JP2003116870A - Ultrasonic hand piece and ultrasonic horn used for this - Google Patents

Abstract

PROBLEM TO BE SOLVED: To generally facilitate delicate control of a cutting motion and especially, to efficiently and safely perform a precise and fine surgery in a narrow and deep recessed part in an ultrasonic hand piece used for cutting a rigid tissue such as a bone. SOLUTION: An ultrasonic hand piece is provided with an ultrasonic oscillation mechanism, an outer cylindrical part and a horn fitted on one end of the outer cylindrical part and the horn comprises a main body part and a surgical knife part formed at the apex of this main body and for cutting the rigid tissue such as the bone and the end part of the knife part is formed of an operating part consisting of at least one face part avoiding a stress concentration to an objective site of the rigid tissue such as the bone and preventing an excess puncturing from occurring thereon and transmitting an oscillation to form a fine ground layer and an edge part for scraping the bone tissue finely ground by means of this operating part and a longitudinally passing-through passage is provided on the horn main body part and one of the ends is connected with at least one opening part and the other end is connected with a suction mechanism and/or a water feeding mechanism.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic handpiece used for cutting bones in biological surgery and an ultrasonic horn used for the same.

[0002]

2. Description of the Related Art In the medical field, ultrasonic handpieces have been widely used as one of various surgical instruments in the field of surgery. FIG. 9 is a view showing an ultrasonic hand piece A used particularly for cutting bone among such ultrasonic hand pieces. In the figure, reference numeral 1 is an outer cylinder portion that houses an ultrasonic vibration mechanism that includes a magnetostrictive type or electrostrictive type vibrator and outputs an ultrasonic wave of a predetermined frequency, and 2 is fitted and inserted into one end opening of the outer cylinder portion. By cutting the hard tissue 3 such as bone at its tip by the vibration transmitted from the ultrasonic vibration mechanism.
1a is a tube joint for sucking the irrigation liquid, cutting pieces, etc., 1b is heat generated at the tip portion due to vibration,
A tube joint 1c for injecting an irrigation liquid that cools frictional heat generated at the time of cutting a bone, and 1c is a case for supplying high-frequency electric energy to the ultrasonic vibration mechanism.
Bull. Due to the vibration transmitted from the ultrasonic vibration mechanism, the horn 2 vibrates at a predetermined frequency in the axial direction, and the tip is brought into contact with the hard tissue 3 such as bone to cut a required portion.

FIG. 10 is a diagram showing a cutting operation of a hard tissue such as a bone by the horn of the ultrasonic hand piece A.
A hook-shaped female portion 2a is formed at the tip of the horn 2, and the operator operates the ultrasonic handpiece A from the view direction indicated by the arrow C to move the horn 2 to the arrow B. While moving in the direction, the cutting of the required portion of the hard tissue 3 such as bone is performed by the tip of the female portion 2a that reciprocates in the direction of arrow A. When the mechanism of this cutting is analyzed, as shown in FIG. Vibration is transmitted from the tip of the female portion 2a to finely crush the P portion of the hard tissue H such as bone facing the distal end, and then the finely crushed portion is sequentially scraped by the distal end of the female portion 2a. Has been cut by.

[0004]

However, the tip of the female portion 2a has a stroke of 200 .mu.m and is usually 25,0.
It vibrates minutely at 00 cycles / second, and the speed of the tip reaches 50 km / h at the maximum. Therefore, stress concentrates at the abutting portion of the sharp tip,
The tip of the female portion 2a frequently has a case deeply penetrating inside. If the tip bites deeply into the tissue as described above, a large amount is cut at one time when cutting in the direction of the arrow B, and not only a large amount of ultrasonic vibration energy is required, but also the operation of the scalpel part by the operator. It also requires great power. In addition, since the tip of the knife portion is likely to be deeply pierced into the bone, it is difficult to finely control the cutting amount. Furthermore, in the above conventional technology,
Since the female part is formed so as to project at a right angle to the horn body, as shown in FIG.
The positional relationship with the surface was inevitably parallel, and the operator was forced to operate in the extremely narrow visual field shown in the direction of the arrow C. Further, in the above-mentioned conventional technique, when cutting hard tissue such as bone, the frictional heat generated between the oscillating horn and the bone to be cut by spraying an irrigation liquid or the like on the cutting site is used. I try to cool. However, if the cutting location is a recess, especially a deep recess, the irrigation liquid that has been sent will accumulate in the recess, and if the scalpel touches the area where water is accumulated, the water will be atomized due to vibration, so There was an inconvenience that it was disturbed. Further, when alternately performing bone cutting and crushing suction of a tumor formed around it, conventionally it is necessary to prepare a hand piece for bone cutting and a hand piece for crushing tumor and to use them separately. there were.

