JPH09266914A - Ultrasonic hand piece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ultrasonic hand piece which can effectively control vibration of the ultrasonic horn part for a long time so that it will not be transmitted to the hand piece main body and which is easy to operate and waterproof. SOLUTION: This device has an ultrasonic horn part 6 with an ultrasonic tool part 6Bk at the top, and the hand piece main body 8. An ultrasonic vibrator 4 to vibrate the horn part 6 is installed on the hand piece main body 8, and the ultrasonic horn part 6 is held by the land piece main body 8 by way of a flange part 6a. A front case 10 whose cross section is U-shaped with a through hole at the center is detachably mounted at the top of the hand piece main body 8. A gap 11 is formed between the front case 10 and the top surface of the hand piece main body 8 to keep cooling liquid tentatively. A ringed protrusion 8A is formed on the inner diameter side of the hand piece main body 8, and a first O-ring 16 is attached between the inner surface of the ringed protrusion 8A and the ultrasonic horn part 6 for waterproofing the side of the ultrasonic vibrator 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic handpiece, and particularly to an ultrasonic handpiece that effectively functions as one of various surgical scalpels and also functions as a device for processing plastic products and the like. Regarding the handpiece.

[0002]

2. Description of the Related Art In the medical field, ultrasonic handpieces have been used relatively frequently as one of various surgical scalpels. In the industrial field, various ultrasonic handpieces have been widely used for cutting plastics.

A conventional example of this ultrasonic handpiece is shown in FIGS. Of these, FIG. 7 shows the overall configuration of an ultrasonic processing apparatus including an ultrasonic handpiece. In FIG. 7, reference numeral 50 indicates an ultrasonic handpiece for ultrasonic processing, and reference numeral 52 indicates an ultrasonic oscillator. Further, reference numeral 54 is a cooling cleaning liquid (irrigation liquid).
Is a plastic transparent bag containing physiological saline, and reference numeral 54A is a cooling liquid introduction hose for feeding the cooling liquid in the transparent bag 54 into the ultrasonic handpiece 50.
The cooling liquid introducing hose 54A is provided between the transparent bag 54 and the ultrasonic handpiece 50 via a roller-type rotary water injection pump 53.

Further, in FIG. 7, the above-mentioned ultrasonic oscillator 52 is provided with a first power switch 52A for turning on / off the operation thereof and a second power switch for allowing an operator to operate with a foot. It is equipped with a certain foot switch 52B. Reference numeral 55 is a transparent bag 54 for the cooling liquid.
Shows a stand for hanging.

The ultrasonic handpiece 50, as shown in FIG. 8, is an ultrasonic transducer 50 that outputs ultrasonic waves of a predetermined frequency.
A, an ultrasonic horn unit 50B coaxially integrated with the ultrasonic vibrator 50A and receiving and converging the ultrasonic waves output from the ultrasonic vibrator 50A, and the ultrasonic vibrator 50A are housed. And a handpiece body 50C equipped with an ultrasonic horn portion 50B protruding therefrom, and an ultrasonic horn portion 50.
An ultrasonic tool (tool section) 50D coaxially equipped with the ultrasonic horn section 50B is provided at the tip of B.

The ultrasonic horn portion 50B has a thin plate-shaped annular collar portion 50Ba around the ultrasonic transducer 50A side, and the annular collar portion 50Ba is used for a screw member 50Ca and a seal member 50Ce and for sealing. The ultrasonic horn unit 50 is sandwiched by the O-ring 50Cf.
B is connected to the handpiece body 50C.

The ultrasonic horn portion 50B is equipped with a cooling liquid jetting means 56 for jetting a predetermined cooling liquid toward the work piece. Reference numeral 56A indicates a cooling liquid introduction pipe, and reference numeral 5
Reference numeral 6B denotes a cooling liquid introducing nipple provided in the ultrasonic horn portion 50B for discharging the cooling liquid from the tool 50D portion. As a result, heat invasion (heat damage) of the processed portion due to overheating that is likely to occur along with ultrasonic vibration of the tool 50D
The occurrence of is effectively suppressed in advance.

