JP2021122305A - Medical treatment instrument - Google Patents

Abstract

To provide a medical treatment instrument that can achieve reduction in weight and size while maintaining rigidity.SOLUTION: There is provided a medical treatment instrument equipped with a first arm and a second arm, each of which has a first end part and a second end part, the first end parts being connected to each other so that the distance between the second end parts can be adjusted. The first arm and the second arm respectively include a conductor extending from the first end part to the second end part, a support body whose main component is a composite material of resin and a reinforcement material, extending along the conductor, and a cover for coating the conductor and the support body. The conductor includes a conductive part coated by the cover together with the support body, and a tip part electrically connected to the conductive part, which is exposed at the second end part. The tip part includes a convexoconcave that comes in contact with at least one of the support body and the cover.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to medical treatment tools.

There is known a medical treatment tool that incises or coagulates a living tissue by applying a high frequency voltage to the living tissue to be treated. As one kind of such medical treatment tool, there is a bipolar tweezers that applies a voltage to two points of action in the object to be treated (see Patent Document 1).

Japanese Unexamined Patent Publication No. 2006-288425

Conventional bipolar tweezers are relatively heavy because the skeleton of the arm (that is, the grip portion) is made of metal that also serves as a conductor. Further, since the arm is formed to have a constant size in order to maintain rigidity, it may be difficult for the arm to be gripped depending on the size of the user's hand. As described above, the conventional bipolar tweezers impose a heavy burden on the user.

One aspect of the present disclosure is to provide a medical treatment tool that can be reduced in weight and size while maintaining rigidity.

One aspect of the present disclosure is a first arm and a first arm that have a first end and a second end, respectively, and the first ends are connected to each other so that the distance between the second ends can be adjusted. It is a medical treatment tool equipped with two arms.

The first arm and the second arm are each composed of a conductor extending from the first end portion to the second end portion and a composite material of a resin and a reinforcing material as main components, and a support extending along the conductor. It has a cover that covers the conductor and the support. The conductor has a conductive portion covered with a cover together with a support, and a tip portion that is electrically connected to the conductive portion and is exposed at the second end portion. The tip has an uneven portion that comes into contact with at least one of the support and the cover.

According to such a configuration, the first arm and the second arm are reduced in weight and size by supporting the conductor by a support made of a composite material. In addition, the cover can increase the degree of freedom in designing the color, shape, etc. of the medical treatment tool. Further, since the tip portion of the conductor has an uneven portion, the joint strength between the tip portion and the support or the cover can be increased. As a result, it is possible to suppress the detachment of the tip portion from the support or the cover while reducing the weight and size of the first arm and the second arm.

In one aspect of the present disclosure, the tip portion may have a notch recessed as an uneven portion in a direction intersecting the extending direction of the conductor. According to such a configuration, the notch is filled with a part of the support or the cover, so that the tip portion can be more accurately suppressed from being detached from the support or the cover.

In one aspect of the present disclosure, the tip may have a rough surface joined to at least one of a support and a cover as an uneven portion. According to such a configuration, since the joint area between the tip portion and the support or cover is increased, the tip portion can be more accurately suppressed from being detached from the support or cover.

In one aspect of the present disclosure, the conductive portion may be a plate material having a through hole filled with at least one part of a support and a cover. According to such a configuration, the joint strength between the conductor and the support or the cover can be increased while reducing the thickness of the first arm and the second arm.

FIG. 1 is a schematic view of the medical treatment tool of the embodiment. FIG. 2 is a schematic front view of the first arm in the medical treatment tool of FIG. 3A is a schematic cross-sectional view taken along the line IIIA-IIIA of FIG. 2, FIG. 3B is a schematic cross-sectional view taken along the line IIIB-IIIB of FIG. 2, and FIG. 3C is a schematic cross-sectional view taken along the line IIIB-IIIB of FIG. FIG. 3 is a schematic cross-sectional view taken along the line −IIIC. 4A is a schematic front view of the tip of the medical treatment tool of FIG. 1, FIG. 4B is a schematic plan view of the tip of FIG. 4A, and FIG. 4C is the tip of FIG. 4A. It is a schematic side view of. 5A is a schematic front view of the tip portion in an embodiment different from FIG. 4A, FIG. 5B is a schematic plan view of the tip portion of FIG. 5A, and FIG. 5C is a tip portion of FIG. 5A. It is a schematic side view of. 6A is a schematic front view of the tip portion in an embodiment different from FIGS. 4A and 5A, FIG. 6B is a schematic plan view of the tip portion of FIG. 6A, and FIG. 6C is FIG. 6A. It is a schematic side view of the tip part of.

