Ultrasonic operating apparatus

Abstract

An ultrasonic treatment instrument is provided with an ultrasonic transducer, a probe portion to which ultrasonic wave outputted from the ultrasonic transducer is transmitted, a sheath portion into which the probe portion is inserted detachably, the sheath portion including at a distal end portion thereof, a grasping member rotatably supported so as to face the probe portion, and a handle portion coupled to a proximal end portion of the sheath portion detachably and operating the grasping member such that the grasping member is opened and closed to the probe portion, where the distal end portion of the probe portion includes a cavitation production portion where the distal end portion of the probe portion has, on a face thereof facing the grasping member, a flat face extending so as to intersect a vibration direction of the ultrasonic vibration, and cavitation is produced by the flat face in a state that a body tissue has been grasped between the grasping member and the distal end portion of the probe portion.

1 . An ultrasonic treatment instrument comprising:
 an ultrasonic transducer which produces ultrasonic vibration;   a probe portion which has a distal end portion and a proximal end portion, the proximal end portion being coupled to the ultrasonic transducer, and ultrasonic wave outputted from the ultrasonic transducer is transmitted;   a sheath portion which is formed from a cylinder body having a distal end portion and a proximal end portion and in which the probe portion is inserted detachably, the sheath portion having, at the distal end portion, a grasping member rotatably supported so as to face the probe portion; and   a handle portion which is detachably coupled to the proximal end portion of the sheath portion and operates the grasping member such that the grasping member is opened and closed to the probe portion, wherein   the distal end portion of the probe portion includes a cavitation production portion where the distal end portion of the probe portion has, on a face thereof facing the grasping member, a flat portion extending so as to intersect a vibration direction of the ultrasonic vibration, and cavitation is produced by the flat face in a state that a body tissue has been grasped between the grasping member and the distal end portion of the probe portion.   
   
   
       2 . The ultrasonic treatment instrument according to  claim 1 , wherein
 the cavitation production portion includes a groove portion with an uneven shape on a face facing the grasping member at the distal end portion of the probe portion.   
   
   
       3 . The ultrasonic treatment instrument according to  claim 2 , wherein
 the grasping member includes a fitting portion fitted to the groove portion at the distal end portion of the probe portion.   
   
   
       4 . The ultrasonic treatment instrument according to  claim 2 , wherein
 the groove portion has a flat face provided so as to extend in a direction intersecting the vibration direction of the ultrasonic vibration at an angle of 70° to 90°.   
   
   
       5 . The ultrasonic treatment instrument according to  claim 2 , wherein
 a plurality of the groove portions is formed on the face facing the grasping member at the distal end portion of the probe portion, and   when one wavelength of the ultrasonic vibration is represented as λ, all the groove portions fall within a range from a distal end of the probe portion to λ/8.   
   
   
       6 . The ultrasonic treatment instrument according to  claim 2 , wherein
 a width (w) of the groove portion extending along an axial direction of the probe portion is set so as to fall within a range of λ/200≦w≦λ/16.   
   
   
       7 . The ultrasonic treatment instrument according to  claim 2 , wherein
 the groove portion has a ratio (d/w) of a groove width (w) extending along an axial direction of the probe portion and a depth (d) is set to fall within a range of 0.1≦d/w≦5.   
   
   
       8 . An ultrasonic treatment instrument comprising:
 a flexible pipe portion having a distal end portion and a proximal end portion;   a procedure tool main body disposed at the distal end portion of the flexible pipe portion; and   a procedure tool operation unit disposed at the proximal end portion of the flexible pipe portion, wherein   the procedure tool main body comprises:   an ultrasonic transducer producing ultrasonic vibration,   a cover member having a distal end portion and a proximal end portion and covering a periphery of the ultrasonic transducer, the proximal end portion of the cover member being fixed to the ultrasonic transducer, and   a grasping member pivoted to the distal end portion of the cover member, and including a grasping face grasping a body tissue between the one and a distal end portion of the ultrasonic transducer at a position facing the distal end portion of the ultrasonic transducer; and   the procedure tool operation unit comprises:   a slide mechanism which has a distal end portion and a proximal end portion and whose distal end portion is coupled to the grasping member, and   a handle portion which operates the grasping member such that the grasping member is opened and closed to the distal end portion of the ultrasonic transducer according to operation of the slide mechanism in an axial direction thereof, wherein   the distal end portion of the ultrasonic transducer includes a cavitation production portion where the distal end portion of the ultrasonic transducer has, on a face thereof facing the grasping member, a flat portion extending so as to intersect a vibration direction of the ultrasonic vibration, and cavitation is produced by the flat face in a state that a body tissue has been grasped between the grasping member and the distal end portion of the ultrasonic transducer.   
   
   
       9 . The ultrasonic treatment instrument according to  claim 8 , wherein
 the slide mechanism includes a distal end cover coupled to the grasping member, and   an outer diameter of the distal end cover is smaller than an inner diameter of a channel of an endoscope in which the procedure tool main body is inserted.   
   
   
       10 . The ultrasonic treatment instrument according to  claim 8 , wherein
 the slide mechanism includes a distal end portion and a proximal end portion, the distal end portion of the slide mechanism including an operation wire coupled to the grasping member.   
   
   
       11 . The ultrasonic treatment instrument according to  claim 8 , wherein
 the cavitation production portion includes a groove portion with an uneven shape formed on a face facing the grasping face of the grasping member at the distal end portion of the ultrasonic transducer.   
   
   
       12 . The ultrasonic treatment instrument according to  claim 8 , wherein
 the ultrasonic transducer has an entire length which is half the wavelength of ultrasonic vibration, and   the ultrasonic transducer is fixed to the cover member at a node position of ultrasonic vibration of a quarter wavelength from a distal end portion of the ultrasonic transducer.   
   
   
       13 . The ultrasonic treatment instrument according to  claim 8 , wherein
 the ultrasonic transducer comprises:   a piezoelectric device stacked body comprising a plurality of piezoelectric devices,   a horn expanding vibration amplitude of the piezoelectric device stacked body,   plus and minus electrodes supplying power to the piezoelectric devices,   a backing plate sandwiching the piezoelectric devices and the electrodes between the one and the horn and positioned at a rear end of the piezoelectric device stacked body, and   an inner cover disposed between the plus and minus electrodes and the backing plate, wherein   the inner cover has an inner diameter larger than the backing plate and an entire length longer than the backing plate, and has an outer diameter smaller than an inner diameter of the cover member.   
   
   
       14 . The ultrasonic treatment instrument according to  claim 13 , wherein
 the flexible pipe portion includes a coil shaft having a diameter smaller than that of the cover member, and   the backing plate has a taper with a smooth inclined face at a connecting portion with the coil shaft.   
   
   
       15 . The ultrasonic treatment instrument according to  claim 8 , wherein
 the ultrasonic transducer produces ultrasonic vibration with a frequency of 100±25 kHz.   
   
   
       16 . The ultrasonic treatment instrument according to  claim 14 , wherein
 the coil shaft is provided with an insulating outer tube covering an outer periphery of the coil shaft,   a wire supplying power to the ultrasonic transducer is inserted into the coil shaft, and   the coil shaft is electrically grounded.