JPS62207450A - Handpiece - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] Ultrasonic scalpels that convert high-frequency current into ultrasonic vibrations, transmit and amplify them to the bone that serves as the scalpel at the tip of the handpiece, and crush living tissue. At surgical sites where nerves and other organs are concentrated, cells that need to be removed can be crushed, suctioned, and removed without damaging them, and many of them are also equipped with an irrigation mechanism. It is possible to suction and remove tissue pieces together with physiological saline.

The present invention relates to a handpiece for an ultrasonic scalpel suitable for performing precise and accurate surgery such as microsurgery.

[Prior art]

Surgical tools that utilize the ability to cut or crush living tissue using ultrasonic waves include those used in orthopedic surgery4, those used to cut bones and joints in the general surgery field, cataract surgical tools used in the ophthalmology field, and tools for removing tartar in the dental field. Ultrasonic surgical tools and the like have been put into practical use. These ultrasonic surgical tools generally do not produce the amplitude and power of ultrasonic vibrations that can crush tissue over a wide range, and are used as surgical tools exclusively for extremely limited streetlights. .

The present inventors have previously developed a circuit for an ultrasonic scalpel that generates 1q amplitude and power of ultrasonic vibration that can demonstrate sufficient tissue crushing ability in a wide range of areas of living tissue, a bone that serves as the scalpel part, and a circuit around the surgical site. Invented an ultrasonic scalpel consisting of a system for cleaning, emulsifying crushed cell debris, and suctioning and removing the emulsified cell debris, published in JP-A-58-58034.
It was disclosed in the publication No. 5 (Fig. 5 and Fig. 6). In addition, if the surgical site is relatively close to the body surface or if the surgical method allows for a large streetlight, it is possible to proceed with the surgery effectively without any hindrance, but if the surgical site is deep within the body and If the streetlights are extremely narrow, you will be forced to undergo a very difficult surgery.
In order to improve the long time between surgical sites and the difficulty in performing an appropriate and accurate surgery, a front plate (17) connected to a vibrator (15) as shown in Fig. 7 was used. A handpiece was developed in which a join I-(22) having a length corresponding to an integral multiple of 172 wavelengths was provided between the horns (5) serving as female parts, and the handpiece was disclosed in Japanese Patent Application No. 59-93028.

However, with the advancement and sophistication of medical technology or the expansion of its scope of application. There is a need for surgical tools that are even easier to use. In order to perform precise and accurate surgery, especially in Microlige 1 and 1, a light and short handpiece with a bent horn is required. The piece body becomes longer, and with the method of bending only at the joint, increasing the degree of bending reduces the transmission of ultrasonic waves.
The efficiency of the operation deteriorated, and the vibration amplitude at the tip of the horn could not be increased, creating problems for safe and accurate operation lights.

(Purpose of the Invention) The present invention aims to solve the current problems of surgical tools that utilize ultrasonic vibrations, that is, ultrasonic scalpels. By bending the handpiece at an arbitrary position and/or at a position corresponding to a length shorter than 174 wavelengths from the connecting end surface of the horn, the vibration amplitude at the tip of the horn is large, making it easy to use for a wide range of cases. The purpose is to provide an excellent handpiece for ultrasonic scalpels.

[Structure of the Invention] That is, the present invention connects a horn to a front plate connected to an ultrasonic vibrator, with or without a joint having a length corresponding to an integral multiple of 172 wavelengths of ultrasonic vibration. The handpiece for MA sonic scalpel is characterized in that the front plate is bent at an arbitrary position, and/or at a position corresponding to a short length of 174 waves from the connecting end surface of the horn. It's a hand piece.

A detailed description will be given below with reference to the drawings.

FIG. 1 is an overall view showing an embodiment of the handpiece for ultrasonic scalpel according to the present invention, and FIG. 2 is a diagram showing the internal structure and vibration characteristics of the handpiece according to the present invention shown in FIG. .

