JPH0298345A - Ultrasonic processing device - Google Patents

Abstract

PURPOSE:To obtain an ultrasonic processing device having an ultrasonic wave transmitting member whose intermediate section has a welded part and having an excellent durability such that no breakage occurs even though a probe is subjected to repeated stress caused by ultrasonic vibration, by locating the welded part at a position other than the nodes of the ultrasonic vibration. CONSTITUTION:A probe 20 is composed of a first member 21 and a second member 22. Further, the rear surface of the second member 22 is welded to the front surface of the first member 21. When a voltage is applied to an ultrasonic vibrator 3, vibration is amplified by a horn 6 and is transmitted to the probe 20. Further, the flanks of the amplitudes of the vibration are located in the connection part between the first member 21 and the horn 6, the welded part 25 between the first and second members 21, 22 and the front end part of the second member 22 while the nodes are located at positions other than the connection part between the first member 21 and the horn 6 and the welded part 25 between the first and second members 21. With this arrangement, the probe 20 does not come off from the welded part 25 even though it is subjected to repeated stress, thereby it is possible to enhance the durability.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ultrasonic treatment device that performs treatments such as prostatectomy and stone destruction using ultrasonic vibrations.

[Conventional technology]

Traditionally, in transurethral resection of the prostate, the affected area
Lm has been removed by cauterizing it with high-frequency current. However, since the cauterized living tissue degenerates and emulsifies in such resection, it is difficult to determine the resection range, and there is a risk that normal tissue may also be resected.

Therefore, recently, resection is performed using an ultrasonic treatment device. This includes patent application No. 601201, patent application No. 60
-210510, etc., a probe constructed of a vibrator or the like that can be inserted into a living body, that is, a structure in which an ultrasonic transducer is connected to the base of a vibration transmission member via a horn, is used. There is. Then, using an endoscope or the like, the tip of a probe is pressed against the prostate gland and ultrasonic vibrations are applied to the tissue to remove it. Of course, this also applies when breaking stones.

In addition, the ultrasonic vibration of the ultrasonic transducer is transmitted to the first transducer, the second transducer
An ultrasonic treatment device that uses a transducer to gradually amplify and transmit the amplified waves to a probe is known, for example, from Japanese Patent Publication No. 500850/1983.

By the way, a general ultrasonic treatment apparatus is constructed as shown in FIG. That is, 1 is a cover that constitutes the grip part 2, and inside this cover 1 is an ultrasonic transducer 3.
is provided. This ultrasonic vibrator 3 is constructed by alternately arranging a plurality of disk-shaped piezoelectric elements 4 and a plurality of electrodes 5. A conical horn 6 is disposed at the rear, and a back mass 7 as a cylindrical backing plate is disposed at the rear. The ultrasonic vibrator 3, the horn 6, and the back mass 7 are firmly tightened and fixed by a bolt 8 that passes through the inside of these and a nut 9 that is screwed onto the bolt 8, and the Langevin type vibrator is It is configured.

Further, a probe 10 as a vibration transmitting member made of a rod-shaped body is connected to the tip of the horn 6.

The probe 10 includes a first member 11 and a second part 4]1
It is composed of 2. The first part +, 111 has a tapered part 11a at the λ end, so it is generally formed by machining, and the second member 12 is a straight tubular body, so it is formed by a pipe. ing. Then, the first member 11 and the second member 12 are manufactured in separate processes, and the probe 10 of a predetermined length is formed by welding them together, and the proximal end 13 of the first member 11 is attached to the horn with a screw. It is fixed at 6. Note that 14 is the first member 1
1 and the second member 12 are shown.

[Problem to be solved by the invention]

By the way, the ultrasonic treatment device configured as described above,
When voltage is applied to the ultrasonic vibrator 3 to cause ultrasonic vibration,
The amplitude of this vibration is amplified by the horn 6 and transmitted to the probe 10, and the node of the amplitude is located at the welded part 14 between the first member 11 and the second member 12 forming the horn 10. .

