Patent ID: 8974417
Filing Date: 2015-03-10
Classification: A61B,A61M

Abstract:
1. A needle for an endoscope, comprising: an outer sheath tube having a cylindrical shape, an inside of the outer sheath tube being a fluid passage; a hollow needle for discharging a fluid supplied through the fluid passage, the hollow needle being housed in the fluid passage; and an operating device that is operated at a proximal end of the outer sheath tube, for extending the hollow needle from a distal end of the fluid passage and retracting the hollow needle into the fluid passage; wherein the outer sheath tube comprising a diameter-reduced portion being formed at the distal end of the outer sheath tube; a hole is formed at the diameter-reduced portion so as to directly communicate with the flow passage; the hollow needle comprising a sealing member being brought into close contact with the diameter-reduced portion when the hollow needle extends from the distal end of the outer sheath tube; the hollow needle is provided so as to be capable of advancing and retracting in the fluid passage and so as to be allowed to protrude and retract a needle tip of the hollow needle from the hole such that a proximal end of the hollow needle remains within the outer sheath tube; the proximal end of the hollow needle directly communicates with the fluid passage within the outer sheath tube; and when the fluid is supplied to the fluid passage in a state where the needle tip of the hollow needle protrudes from the hole, the fluid flows into the hollow needle through the proximal end of the hollow needle, and then is discharged from the needle tip.