WO2019123532A1

WO2019123532A1 - Heat treatment tool

Info

Publication number: WO2019123532A1
Application number: PCT/JP2017/045526
Authority: WO
Inventors: 庸高銅
Original assignee: オリンパス株式会社
Priority date: 2017-12-19
Filing date: 2017-12-19
Publication date: 2019-06-27

Abstract

In this heat treatment tool, a plate thereof is provided with: a treatment surface for making contact with a to-be-treated object; and a back surface on the opposite side to the treatment surface, and is formed from an electrically conductive metal. A heater for generating heat is attached to the back surface of the plate, and the heat generated in the heater is transmitted toward the treatment surface through the plate. An oxide film is formed on at least a part of the back surface of the plate from an oxide obtained by oxidizing the metal forming the plate, and the oxide film has electric insulation properties.

Description

Heat treatment tool

The present invention relates to a thermal treatment tool that treats a treatment target using heat generated by a heater.

WO 2016/189713 A1 discloses a thermal treatment tool capable of gripping an object to be treated between a pair of gripping pieces. In this heat treatment tool, one of the grip pieces is provided with a plate formed of a conductive metal, and the plate has a treatment surface to be brought into contact with the treatment object to be grasped, and a back surface opposite to the treatment surface And. A heater is attached to the back of the plate, and the heater generates heat by being supplied with electrical energy. The heat generated by the heater is transmitted to the treatment surface through the plate and applied from the treatment surface to the object to be grasped.

In a heat treatment tool such as WO 2016/189713 A1, it is required that the electrical insulation and voltage resistance between the plate and the heater attached to the back of the plate be properly maintained.

The object of the present invention is to apply heat generated by the heater to the treatment target from the treatment surface of the plate, and to provide a heat treatment that ensures adequate electrical insulation and voltage resistance between the plate and the heater. To provide tools.

In order to achieve the above object, the heat treatment device according to an embodiment of the present invention is provided with a heater that generates heat by being supplied with electric energy, a treatment surface to be brought into contact with the treatment target, and the opposite side to the treatment surface. A plate formed of a conductive metal, the heater being attached to the back surface, the plate transmitting the heat generated by the heater toward the treatment surface; And an oxide film formed on at least a part of the back surface of the plate, wherein the metal forming the plate is formed of an oxidized oxide and has an electrical insulating property.

FIG. 1 is a schematic view showing a treatment system according to the first embodiment. FIG. 2 is a schematic view showing the distal end portion and the end effector of the shaft according to the first embodiment. FIG. 3 is a cross-sectional view schematically showing the end effector according to the first embodiment in a cross section perpendicular or substantially perpendicular to the longitudinal direction. FIG. 4: is sectional drawing which shows roughly the attachment structure of the heater to the plate which concerns on 1st Embodiment. FIG. 5 is a cross-sectional view schematically showing the configuration of the boundary between the oxide film and the adhesive layer of the plate according to the first embodiment and the vicinity thereof.

First Embodiment
A first embodiment of the present invention will be described with reference to FIGS. 1 to 5. FIG. 1 shows a treatment system 1 of the present embodiment. As shown in FIG. 1, the treatment system 1 includes a heat treatment tool 2 and a power supply 3. The heat treatment tool 2 is removably connected to the power supply 3 via the cable 5. The heat treatment tool 2 includes a cylindrical shaft (sheath) 6, a holdable housing 7, and an end effector 8. The shaft 6 has a longitudinal axis C as a central axis. Here, one side in the direction along the longitudinal axis C is referred to as a tip side (arrow C1 side), and the side opposite to the tip side is referred to as a base end side (arrow C2 side). The shaft 6 is extended from the proximal side to the distal side along the longitudinal axis C, and the housing 7 is connected to the proximal side of the shaft 6. Further, the end effector 8 is connected to the distal end side of the shaft 6 and extends from the distal end portion of the shaft 6 toward the distal end side. The end effector 8 is extended along the longitudinal direction of the end effector 8 from the proximal end to the distal end.

The housing 7 is provided with a grip 11 extending along a direction intersecting the longitudinal axis C. Further, the handle 12 is rotatably attached to the housing 7. The handle 12 pivots relative to the housing 7 such that the handle 12 opens or closes relative to the grip 11. In the present embodiment, one end of the cable 5 is connected to the housing 7. The other end of the cable 5 is removably connected to the power supply 3. Further, an operating device 10 such as a foot switch is electrically connected to the power supply device 3. In the controller device 10, an operation for causing the heat treatment device 2 to output electrical energy from the power supply device 3 is input. In one embodiment, instead of providing the operating device 10 separately from the heat treatment device 2, or in addition to the operation device 10 separate from the heat treatment device 2, the housing 7 of the heat treatment device 2 etc. The operation button etc. which are attached to are provided as an operating device. Then, an operation for outputting electrical energy from the power supply device 3 to the heat treatment device 2 is input by the operating device attached to the heat treatment device 2.

