JP3514506B2 - Bolted ultrasonic vibrator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in the structure of a bolted ultrasonic vibrator incorporated in an ultrasonic surgical instrument.

[0002]

2. Description of the Related Art Ultrasonic surgical instruments utilize ultrasonic vibration to crush tissue, and in recent years, ultrasonic surgical instruments have been used for cataract surgery and the like. An ultrasonic transducer that generates ultrasonic vibration is built in such an ultrasonic surgical instrument. One of such ultrasonic transducers is a bolted ultrasonic transducer.

FIG. 4 shows the concept of a bolted ultrasonic vibrator. In FIG. 4, electrode plates 12 are arranged between and on the outer sides of the plurality of piezoelectric elements 10, and bolts (not shown) are inserted into the central holes of the piezoelectric elements 10, and the blocks 14 as a front member and the rear portion are inserted through the bolts. Blocks 16 as members are connected to each other to form a plurality of piezoelectric elements 10.
Is sandwiched between. Here, blocks 14 and 16
Is a columnar metal member.

A tip 20 as a surgical tool is attached to the tip of the block 14, and the tip vibrates in the longitudinal direction to crush the tissue. The vibration displacement distribution is shown in the lower part of FIG. 4, and a step 100 for reducing the diameter of the block 14 is provided at the position of the second vibration displacement node B when the chip 20 side is viewed from the piezoelectric element 10. There is. As shown in the lower part of FIG. 4, when the cross-sectional area is reduced at the position of the vibration displacement node B, the amplitude increases.

The position of the rear end of the block 16 coincides with the position of the antinode of the vibration displacement, and the position of the tip of the chip 20 also coincides with the position of the antinode of the vibration displacement, and the resonance having the length of one wavelength as a whole. A vibration system is configured. In FIG. 4, 18
Is a case, and the ultrasonic transducer is built in the handpiece.

[0006]

However, in the above-mentioned conventional ultrasonic transducer, the diameter of the block 14 is uniform up to the node B of the second vibration displacement, and the case 18 has the same diameter up to the vicinity of its front end. Since it became thick, the operability was not good because the case and the like contacted the surrounding tissue of the crushed affected area. Further, there is a problem that the field of view is obstructed and the operation cannot be performed smoothly. In particular, the problem was remarkable in an ophthalmic ultrasonic surgical instrument used for cataract surgery.

The present invention has been made in view of the above conventional problems, and an object of the present invention is to provide a bolted ultrasonic vibrator capable of improving operability and visibility.

To achieve the above object, the present invention provides a piezoelectric element having a central hole formed therein for ultrasonic vibration, and a block for sandwiching the piezoelectric element via a bolt inserted into the central hole.
An ultrasonic hand of tissue, including a front member and a rear member as a plug, to which a surgical tool is attached at the tip of the front member.
In bolted ultrasonic transducer for surgical, the bolts
The ultrasonic transducer and the surgical instrument as a whole have a length of one wavelength.
The front member is provided with a first step for reducing the block diameter at the node position of the first vibration displacement on the front side of the piezoelectric element, and further, for the second vibration displacement.
A second step to reduce the block diameter is provided at the node position.
Characterized in that it has been.

The front member as an integrated member
The bolt is integrally formed, and the surgical tool is the front member.
It is characterized by being directly attached to .

[0010]

According to the above construction, since the step is provided at the node position of the first vibration displacement, the diameter of the front member can be reduced to improve the operability and ensure a good visibility. Is possible. In this case, since the step is provided at the position of the vibration displacement node, the amplitude of the vibration can be increased without adversely affecting the ultrasonic vibration.

Further, by providing a step not only at the position of the first vibration displacement node but also at the position of the second vibration displacement node, the front member can be gradually tapered toward the tip,
It is possible to configure a better ultrasonic transducer that is bolted. It is possible to continuously reduce the cross-sectional area of the front member toward the tip to form a conical shape, but it is difficult to manufacture. According to the configuration of the present invention, the conventional problems can be solved with a simple configuration.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings.

