Abstract: A computer controlled electric syringe includes: a piston unit including a piston being configured to press and move a rubber plug of a cartridge by a second end to discharge a medicinal solution from a cartridge through an injection needle; a ball screw having a screw shaft and a nut portion that is screwed into the screw shaft, the screw shaft being loosely inserted into the hollow portion of the piston through the opening, the nut portion being coupled to the piston; a screw shaft supporting portion rotatably supporting the screw shaft of the ball screw; a rotation preventing portion configured to prevent the nut portion of the ball screw from being rotated; and a piston supporting portion supporting the piston to be movable in an axial direction of the screw shaft along with the nut portion by the rotation of the screw shaft.

Abstract: A computer controlled electric syringe includes: a piston unit including a piston being configured to press and move a rubber plug of a cartridge by a second end to discharge a medicinal solution from a cartridge through an injection needle; a ball screw having a screw shaft and a nut portion that is screwed into the screw shaft, the screw shaft being loosely inserted into the hollow portion of the piston through the opening, the nut portion being coupled to the piston; a screw shaft supporting portion rotatably supporting the screw shaft of the ball screw; a rotation preventing portion configured to prevent the nut portion of the ball screw from being rotated; and a piston supporting portion supporting the piston to be movable in an axial direction of the screw shaft along with the nut portion by the rotation of the screw shaft.

Abstract: An electric syringe according to the invention injects a dental anesthetic by pressing a rubber plug of a cartridge filled with an anesthetic. The electric syringe includes: a push member configured to press and move the rubber plug of the cartridge; a drive motor configured to generate a drive force; a transmission mechanism part configured to transmit the drive force to the push member; and a control unit configured to control a moving of the push member by controlling the drive motor, wherein the control unit controls the drive motor to move the push member to gradually increase an injection speed of the anesthetic in the beginning of the injection and to move the push member to inject the anesthetic in a constant injection speed after a predetermined time has elapsed.

Abstract: An electric syringe according to the invention injects a dental anesthetic by pressing a rubber plug of a cartridge filled with an anesthetic. The electric syringe includes: a push member configured to press and move the rubber plug of the cartridge; a drive motor configured to generate a drive force; a transmission mechanism part configured to transmit the drive force to the push member; and a control unit configured to control a moving of the push member by controlling the drive motor, wherein the control unit controls the drive motor to move the push member to gradually increase an injection speed of the anesthetic in the beginning of the injection and to move the push member to inject the anesthetic in a constant injection speed after a predetermined time has elapsed.