WO2018185821A1

WO2018185821A1 - Piezoelectric unit and treatment tool

Info

Publication number: WO2018185821A1
Application number: PCT/JP2017/013989
Authority: WO
Inventors: 塩谷　浩一
Original assignee: オリンパス株式会社
Priority date: 2017-04-03
Filing date: 2017-04-03
Publication date: 2018-10-11

Abstract

This piezoelectric unit 9 is provided with: a piezoelectric member 10 which has first and second primary surfaces 101, 102 that form front and rear surfaces, and generates an ultrasonic vibration in response to a potential difference created between the first and second primary surfaces 101, 102; a first electrode 13 formed on the first primary surface 101; a first wiring C1 having a conductive connection with the first electrode 13; a second electrode 14 formed on the second primary surface 102; a second wiring C2 having a conductive connection with the second electrode 14; and a first plate member 11 having a first facing surface 111 which faces the first primary surface 101, the first plate member 11 being joined to the first primary surface 101 with the first electrode 13 interposed therebetween. The first and second electrodes 13, 14 both extend outward further than the base end of the first plate member 11 in a first direction R3. The first and second wirings C1, C2 respectively have conductive connections with the first and second electrodes 13, 14 in a thickness direction R2.

Description

Piezoelectric unit and treatment instrument

The present invention relates to a piezoelectric unit and a treatment instrument.

2. Description of the Related Art Conventionally, there has been known a treatment instrument that is provided with a piezoelectric unit that applies ultrasonic energy (ultrasonic vibration) to a living tissue, and that treats the living tissue (joining (or anastomosis), cutting, etc.) by applying the ultrasonic vibration. (For example, refer to Patent Document 1).
In the treatment instrument (ultrasonic coagulation / incision forceps) described in Patent Document 1, the piezoelectric unit (piezoelectric element unit) is provided in an ultrasonic probe that grips a living tissue with a jaw. The piezoelectric unit includes the following piezoelectric members (rectangular piezoelectric bodies), first and second electrodes (positive power side electrode plates, negative power side electrode plates), first and second plate members (insulating plates), and First and second wirings (electric cables) are provided.

The piezoelectric member is a piezoelectric body made of a flat plate having a rectangular shape in plan view extending in the longitudinal direction from the distal end to the proximal end of the ultrasonic probe.
The first and second electrodes are each formed of a flat plate having the same planar shape as the piezoelectric member, and are joined so as to sandwich the front and back surfaces of the piezoelectric member.
The first and second plate members are flat plates made of an insulating material and having the same planar shape as the piezoelectric member. The first and second plate members are respectively joined to the front and back surfaces of the piezoelectric member with the first and second electrodes interposed therebetween.
Here, the piezoelectric member, the first and second electrodes, and the first and second plate members are laminated so that the four corners and the four sides of the rectangular shape in plan view are coincident with each other. It is unitized in a rectangular parallelepiped shape. Hereinafter, for convenience of explanation, a block in which the piezoelectric member, the first and second electrodes, and the first and second plate members are unitized will be referred to as a piezoelectric block.
The first and second wirings are conductively connected to the first and second electrodes from both sides in the width direction of the piezoelectric block.
The piezoelectric member vibrates in the thickness direction (direction in which the jaw and the ultrasonic probe face each other) by applying a voltage to the first and second electrodes via the first and second wirings. Generate ultrasonic vibrations in the direction.

JP 2015-43879 A

However, in the piezoelectric unit described in Patent Document 1, the first and second wires are conductively connected to the first and second electrodes from both sides in the width direction of the piezoelectric block. For this reason, it is necessary to provide wiring spaces for the first and second wirings on both sides in the width direction of the piezoelectric block, and there is a problem that it is difficult to reduce the diameter of the ultrasonic probe in the width direction.
Here, in reducing the diameter of the ultrasonic probe in the width direction, it is conceivable to reduce the dimension in the width direction of the piezoelectric member in consideration of the wiring space for the first and second wirings. However, when the dimension in the width direction of the piezoelectric member is reduced, the ultrasonic energy applied to the living tissue is reduced, and it takes time to treat the living tissue.
Therefore, there is a demand for a technique that can reduce the size of the generated ultrasonic energy without reducing it.

The present invention has been made in view of the above, and an object thereof is to provide a piezoelectric unit and a treatment instrument that can be miniaturized without reducing the generated ultrasonic energy.

In order to solve the above-described problems and achieve the object, a piezoelectric unit according to the present invention has a first main surface and a second main surface that is opposite to the first main surface. A piezoelectric member that generates ultrasonic vibration in accordance with a potential difference generated between the first main surface and the second main surface, a first electrode formed on the first main surface, and the first electrode A first wiring conductively connected to the electrode; a second electrode formed on the second main surface; a second wiring conductively connected to the second electrode; and the first main surface And a first plate member joined to the first main surface across the first electrode, the first electrode and the second electrode At least one of the piezoelectric member and the first plate member protrudes in a first direction along the first main surface from at least one end of the piezoelectric member and the first plate member. The wiring is conductively connected to the first electrode in the stacking direction of the first plate member, the first electrode, the piezoelectric member, and the second electrode, and the second wiring is Conductive connection is made in the stacking direction with respect to the second electrode.

Moreover, the treatment tool according to the present invention includes the piezoelectric unit described above.

According to the piezoelectric unit and the treatment tool of the present invention, there is an effect that the size can be reduced without reducing the generated ultrasonic energy.