FIG. 2 shows the configuration of the tip of the shaft 6 and the end effector 8, and FIG. 3 shows the configuration of the end effector 8. As shown in FIGS. 1 to 3, the end effector 8 includes a pair of jaws (gripping pieces) 15 and 16. Each of the

jaws

15 and 16 extends continuously from the proximal end to the distal end of the end effector 8 in the longitudinal direction of the end effector 8. The pair of

jaws

15, 16 can be opened and closed relative to each other. In one embodiment, one of the

jaws

15, 16 is integral with or fixed to the shaft 6, and the other of the

jaws

15, 16 is pivotally attached to the shaft 6. In another embodiment, both of the

jaws

15, 16 are pivotally attached to the shaft 6. The opening / closing direction of the end effector 8 (the direction indicated by the arrow Y1 and the arrow Y2), that is, the moving direction of the

jaws

15 and 16 in the opening operation and closing operation of the end effector 8 intersects the longitudinal direction of the end effector 8 (Vertical or nearly vertical).

Here, in the end effector 8, the width intersects (vertically or substantially perpendicularly) with the longitudinal direction, and intersects (vertically or substantially perpendicular) with the opening / closing direction (direction indicated by the arrow Y1 and the arrow Y2) The direction (direction indicated by the arrow W1 and the arrow W2) is defined. In FIG. 2, a part of the jaws 16 is shown in a cross section perpendicular or substantially perpendicular to the width direction. FIG. 3 also shows the end effector 8 in a cross section perpendicular or substantially perpendicular to the longitudinal direction. Each of the

jaws

15 and 16 has a dimension in the longitudinal direction of the end effector 8 much larger than that in the opening / closing direction of the end effector 8. Each of the

jaws

15 and 16 has a dimension in the longitudinal direction of the end effector 8 much larger than that in the width direction of the end effector 8.

Inside the housing 7, the proximal end of the movable member 17 is connected to the handle 12. The movable member 17 is movable along the longitudinal axis C with respect to the shaft 6 and the housing 7. The tip of the movable member 17 is connected to at least one of the

jaws

15 and 16. Opening or closing the handle 12 relative to the grip 11 causes the movable member 17 to move along the longitudinal axis C. This causes at least one of the

jaws

15, 16 to pivot and the

jaws

15, 16 to open or close relative to one another. By closing the

jaws

15 and 16 with respect to each other, it becomes possible to grasp a treatment target such as a living tissue between the

jaws

15 and 16. In one embodiment, an operating member such as a rotation knob is attached to the housing 7. Then, when an operation is input by the operation member, the end effector 8 and the shaft 6 together rotate around the longitudinal axis C with respect to the housing 7.

In another embodiment, the housing 7 is provided with an operating member such as a dial, and the end effector 8 bends or curves with respect to the shaft 6 and the longitudinal axis C in response to the operation by the operating member. In this embodiment, a relay member (not shown) provided on the end effector 8 is bendably or bendably attached to the shaft 6. And one of the

jaws

15 and 16 is rotatably attached to the relay member. The other of the

jaws

15 and 16 may be integral with the relay member or may be fixed to the relay member, or may be rotatably attached to the relay member.

In the present embodiment, one jaw (gripping piece) 15 includes a holder 21 and an electrode member 22. Each of the holder 21 and the electrode member 22 is continuously extended from the proximal end to the distal end of the jaw 15 in the longitudinal direction of the end effector 8. The holder 21 is formed of, for example, a resin or the like having heat resistance and electrical insulation. Moreover, in one embodiment, the holder 21 may be formed by coating a core material such as metal with a resin by insert molding or the like. The electrode member 22 is formed of a conductive material such as a conductive metal.

The jaw 15 includes a gripping surface (facing surface) 23 facing the other jaw 16 and a back surface 25 facing away from the gripping surface 23. Each of the gripping surface 23 and the back surface 25 is continuously extended from the proximal end to the distal end of the jaw 15 in the longitudinal direction of the end effector 8. In the present embodiment, the holding surface 23 is formed by the holder 21 and the electrode member 22, and the back surface 25 is formed by the holder 21. When the treatment target is gripped between the

jaws

15 and 16, the treatment target contacts the gripping surface 23. The gripping surface 23 is provided with an abutment surface 26 against which the jaws 16 can rest with the

jaws

15, 16 closed relative to one another. The abutment surface 26 is formed by the holder 21 and is formed of a material having electrical insulation. In the present embodiment, the abutment surface 26 is continuously extended from the proximal end to the distal end of the jaw 15 in the longitudinal direction of the end effector 8, and the central portion of the jaw 15 in the width direction of the end effector 8 Is formed. Further, on the gripping surface 23, the electrode members 22 are disposed on both sides of the contact surface 26 in the width direction of the end effector 8.

The other jaw 16 comprises a plate (blade) 31, a heater 32, a holder 33, a closing member 35, a base 36 and a frame 37. The plate 31, the heater 32, the holder 33, the closing member 35, the base 36, and the frame 37 are continuously extended from the proximal end to the distal end of the jaw 16 in the longitudinal direction of the end effector 8. Ru. Further, the jaw 16 includes a treatment surface (facing surface) 41 facing the gripping surface 23 and a back surface 42 facing the opposite side to the treatment surface 41. Each of the treatment surface (gripping surface) 41 and the back surface 42 is continuously extended from the proximal end to the distal end of the jaw 16 in the longitudinal direction of the end effector 8. In the present embodiment, the treatment surface 41 is formed by the plate 31, and the back surface 42 is formed by the frame 37. For this reason, in the present embodiment, the jaws 15 face the treatment surface 41 of the plate 31. The jaws (gripping pieces) 15 can be opened and closed with respect to the plate 31. When the treatment target is held between the

jaws

15 and 16, the treatment target contacts the treatment surface 41.

