JP3519865B2 - Ultrasonic handpiece - Google Patents

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 relating to this ultrasonic handpiece
It shows in FIGS . Of these, FIG. 8 shows the overall configuration of an ultrasonic processing apparatus including an ultrasonic handpiece. In FIG. 8 , 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 . 8 , 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 his / her 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. 9 , 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) 50D coaxially equipped with the ultrasonic horn 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 tends 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. 9 , an annular collar portion 50Ba is sandwiched between 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 sandwiched, and the ultrasonic horn unit 50B is connected to the handpiece main body 50C while maintaining the state where the ultrasonic horn unit 50B is floated from the handpiece main body 50C, vibration or The ultrasonic horn 50B is displaced due to the inertial 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.

Further, in the above-mentioned conventional example, the coolant injection port is the tip of the ultrasonic horn section 50B, that is, the tool 50D.
When the ultrasonic horn unit 50B is long and narrow, if the cooling liquid supply passage is provided inside the horn, a large cross-sectional area of the cooling liquid supply passage cannot be taken, so that the cooling liquid is insufficient. In addition, the function of the ultrasonic horn is impaired when the cross-sectional area of the cooling liquid supply passage is increased.

[0013]

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 from propagating to the body of the handpiece for a long period of time, and to quickly and quickly cut the machining area. It is an object of the invention to provide an ultrasonic handpiece that can be sufficiently cooled and cleaned.

[0014]

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. The ultrasonic horn unit which is connected and converges the ultrasonic wave output from the ultrasonic vibrator, and the ultrasonic vibrator unit is disposed inside and the flange part provided in the ultrasonic horn unit A cylindrical handpiece body that holds the ultrasonic horn portion is provided, and an ultrasonic tool portion is provided at the tip of the horn portion.

At the tip of the handpiece body, a front case having a through hole for the ultrasonic horn in the center is detachably mounted. A gap is provided between the front case and the tip surface of the handpiece body to temporarily hold the cooling liquid.

Then, the liquid introduction path leading to this void is
In addition to being provided on the side wall portion of the handpiece body described above, a liquid injection hole extending toward the tip of the ultrasonic horn portion is provided at a predetermined location separated from the central axis portion of the front case by a predetermined distance ,
The cooling liquid sprayed from the liquid spray hole goes through the air and is processed.
It has a structure of pouring into .

Therefore, in the invention according to claim 1,
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 location 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 cooling cleaning liquid is poured directly into the processing portion without passing through the horn portion, the tool portion (ultrasonic tool portion) 6
Since the Bk and the second horn portion 6B can be easily cleaned and the liquid introduction path 13 is provided on 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, and operability can be improved in this respect.

Further, since the front case 10 can be easily attached / detached, if inconvenience such as clogging of the liquid injection hole 10A occurs during use, the front case 10 can be replaced immediately to cope with hole clogging or the like. can do.

According to a second aspect of the present invention, the front case described above is rotatably attached to the main body of the handpiece.

Therefore, according to the invention of claim 2,
In addition to functioning similarly to the invention described in claim 1 described above, depending on the position and direction of the surgical site (processed portion), as shown in FIG. 4, for example, the front case 10 is rotated to bring the liquid injection hole 10A to the optimum position. To set. In this case, the front case 10 can be rotated to accurately and easily guide the cooling cleaning liquid toward the surgical site (hatched portion) C.

According to the third aspect of the present invention, a plurality of the liquid injection holes described above are provided on the same circumference.

Therefore, in the invention according to claim 3,
In addition to functioning similarly to the invention described in claim 1, it is possible to uniformly cool or clean the entire processed portion.

According to the fourth aspect of the invention, the above-mentioned liquid injection hole is formed with a predetermined angle so that the liquid injection port side faces the ultrasonic horn part side.

Therefore, according to the invention of claim 4,
In addition to functioning similarly to the invention described in claim 1, the tip side of the ultrasonic horn section 6 can be cooled at the same time, and the cooling liquid can be relatively gently fed from the tip section of the ultrasonic horn section 6 at the processing point. Can be poured into the processing location.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIGS. First, in FIG.
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 portion 6 is provided with a first horn portion 6A having the above-mentioned collar portion 6a at its center portion, and is screwed on the same axis as the first horn portion 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.

A front case 10 having a U-shaped cross section (cap-shaped) is provided at the tip of the handpiece body 8 (on the side of the second horn 6B). This front case 10
Is provided with a through hole 10a for the ultrasonic horn portion 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 inside diameter of the front case 10 on the opening side (left side in FIG. 1) is formed slightly larger than the outside 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, shear 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 adjusting the pressure appropriately, whereby the cooling of the processed portion is performed. Can be done quickly. A rear end cap 1 for holding and guiding a signal input cable for inputting a vibrator drive signal is provided at the left end (rear end) in FIG. 1 of the cylindrical handpiece body 8.
4 is equipped. Further, at the rear end of the handpiece body 8, a liquid introducing pipe 15 for introducing a predetermined cooling cleaning liquid (irrigation liquid) into the liquid introducing passage 13 described above.
Is equipped with a connection.

An annular protrusion 8A is provided on the inner diameter side of the right end (tip) of the handpiece body 8 in FIG. Further, on the right side of the annular protrusion 8A in FIG. 1, a tubular and relatively thick annular pressing member 8B corresponding to the annular protrusion 8A is screwed on the inner diameter side of the handpiece body 8. There is. And this annular protrusion 8
The collar portion 6a provided on the ultrasonic horn portion 6 is sandwiched by A and the annular pressing member 8B, and the ultrasonic horn portion 6 is held by the handpiece body 8 by this. Reference numeral 8Bc indicates a locking hole for applying a rotational force to the annular pressing member 8B.

