JPH0546430Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is an ultrasonic surgical instrument, particularly a transmission unit that transmits ultrasonic vibrations from an ultrasonic vibrating unit to the affected area in order to crush tissue in the affected area of a living body. Regarding.

[Prior Art] In ultrasonic surgical instruments, which are widely used in the medical field, ultrasonic vibrations generated by a transducer are amplified in amplitude by a horn or the like and transmitted to the affected area inside the body, thereby crushing the biological tissue, stones, etc., and aspirating the crushed tissue fragments.

According to this type of ultrasonic surgical instrument, since the ultrasonic vibrations used are transmitted to relatively hard materials, elastic tissues absorb the vibrations and are not crushed. It is effective for surgical operations on areas such as the brain and liver, which have a relatively large amount of soft tissue and are rich in blood vessels and nerves.

FIG. 4 shows an example of a conventional ultrasonic surgical instrument.

In the figure, the vibrator section 12 is composed of a vibrator 10 and a horn 14. An oscillator (not shown) is connected to one end of the vibrator 10, and the vibrator 10 converts an electric signal output from the oscillator into ultrasonic vibration. And vibrator 10
A horn 14 is connected to the other end, and this horn 1
For example, the ultrasonic waves generated by the transducer 10 at 4 are
It is amplified about 10 times.

Further, a wire-like flexible transmission section 18 is connected to the tip of the horn 14. That is, by bringing the tip of the transmission section 18 into contact with the affected area 20, the ultrasonic vibrations amplified by the horn 14 are transmitted to the affected area 20 via the transmission section 18, and as a result, the tissue of the affected area 20 is crushed. be done.

The crushed tissue pieces of the affected area 20 are then suctioned through the gap between the transmission section 18 and the protective cover 16 that houses the transmission section 18, and removed from the inside of the living body.

[Problems to be solved by the invention] In the conventional ultrasonic surgical instrument described above, in order to crush stones, etc. deep inside the living body, it is necessary to insert the transmission part 18 into the catheter, urethra, etc. inserted into the living body. Therefore, as described above, the transmission section 18 and the protective cover 16 are made of a flexible material.

However, when the transmission section 18 is formed of a flexible wire, its cross-sectional area becomes small and bending occurs, which poses a problem in that ultrasonic vibrations cannot be sufficiently transmitted to the affected area.

The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to provide an ultrasonic surgical instrument that can efficiently transmit ultrasonic vibrations to an affected area and is equipped with a flexible transmission section. be.

[Means for Solving the Problems] In order to achieve the above object, the ultrasonic surgical instrument according to the present invention includes a transmission section that transmits ultrasonic vibrations to the affected area, which is formed of a plurality of flexible linear members. and are characterized in that they are bundled together at the antinode position of the ultrasonic vibration amplitude.

[Operation] According to the above configuration, since the transmission section is formed of a plurality of flexible linear members, the cross-sectional area of the transmission section can be increased while maintaining flexibility. Moreover, since the transmission parts are bundled together at the antinode position of the ultrasonic vibration amplitude, the vibrations of each linear member can be integrated.
Therefore, this increases the ability to transmit ultrasonic vibrations to the affected area.

[Examples] Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

FIG. 1 shows a preferred embodiment of the ultrasonic surgical instrument according to the present invention. In the figure, A shows the concept of the surgical instrument, and B shows ultrasonic vibration (longitudinal vibration).
The vibration distribution of is shown.

FIG. 2 shows an enlarged view of the area indicated by the dashed-dotted line in FIG. 1, and FIG. 3 shows a - cross section of FIG. 2.

First, the configuration of this ultrasonic surgical instrument will be explained below using FIG. 1A.

The vibrator section 12 is composed of a vibrator 10 and a horn 14. The vibrator 10 oscillates in response to an electric signal from an oscillating section (not shown), and the oscillated ultrasonic vibration is amplified by the horn 14. There is. In addition,
In this embodiment, the vibrator 10 is a bolted Languevin vibrator.

