JP2003230567A - Ultrasonic treating instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ultrasonic treating instrument which keeps the bending rigidity from lowering while securing necessary amplitude expansion rates. <P>SOLUTION: In the ultrasonic treating instrument, a cut part 41 which is provided being positioned on the side vertical to a plane defined by a long axis of a vibration transmission member 34 and the direction of a load F applied on a treating part 29 at least at a part of the vibration transmission member 34 that has the tip treating part 29 adapted to perform ultrasonic treatments in contact with living tissues. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic treatment instrument for performing treatment such as incision and coagulation of biological tissue by ultrasonic vibration during surgical operation.

[0002]

2. Description of the Related Art Ultrasonic treatment tools for performing incision / coagulation of living tissue by ultrasonic vibration during surgical operation are generally known. As disclosed in Japanese Unexamined Patent Publication No. 2000-254136, a general ultrasonic treatment tool expands the amplitude of ultrasonic vibration generated by an ultrasonic transducer to an amplitude necessary for treatment, and therefore a probe that transmits ultrasonic vibration. There is a horn on the way.

[0003]

In the conventional ultrasonic treatment tools, a horn is provided in the middle of the probe. Conventional horns, such as a conical type and an exponential type, all have a circular cross section, but the area is reduced. It had a shaped shape.

In recent years, it has been desired to reduce the diameter of the treatment instrument. Therefore, if the diameter of the treatment instrument is reduced, the probe is also reduced, and if the diameter in the middle of the probe is further reduced in order to increase the amplitude, the bending of the probe is caused. The rigidity will decrease. Therefore, it has been found that the probe bends significantly when a load is applied to the tip of the probe during the treatment with the ultrasonic treatment tool, and problems such as interference with other parts occur.

Further, when the size of the treatment tool is to be reduced for minimally invasiveness, the shape of the probe is determined in the space determined by the combination with other parts, and the amplitude is increased.
There was also a situation in which the amplitude required for treatment could not be obtained.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an ultrasonic treatment tool in which the flexural rigidity of a probe is not lowered while securing a necessary amplitude expansion rate. is there.

[0007]

The invention according to claim 1 is
A vibrator that generates ultrasonic vibrations, a vibration transmission member that transmits the ultrasonic vibrations generated by the vibrator, and a tip treatment that is provided at the tip of the vibration transmission member and that performs ultrasonic treatment in contact with living tissue. An ultrasonic treatment instrument including a cutout portion at least at a part of the vibration transmission member, the cutout portion being located in a direction perpendicular to a plane defined by a longitudinal axis of the vibration transmission member and a load direction applied to the treatment portion. Is provided.

The invention according to claim 2 is characterized in that the notch is provided between the vibration node on the most proximal side and the vibration node on the most distal side of the vibration transmitting member. The ultrasonic treatment device according to claim 1.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An ultrasonic treatment tool according to an embodiment of the present invention will be described below with reference to the drawings.

(Structure) As shown in FIG. 1A, an ultrasonic treatment tool 1 includes a handpiece 2 having an ultrasonic vibrator (not shown) for generating ultrasonic vibration therein, and a treatment piece. Probe 3 and a sheath 4 that covers the probe 3. A power supply cord 5 is connected to the rear end of the handpiece 2 so as to extend in a coaxial direction.

As shown in FIG. 1B, a holding member unit 13 having a C ring 12 as a lock receiving portion assembled therein is fastened and fixed to the tip of a casing 11 of the handpiece 2. The holding member unit 13 is the casing 1
It is screwed into the tip of the casing 1 and is fixedly connected to the casing 11.

The sheath 4 is composed of a pipe-shaped insertion portion 15 that covers the probe 3 and a main body portion 16 that also serves as a base portion thereof, and the insertion portion 15 and the main body portion 16 are connected via a connecting member 17. The main body portion 16 and the connecting member 17 are screw-coupled to each other by a female screw portion 18 and a male screw portion 19 provided at respective fitting portions. The main body 16 and the connecting member 1
7 may be connected by adhesion.

The insertion portion 15 of the sheath 4 has a double pipe structure. A hard pipe member 21 made of metal such as stainless steel is arranged on the outer side, and a resin tube member 22 made of fluororesin or the like is arranged on the inner side. Arranged to form a straight tubular sheath having the same diameter. The resin tube member 22 forms a conduit having a diameter that allows the projection 23, which is the maximum diameter portion of the probe 3, to be inserted therethrough.

