WO2018011919A1

WO2018011919A1 - Grasping and treating device, and method for forming jaw and cover

Info

Publication number: WO2018011919A1
Application number: PCT/JP2016/070719
Authority: WO
Inventors: 一浩森崎
Original assignee: オリンパス株式会社
Priority date: 2016-07-13
Filing date: 2016-07-13
Publication date: 2018-01-18
Also published as: JP6759339B2; JPWO2018011919A1

Abstract

Provided is a grasping and treating device comprising: a treating section; a jaw (21) provided with an outer surface and capable of being opened and closed relative to the treating section, the outer surface being provided with an end surface which forms a treating section-side end section, a back surface which faces the side opposite the end surface, and side surfaces which face the width direction; a cover (22) which is at least extended to a portion of the back surface of the outer surface of the jaw (21) or to portions of the side surfaces of the outer surface and which is in close contact, at the portion or the portions extended to the outer surface, with the jaw (21); a jaw-side engagement section provided to the jaw (21); and a cover-side engagement section provided to the cover (22) and restricting the movement of the cover (22) relative to the jaw (21) by engaging with the jaw-side engagement section while being in close contact therewith.

Description

Grasping treatment tool and jaw and cover molding method

The present invention relates to a grasping treatment instrument that treats a treatment object grasped between a treatment portion and a grasping piece, and a method for forming a jaw and a cover provided in the grasping treatment instrument.

US Patent Application Publication No. 2005/0021017 discloses an energy treatment device for grasping a treatment object between a treatment portion and a grasping piece. In this energy treatment device, a jaw is provided on the gripping piece, and a heat source is provided on the jaw. And the cover which has heat insulation is provided in the back surface of jaw.

In a treatment tool such as US Patent Application Publication No. 2005/0021017, an external force may be applied to the cover when a treatment of a living tissue or the like is performed. For this reason, the cover needs to be firmly fixed to the jaw. As a method of fixing the cover to the jaw, there are a method of fixing using a separate part such as a pin or a screw, and a method of fixing by providing an engaging part such as a hooking claw or a boss on the jaw or the cover. In the method of fixing using separate parts, the number of parts increases and the assembly process becomes complicated, thereby increasing the cost of molding. Further, in the method of attaching the cover provided with the engagement portion to the jaw, it is difficult to firmly fix the cover to the jaw.

The present invention has been made to solve the above-mentioned problems, and the object of the present invention is to provide a grasping treatment instrument that can firmly fix the cover to the jaw and can form the jaw and the cover at a low cost. Is to provide. Another object of the present invention is to provide a method for forming a jaw and a cover provided in the grasping treatment instrument.

In order to achieve the above object, a grasping treatment instrument according to an aspect of the present invention includes a treatment portion and an outer surface, and can be opened and closed with respect to the treatment portion, and the outer surface forms an end portion on the treatment portion side. An end surface, a rear surface facing away from the end surface, and a side surface facing in the width direction, and at least a part of the rear surface or a part of the side surface of the outer surface of the jaw. The portion extending to the outer surface is in close contact with the jaw, the cover, the jaw side engaging portion provided in the jaw, the cover provided in close contact with the jaw side engaging portion A cover-side engaging portion that restricts the movement of the cover relative to the jaw by engaging.

The jaw and cover molding method provided in the grasping treatment instrument of an aspect of the present invention is a jaw that can be opened and closed with respect to the treatment portion in the grasping treatment instrument, and a cover molding method that is formed on the outer surface of the jaw. And forming the jaw, on the outer surface of the jaw, an end surface forming an end on the treatment portion side, a back surface facing the side opposite to the end surface, and a side surface facing the width direction, Forming a jaw side engaging portion on the jaw, attaching the jaw to a mold, and filling a cavity formed by the mold with a material forming the cover And at least a portion of the outer surface of the jaw that extends to a part of the back surface or a part of the side surface and extends to the outer surface by the filled material. Forming the cover in a state of being in close contact with the cover, and forming the cover side engaging portion in the state of being in close contact with and engaging with the jaw side engaging portion by the filled material. And restricting the movement of the cover with respect to the jaw by the engagement of the jaw side engaging portion and the cover side engaging portion.