[0005]

SUMMARY OF THE INVENTION The present invention provides an ultrasonic vibration mechanism for outputting longitudinal ultrasonic vibration of a predetermined frequency, torsional ultrasonic vibration, or ultrasonic vibration combined by both longitudinal and torsional vibrations, and an ultrasonic vibration mechanism of this ultrasonic vibration mechanism. An outer cylinder portion that houses the sonic vibration mechanism, and a horn that is attached to one end of the outer cylinder portion and that cuts hard tissue such as bone by vibration transmitted from the ultrasonic vibration mechanism,
In an ultrasonic handpiece equipped with the horn, the horn comprises a main body portion and a female portion formed at the tip of the main body portion for cutting hard tissue such as bone, and at the end portion of the female portion, A work part composed of at least one surface part for eliminating stress concentration on a target site of hard tissue such as bone to prevent excessive puncture and transmitting vibration to form a fine crush layer, and a fine work piece by this work part. An edge portion for scraping the crushed bone tissue is formed on the horn body, and a suction passage vertically passing through the horn body portion is provided, and one end thereof is connected to one or more openings formed in the vicinity of the female portion. The other end is to be connected to a suction mechanism to solve the above conventional problems.

In the above structure, the female portion may be formed in a hook shape so as to project from the side wall of the main body portion at the tip of the main body portion.

Further, in the above structure, the opening degree of the hook-shaped knife portion with respect to the main body portion is set within a range in which the angle formed by the inner side surface of the hook-shaped knife portion and the side wall of the main body portion is larger than a right angle and smaller than two right angles. In some cases, the operator's visual field space can be secured between the part to be cut and the main body.

Further, in the above ultrasonic handpiece, an engaging portion may be formed on the working portion at the tip of the hook-shaped female portion to prevent sliding when contacting hard tissue such as bone.

Further, in the above description, the outer peripheral portion in the cross section of the hook-shaped knife portion has a curved shape, that is, the hook-shaped knife portion has, for example, a substantially arc shape in the cross section, and is cut between the main body portion and the knife portion. It may form a guide for bone tissue to facilitate the cutting operation.

Further, any one of the above-mentioned ultrasonic handpieces
1), one end of the suction passage is formed near the female portion.
In some cases, the other end is connected to the opening and the other end is connected to the suction mechanism and the water supply mechanism via the switch mechanism so that either suction or water supply can be selectively performed by operating the switch mechanism.

According to the present invention, an ultrasonic horn for cutting hard tissue such as bone by the vibration transmitted from the ultrasonic vibration source is formed on the main body and the tip of the main body. It consists of a scalpel that cuts hard tissue such as bone, and the end of the scalpel eliminates stress concentration on the target site of hard tissue such as bone to prevent excessive puncture and transmit vibration. A working portion including at least one surface portion for forming a finely crushed layer, an edge portion for scraping off bone tissue finely crushed by the working portion, and a suction passage extending vertically through the horn body. In order to solve the above-mentioned conventional problems, a structure is provided in which one end of the suction passage is connected to one or more openings formed in the vicinity of the female portion.

In the ultrasonic horn, the female portion may be formed in a hook shape so as to project from the side wall of the main body portion at the tip of the main body portion.

Further, in the above ultrasonic horn, the opening degree of the hook-shaped knife portion with respect to the main body portion is such that the angle formed between the inner side surface of the hook-shaped knife portion and the side wall of the main body portion is larger than a right angle and smaller than two right angles. It may be set to a certain range so that the operator's visual field space can be secured between the part to be cut and the main body.