The basic structure of this handpiece is the same as that previously disclosed by the present inventors in Japanese Patent Application Laid-open No. 58-5803/I (see Fig. 5, d, J, and Fig. 6). Cable (1) connected to the sonic oscillator, connector (2), grip part (3), protection tube (4), horn (5) which is the ultrasonic female part
), an irrigation pipe (6) that supplies saline etc. to the surgical site, and a horn (5) that supplies this irrigation pipe to the surgical site.
), and a suction pipe (8) for suctioning and removing liquid substances from the surgical site. Connection @(9) is between the grip part (3) and the protection tube (4).
) is a pipe that is mechanically connected with screws, etc. The grip part (3), the connecting tube (9), and the protective tube (4) are made of light and corrosion-resistant metal such as aluminum or duralumin, or synthetic resin, etc., in order to make handling easier and easier for the operator. configured. The horn (5) serving as the ultrasonic scalpel is made of high-frequency material such as ultra-super duralumin or titanium alloy.
The horn (5) is made of a material that has good mechanical vibration transmission properties and is strong against breakage. Suction hole (10) for suctioning and removing cell debris, etc.
This suction hole (10) is connected to the pipe joint 1-(11) connected by an appropriate method to the outside of the protection tube (4).
) to the suction pipe (8).

Next, the internal structure, vibration characteristics, etc. of this handpiece will be explained. A backing plate (16) and a front plate made of a high-tensile metal material such as duralumin or high-tensile aluminum alloy are installed at the front and rear (left and right in FIG. 2) of the vibrator (15), which is an electrostrictive vibrator or a magnetostrictive vibrator. (17) and backing plate (
16), the vibrator (15), and the front plate 17) are tightly connected and fixed to each other by a pole 1 made of a high-tensile metal material (not shown). The bone (5) and the front plate (17) are connected with a set screw (18) made of high-tensile metal honing (1/).
) or similar screws are preferable.

The vibration characteristics of the handpiece having such a configuration are as shown in the lower graph of FIG.

This graph shows the amplitude pattern in the axial direction of each part inside the handpiece, and the amplitude peaks from the axial center J3 of the vibrator (15) to the vicinity of the aperture start part (19) of the σ horn (5). The aperture start part of the vibrator (15) and horn (5) (
19) has an arc shape with a peak near the set screw (18). Also, the left end (20) of the backing plate (16) and the vibrator (1
5) Between the drawing start part (19) of the horn (5) and the tip part (21) of the horn (5), there is a backing plate (16), respectively.
It has a semi-arc shape with maximum amplitude at the left end (20) of the bone (5) and the tip (21) of the bone (5).

The tip of the horn (5), which is one of the features of the ultrasonic scalpel (
21) The large serration of the amplitude is roughly inversely proportional to the ratio of the cross-sectional area of the root of the horn (5) to the cross-sectional area of the tip (21) of the horn (5), so this value may vary depending on the area to be treated, the degree of surgery, etc. By changing the cross-sectional area, bone shapes with various amplitudes can be obtained. The length between the center part of the vibrator (15) where the amplitude is L and the aperture start part (19) of the bone (5) transmits the ultrasonic oscillation frequency and the front plate (17) and the horn (5). 172 of the wavelength calculated from the ultrasonic sound speed,
In other words, it corresponds to the length of half a wavelength. Further, the length between the aperture start portion (19), which is the large diameter portion of the bone (5), and the joint portion of the set screw (18) is made to have a length corresponding to 174 wavelengths.

The handpiece of the present invention has a curved shape as a whole to improve usability, and can be placed at any position on the front plate (17) and/or from the connecting end surface of the horn (5) to the aperture starting part (19). It is bent at an arbitrary position between the wavelengths, that is, at a position corresponding to a length shorter than 174 wavelengths. In addition, J of the embodiment shown in FIGS. 3 and 4: Sea urchin, front plate (17)
The same applies to the case of a handpiece in which a join I-(22) whose length corresponds to an integral multiple of 172 wavelengths is connected between the horn (5) and the join I-(22). In this case, join I-(22)
The shape may be slate, or may be bent. That is, either one of the front plate (17) and the horn (5) may be bent, or both may be bent.In short, there is a joint between the front plate (17) and the horn (5). If it is bent at an angle that is easy to use as a whole, including (22), then J: Yes.

