Ultrasonic Treatment Device

Abstract

With a view to providing an ultrasonic treatment tool that makes it possible to avoid increase in diameter of a grip portion to be grasped by a practitioner while properly dealing with the heat generated by an ultrasonic transducer, this ultrasonic treatment tool comprises: an ultrasonic transducer (9) which generates ultrasonic vibration; a handle member (10) housing the ultrasonic transducer (9) therein; and a vibration transmission member which is connected to the ultrasonic transducer (9) and transmits the ultrasonic vibration generated by the ultrasonic transducer (9). The handle member (10) is provided with an outer member (11) which forms the exterior and an inner member (12) which is disposed within the outer member (11) and houses the ultrasonic transducer (9) therein. The inner member (12) is composed of a material having a greater thermal capacity than the outer member (11).

Description

[Technical field]

[0001] The present invention relates to an ultrasonic treatment device. [Background technology]

[0002] 2. Description of the Related Art Conventionally, ultrasonic treatment devices are known that use ultrasonic vibrations generated by an ultrasonic transducer to perform incision, cutting, and the like of biological tissue (see, for example, Patent Document 1). In the ultrasonic treatment device described in Patent Document 1, an ultrasonic transducer is disposed inside a grip part that is held by an operator. Also, heat dissipation fins are provided on the outer surface of the grip part to dissipate heat generated in the ultrasonic transducer to the outside through the grip part. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2001-321388 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the ultrasonic treatment device described in Patent Document 1, the operator holds the heat dissipation fin directly, and heat is transferred to the operator's hand. In addition, in consideration of the effect of heat on the operator's hand, the height of the heat dissipation fin must be increased, and the diameter of the grip part and the holding part including the heat dissipation fin must be increased by the height of the heat dissipation fin. Therefore, there is a demand for a technology that can adequately deal with the heat generated in the ultrasonic transducer while avoiding an increase in the diameter of the portion that is grasped by the surgeon.

[0005] The present invention has been made in consideration of the above, and aims to provide an ultrasonic treatment instrument that can adequately deal with heat generated in an ultrasonic transducer while avoiding an increase in the diameter of the portion held by the surgeon. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems and achieve the object, the ultrasonic treatment instrument of the present invention comprises an ultrasonic transducer that generates ultrasonic vibrations, a handle member in which the ultrasonic transducer is housed, and a vibration transmission member connected to the ultrasonic transducer and transmitting the ultrasonic vibrations generated by the ultrasonic transducer, wherein the handle member comprises an outer member that forms an exterior, and an inner member that is disposed inside the outer member and in which the ultrasonic transducer is housed, and the inner member is made of a material having a greater heat capacity than the outer member. Effect of the Invention

[0007] According to the ultrasonic treatment device of the present invention, it is possible to sufficiently deal with the heat generated in the ultrasonic transducer, while preventing the diameter of the gripping portion that is gripped by the surgeon from becoming large. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram showing a schematic configuration of a treatment system according to an embodiment. [Diagram 2] FIG. 2 is a diagram showing an ultrasonic treatment device. [Diagram 3] FIG. 3 is a diagram showing the internal structure of the handle unit. [Figure 4] FIG. 4 is a diagram illustrating the shape of the outer surface of the outer member. [Diagram 5] FIG. 5 is a diagram illustrating the shape of the outer surface of the outer member. [Figure 6] FIG. 6 is a diagram illustrating the shape of the outer surface of the outer member. [Figure 7] FIG. 7 is a diagram illustrating the shape of the outer surface of the outer member. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, a mode for carrying out the present invention (hereinafter, referred to as an embodiment) will be described with reference to the drawings. Note that the present invention is not limited to the embodiment described below. Furthermore, in the description of the drawings, the same parts are given the same reference numerals.