Further, in the above ultrasonic horn, the working portion at the tip of the hook-shaped female portion may be formed with an engaging portion for preventing sliding when contacting with hard tissue such as bone.

Furthermore, in the above ultrasonic horn,
The outer peripheral portion in the cross section of the hook-shaped knife portion is curved, that is, the hook-shaped knife portion is formed, for example, in a substantially arc shape in the cross section, and forms a guide portion for the cut bone tissue between the main body portion and the knife portion. I have something to do.

[0016]

DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present invention will be described below. The ultrasonic horn described in each of the following embodiments is a constituent member of the ultrasonic handpiece A shown in FIG. 4, but the other structure except the horn member is exactly the same. A duplicate description will be omitted. FIG. 1 is a partially cutaway perspective view of an ultrasonic horn according to a first embodiment of the present invention.
Reference numeral 1 denotes a body portion 22 and a knife portion 23 formed at the tip of the body portion 22 for cutting hard tissue such as bone, and a working portion 23a is formed at the tip of the knife portion 23. The working portion 23a transmits vibrations by contact with hard tissue such as bone to form a finely crushed layer. The working portion 23a diffuses stress to a target portion of hard tissue such as bone and the female portion 23 causes It is composed of a flat surface to prevent excessive sticking into the hard tissue.

Then, the working unit 2 having a flat surface.
An edge portion 30 is formed on the peripheral edge of 3a, and scrapes finely crushed bone tissue by vibration transmission of the working portion 23a to perform a predetermined cutting. Further, the working portion 23a has a hole portion (opening portion) 32 for sucking and discharging the cut bone tissue fragment and the like together with the irrigation liquid.
Are formed. The hole portion (opening portion) 32 communicates with an external suction mechanism via a suction passage (not shown) that vertically penetrates the main body portion 22. In the embodiment, the working portion 23a has a circular shape, but is not limited to this shape, and may have a polygonal shape such as a square, a hexagon, and an octagon.

Further, in this embodiment, the working unit 2
3a is composed of one flat surface.
Since 3a may have a surface portion as a means for preventing stress from concentrating on a point or a line when contacting a tissue, it may be a curved surface or may have a desired multi-sided structure.

FIG. 2 is a view showing the structure of an ultrasonic horn according to the second embodiment of the present invention, in which (a) is a partially cutaway perspective view, (b), (c) (d), (D) is the sectional view. In the figure, reference numeral 21 denotes an ultrasonic horn, which is an outer cylinder of an ultrasonic handpiece including an ultrasonic vibration mechanism for outputting an ultrasonic wave of a predetermined frequency and an outer cylinder part for housing this ultrasonic vibration mechanism. A tip portion is attached to the open end of the portion so as to project, and hard tissue such as bone is cut by vibration transmitted from the ultrasonic vibration mechanism. This ultrasonic horn 21
The main body 22 and a hook-shaped female portion 23 that is formed so as to project from the side wall of the main body 22 at the tip of the main body 22 and comes into contact with living tissue, and the tip of the hook-shaped female portion 23 has
The work portion 23a for eliminating stress concentration on the target site of hard tissue such as bone to prevent excessive puncture and transmitting vibration to form a fine crush layer is formed by a flat surface. An edge portion 30 is formed on the peripheral edge of the portion 23a, and a predetermined cutting is performed by scraping off the fine crushed layer formed by the vibration transmission of the working portion 23a.