Hereinafter, embodiments to which the present disclosure has been applied will be described with reference to the drawings.
[1. First Embodiment]
[1-1. composition]
The medical treatment tool 1 shown in FIG. 1 is a treatment tool for incising, coagulating, and the like of a living tissue by a high frequency voltage.

The medical treatment tool 1 includes a first arm 2, a second arm 3, a connecting portion 4, a cord 5, and a plug 6. The medical treatment tool 1 is an electric knife (so-called bipolar tweezers) having a bipolar electrode.

<Arm>
The first arm 2 is a plate-shaped or rod-shaped member having a first end portion 2A and a second end portion 2B and extending from the first end portion 2A to the second end portion 2B. Similarly, the second arm 3 is a plate-shaped or rod-shaped member having a first end portion 3A and a second end portion 3B and extending from the first end portion 3A to the second end portion 3B.

In the first arm 2 and the second arm 3, the first end portions 2A and 3A are connected to each other by a connecting portion 4 so that the distance between the second end portions 2B and 3B can be adjusted. That is, the first arm 2 and the second arm 3 form tweezers that open and close with the connecting portion 4 as a fulcrum.

The second end 2B of the first arm 2 and the second end 3B of the second arm 3 are separated from each other when not in use and close to each other when in use (ie, when the procedure is performed).

(1st arm)
As shown in FIG. 2, the first arm 2 has a conductor 21, a support 22, and a cover 23.

(conductor)
The conductor 21 is a member that extends from the first end portion 2A of the first arm 2 to the second end portion 2B. A current is supplied to the conductor 21 from a cord 5 described later. The conductor 21 has a conductive portion 21A and a tip portion 21B.

As shown in FIG. 3A, the conductive portion 21A is a plate-shaped member supported by a support 22 described later. As shown in FIG. 2, the conductive portion 21A has a through hole 21C in which a part of the support 22 is filled. The through hole 21C penetrates the conductive portion 21A in the thickness direction.

The conductive portion 21A extends in the longitudinal direction of the first arm 2 so as to connect the cord 5 and the tip portion 21B. Further, the entire conductive portion 21A is covered with the cover 23, which will be described later, together with the support 22. Therefore, the conductive portion 21A is not exposed in the first arm 2 and is not visible from the outside.

The tip portion 21B is electrically connected to the conductive portion 21A at an end portion of the conductive portion 21A near the second end portion 2B. Further, the tip portion 21B is exposed at the second end portion 2B of the first arm 2.

As shown in FIGS. 4A, 4B, and 4C, the tip portion 21B has a treatment portion 211, a connection portion 212, a first uneven portion 213, and a second uneven portion 214. In FIGS. 4A, 4B, and 4C, "front" refers to the direction approaching the second end portion 2B, and "rear" refers to the direction approaching the first end portion 2A. Further, "left" refers to a direction approaching the second arm 3, and "right" refers to a direction away from the second arm 3. "Upper" is the direction upward when the medical treatment tool 1 is used, and "lower" is the direction upward when the medical treatment tool 1 is used.

The treatment unit 211 is a portion that comes into contact with the living tissue and constitutes an action point to which a high frequency voltage is applied. The treatment portion 211 is located at the second end portion 2B. The treatment portion 211 is not covered with the support 22 and the cover 23, and is exposed.

The treatment unit 211 of the first arm 2 and the treatment unit 211 of the second arm 3 perform functions such as pinching and cutting. The treatment portion 211 of the present embodiment has a needle-like shape that becomes thinner toward the tip (that is, the cross-sectional area perpendicular to the longitudinal direction becomes smaller).

The connecting portion 212 is a portion connected to the conductive portion 21A. The connecting portion 212 is connected to the end portion on the side opposite to the tip end of the treatment portion 211 (that is, the side closer to the conductive portion 21A). The connecting portion 212 has a columnar shape whose width decreases toward the treatment portion 211.

At least a part of the outer surface of the connecting portion 212 is covered with the support 22 and the cover 23. As shown in FIG. 3B, in the present embodiment, the surface of the connecting portion 212 on the side opposite to the second arm 3 is covered by the support 22, and the outer surface of the support 22 is covered by the cover 23. .. Further, the surface of the connecting portion 212 facing the second arm 3 is exposed without being covered with the support 22 and the cover 23.