[0010] [Overall configuration of treatment system] FIG. 1 is a diagram showing a schematic configuration of a treatment system 1 according to an embodiment. The treatment system 1 applies ultrasonic vibration to a biological tissue such as a bone to treat the biological tissue. Here, the treatment means, for example, removal or cutting of the biological tissue such as a bone. Note that FIG. 1 illustrates a treatment system for performing anterior cruciate ligament reconstruction as the treatment system 1. As shown in FIG. 1, the treatment system 1 includes an endoscope apparatus 2, a treatment apparatus 3, a guiding device 4, and a perfusion apparatus 5.

[0011] As shown in FIG. 1, the endoscope device 2 includes an endoscope 21 and a first control device 22. 1, the endoscope 21 is inserted into the inside of the joint cavity C1 of the knee joint J1 through a first portal P1 that communicates between the inside of the joint cavity C1 and the outside of the skin, with the tip portion of the insertion section 211 being inserted into the inside of the joint cavity C1. The endoscope 21 then irradiates the inside of the joint cavity C1 with light, captures the illumination light (subject image) reflected inside the joint cavity C1, and captures the subject image. The first control device 22 executes various types of image processing on the captured image captured by the endoscope 21, and causes a display device (not shown) to display the captured image after the image processing.

[0012] As shown in FIG. 1, the treatment device 3 includes an ultrasonic treatment tool 6, a second control device 31, and a foot switch 32. 1, the second control device 31 is connected to the ultrasonic treatment tool 6 by an electric cable CB. The second control device 31 supplies driving power to the ultrasonic treatment tool 6 in response to an operator's operation of a foot switch 32. The supply of driving power is not limited to the operation of the foot switch 32, and may be performed in response to, for example, an operation of an operation unit (not shown) provided on the ultrasonic treatment tool 6.

[0013] The ultrasonic treatment tool 6 generates ultrasonic vibrations in response to the driving power supplied from the second control device 31. The tip of the ultrasonic treatment tool 6 is inserted into the joint cavity C1 while being guided by the guiding device 4 inserted into the joint cavity C1 through the second portal P2 that communicates between the inside of the joint cavity C1 and the outside of the skin. When ultrasonic vibrations are generated while the tip treatment section 731 (see FIG. 2), which is the tip of the ultrasonic treatment tool 6, is in contact with the treatment target part of the bone, the part of the bone that mechanically collides with the tip treatment section 731 is crushed into fine particles by a hammering action. When the surgeon presses the tip treatment section 731 into the treatment target part, the tip treatment section 731 advances into the treatment target part while crushing the bone. As a result, a bone hole having a cross-sectional shape corresponding to the cross-sectional shape of the tip treatment section 731 is formed in the treatment target part. The detailed configuration of the ultrasonic treatment device 6 will be described later in "Configuration of Ultrasonic Treatment Device."

[0014] The guiding device 4 is inserted into the joint cavity C1 through the second portal P2, and guides the insertion of the tip portion of the ultrasonic treatment instrument 6 into the joint cavity C1.

[0015] Here, the inside of the joint cavity C1 is filled with a perfusion fluid such as physiological saline. The perfusion fluid is delivered to the inside of the joint cavity C1 and discharged to the outside of the joint cavity C1 by a perfusion device 5. As shown in FIG. 1, the perfusion device 5 includes a liquid source 51, a fluid delivery tube 52, a fluid delivery pump 53, a drainage bottle 54, a drainage tube 55, and a drainage pump 56. Fluid source 51 contains irrigation fluid. The liquid supply tube 52 has one end connected to the liquid source 51 and the other end connected to the endoscope 21 . The fluid supply pump 53 supplies the perfusion fluid from the fluid source 51 to the endoscope 21 through the fluid supply tube 52. The perfusion fluid supplied to the endoscope 21 is then supplied into the joint cavity C1 from a fluid supply hole (not shown) formed in the tip portion of the insertion section 211.

