| 摘要 |
PROBLEM TO BE SOLVED: To provide a fluid reflux needle being a hollow puncture needle for reflux a medium into the needle pipe in order to cool or warm the surface of a needle pipe, having necessary and sufficient cooling or warming effect and reduced in the invasiveness to the body by making the outer diameter of the needle pipe as possible as fine. SOLUTION: The gap between the inner and outer pipes of a double pipe comprising hollow metal pipes arranged in a concentrically circular state is axially separated into at least two parts by a separation means and one of the partitioned gaps is set to a fluid supply route (forward channel) and the other one of them is set to a fluid discharge route (return channel) and both routes are allowed to communicate with each other at the leading end parts thereof to constitute the needle pipe for refluxing a fluid. The fluid reflux pipe is constituted of this needle pipe, the needle base for fixing the needle pipe at the end part on the base side of the needle pipe, and the fluid supply tube and fluid discharge tube connected to the needle base to allow the fluid supply route and the fluid discharge route to communicate with each other to supply the fluid to the reflux route from the outside and to discharge the fluid to the outside from the reflux route.
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