Patent ID: 9661985
Date: 2017-05-30
CPC Classifications: A61B,B23K,B24B,F16L

Claim:
1. An endoscope having a pipe connection structure, comprising: a pipe of a corrosion-resistant alloy material; and a piping block of a corrosion-resistant alloy material, the piping block having a pipe insertion hole and a clearance hole, the clearance hole configured such that, when the pipe is inserted in the insertion hole, a gap is provided between the pipe and a surface of the clearance hole facing the pipe, a diameter of the clearance hole being larger than a diameter of the pipe insertion hole, the clearance hole being coaxial with the pipe insertion hole, one end of the pipe being configured to connect to the piping block, an other end of the pipe being configured to be connected to an insertion portion of the endoscope that is insertable into a body, wherein an end of the pipe is in the pipe insertion hole, and between the pipe and the piping block laser beam irradiated weld material extends about an entire circumference of an inter-fit area between the end of the pipe and the pipe insertion hole of the piping block, the inter-fit area being the entire immediately pre weld contact area between the pipe and the piping block, the weld material penetrating into the entire inter-fit area, an axial length of the pipe inserted in the pipe insertion hole is in a range of 0.5 to 2 times a wall thickness of the pipe.