PROBLEM TO BE SOLVED: To provide a cavitation device and a treatment tool device equipped with a cavitation device, with which it is possible to maintain a cavitation generation amount suited for treatment and achieve reduction in size and diameter.SOLUTION: A cavitation device 2 includes: a watering part 10 that has a Venturi tube structure in which a first flow channel part 10a formed on a tip end side, a second flow channel part 10b having a flow channel diameter smaller than that of the first flow channel part, and a third flow channel part 10c having a flow channel diameter larger than that of the first flow channel part and formed on a base end side with respect to the second flow channel part communicate coaxially, and generates cavitation in a fluid flowing in each flow channel a suction part 11 that suctions the fluid outflowed together with an object which has been fragmented, pulverized, or emulsified by a bubble group emitted from the first flow channel part to the object, and the bubble group and an ultrasonic vibrator 7 that is provided at a tip end part of the watering part and longitudinally vibrates along a longitudinal direction, wherein the watering part 10 and the suction part 11 are coaxially disposed so as to be arranged side by side in a radial direction.COPYRIGHT: (C)2014,JPO&INPIT【課題】処置に適したキャビテーション発生量を維持し、小型細径化できるキャビテーションデバイス及びキャビテーションデバイスを搭載する処置具装置を提供する。【解決手段】キャビテーションデバイス2は、先端側に形成された第1の流路部10a、第1の流路部より流路径の細い第2の流路部10b及び第1の流路部よりも流路径が太く第2の流路部よりも基端側に形成された第3の流路部10cが同軸上に連通するベンチュリ管構造であり、各流路内を流通する流体にキャビテーションを発生させる灌水部10と、第1の流路部から対象物に対して放出された気泡群によって細分化、粉砕、若しくは、乳化された対象物及び気泡群と共に流出された流体を吸引する吸引部11と、灌水部の先端部に設置され、長軸方向に沿って縦振動をする超音波振動子7と、を有し、灌水部10及び吸引部11は、同一軸上で、径方向に並んで配置される。【選択図】図4
