JPH06142112A - Ultrasonic treating device - Google Patents

Abstract

PURPOSE:To provide the ultrasonic treating device which enhances the efficiency by suppressing unnecessary heating to the minimum and also, has no danger and has high safety, although the device consists of a simple constitution. CONSTITUTION:A Langevin type ultrasonic vibrator 1 is constituted by inserting and holding an oscillating part 6 formed by superposing and laminating alternately a polarized piezoelectric element (PZT) 4 and an electrode 5, between a front metallic member 2 and a backing metallic member 3, allowing the rear end side part of a bolt 7 whose tip is fixed to the front metallic member 2 to pass through the backing metallic member 3 from the oscillating part 6 and screwing the backing metallic member 3 to its outside periphery.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic treatment apparatus for ultrasonically crushing or emulsifying tumor tissue, stones, hematomas and the like.

[0002]

2. Description of the Related Art Ultrasonic treatment devices of this type, especially for surgical use, are disclosed, for example, in Japanese Patent Laid-Open No. 60-116347 and Japanese Utility Model Laid-Open No. 61-145511.
It is known from the official gazette. According to this, the Langevin type ultrasonic transducer 1 is built in a holding case (not shown) of the handpiece.
(B), the front metal member 2 and the backing metal member 3
An oscillating portion 6 in which polarized piezoelectric elements (PZT) 4 and electrodes 5 are alternately stacked is sandwiched between the two, and a rear end side portion of a bolt 7 having a tip fixed to the front metal member 2 is lined from the oscillating portion 6 with metal. While penetrating the member 3 and projecting to the rear of the backing metal member 3, the nut 8 is provided on the outer periphery of the protruding portion of the bolt 7.
The nut 8 is screwed in and the nut 8 is screwed in, so that the oscillation portion 6 is strongly tightened between the front metal member 2 and the backing metal member 3.

On the other hand, the bolt 7 is formed with a suction passage 9 formed over the front metal member 2, and the protruding portion at the rear end thereof serves as a mouthpiece portion 10 for connecting to a suction tube (not shown). Then, the ultrasonic vibration generated in the laminated portion 6 is transmitted to a treatment member (not shown) with its amplitude enlarged by the front metal member 2 having a tapered front portion.

[0004]

By the way, in the Langevin type ultrasonic transducer 1 of this kind, conventionally, mainly,
Although attention was focused on an improvement for efficiently transmitting ultrasonic waves to the treatment member through the front metal member 2, there were the following problems. That is, in the ultrasonic transducer 1, the rear end side protruding portion of the bolt 7 is considerably thin as shown in FIG. 1B because of the suction pipe line system connected to the bolt 7. Due to this narrowing step, the amplitude a of ultrasonic vibration is increased a, and vibration friction heat is generated at the seal and the fixed portion at this portion, which damages the O-ring and the like at that portion and deteriorates the sealing performance. There was a problem of destroying the watertightness of the handpiece. Further, if the operator touches the vicinity of the heat generating portion, there is a risk of causing burns. Furthermore, there is a problem that the efficiency of the ultrasonic transducer is lowered due to the heat generation.

The present invention has been made in view of the above-mentioned problems, and its object is to suppress unnecessary heat generation as much as possible to improve efficiency and to prevent damage to other members even though the structure is simple. An object of the present invention is to provide a highly safe ultrasonic treatment device which is not given and is not dangerous.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a laminated portion in which a piezoelectric element and an electrode are superposed is sandwiched between a front member and a backing member, and the front member and the backing member are fastened with bolts to form the laminated body. In an ultrasonic treatment device having an ultrasonic transducer for compressing and fixing a portion, a rear end of the tightening bolt is flush with a rear end surface of the backing member, and
When there is a nut in addition to the backing member, the nut and the backing member are arranged so as to be located on the front member side from the same surface as the rear end surface of the rearmost member.

