JP2001321388A - Ultrasonic surgical tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of complicating a cooling structure of an ultrasonic vibrator, in an ultrasonic surgical tool. SOLUTION: Radiation fins 72 are formed on the surface of a hand piece 50 to ensure large surface area. Heat from the ultrasonic vibrator 70 enclosed in the hand piece 50 is transmitted from the inside of a case 64 to the outside and further transmitted from the bottom part of the radiation fin 72 to the top part. In heat conduction along the radiation fin 72, heat is radiated from the side surface of the radiation fin 72 to the outside air, so that the temperature rise of the top part of the radiation fin 72 is suppressed to enable a surgeon to grip the hand piece 50 with a bare hand.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic surgical device, and more particularly to cooling of a handpiece in which an ultrasonic vibrator is built.

[0002]

2. Description of the Related Art An ultrasonic surgical instrument performs incision, crushing, and the like of tissue using ultrasonic vibration, and is used in various surgical operations.

FIG. 4 is a schematic sectional view of a handpiece of a conventional ultrasonic surgical instrument. An ultrasonic oscillator 12 is built in the handpiece 10, and the ultrasonic vibration generated by the ultrasonic oscillator 12 is transmitted to the distal end to crush the tissue.

[0004] Ultrasonic vibrator 1 used in ultrasonic surgical instruments
2 requires a high output, and as a result, the amount of heat generated also increases. In order to protect the ultrasonic vibrator 12 from this heat generation and to lower the surface temperature of the handpiece 10 so that the operator can hold it, a cooling water flow passage is formed inside the handpiece 10.

Conventionally, a double pipe structure in which a partition wall 16 is provided in a space between the case 14 of the handpiece 10 and the ultrasonic transducer 12 has been adopted. In this configuration, an outer gap 18 formed between the partition wall 16 and the case 14 is formed.
The cooling water is circulated between the partition wall 16 and the inner gap 20 formed between the ultrasonic transducer 12. For example, cooling water is injected into the outer gap 18 from a cooling water injection port 22 provided at the rear end of the handpiece 10. The injected cooling water flows toward the tip of the handpiece, flows into the inner gap via the communicating portion 24 between the outer gap 18 and the inner gap 20 provided on the tip, and flows into the surface of the ultrasonic transducer 12. The water flows toward the rear end of the handpiece while being in contact therewith, and is discharged from the cooling water discharge port 26.

[0006]

In a conventional configuration in which a cooling water flow passage is provided inside a handpiece, it is necessary to form a cooling water flow passage by combining a plurality of components. In particular, a relatively large number of parts and a complicated structure are required for reliable sealing, and there has been a problem that assembly is troublesome.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide an ultrasonic surgical device capable of cooling an ultrasonic vibrator with a simple structure.

[0008]

An ultrasonic surgical instrument according to the present invention has an air cooling structure in which a handpiece radiates heat transmitted from the ultrasonic vibrator.

According to the present invention, as an air-cooled structure, heat is transmitted from an ultrasonic vibrator, and has a large surface area for effectively dissipating the heat, and the outside air in contact with the surface can be efficiently replaced. Possible structures are formed on or within the surface of the handpiece.

In an ultrasonic surgical instrument according to a preferred aspect of the present invention, the air cooling structure is a plurality of fins erected on the surface of the handpiece.

In the ultrasonic surgical instrument according to the present invention, the fin has a shape that makes a round in the circumferential direction of the handpiece.

According to the present invention, for example, if the handpiece is cylindrical, the fins are formed in a ring shape. By providing the fins in this direction, a function as an anti-slip in the axial direction of the handpiece is obtained.

[0013] In the ultrasonic surgical instrument according to the present invention, the fin has a form in which the temperature at the top is equal to or lower than a predetermined value.

