JPH05146468A - Ultrasonic cutter - Google Patents

Abstract

PURPOSE:To provide the ultrasonic cutter improving the performance at the time of exchanging the cutter and making an effective progress of the cutting process by an operator. CONSTITUTION:The ultrasonic cutter is provided with a horn 7 having a groove part 7c for attaching a cutter to a tip part 7A and vibrating by the application of the vibration from an ultrasonic generator and a cutter 4. A tip part 7 of the horn 7 is covered with a rubber cover 2 of the low thermal conductivity in the state pierced by the cutter 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic cutter, and more particularly to an ultrasonic cutter suitable for cutting a fixing material for fixing an affected part of an orthopedic disease.

[0002]

2. Description of the Related Art In orthopedic diseases such as fractures, dislocations, sprains, and deformations, a so-called cast (Gy) which uses calcined gypsum as a hardening material is used for fixing, supporting, protecting or correcting the affected part.
ps) or a fixing material such as a plastic cast that uses a synthetic resin as a hardening material to fix the affected area. The affected part is fixed by wrapping a linear bandage or a tube-shaped bandage made of a wire or polyester on the affected part, and winding a fixing material such as a cast on the bandage and hardening the bandage.

[0003] These fixing materials must be cut or removed partially or frontally for the treatment of the affected area or the healing of the affected area. In order to cut the fixing material in such a case, many power cutters, wire cutters, hot blade cutters, ultrasonic cutters, etc. have been developed and put into practical use.

Recently, ultrasonic type cutters, which have a relatively quiet sound and a large cutting ability, are relatively widely used. This ultrasonic cutter cuts the fixing material with a cutting blade vibrated by an ultrasonic vibrator, and specifically, is shown in FIGS. 6 to 7 (arrow A shown in FIG. 6).
Horn 7 having a groove portion 7C for attaching a cutting blade at a tip end portion 7A as shown in a view as viewed in the direction of arrow) and vibrating by vibrating force from an ultrasonic generator (not shown); The groove 7C is constituted by a cutting blade 4 which is detachably mounted by a bolt 7F or the like. Also, bolt 7F
Uses a hexagon socket head cap screw and can be tightened with a hexagon wrench or the like. Further, the tip portion 7A of the horn 7 has a structure that is directly exposed to the outside in consideration of convenience when attaching the cutting blade 4.
And in actual use, the tip portion 4A of the cutting blade 4
Is applied to a fixing material (not shown), and the fixing material is broken by vibration and cut and removed.

[0005]

However, in the above-mentioned conventional example, heat is generated at the tip of the horn due to the vibration of the horn itself and the friction between the tip of the cutting blade and the fixing material. Therefore, when exchanging the cutting blade mounted on the tip of the horn when this heat is generated, the operator or the like needs to take protective measures such as putting on gloves or wrapping cloth on the tip of the horn. It was This has a disadvantage in that it cannot cope with speeding up of the cutting blade replacement work, and hinders improvement in overall work efficiency. Further, during the cutting operation, cutting dust or the like flying from the cut object (fixing material) enters the groove for attaching the cutting blade at the tip of the horn, and the cutting dust or the like accumulates in the groove. For this reason, the cutting blade cannot be easily attached to and detached from the tip of the horn, and the resonance point during horn design is also changed, and stable vibration of the horn itself cannot be ensured. There was an inconvenience that it hindered me.

[0006]

An object of the present invention is to improve the inconveniences of the prior art, in particular, to improve the workability at the time of exchanging a cutting edge in an ultrasonic cutter, and to improve the cutting work by an operator. The purpose is to provide a type cutter.

[0007]

According to the present invention, a horn having a groove for attaching a cutting blade at its tip end and vibrating by vibrating force from an ultrasonic generator, and a groove part of this horn are detachably mounted. Equipped with a cutting edge. Then, the tip of the horn is covered with a member having low thermal conductivity while the cutting blade penetrates. This is trying to achieve the previously mentioned objectives.

[0008]

The heat generated by ultrasonic vibration at the tip of the horn is blocked by the member having low thermal conductivity and does not reach the outer surface of the member having low thermal conductivity. Further, the groove for attaching the cutting blade at the tip of the horn is protected by the member having low thermal conductivity.

[0009]

Embodiments of the present invention will be described below with reference to FIGS.

[0010]

[First Embodiment] FIG. 1 is a cross-sectional view in which a lead wire and the like of an ultrasonic cutter according to a first embodiment of the present invention are omitted. This ultrasonic cutter 1 shown in FIG.
Is a groove portion 7C for attaching a cutting blade to the tip portion 7A (see FIG. 2).
And a cutting blade 4 detachably attached to the groove portion 7C of the horn 7, and the horn 7 is pierced by the ultrasonic generator 1A. The tip portion 7A of the horn 7 is covered with a rubber cover 2 as a member having low thermal conductivity.