FIG. 1A shows a conceptual configuration of an ultrasonic transducer according to the present invention, as compared with the conventional one shown in FIG. 1B. This Langevin type ultrasonic transducer 1
An oscillating portion 6 in which polarized piezoelectric elements (PZT) 4 and electrodes 5 are alternately laminated is sandwiched between the front metal member 2 and the backing metal member 3, and the front end of the bolt 7 is fixed to the front metal member 2. The end side portion is penetrated from the oscillation part 6 to the backing metal member 3, and the backing metal member 3 is screwed onto the outer periphery thereof.

A rear end of the tightening bolt 7 is flush with a rear end surface of the backing metal member 3. Therefore, the ultrasonic vibration is not amplified at the rear end of the tightening bolt 7 (see the graph of vibration displacement in FIG. 1A).

[0009]

FIG. 2A shows an embodiment of a surgical operating apparatus having a Langevin type ultrasonic transducer according to the present invention built therein. The Langevin type ultrasonic transducer 1
The basic configuration of is that an oscillating portion 6 formed by alternately stacking polarized piezoelectric elements (PZT) 4 and electrodes 5 is sandwiched between a front metal member 2 and a back metal member 3, and the front metal member 2 and the back metal member 3 are lined together. The oscillating portion 6 is pressed and sandwiched by tightening the metal member 3 with the metal bolt 7. The tip portion of the bolt 7 is screwed into the front metal member 2 to be fixed, and the rear end portion is fixed to the oscillating portion 6. To the backing metal member 3. The backing metal member 3 is screwed onto the outer periphery of the rear end portion of the bolt 7. That is, the backing metal member 3 also serves as a nut that is screwed into the bolt 7. Further, the tightening bolt 7 is vibratically integrated with the backing metal member 3.

The rear end of the tightening bolt 7 does not project rearward from the rear end surface 3a of the backing metal member 3,
After that, it is flush with the end face 3a. Therefore, since a relatively thin step is not formed on the rear end side of the tightening bolt 7, the ultrasonic vibration is not amplified near the rear end of the tightening bolt 7. Further, since the backing metal member 3 has the same diameter as the oscillating portion 6, this also prevents amplification of ultrasonic vibration (see the graph of FIG. 1A).

In this case, the backing metal member 3 is the bolt 7
Although the nut to be screwed with is also used, the nut may be separately provided. In this case, it is desirable that the nut has a diameter as large as possible, for example, about the diameter of the backing metal member 3.

The front portion of the front metal member 2 is formed as a tapered horn portion 11. A vibration transmission member 12 made of a thin metal pipe for performing high frequency treatment is connected to the tip of the horn portion 11 by a screw portion 13. The vibration transmission member 12 can be attached and detached and replaced with another one. Further, a suction passage 9 is formed in the Langevin type ultrasonic transducer 1 from the vibration transmission member 12 to the front metal member 2 and the tightening bolt 7 along the central axis thereof.

Further, the front metal member 2 is formed with a flange portion 16 which forms the maximum outer diameter portion thereof. And
The Langevin type ultrasonic transducer 1 constitutes a surgical handpiece 18 such as an ultrasonic scalpel by fixing and assembling the flange portion 16 to the handpiece cover 17 using a fixing ring 19.

On the rear end wall of the handpiece cover 17, there is screwed a metal suction mouthpiece 21 that penetrates the handpiece cover 17 in an airtight manner. An outer end portion of the suction mouthpiece 21 forms a mouthpiece portion 22 for connecting a suction tube described later. Further, a circular flange 23 is formed at the inner end of the suction mouthpiece 21, and the circular flange 23 is close to and is opposed to the rear end surface 3a of the backing metal member 3 at the coaxial position.

A sealing O-ring 24 is inserted between the rear end surface 3a of the backing metal member 3 and the circular flange 23 of the suction mouthpiece 21. The backing metal member 3 and the suction cap 21 are not in direct contact with each other, but are indirectly connected via their elastic O-rings 24.
The suctioned material is sealed so as not to leak into the handpiece cover 17 from between the two. This allows the suction base 2
1 is connected to the suction passage 9 for communication.