As described above, since the flat end surface as the working portion 23a is formed at the tip of the hook-shaped female portion 23 that comes into contact with hard tissue such as bone, unlike the case of the prior art having a sharp tip, There is no stress concentration on points or lines when contacting hard tissue such as bone, and an appropriate fine fracture layer can be formed in the cutting site of hard tissue such as bone within the required range, and the tip can be hard tissue such as bone. There is no inconvenience caused by sticking too deeply. Therefore, the cutting operation can be smoothly performed and fine control can be performed. Note that, as shown in FIG. 2B, it is desirable that the thickness a of the flat end portion 23a is set in a range of 0.5 mm <a <2.5 mm in consideration of cutting efficiency, operability, and the like. The result is known. Further, in the figure, reference numeral 32 denotes an opening formed in the vicinity of the hook-shaped female portion 23, which is communicated with an external suction mechanism (not shown) via a suction passage 33 which vertically penetrates the main body portion 22 and is generated during operation. Drain cuttings and irrigation liquid. It should be noted that one or more openings 32 are provided as shown. That is, in the embodiment shown in FIG. 2B, the opening 32 is formed in the main body 22 near the root of the hook-shaped female portion 23,
It communicates with the suction passage 33. Further, in the embodiment shown in FIG. 2C, the opening 32 is formed on the tip surface of the main body 22. Further, in the embodiment shown in FIG. 2 (d), the openings 32 are formed at two positions, one of them is at the same position as that of FIG. 2 (b), and the other is at the same position of FIG. 2 (c). Has been formed. The terminal of the suction passage 33 is connected to the suction mechanism and the water supply mechanism (external to the apparatus, not shown) via a switch mechanism (not shown) outside the apparatus, and either suction or water supply is performed by operating the switch mechanism. In some cases, it can be selectively performed.

3A and 3B are views showing the structure of an ultrasonic horn according to a third embodiment of the present invention, wherein FIG. 3A is a partially cutaway perspective view and FIG. 3B is a sectional view thereof. In the embodiment, the tip of the hook-shaped female portion 23 is formed in an arcuate cross section, and therefore the working portion 23a is formed into a curved surface, and one end of this curved surface is finely crushed by the vibration transmission of the working portion 23a. An edge 30 is formed for scraping bone tissue from the layer. As described above, since the working portion 23a has a curved surface structure, stress concentration does not occur at the time of abutting on hard tissue such as bone as in the above-described embodiments, and the cutting portion of hard tissue such as bone can be cut within a necessary range. An appropriate finely crushed layer can be formed, and the inconvenience caused by the tip sticking too deeply into hard tissue such as bone does not occur. Since the tip does not stick too deeply into hard tissue such as bone, the cutting operation can be performed smoothly and fine control is possible.

Further, the thickness of the circular arc portion 23a as the stress diffusion end face portion, that is, the thickness a of the portion of the bone facing the surface to be cut is 0 in consideration of cutting efficiency, operability and the like as in the above embodiment. Experiments have revealed that it is desirable to set the range of 0.5 mm <a <2.5 mm. Further, in the figure, reference numeral 32 denotes an opening formed in the vicinity of the hook-shaped female portion 23, which is communicated with an external suction mechanism through a suction passage 33 which vertically penetrates the main body portion 22, and which is a cutting piece generated during operation or It is designed to drain the irrigation liquid.
Then, one or more openings 32 are provided as shown. That is, in the embodiment shown in FIG. 3B, the opening 32 is formed in the main body 22 near the root of the hook-shaped female portion 23 and communicates with the suction passage 33. Further, in the embodiment shown in FIG. 3C, the opening 32 is formed on the tip surface of the main body 22. Furthermore, FIG.
In the embodiment shown in (d), the openings 32 are formed at two positions, one of which is formed at the same position as in FIG. 3 (b) and the other of which is formed at the same position as in FIG. 3 (c). . The terminal of the suction passage 33 is provided with the suction mechanism and the water supply mechanism (external to the device via a switch mechanism (not shown) outside the device,
In some cases, either suction or water supply can be selectively performed by operating the switch mechanism.

FIG. 4 is a sectional view showing the structure of an ultrasonic horn according to the fourth embodiment of the present invention. In this embodiment, an engaging portion is formed on the surface of the tip of the hook-shaped female portion 23 that constitutes the working portion 23a to prevent sliding when contacting hard tissue such as bone. In FIG.
(A), (b), (c) are working parts (stress diffusion end face parts)
23a shows a case where several curved surface protrusions are formed as the engaging portion 23b.