The plate 31 is formed of a conductive metal or the like, and is formed of a material having high heat transferability (thermal conductivity). In one embodiment, the plate 31 is formed of a metal containing aluminum, such as an aluminum alloy material, and has a thermal conductivity of, for example, about 120 W / (m · K) to 130 W / (m · K). Further, the plate 31 is formed with a projection 43 projecting toward the jaw 15 side. In the projection 43, the treatment surface 41 protrudes to the jaw 15 side as compared with the portion other than the projection 43. In the present embodiment, the protrusion 43 is continuously extended from the proximal end to the distal end of the jaw 16 (plate 31) in the longitudinal direction of the end effector 8, and in the width direction of the end effector 8. It is formed in the center. The projections 43 may be sharp or dull.

In the treatment surface 41,

inclined surfaces

45A and 45B are formed on both sides of the protrusion 43 in the width direction of the end effector 8. The inclined surfaces 45A, 45B are formed by the plate 31 and extend continuously from the proximal end to the distal end of the jaw 16 (plate 31) in the longitudinal direction of the end effector 8. Each of the

inclined surfaces

45A and 45B inclines in a state in which the jaws 16 open in the width direction as the distance from the projection 43 is increased. With the

jaws

15 and 16 closed relative to one another, the treatment surface 41 of the plate 31 abuts the projection 43 on the abutment surface 26 of the jaw 15. However, even when the plate 31 is in contact with the contact surface 26, the plate 31 is located apart from the electrode member 22 of the jaw 15 and does not contact the electrode member 22. For this reason, the contact with respect to each other of the plate 31 and the electrode member 22 is effectively prevented.

The plate 31 has a back (plate back) 46 opposite to the treatment surface 41. The heater 32 is attached to the back 46 of the plate 31. The back surface 46 extends continuously from the proximal end to the distal end of the jaw 16 in the longitudinal direction of the end effector 8. In the present embodiment, the back surface 46 is formed with a recess 47 that is recessed toward the treatment surface 41 side. In the jaw 16, the recess 47 forms a cavity 48. The recess 47 has a bottom surface 51 and

side surfaces

52A and 52B. The heater 32 is attached to the bottom surface 51 of the recess 47 and disposed in the cavity 48. The bottom surface 51 of the recess 47 faces the side where the jaws 16 are open, and each of the side surfaces 52A, 52B faces inward in the width direction of the end effector 8. In the present embodiment, the recess 47 is continuously extended from the proximal end to the distal end of the jaw 16 (plate 31) in the longitudinal direction of the end effector 8, and in the width direction of the end effector 8. It is formed in the center. The heater 32 attached to the bottom surface 51 of the recess 47 is disposed at the center of the jaw 16 in the width direction of the end effector 8. Further, in the present embodiment, the dimension of the heater 32 in the width direction of the end effector 8 is smaller than the dimension of the bottom surface 51 in the width direction of the end effector 8. Therefore, the heater 32 is disposed apart from the side surfaces 52A and 52B of the recess 47 in the width direction of the end effector 8, and the heater 32 does not contact the side surfaces 52A and 52B.

Further, in the plate 31, engaging

claws

53A and 53B are formed on both sides of the recess 47 in the width direction of the end effector 8. In the present embodiment, the engaging

claws

53A and 53B are continuously extended from the proximal end to the distal end of the jaw 16 (plate 31) in the longitudinal direction of the end effector 8. The engagement claw 53A is provided at one end of the plate 31 in the width direction of the end effector 8, and the engagement claw 53B is provided at the other end of the plate 31 in the width direction of the end effector 8. In the plate 31, each of the engaging

claws

53A, 53B protrudes toward the side where the jaws 16 are opened. In one embodiment, each of the

engagement claws

53A and 53B may be formed intermittently in the longitudinal direction of the end effector 8.

In the present embodiment, when an operation is input by the operating device 10, DC power or AC power is output from the power supply device 3 to the heater 32 as electric energy. By supplying electric energy to the heater 32, the electric energy is converted to heat energy in the heater 32 due to the electric resistance of the heater 32, and heat is generated. The heat generated by the heater 32 is transmitted through the plate 31 toward the treatment surface 41. In the state where the treatment object is held between the

jaws

15 and 16, the electric energy is supplied to the heater 32, whereby the heat generated by the heater 32 is applied from the treatment surface 41 to the treatment object. In one embodiment, when the treatment target is solidified (sealed) by the heat of the heater 32, the temperature of the heater 32 is controlled to about 110 ° C., and the temperature of the treatment surface 41 is set to about 100 ° C. Then, when the treatment target is incised by the heat of the heater 32, the temperature of the heater 32 is controlled to about 320 ° C. to 330 ° C., and the temperature of the treatment surface 41 is set to about 300 ° C.