A power cord 25 for supplying a driving high frequency current to each electrode 5 of the oscillator 6 is attached to the rear end wall of the handpiece cover 17. A sheath described later is detachably attached to the front end of the handpiece cover 17, and the sheath includes the vibration transmitting member 12 excluding the treatment distal end.
The outer circumference of the can be covered. And
Water can be supplied to the sheath directly or through the handpiece cover 17 from a water supply tube described later.

FIG. 2B shows an example of the handpiece 18 in which the suction mouthpiece 21 is modified. The suction base 21 is formed of a vibration absorbing material such as resin or hard rubber, and a screw portion 26 is provided on the outer periphery of the inner end side portion thereof, and the screw portion 26 is screwed into a screw hole formed in the backing metal member 3. It is designed to connect. The suction cap 21 is attached and fixed by penetrating the rear end wall of the handpiece cover 17 in an airtight manner. Other configurations are the same as those of the handpiece 18 described above. According to this, since the backing metal member 3 has the same diameter as the oscillating portion 6 and the rear end of the tightening bolt 7 does not protrude from the rear end face 3a, amplification of ultrasonic vibration does not occur at the rear position. .

FIG. 3 shows an example of the system configuration of this surgical operating apparatus. In the figure, reference numeral 30 denotes a drive device, which drives the surgical handpiece 18 and also drives and controls the water jet knife 31. The drive device 30 has a connector receiver 33 for connecting a connector 32 provided at the end of the power cord 25 extending from the surgical handpiece 18. Further, the drive device 30
Has a water supply pump 34, and a water supply bottle 36 is connected to an inflow end of the water supply pump 34 via a water supply tube 35. A water supply tube 37 for supplying water to the surgical handpiece 18 or the water jet knife 31 is connected to the outflow end of the water supply pump 34. As the water pump 34, for example, a roller pump is used.

The drive unit 30 is installed on a moving carriage 38. The moving carriage 38 is provided with a suction pump 39 and a suction tank 40. The suction pump 39 is connected to one end of the suction tank 40 via a suction tube 41. The other end of the suction tank 40 is connected via a suction tube 42 to the suction passages 9 and 49 of the surgical handpiece 18 or the water jet knife 31.

Further, the drive unit 30 has an operation panel 43.
And a foot switch 44 is connected. The foot switch 44 operates to turn on / off the ultrasonic oscillation, water supply, and suction of the surgical handpiece 18, or the water supply and suction of the water jet knife 31. The water piece 4 of the water jet female 31 has a water passage 4 communicating with a tip nozzle 46 of the hand piece 45.
7 and a suction passage 49 communicating with the tip suction port 48. The suction passage 49 communicating with the tip suction port 48 sucks the fragments of the biological tissue crushed by the jet flow ejected from the tip nozzle 46 or the mixed solution of the blood and the liquid sent. A switch 50 that opens and closes the water supply passage 47 may be provided to control the jet flow ejected from the tip nozzle 46. According to this system, the versatility of the device is increased, and the indication of surgery can be easily expanded.

FIG. 4 schematically illustrates the suction line system associated with the surgical handpiece 18. A preliminary suction bottle 51 is inserted in the middle of the suction tube 41 between the suction pump 39 and the suction tank 40. Suction tank 4
A float switch 52 and a liquid level switch 53 are provided at 0 to detect that the suctioned substance has accumulated more than its capacity, and warn against this or stop the operation of the device. The pre-suction bottle 51 stores things that could not be removed by the suction tank 40,
Do not let it get into the suction pump 39.

On the other hand, the suction tube 42 connected to the suction passages 9 and 49 of the surgical handpiece 18 or the water jet knife 31 has a distal end portion 42a on the surgical hand piece 18 or the water jet knife 31 side. The diameter of the rear end side portion 42b on the suction pump 39 side is increased. A flow path closing device 55 is provided near the rear end of the front end portion 42a. The flow path closing device 55 is a pinch type that closes the flow path by crushing the suction tube 42. The operation of the flow path closing device 55 is performed by the drive device 30.
Controlled by.