Further, FIGS. 4D, 4E, and 4F show the case where a hill portion is formed as the engaging portion 23b. These engaging portions 23b can be formed on any of the stress diffusion end face portions 23a shown in FIGS. As described above, by providing the engaging portion 23b on the working portion 23a, it is possible to prevent unexpected sliding from occurring at the tip of the hook-shaped female portion 23 during cutting, and more precise cutting control becomes possible. Note that, in these embodiments, the edge portion is formed on the peripheral edge of the working portion 23a, as in the above-described embodiments. Further, in the figure, reference numeral 32 denotes an opening formed in the vicinity of the hook-shaped female portion 23, which is communicated with an external suction mechanism through a suction passage 33 which vertically penetrates the main body portion 22, and which is a cutting piece generated during operation or It is designed to drain the irrigation liquid. Then, the opening 32 is
One or more are provided. That is, in FIG.
In the embodiment shown in (d), the opening 32 is formed in the main body 22 near the root of the hook-shaped female portion 23, and the suction passage 3 is formed.
It communicates with 3. Further, in the embodiment shown in FIGS. 4B and 4E, the opening 32 is formed on the tip surface of the main body 22. Further, in the embodiment shown in FIGS. 4 (c) and 4 (f), the opening 32 is formed at two locations, one of which is at the same position as in FIGS. 4 (a) and 4 (d) and the other of which is shown in FIG.
It is formed at the same position as in (b) and (e). In addition,
The terminal of the suction passage 33 is a switch mechanism (not shown) outside the device.
In some cases, the suction mechanism and the water feeding mechanism (external to the apparatus, not shown) are connected via the, and either suction or water feeding can be selectively performed by operating the switch mechanism.

FIG. 5 is a sectional view showing the structure of an ultrasonic horn according to the fifth embodiment of the present invention. In this embodiment, the opening θ of the hook-shaped female portion 23 with respect to the horn body 22
Is set to a range where the angle between the inner surface of the hook-shaped knife and the side wall of the body or the angle between the inner surface of the hook-shaped knife and the center axis of the body is greater than a right angle and less than two right angles. In addition, the operator's visual field space can be secured between the part to be cut and the main body.

That is, as shown in FIG. 5A, the angle θ formed by the inner side surface 23c of the hook-shaped female portion 23 and the side wall of the main body portion 22 is set to about 120 degrees. Therefore, in FIG.
As shown in (b), the horn body 22 can be inclined to cut the hard tissue H such as bone, so that the operator can secure a wide field of view as indicated by the arrow. Since it can be operated while checking, more appropriate cutting is possible. In addition, the hook-shaped female portion 23 with respect to the horn body portion 22 described here.
It goes without saying that the configuration relating to the setting of the opening degree can be applied to the ultrasonic horn according to FIGS. Also,
The configurations related to the working unit and the edge unit are the same as those in the above-described embodiments. Although not shown, an opening is formed in both or one of the working portion 23a and the inner side surface 23c of the hook-shaped female portion 23, and suction is formed so as to vertically penetrate the opening in the main body portion 22. The cutting piece or the irrigation liquid generated during the operation may be discharged by communicating with an external suction mechanism through the passage. Incidentally, the opening, the suction path, the water supply port for the ligation liquid,
The fact that it may act as a water supply channel is the same as in each of the above-described embodiments.

FIG. 6 is a perspective view showing the structure of an ultrasonic horn according to the sixth embodiment of the present invention. In this embodiment, the hook-shaped female portion 23 resembles a spoon shape, the working portion 23a has a concave curved surface, and the edge portion 30 is formed at the upper end edge of the working portion 23a. The concave curved surface portion of the working portion 23a functions as a cutting piece guiding portion, and by providing an opening communicating with the suction tube in the concave curved surface portion, it is extremely easy to discharge the irrigation liquid and the cutting piece. Can be done. That is, as shown in FIG.
In the vicinity of the female part of the ultrasonic horn shown in Fig. 1, one or more openings are provided to form a suction path that passes through the horn main body and is connected to the suction mechanism. , Facilitates suction removal of crushed pieces, etc., and realizes proper and efficient surgery. In FIG. 7A, reference numeral 33 denotes a suction passage that penetrates the horn body 22 and is connected to a suction mechanism (not shown).
The concave curved surface portion 3a has an opening 32. Also,
In the ultrasonic horn shown in FIG. 7B, the suction passage 33 has two openings 32, one of which is formed at the same position as the position shown in FIG. 7A and the other of which is a horn. It is formed outside the vicinity of the female portion 23 at the tip of the main body portion 22. Then, in the ultrasonic horn shown in FIG.
The opening 32 is formed outside the vicinity of the female portion 23 at the tip of the horn body 22. Moisture, cutting pieces, crushed pieces, and the like in the surgical site are sucked in the opening 32 and discharged through the suction passage 33 as shown by the arrow.