More specifically, the apparatus as a whole is housed in the ultrasonic generator case 1B, and only the vicinity of the tip 7A of the horn 7 equipped with the cutting blade 4 is removed from the ultrasonic generator case 1B. It is in a protruding state.

As shown in FIG. 1, the case 1B houses the ultrasonic wave generator 1A as described above. The ultrasonic wave generator 1A includes an ultrasonic wave converter 5 and a booster 6. A horn 7 is arranged at the right end (right side in FIG. 1) of the booster 6. The ultrasonic transducer 5 includes an aluminum block 8 and electrodes 9 which are sequentially arranged.
A, one ceramic vibrator 10, an electrode 9B, and the other ceramic vibrator 11, which are fastened and fixed to the booster 6 from the end surface on the aluminum block 8 side by a bolt (not shown). That is,
The ceramic vibrators 10 and 11 are sandwiched by the aluminum block 8 and the booster 6 via the electrodes 9A and 9B, and constitute a so-called inner circumference tightening type bolted Langevin vibrator. Here, the booster 6 is the ultrasonic transducer 5
It has a function of amplifying the ultrasonic vibration generated in 1 and transmitting it to the horn 7.

The horn 7 has a shape in which a small diameter portion 7D is provided at one end, a large diameter 7B is provided at the other end, and an intermediate portion 7E between the two is formed in a substantially exponential shape. There is. This horn 7 is a booster 6
1 is fixed to the right side in FIG. Also, the large diameter portion 7B and the intermediate portion 7 of the horn 7
The boundary with E corresponds to the position where the amplitude of the ultrasonic wave (standing wave) generated by the ultrasonic transducer 5 is zero, and the horn 7 is fixed to this part in the ultrasonic generator case 1B. The flange 12 is integrally provided. The flange 12 is used as the recess 3 formed on the inner peripheral surface of the case 1B.
The ultrasonic generator 3 and the horn 7 are fitted to the ultrasonic generator 3.
The structure is fixed to the ultrasonic generator case 1B. The electrodes 9A and 9B are actually connected to a known oscillation circuit (not shown) via a lead wire (not shown) led out from the ultrasonic generator 1B. The ceramic vibrators 10 and 11 generate an ultrasonic wave (electrical vibration is converted into mechanical vibration) by being energized by.

The tip portion 7A of the small-diameter portion 7D of the horn 7 described above is used for attaching the cutting blade 4 as shown in FIGS. 2 to 3 (a view seen in the direction of arrow B in FIG. 2). The groove portion 7C is formed. The groove portion 7C is the groove portion 7C.
The widthwise dimension of the groove portion 7C is substantially the same as the widthwise dimension of the cutting blade 4 in consideration of the convenience of attaching the cutting edge 4 to the blade, and only the dimension of the groove portion 7C in the thickness direction is cut. Blade 4
Is formed longer than the dimension in the plate thickness direction. Then, the cutting blade 4 is attached to the tip portion 7A of the small diameter portion 7D of the horn 7 by tightening the hexagon socket head cap bolt 7F in a state where a part thereof is inserted in the groove portion 7C.

A rubber cover 2 is attached to the tip portion 7A of the small diameter portion 7D of the horn 7. The rubber cover 2 is formed of a member having low heat conductivity, and a through hole 2A for allowing the cutting blade 4 to penetrate is provided near the center thereof. The shape of this through hole 2A is formed so as to be in close contact with the periphery of the cutting edge 4. Further, the inner diameter of the rubber cover 2 is formed to be slightly smaller than the diameter of the tip portion 7A of the small diameter portion 7D of the horn 7. For this reason, when the rubber cover 2 is mounted on the tip portion 7A of the horn 7 in a state where the rubber cover 2 is temporarily unfolded, the contraction action of the rubber cover 2 with respect to the tip portion 7A of the horn 7 works and the rubber cover 2 is attached to the tip of the horn 7. It is fixed to the portion 7A. Further, at this time, the groove portion 7C for attaching the cutting blade 4 is covered with and protected by the rubber cover 2.

As described above, according to this embodiment,
Since the tip portion 7A of the horn 7 is covered with the rubber cover 2 as a member having low thermal conductivity in a state where the cutting blade 4 penetrates, the rubber cover 2 blocks heat generated by ultrasonic vibration of the horn tip portion 7A. And is not transmitted to the outer surface of the rubber cover. Therefore, even when exchanging the cutting blade 4 during cutting work, the operator or the like can easily touch the horn tip portion 7A through the rubber cover 2 without taking any protective action, and the cutting blade 4 can be replaced. It can be done quickly. Further, cutting dust or the like flying from the cut object during the cutting operation is blocked by the rubber cover 2 and does not enter the groove 7C for attaching the cutting edge of the horn tip portion 7A. That is, in other words, it is possible to effectively prevent a state in which cutting dust or the like enters the groove portion 7C and accumulates therein. Therefore, the weight of the horn tip can be kept constant,
The resonance point at the time of design does not change. Therefore, the same vibration at the tip of the horn can be maintained for a long time, and the workability at the time of cutting by the operator is improved. Further, since cutting dust and the like do not accumulate in the groove portion 7C, the cutting edge 4 can be easily attached and detached.