An insertion tube 20 is connected to the transducer section 12, and this insertion tube 20 connects to the transmission section 18 that transmits ultrasonic vibrations.
and a flexible protective cover 16 that houses the transmission section.

Here, the ultrasonic vibrations amplified by the horn 14 are transmitted to the affected area via the transmission section 18, as described above.

As shown in FIGS. 2 and 3, the transmission section 18 is composed of a plurality of transmission lines 19, and in this embodiment, it is composed of seven transmission lines. Note that this transmission line is made of stainless steel, for example.
Materials such as titanium alloy and elastic alloy can be used.

The length of the transmission section 18, that is, the distance between the tip and the horn joint end, is determined according to the wavelength of the ultrasonic vibration oscillated by the vibrator 10. That is, as shown in FIG. 1B, the length is determined so that the tip that contacts the affected area is at the antinode of the vibration amplitude. Further, the entire length of the vibrator section 12 is determined so that the tip of the horn 14 is at the antinode of the ultrasonic vibration amplitude, so that when the vibrator 10 oscillates, the transmitting section 12
A standing wave occurs at 8. Note that this transmission section 1
The length of 8 is determined depending on the surgical purpose, and is formed to be about 1 m, for example.

The transmission lines 19 of the transmission section 18 are bundled together at the antinode of the ultrasonic vibration amplitude to form a bundle section 22 . The bundling method is, for example, brazing, welding, or welding. Alternatively, for example, a metal ring or the like may be used for pressure bonding.
In addition, it is not necessary to provide the bundle portion 22 at all the antinode positions of the ultrasonic vibration, for example, at one antinode position.
It may be provided every other time.

Therefore, each transmission line 19 is connected and fixed to each other at the antinode position of the vibration amplitude.
9 vibrations can be integrated. As a result, the transmission section 1
Even when the device 8 is bent and used, ultrasonic vibrations can be effectively transmitted to the affected area.

Here, the tips of the transmitting portions 18, which are at the antinode of the vibration amplitude, are also bundled together to form a bundle portion 22, thereby preventing energy loss of the ultrasonic waves and effectively achieving ultrasonic vibrations to the affected area.

As described above, this ultrasonic surgical instrument has the transmission section 18
is composed of a plurality of transmission lines 19, the insertion tube 20 can be easily bent and inserted into the living body, and the energy of ultrasonic vibration can be effectively transmitted to the affected area without loss. It is possible to crush the affected area. Note that the crushed affected tissue is suctioned through the gap between the transmission section 18 and the protective cover 16, and further suctioned through a suction hole (not shown) and removed.

[Effects of the invention] As explained above, according to the ultrasonic surgical instrument according to the invention, the transmission section is formed of a plurality of linear members,
Furthermore, since each linear member is bundled with each other at the antinode position of the ultrasonic vibration amplitude, the transmission part can be easily bent and inserted into the living body, and the ultrasonic vibration can be transmitted effectively without losing its energy. It is possible to transmit it to the affected area and crush the affected area. Therefore, stones and the like deep inside the body can be crushed in a short time, and the surgical time can be shortened.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the configuration of the ultrasonic surgical instrument according to the present invention and the distribution of ultrasonic vibrations, FIG. 2 is an enlarged view of the transmission section, and FIG. 3 is a cross-sectional view showing the - cross section of FIG. FIG. 4 is an explanatory diagram showing a conventional ultrasonic surgical instrument. 10... Vibrator, 12... Vibrator section, 14...
Horn, 18...Transmission section, 19...Transmission line, 20
...Insertion tube, 22...Bundle part.

Claims (1)

[Claims for Utility Model Registration] An ultrasonic surgical instrument that has a transmission section that transmits vibrations from an ultrasonic vibration section and that crushes living tissue at the tip of the transmission section, wherein the transmission section is flexible. 1. An ultrasonic surgical instrument comprising a plurality of flexible linear members, each of which is bundled together at an antinode position of an ultrasonic vibration amplitude.