FIG. 1 is a schematic diagram illustrating a treatment system in which the treatment tool according to the first embodiment is used. FIG. 2 is a schematic view of the end effector according to the first embodiment viewed from one side in the width direction. FIG. 3 is a schematic view of the second gripping piece according to the first embodiment as viewed from the side where the second gripping piece is closed with respect to the first gripping piece. FIG. 4 is a perspective view schematically showing the jaw according to the first embodiment. FIG. 5 is a perspective view schematically showing the jaw and the cover according to the first embodiment. FIG. 6 is a cross-sectional view schematically showing a cross section substantially perpendicular to the extending direction of the jaw at the position AA in FIG. FIG. 7 is a cross-sectional view schematically showing a jaw and a cover according to an example of the first embodiment in a cross section substantially perpendicular to the extending direction of the jaw. FIG. 8 is a cross-sectional view schematically showing a cross section substantially perpendicular to the extending direction of the jaws at the position AA of FIG. 5 according to a modification of the first embodiment. FIG. 9 is a cross-sectional view schematically showing a state in which a cover is formed on the jaw arranged in the mold in the first embodiment, in a cross section substantially perpendicular to the width direction of the jaw. 10 is a cross-sectional view schematically showing a cross section taken along the line DD of FIG. 11 is a cross-sectional view schematically showing a cross section taken along line EE of FIG. 12 is a cross-sectional view schematically showing a cross section taken along line FF of FIG. 9 when the depth of the groove formed by the stepped portion is the smallest. 13 is a cross-sectional view schematically showing a cross section taken along line FF in FIG. 9 when the depth of the groove formed by the step portion is larger than a predetermined length. FIG. 14 is a cross-sectional view schematically showing a state where a cover is formed on a jaw arranged in a mold in an example of the first embodiment, in a cross section substantially perpendicular to the longitudinal direction of the jaw.

A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing a treatment system in which the grasping treatment instrument 1 of the present embodiment is used. As shown in FIG. 1, the grasping treatment instrument 1 has a longitudinal axis C. Here, in the grasping treatment instrument 1, the direction along the longitudinal axis C is defined as the longitudinal direction. One side in the longitudinal direction is defined as the distal end side (arrow C1 side), and the opposite side to the distal end side is defined as the proximal end side (arrow C2 side).

The grasping treatment instrument 1 includes a housing 4 that can be held, a shaft 5 that is coupled to the distal end side of the housing 4, and an end effector 6 that is provided at the distal end of the shaft 5. One end of a cable 7 is connected to the housing 4. The other end of the cable 7 is detachably connected to the power supply unit 3. The housing 4 is provided with a grip (fixed handle) 11 and a handle (movable handle) 12 that is rotatably attached. When the handle 12 is rotated with respect to the housing 4, the handle 12 is opened or closed with respect to the grip 11.

In the present embodiment, the handle 12 is positioned on the distal end side with respect to the grip 11, and moves substantially parallel to the longitudinal axis C in the opening or closing operation with respect to the grip 11, but this is not restrictive. Absent. For example, in some embodiments, the handle 12 may be located proximal to the grip 11. In another embodiment, the handle 12 is located on the side opposite to the grip 11 with respect to the longitudinal axis C, and the moving direction in the opening or closing operation with respect to the grip 11 intersects with the longitudinal axis C. (It may be substantially vertical).

FIG. 2 is a view showing the shaft 5 and the end effector 6. As shown in FIG. 2, the shaft 5 extends along the longitudinal axis C. The end effector 6 includes a first gripping piece 13 (treatment section) and a second gripping piece 14 that opens and closes between the first gripping piece 13. The first grip piece 13 includes a first facing surface 16 that faces the second grip piece 14. The second gripping piece 14 includes a second facing surface 17 that faces the first gripping piece 13 (first facing surface 16). The handle 12 and the second gripping piece 14 are connected via a movable member 18 extending along the longitudinal axis C inside the shaft 5. The movable member 18 moves along the longitudinal axis C with respect to the shaft 5 and the housing 4 by opening or closing the handle 12 that is an opening / closing operation input unit with respect to the grip 11, and between the pair of

gripping pieces

13 and 14. Opens or closes. A living tissue such as a blood vessel is formed between the first gripping piece 13 (first facing surface 16) and the second gripping piece 14 (second facing surface 17) by closing between the

gripping pieces

13, 14. Is grasped as a treatment target. The movable member 18 may extend along the longitudinal axis C outside the shaft 5. In this case, the movable member 18 is a hollow cylinder extending along the longitudinal axis C, and the shaft 5 is extended along the longitudinal axis C inside the movable member 18.