As shown in FIG. 1B, the resin tube member 22 extends to the base end side of the connecting member 17, and when the handpiece 2, the probe 3 and the sheath 4 are connected and assembled, the most of the probe 3 is obtained. It is arranged so as to surround at least a part of a region of the protrusion 24 provided on the base end side. Further, the base end side portion of the resin tube member 22 is formed as an enlarged portion 25 formed in a tapered shape so as to be larger than the inner diameter of the hard pipe member 21. The enlarged portion 25 is joined to the tapered opening surface 17a formed on the base end wall portion of the connecting member 17 and positioned.

The insertion portion 15 is coaxially arranged outside the probe 3 except for the treatment portion 29 formed at the tip of the probe 3, and is fixedly connected to the connecting member 17 by adhesion. Further, as shown in FIG. 1B, the insertion portion 15 is extended by a length that covers the vicinity of a proximal end portion of a treatment portion 29 described later.

As shown in FIG. 1B, the sheath 4 is
A mounting portion 26 that is detachably mounted to the holding member unit 13 of the handpiece 2 is configured at the base end portion of the body portion 16. The mounting portion 26 has an inner cylinder 27 attached to the base end portion of the main body 16, and the inner cylinder 27 is inserted into the inside of the holding member unit 13 on the handpiece 2 side. The inner cylinder 27 is tightly fitted to the inner peripheral surface of the holding member unit 13 and constitutes guide means for determining the mounting position of the sheath 4 on the handpiece 2. A fitting space into which the holding member unit 13 is fitted is formed between the proximal end portion of the main body 16 of the sheath 4 and the inner cylinder 27, and the holding member for the handpiece 2 is provided inside the fitting space. An engagement member 28 that engages with the C ring 12 of the unit 13 and positions and fixes the sheath 4 on the handpiece 2 is provided.

As shown in FIG. 1 (B), the probe 3 is connected to an ultrasonic transducer provided inside the handpiece 2. That is, the female screw 31 is attached to the output end 30 of the ultrasonic transducer installed on the handpiece 2.
Is formed, and the female screw 3 is formed on the proximal end portion of the probe 3.
1 and a removable male screw 32 is formed. Then, by screwing the female screw 31 and the male screw 32, the probe 3
Is connected to an ultrasonic transducer inside the handpiece 2.

The short range portion of the base of the vibration transmitting member 34 of the probe 3 has a diameter larger than that of the tip side portion of the probe 3, and is between the large diameter portion 35 and the tip side portion 36. A horn 37 is provided in the.
The horn 37 avoids the connecting member 17 and the body portion 1 of the sheath 4
6 are arranged in the internal space area. The portion of the horn 37 has a conical shape, an exponential shape, a Fourier shape, a step shape, or the like.
The cross-sectional shape of is circular.

The distal end portion of the probe 3 protruding and exposed from the distal end of the sheath 4 forms a treatment portion 29.
That is, the treatment portion 29 is in a form connected to the tip of the vibration transmitting member 34.

Further, as the treatment portion 29 of the probe 3,
As shown in each of FIGS. 2A and 2B, the shape is such that it can be easily treated according to the surgical technique. For example, as shown in FIG. 2 (A), a pole type, as shown in FIG. 2 (B), a spatula type, as shown in FIG. 2 (C), as shown in FIG. 2 (D). Various shapes such as a Nakama type, a hook type as shown in FIG. 2E, and a knife type as shown in FIG. 2F can be selected. In particular, the treatment section 29 of the type shown in FIGS. 2C to 2F is provided with an ultrasonic wave emitting surface 39.

The length of the probe 3 is a specific length that produces a standing wave at the driving frequency. In the vibration transmitting member 34 of the probe 3, the vibration transmitting member 3
4 are provided with protrusions 23 and 24 that swell in the radial direction. The protrusion 23 may be made of a silicone rubber lining.

Further, a pair of notches 41 are provided in the middle of the vibration transmitting member 34 of the probe 3. The cross-sectional shape of the cutout portion 41 taken along the line AA shown in FIG. 1B is as shown in FIG. 3, and it depends on the load F applied to the treatment portion 29 and the longitudinal axis L of the probe 3. It is formed so as to have a narrow width and a flat shape in the direction perpendicular to the defined plane. In other words, the notches 41 are formed at two symmetrical positions located in the direction perpendicular to the plane defined by the longitudinal axis L of the vibration transmitting member 34 and the direction of the load F applied to the treatment portion 29.

