Laser operating device for intracavitary surgery

The device comprises; a catheter (2) accommodating laser light projecting fibers, a pulse laser oscillator device (1), an acoustic detector (4) detecting the acoustic wave generated from the diseased portion, an acoustic analyzer (5) analyzing the acoustic wave from the acoustic detector (4) and obtaining the amplitude change data and spectrum data of the acoustic wave, and a controller (7) for calculating the optimum condition of the projection of the laser light to be projected to the diseased part depending on the data from the acoustic analyzer (5) and controlling the pulse laser oscillator device (1) based on said optimum condition of the projection. According the the device mentioned above, since the laser light can be projected to the diseased part based on the optimum condition of the projection, it is possible to avoid an occurrence of a risk that a normal blood vessel wall is damaged or carbonized or that a perforation in the blood vessel or new re-stenosis is formed.