Further, in the present embodiment, when an operation is input by the operating device 10, high-frequency power is output from the power supply device 3 to the electrode member 22 and the plate 31 as electric energy different from electric energy to the heater 32. Thereby, the electrode member 22 and the plate 31 function as electrodes having different potentials with respect to each other. In a state in which the treatment object is held between the

jaws

15 and 16, electric energy is supplied to the electrode member 22 and the plate 31 to cause high frequency current to flow through the treatment object held between the plate 31 and the electrode member 22. Flows and a high frequency current is applied to the treatment subject. That is, the high frequency current can be applied to the treatment target.

The holder 33 supports the plate 31 from the back surface 46 side, that is, the side from which the jaws 16 are opened. Therefore, the holder 33 is attached to the plate 31 from the back surface 46 side. In the present embodiment, the holder 33 is attached to the plate 31 by the engagement of the engaging

claws

53A and 53B of the plate 31 with the holder 33. For this reason, the close contact surface 55A in close contact with the holder 33 is formed in the engagement claw 53A, and the close contact surface 55B in close contact with the holder 33 is formed in the engagement claw 53B. Here, the space between each of the

close contact surfaces

55A and 55B and the holder 33 is kept liquid tight. Therefore, the penetration of liquid from the outside of the jaws 16 into the cavity 38 in which the heater 32 is disposed is effectively prevented through the space between the plate 31 and the holder 33.

The holder 33 is made of, for example, a thermoplastic resin, has heat resistance and electrical insulation, and has low heat conductivity (heat conductivity). Therefore, the holder 33 has lower heat conductivity than the plate 31. Examples of the thermoplastic resin forming the holder 33 include liquid crystal polymer (LCP), polyetheretherketone (PEEK), perfluoroalkoxyalkane (PFA), polytetrafluoroethylene (PTFE), polyimide (PI) and polybenzimidazole (PBI). Etc. are mentioned. In one embodiment, the holder 33 is formed by insert molding (injection molding) the above-described thermoplastic resin on the plate 31. In the state where the treatment target is incised by the heat generated by the heater 32, as described above, the temperature of the treatment surface 41 becomes about 300.degree. From this point of view, the thermoplastic resin forming the holder 33 is preferably PEEK or LCP which has a melting point higher than 300 ° C. and does not soften to a deformable degree at temperatures of 300 ° C. and its vicinity.

In the present embodiment, the holder 33 is formed with a through hole 57 penetrating the holder 33 in the opening / closing direction of the end effector 8. The through hole 57 extends continuously from the proximal end to the distal end of the jaw 16 (holder 33) in the longitudinal direction of the end effector 8, and is formed in the central portion of the jaw 16 in the width direction of the end effector 8. Be done. The end of the through hole 57 on the treatment surface 41 side is continuous with the cavity 48 formed by the recess 47.

In the jaw 16, the closing member 35 is disposed in the through hole 57. The closing member 35 is formed of a material having heat resistance and electrical insulation, and low heat conductivity (heat conductivity). Therefore, the closing member 35 has lower heat conductivity than the plate 31. As a material which forms the closure member 35, the thermoplastic resin mentioned above and ceramics etc. are mentioned, for example. The closing member 35 may be formed of the same material as the holder 33, or may be formed of a material different from the holder 33. In the through hole 57, the holder 33 abuts on the closing member 35 from both sides in the width direction of the end effector 8, and the closing member 35 is sandwiched by the holder 33. The opening of the through hole 57 is closed by the closing member 35 at the end on the back surface 42 side of the through hole 57, that is, the end of the through hole 57 on the opposite side to the treatment surface 41. In the through hole 57, the movement of the closing member 35 with respect to the holder 33 is restricted. In the cavity 48, the heater 32 is disposed away from the closing member 35 toward the treatment surface 41, and a clearance is formed between the heater 32 and the closing member 35.

Further, in the jaw 16, the base 36 is in close contact with the holder 33 and the closing member 35 from the side where the jaw 16 is opened, that is, the back surface 42. The base 36 is formed of, for example, the above-mentioned thermoplastic resin, has heat resistance and electrical insulation, and has low heat conductivity (heat conductivity). Therefore, the base 36 has lower heat conductivity than the plate 31. The base 36 is preferably formed of the same material as the holder 33. In one embodiment, the base 36 inserts the above-mentioned thermoplastic resin in a state where the heater 32 is attached to the back surface 46 of the plate 31 and the opening of the through hole 57 of the holder 33 is closed by the closing member 35 It is formed by molding (injection molding). In the jaw 16, the space between the holder 33 and the base 36 and the space between the closing member 35 and the base 36 are kept fluid tight. Therefore, it is effective that the liquid penetrates from the outside of the jaw 16 into the cavity 38 in which the heater 32 is disposed, either through the holder 33 and the base 36 and / or between the closing member 35 and the base 36. It is prevented.