FIG. 1 is a diagram schematically illustrating a treatment tool according to the first embodiment. FIG. 2 is an enlarged view of the distal end portion of the treatment instrument. 3 is a cross-sectional view taken along the line III-III shown in FIG. FIG. 4 is a diagram illustrating the piezoelectric unit. FIG. 5 is a diagram illustrating the piezoelectric unit. FIG. 6 is a diagram showing a piezoelectric unit according to a modification of the first embodiment. FIG. 7 is a diagram illustrating a piezoelectric unit according to a modification of the first embodiment. FIG. 8 is a diagram for explaining the effect of the modification of the first embodiment. FIG. 9 is a diagram illustrating the piezoelectric unit according to the second embodiment. FIG. 10 is a diagram illustrating the piezoelectric unit according to the second embodiment. FIG. 11 is a diagram for explaining the effect of the second embodiment. FIG. 12 is a diagram illustrating a piezoelectric unit according to a modification of the second embodiment. FIG. 13 is a diagram illustrating a piezoelectric unit according to a modification of the second embodiment. FIG. 14 is a diagram for explaining the effect of the modification of the second embodiment. FIG. 15 is a diagram illustrating the piezoelectric unit according to the third embodiment. FIG. 16 is a diagram illustrating the piezoelectric unit according to the third embodiment. FIG. 17 is a diagram for explaining the effect of the third embodiment.

Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described with reference to the drawings. The present invention is not limited to the embodiments described below. Furthermore, the same code | symbol is attached | subjected to the same part in description of drawing.

(Embodiment 1)
[Schematic configuration of treatment tool]
FIG. 1 is a diagram schematically illustrating a treatment instrument 1 according to the first embodiment.
The treatment tool 1 is, for example, a surgical treatment tool for performing treatment (joining (or anastomosis), separation, etc.) on living tissue through the abdominal wall. As shown in FIG. 1, the treatment instrument 1 includes a handle 2, a shaft 3, and a grip portion 4.
The handle 2 is a part that the surgeon holds by hand. As shown in FIG. 1, the handle 2 is provided with a bending operation lever 21, an operation handle 22, and a fixed handle 23.

As shown in FIG. 1, the shaft 3 has a substantially cylindrical shape, and one end (right end portion in FIG. 1) is connected to the handle 2 via a rotation operation member 5. A grip 4 is attached to the other end of the shaft 3 (left end in FIG. 1). The shaft 3 has a configuration in which a bending portion 31 and an insertion tube portion 32 are connected in order from the left side in FIG.
Here, the rotation operation member 5 supports the shaft 3 and is attached to the handle 2 so as to be rotatable about the central axis of the shaft 3. That is, when the rotation operation member 5 is rotated according to the operation of the surgeon, the shaft 3 and the grip portion 4 attached to the shaft 3 have the center axis of the shaft 3 together with the rotation operation member 5. Rotates as the center.

An opening / closing mechanism (not shown) that opens and closes the jaw 6 (FIG. 1) and the ultrasonic probe 7 (FIG. 1) constituting the grasping portion 4 according to the operation of the operation handle 22 by the operator is provided inside the shaft 3. ) Is provided. Further, inside the shaft 3, the bending portion 31 is bent with respect to the insertion tube portion 32 in accordance with the operation of the bending operation lever 21 by the operator (for example, in two directions, upward or downward in FIG. 1). A bending mechanism (not shown) is provided. Further, an electric cable C (FIG. 1) is disposed inside the shaft 3 from the one end side (right end side in FIG. 1) to the other end side (left end side in FIG. 1) via the handle 2. ing.

FIG. 2 is an enlarged view of the distal end portion of the treatment instrument 1. 3 is a cross-sectional view taken along the line III-III shown in FIG. In FIG. 3, the first to

fourth metal films

13, 14, 112, 122 (see FIG. 5) and the brazing materials S1, S2 (see FIG. 5) are not shown for convenience of explanation.
Here, the “tip side” described below is the tip side of the grip portion 4 and means the left side in FIGS. 1 and 2. In addition, the “base end side” described below is the shaft 3 side of the grip portion 4 and means the right side in FIGS. 1 and 2.
The grasping part 4 is a part that treats the living tissue by grasping the living tissue to be treated and applying ultrasonic energy (ultrasonic vibration) to the living tissue. As shown in FIG. 1 or FIG. 2, the grip portion 4 includes a jaw 6 and an ultrasonic probe 7.

The jaw 6 is disposed on the upper side in FIGS. 1 and 2 with respect to the ultrasonic probe 7. The jaw 6 is a long member extending in the longitudinal direction of the grip portion 4 (the direction from the distal end of the grip portion 4 to the base end (left and right direction in FIGS. 1 and 2)). The other end (left end in FIGS. 1 and 2) is pivotally supported so as to be rotatable in the direction of arrow R1 (FIG. 2). The jaw 6 rotates in the direction of the arrow R1 according to the operation of the operation handle 22 by the operator. In addition, the jaw 6 is provided with a sawtooth pressing portion 61 made of an insulating material on the lower surface in FIGS. 1 and 2.

