JPH08275954A - Ultrasonic handpiece - Google Patents

Abstract

PURPOSE: To control effectively that vibration from an ultrasonic horn part is transmitted to a handpiece body and thereby to improve operability. CONSTITUTION: This ultrasonic handpiece is provided with a handpiece body 8 by which an ultrasonic horn part 6 is held via a flange part 7 provided on the ultrasonic horn part 6 as well as arranging an ultrasonic vibrator 4 parts therein, and an ultrasonic tool 10 which is provided on the same axis as the ultrasonic horn part 6 on the head part of the ultrasonic horn part 6. A cylindrical connecting part 7B is projectedly-arranged on the circumference rim part of the flange part 7 which is provided on the ultrasonic horn part 6 at a specified space 6K in relation to the outer face of the ultrasonic horn part 6 and also toward the direction of the ultrasonic vibrator 4 side, and the ultrasonic horn part 6 is engaged with the handpiece body 9 through this cylindrical connecting part 7B.

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 more particularly to an ultrasonic handpiece having a horn section for outputting ultrasonic waves of a predetermined frequency.

[0002]

2. Description of the Related Art Conventionally, in the medical field, various ultrasonic handpieces for surgery have been used relatively often as a substitute for various scalpels for surgery. Further, in the industrial field, various types of ultrasonic handpieces have been relatively often used conventionally for cutting plastics and the like.

FIG. 5 shows the overall structure of an ultrasonic processing apparatus including an ultrasonic handpiece in a conventional example. This FIG.
In the figure, reference numeral 50 indicates an ultrasonic handpiece for ultrasonic processing, reference numeral 52 indicates an ultrasonic oscillator, and reference numeral 54 indicates a plastic transparent bag containing physiological saline which is a cooling liquid. Further, reference numeral 54A indicates a cooling liquid introduction hose for feeding the cooling liquid in the transparent bag 54 to 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. 5, the above-mentioned ultrasonic oscillator 52 is provided with a first power switch 52A for turning on / off its operation and a second power switch for allowing an operator to operate with a foot. Foot switch 52
It is equipped with B. Reference numeral 55 indicates a stand for suspending the transparent bag 54 for the cooling liquid.

The ultrasonic handpiece 50, as shown in FIG. 4, is an ultrasonic transducer 50 that outputs ultrasonic waves of a predetermined frequency.
A, an ultrasonic horn unit 50B coaxially integrated with the ultrasonic transducer 50A and receiving and outputting the output from the ultrasonic transducer 50A, and the ultrasonic transducer 50A. The handpiece main body 50C is provided with a protruding sonic horn section 50B, and an ultrasonic tool (tool) 50D coaxially equipped with the ultrasonic horn section 50B is provided at the tip of the ultrasonic horn section 50B.

The above-mentioned ultrasonic horn section 50B has a thin plate-like annular collar section 50 around the ultrasonic transducer 50A side.
Ba, and the ring-shaped collar portion 50Ba is provided with a screw member 50Ca.
And sealing member 50Ce, sealing O-ring 50Cf
And the ultrasonic horn unit 5
OB is connected to the handpiece body 50C.

In the ultrasonic horn section 50B, a cooling liquid ejecting means 56 for injecting a predetermined cooling liquid toward the processed portion.
Is installed, whereby the thermal invasion (damage due to heat) of the processed portion due to overheating caused by the ultrasonic vibration of the tool 50D is effectively suppressed in advance. Reference numeral 56A indicates a cooling liquid introducing pipe for introducing a physiological saline solution as a cooling liquid. Further, reference numeral 56B is a cooling liquid for the tool 50D.
The nipple for introducing the cooling liquid provided in the ultrasonic horn unit 50B for discharging from the portion is shown.

[0008]

In the above-mentioned conventional example, the annular collar portion 50Ba is attached to the screw member 50Ca and the seal member 50Ce on the central axis of the ultrasonic handpiece 50.
It has a structure in which it is sandwiched via 50Cf, and thereby the ultrasonic horn portion 50B is arranged away from the inner wall of the surrounding handpiece body 50C. Therefore, it is difficult to fix the ultrasonic horn unit 50B with high accuracy and for a long period of time without touching the inner wall of the handpiece body 50C, and most of them are misaligned during use. For example, the collar portion comes into contact with the inner wall of the handpiece body 50C, the ultrasonic vibration is transmitted to the handpiece body 50C side, and the ultrasonic handpiece 50 as a whole is slightly vibrated, which is inconvenient.