Further, in the jaw 16, the frame 37 is attached to the base 36 from the back surface 42 side. The frame 37 is formed of, for example, metal or the like. In addition, it is preferable that the exposed portion of the frame 37 including the back surface 42 be provided with a coating having electrical insulation. In the present embodiment, the frame 37 is in contact with the base 36 from the back surface 42 side. However, in one embodiment, a space is formed between the frame 37 and the base 36. In addition, the frame 37 may not be provided as long as an appropriate gripping force can be applied to the treatment object between the

jaws

15 and 16 without excessive deformation of the holder 33 or the like.

Further, in the present embodiment, the coating layer 58 is formed on the treatment surface 41 of the plate 31. The coating layer 58 is formed of a material containing a resin, and is formed of a mixture of conductive metal powder mixed with a fluorine-based resin. Examples of the fluorine-based resin forming the coating layer 58 include PTFE, and examples of the metal powder mixed with the fluorine-based resin include silver and copper. The coating layer 58 has conductivity by mixing the conductive metal powder. For this reason, high frequency current can be applied to the treatment target from the treatment surface 41 of the plate 31 through the coating layer 58. In addition, by forming the coating layer 58 from a fluorine-based resin, sticking of the treatment target to the treatment surface 41 is effectively prevented. The coating layer 58 may be formed on at least a part of the treatment surface 41. However, the coating layer 58 is preferably formed over the entire or substantially the entire treatment surface 41.

FIG. 4 is a view showing the mounting structure of the heater 32 on the plate 31. As shown in FIG. As shown in FIG. 4, the heater 32 includes a heater substrate 61 and a heater wire 62 formed on the heater substrate 61. The heater wire 62 is formed on the side of the heater substrate 61 facing the plate 31. The heater wire 62 is formed of, for example, a conductive material such as stainless steel, platinum and tungsten. The heater substrate 61 is formed of a material having electrical insulation and heat resistance. Examples of the material for forming the heater substrate 61 include resins such as polyimide, and highly heat-resistant insulating materials such as aluminum nitride, aluminum oxide, glass, and zirconia. Each of the heater substrate 61 and the heater wire 62 extends continuously from the proximal end to the distal end of the jaw 16 in the longitudinal direction of the end effector 8. And in the state where electric energy is supplied to heater 32 (heater wire 62), calorific value becomes uniform or almost uniform over the whole of heater wire 62.

The heater 32 is attached to the back surface 46 of the plate 31 by an adhesive layer 63 such as an adhesive sheet. For this reason, in the jaw 16, the adhesive layer 63 is provided between the back surface 46 of the plate 31 and the heater 32. The adhesive layer 63 is in close contact with the back surface 46 of the plate 31 from the side where the heater 32 is located. The adhesive layer 63 is formed of a resin having electrical insulation and heat resistance. Further, the resin forming the adhesive layer 63 has a melting point higher than 300 ° C., and does not soften to a deformable degree at a temperature of 300 ° C. and its vicinity. In one embodiment, the adhesive layer 63 is formed of a mixture of a resin having electrical insulation and high thermal conductivity as a filler in a resin. In this case, as the resin, epoxy, polyurethane and the like can be mentioned, and as ceramics to be the filler, boron nitride, aluminum nitride and the like can be mentioned. By mixing the ceramic having high thermal conductivity with the resin, the thermal conductivity in the adhesive layer 63 is improved as compared with the case where the ceramic is formed only from the resin. When the adhesive layer 63 is formed of a mixture of ceramics and a resin, the thermal conductivity of the adhesive layer 63 is, for example, about 3 W / (m · K) to 5 W / (m · K). Further, in one embodiment, the adhesive layer 63 is formed to have a thickness of about several μm.

Further, in the plate 31, the oxide film 65 is formed in the concave portion 47 of the back surface 46. The oxide film 65 is formed of an oxide of the metal forming the plate 31. For example, in the embodiment in which the metal forming the plate 31 contains aluminum, the oxide film 65 is formed of aluminum oxide. Since the oxide film 65 of aluminum oxide is formed of a metal oxide containing aluminum, it has electrical insulation. In the present embodiment, the oxide film 65 is formed over the entire surface or substantially the entire surface of the recess 47 including the bottom surface 51 and the side surfaces 52A and 52B. For this reason, on the back surface 46 of the plate 31, the oxide film 65 is formed on both the portion to which the heater 32 is attached and the portion other than the portion to which the heater 32 is attached. In the present embodiment, the adhesive layer 63 is provided between the heater 32 and the oxide film 65. The adhesive layer 63 is in close contact with the oxide film 65 from the side where the heater 32 is located on the back surface 46 of the plate 31. However, the oxide film 65 is not formed on the treatment surface 41, the contact surface 55A of the engagement claw 53A, and the contact surface 55A of the engagement claw 53B.

Here, the oxide film 65 is formed by electrolyzing the plate 31 as an anode. That is, the oxide film 65 is formed by anodizing the plate 31 formed of metal. For example, in the embodiment in which the metal forming the plate 31 contains aluminum, the oxide film 65 of aluminum oxide is formed by performing alumite treatment which is anodizing treatment of aluminum. In the present embodiment, since the oxide film 65 is formed by the anodizing treatment, in the plate 31, the oxide film 65 erodes inward from the surface before the anodizing process. Further, since the portion where metal is oxidized by the anodizing treatment expands, the dimension of the plate 31 is increased at the portion where the oxide film 65 is formed, as compared to before the anodizing treatment is performed. However, in the anodizing treatment, the oxide film 65 erodes from the surface of the plate 31 to the inner side, so the size increase of the plate 31 due to the anodizing treatment is smaller than the film thickness of the oxide film 65.