The ultrasonic probe 7 is a portion that generates ultrasonic vibrations, is formed in a long shape extending in the longitudinal direction of the grip portion 4, and is connected to the other end of the shaft 3 (the left end portion in FIGS. 1 and 2). Fixed. The ultrasonic probe 7 grips the living tissue with the jaw 6 according to the rotation of the jaw 6 in the direction of the arrow R1, and applies ultrasonic vibration to the living tissue. As shown in FIGS. 1 to 3, the ultrasonic probe 7 includes a cover member 8 and a piezoelectric unit 9 (FIGS. 2 and 3).
The cover member 8 is made of duralumin or a titanium alloy such as 64 Ti, has a substantially cylindrical shape extending in the longitudinal direction of the grip portion 4, and a proximal end side is fixed to the other end of the shaft 3. A hollow portion 81 (FIG. 3) extending along the longitudinal direction of the cover member 8 is formed inside the cover member 8. In the cover member 8, an opening 82 (FIG. 3) that communicates the hollow portion 81 and the outside is formed on the distal end side of the upper surface in FIGS. 1 to 3. Further, in the cover member 8, the base end side communicates the hollow portion 81 with the outside, and an opening for inserting the electric cable C disposed up to the other end side of the shaft 3 into the hollow portion 81. (Not shown) is formed.
The piezoelectric unit 9 is a part that generates ultrasonic vibrations according to the electric power supplied via the electric cable C, and is accommodated in the hollow part 81 with a part exposed to the outside via the opening 82. The Hereinafter, a detailed configuration of the piezoelectric unit 9 will be described.

[Configuration of piezoelectric unit]
4 and 5 are diagrams showing the piezoelectric unit 9. Specifically, FIG. 4 is a perspective view of the piezoelectric unit 9 viewed from the base end side. FIG. 5 is a cross-sectional view of the piezoelectric unit 9 cut along a cut surface along the longitudinal direction of the grip portion 4. 4 and 5, the upper side is the side close to the jaw 6. In FIG. 4, the first to

fourth metal films

13, 14, 112, 122 (FIG. 5) and the brazing materials S1, S2 (FIG. 5) are omitted for convenience of explanation.
As shown in FIGS. 3 to 5, the piezoelectric unit 9 includes a piezoelectric member 10, a first plate member 11, a second plate member 12, a first wiring C1 (FIGS. 4 and 5), A second wiring C2 (FIGS. 4 and 5) is provided.

The piezoelectric member 10 is a piezoelectric body composed of a flat plate having a rectangular shape in plan view extending in the longitudinal direction of the grip portion 4. 3 to 5 of the piezoelectric member 10, the upper plate surface corresponds to the first main surface 101 according to the present invention. A first metal film 13 (FIG. 5) is formed on the entire surface of the first main surface 101. The first metal film 13 corresponds to the first electrode according to the present invention. 3 to 5, the lower plate surface of the piezoelectric member 10 corresponds to the second main surface 102 according to the present invention. A second metal film 14 (FIG. 5) is formed on the entire surface of second main surface 102. The second metal film 14 corresponds to the second electrode according to the present invention.
The piezoelectric member 10 described above has the piezoelectric member 10 according to the potential difference generated between the first and second metal films 13 and 14 (potential difference generated between the first and second main surfaces 101 and 102). Ultrasonic vibration is generated with the vibration direction as the thickness direction R2 (FIGS. 3 to 5).
The thickness direction R2 is a direction in which the jaw 6 and the ultrasonic probe 7 face each other, and corresponds to the stacking direction according to the present invention.

By the way, as the piezoelectric member 10, a heat generation temperature (for example, a maximum of 200 ° C. or more) generated when ultrasonic vibration occurs or the piezoelectric member 10 and the first and

second plate members

11, 12 are brazed. It is necessary that the piezoelectric characteristics are not deteriorated even by the soldering temperature (for example, 200 ° C. or higher for solder bonding and 300 ° C. or higher for AuSn bonding). For this reason, for example, when lead zirconate titanate (PZT) generally used for the piezoelectric member 10 is used, the Curie point is not a sufficiently high temperature compared to the above-described temperature, but the above-described temperature. As a result, the piezoelectric characteristics deteriorate. As a piezoelectric material having durability at the above-described temperature, there is a piezoelectric single crystal lithium niobate single crystal (LiNbO3).
Further, in the crystal orientation called 36-degree rotation Y cut of lithium niobate single crystal (LiNbO3), the electromechanical coupling coefficient in the thickness direction R2 has the same value as lead zirconate titanate (PZT), and the efficiency Thus, the electrical signal can be converted into ultrasonic vibration. The value of the electromechanical coupling coefficient varies depending on the crystal orientation, and becomes a maximum at a certain angle.
From the above, in the first embodiment, the piezoelectric member 10 uses a 36-degree rotated Y-cut lithium niobate single crystal (LiNbO3). Here, a specific crystal orientation, for example, a 36-degree rotation Y-cut is given in consideration of availability in the market, but not limited thereto, the vicinity thereof within a range where the electromechanical coupling coefficient does not greatly decrease. The crystal orientation of

The first plate member 11 is configured by a flat plate having a rectangular shape in plan view extending in the longitudinal direction of the grip portion 4. 3 to 5 of the first plate member 11, the lower plate surface corresponds to the first facing surface 111 according to the present invention. A third metal film 112 (FIG. 5) is formed on the entire surface of the first facing surface 111.
Here, the width dimension of the first plate member 11 is set to be the same as the width dimension of the piezoelectric member 10 as shown in FIG. 3 or FIG. Moreover, the length dimension of the longitudinal direction of the 1st board member 11 is set so that it may become smaller than the length dimension of the longitudinal direction of the piezoelectric member 10, as shown in FIG. 4 or FIG.
As shown in FIG. 5, the first plate member 11 has a longitudinal position that coincides with the piezoelectric member 10 in the longitudinal direction, and the base end side of the piezoelectric member 10 is the first plate member 11. In a state of projecting to the base end side (first direction R3) from the base end of the first braid, the first main surface 101 is brazed (joined) via the brazing material S1.
The first plate member 11 described above is shown in FIG. 3 when the upper plate surface is exposed to the outside through the opening 82 and the living tissue is grasped by the jaw 6 and the ultrasonic probe 7. Contact living tissue. That is, the first plate member 11 imparts ultrasonic vibration generated in the piezoelectric member 10 to the living tissue.