Generally, the bending angle of the entire handpiece is determined by the longitudinal axis of the ultrasonic transducer (15) and the longitudinal axis of the front part (near the tip (21)) of the horn (5). Toga 5 to 9
The angle is 0 degrees, but in cases where the treatment is performed on areas that are in the shadows, those bent at an angle of 90 to 120 degrees or more may also be useful.

In the embodiment shown in FIG. 1 and FIG. 2, the overall length is short like the conventional handpiece shown in FIGS. 5 and 6, but the tip (21) is more inclined than the grip (3). Because of this, it does not block the surgical field of view, making it a lightweight and easy-to-use handpiece.

Additionally, if the joint (22) is connected between the front plate (17) and the horn (5), there will be problems with the overall length being longer and heavier, but compared to the conventional handpiece shown in Figure 7. This allows the overall bending angle to be larger,
Furthermore, as in the embodiments shown in Figs. 3 and 4, it is possible to provide a step or a constricted part in the joint (22) to make the front part of the handpiece thinner and to allow it to be easily drawn in one direction. It is possible to provide an easy-to-use handpiece that does not obstruct the surgical field of view even when performing deep surgery.

〔Effect of the invention〕

Compared to conventional handpieces, the handpiece for ultrasonic scalpels of the present invention is also bent at the front plate, horn, etc., and a larger bending angle can be obtained as a whole, so even if the overall length is short, it is easy to use. Furthermore, by adding a joint, even if the surgical target area is deep inside the body and the streetlights are extremely narrow, the surgery can proceed without obstructing the streetlights, making it possible to perform an appropriately qualified surgery. In addition, compared to the conventional method of bending only the joints, it is ideal for surgery by combining the front plate bent at various pre-prepared angles and the joint horn. It is possible to create a handpiece with a certain angle and length of 1q.

Roughly speaking, in terms of vibration amplitude, compared to the conventional method of bending using only joints, the handpiece according to the present invention has a larger vibration amplitude and obtains a more stable output if the bending angle is the same. It is extremely useful medically.

[Brief explanation of drawings]

FIG. 1 is an overall view showing an embodiment of an ultrasonic scalpel handpiece according to the present invention, and FIG. 2 is a diagram showing the internal structure and vibration characteristics of FIG. 1. Further, FIG. 3 is an overall view showing another embodiment of the present invention, and FIG. 4 is a diagram showing the internal structure and vibration characteristics of FIG. 3. FIG. 5 is an overall view showing a conventional handpiece for an ultrasonic scalpel, and FIG. 6 is a diagram showing the internal structure and vibration characteristics of FIG. Moreover, FIG. 7 is a diagram showing the internal structure and vibration characteristics of another conventional example using a joint. Patent Applicant: Sumitomo Bakelite Co., Ltd. Figure 1 IC>-Reverse drawing hole Figure 2 Figure 5 Figure 6

Claims (4)

[Claims] (1) An ultrasonic scalpel hand with a horn connected to the front plate connected to the ultrasonic vibrator, with or without a joint with a length equivalent to an integral multiple of 1/2 wavelength of the ultrasonic vibration. A hand piece characterized in that the piece is bent at an arbitrary position on the front plate and/or at a position corresponding to a length shorter than 1/4 wavelength from the connecting end surface of the horn. (2) Claims characterized in that the longitudinal axis of the ultrasonic vibrator and the longitudinal axis of the front part of the horn are bent so as to form an angle of 5 to 120 degrees. The handpiece described in paragraph 1. (3) The handpiece according to any one of claims 1 and 2, characterized in that a suction hole is provided through the entire length of the horn and an appropriate position within the joint. (4) Claims 1 and 2, characterized in that an irrigation pipe that opens near the tip of the horn is attached along the axial direction of the handpiece.
The handpiece according to any of paragraph 3.