[0016] The drainage bottle 54 stores the irrigation fluid that is drained to the outside of the joint cavity C1. The drainage tube 55 has one end connected to the guiding device 4 and the other end connected to the drainage bottle 54 . The drainage pump 56 drains the irrigation fluid from the inside of the joint cavity C1 into the drainage bottle 54 via a flow path from the guiding device 4 inserted inside the joint cavity C1 to the drainage tube 55.

[0017] [Configuration of ultrasonic treatment device] Next, the configuration of the ultrasonic treatment device 6 will be described. FIG. 2 is a diagram showing the ultrasonic treatment device 6. As shown in FIG. In describing the configuration of the ultrasonic treatment instrument 6, one side along the central axis Ax of the sheath 72 is referred to as a distal end side Ar1, and the other side is referred to as a proximal end side Ar2. As shown in FIG. 2, the ultrasonic treatment device 6 includes a blade unit 7 and a handle unit 8.

[0018] The blade unit 7 is provided on the distal end side Ar1 of the handle unit 8, and has a distal treatment part 731 which is an end effector for treating a treatment target part of a bone. As shown in FIG. 2, the blade unit 7 is a unit in which a blade cover 71, a sheath 72, and a blade 73 are integrated.

[0019] The blade cover 71 is configured by a cylindrical body that is coaxial with the central axis Ax, and is disposed at the end of the handle unit 8 on the tip side Ar1. The sheath 72 has a cylindrical shape extending along the central axis Ax, and is supported by the blade cover 71 with an end portion on the base end side Ar2 being inserted into the blade cover 71.

[0020] The blade 73 corresponds to the vibration transmission member according to the present invention. The blade 73 is made of, for example, a titanium alloy and has an elongated shape extending along the central axis Ax. The blade 73 is supported by the sheath 72 with an end of the base side Ar2 inserted into the inside of the sheath 72 and a tip side Ar1 protruding from the sheath 72 to the outside. The end of the base side Ar2 of the blade 73 is connected to the ultrasonic transducer 9 (see FIG. 3) housed inside the handle unit 8 with the blade unit 7 connected to the handle unit 8. The blade 73 transmits ultrasonic vibration generated by the ultrasonic transducer 9 from the base end to the tip. In this embodiment, the ultrasonic vibration is a longitudinal vibration along the longitudinal direction (direction along the central axis Ax) of the blade 73. The tip treatment section 731 is provided at the end of the tip side Ar1 of the blade 73 as shown in FIG. 2.

[0021] Fig. 3 is a diagram showing the internal structure of the handle unit 8. Specifically, Fig. 3 is a cross-sectional view of the handle unit 8 cut along a plane including the central axis Ax. As shown in FIG. 3, the handle unit 8 includes an ultrasonic transducer 9 and a handle member 10.

[0022] As shown in FIG. 3, the ultrasonic transducer 9 includes a piezoelectric element unit 91, an element mounting portion 92, a horn 93, a blade mounting portion 94, and a fastening portion 95. The piezoelectric element unit 91 is a part that generates ultrasonic vibrations. As shown in Fig. 3, the piezoelectric element unit 91 includes first and second electrode plates 911 and 912, a plurality of (four in this embodiment) piezoelectric elements 913, and two insulating plates 914 having electrical insulation properties.

[0023] The first and second electrode plates 911 and 912 are parts to which driving power is supplied from the second control device 31. As shown in FIG. 3, the first electrode plate 911 includes a plurality of (three in this embodiment) negative electrode plates 9111, a plurality of (two in this embodiment) negative electrode wiring portions (not shown), and a negative electrode terminal 9113. The negative electrode plates 9111 each have a disk shape with an opening 9111A (FIG. 3) in the center, and are arranged side by side along the central axis Ax. The negative electrode wiring portions are portions that electrically connect the outer edges of the negative electrode plates 9111 adjacent to each other. The negative electrode terminal 9113 extends toward the base end side Ar2 from the outer edge of the negative electrode plate 9111 located closest to the base end side Ar2 among the multiple negative electrode plates 9111. The negative electrode terminal 9113 is electrically connected to the second control device 31 via an electric cable CB.