FIG. 8 is a sectional view showing the structure of an ultrasonic horn according to the seventh embodiment of the present invention. In this embodiment, the outer portion in the cross section of the hook-shaped female portion has a curved shape. That is, in the ultrasonic horn shown in FIG. 8A, a hook-shaped female portion 23 which is curved and drawn is integrally formed at the end of the tapered horn body 22. In other words, the upper surface portion 24 and the lower surface portion 25 of the hook-shaped female portion 23 are formed into arcuate curved surfaces having a predetermined diameter, and the working portion 2 having one or more flat surfaces and / or curved surfaces at the tip portion.
3a is formed, and an edge portion is formed on the peripheral edge thereof. The working portion 23a may be provided with the above-mentioned engaging portion 23b, if necessary.

Further, in the ultrasonic horn shown in FIG. 8 (b), the hook-shaped female portion 23 is formed so as to form a cutout portion at the inner (side facing the bone) end portion of the horn body portion 22. It has a substantially arcuate cross section. That is, the upper surface portion 24 and the lower surface portion 25 of the hook-shaped female portion 23 are formed in an arc curved surface having a predetermined diameter as in the case of (a), and the tip portion is formed of one or more flat surfaces and / or curved surfaces. It has a working unit 23a. Further, in the drawing, reference numeral 26 is a cutting piece guide portion having a semicircular cross section formed at the inner (side facing the bone) end of the horn body portion 22, and the edge portion 30 is formed from the fine crushed portion. The scraps scraped off are guided here. Here, again, the working portion 23a is formed with the above-mentioned engaging portion 23b, if necessary. In the embodiment shown in FIG. 8, the hook-shaped female portion 23 adopts the above-mentioned configuration, so that the operator can cut the hard tissue such as bones as shown in FIG.
Similar to the case shown in (1), since the ultrasonic horn can be used in a state of being inclined with respect to the cutting surface of the bone, a wide field of view can be obtained. Further, although not shown, an opening is formed in both or one of the upper surface 24 of the working portion 23a and the hook-shaped female portion 23 or the cutting piece guiding portion 26, and the opening is vertically penetrated into the main body portion 22. In some cases, a cutting piece or an irrigation liquid generated during operation may be discharged by communicating with an external suction mechanism via a suction passage formed so as to pass therethrough.

In each of the embodiments shown in FIGS. 7 and 8, one end of the suction passage 33 communicates with one or more openings 32 formed near the female portion 23, and the other end of the suction passage 33 has a switch mechanism. In some cases, the suction mechanism and the water feeding mechanism are communicated with each other via the switch mechanism so that either suction or water feeding can be selectively performed. As a result, the device can be downsized, the easiness of the cutting operation can be ensured, and the fine and efficient cutting operation can be realized especially in a narrow deep recess.

In the present invention, the working portion avoids the concentration of vibration energy at a point or a line at the time of contact with a hard tissue such as a bone, so that the fine crushed layer is more than necessary in the depth direction. It is intended to prevent the harmful effects caused by the expansion. Therefore, the working unit inevitably has a surface in order to perform the above-mentioned action, and this surface may be a single or plural, and may be flat or curved. The point is that if energy dispersive transfer can be realized. Good. Further, in the present invention, the generated cutting pieces, the discharge of the irrigation liquid, etc. can be executed during the continuous cutting operation, and since the discharge path is also stored inside the ultrasonic horn, the work especially in the deep and narrow recessed portions can be performed. It will be extremely easy. Furthermore, since the suction passage can also be used as a water supply passage, the device can be downsized and the cutting operation can be facilitated.