In one embodiment, the oxide film 65 is formed by alumite treatment, and the thermal conductivity of the oxide film 65 is, for example, about 40 W / (m · K) to 50 W / (m · K). In this case, the thermal conductivity of the oxide film 65 is higher than that of the adhesive layer 63. Further, in one embodiment, the oxide film 65 is formed to have a thickness of, for example, 5 μm or more and 50 μm or less. The anodizing treatment is performed in a state in which a portion where the oxide film 65 is not formed is masked on the surface of the plate 31 such as the treatment surface 41 and the adhesion surfaces 55A and 55B.

In the present embodiment, by forming the adhesive layer 63 and the oxide film 65 as described above, the electrical insulation between the plate 31 and the heater 32 is secured. For example, based on IEC standard 60601-1: 2005, between the plate 31 and the heater 32 (heater wire 62), an alternating voltage of 50 Hz or 60 Hz for 1 minute at 1.5 kV using a withstand voltage tester. When applied, it is necessary to ensure electrical insulation to such an extent that dielectric breakdown does not occur. In the present embodiment, due to the adhesive layer 63 and the oxide film 65, the frequency is required between 50 Hz and 60 Hz between the plate 31 and the heater 32 according to the IEC standard 60601-1: 2005. Withstanding voltage of 5 kV or more is ensured. If the oxide film 65 of aluminum oxide is formed to have a thickness of 5 μm or more and 50 μm or less and the entire recess 47 if the other conditions are the same, the oxide film 65 is not formed. As compared with the case, the withstand voltage between the plate 31 and the heater 32 is improved, for example, by about 1 kV.

Further, by the alumite treatment used in the present embodiment, the oxide film 65 of aluminum oxide has heat resistance such that no crack occurs even if the temperature rises to about 400 ° C. That is, in the oxide film 65, no crack occurs at any temperature of 15 ° C. (temperature around room temperature) or more and 400 ° C. or less. Since no crack occurs in the oxide film 65, the adhesive layer 63 and the oxide film 65 ensure electrical insulation between the plate 31 and the heater 32 at any temperature of 15 ° C. or more and 400 ° C. or less. And, at any temperature of 15 ° C. or more and 400 ° C. or less, the adhesion layer 63 and the oxide film 65 between the plate 31 and the heater 32 have a frequency of 1.5 kV or more with respect to an AC voltage of 50 Hz or 60 Hz. The voltage resistance of the In one embodiment, for example, the alumite treatment is performed using a specific electrolytic solution to form the above-described heat-resistant oxide film 65 of aluminum oxide.

FIG. 5 is a view showing the configuration of the boundary between the oxide film 65 and the adhesive layer 63 and the vicinity thereof. As shown in FIG. 5, an oxide film 65 is formed by anodizing treatment such as alumite treatment, whereby a porous layer 66 having a large number of holes (bore) 68 is formed in the oxide film 65. The porous layer 66 forms the surface of the oxide film 65 on the back surface 46 of the plate 31. The porous layer 66 is formed from the surface of the oxide film 65 to the inside of the plate 31 over a predetermined dimension. Then, in the range where the porous layer 66 is formed, each of the holes 68 is continuously extended from the surface of the oxide film 65 to the inner side. In the oxide film 65, a layer 67 having no or few cavities such as the holes 68 is adjacent to the inner side of the porous layer 66. Then, the layer 67 continues to the boundary between the metal forming the plate 31 and the oxide film 65.

Further, the adhesive layer 63 adheres to the porous layer 66 from the side where the heater 32 is located. Then, each of the holes 68 of the porous layer 66 is filled with a resin that forms the adhesive layer 63, and the adhesive layer 63 adheres to the porous layer 66 in each of the holes 68. Therefore, the adhesion of the plate 31 to the back surface 46 by the adhesive layer 63 is improved.

Next, the operation and effects of the heat treatment device 2 of the present embodiment will be described. When treating a treatment subject using the heat treatment tool 2, the operator inserts the end effector 8 into a body cavity such as the abdominal cavity and places the treatment subject between the

jaws

15 and 16. Then, by closing the handle 12 with respect to the grip 11, the

jaws

15, 16 are closed relative to each other, and the treatment object is gripped between the

jaws

15, 16. Then, in a state where the treatment target is held between the

jaws

15 and 16, the operator inputs an operation using the operation device 10. Thereby, electric energy is output from the power supply device 3 to the thermal treatment tool 2 and, as described above, at least one of the heat generated by the heater 32 and the high frequency current is applied as treatment energy to the treatment object to be held. .