[0024] As shown in FIG. 3, the second electrode plate 912 includes a plurality of positive electrode plates 9121 (two in this embodiment), a positive electrode wiring portion 9122 (one in this embodiment), and a positive electrode terminal 9123. The positive electrode plates 9121 each have a disk shape with an opening 9121A (FIG. 3) in the center, and are arranged side by side along the central axis Ax. The positive electrode plates 9121 have substantially the same shape as the negative electrode plates 9111. The negative electrode plates 9111 and the positive electrode plates 9121 are arranged alternately along the central axis Ax, as shown in FIG. The positive electrode wiring portion 9122 is a portion that electrically connects the outer edge portions of the adjacent positive electrode plates 9121 to each other. The positive electrode terminal 9123 extends from the outer edge of the positive electrode plate 9121 located closest to the base end side Ar2 among the multiple positive electrode plates 9121 toward the base end side Ar2. The positive electrode terminal 9123 is electrically connected to the second control device 31 via an electric cable CB. A driving voltage is supplied between the negative electrode terminal 9113 and the positive electrode terminal 9123 from the second control device 31.

[0025] Each of the piezoelectric elements 913 has a disk shape with an opening 9131 (FIG. 3) in the center, and is disposed between the negative electrode plate 9111 and the positive electrode plate 9121. That is, the piezoelectric elements 913 are stacked along the central axis Ax. In response to the driving power supplied to the first and second electrode plates 911 and 912, a potential difference is generated in the stacking direction along the central axis Ax, and the piezoelectric elements 913 generate piezoelectric characteristics, and alternately repeat displacements along the stacking direction. As a result, the piezoelectric element unit 91 generates ultrasonic vibration of a longitudinal vibration with the stacking direction as the vibration direction.

[0026] In this embodiment, the outer diameter of the piezoelectric element 913 is set to 17 mm or more and 30 mm or less. The outer diameter of the piezoelectric element 913 corresponds to the maximum outer diameter of the entire ultrasonic transducer 9. Furthermore, the length of the stacked piezoelectric elements 913 in the stacking direction is set to 15 mm or more and 30 mm or less.

[0027] The element mounting portion 92, the horn 93, and the blade mounting portion 94 are integrally formed members made of a metal material or the like. Specifically, the element mounting part 92 is a bolt extending linearly along the central axis Ax, and is inserted through each of the openings 9111A of the multiple negative electrode plates 9111, each of the openings 9121A of the multiple positive electrode plates 9121, and each of the openings 9131 of the multiple piezoelectric elements 913. Then, a fastening part 95, which is a nut made of a metal material or the like, is attached to the end of the base end side Ar2 of the element mounting part 92, as shown in FIG.

[0028] The horn 93 has a function of expanding the amplitude of ultrasonic vibration generated by the piezoelectric element unit 91. The horn 93 is provided at the end of the tip side Ar1 of the element mounting part 92, and has a substantially cylindrical shape extending linearly along the central axis Ax. As shown in FIG. 3, the end of the base side Ar2 of the horn 93 is set to have a larger diameter than the element mounting part 92. Therefore, the negative electrode plates 9111, the positive electrode plates 9121, and the piezoelectric elements 913 are clamped between the horn 93 and the fastening part 95 with the element mounting part 92 penetrating along the central axis Ax, and are fastened together in a substantially cylindrical shape. That is, the ultrasonic transducer 9 is composed of a bolt-clamped Langevin-type transducer. The insulating plate 914 is, They are respectively arranged between the horn 93 and the negative electrode plate 9111 located at the most distal end side Ar1 among the multiple negative electrode plates 9111, and between the fastening portion 95 and the negative electrode plate 9111 located at the most proximal end side Ar2 among the multiple negative electrode plates 9111.