The connecting portion 212 is joined to the conductive portion 21A by, for example, soldering, welding, or the like. Further, the connecting portion 212 may be mechanically connected to the conductive portion 21A. Further, the conductive portion 21A and the tip portion 21B may be integrally formed. That is, the connecting portion 212 may extend from the conductive portion 21A, and the treatment portion 211 may further extend from the connecting portion 212.

The first uneven portion 213 is a notch recessed in a direction intersecting the extending direction of the conductor 21 (that is, the longitudinal direction of the first arm 2). The first uneven portion 213 is formed by a constriction at the connecting portion between the treatment portion 211 and the connecting portion 212.

The width (that is, thickness) of the treatment portion 211 and the connection portion 212 in the opposite direction of the first arm 2 and the second arm 3 increases as the first uneven portion 213 approaches. That is, the thickness of the treatment portion 211 at the connecting end with the connection portion 212 is larger than the thickness at the other portion of the treatment portion 211. Further, the thickness at the tip of the connecting portion 212 is larger than the thickness at other portions of the connecting portion 212. As a result, it is possible to prevent the tip portion 21B from breaking at the first uneven portion 213.

The second uneven portion 214 is a rough surface joined to the support 22 that covers the connecting portion 212. The second uneven portion 214 is provided on the surface of the connecting portion 212.

The second uneven portion 214 is formed by ridges or grooves arranged parallel to each other, ridges or grooves arranged to intersect each other, minute concave portions or protrusions arranged apart from each other, and a combination thereof. It is composed.

As the material of the conductive portion 21A and the tip portion 21B, for example, metals such as copper, gold, aluminum, platinum, molybdenum, nickel, tungsten, chromium, and titanium can be used. The tip 21B may be plated with a precious metal. Further, the material may be changed between the conductive portion 21A and the tip portion 21B.

(Support)
The support 22 is a layer containing a composite material (so-called reinforced plastic) of a resin (that is, a matrix) and a reinforcing material as a main component. Here, the "main component" is a component contained in an amount of 90% by mass or more.

The resin used for the composite material is not particularly limited, and a thermosetting resin or a thermoplastic resin can be used. Examples of the reinforcing material used for the composite material include fibers and granules. Examples of the fiber used for the composite material include glass fiber and carbon fiber. Examples of the shape of the granules include spheres, polyhedra, and cylinders.

The support 22 extends from the first end 2A toward the second end 2B along the conductor 21. The support 22 may be divided into a plurality of portions in the longitudinal direction of the first arm 2. That is, the first arm 2 may have a region in which the support 22 does not exist in a portion other than the second end portion 2B.

In the present embodiment, as shown in FIG. 3A, the support 22 is arranged so as to be overlapped with the surface of the conductive portion 21A of the conductor 21, and is in contact with the surface of the conductive portion 21A. The support 22 covers a part of the surface of the conductive portion 21A in the circumferential direction.

The support 22 is arranged on the side opposite to the second arm 3 (that is, the side in the direction in which the tweezers open) with respect to the conductor 21. Further, as shown in FIG. 3C, a part of the support 22 has penetrated into the through hole 21C of the conductive portion 21A.

A part of the support 22 covers the connecting portion 212 of the tip portion 21B. The support 22 is in contact with the first uneven portion 213 and the second uneven portion 214 of the tip portion 21B. In other words, the support 22 is filled with a notch or a step forming the first uneven portion 213 and a concave portion forming the second uneven portion 214.

The support 22 of the present embodiment is covered with a cover 23 described later. Therefore, the support 22 does not come into contact with the living tissue.

(cover)
The cover 23 is a member that covers the conductor 21 and the support 22. The cover 23 constitutes a grip portion to be gripped by the user.

The cover 23 covers the entire support 22 and a portion of the conductor 21 other than the treatment portion 211 of the tip portion 21B. That is, a part of the connecting portion 212 of the tip portion 21B is covered with the cover 23 via the support 22.

The material of the cover 23 is not particularly limited. The cover 23 may contain, for example, a resin such as polyamide, polyethylene, or polyetheretherketone (PEEK) as a main component. By providing the cover 23 with insulating properties (that is, the cover 23 contains an insulating resin as a main component), a composite material containing a conductive reinforcing material (for example, fiber reinforcing containing carbon fibers such as carbon nanotubes) is provided. The support 22 can be formed of plastic).