Although this welded part 14 has undergone thermal metamorphosis and is weakened in terms of strength, the amplitude node is the part where the stress is maximum, and the welded part 14 is strong enough to withstand repeated stress. First, there is a risk that the probe 10 may break at the welded portion 14.

This invention was made in view of the above-mentioned circumstances, and its purpose is to provide an ultrasonic treatment device with excellent durability that will not break even when the probe receives repeated stress from ultrasonic vibrations. It's about doing.

[Means and effects for solving the problems] In order to solve the above 214 problems, the present invention provides a structure in which an ultrasonic transmission member that transmits ultrasonic vibrations of an ultrasonic vibrator has a welded part in the middle. The reason for this is that the welded part is located away from the nodes of ultrasonic vibration.

Also, avoid applying large stress to the relatively weak welded parts of the ultrasonic transmission member, and withstand repeated stress (
, 3 buildings.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings, and the same components as those in the prior art will be given the same numbers and the explanation will be omitted.

FIG. 1 shows the structure and amplitude of an ultrasonic treatment device, and 20 is a probe as an ultrasonic transmission member. The probe 20 is made up of a first member 21 and a second member 22 (1) formed of a βTi alloy material, for example. is formed, and a threaded portion 24 is provided protruding from the end surface of the threaded portion 24.
is removably screwed and fixed into a screw hole 6a at the tip of the horn 6. Further, the second member 22 is formed of a straight tubular body, and the rear end surface of the second member 22 is welded to the front end surface of the first member 21.

That is, the probe 20 has a second position relative to the first member 21.
It is formed to a desired length by welding and connecting members 22, and 25 indicates a welded portion. After welding, the probe 20 formed in this manner is subjected to an age hardening treatment, and is further subjected to a surface polishing treatment, for example, by sandblasting, liquid honing, electrolytic composite polishing, etc., in order to remove an oxide film on the surface and improve surface precision. .

Therefore, when a voltage is applied to the ultrasonic transducer 3, ultrasonic vibrations are generated, which are amplified by the horn 6 and transmitted to the probe 20. The peak of the amplitude of this ultrasonic vibration is located at the connection part of the first member 21 with the horn 6, the welding part 25 between the first member 21 and the second member 22, and the tip of the second member 22. and the joints are
Connection portion of first member 21 with horn 6, first member 21
It is located away from the welded portion 25 between the and second member 22. In other words, by adjusting the length of the first member 21, the welded part 25 is prevented from being located at the nodal part of the amplitude where the stress is maximum, and the structure protects the part that is weakened in strength by welding. There is.

By forming 114 in this way, even if stress is repeatedly applied to the probe 20 due to ultrasonic vibration, the probe 20 will not break from the welded portion 25, and durability can be improved.

In the above embodiment, the probe 20 has a structure in which two parts are connected by welding, but even in a structure in which three or more members are connected by welding, the welded part is the amplitude node. A similar effect can be obtained by removing the

[Effects of the Invention] As explained above, according to the present invention, by removing the welded portion of the ultrasonic transmission member from the node of ultrasonic vibration, it will not break even when subjected to repeated stress, and the durability will be improved. Therefore, it is possible to provide an ultrasonic treatment device with excellent properties.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal side view and a waveform diagram of an ultrasonic treatment apparatus showing an embodiment of the present invention, and FIG. 2 is a longitudinal side view and a waveform diagram of a conventional ultrasonic treatment apparatus. 3... Ultrasonic vibrator, 6... Horn, 20... Probe, 25... Welding part.

Claims (1)

[Claims] It consists of an ultrasonic transducer and an ultrasonic transmission member that is connected via a horn that amplifies the ultrasonic vibrations of the ultrasonic transducer and has a welded part in the middle. An ultrasonic treatment device characterized in that it is positioned away from the joint.