[0032]

[Additional remark 1] An ultrasonic horn for cutting hard tissue such as bone by vibration transmitted from an ultrasonic vibration source, the horn being a main body and a tip of the main body. And a hook-shaped female portion projecting outward from the horn body for cutting hard tissue such as bone, the female portion having a distal end portion formed on a spherical surface or a curved surface and an outward portion. The work surface is composed of the inner surface (the surface opposite to the tip) of the protruding portion and the edge portion composed of the edge of the work surface. An ultrasonic horn which is provided with the above-mentioned opening and which is connected to a passage vertically penetrated through the main body as a passage for sucking a cutting piece or sending cooling water to a cutting portion.

[Additional Item 2] The ultrasonic horn according to Additional Item 1, wherein the opening is further provided on the distal end surface of the female portion.

[Additional Item 3] An ultrasonic horn for cutting hard tissue such as bone by vibration transmitted from an ultrasonic vibration source, the horn being a main body and a tip of the main body. And a hook-shaped female portion projecting outward from the horn body for cutting hard tissue such as bone, the female portion having a distal end portion formed on a spherical surface or a curved surface and an outward portion. The work surface is composed of the inner side surface of the projecting portion (the surface opposite to the tip portion), and the edge portion is composed of the edge of the work surface. The tip portion is provided with an opening. An ultrasonic horn in which the opening is communicated with a passage longitudinally penetrating the main body as a passage for sucking a cutting piece or sending cooling water to a cutting portion.

[0033]

According to the invention of the present application, the following effects can be expected by virtue of the above-described constitutional operation. (1) Preventing various harmful effects resulting from the piercing of the scalpel part into the part to be cut more deeply than necessary, and the motion of the scalpel part can be delicately controlled, so that proper bones, etc. according to the therapeutic purpose can be obtained. Hard tissue can be cut. (2) Since the operator can always grasp the cutting situation in a wide field of view, the work is safe and easy. (3) The generated cutting pieces, irrigation liquid, etc. can be discharged while the cutting operation is continuing, and the discharge path is also stored inside the ultrasonic horn, making it extremely easy to work especially in deep and narrow recesses. Therefore, precise and safe surgical work can be performed quickly and easily. (4) By using the suction passage and the water supply passage in common, the device can be downsized and the easiness of cutting operation can be secured.
In particular, a fine and efficient cutting operation can be realized in a narrow deep recess.

[Brief description of drawings]

FIG. 1 is a perspective view and a cross-sectional view showing an ultrasonic horn according to a first embodiment.

FIG. 2 is a perspective view and a sectional view showing an ultrasonic horn according to a second embodiment.

FIG. 3 is a sectional view showing an ultrasonic horn according to a third embodiment.

FIG. 4 is an explanatory diagram showing an ultrasonic horn according to a fourth embodiment.

FIG. 5 is a sectional view showing an ultrasonic horn according to a fifth embodiment.

FIG. 6 is a perspective view showing an ultrasonic horn according to a sixth embodiment.

FIG. 7 is a sectional view showing an ultrasonic horn according to a sixth embodiment.

FIG. 8 is a sectional view showing an ultrasonic horn according to a seventh embodiment.

FIG. 9 is a side view showing a conventional ultrasonic handpiece.

FIG. 10 is a cross-sectional view showing a cutting state of bone by a conventional ultrasonic horn.

FIG. 11 is an explanatory diagram showing a state of formation of a finely crushed layer by a conventional ultrasonic horn.