By using an insulating resin as the main component of the cover 23, the weight of the first arm 2 can be further reduced. Further, since the cover 23 can be easily molded, the productivity of the first arm 2 is improved.

(2nd arm)
The second arm 3 has a conductor 21, a support 22, and a cover 23 similar to those of the first arm 2. However, in the second arm 3, the support 22 is arranged on the side opposite to the first arm 2 with respect to the conductor 21.

That is, the shape of the second arm 3 is perpendicular to the opposite direction of the first arm 2 and the second arm 3, and the distances from the tip portions 21B of the first arm 2 and the second arm 3 are equal to each other. The shape is symmetrical to that of the first arm 2 with reference to (see FIG. 1).

(Production method)
The first arm 2 and the second arm 3 can be manufactured, for example, by the following procedure. First, the composite material sheet constituting the support 22 is superposed on the conductor 21 in which the conductive portion 21A and the tip portion 21B are connected.

Next, the two resin sheets constituting the cover 23 are overlapped so as to sandwich the conductor 21 and the composite material sheet. The first arm 2 and the second arm 3 are obtained by crimping each member while heating the laminated body.

Further, a joint body of the conductor 21 and the support 22 may be produced, and the joint body may be covered with the cover 23. Specific methods of coating with the cover 23 include spraying resin on the joint, insert molding of resin on the joint, coating of the shrinkable tube on the joint, and the like.

<Connecting part>
As shown in FIG. 1, the connecting portion 4 is attached to the first end portion 2A of the first arm 2 and the first end portion 3A of the second arm 3.

The connecting portion 4 constitutes a fulcrum of tweezers composed of the first arm 2 and the second arm 3. Further, the cord 5 is pulled into the connecting portion 4. The conductor 21 of the first arm 2 and the conductor 21 of the second arm 3 are insulated from each other in the connecting portion 4.

<Code>
The cord 5 is a bipolar cord having two electric wires. Each electric wire is electrically connected to the conductor 21 of the first arm 2 and the conductor 21 of the second arm 3, respectively, in the connecting portion 4.

<Insert plug>
The plug 6 is electrically connected to the cord 5. The plug 6 is connected to a high-frequency current generator (not shown).

The high-frequency current generated by the high-frequency current generator flows through the cord 5 to the conductor 21 of the first arm 2. The high-frequency current flowing through the conductor 21 of the first arm 2 flows from the tip portion 21B of the conductor 21 to the tip portion 21B of the conductor 21 of the second arm 3 via the biological tissue, and returns to the high-frequency current generator. A current may flow from the conductor 21 of the second arm 3 to the conductor 21 of the first arm 2.

[1-2. effect]
According to the embodiment described in detail above, the following effects can be obtained.
(1a) The first arm 2 and the second arm 3 are reduced in weight and size by supporting the conductor 21 by the support 22 made of the composite material. Further, the cover 23 can increase the degree of freedom in designing the color, shape, etc. of the medical treatment tool 1.
Further, since the tip portion 21B of the conductor 21 has the first uneven portion 213 and the second uneven portion 214, the joint strength between the tip portion 21B and the support 22 can be increased. As a result, it is possible to suppress the detachment of the tip portion 21B from the support 22 while reducing the weight and size of the first arm 2 and the second arm 3.

(1b) Since a part of the support 22 is filled in the notch of the first uneven portion 213, the tip portion 21B can be more accurately suppressed from being detached from the support 22.
(1c) Since the joint area between the tip portion 21B and the support 22 is increased by the second uneven portion 214, the tip portion 21B can be more accurately suppressed from being detached from the support 22.

(1d) Since the conductive portion 21A is a plate material having the through hole 21C, the joint strength between the conductor 21 and the support 22 can be increased while reducing the thickness of the first arm 2 and the second arm 3.

[2. Other embodiments]
Although the embodiments of the present disclosure have been described above, it goes without saying that the present disclosure is not limited to the above-described embodiments and can take various forms.

(2a) The shape of the tip portion 21B in the medical treatment tool 1 of the above embodiment is an example. For example, as shown in FIGS. 5A, 5B, and 5C, the tip portion 21B may have a plate-shaped treatment portion 211A having a constant width toward the tip. In the treatment portion 211A of FIG. 5A, the tip end is chamfered in an arc shape in a front view (that is, when viewed from the opposite direction of the first arm 2 and the second arm 3).