[0013] Figure 1 is a concept of real施例bolting ultrasonic transducer according to the present invention is shown. The same members as those of the conventional example shown in FIG. 4 are designated by the same reference numerals, and the description thereof will be omitted.

In FIG. 1, two steps 102 and 104 are formed on the block 14 of the bolted ultrasonic vibrator.
Is provided. That is, as shown in FIG. 1, the first step 102 is formed at the position A of the first vibration displacement from the piezoelectric element 10 toward the front side, and the position of the node B of the second vibration displacement is further formed. A second step 104 is formed at the. The diameter of the portion 14A in FIG. 1 is 1
1 mm, the diameter of the portion 14B is 7 mm, 1
The diameter of the 4C part is 3.7 mm. As shown in Figure 1
In addition, like the conventional example, including the tip 20 which is a surgical tool
It has a length of one wavelength as a whole.

As shown in FIG. 1, by providing such two steps at the node positions of the vibration displacement, the amplitude can be amplified at each step as shown in the lower part of FIG. It is possible to obtain the same action as the conventional one without adversely affecting. In this case, the first step 10
Since the diameter gradually decreases toward the front side by the second and second steps 104, it is possible to prevent the operability from being deteriorated due to the case or the like coming into contact with the tissue around the affected area as described above, and the field of view is further reduced. It is possible to secure and provide a good surgical environment.

FIG. 2 is a sectional view showing a detailed structure of the bolted ultrasonic vibrator shown in FIG. A bolt 14D is passed through the central hole of the piezoelectric element 10, and the block 14 and the block 16 are connected by the bolt 14D. That is, the block 14 is a bolt-integrated block, and a first step is provided at the position of the first vibration displacement node A, and a second step is provided at the second vibration displacement node B. It is provided.

A through hole 26 is formed inside the bolted ultrasonic vibrator, and this through hole 26 is used for liquid injection or suction. In the embodiment shown in FIG. 2, since the chip 20 is directly attached to the block 14 and the bolt 14D is integrally formed,
The integrated member can simplify the structure and configure a robust oscillator. In addition, 24 is an insulating member.

[0018] Figure 3 reference example is shown, the ginseng
Only the first step in the position of the node A of the first vibration displacement in the block 14 is formed in the considered example. Can be obtained even real施例same effect by such a configuration, it is possible to obtain an effect that can be further thinned case. However, when considering the overall operability and vibration conditions, the actual施例is desirable.

[0019]

As described above, according to the present invention, since the steps are provided at the positions of the nodes of the first and second vibration displacements, the operability can be improved and a good field of view can be obtained. The effect is that it can be secured.

[Brief description of drawings]

It is an explanatory view showing a schematic configuration of a real施例ultrasonic transducer according to the present invention; FIG.

2 is a sectional view showing the detailed structure of the real施例.

FIG. 3 is an explanatory diagram showing a schematic configuration of a reference example.

FIG. 4 is an explanatory diagram showing a configuration of a conventional bolted ultrasonic transducer.

[Explanation of symbols]

10 Piezoelectric element 12 electrode plate 14,16 blocks 20 chips 100, 102, 104 steps 18 cases

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-3-79212 (JP, A) JP-A-63-290557 (JP, A) JP-A-3-111036 (JP, A) JP-A-3- 73207 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B06B 1/00-3/04

Claims (2)

(57) [Claims] 1. A front member, comprising: a piezoelectric element having a central hole formed therein and vibrating ultrasonically; and a front member and a rear member as blocks that sandwich the piezoelectric element via a bolt inserted through the central hole. A surgical tool is attached to the tip of the tissue
In a bolted ultrasonic vibrator for ultrasonic surgery, the bolted ultrasonic vibrator and the surgical instrument as a whole
Has a length of one wavelength Te, the front member, the piezoelectric element in the section position of the first vibration displacement of the front side, is provided a first step to reduce the block size, further second Reduce the block diameter to the node position of the second vibration displacement.
A bolted ultrasonic transducer characterized in that a second step is formed . 2. The front member as an integrated member, wherein
A bolt is integrally formed, and the surgical instrument is directly attached to the front member.
The ultrasonic transducer according to claim 1, wherein the ultrasonic transducer is bolted.