[Explanation of symbols]

A. ． ． ． ． ． ． ． ． Ultrasonic handpiece 21. ． ． ． ． ． ． ． Ultrasonic horn 22. ． ． ． ． ． ． ． Ultrasonic horn body 23. ． ． ． ． ． ． ． Hook female part 23a. ． ． ． ． ． ． Stress diffusion end face (female end) 23b. ． ． ． ． ． ． Engagement part 24. ． ． ． ． ． ． ． Top surface of hook-shaped knife 25. ． ． ． ． ． ． ． Lower surface of hook-shaped knife 26. ． ． ． ． ． ． ． Cutting piece invitation part 30. ． ． ． ． ． ． ． Edge part 32. ． ． ． ． ． ． ． Aperture 33. ． ． ． ． ． ． ． Suction path

Claims (11)

[Claims] 1. An ultrasonic vibrating mechanism for outputting longitudinal ultrasonic vibration of a predetermined frequency, torsional ultrasonic vibration, or ultrasonic vibration combined by both longitudinal and torsion, and an outer cylinder accommodating the ultrasonic vibrating mechanism. And a horn that is attached to one end of the outer cylindrical portion and that cuts hard tissue such as bone by vibration transmitted from the ultrasonic vibration mechanism. Is composed of a main body and a scalpel formed at the tip of the main body to cut hard tissue such as bone. At the end of the scalpel, stress concentration on the target site of hard tissue such as bone is eliminated. To prevent excessive puncture and to transmit vibrations to form a finely crushed layer, and a working portion composed of at least one surface portion, and an edge portion for scraping finely crushed bone tissue by this working portion. And the horn body An ultrasonic handpiece having a suction passage vertically extending therethrough, one end of which is connected to one or more openings formed in or near the female portion and the other end of which is connected to a suction mechanism. 2. The ultrasonic handpiece according to claim 1, wherein the female portion is formed in a hook shape so as to project from the side wall of the main body portion at the tip of the main body portion. 3. The opening of the hook-shaped knife portion with respect to the main body portion according to claim 2, in a range in which an angle formed by an inner surface of the hook-shaped knife portion and a side wall of the main body portion is larger than a right angle and smaller than two right angles. An ultrasonic hand piece characterized by being set so that a visual field space for the operator can be secured between the part to be cut and the main body. 4. The ultrasonic handpiece according to any one of claims 1 to 3, wherein the working portion at the tip of the female portion is formed with an engaging portion for preventing slippage in contact with hard tissue such as bone. -Su. 5. The hook-shaped scalpel part is formed in a substantially arc shape in its cross section, and a cut-out bone tissue guiding part is formed between the main body part and the scalpel part.
Either ultrasonic handpiece. 6. The ultrasonic handpiece according to claim 1, wherein one end of the suction passage is connected to one or more openings formed in the vicinity of the female portion, and the other end is connected via a switch mechanism. An ultrasonic handpiece, characterized in that it is connected to a suction mechanism and a water supply mechanism, and that either suction or water supply can be selectively performed by operating the switch mechanism. 7. An ultrasonic horn for cutting hard tissue such as bone by vibration transmitted from an ultrasonic vibration source, the horn being a main body and a tip of the main body. It is composed of a scalpel part that is formed on and cuts hard tissue such as bone, and the end of the scalpel part eliminates stress concentration on the target site of hard tissue such as bone to prevent excessive puncture and to prevent vibration. A working part composed of at least one surface part for transmitting and forming a finely crushed layer, an edge part for scraping off the bone tissue finely crushed by this working part, and a piercing body vertically through the horn body part. A suction path is provided, one end of the suction path is connected to one or more openings formed in the vicinity of the female portion, and the other end can be connected to a suction mechanism outside the horn. -N. 8. The ultrasonic horn according to claim 7, wherein the female portion is formed in a hook shape so as to project from the side wall of the main body at the tip of the main body. N. 9. The ultrasonic horn according to claim 8, wherein an opening angle of the hook-shaped knife portion with respect to the main body portion is larger than a right angle between an inner surface of the hook-shaped knife portion and a side wall of the body portion. An ultrasonic horn characterized by being set to a range smaller than 2 right angles so that a visual field space for the operator can be secured between the part to be cut and the main body. 10. The ultrasonic hob according to any one of claims 7 to 9, wherein an engaging portion is formed on the working portion at the tip of the female portion to prevent sliding when contacting hard tissue such as bone. -N. 11. The hook-shaped knife portion is formed in a substantially arc shape in its cross section, and a cut-out bone tissue guide portion is formed between the body portion and the knife portion. Either ultrasonic horn.