In the present embodiment, as described above, the adhesive layer 63 and the oxide film 65 ensure electrical insulation between the plate 31 and the heater 32, and at the same time, 1. between the plate 31 and the heater 32. The withstand voltage of 5 kV or more is secured. Therefore, even when electric energy is supplied to the heater 32 and at the same time other electric energy is supplied to the plate 31 and the electrode member 22, conduction between the plate 31 and the heater 32 is appropriately prevented. .

Further, in the present embodiment, the oxide film 65 is formed in the recess 47 of the back surface 46 of the plate 31 at the portion to which the heater 32 is attached. For this reason, even if the adhesive layer 63 is formed thin, conduction through the adhesive layer 63 and the oxide film 65 between the heater 32 and the plate 31 is effectively prevented. In addition, the adhesive layer 63 has lower thermal conductivity than the oxide film 65 formed by alumite treatment or the like. By thinning the adhesive layer 63 having low thermal conductivity, the heat transfer from the heater 32 to the plate 31 through the adhesive layer 63 and the oxide film 65 is improved, and the heat generated by the heater 32 is transferred to the treatment surface 41. Transferability is improved. Further, in the present embodiment, the oxide film 65 is formed in the concave portion 47 of the back surface 46 of the plate 31 at a portion other than the portion where the heater 32 is attached. Therefore, even when discharge from the heater 32 is generated in the cavity 48 by the supplied electric energy, the oxide film 65 effectively prevents conduction between the heater 32 and the plate 31 due to the discharge.

Further, in the present embodiment, in the oxide film 65, no crack occurs at any temperature of 15 ° C. (temperature around room temperature) and 400 ° C. or less. Therefore, in the treatment of controlling the temperature of the heater 32 to about 110 ° C. and solidifying (sealing) the treatment target by the heat of the heater 32, no crack occurs in the oxide film 65. Therefore, in the treatment of solidifying (sealing) the treatment object by the heat of the heater 32, the adhesive layer 63 and the oxide film 65 ensure electrical insulation between the plate 31 and the heater 32 and the plate 31 The withstand voltage of 1.5 kV or more is secured between the and the heater 32. Similarly, in the present embodiment, the temperature of the heater 32 is controlled to about 320 ° C. to 330 ° C., and in the treatment in which the heat of the heater 32 cuts the treatment target, no crack occurs in the oxide film 65. Therefore, in the treatment of cutting the treatment target by the heat of heater 32, electrical insulation between plate 31 and heater 32 is secured by adhesive layer 63 and oxide film 65, and plate 31 and heater 32 Between them, a withstand voltage of 1.5 kV or more is ensured.

As described above, in the heat treatment device 2 of the present embodiment, the heat generated by the heater 32 is appropriately applied from the treatment surface 41 of the plate 31 to the treatment target, and the electrical energy between the plate 31 and the heater 32 is obtained. Insulation and withstand voltage are properly secured.

Further, in the present embodiment, each of the holes 68 of the porous layer 66 is filled with a resin for forming the adhesive layer 63, and the adhesion of the adhesive layer 63 to the back surface 46 of the plate 31 is improved as described above. . Therefore, the heater 32 is firmly attached to the back surface 46, and the adhesion of the heater 32 to the back surface 46 is improved. Further, by improving the adhesion of the heater 32, the heat transfer from the heater 32 to the plate 31 through the adhesive layer 63 and the oxide film 65 is improved, and the heat generated by the heater 32 is transferred to the treatment surface 41. Improves the quality.

Further, in the present embodiment, the oxide film 65 is formed by anodizing treatment such as alumite treatment as described above. For this reason, the oxide film 65 which ensures the electrical insulation between the plate 31 and the heater 32 is formed, without separately providing the coating agent etc. which have electrical insulation. That is, labor and cost are reduced in the formation of the oxide film 65 in which the electrical insulation between the plate 31 and the heater 32 is secured.

In the present embodiment, an example is described in which the plate 31 is formed of a metal containing aluminum and the oxide film 65 is formed of aluminum oxide. For this reason, both the plate 31 and the oxide film 65 contain aluminum. However, heat resistance that oxide film 65 does not generate a crack at any temperature of, for example, 15 ° C. (temperature around room temperature) to 400 ° C., and the above-mentioned voltage resistance test based on IEC standard 60601-1: 2005. A material not containing aluminum may be used as the material of the plate 31 and the oxide film 65 as long as the material has the electrical insulation satisfying the condition of

(Modification)
In the above-described embodiment and the like, the oxide film 65 is formed over the whole or substantially the entire recess 47, but in a modification, the oxide film 65 is formed only on a part of the recess 47. In this case, in one example, the oxide film 65 is formed only on the bottom surface 51 of the recess 47, and in another example, the oxide film 65 is formed only on the side surfaces 52A and 52B of the recess 47. However, in any case, the oxide film 65 is not formed on the treatment surface 41 and the contact surfaces 55A and 55B of the

engagement claws

53A and 53B. And in any case, the electrical insulation between the heater 32 and the plate 31 is secured by the adhesive layer 63 and the oxide film 65, and the voltage resistance of 1.5 kV or more between the heater 32 and the plate 31 is ensured. Is secured.