The heat transmitted from the ultrasonic transducer to the base of the fin is radiated from the side surface of the fin to the outside air. According to the present invention, the heat dissipation releases conduction heat to the tops of the fins, and factors such as the height, surface area, and spacing of the fins are determined so that the temperature at the tops becomes a predetermined value or less. The predetermined value set as the temperature at the top is, for example,
The temperature at which human skin can touch.

In the ultrasonic surgical instrument according to the present invention, the gap between the fins is sized to prevent a finger of an operator's hand from entering the gap.

According to the present invention, the distance between the fins is set so that the operator's skin is prevented from touching the surface of the relatively hot handpiece located between the fins.

In the ultrasonic surgical instrument according to the present invention, the air-cooling structure is provided on a grip portion of the handpiece.

According to the present invention, an air-cooling structure such as a fin is arranged on a grip portion held by a user of the ultrasonic surgical instrument. Normally, this part has an ultrasonic transducer inside,
This is a portion where the temperature is likely to rise due to the generated heat, and also a portion that is gripped by the user. By arranging an air cooling structure in this portion, the cooling of the portion is efficiently performed, and the temperature is set to a temperature that can be gripped by the user.

[0019]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view schematically showing the appearance of an ultrasonic surgical instrument according to an embodiment of the present invention. The handpiece 50 includes a grip section 52 and a horn section 54. The grip portion 52 is a portion that incorporates an ultrasonic vibrator therein and is gripped by an operator when using the ultrasonic surgical instrument. The horn part 54 includes a horn 54A for transmitting the ultrasonic waves generated by the ultrasonic transducer, and a horn cover 54B for covering the horn. Horn cover 5
The distal end portion 54C of the horn 54A is exposed from the distal end of 4B, and the distal end portion 54C forms an action portion for tissue.

A gap is provided between the horn cover 54B and the horn 54A. Wash water tube 6
From 0, irrigation water for cooling and irrigation of the tissue is supplied,
Cleaning water is poured into the affected part from the opening at the tip of the horn cover 54B. On the other hand, the washing water poured into the affected part is sucked together with the crushed tissue from the distal end opening of the hollow horn 54A.

From the rear end of the grip portion 52, a signal cable 62 to the ultrasonic vibrator and a cleaning liquid suction tube are drawn out and connected to a vibrator driving unit and a pump, respectively.

FIG. 2 is a schematic cross-sectional view of the grip portion 52 on a plane passing through the axis of the handpiece 50. An electrostrictive or magnetostrictive ultrasonic vibrator 70 is built in a case 64 constituting the grip portion 52, and a horn 54A is connected to an end on the distal end side.

The main feature of the present ultrasonic surgical instrument is that the heat generated from the ultrasonic vibrator 70 is radiated to cool the ultrasonic vibrator 70 and the handpiece 50. As a cooling structure, a radiation fin 72 is provided upright on the outer surface of the case 64. The heat radiation fins 72 have a ring shape, and are provided in plural at predetermined intervals along the axis of the handpiece 50. The radiation fins 72 can be formed integrally with the case 64 by, for example, die cutting or cutting.

The height, thickness, and spacing of the radiation fins 72 are determined in consideration of the amount of heat generated by the ultrasonic vibrator 70 and the material of the radiation fins 72 so that a desired cooling effect can be obtained, for example, at room temperature in the operating room. Designed to. For example, the radiating fins 72 are configured to keep the tops in a temperature range where the operator can touch them with bare hands.

The distance between the radiation fins 72 is as follows.
On the one hand, more radiating fins 72
In order to secure the heat radiation area by being erected on the side surface of No. 0, the interval between the heat radiation fins 72 is reduced. On the other hand, the radiation fins 72
It is considered that it is not preferable that the space between the radiation fins 72 is too small in order for the outside air to satisfactorily flow through the gap and perform air cooling. Further, even when the cooling fins 72 are arranged at a wide interval and sufficient air cooling is performed,
In order to prevent the operator's finger holding the grip portion 52 from entering between the heat radiation fins 72 and touching a portion having a higher temperature than the top, the heat radiation fins 72, which are unnecessary for air cooling, are narrow. The radiation fins 72 are arranged at intervals. As a material of the radiation fins 72, for example, a metal such as aluminum is used. Also, the radiation fins 7
The height and interval of 2 are set to several mm, for example.