Further, in this conventional example, as shown in FIG. 8, the annular collar portion 50Ba is sandwiched by the seal members 50Ce and O-rings 50Cf arranged on both sides thereof,
As a result, the ultrasonic horn portion 50B is connected to the handpiece body 50C while maintaining a state of being floated from the handpiece body 50C. Therefore, in this conventional example, the vibration of the ultrasonic horn portion 50B is absorbed by the seal member 50Ce and the O-ring 50Cf, and the operability is excellent in this respect.

[0009]

However, in the above-mentioned conventional example, as described above, the annular flange portion 50Ba is pressed in the direction along the central axis through the seal member 50Ce and the O-ring 50Cf. Since the ultrasonic horn unit 50B is connected to the handpiece body 50C while sandwiching the ultrasonic horn unit 50B while keeping the ultrasonic horn unit 50B floating from the handpiece body 50C, vibration from the lateral direction or The ultrasonic horn 50B is displaced depending on the pressing force.

For this reason, there is an inconvenience that the machining position of the tip end portion of the tool 50D is not stable and the operability is poor, and at the same time, the annular collar portion 50Ba abuts the inner wall of the handpiece body 50C, and ultrasonic vibrations occur. Since the ultrasonic handpiece 50 is transmitted to the 50C side and the entire ultrasonic handpiece 50 vibrates minutely, since there is no other vibration absorbing means, the microvibration is transmitted to the operator's hand, which is inconvenient.

Further, in the above-mentioned conventional example, since the cooling liquid introducing portion of the cooling liquid injection means 56 is provided so as to project from the handpiece main body 50C, the visibility of the processing portion is obstructed during actual use. There was an inconvenience.

[0012]

It is an object of the present invention to improve the disadvantages of the conventional example, and particularly to effectively suppress the vibration of the ultrasonic horn portion from propagating to the body of the handpiece for a long period of time with a simple structure, and to improve operability and It is an object of the present invention to provide an ultrasonic handpiece having good waterproofness.

[0013]

In order to achieve the above object, in the invention according to claim 1, an ultrasonic oscillator for outputting an ultrasonic wave of a predetermined frequency and an ultrasonic oscillator are integrally provided coaxially with the ultrasonic oscillator. Through an ultrasonic horn unit that is connected and converges the ultrasonic waves output from the ultrasonic vibrator, and a flange unit that is provided inside the ultrasonic horn unit and that is provided inside the ultrasonic vibrator unit. It has a tubular handpiece body for holding the ultrasonic horn portion, and an ultrasonic tool portion is provided at the tip of the ultrasonic horn portion.

In addition, a front case having a U-shaped cross section having a through hole for an ultrasonic horn in the center is detachably attached to the tip of the handpiece main body, and the front case and the handpiece are attached. A gap is provided between the body and the tip of the body to temporarily hold the cooling liquid. A liquid introduction path leading to the void is provided in the side wall of the handpiece body, and a means for sending the cooling liquid in the front case toward the tip of the ultrasonic horn is communicated with the void.

Further, an annular protrusion is provided at a portion located on the inner diameter side of the ultrasonic horn portion and between the collar portion and the ultrasonic transducer, and the inner peripheral surface of the annular protrusion is described above. The first O for waterproofing between the outer peripheral surface of the ultrasonic horn
It is equipped with a ring.

Therefore, according to the first aspect of the present invention,
First, the ultrasonic waves generated by the ultrasonic transducer 4 are converged by the ultrasonic horn portion 6 and the tool portion (ultrasonic tool portion) at the tip end portion.
Drive 6 Bk. In this case, in FIG. 1, since the first horn portion 6A and the second horn portion 6B constitute a relatively long horn portion, it can be relatively well applied to a deep portion in a narrow place.

Next, the tool portion is brought close to the processing portion and the water injection pump is turned on to inject the cooling cleaning liquid (irrigation liquid) toward the operation portion. In this case, since the liquid introduction path 13 for the cooling cleaning liquid is provided in the side wall portion of the handpiece body 8, the structure of the tip portion of the ultrasonic handpiece is simplified, and the visual field of the operator is less obstructed during use.
In this respect, operability can be improved.

