to be administered upon completing the air releasing, such that the tip of the injection needle protrudes from said body to perform needle insertion into the body region of the patient, and thereafter activates said second motor to administer the drug solution.