[0029] As shown in FIG. 3, the horn 93 is provided with a flange portion 931. The flange portion 931 is a portion used for supporting the ultrasonic transducer 9 on the handle member 10. This flange portion 931 is provided at a node position PN (FIG. 3) of the ultrasonic vibration generated by the piezoelectric element unit 91. Here, the outer diameter of the flange portion 931 is set to be smaller than the outer diameter of the piezoelectric element 913, which is the maximum outer diameter of the ultrasonic transducer 9 as a whole.

[0030] 3, the blade attachment part 94 is provided at the end of the tip side Ar1 of the horn 93, and extends linearly along the central axis Ax. The end of the tip side Ar1 of the blade attachment part 94 is mechanically connected to the blade 73 by connecting the blade unit 7 to the handle unit 8.

[0031] The handle member 10 constitutes the exterior of the handle unit 8, and is a portion in which the ultrasonic transducer 9 is housed. The handle member 10 includes an outer member 11 and an inner member 12, as shown in FIG. The outer member 11 is made of a resin material, is a cylindrical body that is coaxial with the central axis Ax and extends linearly along the central axis Ax, and constitutes the exterior of the handle unit 8. The shape of the outer surface of the outer member 11 will be described later in the section "Shape of the outer surface of the outer member."

[0032] The inner member 12 is a cylindrical body that is coaxial with the central axis Ax and extends linearly along the central axis Ax. The inner member 12 is disposed inside the outer member 11, and houses the ultrasonic transducer 9 inside. The inner member 12 is made of a material having a larger heat capacity than the outer member 11. The inner member 12 is made of a material having a thermal conductivity of 80 W / (m·K) or more and 420 W / (m·K) or less. Examples of materials for the inner member 12 include aluminum, copper, graphite, and compounds thereof.

[0033] As shown in FIG. 3, the inner member 12 supports the ultrasonic transducer 9 via the support member 13 with the support member 13 sandwiched between the inner member 12 and the flange portion 931. Here, the support member 13 has a generally circular ring shape in which a small diameter portion 131 and a large diameter portion 132 are integrated.

[0034] The small diameter portion 131 has a generally annular shape whose inner diameter is smaller than the outer diameter of the flange portion 931 and whose outer diameter is set to be generally the same as the inner diameter of the inner member 12 . The large diameter portion 132 is integrally formed on the end surface of the base end side Ar2 of the small diameter portion 131, and has an approximately circular ring shape whose inner diameter dimension is approximately the same as the outer diameter dimension of the flange portion 931 and whose outer diameter dimension is set approximately the same as the inner diameter dimension of the inner member 12. In this embodiment, the support member 13 is divided into two bodies by a plane including the central axis Ax, and is composed of first and second support members 13A and 13B (FIG. 3) each having a semicircular arc shape in a cross section perpendicular to the central axis Ax, and sandwiching the horn 93. Examples of the material of the support member 13 described above include PEEK (polyether ether ketone), iron, carbon, and the like.

[0035] The inner member 12 described above is fixed to the outer member 11 as described below. The worker inserts the end of the base end side Ar2 of the inner member 12 into the outer member 11 and abuts it against a rib 111 (FIG. 3) provided on the end of the base end side Ar2 on the inner peripheral surface of the outer member 11. Note that a plurality of ribs 111 are provided around the central axis Ax on the inner peripheral surface of the outer member 11, but only one rib 111 is shown in FIG. 3. After that, the worker attaches an annular cap member CP (FIG. 3) to the end of the tip side Ar1 of the outer member 11, and fixes the inner member 12 to the outer member 11 by sandwiching the inner member 12 between the cap member CP and the plurality of ribs 111. In this state, as shown in FIG. 3, a gap is formed between the inner peripheral surface of the outer member 11 and the outer peripheral surface of the inner member 12.

[0036] Moreover, the support member 13 is fixed between the flange portion 931 and the inner member 12 in the state described below. The large diameter portion 132 of the support member 13 is disposed between the flange portion 931 and the inner member 12. The small diameter portion 131 of the support member 13 is inserted into the inner member 12 and is sandwiched between the flange portion 931 and a rubber member RB (FIG. 3) that is pressed toward the base end side Ar2 from the cap member CP.