The second plate member 12 has the same shape as the first plate member 11. 3 to 5 of the second plate member 12, the upper plate surface corresponds to the second facing surface 121 according to the present invention. A fourth metal film 122 (FIG. 5) is formed on the entire surface of the second facing surface 121.
As shown in FIG. 5, the second plate member 12 has the brazing material S 2 so that the four corners and the four sides of the first plate member 11 having a rectangular shape in plan view coincide with each other. And is soldered (joined) to the second main surface 102.
Examples of the brazing materials S1 and S2 include AuSn and solder. Moreover, as a material of the 1st,

2nd board members

11 and 12, insulating materials, such as zirconia and alumina with high mechanical strength, can be illustrated. Further, as the material of the first to

fourth metal films

13, 14, 112, 122, Ti / Pt / Au, Ti / Ni / Au, etc. for improving the adhesion of the brazing materials S1, S2 such as AuSn and solder. Can be illustrated.

Here, in the piezoelectric member 10, the portions facing the first and

second plate members

11 and 12 correspond to the piezoelectric main body 103 (FIGS. 4 and 5) according to the present invention. Further, in the piezoelectric member 10, a portion protruding in the first direction R3 from the base ends of the first and

second plate members

11 and 12 is a piezoelectric protruding portion 104 (FIGS. 4 and 5) according to the present invention. It corresponds to. That is, the first and second

main surfaces

101 and 102 are the front and back surfaces of the piezoelectric main body portion 103 and the piezoelectric extension portion 104. The first and

second metal films

13 and 14 are respectively formed on the first and second

main surfaces

101 and 102 across the piezoelectric main body 103 and the piezoelectric overhang 104.
The first wiring C1 constitutes the electric cable C, and a conductive adhesive from the upper side in FIGS. 4 and 5 with respect to the portion of the first metal film 13 formed on the piezoelectric overhanging portion 104. Alternatively, the conductive connection is made by solder or the like. That is, the first wiring C1 is conductively connected to the first metal film 13 in the thickness direction R2.
The second wiring C2 constitutes the electric cable C, and a conductive adhesive from the lower side in FIGS. 4 and 5 to the portion of the second metal film 14 formed on the piezoelectric overhanging portion 104. Alternatively, the conductive connection is made by solder or the like. That is, the second wiring C2 is conductively connected to the second metal film 14 in the thickness direction R2.
The piezoelectric member 10 generates ultrasonic vibrations when a voltage is applied to the first and

second metal films

13 and 14 via the first and second wirings C1 and C2.

According to the first embodiment described above, the following effects are obtained.
In the piezoelectric unit 9 according to the first embodiment, the piezoelectric member 10 includes the piezoelectric main body 103 that faces the first and

second plate members

11 and 12, and the first and

second plate members

11 and 12. And a piezoelectric overhanging portion 104 projecting in the first direction R3 from the base end. The first and second wirings C1 and C2 are conductively connected in the thickness direction R2 to the portions of the first and

second metal films

13 and 14 formed on the piezoelectric extension 104, respectively. .
Therefore, it is not necessary to provide wiring spaces for the first and second wirings C1 and C2 on both sides in the width direction of the piezoelectric member 10 and the first and

second plate members

11 and 12, and the grip portion 4 (ultrasonic probe 7). ) In the width direction. Moreover, since the diameter of the grip part 4 can be reduced in the width direction as described above, it is not necessary to reduce the size of the piezoelectric member 10 in the width direction when reducing the diameter.
Therefore, according to the piezoelectric unit 9 according to the first embodiment, there is an effect that it is possible to reduce the size in the width direction without reducing the generated ultrasonic energy.

In the piezoelectric unit 9 according to the first embodiment, the piezoelectric member 10 has the first and

second plate members

11 and 12 joined to both the first and second

main surfaces

101 and 102, respectively. Yes.
For this reason, when the piezoelectric unit 9 is incorporated in a product, the fragile piezoelectric member 10 can be protected by the first and

second plate members

11 and 12.

(Modification of Embodiment 1)
6 and 7 are diagrams showing a piezoelectric unit 9A according to a modification of the first embodiment. FIG. 8 is a diagram for explaining the effect of the modification of the first embodiment. Specifically, FIG. 6 is a perspective view of the piezoelectric unit 9A viewed from the base end side. FIG. 7 is a cross-sectional view corresponding to FIG. FIG. 8A is a cross-sectional view of the ultrasonic probe 7 described in the first embodiment described above, cut along a cut surface along the longitudinal direction. FIG. 8B is a cross-sectional view of the ultrasonic probe 7 employing the piezoelectric unit 9A according to the present modification, cut along a cut surface along the longitudinal direction. 6 to 8, the upper side is the side close to the jaw 6. 6 and 8, the first to

fourth metal films

13, 14, 112, 122 (FIG. 7) and the brazing materials S1, S2 (FIG. 7) are not shown for convenience of explanation.
In the first embodiment described above, as shown in FIG. 6 or 7, a piezoelectric unit 9 A in which the second plate member 12 is omitted may be employed instead of the piezoelectric unit 9.
If such a piezoelectric unit 9A is employed, the dimension of the cover member 8 in the thickness direction R2 on the front end side of the cover member 8 can be determined by comparing the second plate member 12 as shown in FIG. 8 (a) and FIG. 8 (b). Can be reduced by the dimension D1 (FIG. 8B) corresponding to the omission, and the grip portion 4 can be reduced in diameter in the thickness direction R2.
In the present modification, the second wiring C2 is not limited to the configuration in which the second metal film 14 is conductively connected to the portion formed in the piezoelectric overhanging portion 104 of the second metal film 14, but is formed in the piezoelectric main body 103. You may employ | adopt the structure electrically conductively connected to a part.