Further, in a modification, the back surface 46 is not provided with the recess 47. Also in this case, the heater 32 is attached to the back surface 46 via the adhesive layer 63, and the oxide film 65 is formed on at least a part of the back surface 46. In one example, the oxide film 65 is formed on the back surface 46 both at the portion where the heater 32 is attached and at the portion other than the portion where the heater 32 is attached. In another example, the oxide film 65 is formed only on the back surface 46 where the heater 32 is attached. In yet another example, the oxide film 65 is formed only on the back surface 46 other than where the heater 32 is attached. However, in any case, the oxide film 65 is not formed on the treatment surface 41 and the contact portion with the holder 33 (for example, the contact surfaces 55A and 55B). And in any case, the electrical insulation between the heater 32 and the plate 31 is secured by the adhesive layer 63 and the oxide film 65, and the voltage resistance of 1.5 kV or more between the heater 32 and the plate 31 is ensured. Is secured.

Moreover, in the above-mentioned embodiment etc., although the end effector 8 is provided with a pair of

jaws

15 and 16, in a certain modification, the return electrode plate installed in test subjects, such as a human body, is provided instead of the jaw 15. Also in this case, the electric energy is supplied to the heater 32 based on the operation of the operation device 10, and the heater 32 generates heat. By supplying electric energy to the heater 32 in a state where the treatment surface 41 of the plate 31 contacts the treatment object, the heat generated by the heater 32 is applied to the treatment object through the plate 31 and the treatment surface 41. Further, in the present modification, electric energy is supplied to the plate 31 and the return electrode plate based on the operation of the operation device 10. Then, electrical energy is supplied to the plate 31 and the return electrode plate in a state where the treatment surface 41 of the plate 31 contacts the treatment object, whereby a high frequency current flows through the treatment object, and a high frequency current is applied to the treatment object. That is, in addition to the treatment tool for performing the bipolar treatment of flowing the high frequency current between the pair of jaws, the above-described configuration is applicable to the treatment tool for performing the monopolar treatment of flowing the high frequency current between the return electrode plate and the end effector It is.

The present invention is not limited to the above embodiment, and can be variously modified in the implementation stage without departing from the scope of the invention. In addition, the embodiments may be implemented in combination as appropriate as possible, in which case the combined effect is obtained. Furthermore, the above embodiments include inventions of various stages, and various inventions can be extracted by an appropriate combination of a plurality of disclosed configuration requirements.

Claims

A heater that generates heat by supplying electric energy;
A plate comprising a treatment surface to be brought into contact with an object to be treated and a back surface opposite to the treatment surface, the plate being made of conductive metal, the heater being attached to the back surface, the heater A plate for transmitting the generated heat toward the treatment surface;
An oxide film provided on at least a part of the back surface of the plate and formed of an oxidized oxide of the metal forming the plate, and having an electrical insulating property;
Thermal treatment tool equipped with.
The metal forming the plate comprises aluminum,
The oxide film is formed of aluminum oxide,
The heat treatment tool according to claim 1.
The heat treatment tool according to claim 1, wherein the oxide film comprises a porous layer forming a surface of the oxide film on the back surface of the plate.
An adhesive layer is further provided, which is provided between the oxide film and the heater and is made of an electrically insulating resin and is in close contact with the porous layer of the oxide film from the side where the heater is located. The heat treatment tool of claim 3.
The heat treatment tool according to claim 1, wherein the oxide film ensures electrical insulation between the plate and the heater at any temperature of 15 ° C. or more and 400 ° C. or less.
An adhesive layer is provided between the heater and the back surface of the plate and is formed of an electrically insulating resin and is in close contact with the back surface of the plate from the side where the heater is located. The heat treatment tool of claim 1.
The heat treatment tool according to claim 6, wherein the oxide film and the adhesive layer ensure a withstand voltage of 1.5 kV or more between the plate and the heater at any temperature of 15 ° C. or more and 400 ° C. or less. .
The heat treatment tool according to claim 1, wherein the oxide film is formed on the back surface of the plate at least at a portion to which the heater is attached.
The heat treatment tool according to claim 1, wherein the oxide film is formed on the back surface of the plate at least at a site other than the site where the heater is attached.
The heat treatment device according to claim 1, wherein the plate is capable of applying a high frequency current to the treatment target through the treatment surface by being supplied with electric energy different from the electric energy to the heater.
A coating layer formed on the treatment surface of the plate and having conductivity, the coating layer further comprising a coating layer formed of a material containing a resin and preventing sticking to the treatment surface of the treatment target 11. The heat treatment tool of claim 10.
The heat treatment tool according to claim 11, wherein the coating layer is formed of a mixture of metal powder mixed with fluorine-based resin.
And a gripping piece facing the treatment surface and openable and closable relative to the plate,
The gripping piece includes an abutting surface capable of abutting on the treatment surface of the plate by closing the gripping piece against the plate, and an electrode member formed of a conductive material,
The plate and the electrode member can supply a high frequency current through the object to be treated between the treatment surface and the electrode member by supplying electric energy different from the electric energy to the heater. become,
The heat treatment tool according to claim 1.
The heat treatment tool according to claim 1, wherein the oxide film has a thickness of 5 μm or more and 50 μm or less.