Further, by the action of the first O-ring, the ultrasonic transducer 4 side is effectively waterproofed from the gap side on the tip side of the handpiece body 8, and the lateral displacement of the ultrasonic horn section 6 is surely achieved. In addition, the vibration component of the ultrasonic horn propagating to the handpiece body 8 side is effectively absorbed and the operability is also improved.

According to a second aspect of the present invention, in the above-mentioned first aspect of the invention, an annular pressing member for sandwiching the collar portion of the ultrasonic horn together with the annular protruding portion is provided on the tip side of the handpiece body. Equipped with screwing. A second O-ring for waterproofing is provided between the inner peripheral surface of the annular pressing member and the ultrasonic horn portion, and the outer peripheral surface of the annular pressing member and the inner peripheral surface of the handpiece body described above are connected. It is equipped with a third O-ring for waterproofing.

Therefore, according to the second aspect of the present invention,
An ultrasonic horn that functions in the same manner as the above-described invention of claim 1 and that the second to third O-rings function to prevent lateral displacement of the ultrasonic horn portion 6 and propagate to the handpiece body 8 side. The vibration absorbing property of the vibration component is further enhanced.

According to the third aspect of the invention, there is adopted a structure in which the above-mentioned concave groove for holding the first O-ring is provided in the ultrasonic horn portion.

Therefore, even in the invention described in claim 3,
It is possible to obtain a function equivalent to that of the invention described in claim 1 or 2.

[0023]

DETAILED DESCRIPTION OF THE INVENTION A first embodiment of the present invention will be described below with reference to FIGS. First, in FIG. 1, reference numeral 2 indicates an ultrasonic handpiece. This ultrasonic handpiece 2 is an ultrasonic transducer 4 that outputs ultrasonic waves of a predetermined frequency, and an ultrasonic transducer that is integrally connected coaxially with the ultrasonic transducer 4 and that is output from the ultrasonic transducer 4. An ultrasonic horn unit 6 for inputting and converging a sound wave is provided. Reference numeral 8 indicates a tubular handpiece body. The handpiece main body 8 has the ultrasonic transducer 4 and a part of the ultrasonic horn portion 6 described above disposed therein, and the ultrasonic horn via the collar portion 6 a provided on the ultrasonic horn portion 6. The part 6 and the ultrasonic transducer 4 are held.

The ultrasonic horn section 6 is provided with a first horn section 6A having the above-mentioned collar section 6a in the center thereof, and is screwed on the same axis as the first horn section 6A and extended toward the outside. It is constituted by a second horn portion 6B having a predetermined length and having a tool portion (ultrasonic tool portion) 6Bk provided at its tip portion. The second horn portion 6B is equipped with a relatively long one in this embodiment so that it can be easily processed even in a narrow space.

As shown in FIGS. 1 and 2, a front case 10 having a U-shaped cross section (cap shape) is provided at the tip of the handpiece body 8 (on the side of the second horn 6B). The front case 10 is provided with a through hole 10a for the ultrasonic horn section 6 in the central portion and is detachably attached to the tip portion of the handpiece body 8 described above. A sealing groove 10E is formed in the through hole 10a. Reference numeral 10F indicates an O-ring for sealing provided in the groove 10E for sealing.

Specifically, the inner diameter of the front case 10 on the opening side (left side in FIG. 1) is formed slightly larger than the outer diameter of the tip of the handpiece body 8 described above, and is slidably fitted. Have been combined. Further, as shown in FIGS. 1 and 2, the inner diameter portion of the front case 10 on the opening side is O
The groove 10b for storing the ring is formed, and the groove 10b is formed.
An O-ring 12 for sealing the fitting surface between the handpiece body 8 and the front case 10 is housed inside. In this case, the O-ring 1 is also attached to the handpiece body 8 side.
The concave groove 12a for 2 is formed shallowly. As a result, shearing stress and frictional force act appropriately on the O-ring 12, and the front case 10 is prevented from coming off the handpiece body 8.