The notch 41 is provided between the vibration node on the most proximal side and the vibration node on the most distal side of the vibration transmitting member 34. In this embodiment, the oscillating node on the most distal side is located on the projection 23, and the oscillating node on the most proximal side is the projection 24.
It is in. Further, the cross-sectional shapes of the front and rear end portions of the cutout portion 41 are arcuate, and therefore, the abrupt change of the cross-sectional area of the vibration transmission member 34 is alleviated, and the ultrasonic vibration transmission efficiency is improved.

A gripping portion 43 is provided on the outer periphery of the main body 16 so as to prevent the operator from slipping when held by the operator.

(Operation) In the ultrasonic treatment instrument according to the present embodiment, when the handpiece 2, the probe 3 and the sheath 4 are assembled, the protrusions 23 and 24 do not interfere with the insertion portion 15 except the vibrating node. Thus, the probe 3 is positioned. In addition, the protrusion 2 that is a vibrating node of the probe 3
Reference numerals 3 and 24 correspond to the sheath 4 arranged on the outer periphery of the sheath 3, which restricts the radial movement of the probe 3. Also,
The resin tube member 22 is fixed so as not to move in the distal direction of the hard pipe member 21 by the enlarged portion 25 formed at the base end.

The ultrasonic vibration generated by the vibrator in the handpiece 2 is transmitted to the treatment portion 29 through the large diameter portion 35 of the probe 3, the horn 37, and the vibration transmission member 34 and used for treatment. At this time, the amplitude of the ultrasonic vibration is enlarged by the horn 37 and the notch 41 where the cross-sectional area of the probe 3 is changing.

(Effect) In the probe 3 having the length of one wavelength of the driving frequency, only the protrusions 23 and 24 of the two vibrating nodes are in contact with the inner surface of the sheath 4 and the movement in the radial direction is fixed to fix the treatment portion. The load F applied to 29 prevents the probe 3 from bending and causing unintended interference with the sheath 4. In the enlarged portion 25, the resin tube member 22 is the sheath 4
It is blocked from falling off from the tip side.

Further, the notch portion 41 is cut in a direction perpendicular to the direction of the load F applied to the treatment portion 29 to reduce the cross-sectional area of the probe 3, thereby expanding the necessary vibration amplitude which cannot be obtained by the horn 37 alone. Moreover, it is possible to suppress a decrease in bending rigidity in the direction of the load F. That is, even if the cross-sectional area of the probe 3 is reduced to increase the amplitude, it is possible to suppress the decrease in bending rigidity in the load direction.

The present invention is not limited to the above-mentioned embodiment, but can be applied to other forms.

[0030]

As described above, according to the present invention, the vibration amplitude can be increased without lowering the bending rigidity of the probe. That is, it is possible to suppress the decrease in bending rigidity of the probe while expanding the ultrasonic vibration generated in the vibrator to the amplitude necessary for the treatment. Therefore, the diameter of the probe can be reduced. Further, since the diameter of the probe can be reduced, the effect that the probe can prevent interference with other components can be obtained.

[Brief description of drawings]

FIG. 1A is an external side view of an ultrasonic treatment instrument according to an embodiment of the present invention, and FIG. 1B is a partial vertical cross-sectional view of the ultrasonic treatment instrument.

2 (A), (B), (C), (D), (E), and (F) show various examples of a treatment section of an ultrasonic treatment instrument, respectively, and (C).
The right side of the partial drawings of (D) and (F) is a side view of the treatment section, and the left side is a longitudinal sectional view of the treatment section.

FIG. 3 is a vertical cross-sectional view of a cutout portion formed in the middle of a vibration transmission member in the probe of the ultrasonic treatment tool.

[Explanation of symbols]

F ... load 1 ... Ultrasonic treatment tool 2 ... Handpiece 3 ... probe 4 ... Sheath 11 ... Casing 15 ... insertion part 16 ... Main body 21 ... Hard pipe member 22 ... Resin tube member 29 ... Treatment department 34 ... Vibration transmitting member 37 ... Horn 39 ... Radiating surface 41 ... Notch

Claims (2)

[Claims] 1. A vibrator for generating ultrasonic vibrations, a vibration transmitting member for transmitting the ultrasonic vibrations generated by the vibrator, and an ultrasonic wave which is provided at the tip of the vibration transmitting member and comes into contact with living tissue. In an ultrasonic treatment instrument including a distal treatment section for performing treatment, at least a part of the vibration transmission member is positioned in a direction perpendicular to a plane defined by a longitudinal axis of the vibration transmission member and a load direction applied to the treatment section. An ultrasonic treatment tool characterized in that a notch is provided at a location. 2. The cutout portion is provided so as to be located between the most proximal vibration node and the most distal vibration node of the vibration transmitting member. Ultrasonic treatment tool.