AUTOMATIC ADMINISTRATION INSTRUMENT FOR MEDICAL USE
An automatic administration instrument includes a syringe and a partition wall in the syringe which partitions the syringe into different rooms for respectively holding plural kinds of drug solutions or a drug and a drug solution. A partition-wall driver displaces the partition wall and an injection needle is connected to the syringe. A body cap attached to the administration instrument body so as to cover the injection needle. The syringe, the partition wall, and the body cap are configured such that displacing the partition wall dissolves or mixes the drug solutions or the drug and the drug solution in a state that the injection needle is covered by the body cap.
1 . An automatic administration instrument for medical use for injecting a drug solution filled in a syringe, the automatic administration instrument comprising:
a body for housing the syringe and an injection needle;
a first motor for sliding the syringe within the body in a direction toward the tip of the injection needle such that the injection needle protrudes from the body;
a second motor for operating the syringe to administer the drug solution;
a switch provided on the body, the switch activating the first motor and the second motor in sequential order while a part of the exterior of the body is being pressed against a body region of a patient to which the drug solution is to be administered;
a setting switch for setting a speed at which the drug solution is administered; and
a microprocessor for controlling the first motor and the second motor,
wherein the microprocessor is configured that when the switch is pressed, the first motor is activated such that the injection needle protrudes from the body to perform needle insertion into the body region of the patient, and thereafter the second motor is activated to administer the drug solution, and
the microprocessor is configured that the speed at which the drug solution is administered is varied by the second motor based on the speed set in the setting switch.
2 . An automatic administration instrument as defined in claim 1 , the microprocessor is configured that the second motor is controlled at a constant speed set by the setting switch, so as to make the amount of drug solution to be injected per unit time constant.
3 . An automatic administration instrument as defined in claim 1 , the microprocessor is configured that once the switch is pressed, the first motor and the second motor are operated in sequential order.