As described above, the suction tube 42 is formed by a relatively thick tube having a large suction amount from the flow path closing device 55 to the suction tank 40, and the part from the flow path closing device 55 to the end of the handpiece enhances the operability of the handpiece. It is formed by a flexible thin tube. Therefore, the operability of the surgical handpiece 18 or the water jet knife 31 is good, and the suction amount does not decrease. Therefore, even if a relatively thin flexible tube that improves operability is used, the suction amount of the crushed tissue or the like is not reduced, and a small suction pump 39 can be used.
Needless to say, it is desirable that the diameter of the suction flow passage is not limited to the suction tank 40, and it is preferable to include the suction pump 39. 56 is a silencer.

In the case of such a structure, it is particularly suitable when the surgical handpiece 18 having the following structure is used. That is, the surgical handpiece 18
Although not specifically shown, the sheath 57 that covers the outer circumference of the vibration transmitting member 12 is composed of an outer sheath and an inner sheath, and forms a water supply path between the inner and outer sheaths to supply water from the front end side opening portion. Further, the suction is performed through the gap between the outer periphery of the vibration transmission member 12 and the inner sheath in addition to the suction passage 9. The suction performed through the gap between the outer periphery of the vibration transmitting member 12 and the inner sheath is formed in the middle of the vibration transmitting member 12 or in the hand piece 18 and is sucked through the leak through hole communicating with the suction passage 9. Has become. Therefore, even if the tip of the vibration transmitting member 12 is pressed against the tissue or the like, the suction amount can be secured. The cooling of the vibration transmission member 12 does not become insufficient. Further, in this type of handpiece 18, since the suction amount can be secured by the configuration of the suction system path described above, a synergistic effect can be obtained.

[0025]

As described above, according to the present invention, a laminated portion in which a piezoelectric element and an electrode are superposed is sandwiched between a front member and a backing member, and the front member and the backing member are fastened with bolts to form the laminated portion. In the ultrasonic treatment device having an ultrasonic transducer for compressing and fixing the same, the tightening bolt has a rear end that is flush with the rear end surface of the backing member, and if there is a nut other than the backing member, the nut. Since the backing member is disposed so as to be located on the front member side from the same surface as the rear end surface of the rearmost member, ultrasonic vibration is not amplified near the rear end of the tightening bolt. Therefore, it is possible to provide a highly safe ultrasonic treatment device that has a simple structure, suppresses unnecessary heat generation as much as possible, improves efficiency, does not damage other members, and has no risk. it can.

[Brief description of drawings]

1A is an explanatory diagram showing a conceptual configuration of an ultrasonic transducer according to the present invention, and FIG. 1B is an explanatory diagram showing a conceptual configuration of a conventional ultrasonic transducer.

2A is a cross-sectional view of a surgical handpiece having a Langevin type ultrasonic transducer according to an embodiment of the present invention built therein, and FIG. 2B is a Langevin according to another embodiment of the present invention. FIG. 3 is a cross-sectional view of a surgical handpiece having a built-in ultrasonic transducer.

FIG. 3 is an explanatory diagram showing an example of a system configuration of a surgical operating apparatus.

FIG. 4 is an explanatory view schematically showing a suction line system related to the surgical handpiece.

[Explanation of symbols]

1 ... Langevin type ultrasonic transducer, 2 ... front metal member,
3 ... Backing metal member, 4 ... Piezoelectric element, 5 ... Electrode, 6 ... Oscillating part, 7 ... Bolt, 3a ... Rear end face.

Claims (1)

[Claims] 1. An ultrasonic transducer for sandwiching a laminated portion in which a piezoelectric element and an electrode are superposed on each other between a front member and a backing member, and tightening the front member and the backing member with bolts to compress and fix the laminated portion. In the ultrasonic treatment apparatus having, the tightening bolt has a rear end flush with the rear end surface of the backing member, and when there is a nut in addition to the backing member, the nut and the backing member are the rearmost side. The ultrasonic treatment device is disposed so as to be located on the front member side from the same surface as the rear end surface of the member.