On the other hand, in order to separate the front case 10 from the handpiece body 8, an external force slightly larger than the frictional force of the O-ring 12 described above is applied.
And the front case 10 is gradually pulled out. As a result, the O-ring 12 is deformed and separated from the shallow groove 12a on the handpiece body 8 side. Therefore, the front case 10 can be relatively easily detached from the handpiece body 8 as needed.
This state is shown in FIG.

Here, the front case 10 having a U-shaped cross section.
Is the handpiece body 8 via the O-ring 12 for sealing.
Since it is attached to the O-ring 12 as shown in FIG.
It is possible to rotate the front case 10 along the outer periphery of the.

Front case 10 and handpiece body 8
A gap portion 11 for temporarily holding the cooling liquid is provided between the gap surface 11 and the tip surface of the. Further, the liquid introduction passage 13 communicating with the void portion 11 is formed in the side wall portion of the handpiece body 8 described above. Here, the liquid introduction path 13 may be equipped with the intermediate portion thereof exposed to the inner diameter side of the handpiece body 8. Further, the front case 10 is provided with a liquid injection hole 10A that faces the tip of the ultrasonic horn section 6. As shown in FIGS. 1 and 2, the liquid injection hole 10A is provided at a position separated from the central axis portion by a predetermined distance and in parallel with the central axis of the ultrasonic horn section 6.

For this reason, the cooling liquid injected from the liquid injection hole 10A can be continuously and directly poured into the processed portion through the air by appropriately adjusting the pressure thereof, whereby the processing portion Cooling can be done quickly. A rear end cap 14 for holding and guiding a signal input cable for inputting a transducer drive signal is provided at the left end (rear end) in FIG. 1 of the cylindrical handpiece body 8. Further, a liquid introduction pipe 15 for introducing a predetermined cooling cleaning liquid (irrigation liquid) from the outside into the liquid introduction passage 13 is connected to the rear end portion of the handpiece body 8.

1 to 2 of the handpiece main body 8
At the inner diameter side of the right end portion (tip portion) of the
A is provided. In addition, the annular protrusion 8A shown in FIG.
On the right side of, a tubular and relatively thick annular pressing member 8B corresponding to the annular protruding portion 8A is screwed to the inner diameter side of the handpiece body 8. Then, the collar portion 6a provided on the ultrasonic horn portion 6 is clamped by the annular protruding portion 8A and the annular pressing member 8B, so that the ultrasonic horn portion 6 is held by the handpiece body 8. It has become. Reference numeral 8Bc indicates a locking hole for urging the annular pressing member 8B with a rotational force for attachment / detachment.
Reference numeral 8D indicates a waterproof annular spacer made of a vibration absorbing member provided on the flange portion 6a side of the annular pressing member 8B.
The annular spacer 8D enhances the vibration absorbing property and waterproof property of the collar portion 6a.

Here, in the first horn portion 6A of the ultrasonic horn portion 6 facing the inner peripheral surface of the annular protruding portion 8A in the handpiece body 8 described above, the concave groove 6 for accommodating the O-ring is formed.
Aa is formed, and a first O-ring 16 for sealing the inside of the handpiece body 8 is accommodated in the groove 6Aa. Other configurations are the same as those of the above-described conventional example.

Next, the function and effect of the above embodiment will be described. First, when the rotary water injection pump for the cooling cleaning liquid (irrigation liquid) is turned off and the entire apparatus is set to the operating state, the ultrasonic transducer 4 operates and the generated ultrasonic wave is generated by the ultrasonic horn unit 6. 1 horn section 6A, 2nd horn section 6B
Then, the tool portion (ultrasonic tool portion) 6Bk at the tip of the second horn portion 6B is driven.

In this case, in FIG. 1, since the first horn portion 6A and the second horn portion 6B constitute a relatively long horn portion, it can be applied to a deep portion in a narrow place relatively well. It has become. Therefore, this embodiment is suitable for use in, for example, surgical (orthopedic) surgery. For example, it is suitable for cutting or removing the bone cement that adheres the bone equipped to the hip joint and the artificial joint in the replacement surgery of the artificial joint.