Further, in the above conventional example, the screw member 5
The annular flange portion 50Ba described above is configured to be tightened by 0Ca from the right side (tool side) in FIG. 4, and the screw member 50Ca largely protrudes toward the ultrasonic horn portion 50B side. For this reason, when processing the processed part with the tool tip, the processed part may be hidden by the handpiece main body 50C or the screw member 50Ca, and the operability is poor. At the same time, when processing the inside of the recess, Screw member 50C
Since the distance L from the end of a to the tip of the tool (see FIG. 4) is short, it becomes difficult to cut deep parts.
There was an inconvenience.

Further, in the above-mentioned conventional example, as described above, the screw member 50Ca has a structure which largely protrudes toward the ultrasonic horn portion 50B, so that the annular collar portion 50Ba is formed.
Since the distance A (see FIG. 4) between the nipple 56B and the above-mentioned nipple 56B cannot be set small, the position where the cooling liquid introduction nipple 56B is installed is close to the ultrasonic focusing portion on the ultrasonic horn portion 50B. It has become. For this reason, the nipple 56B is constantly subjected to large vibrations, and thus the connecting member connected thereto is damaged by the vibrations.

[0011]

It is an object of the present invention to improve the disadvantages of the prior art, and particularly to effectively suppress the vibration of the ultrasonic horn from propagating to the body of the handpiece, thereby improving the operability and the entire apparatus. It is an object of the present invention to provide an ultrasonic handpiece with improved durability.

[0012]

According to a first aspect of the present invention, there is provided an ultrasonic transducer for outputting an ultrasonic wave having a predetermined frequency, and the ultrasonic transducer which is coaxially and integrally connected to the ultrasonic transducer. An ultrasonic horn unit for inputting and converging an output from a child, and an ultrasonic oscillating unit part is further arranged in the part, and the ultrasonic horn part is held through a collar part provided in the ultrasonic horn part. An ultrasonic handpiece comprising a handpiece main body and an ultrasonic tool coaxially mounted on the tip of the ultrasonic horn part, the collar part being provided on the ultrasonic horn part. A cylindrical connecting portion is provided at the circumferential end of the ultrasonic horn portion so as to be spaced apart from the outer surface of the ultrasonic horn portion by a predetermined space and toward the ultrasonic transducer side. Then, the ultrasonic horn portion is engaged with the handpiece body via the cylindrical connecting portion.

According to the second aspect of the present invention, an engaging screw portion is provided on the outer peripheral surface of the cylindrical connecting portion, and the ultrasonic horn portion is engaged with the handpiece body via the engaging screw portion.
The configuration is adopted.

According to a third aspect of the present invention, an O-ring groove for sealing is provided at the rising portion on the outer peripheral surface side of the cylindrical connecting portion described above. This aims to achieve the above-mentioned object.

[0015]

[Operation] First, when the entire apparatus is set to the operating state, the vibration A from the ultrasonic horn section 6 is not directly propagated from the peripheral end portion of the collar section 7 to the ultrasonic horn section 6 but its propagation direction. Is bent once, the cylindrical connecting portion 7 is used as vibration B.
It is propagated from B to the handpiece body 8. Therefore, the vibration energy propagated from the ultrasonic horn portion 6 to the handpiece body 8 is drastically reduced at the time when the direction is changed from the collar portion 7 to the cylindrical connecting portion 7B (due to the straightness of ultrasonic waves). The vibration transmitted to the handpiece body 8 is effectively suppressed.

FIG. 3 shows the experimental results obtained by measuring the relationship between the displacements of the vibrations A and B propagated to the handpiece body 8 and the thickness t of the collar portion 7 described above. In this experimental result, a case where the width of the collar portion 7 has a node of longitudinal vibration in the central portion is measured. As a result, the handpiece body 8
It was found that the propagation to the above-mentioned vibration was the B vibration described above, which was about half that of the conventional vibration (A vibration).

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 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. The ultrasonic handpiece 2 is integrally connected coaxially with the ultrasonic vibrator 4 that outputs ultrasonic waves of a predetermined frequency, and outputs the output from the ultrasonic vibrator 4. Ultrasonic horn unit 6 for input and convergence
And a handpiece body 8 in which the ultrasonic transducer 4 is housed and the ultrasonic horn portion 6 is projected and held. An ultrasonic tool (tool) 10 provided coaxially with the ultrasonic horn portion 6 at the tip of the ultrasonic horn portion 6, and a cooling liquid for injecting a cooling liquid to a portion to be processed by the tool 10. The injection means 12 is provided.