(Embodiment 2)
Next, the second embodiment will be described.
In the following description, the same reference numerals are given to the same components as those in the first embodiment described above, and detailed description thereof will be omitted or simplified.
9 and 10 are diagrams showing the piezoelectric unit 9B according to the second embodiment. Specifically, FIG. 9 is a perspective view of the piezoelectric unit 9B viewed from the base end side. FIG. 10 is a cross-sectional view corresponding to FIG. 9 and 10, the lower side is the side close to the jaw 6. That is, in FIG. 9 and FIG. 10, for convenience of explanation, the piezoelectric unit 9 B is illustrated in an upside down posture with respect to FIG. 4 and FIG. 5. In FIG. 9, the first to

fourth metal films

13, 14, 112, 122 (FIG. 10) and the brazing materials S1, S2 (FIG. 10) are not shown for convenience of explanation.
The second embodiment is different from the first embodiment described above in that a piezoelectric unit 9B different from the piezoelectric unit 9 is employed as shown in FIG. 9 or FIG.

In the piezoelectric unit 9B, as shown in FIG. 9 or FIG. 10, the longitudinal dimension of the piezoelectric unit 9 described in the first embodiment is different from that of the first plate member 11 in the first length. A plate member 11B is employed.
The length dimension in the longitudinal direction of the first plate member 11B is set to be larger than the length dimension in the longitudinal direction of the piezoelectric member 10, as shown in FIG. 9 or FIG.
As shown in FIG. 10, the first plate member 11 B has a longitudinal position that coincides with the piezoelectric member 10, and the base end side of the first plate member 11 B is first than the base end of the piezoelectric member 10. In the state of projecting in the direction R3, the first main surface 101 is brazed (joined) via the brazing material S1.

Here, in the first plate member 11B, the portion facing the piezoelectric member 10 corresponds to the first main body 113 (FIGS. 9 and 10) according to the present invention. Further, in the first plate member 11B, the portion protruding in the first direction R3 from the base end of the piezoelectric member 10 corresponds to the first protruding portion 114 (FIGS. 9 and 10) according to the present invention. . That is, the first facing surface 111 is a surface on the piezoelectric member 10 side in the first main body portion 113 and the first projecting portion 114.
The first wiring C1 according to the second embodiment is conductive from the upper side in FIGS. 9 and 10 with respect to the portion of the third metal film 112 formed in the first overhanging portion 114. Conductive connection is made with an adhesive or solder. The first metal film 13, the brazing material S1, and the third metal film 112 correspond to the first electrode 13B (FIG. 10) according to the present invention. That is, the first electrode 13 B is formed on the first main surface 101 and the first facing surface 111 across the piezoelectric member 10 and the first overhanging portion 114.

According to the second embodiment described above, the following effects are obtained in addition to the same effects as those of the first embodiment.
FIG. 11 is a diagram for explaining the effect of the second embodiment. Specifically, FIG. 11 (a) is the same diagram as FIG. 8 (a). FIG. 11B is a cross-sectional view of the ultrasonic probe 7 employing the piezoelectric unit 9B according to the second embodiment, cut along a cut surface along the longitudinal direction. In FIG. 11, the upper side is the side close to the jaw 6. In FIG. 11, the first to

fourth metal films

13, 14, 112, 122 (FIG. 10) and the brazing materials S1, S2 (FIG. 10) are omitted for convenience of explanation.

In the piezoelectric unit 9B according to the second embodiment, the first plate member 11B protrudes in the first direction R3 from the first main body 113 facing the piezoelectric member 10 and the base end of the piezoelectric member 10. A first overhanging portion 114. The first wiring C1 is conductively connected from the lower side in FIG. 11B to the portion of the third metal film 112 formed in the first overhanging portion 114. Further, the second wiring C2 is conductively connected from the lower side in FIG. 11B to the portion of the second metal film 14 formed on the piezoelectric overhanging portion 104.
Therefore, the drawing direction of the first and second wirings C1 and C2 can be set to the same direction (downward in FIG. 11B), and the wiring for the first and second wirings C1 and C2 can be set. The space can be reduced in the thickness direction R2. That is, if such a piezoelectric unit 9B is employed, the dimension in the thickness direction R2 of the cover member 8 can be set according to the reduction of the wiring space, as can be seen by comparing FIG. 11 (a) and FIG. 11 (b). The dimension D2 (FIG. 11B) can be reduced, and the grip portion 4 can be reduced in the thickness direction R2.
Further, since the drawing directions of the first and second wirings C1 and C2 are set in the same direction, the wiring work to the first electrode 13B and the second metal film 14 can be easily performed. Productivity of the piezoelectric unit 9B can be improved.

