| 摘要 |
PROBLEM TO BE SOLVED: To improve stability and the service life by slidably arranging a second needle in a hollow needle, and moving it in both directions for coming close to and separating from a housing front end part by respectively connected slidingly movable pieces. SOLUTION: A needle assembly 1 is composed of a hollow outer needle 2 and an inner needle 3, and a sample housing recessed part 3b is arranged on the tip of the inner needle 3. Heads 2a and 3a to be installed in a sample gathering device 4 are arranged in base end parts of both needles 2 and 3. Slidingly movable pieces 6 and 7 energized by springs 8 and 9 are slidably arranged in a housing 5 of the sample gathering device 4. A tongue-shaped member 14 is arranged on the slidingly movable piece 6, and a hook means 15 is arranged on the slidingly movable piece 7, and they are respectively engaged with a contact plate 12 and a rear wall 5d, and are held in a pulling-in position. When this hold is released, the slidingly movable pieces 6 and 7 move forward by the springs 8 and 9, and the inner needle 3 projects from the inside of the hollow outer needle 2. It is restored to the former state by pulling-in operation. In this way, it can be used without using a special tool. |
