JPH11267129A - Hand piece of ultrasonic scalpel for surgical operation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To drastically reduce the driving voltage of a hand piece, and improve safety by a method wherein the hand piece of an ultrasonic scalpel for surgical operation, for a purpose wherein a biomedical tissue is spalled and emulsified by an ultrasonic vibration, and removed by drawing, is constituted in such a manner that a node part at a second location or after when being counted from the terminal end side, may be held. SOLUTION: This hand piece of an ultrasonic scalpel for surgical operation is constituted of an ultrasonic oscillator 1, a joint 2 and a chip 3 or the like, and the ultrasonic oscillator 1 is constituted of a vibration element, an electrode plate, an insulation plate, a front face metal block, a backing metal block or the like. For such a hand piece, a node part at a second location when being counted from the terminal end, is held and sealed by a casing 4. That is, the joint 2 which is connected to the ultrasonic oscillator 1, is supported by the casing 4 at a flange 5. By this method, a flange which is provided on the ultrasonic oscillator 1 is made unnecessary, and the quantity of the vibration elements is made freely changeable. Also, the thickness of the insulating plate in order to suppress a leakage current can be set larger, as well.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic scalpel handpiece having a function of crushing and emulsifying a living tissue by ultrasonic vibration and removing it by suction.

[0002]

2. Description of the Related Art As shown in FIG. 5, a handpiece of a surgical ultrasonic scalpel having a function of crushing, emulsifying and removing a living tissue by ultrasonic vibration, as shown in FIG. 3 and so on. As shown in FIG. 6, the ultrasonic vibrator 1 includes a vibrating element 7, an electrode plate 8,
Insulating plate 9, front metal block 10, backing metal block 1
1 and bolts 12 and the like. The vibrating elements 7 and the electrode plates 8 are alternately stacked, and they are sandwiched between insulating plates 9.
Further, a front metal block 10 and a backing metal block 11
And tightened with bolts 12. The insulating plate 9 includes the electrode plate 8 to which high frequency power is supplied and the front metal block 1.
It is provided to electrically insulate the 0 and backing metal blocks 11. The ultrasonic transducer 1 is provided with a flange 5 for holding the entire handpiece in the casing 4. The flange 5 is provided at a position serving as a node of the vibration distribution when the handpiece is driven at the resonance frequency. Thereby, the entire handpiece can be firmly held without obstructing the transmission of the ultrasonic vibration of the handpiece. Further, by holding the flange 5 with the casing 4, the region from the flange 5 to the end of the handpiece can be sealed, that is, the vibration element 7 can be installed in the sealed region. The vibrating element 7 can be protected from a harsh environment such as a high-pressure steam sterilization performed in the above-described manner. Such a method of holding a handpiece is disclosed in, for example, Japanese Patent Application Laid-Open No. 3-280945 and many other published patent publications.

[0003]

In recent years, in order to improve the usability of the handpiece, a handpiece having a special shape such as a bent or curved handpiece has been required. Such specially shaped handpieces generally tend to have a high drive voltage, which may result in safety issues such as increased patient leakage current. Therefore, it is necessary to reduce the handpiece drive voltage. As a method of reducing the handpiece driving voltage, there is a method of improving the vibration transmission efficiency, but there is a limit in securing a special shape and improving the vibration transmission efficiency. Therefore, it is necessary to take a method of increasing the number of vibrating elements 7 of the ultrasonic vibrator 1 as a method of reducing the driving voltage while securing the special shape.

A vibration element 7 is already disposed as far as possible from the flange 5 of the ultrasonic vibrator 1 to the end of the handpiece, and there is no more space for installing the vibration element 7 in this portion. If the thickness of the backing metal block 11 is reduced, more vibrating elements 7 can be installed. However, the tightening strength of the bolts 12 is reduced, which is not suitable for use as the ultrasonic vibrator 1. On the other hand, it is possible to install the vibrating element 7 on the front metal block 10 side, but since the wiring for supplying high-frequency power to the vibrating element 7 passes through the outer periphery of the flange 5, the outer diameter of the casing 4 Not only becomes large, but also the flange 5 cannot be held firmly. The above problem can be solved by forming a groove in the flange 5 and passing the wiring through the groove, but a separate sealing measure such as an O-ring is required to install the vibrating element 7 in a closed area. come.

The present invention has been made in view of the above-mentioned problem, and an object thereof is to secure an installation space for the vibrating element 7 in order to reduce the driving voltage of the ultrasonic vibrator 1, An object of the present invention is to provide a highly safe handpiece by holding the handpiece so as not to hinder the transmission of sound wave vibration.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a handpiece of a surgical ultrasonic scalpel for crushing and emulsifying a living tissue by ultrasonic vibration and removing it by suction, the second or later handpiece counted from the handpiece terminal side. A surgical ultrasonic scalpel handpiece, characterized in that it retains the nodal section.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments. FIG. 1 is a view showing one embodiment of the ultrasonic surgical handpiece of the present invention. In this figure, 1 is an ultrasonic transducer, 2 is a joint, 3 is a chip, 4 is a casing, and 5 is a flange for holding a handpiece. The vibration distribution when this handpiece is driven at the resonance frequency is also shown in FIG. The second node counted from the end of the handpiece is held and sealed by the casing 4. As a result, there is no need to install the flange 5 on the ultrasonic vibrator 1, and the number of the vibrating elements 7 can be freely increased or decreased. Further, the thickness of the insulating plate 9 can be increased in order to suppress the patient leakage current.

FIGS. 2 to 4 show another embodiment. As shown in FIG. 2, the ultrasonic transducer 1 and the joint 2 may be integrated. As shown in FIG. 3, the ultrasonic transducer 1 may be formed from the end of the handpiece to the flange 5, and the tip 3 from the flange 5 to the tip of the handpiece may be formed. Further, instead of holding by the flange 5 as shown in FIG. 4, the holding groove 6 installed at the node of the vibration distribution may be held by the casing 4. In the present embodiment, the electrostrictive ultrasonic vibrator has been described, but the present invention may be applied to a magnetostrictive ultrasonic vibrator. Further, for a handpiece having a long overall length, the third and subsequent nodes counted from the end of the handpiece may be held.

[0010]

According to the present invention, it is possible to increase the number of vibrating elements of an ultrasonic vibrator and to hold the handpiece without hindering ultrasonic vibration transmission in a surgical ultrasonic scalpel handpiece. The driving voltage of the handpiece can be greatly reduced, and a highly safe handpiece 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 (modification) of the present invention.

FIG. 3 is a diagram showing one embodiment (modification) of the present invention.

FIG. 4 is a diagram showing one embodiment (modification) of the present invention.

FIG. 5 is a diagram showing a conventional holding method.

FIG. 6 is a diagram showing a structure of an ultrasonic transducer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ultrasonic vibrator 2 Joint 3 Tip 4 Casing 5 Flange 6 Holding groove 7 Vibration element 8 Electrode plate 9 Insulating plate 10 Front metal block 11 Backing metal block 12 Bolt

Claims (1)

[Claims] 1. A handpiece of a surgical ultrasonic scalpel for crushing and emulsifying a living tissue by ultrasonic vibration and removing it by suction, the second and subsequent nodes counted from the end of the handpiece are held. Characteristic ultrasonic surgical scalpel handpiece.