(Modification of Embodiment 2)
12 and 13 are diagrams showing a piezoelectric unit 9C according to a modification of the second embodiment. FIG. 14 is a diagram for explaining the effect of the modification of the second embodiment. Specifically, FIG. 12 is a perspective view of the piezoelectric unit 9C viewed from the base end side. FIG. 13 is a cross-sectional view corresponding to FIG. FIG. 14A is the same diagram as FIG. FIG. 14B is a cross-sectional view of the ultrasonic probe 7 employing the piezoelectric unit 9C according to the present modification, cut along a cut surface along the longitudinal direction. 12 to 14, the upper side is the side close to the jaw 6. In FIGS. 12 and 14, the first to

fourth metal films

13, 14, 112, 122 (FIG. 13) and the brazing materials S1, S2 (FIG. 13) are omitted for convenience of explanation.
In the second embodiment described above, as shown in FIG. 12 or FIG. 13, a piezoelectric unit 9C in which the second plate member 12 is omitted may be employed instead of the piezoelectric unit 9B.
If such a piezoelectric unit 9C is employed, as can be seen by comparing FIG. 14A and FIG. 14B, the front end side of the cover member 8 is the same as the modification of the first embodiment described above. The dimension in the thickness direction R2 can be reduced by the dimension D1 (FIG. 14B) corresponding to the omission of the second plate member 12, and the grip portion 4 can be reduced in the thickness direction R2. .

(Embodiment 3)
Next, the third embodiment will be described.
In the following description, the same reference numerals are given to the same components as those in the first embodiment described above, and detailed description thereof will be omitted or simplified.
15 and 16 are diagrams showing a piezoelectric unit 9D according to the third embodiment. Specifically, FIG. 15 is a perspective view of the piezoelectric unit 9D viewed from the base end side. FIG. 16 is a cross-sectional view corresponding to FIG. 15 and 16, the upper side is the side close to the jaw 6. In FIG. 15, the first to

fourth metal films

13, 14, 112, 122 (FIG. 16) and the brazing materials S1, S2 (FIG. 16) are omitted for convenience of explanation.
As shown in FIG. 15 or FIG. 16, the third embodiment is different from the first embodiment described above in that a piezoelectric unit 9D different from the piezoelectric unit 9 is employed.

In the piezoelectric unit 9D, as shown in FIG. 15 or FIG. 16, first and

second plate members

11D and 12D having different shapes from the first and

second plate members

11 and 12 are employed.
The first plate member 11D is configured by a flat plate, similar to the first plate member 11 described in the first embodiment. Then, as shown in FIG. 15 or FIG. 16, the first plate member 11D includes a first main body portion 113D having the same planar shape as the piezoelectric member 10, and a first end from the base end of the first main body portion 113D. 1st overhang | projection part 114D which protrudes in 1 direction R3. That is, the first facing surface 111 is a surface on the piezoelectric member 10 side in the first main body portion 113D and the first overhang portion 114D.
Here, the width dimension of the first projecting portion 114D is set to be smaller than the width dimension of the first main body portion 113D.
Then, as shown in FIG. 16, the first plate member 11 D has four corners and four sides of the first main body 113 D and the piezoelectric member 10 that are rectangular in plan view, and the first plate member 11 D matches the first side. With the overhanging portion 114D protruding in the first direction R3 from the base end of the piezoelectric member 10, it is brazed (joined) to the first main surface 101 via the brazing material S1.
The first wiring C1 according to the third embodiment is conductive from the lower side in FIGS. 15 and 16 with respect to the portion of the third metal film 112 formed on the first overhanging portion 114D. Conductive connection is made with an adhesive or solder. The first metal film 13, the brazing filler metal S1, and the third metal film 112 correspond to the first electrode 13D (FIG. 16) according to the present invention. That is, the first electrode 13D is formed on the first main surface 101 and the first facing surface 111 across the piezoelectric member 10 and the first overhanging portion 114D.

The second plate member 12D is configured by a flat plate, similar to the second plate member 12 described in the second embodiment. Then, as shown in FIG. 15 or FIG. 16, the second plate member 12 D has a second main body portion 123 having the same planar shape as the piezoelectric member 10, and a second end from the proximal end of the second main body portion 123. And a second overhanging portion 124 projecting in the first direction R3. That is, the second facing surface 121 is a surface on the piezoelectric member 10 side in the second main body portion 123 and the second projecting portion 124.
Here, the width dimension of the second overhanging portion 124 is set to be smaller than the width dimension of the second main body portion 123.
Then, as shown in FIG. 16, the second plate member 12 D has the four corners and the four sides of the rectangular shape of the second main body 123 and the piezoelectric member 10 that coincide with each other, With the protruding portion 124 protruding in the first direction R3 from the base end of the piezoelectric member 10, it is brazed (joined) to the second main surface 102 via the brazing material S2. In addition, as shown in FIG. 15 or FIG. 16, the first and second projecting

portions

114D and 124 are in a state where the first and

second plate members

11D and 12D are joined to the piezoelectric member 10, respectively. They are formed so as not to overlap each other in the thickness direction R2.
The second wiring C2 according to the third embodiment is conductive from the upper side in FIGS. 15 and 16 with respect to the portion of the fourth metal film 122 formed in the second overhanging portion 124. Conductive connection is made with an adhesive or solder. The second metal film 14, the brazing filler metal S2, and the fourth metal film 122 correspond to the second electrode 14D (FIG. 16) according to the present invention. That is, the second electrode 14 D is formed on the second main surface 102 and the second facing surface 121 across the piezoelectric member 10 and the second overhanging portion 124.