The ultrasonic horn portion 6 has a disk-shaped collar portion 7 in the central portion. The ultrasonic horn portion 6 has a cylindrical ultrasonic wave propagating portion 6A on the left side of the collar portion 7 in FIG. It is integrally connected to the sound wave oscillator 4. The ultrasonic horn portion 6 is provided with a horn portion 6B on the right side of the flange portion 7 in FIG. 1, and the tip end portion thereof is processed into a thin cylindrical shape to form a tool holding portion 6C. Then, the ultrasonic tool (tool) 10 for ultrasonic processing (treatment) described above is detachably attached to the tool holding portion 6C.

As a result, the ultrasonic vibration of the ultrasonic oscillator 4 is converged by the ultrasonic horn portion 6 and transmitted to the tool 10, and is used for ultrasonic processing through the tool 10. ing.

Further, as shown in FIG. 1, the collar portion 7 of the ultrasonic horn portion 6 has a cylindrical connecting portion 7B formed in a cylindrical shape.
Is provided coaxially with the ultrasonic transducer 4 in the direction described above and with an appropriate space 6k from the periphery of the ultrasonic horn portion 6. An engagement screw portion 7Ba is provided on the outer periphery of the cylindrical connecting portion 7B, and the engagement screw portion 7Ba is provided.
The handpiece body 8 described above is screwed through the.

That is, the ultrasonic transducer 4 and the ultrasonic horn portion 6 described above are engaged with and held by the handpiece body 8 through the engagement screw portion 7Ba of the cylindrical connecting portion 7B.

Further, as shown in FIG. 1, the cooling liquid jetting means 12 has a cooling liquid jetting port 12a provided at the tip of the ultrasonic horn section 6 and a predetermined jetting cooling liquid for the cooling liquid jetting port 12a. And a cooling liquid guide mechanism 14 for guiding.

The cooling liquid guide mechanism 14 enters from the side surface of the ultrasonic horn portion 6 described above and the cooling liquid injection port 1 described above.
2A, an L-shaped liquid discharge passage 14A, and a nipple 1 provided in a cooling liquid introduction portion of the liquid discharge passage 14A.
4B, a cooling liquid guide tube 14C that is installed in the above-mentioned handpiece body 8 and guides a predetermined cooling liquid sent from the outside toward the tip of the ultrasonic horn portion 6, and this cooling liquid guide tube 14C. It is constituted by a connecting pipe 14D mounted between the nipple 14B and the nipple 14B. The connecting pipe 14D is formed of a relatively soft member.

Therefore, the vibration of the ultrasonic horn portion 6 side is effectively prevented from being propagated to the handpiece body 8 side by the cooling liquid guide mechanism 14 at the connecting pipe 14D portion.

Further, in the present embodiment, the above-mentioned cooling liquid guide tube 14C has the handpiece body 8 as shown in FIG.
It is housed in a through hole 8B provided in the side wall of the. The through hole 8B is provided substantially parallel to the central axis of the handpiece body 8.

For this reason, the cooling liquid guide tube 14C is embedded in the handpiece body 8, and the cooling liquid introducing hose (in this embodiment, "cooling liquid guide tube") 54A, which has been generated in the conventional example, is operated. The inconvenience of the above-described conventional example, which is an obstacle, is almost completely eliminated, and the durability of the coolant guide mechanism 14 is increased.

Here, with respect to the coolant guide tube 14C, even if it is fixed to the outer periphery of the handpiece body 8,
The ends may be housed in the handpiece body 8 such that they project from predetermined positions on both ends of the handpiece body 8.

Furthermore, an O-ring groove 7Bb for sealing is provided at the rising portion on the outer peripheral side of the above-mentioned annular screw portion 7B. And the O-ring groove 7Bb for this seal
Is provided with a sealing O-ring 22, and an annular seal member 24 formed in an annular shape is provided at the end of the annular screw portion 7B on the ultrasonic transducer 4 side described above. Here, reference numeral 8A indicates an inner diameter flange portion that is provided so as to project on the inner diameter side of the handpiece body 8 and holds the above-mentioned annular seal member 24.

As a result, the ultrasonic horn portion 6 is engaged with the above-mentioned handpiece body 8 in a state of being sealed by the base end portion and the tip end portion of the annular screw portion 7B. The O-ring 22 and the annular seal member 24 also have a function of effectively absorbing vibration at the cylindrical connecting portion 7B.