[0037] [Shape of outer surface of outer member] Next, the shape of the outer surface of the outer member 11 will be described. Fig. 4 to Fig. 7 are diagrams for explaining the shape of the outer surface of the outer member 11. Specifically, Fig. 4 is a diagram of the outer member 11 as viewed from a direction perpendicular to the central axis Ax. Fig. 5 is a cross-sectional view taken along line VV in Fig. 4. Fig. 6 is a cross-sectional view taken along line VI-VI in Fig. 4. Fig. 7 is a diagram showing an example of how to grip the ultrasonic treatment tool 6. As shown in FIG. 4, the outer member 11 comprises a tip portion 112 located on a tip side Ar1, an outer member main body 113 connected to a base side Ar2 of the tip portion 112 and extending from the tip portion 112 to the base side Ar2, and a base end portion 114 connected to the base side Ar2 of the outer member main body 113.

[0038] Here, the outer surface of the base end 114 is provided with a plurality of protrusions 115 that are equally spaced around the central axis Ax, each protruding from the outer surface of the base end 114 and each extending linearly along the central axis Ax.

[0039] As shown in Figures 4 to 7, the outer surface of the outer member main body 113 is provided with a plurality of (six in this embodiment) arc portions 1131 and a plurality of (six in this embodiment) protrusions 1132. 5 and 6, the multiple arc portions 1131 each have an arc shape centered on the central axis Ax at an end face perpendicular to the central axis Ax, and each extend along the central axis Ax. In this embodiment, the multiple arc portions 1131 have the same length dimension around the central axis Ax (length dimension of the arc). In addition, the multiple arc portions 1131 also have the same length dimension in the direction along the central axis Ax.

[0040] 5 and 6, the multiple protrusions 1132 are arranged alternately with the arc portions 1131 around the central axis Ax, protrude radially outward of the outer member 11 beyond the arc portions 1131 in a cross section perpendicular to the central axis Ax, and extend along the central axis Ax. In this embodiment, the multiple protrusions 1132 have the same cross-sectional shape perpendicular to the central axis Ax. The multiple protrusions 1132 also have the same length dimension in the direction along the central axis Ax. As shown in Figures 5 and 6, the multiple protrusions 1132 described above each form the apex of a virtual polygon VP (a regular hexagon in this embodiment) centered on the central axis Ax in a cross section perpendicular to the central axis Ax.

[0041] Further, a protruding dimension DA of each of the plurality of protrusions 1132 protruding radially outward from the arcuate portion 1131 of the outer member 11 gradually decreases from the tip to the base end of the outer member 11 as shown in FIGS. Furthermore, the diameter of an imaginary circle VC (FIGS. 5 and 6) connecting the tips of the multiple convex portions 1132 is set to be 28 mm or more and 40 mm or less.

[0042] As shown in FIG. 7, the ultrasonic treatment instrument 6 is held, for example, in a gripped state by the entire hand H0 of the surgeon, and is held by the fingertips of the thumb F1, index finger F2, and middle finger F3 of the hand H0 at the tip side Ar1 of the outer member main body 113.

[0043] According to the present embodiment described above, the following effects are achieved. In the ultrasonic treatment tool 6 according to the present embodiment, the handle member 10 in which the ultrasonic transducer 9 is housed includes an outer member 11 and an inner member 12 that is disposed inside the outer member 11 and houses the ultrasonic transducer 9 therein. That is, the handle member 10 has a double structure. The inner member 12 is made of a material such as aluminum that has a larger heat capacity than the outer member 11. Therefore, heat generated in the ultrasonic transducer 9 is conducted to the inner member 12 and stored in the inner member 12. That is, it is possible to suppress the heat conduction from the ultrasonic transducer 9 to the outer member 11, which is the exterior. In addition, since the handle member 10 has a double structure, the heat conduction to the outer member 11 is suppressed, so there is no need to provide a heat dissipation fin with a large height dimension on the outer surface of the handle member 10 as in the past. That is, it is possible to avoid increasing the diameter of the handle member 10. Therefore, according to the ultrasonic treatment device 6 of the present embodiment, it is possible to sufficiently deal with the heat generated in the ultrasonic transducer 9, while preventing the handle member 10 held by the surgeon from becoming large in diameter. In particular, a gap is provided at least partially between the inner circumferential surface of the outer member 11 and the outer circumferential surface of the inner member 12. Therefore, an air layer existing in the gap serves as a heat insulating layer, and heat conduction from the inner member 12 to the outer member 11 can be effectively suppressed.