(2b) In the medical treatment tool 1 of the above embodiment, the tip portion 21B does not necessarily have to have both the first uneven portion 213 and the second uneven portion 214. That is, the tip portion 21B may have only one of the first uneven portion 213 and the second uneven portion 214.

Further, for example, as shown in FIGS. 6A, 6B, 6C, the tip portion 21B is added to the first uneven portion 213 and the second uneven portion 214, or is replaced with the first uneven portion 213 and the second uneven portion 214. The third uneven portion 215 and the fourth uneven portion 216 may be provided.

The third uneven portion 215 is a through hole provided in the connecting portion 212. The fourth uneven portion 216 is a slit recessed from the connection end of the connecting portion 212 with the conductive portion 21A toward the treatment portion 211. The third concavo-convex portion 215 and the fourth concavo-convex portion 216 are each filled with the support 22. In particular, since the support 22 is crimped to the connecting portion 212 in the fourth uneven portion 216, the joint strength between the support 22 and the connecting portion 212 is improved.

(2c) In the medical treatment tool 1 of the above embodiment, each uneven portion may come into contact with the cover 23 instead of contacting the support 22. Further, each uneven portion may come into contact with both the support 22 and the cover 23.

(2d) In the medical treatment tool 1 of the above embodiment, the through hole 21C may be filled with the cover 23. Further, the conductive portion 21A does not necessarily have to have the through hole 21C. Further, the conductive portion 21A is not necessarily limited to the plate material. That is, the conductive portion 21A may be a bar or a wire.

(2e) In the medical treatment tool 1 of the above embodiment, the support 22 of the first arm 2 does not necessarily have to be arranged on the side opposite to the second arm 3 with respect to the conductor 21. Similarly, the support 22 of the second arm 3 does not necessarily have to be arranged on the side opposite to the first arm 2 with respect to the conductor 21.

Further, the support 22 may cover the conductive portion 21A so as to wrap the entire circumference of the conductive portion 21A when viewed from the longitudinal direction. Further, the support 22 does not necessarily have to come into contact with the conductor 21. That is, another member (for example, a part of the cover 23) may be arranged between the support 22 and the conductor 21.

(2f) The functions of one component in the above embodiment may be dispersed as a plurality of components, or the functions of the plurality of components may be integrated into one component. Further, a part of the configuration of the above embodiment may be omitted. Further, at least a part of the configuration of the above embodiment may be added or replaced with the configuration of the other embodiment. It should be noted that all aspects included in the technical idea specified from the wording described in the claims are embodiments of the present disclosure.

1 ... Medical treatment tool, 2 ... 1st arm, 2A ... 1st end, 2B ... 2nd end,
3 ... 2nd arm, 3A ... 1st end, 3B ... 2nd end, 4 ... connecting part, 5 ... cord,
6 ... Insert plug, 21 ... Conductor, 21A ... Conductive part, 21B ... Tip part,
21C ... Through hole, 22 ... Support, 23 ... Cover, 211, 211A ... Treatment part,
212 ... Connection part, 213 ... First uneven part, 214 ... Second uneven part, 215 ... Third uneven part,
216 ... Fourth uneven portion.

Claims (4)

Each has a first end portion and a second end portion, and includes a first arm and a second arm in which the first end portions are connected to each other so that the distance between the second end portions can be adjusted.
The first arm and the second arm are each
A conductor extending from the first end to the second end,
A support mainly composed of a composite material of a resin and a reinforcing material and extending along the conductor, and a support
A cover that covers the conductor and the support,
Have,
The conductor is
A conductive portion coated on the cover together with the support,
A tip portion that is electrically connected to the conductive portion and is exposed at the second end portion, and a tip portion that is exposed.
Have,
A medical treatment tool having a tip portion having an uneven portion in contact with at least one of the support and the cover. The medical treatment tool according to claim 1.
A medical treatment tool having the tip portion as the uneven portion having a notch recessed in a direction intersecting the extending direction of the conductor. The medical treatment tool according to claim 1 or 2.
A medical treatment tool having the tip portion as the uneven portion having a rough surface joined to at least one of the support and the cover. The medical treatment tool according to any one of claims 1 to 3.
The conductive portion is a medical treatment tool which is a plate material having a through hole filled with at least one part of the support and the cover.

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