Next, the situation of vibration propagation from the collar portion 7 of the ultrasonic horn portion 6 to the handpiece body 8 in the above embodiment will be described.

In this case, the vibration A from the ultrasonic horn unit 6
Is a cylindrical connection such as a vibration B in a state in which the propagation direction is bent once (to the left in FIG. 2) without being directly propagated from the peripheral end portion of the collar portion 7 to the ultrasonic horn portion 6. It is propagated from the portion 7B to the handpiece body 8. Therefore, the vibration energy propagated from the ultrasonic horn portion 6 to the handpiece body 8 is drastically reduced at the time when the direction is changed from the collar portion 7 to the cylindrical connecting portion 7B (due to the straightness of ultrasonic waves). The vibration transmitted to the handpiece body 8 is effectively suppressed.

FIG. 3 shows an experimental result obtained by measuring the relationship between the displacements of the vibrations A and B propagated to the handpiece body 8 and the thickness t of the collar portion 7 described above. In this experimental result, a case where the width of the collar portion 7 has a node of longitudinal vibration in the central portion is measured.

From the experimental results shown in FIG. 3, when the thickness t of the collar portion 7 is 0.6 [mm], the displacement of the amplitude of both the vibrations A and B can be suppressed to 1 [μm] or less. Therefore, it was found that the propagation to the handpiece body 8 is the B vibration described above, which is about half that of the conventional vibration (A vibration).

[0035]

Since the present invention is constructed and functions as described above, according to this, even though the ultrasonic horn portion is fixedly mounted on the main body of the handpiece, the engaging area is provided in the ultrasonic horn portion. Since it is set at a position shifted from the collar portion along the central axis, it is possible to effectively suppress the vibration component directly propagating from the collar portion to the handpiece body.
It is possible to halve the vibration propagation from the ultrasonic horn part to the handpiece body, and as described above, the engagement area between the handpiece body and the ultrasonic horn part is set along the central axis from the collar part of the ultrasonic horn part. The tool is set to a position offset from the tool on the opposite side, so that it is possible to effectively open the gap between the collar and the tool, so that it is possible to always visually check the cut location even when cutting inside the recess. Therefore, it is possible to provide an unprecedented excellent ultrasonic handpiece that can greatly improve operability.

[Brief description of drawings]

FIG. 1 is a partially omitted sectional view showing an embodiment of an ultrasonic hand piece according to the present invention.

FIG. 2 is an explanatory diagram showing a vibration propagation state of the collar portion disclosed in FIG.

FIG. 3 is an explanatory diagram showing measurement results of the thickness of the collar portion and the displacement level of ultrasonic vibration in FIG.

FIG. 4 is a partially omitted sectional view showing an example of an ultrasonic handpiece in a conventional example.

5 is an explanatory diagram showing an entire ultrasonic machining system including the ultrasonic handpiece disclosed in FIG. 4. FIG.

[Explanation of Codes] 2 Ultrasonic Handpiece 4 Ultrasonic Transducer 6 Ultrasonic Horn 6k Space 7 Collar 7B Cylindrical Connection 7Ba Engaging Screw 7Bb O-ring Groove 8 Handpiece Body 10 Ultrasonic Tool (Tool)

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

Claims (3)

[Claims] 1. An ultrasonic transducer that outputs ultrasonic waves of a predetermined frequency, and an ultrasonic horn that is integrally connected coaxially with the ultrasonic transducer and that receives and converges the output from the ultrasonic transducer. Section, a handpiece main body that holds the ultrasonic horn section through a collar section provided in the ultrasonic horn section and the ultrasonic oscillating section inside, and a tip of the ultrasonic horn section. In an ultrasonic handpiece provided with an ultrasonic tool coaxially equipped with the ultrasonic horn part in the part, at the peripheral end part of the collar part provided in the ultrasonic horn part, the ultrasonic horn part A cylindrical connecting portion is provided so as to be spaced apart from the outer surface by a predetermined space in a direction toward the ultrasonic transducer side, and the ultrasonic horn portion is attached to the handpiece body through the cylindrical connecting portion. Ultrasonic wave characterized by engaging Dopisu. 2. An engaging screw portion is provided on an outer peripheral surface of the cylindrical connecting portion, and the ultrasonic horn portion is engaged with the handpiece body via the engaging screw portion.
The described ultrasonic handpiece. 3. The ultrasonic handpiece according to claim 1, wherein an O-ring groove for sealing is provided at a rising portion on the outer peripheral surface side of the cylindrical connecting portion.