[0044] In the ultrasonic treatment device 6 according to the present embodiment, the outer diameter of the flange portion 931 is set to be smaller than the maximum outer diameter of the entire ultrasonic transducer 9. Between the flange portion 931 and the inner member 12, a support member 13 made of PEEK or the like is provided. That is, the vibration is less likely to be transmitted to the outer member 11 by reducing the diameter of the flange portion 931, and the vibration damping effect can be enhanced by providing the support member 13 on the vibration transmission path from the flange portion 931 to the outer member 11. Therefore, it is possible to adequately deal with the vibration of the handle member 10 held by the surgeon.

[0045] In the ultrasonic treatment device 6 according to the present embodiment, the outer surface of the outer member 11 is provided with a plurality of arcuate portions 1131 and a plurality of convex portions 1132 each formed by combining a circle and a regular hexagon in a cross section perpendicular to the central axis Ax. The protrusion dimension DA gradually decreases from the tip to the base end of the outer member 11. This improves the sense of fit when the surgeon grasps the outer member 11, and makes it possible to realize a shape that is easy to grasp. In particular, the diameter of an imaginary circle VC connecting the tips of the multiple convex portions 1132 is 28 mm or more and 40 mm or less. This corresponds to the range of 30 mm to 40 mm, which is known as a thickness that is easy for humans to grip. Therefore, even with this diameter, it is possible to realize a shape that makes it easy for the surgeon to grip the outer member 11.

[0046] In the ultrasonic treatment tool 6 according to the present embodiment, the outer diameter of the piezoelectric element 913 is 17 mm or more and 30 mm or less. In the ultrasonic transducer 9, four piezoelectric elements 913 are laminated. Therefore, the ultrasonic transducer 9 does not become large, and therefore the outer member 11 can be made to have a shape that is easy to grip, while achieving high output.

[0047] (Other embodiments) Although the embodiments for carrying out the present invention have been described above, the present invention should not be limited to the above-described embodiments. In the above-described embodiment, the present invention is applied to the ultrasonic treatment instrument 6 for removing or cutting biological tissue such as bone, but the present invention is not limited to this and may be applied to an ultrasonic treatment instrument for sealing or cutting biological tissue such as blood vessels. In the above-described embodiment, a regular hexagon is used as the virtual polygon VP, but a polygon other than a regular hexagon may be used. In the above-described embodiment, when cleaning the mounting portion on the handle unit 8 side when the blade unit 7 is removed, a U-shaped brush may be used to effectively clean the step in the mounting portion having a step. [Explanation of symbols]