Incidentally, since the ultrasonic vibrator 70 can be formed thinner, the outer diameter of the case 64 can be increased by providing the heat radiation fins 72.
The thickness can be held so that the operator can hold it with one hand.

Irregularities are formed on the surface of the grip portion 52 by the heat radiation fins 72, and the irregularities serve as a non-slip function when grasped by an operator.

The shape of the radiation fins 72 may be various other shapes. FIGS. 3A and 3B are schematic views of the handpiece 50 having the radiation fins 80 having other shapes. FIG. 3A is a side view, and FIG. 3B is a cross-sectional view orthogonal to the axis of the handpiece 50. is there. In this configuration, the radiation fin 80 has a shape extending in a direction parallel to the axis of the handpiece 50.

As another radiating fin, a ring shape that periodically undulates in the circumferential direction can be employed. By bending the heat radiation fins, the surface area thereof becomes larger than that of the heat radiation fins 72 having a flat ring shape. Also,
Such a gap formed by arranging the radiating fins in parallel can suppress entry of the operator's finger.

Further, the radiation fins may be provided spirally along the surface of the handpiece 50. In addition, by rounding or chamfering the top surface of the radiating fin to reduce the corner, the operator can grip the handpiece 50 firmly and can reduce fatigue even when used for a long time. .

The air cooling structure may be, for example, a porous structure in addition to the fins described above.
This porous structure allows the outside air to flow inside, and the surface of the handpiece 50 is constituted by this layer.

[0033]

According to the ultrasonic surgical instrument of the present invention, an air-cooling structure such as a radiation fin is provided on the surface of the handpiece, so that the heat generated by the ultrasonic transducer is radiated. According to the present invention, since a special refrigerant such as cooling water is not used, there is no need to provide the flow passage inside the handpiece. Further, the structure is simple.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing the appearance of an ultrasonic surgical instrument according to an embodiment of the present invention.

FIG. 2 is a schematic sectional view of a grip portion of the handpiece.

FIG. 3 is a schematic view of a handpiece having a radiation fin of another shape. It is a schematic diagram which shows a part of cross section of the handpiece in the surface which intersects the axis | shaft of a grip part.

FIG. 4 is a schematic cross-sectional view of a handpiece of a conventional ultrasonic surgical instrument.

[Explanation of symbols]

50 handpiece, 52 grip, 54 horn, 64 case, 70 ultrasonic transducer, 72, 80
Radiation fins.

Continued on the front page (72) Inventor Gen Ogura 6-22-1, Mure, Mitaka-shi, Tokyo Aloka Co., Ltd. (72) Inventor Shigeru Hanaoka 6-22-1, Mure, Mitaka-shi, Tokyo F-term in Aloka Co., Ltd. (Reference) 4C060 EE04 JJ23

Claims (6)

[Claims] 1. An ultrasonic surgical device having a handpiece having a built-in ultrasonic vibrator, wherein the handpiece has an air cooling structure for radiating heat transmitted from the ultrasonic vibrator. Surgical instrument. 2. The ultrasonic surgical device according to claim 1, wherein the air cooling structure is a plurality of fins erected on the surface of the handpiece. 3. The ultrasonic surgical device according to claim 2, wherein the fin has a shape that makes a round in a circumferential direction of the handpiece. 4. The ultrasonic surgical device according to claim 2, wherein the fin has a form in which the temperature at the top is equal to or lower than a predetermined value. 5. The ultrasonic surgical instrument according to claim 2, wherein the gap between the fins is large enough to prevent a finger of an operator's hand from entering the gap. An ultrasonic surgical instrument characterized by the following. 6. The ultrasonic surgical device according to claim 1, wherein the air cooling structure is provided on a grip portion of the handpiece.