Next, the tool portion 6Bk is brought close to the processing portion, and at the same time, the rotary water injection pump is turned on to inject the cooling cleaning liquid (irrigation liquid) toward the operation portion. In this case, depending on the position and direction of the surgical site, as shown in FIG. 4, the front case 10 is rotated to set the liquid injection hole 10A at the optimum position. This FIG. 4 is a practical example. FIG. 4 is an example of the hip joint stem S embedded for the hip joint in the above-described replacement operation of the artificial joint K of the thigh. In this case, the front case 10 can be rotated to accurately and easily guide the cooling cleaning liquid toward the operation site (shaded area) C.

As described above, according to the above-described embodiment, since the front case 10 can be reciprocally rotated, the setting position of the liquid injection hole 10A can be freely changed, and the cooling cleaning liquid (irrigation liquid) can be supplied. It has become possible to guide the operator to the desired location. Further, since the front case 10 can be easily attached / detached, if inconvenience such as clogging of the liquid ejection hole 10A occurs during use, replacement of the front case 10 can immediately deal with clogging of the hole. it can.

Further, since the cooling cleaning liquid is poured into the processing portion directly from the outside of the ultrasonic horn 6, the tool portion (ultrasonic tool portion) 6Bk and the second horn portion 6B are used.
Since the liquid introduction passage 13 is provided in the side wall portion of the handpiece body 8, the structure of the tip portion of the ultrasonic handpiece is simplified, and the obstruction of the operator's view is reduced during use. It is possible to improve operability.

Further, the first O-ring 16 is provided on the outer peripheral surface of the first horn portion 6A of the ultrasonic horn portion 6 facing the inner peripheral surface of the annular protruding portion 8A in the handpiece body 8. Therefore, the lateral displacement of the ultrasonic horn portion 6 can be effectively prevented, and at the same time, the water resistance and the vibration absorption property in this portion can be effectively and continuously maintained.

Next, a second embodiment will be described with reference to FIG. The second embodiment shown in FIG. 5 is characterized in that an O-ring is provided on each of the inner peripheral surface and the outer peripheral surface of the annular pressing member 8B instead of the annular spacer 8D disclosed in FIGS. 1 and 2 described above. Is equipped with.

That is, the inner peripheral surface and the outer peripheral surface of the above-mentioned annular pressing member 8B are equipped with the second O-ring 17 and the third O-ring 18, respectively. Of these, the second O-ring 17 is housed in the O-ring housing groove 6Ba provided in the second horn portion 6B of the ultrasonic horn 6.
Further, the third O-ring 18 is housed in the O-ring housing groove 6Ba provided on the outer diameter side of the annular pressing member 8B. Other configurations are the same as those of the first embodiment shown in FIGS. 1 to 4 described above.

In this way as well, the same function as that of the second embodiment shown in FIG. 5 described above can be obtained, and the second to third O-rings 17 and 18 cause the annular pressing member 8B to move. The sealing property and the vibration absorbing property are enhanced, and at the same time, the lateral displacement operation of the ultrasonic horn 6 can be more effectively prevented.

Next, a third embodiment will be described with reference to FIG. The third embodiment shown in FIG. 6 is the same as the second embodiment shown in FIG.
And the first and second O-rings 16 to 17 are removed.
Each of the concave grooves 6Aa and 6Ba for accommodating the above is provided in a member constituting the surface on the opposite side to the case of FIG. 5 described above.

That is, the first O-ring 16 is housed in the O-ring housing groove 6Aa provided on the inner peripheral surface of 8A. The second O-ring 17 is provided with a groove 6Ba for accommodating the O-ring, which is provided on the inner peripheral surface of the annular pressing member 8B.
Is housed inside. Other configurations are the same as those shown in FIG.
This is the same as the embodiment.

Even in this case, it is possible to obtain substantially the same operational effects as those of the second embodiment shown in FIG.

[0045]

Since the present invention is constructed and functions as described above, according to this, since the front case is detachably equipped, the maintainability is improved, and the liquid of the cooling cleaning liquid for pouring water into the processing portion is improved. Since the introduction path is provided in the side wall portion of the handpiece body, the structure of the tip portion is simplified, and the visual field of the operator is less obstructed during use, and operability can be improved in this respect. Further, since the O-ring is equipped as described above, the lateral displacement of the ultrasonic horn can be effectively prevented by the action of the O-ring, and at the same time, the ultrasonic wave can be prevented from moving toward the ultrasonic transducer side and the handpiece body. It is possible to provide an unprecedented excellent ultrasonic handpiece that can effectively and continuously maintain the vibration absorbing function of absorbing a part of the vibration that propagates.