[0048] 1 Treatment System 2 Endoscopic equipment 3 Treatment device 4 Guiding Devices 5 Perfusion device 6 Ultrasonic treatment tools 7 Blade Unit 8 Handle unit 9. Ultrasonic Transducer 10 Handle member 11 Outer member 12 Inner member 13 Support member 13A First Support Member 13B Second support member 21 Endoscopy 22 First control device 31 Second control device 32 Foot Switch 51 Liquid Source 52 Liquid delivery tube 53 Liquid delivery pump 54 Drainage bottle 55 Drainage tube 56 Drainage pump 71 Blade Cover 72 Sheath 73 Blade 91 Piezoelectric element unit 92 Element mounting part 93 Horn 94 Blade attachment part 95 Fastening Part 111 Rib 112 Tip 113 Outer component body 114 Proximal end 115 Protrusion 131 Small diameter section 132 Large diameter section 211 Insertion part 731 Tip treatment section 911 First electrode plate 912 Second electrode plate 913 Piezoelectric element 914 Insulating plate 931 Flange part 1131 Arc section 1132 Convex 9111 Negative electrode plate 9111A Aperture 9113 Negative electrode terminal 9121 Positive electrode plate 9121A Aperture 9122 Positive electrode wiring part 9123 Positive electrode terminal 9131 Aperture Ar1 Tip side Ar2 Base end Ax center axis C1 joint cavity CB Electric Cable CP Cap Parts DA protruding dimension F1 Thumb F2 index finger F3 middle finger H0 Hand J1 Knee joint P1 First Portal P2 The second portal PN node position RB Rubber Parts VC Virtual Circle

Claims

1. an ultrasonic transducer that generates ultrasonic vibrations; a handle member in which the ultrasonic transducer is housed; a vibration transmission member connected to the ultrasonic transducer and transmitting ultrasonic vibrations generated by the ultrasonic transducer; The handle member includes: An outer member forming an exterior; an inner member disposed inside the outer member and housing the ultrasonic transducer therein; The inner member is The ultrasonic treatment device is made of a material having a larger heat capacity than the outer member.

2. The ultrasonic transducer includes: a flange portion used to support the ultrasonic transducer on the handle member; Between the flange portion and the inner member, 2. The ultrasonic treatment device according to claim 1, further comprising a support member.

3. At least a portion of the outer surface of the outer member has a plurality of arcuate portions each having an arc shape centered on the central axis in a cross section perpendicular to the central axis of the outer member, the arcuate portions each extending along a longitudinal direction of the outer member; a plurality of protrusions are provided, the protrusions being arranged alternately with the arc portions about the central axis, protruding radially outwardly of the outer member beyond the arc portions in a cross section perpendicular to the central axis, and extending along a longitudinal direction of the outer member; The plurality of protrusions are 2. The ultrasonic treatment device according to claim 1, wherein, in a cross section perpendicular to the central axis, each of the first and second electrodes constitutes an apex of an imaginary polygon having a center on the central axis.

4. A protruding dimension of each of the plurality of convex portions protruding radially outward from the arc portion of the outer member is The ultrasonic treatment device according to claim 3, wherein the diameter of the outer member becomes smaller from the tip end to the base end.

5. The diameter of an imaginary circle connecting the tips of the plurality of protrusions is 4. The ultrasonic treatment device according to claim 3, wherein the diameter is 28 mm or more and 40 mm or less.

6. The inner member is 2. The ultrasonic treatment device according to claim 1, which is made of metal.

7. At least a portion between the outer member and the inner member is provided with 2. The ultrasonic treatment device according to claim 1, wherein a gap is provided.

8. The ultrasonic transducer includes: A plurality of piezoelectric elements are stacked along a longitudinal direction of the ultrasonic transducer, The outer diameter of the piezoelectric element is:

2. The ultrasonic treatment device according to claim 1, wherein the diameter is 17 mm or more and 30 mm or less.

9. The ultrasonic transducer includes: A plurality of piezoelectric elements are stacked along a longitudinal direction of the ultrasonic transducer, The length dimension in the stacking direction of the plurality of stacked piezoelectric elements is 2. The ultrasonic treatment device according to claim 1, wherein the diameter is 15 mm or more and 30 mm or less.

10. The thermal conductivity of the inner member is 2. The ultrasonic treatment device according to claim 1, wherein the intensity is 80 W / (m·K) or more and 420 W / (m·K) or less.

11. The ultrasonic transducer includes: a flange portion used to support the ultrasonic transducer on the handle member; The outer diameter of the flange portion is The ultrasonic treatment device according to claim 1 , wherein the outer diameter is smaller than the maximum outer diameter of the entire ultrasonic transducer.

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