According to the third embodiment described above, the following effects are obtained in addition to the same effects as those of the first embodiment.
FIG. 17 is a diagram for explaining the effect of the third embodiment. Specifically, FIG. 17A is the same diagram as FIG. FIG. 17B is a cross-sectional view of the ultrasonic probe 7 employing the piezoelectric unit 9D according to the third embodiment, cut along a cut surface along the longitudinal direction. In FIG. 17, the upper side is the side close to the jaw 6. In FIG. 17, the first to

fourth metal films

13, 14, 112, 122 (FIG. 16) and the brazing materials S1, S2 (FIG. 16) are not shown for convenience of explanation.

In the piezoelectric unit 9D according to the third embodiment, the first plate member 11D protrudes in the first direction R3 from the first main body 113D facing the piezoelectric member 10 and the base end of the piezoelectric member 10. 1st overhang | projection part 114D is provided. The first wiring C1 is conductively connected from the lower side in FIG. 17B to the portion of the third metal film 112 formed in the first overhanging portion 114D. The second plate member 12 D includes a second main body 123 that faces the piezoelectric member 10, and a second protruding portion 124 that protrudes in the first direction R 3 from the base end of the piezoelectric member 10. . The second wiring C2 is conductively connected from the upper side in FIG. 17B to the portion of the fourth metal film 122 formed in the second overhanging portion 124.
For this reason, the drawing direction of the first and second wirings C1 and C2 is set to the piezoelectric member 10 side (first wiring C1: in FIG. 17B, downward, second wiring C2 in FIG. 17B). ), And the wiring space for the first and second wirings C1 and C2 can be reduced in the thickness direction R2. That is, if such a piezoelectric unit 9D is employed, the dimension in the thickness direction R2 of the cover member 8 can be set according to the reduction of the wiring space, as can be seen by comparing FIG. 17 (a) and FIG. 17 (b). Therefore, the grip portion 4 can be reduced in diameter in the thickness direction R2.
Further, since the entire surfaces of the first and second

main surfaces

101 and 102 of the piezoelectric member 10 are covered with the first and

second plate members

11D and 12D, they are easily broken when the piezoelectric unit 9D is incorporated into a product. The piezoelectric member 10 can be sufficiently protected by the first and

second plate members

11D and 12D.

In the piezoelectric unit 9D according to the third embodiment, the first and second projecting

portions

114D and 124 are formed so as not to overlap each other in the thickness direction R2.
For this reason, for example, compared to a configuration in which all of the first and

second overhang portions

114D and 124 are formed so as to overlap each other in the thickness direction, the first and

second overhang portions

114D and 124 are moved to. The wiring work of the first and second wirings C1 and C2 can be easily performed, and the productivity of the piezoelectric unit 9D can be improved. In addition, since the spatial distance between the first and

second overhang portions

114D and 124 can be increased, the dielectric strength can also be improved.

(Other embodiments)
So far, the embodiment for carrying out the present invention has been described, but the present invention should not be limited only by the embodiment described above.
In the first to third embodiments and the modifications described above, the first and second electrodes according to the present invention are the first to

fourth metal films

13, 14, 112, 122 and the brazing materials S1, S2. Although comprised, it is not restricted to this, You may comprise with the flat plate which has electroconductivity. Further, at least one of the flat plate-like first and second electrodes is set to be more than the base end of at least one of the piezoelectric member 10, the

first plate members

11, 11B, 11D, and the

second plate members

12, 12D. The first and second wirings C1 and C2 may be extended in the first direction R3 and the extended parts may be provided.

In the first embodiment and the modification described above, the piezoelectric member 10 and the first and

second plate members

11 and 12 are joined to each other by brazing. Etc. may be joined. At this time, as the adhesive, in addition to the adhesive having conductivity, an adhesive having no conductivity may be employed.
Similarly, in the above-described second embodiment and this modification, the piezoelectric member 10 and the first and

second plate members

11B and 12 may be joined directly or by an adhesive. However, when an adhesive is used for joining the piezoelectric member 10 and the first plate member 11B, the adhesive is an adhesive having conductivity. In the above-described third embodiment, the piezoelectric member 10 and the first and

second plate members

11D and 12D may also be joined directly or with a conductive adhesive.
In Embodiment 3 described above, the first and

second overhang portions

114D and 124 are formed so as not to overlap each other in the thickness direction R2, but the present invention is not limited to this, and all overlap in the thickness direction R2. A configuration or a configuration in which only a part thereof overlaps in the thickness direction R2 may be adopted.
In the first to third embodiments and the modifications described above, the first to fourth metal films 13 are formed on the entire surfaces of the first and second

main surfaces

101 and 102 and the first and second opposing

surfaces

111 and 121. , 14, 112, 122 are formed, but the present invention is not limited to this, and a configuration formed only on a part of the entire surface may be adopted.

In the first to third embodiments and the modifications described above, the ultrasonic probe 7 is fixed and the jaw 6 is opened and closed with respect to the ultrasonic probe 7. However, the present invention is not limited to this. For example, the jaw 6 may be fixed and the ultrasonic probe 7 may be opened / closed with respect to the jaw 6, or both the jaw 6 and the ultrasonic probe 7 are configured to be movable so that the jaw 6 and the ultrasonic probe 7 are movable. It may be configured to open and close. Further, a configuration in which the jaw 6 is omitted may be adopted.
In the first to third embodiments and the modifications described above, a configuration in which the piezoelectric unit 9 (9A to 9D) is also provided in the jaw 6 may be employed.
In the first to third embodiments and the modifications described above, the treatment instrument 1 is configured to apply ultrasonic vibration to a living tissue. However, the present invention is not limited to this, and other than ultrasonic vibration, high-frequency energy, You may employ | adopt the structure which provides a thermal energy further.