Here, the concave groove 6 for accommodating the O-ring is formed in the first horn portion 6A of the ultrasonic horn portion 6 facing the inner diameter surface of the annular protruding portion 8A in the handpiece body 8 described above.
Aa is formed, and an O-ring 16 for sealing the inside of the handpiece body 8 is housed in the groove 6Aa. In addition, on the inner diameter side and the outer diameter side of the above-mentioned annular pressing member 8B, respectively, the concave groove 6Ba for storing the O-ring,
6Bb is formed and equipped with O-rings 17 and 18, which further effectively seal the inside of the handpiece body 8.

O-rings 16 to 1 installed at these three locations
8 also has a function of absorbing a part of the vibration of the ultrasonic horn section 6 at the same time, whereby a part of the ultrasonic component propagating to the handpiece body 8 side is effectively absorbed. ing. Other configurations are the same as those of the conventional example described above.

Next, the operation and effects 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 first ultrasonic wave of the ultrasonic horn unit 6. The horn portion 6A and the second horn portion 6B are sequentially converged, and then the tool portion (ultrasonic tool portion) 6Bk at the tip portion 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 relatively well to a deep portion in a narrow place. 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 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.

Here, in the above embodiment, the case where one liquid injection hole 10A is provided in the front case 10 is illustrated, but two or four or more liquid injection holes 10A may be provided if necessary. Alternatively, as shown in FIG. 5A, three liquid injection holes 10A may be provided. FIG. 5 (B) is an explanatory diagram showing a water injection state in this case. In this way, it functions effectively for rapid cooling of the processed portion and quick cleaning.

In the above embodiment, the case where the liquid injection hole 10A is formed in the front case 10 so as to be parallel to the central axis of the handpiece body 8 has been illustrated, but as shown in FIG. The liquid injection port of the liquid injection hole 10A may be formed so as to be inclined to the ultrasonic horn portion 6 side to have an inclination angle θ. The water injection operation in this case is shown in FIG. This has the advantage that cooling and cleaning can be effectively performed from the central portion of the ultrasonic horn portion 6 toward the tip portion.

[0044]

Since the present invention is constructed and functions as described above, according to this, the front case can be reciprocally rotated, so that the setting position of the liquid injection hole can be freely changed, and therefore the cooling can be performed. The cleaning liquid (irrigation liquid) can be freely guided to the place intended by the operator, and the front case can be easily attached and detached, so if inconveniences such as clogging of the liquid injection hole occur during use. The hole can be immediately dealt with by replacing the front case.

Further, since the cooling cleaning liquid is directly poured from the outside to the processing portion without passing through the ultrasonic horn portion, the tool portion (ultrasonic tool portion) and the ultrasonic horn portion can be easily cleaned, Since the introduction path is provided in the side wall portion of the handpiece body, the structure of the tip portion is simplified, the visibility of the operator is not obstructed during use, and operability can be improved in this respect. An ultrasonic handpiece can be provided.

[Brief description of drawings]

FIG. 1 is a partially omitted sectional view showing an 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.

5 is a view showing another example of the front case of the ultrasonic handpiece disclosed in FIG. 1, FIG. 5 (A) is a partially omitted perspective view showing the attached state, and FIG.
[Fig. 4] is an explanatory view showing a water-filled state.

FIG. 6 is an enlarged partial cross-sectional view showing still another example of the front case of the ultrasonic handpiece disclosed in FIG.

FIG. 7 is an explanatory view showing a water injection operation of the embodiment shown in FIG.

FIG. 8 is an explanatory diagram showing an entire ultrasonic processing system including an ultrasonic handpiece in a conventional example.

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

[Explanation of symbols]

2 Ultrasonic handpiece 4 Ultrasonic transducer 6 Ultrasonic horn 6a collar part 6Bk ultrasonic tool section (tool section) 8 Handpiece body 10 front case 10A liquid injection hole 11 Void 13 liquid introduction path

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Naomi Takegawa 8-33-8 Takashimadaira, Itabashi-ku, Tokyo 302-72 Royal Heights Takashima 302 (72) Inventor Yukihiro Kato 505-1 Hongocho, Funabashi, Chiba Clio West Funabashi Ichibankan 606 (56) Reference JP-A-3-236835 (JP, A) JP-A-5-49648 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) A61B 17 / 00-18 / 28 B26F 3/00

Claims (4)

(57) [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, In an ultrasonic handpiece comprising an ultrasonic tool section at the tip of the ultrasonic horn section, at the tip section of the handpiece body, a front case having a through hole for the ultrasonic horn section in the center section is provided. The handpiece body is detachably equipped with a space for temporarily holding the cooling liquid between the front case and the tip surface of the handpiece body, and a liquid introduction path leading to the space is provided on the side wall of the handpiece body. Provided in the section With the central axis portion of the front case
A liquid injection hole directed to the tip of the ultrasonic horn at a predetermined distance from the liquid injection hole.
The ultrasonic handpiece is characterized in that the cooling liquid is poured into the processing location through the air . 2. The ultrasonic handpiece according to claim 1, wherein the front case is rotatably attached to the handpiece body. 3. The ultrasonic handpiece according to claim 1, wherein a plurality of the liquid injection holes are provided on the same circumference. 4. The ultrasonic handpiece according to claim 1, wherein the liquid injection hole is formed at a predetermined angle so that the liquid injection port side thereof faces the ultrasonic horn portion. .