JPH11318920A - Hand piece for ultrasonic treatment device for surgery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hand piece high in safety and reliability by bending or curving the hand piece in an optimum position to reduce driving voltage and failure such as a crack of the hand piece. SOLUTION: Organism tissue is spalled, emulsified and suction-eliminated or incised and coagulated by ultrasonic vibration. In this case, the cross-sectional area of a second node part or the second node part onward of ultrasonic vibration counting from the end side of a hand piece, or the cross-sectional area in the vicinity of the node part is made larger than the tip cross-sectional area of the hand piece, and the node part or the vicinity of the node part is bent or curved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a handpiece of an ultrasonic treatment apparatus for a surgical operation having a function of crushing, emulsifying, aspirating and removing or incising and coagulating a living tissue by ultrasonic vibration.

[0002]

2. Description of the Related Art A living tissue is crushed and emulsified by ultrasonic vibration.
As shown in FIG. 3, for example, as shown in FIG. 3, a handpiece of an ultrasonic treatment apparatus for a surgical operation having a function of performing suction removal or incision / coagulation includes an ultrasonic vibrator 1, a vibration transmitting member (joint) 2,
It is composed of a vibration transmitting member (chip) 3 and a casing 4. The ultrasonic vibrator 1 includes a vibrating element 6, an insulating plate 7, an electrode plate 8, a front metal block 9, a backing metal block 10, a vibrator tightening bolt 11, and the like. The ultrasonic vibration generated by the ultrasonic vibrator 1 is transmitted to the vibration transmitting member (joint) 2, and the amplitude is expanded by the vibration transmitting member (tip) 3 to reach the tip. This is shown in the vibration distribution of FIG.

In recent years, in order to improve the usability of the handpiece, a bent or curved handpiece as shown in FIG. 3 has been required. As a bending type handpiece, Japanese Utility Model Application Laid-Open No. Sho 61-22581 discloses a method of bending the handpiece at the abdomen of the vibration distribution, but the ultrasonic vibration in the direction perpendicular to the axial direction is attenuated. In addition, there is a problem that it is necessary to increase the driving voltage in order to generate a desired amplitude. 62-207
No. 450 discloses a method of bending at a position corresponding to a length shorter than よ り λ wavelength from the connection end face of the horn, but it is not a desirable method for the same reason as described above. Japanese Utility Model Laid-Open No. 63-88311 discloses a method in which a handpiece is bent at a plurality of joints. There is a problem that bending stress and vibration stress increase and cracks are easily generated.

[0004]

In general, a bending or bending handpiece tends to have a high driving voltage, which may cause a problem in safety such as an increase in patient leakage current. Further, not only bending stress but also vibration stress is applied to the bent portion, so that metal fatigue is likely to occur, which may lead to a failure such as a crack.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object to reduce the driving voltage of the handpiece and to position the handpiece at an optimum position in order to reduce failures such as cracks. The object of the present invention is to provide a safe and reliable handpiece by bending or bending the handpiece.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a handpiece of a surgical ultrasonic treatment apparatus for crushing, emulsifying and removing or incising and coagulating a living tissue by ultrasonic vibration, which is counted from the distal end of the handpiece. A second or subsequent node of the ultrasonic vibration or a cross-sectional area near the node is larger than a cross-sectional area at the tip of the handpiece, and the node or the vicinity of the node is bent or curved. It is a handpiece of the ultrasonic treatment device for surgery.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to embodiments. FIG. 1 is a view (cross-sectional view) showing an embodiment of a handpiece of the ultrasonic treatment apparatus for a surgical operation according to the present invention. In this figure, 1 is an ultrasonic transducer, 2 is a vibration transmitting member (joint), 3 is a vibration transmitting member (chip), 4 is a casing, and 5 is a flange for holding a handpiece. The vibration distribution and the vibration stress distribution when the handpiece is driven at the resonance frequency are also shown in FIG.

In the present invention, the vibration transmitting member (joint) 2 is bent at a node. This bent portion corresponds to the second node of the ultrasonic vibration counted from the end of the handpiece. The different points from the conventional bending position are that the bending position is a node and the cross-sectional area of the bending part is large.
Is a point. Since it is bent at the node, attenuation of the ultrasonic vibration in the direction orthogonal to the axial direction can be suppressed. In addition, since this cross section has a large cross-sectional area, vibration stress is smaller than that of a section having a small cross-sectional area, and bending stress is applied to the bent section, but has sufficient mechanical strength as compared with a section having a small cross-section. ing. Therefore, a node having a large cross-sectional area is an optimal position to bend from the viewpoint of vibration transmission efficiency and mechanical strength.

FIG. 4 shows the result of measuring the drive voltage of the handpiece necessary to generate a desired amplitude at the tip of the vibration transmitting member (tip) 3 by changing the bending position of the handpiece. In FIG. 4, the vertical axis indicates the driving voltage (V) of the handpiece. The abscissa indicates the length (mm) from the node to the bending position, with + representing the tip side of the handpiece and-representing the end side of the handpiece. FIG.
As is clear from FIG. 7, when the bending position coincides with the node, the driving voltage is minimized, and the driving voltage increases when the bending position is away from the node. Therefore, it is optimal to bend at the node.

When the vibration transmitting member (joint) 2 is further longer by half a wavelength of the ultrasonic vibration as shown in FIG. 2, there are two nodes in the vibration transmitting member (joint) 2. . In that case, either the second or third node may be bent. In other words, it is sufficient that the portion is a node and has a large cross-sectional area. Although the embodiment used in the description of the present invention relates to an ultrasonic crushing and aspirating apparatus for a surgical operation, the present invention can be similarly applied to an ultrasonic incision and coagulation apparatus for a surgical operation.

[0011]

According to the present invention, in the handpiece of a surgical ultrasonic treatment apparatus, the drive voltage of the handpiece can be reduced by improving the vibration transmission efficiency, the vibration stress at the bent portion is reduced, and the bending force is reduced. Since a failure such as a crack can be reduced by bending a portion having a large cross-sectional area that can sufficiently withstand stress, a handpiece with high safety and reliability can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram showing one embodiment of the present invention.

FIG. 2 is a diagram showing one embodiment of the present invention.

FIG. 3 is a view showing a conventional handpiece.

FIG. 4 is a diagram illustrating a change in drive voltage with respect to a bending position.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ultrasonic vibrator 2 Vibration transmission member (joint) 3 Vibration transmission member (chip) 4 Casing 5 Flange 6 Vibration element 7 Insulating plate 8 Electrode plate 9 Front metal block 10 Backing metal block 11 Vibrator fastening bolt 12 Suction Hole 13 Insulation material

Claims (1)

[Claims] Claims: 1. A living tissue is crushed and emulsified by ultrasonic vibration.
In the handpiece of a surgical ultrasonic treatment apparatus for aspiration removal or incision / coagulation, the second or subsequent node of the ultrasonic vibration counted from the handpiece distal end or the cross-sectional area near the node is the handpiece. A handpiece of an ultrasonic treatment apparatus for a surgical operation, wherein the handpiece has a cross-sectional area larger than a tip end of the piece and bends or curves the node or the vicinity of the node.