[Brief description of drawings]

FIG. 1 is a partially omitted cross-sectional view showing a first embodiment of an ultrasonic handpiece according to the present invention.

FIG. 2 is a detailed partial cross-sectional view showing a mounting portion of an ultrasonic horn portion of the ultrasonic handpiece disclosed in FIG.

3A and 3B are views showing a function of a front case of the ultrasonic handpiece disclosed in FIG. 1, FIG. 3A is an explanatory view showing a rotating operation of the front case, and FIG. It is explanatory drawing which shows operation.

FIG. 4 is an explanatory diagram showing a usage example of the ultrasonic handpiece disclosed in FIG. 1.

FIG. 5 is a partially omitted partial cross-sectional view showing an ultrasonic handpiece according to a second embodiment of the present invention.

FIG. 6 is a partially omitted partial cross-sectional view showing an ultrasonic handpiece according to a third embodiment of the present invention.

FIG. 7 is an explanatory diagram showing an entire ultrasonic machining system including an ultrasonic handpiece in a conventional example.

FIG. 8 is an explanatory diagram showing an example of the ultrasonic handpiece disclosed in FIG. 7.

[Explanation of symbols]

 2 Ultrasonic handpiece 4 Ultrasonic transducer 6 Ultrasonic horn part 6a Collar part 6Aa Recessed groove 6Bk Ultrasonic tool part (tool part) 8 Handpiece body 8A Annular protruding part 8B Annular pressing member 10 Front case 11 Void part 13 Liquid Introductory path 16 First O-ring 17 Second O-ring 18 Third O-ring

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Naomi Takekawa 8-33-8 Takashimadaira, Takashimadai, Itabashi-ku, Tokyo 302 (72) Inventor Yukihiro Kato 505-1 Hongo-cho, Funabashi-shi, Chiba Clio Nishifunabashi Ichibankan 606

Claims (3)

[Claims] 1. An ultrasonic transducer which outputs ultrasonic waves of a predetermined frequency, and ultrasonic waves which are coaxially integrated with the ultrasonic transducer and converge the ultrasonic waves output from the ultrasonic transducer. A horn portion, and a tubular handpiece body that holds the ultrasonic horn portion through a flange portion provided in the ultrasonic horn portion while disposing the ultrasonic transducer portion inside, An ultrasonic handpiece comprising an ultrasonic tool part at the tip of the ultrasonic horn part, wherein a U-shaped cross section having a through hole for the ultrasonic horn part at the center part at the tip part of the handpiece body. -Like front case is detachably equipped, and a gap is provided between this front case and the tip surface of the handpiece body for temporarily holding the cooling liquid, and the liquid introduction path leading to this gap is provided. Of the handpiece body A means for sending the cooling liquid in the front case toward the tip portion of the ultrasonic horn portion is provided in communication with the gap portion while being provided on the wall portion, and is connected to the collar portion on the inner diameter side of the ultrasonic horn portion. An annular protrusion is provided at a portion located between the ultrasonic transducer and a first O-ring for waterproofing is provided between the inner peripheral surface of the annular protrusion and the outer peripheral surface of the ultrasonic horn portion. Ultrasonic handpiece that is characterized. 2. The ultrasonic handpiece according to claim 1, wherein an annular pressing member that holds the flange portion of the ultrasonic horn portion together with the annular protruding portion is screwed to the tip end side of the handpiece body. A second O-ring for waterproofing is provided between the inner peripheral surface of the annular pressing member and the ultrasonic horn portion, and the outer peripheral surface of the annular pressing member and the inner peripheral surface of the handpiece body are An ultrasonic handpiece that is equipped with a third O-ring for waterproofing. 3. The ultrasonic handpiece according to claim 1 or 2, wherein a concave groove for holding the first O-ring is provided in the ultrasonic horn portion.