Drug solution administration device
A drug solution administration device that detects an administration condition of a drug solution with higher accuracy. The drug solution administration device includes a pusher, a drive mechanism configured to move the pusher forward and backward with respect to a distal end opening of the drug solution container, and a control unit configured to control operation of the drive mechanism. The drive mechanism includes a motor configured to generate driving force for moving the pusher forward and backward, and a rotation detection unit configured to detect rotation of the motor. The control unit has an operation confirmation function of confirming an operating condition of the motor on the basis of a detection result of the rotation detection unit. After confirming that the motor is stopped by the operation confirmation function, the control unit starts reverse rotation of the motor to determine whether or not the pusher moves backward.
1 . A drug solution administration device comprising:
a pusher configured to push a drug solution in a drug solution container filled with the drug solution;
a drive mechanism configured to move the pusher forward and backward with respect to a distal end opening of the drug solution container;
a microcomputer configured to control operation of the drive mechanism,
wherein the drive mechanism includes a motor configured to generate a driving force for moving the pusher forward and backward, and an encoder configured to detect rotation of the motor,
the microcomputer has an operation confirmation function of confirming an operating condition of the motor based on a detection result of the encoder, and
the microcomputer is configured to start a reverse rotation of the motor to determine whether or not the pusher moves backward after confirming that the motor is stopped by the operation confirmation function;
a gasket configured to be slidable on an inner wall of the drug solution container and separable from the pusher, wherein a distal end of the pusher is configured to push the gasket to push the drug solution from within the drug solution container toward the distal end opening of the drug solution container; and
wherein the microcomputer is configured to determine whether or not the pusher is in contact with the gasket by rotating the motor forward after causing the pusher to move backward by reverse rotation of the motor.
2 . The drug solution administration device according to claim 1 , wherein the microcomputer is configured to determine whether or not the pusher is against the gasket based on a value of a current flowing through the motor or rotation speed of the motor.
3 . The drug solution administration device according to claim 1 , wherein the microcomputer is configured to determine whether administration of the drug solution within the drug solution container is completed or a blockage occurs, based on whether or not the pusher is against the gasket.
4 . The drug solution administration device according to claim 1 , wherein the microcomputer is configured to rotate the motor forward after waiting for a lapse of a predetermined period after reversely rotating the motor.
5 . The drug solution administration device according to claim 4 , wherein the predetermined period is a period from when the motor is reversely rotated to when movement of the gasket is stopped.
6 . The drug solution administration device according to claim 1 , wherein the microcomputer is configured to determine that a failure occurs in the motor when the pusher does not move backward when the motor is started to reversely rotate.
7 . A drug solution administration device comprising:
a drug solution container filled with a drug solution;
a gasket configured to be slidable on an inner wall in the drug solution container;
a pusher configured to push the gasket;
a drive mechanism configured to move the pusher forward and backward with respect to a distal end opening of the drug solution container;
a microcomputer configured to control operation of the drive mechanism;
wherein the drive mechanism includes a motor configured to generate driving force for moving the pusher forward and backward, and an encoder configured to detect rotation of the motor;
the microcomputer including an operation confirmation function configured to confirm an operating condition of the motor based on a detection result of the unit encoder;
the microcomputer is configured to determine whether or not the pusher is in contact with the gasket by reversely rotating the motor to cause the pusher to move backward and subsequently rotating the motor forward after confirming that the motor is stopped by the operation confirmation function.
8 . The drug solution administration device according to claim 7 , wherein the microcomputer is configured to determine whether or not the pusher is in contact with the gasket based on a value of a current flowing through the motor or rotation speed of the motor.
9 . The drug solution administration device according to claim 7 , wherein the microcomputer is configured to determine whether administration of the drug solution within the drug solution container is completed or blockage occurs, based on whether or not the pusher is in contact with the gasket.
10 . The drug solution administration device according to claim 9 , wherein the microcomputer is configured to rotate the motor forward after waiting for a lapse of a predetermined period after reversely rotating the motor.
11 . The drug solution administration device according to claim 10 , wherein the predetermined period is a period from when the motor is reversely rotated to when movement of the gasket is stopped.
12 . The drug solution administration device according to claim 7 , wherein the microcomputer is configured to determine that a failure occurs in the motor when the pusher does not move backward when the motor is started to reversely rotate.