| 摘要 |
PROBLEM TO BE SOLVED: To provide a needless injector system capable of effectively preventing infection due to blood, simple in configuration and low in price. SOLUTION: A cylindrical unit 20 keeping an interval between a nozzle and a skin to be a prescribed distance is provided in front of a needleless injector body 2 injecting packed medicinal liquid through the nozzle by driving of an accumulated high pressure. Then, a front face wall provided with an opening part 28 with a diameter according to a maximum width of the injecting flow of the medicinal liquid from the nozzle at the position and with an injecting shaft in its center is provided in front of the skin side of the unit 20. A directivity surface reducing resistance at a time when the liquid flows in a direction from the center of the unit 20 to its outer periphery but contrarily increasing the resistance when it flows from the outer periphery to the center is provided on the front side surface of the front surface wall. Entering of blood to the inside of the unit 20 from the opening part 28 is suppressed by this front surface wall to prevent infection. |