[0017]

[Second Embodiment] Next, a second embodiment according to the present invention will be described with reference to FIGS. 4 to 5 (a view taken in the direction of arrow C shown in FIG. 4).

The embodiment shown in FIG. 4 has an ultrasonic wave generator 1A (see FIG. 1) having a groove portion 7C for attaching a cutting edge at the tip portion 7A.
A horn 7 that vibrates by vibrating force from, and a cutting blade that is detachably mounted in a groove portion 7C of the horn 7,
The brim-shaped member 3 corresponding to the tip portion 7A of the horn 7 is attached to a predetermined position of the cutting blade 4 in a state where the cutting blade 4 penetrates.

That is, in this embodiment, instead of the rubber cover 2 of the first embodiment described above, a collar-shaped member 3 corresponding to the tip portion 7A of the horn 7 is provided, and this collar-shaped portion 3 is formed by the cutting blade 4. It is characterized in that it is attached to a predetermined position of the cutting blade 4 in a penetrating state. The brim-shaped member 3 is formed of a rubber-like member having a low heat conductivity, and has a circular shape as a whole. Further, in the substantially central portion of the collar-shaped member 3,
A through hole 3 </ b> A is formed which penetrates the cutting blade 4 and serves as a mounting portion for the cutting blade 4. The shape of this through hole 3A is
It is formed to be slightly smaller than the outer peripheral shape of the cutting edge 4 in the width direction. Therefore, when the brim-shaped portion 3 is passed through the cutting blade 4 with the through hole 3A temporarily widened somewhat and the brim-shaped portion 3 is attached to a predetermined position of the cutting blade 4, the brim with respect to the cutting blade 4 is formed. The contraction action of the through hole 3A in the shaped portion 3 works so that the collar shaped portion 3 is fixed to a predetermined position of the cutting blade 4. FIG. 4 shows a state in which the brim-shaped portion 3 is attached to the cutting blade 4 in a state of being in close contact with the horn tip portion 7A. Regarding other configurations and operations, the above-mentioned first
It is equivalent to the example.

Also in this second embodiment, intrusion of cutting dust and the like into the groove portion 7C can be effectively prevented, and at the time of exchanging the cutting blade 4, the operator or the like can insert the cutting blade 4 through the collar-shaped portion 3.
Can be easily grasped, and the cutting blade 4 can be easily replaced even when the cutting blade 4 generates heat. Further, the brim-shaped portion 3 has a flange type shape. Therefore, the brim portion 3 itself has a good cooling property.

[0021]

Since the present invention is constructed and functions as described above, according to this, since the horn tip portion 7A is covered with the rubber cover as a member having low thermal conductivity in a state where the cutting blade penetrates, The heat generated by the vibration of the tip of the horn is effectively blocked by the rubber cover. Therefore, an operator or the like can easily touch the tip of the horn through the rubber cover. Therefore, the exchanging work at the time of exchanging the cutting edge is facilitated, and the workability in the cutting work is improved.
In addition, cutting dust and the like flying from the cut object during the cutting operation is blocked by the rubber cover and does not enter the groove for attaching the cutting blade at the tip of the horn. That is, in other words, it is possible to effectively prevent a state in which cutting dust or the like enters the groove portion and accumulates therein. Therefore, the weight of the tip of the horn can be kept constant, and the resonance point at the time of design does not change. Therefore, stable and uniform vibration of the tip of the horn can be maintained for a long time, and the operator can keep the same vibration. It is possible to provide an unprecedented excellent ultrasonic cutter in which workability at the time of cutting is improved.

[Brief description of drawings]

FIG. 1 is a transverse cross-sectional view of an ultrasonic cutter according to the present embodiment with a part thereof omitted.

2 to 3 are enlarged views for explaining the tip portion of the horn shown in FIG.

4 to 5 are diagrams illustrating a second embodiment of the present invention.

6 to 7 are diagrams illustrating a conventional example.

[Explanation of symbols]

 1 Ultrasonic cutter 2 Rubber cover as a member with low thermal conductivity 3 Collar member 4 Cutting blade 7 Horn 7A Tip

Claims (2)

[Claims] 1. A horn having a groove for mounting a cutting blade at its tip and vibrating by vibrating force from an ultrasonic generator, and a cutting blade detachably mounted in the groove of the horn. An ultrasonic cutter characterized in that the tip of the horn is covered with a member having low thermal conductivity in a state where the cutting blade penetrates. 2. A horn having a groove for mounting a cutting blade at its tip end, which vibrates by vibrating force from an ultrasonic generator, and a cutting blade detachably mounted in the groove of the horn. An ultrasonic cutter, wherein a brim-shaped member corresponding to the tip of the horn is attached to a predetermined position of the cutting blade in a state where the cutting blade penetrates.