Abstract: An operation tool for a fluid injector includes a selective movement mechanism which moves the fluid injector between a first protruding position and a second protruding position in a housing of an outer cylinder. When the fluid injector is at the first protruding position, microneedles of a multi-microneedle device are protruded out to a first distance from the first open end. When the fluid injector is at the second protruding position to discharge a fluid via the microneedles, the microneedles are protruded out to a second distance from the first open end, which is shorter than the first distance. The selective movement mechanism includes a rotational-linear movement conversion mechanism which moves the fluid injector between the first and second protruding positions along a longitudinal center line of the outer cylinder based on a direction and an amount of rotation of the outer cylinder relative to the fluid injector.

Abstract: An operation tool for a fluid injector includes an outer cylinder having a housing extending from a first open end to a second open end, and a selective transfer mechanism provided on the outer cylinder. The selective transfer mechanism moves the fluid injector from an initial position to a first protrusion position and then to a second protrusion position in the housing of the outer cylinder. When the fluid injector is at the initial position, the multi-microneedle device has microneedles retracted from the first open end and positioned inside the housing, when the fluid injector is at the first protrusion position, the microneedles are protruded out to a first distance from the first open end, and when the fluid injector is at the second protrusion position, the microneedles are protruded out to a second distance from the first open end. The second distance is shorter than the first distance.

Abstract: An operation tool for a fluid injector includes a selective movement mechanism which moves the fluid injector between a first protruding position and a second protruding position in a housing of an outer cylinder. When the fluid injector is at the first protruding position, microneedles of a multi-microneedle device are protruded out to a first distance from the first open end. When the fluid injector is at the second protruding position to discharge a fluid via the microneedles, the microneedles are protruded out to a second distance from the first open end, which is shorter than the first distance. The selective movement mechanism includes a rotational-linear movement conversion mechanism which moves the fluid injector between the first and second protruding positions along a longitudinal center line of the outer cylinder based on a direction and an amount of rotation of the outer cylinder relative to the fluid injector.

Abstract: An operation tool for a fluid injector includes a selective movement mechanism which moves the fluid injector between a first protruding position and a second protruding position in a housing of an outer cylinder. When the fluid injector is at the first protruding position, microneedles of a multi-microneedle device are protruded out to a first distance from the first open end. When the fluid injector is at the second protruding position to discharge a fluid via the microneedles, the microneedles are protruded out to a second distance from the first open end, which is shorter than the first distance. The selective movement mechanism includes a rotational-linear movement conversion mechanism which moves the fluid injector between the first and second protruding positions along a longitudinal center line of the outer cylinder based on a direction and an amount of rotation of the outer cylinder relative to the fluid injector.

Abstract: An operation tool includes a mechanism sequentially moving the injector in a space of an outer cylinder among an initial position in which needles of a main body of the device are retracted inside the space, a first position in which the needles protrude to the outside by a first distance, and a second position in which needles protrude to the outside by a second distance shorter than the first distance. Fluid flows from the injector through the needles in the second position. The mechanism has a unit forcing the injector toward the initial position by a magnetic force, first and second stoppers which can be selectively extended/retracted with respect to the outer peripheral wall of the outer cylinder, and an engaging portion which is selectively engaged with these stoppers on the outer peripheral wall of the injector and selectively arranging the injector in the above three positions.

Abstract: An operation tool includes a mechanism sequentially moving the injector in a space of an outer cylinder among an initial position in which needles of a main body of the device are retracted inside the space, a first position in which the needles protrude to the outside by a first distance, and a second position in which needles protrude to the outside by a second distance shorter than the first distance. Fluid flows from the injector through the needles in the second position. The mechanism has a unit forcing the injector toward the initial position by a magnetic force, first and second stoppers which can be selectively extended/retracted with respect to the outer peripheral wall of the outer cylinder, and an engaging portion which is selectively engaged with these stoppers on the outer peripheral wall of the injector and selectively arranging the injector in the above three positions.

Abstract: An operation tool for a fluid injector includes an outer cylinder having a housing extending from a first open end to a second open end, and a selective transfer mechanism provided on the outer cylinder. The selective transfer mechanism moves the fluid injector from an initial position to a first protrusion position and then to a second protrusion position in the housing of the outer cylinder. When the fluid injector is at the initial position, the multi-microneedle device has microneedles retracted from the first open end and positioned inside the housing, when the fluid injector is at the first protrusion position, the microneedles are protruded out to a first distance from the first open end, and when the fluid injector is at the second protrusion position, the microneedles are protruded out to a second distance from the first open end. The second distance is shorter than the first distance.