| 摘要 |
PROBLEM TO BE SOLVED: To accurately and easily confirm the position of the needle tip by an endoscope by letting an optical fiber receiving an incident light from a light source from the rear end pass from the rear end part of the needle with an injection passage for guiding an infusion left in a needle and facing its tip to the needle tip. SOLUTION: A needle 1 is formed into a dual structure of an outer tube 5 and an inner tube 6 and an optical fiber 7 is sandwiched between both. The outer tube 5 and the inner tube 6 are formed of metal fine tubes (cylindrical cross section), and the inner tube 6 inside is an injection passage 8 for guiding an infusion. The inside diameter of the outer tube 5 and the outside diameter of the inner tube 6 are set to such dimensions as to leave a clearance between the inner circumferential wall of the outer tube 5 and the outer circumferential wall of the inner tube 6, and the optical fiber 7 is sandwiched in the clearance. The optical fiber 7 is entered from the rear end of the needle 1 into the clearance and its tip is faced to the needle tip. A branch tube 2 branched into branch tubes 9, 10 is attached to the rear end of the needle 1, a tube 3 is connected to the branch tube 9, and the rear end of the optical cables 7 for guiding the light from the light source are bundled and stored in the branch tube 10. |