DESCRIPTION OF SYMBOLS 1 Treatment tool 2 Handle 3 Shaft 4 Gripping part 5 Rotation operation member 6 Jaw 7 Ultrasonic probe 8

Cover member

9, 9A-9D Piezoelectric unit 10

Piezoelectric member

11, 11B, 11D

1st board member

12, 12D 2nd board Member 13

1st metal film

13B, 13D 1st electrode 14 2nd metal film 14D 2nd electrode 21 Bending operation lever 22 Operation handle 23 Fixed handle 31 Bending part 32 Insertion pipe part 61 Holding part 81 Hollow part 82

Opening Parts

101, 102 First and second main surfaces 103 Piezoelectric main body part 104 Piezoelectric overhanging part 111 First opposing surface 112

Third metal film

113, 113D First

main body part

114, 114D First overhanging part 121 2nd opposing surface 122 4th metal film 123 2nd main-body part 124 2nd overhang | projection part C Electric cable C1, C2 1st, 2nd Wiring D1 to D4 Dimensions R1 Arrow R2 Thickness direction R3 First direction S1, S2 Brazing material

Claims

An ultrasonic wave according to a potential difference generated between the first main surface and the second main surface, the first main surface and a second main surface opposite to the first main surface; A piezoelectric member that generates vibration;
A first electrode formed on the first main surface;
A first wiring conductively connected to the first electrode;
A second electrode formed on the second main surface;
A second wiring conductively connected to the second electrode;
A first plate member having a first facing surface facing the first main surface and being joined to the first main surface with the first electrode interposed therebetween,
At least one of the first electrode and the second electrode is:
Projecting in a first direction along the first main surface from at least one end of the piezoelectric member and the first plate member;
The first wiring is
Conductively connected to the first electrode in the stacking direction of the first plate member, the first electrode, the piezoelectric member, and the second electrode,
The second wiring is
A piezoelectric unit that is conductively connected in the stacking direction to the second electrode.
The second plate member according to claim 1, further comprising a second plate member having a second facing surface facing the second main surface and joined to the second main surface with the second electrode interposed therebetween. Piezoelectric unit.
The piezoelectric member is
Piezoelectric main body portions respectively facing the first plate member and the second plate member;
A piezoelectric overhang formed integrally with the piezoelectric main body and projecting in the first direction from the ends of the first plate member and the second plate member;
The first main surface and the second main surface are:
The front and back surfaces of the piezoelectric body and the piezoelectric overhang,
The first electrode is
Formed on the first main surface across the piezoelectric main body and the piezoelectric overhang,
The first wiring is
Of the first electrode, conductively connected to the portion formed in the piezoelectric overhang,
The second electrode is
Formed on the second main surface across the piezoelectric main body and the piezoelectric overhang,
The second wiring is
The piezoelectric unit according to claim 2, wherein the piezoelectric unit is conductively connected to a portion of the second electrode formed in the piezoelectric overhang portion.
The piezoelectric member is
A piezoelectric main body facing the second plate member;
A piezoelectric overhang formed integrally with the piezoelectric main body and projecting in the first direction from the end of the second plate member;
The first main surface and the second main surface are:
The front and back surfaces of the piezoelectric body and the piezoelectric overhang,
The first plate member is
A first body portion facing the piezoelectric member;
A first projecting portion integrally formed with the first main body portion and projecting in the first direction from an end portion of the piezoelectric projecting portion;
The first facing surface is
The piezoelectric member side surfaces of the first main body and the first overhang,
The first electrode is
Formed on the first main surface and the first facing surface across the piezoelectric member and the first overhang portion;
The first wiring is
Of the first electrode, conductively connected to the portion formed in the first overhang portion,
The second electrode is
Formed on the second main surface across the piezoelectric main body and the piezoelectric overhang,
The second wiring is
The piezoelectric unit according to claim 2, wherein the piezoelectric unit is conductively connected to a portion of the second electrode formed in the piezoelectric overhang portion.
The first plate member is
A first body portion facing the piezoelectric member;
A first projecting portion integrally formed with the first main body and projecting in the first direction from the end of the piezoelectric member;
The first facing surface is
The piezoelectric member side surfaces of the first main body and the first overhang,
The second plate member is
A second body portion facing the piezoelectric member;
A second projecting portion integrally formed with the second main body portion and projecting in the first direction from the end of the piezoelectric member;
The second facing surface is
The piezoelectric member side surfaces of the second main body and the second overhang,
The first electrode is
Formed on the first main surface and the first facing surface across the piezoelectric member and the first overhang portion;
The first wiring is
Of the first electrode, conductively connected to the portion formed in the first overhang portion,
The second electrode is
Formed on the second main surface and the second facing surface across the piezoelectric member and the second overhanging portion;
The second wiring is
The piezoelectric unit according to claim 2, wherein the piezoelectric unit is conductively connected to a portion of the second electrode formed on the second overhanging portion.
At least a part of the first overhanging portion and the second overhanging portion are:
The piezoelectric unit according to claim 5, wherein the piezoelectric units do not overlap with each other in the stacking direction.
A treatment instrument comprising the piezoelectric unit according to any one of claims 1 to 6.