The opening / closing direction of the end effector 6 intersects the longitudinal axis C (substantially perpendicular). Of the opening and closing directions of the end effector 6, the side on which the second gripping piece 14 opens with respect to the first gripping piece 13 is defined as the opening direction of the second gripping piece 14 (arrow Y1 side in FIG. 1). The side where the gripping piece 14 is closed with respect to the first gripping piece 13 is defined as the closing direction of the second gripping piece 14 (arrow Y2 side in FIG. 1). The direction intersecting the longitudinal axis C and intersecting the opening / closing direction of the end effector 6 is defined as the width direction of the end effector 6 (the first gripping piece 13 and the second gripping piece 14).

The first grip piece 13 and the second grip piece 14 are provided at the tip of the shaft 5 and can be opened and closed between the first grip piece 13 and the second grip piece 14. Good. For example, in one embodiment, the first gripping piece 13 is formed integrally with the shaft 5. And the 2nd holding piece 14 is attached to the front-end | tip part of the shaft 5 so that rotation is possible. In another embodiment, both the first grip piece 13 and the second grip piece 14 are pivotally attached to the tip of the shaft 5. In still another embodiment, a rod member (not shown) is inserted into the shaft 5, and the first gripping piece 13 is formed by a protruding portion of the rod member (probe) from the shaft 5 toward the distal end side. And the 2nd holding piece 14 is attached to the front-end | tip part of the shaft 5 so that rotation is possible.

FIG. 3 is a view of the second gripping piece 14 as viewed from the first gripping piece 13 side (the closing direction side of the second gripping piece 14). As shown in FIGS. 2 and 3, the second gripping piece 14 includes a jaw 21 and a cover 22 provided outside the jaw 21. The jaw 21 is made of a metal such as stainless steel, for example. The cover 22 forms a part of an exposed surface exposed to the outside in the second gripping piece 14. The cover 22 is made of, for example, a resin such as super engineering plastic, ceramic, rubber, or the like. The cover 22 is formed in close contact with an outer surface 29 (see FIG. 4 described later) of the jaw 21 by injection molding. A molding method of the cover 22 by injection molding will be described later.

A holder member 50 is attached to the first holding piece 13 side of the jaw 21 (the closing direction side of the second holding piece 14). The holder member (electrode member) 50 is provided along the extending direction of the second gripping piece 14 and is made of a metal such as stainless steel. The holder member 50 forms a part of the second facing surface 17.

Each of the first grip piece 13 and the second grip piece 14 is at least partially formed of a conductive material. In the present embodiment, the first gripping piece 13 is made of a conductive material. In the second gripping piece 14, the jaw 21 and the holder member 50 are formed of a conductive material. The first gripping piece 13 is electrically connected to the power supply unit 3 through an electrical path extending through the inside of the shaft 5, the inside of the housing 4, and the inside of the cable 7. Further, the holder member 50 of the second gripping piece 14 is electrically connected to the power supply unit 3 via the inside of the shaft 5, the inside of the housing 4 and the inside of the cable 7, and the jaw 21. Connected. In a state where the treatment target is grasped between the first grasping piece 13 and the second grasping piece 14, electric energy (high frequency electric energy) is supplied from the power supply unit 3 to each of the first grasping piece 13 and the holder member 50. Is supplied, a high-frequency current flows between the first grasping piece 13 and the holder member 50 through the grasped treatment target. At this time, each of the first gripping piece 13 and the holder member 50 acts as an electrode. When the high frequency current flows through the treatment target to be grasped, the sealing treatment of the treatment target is performed.

A contact member 51 is attached to the holder member 50 on the first holding piece 13 side (the closing direction side of the second holding piece 14). The contact member 51 is provided along the extending direction of the second gripping piece 14. A part of the second facing surface 17 is formed by the contact member 51. The contact member 51 is made of a non-conductive material. When the space between the first gripping piece 13 and the second gripping piece 14 is closed in a state where the treatment target is not gripped between the first gripping piece 13 and the second gripping piece 14, the contact member 51 is One grip piece 13 (first opposing surface 16) is brought into contact. Thereby, when the space between the first gripping piece 13 and the second gripping piece 14 is closed in a state where the treatment target is not gripped between the first gripping piece 13 and the second gripping piece 14, A short circuit due to contact between electrodes provided on each of the gripping piece 13 and the second gripping piece 14 is prevented.

FIG. 4 is a diagram showing the jaw 21. In FIG. 4, only the jaw 21 is shown, and the cover 22 is not shown. As shown in FIG. 4, the jaw 21 includes a connecting portion 23 that is connected to each of the movable member 18 and the shaft 5, and a jaw body 24 that is provided on the distal end side of the connecting portion 23. A pressing surface 25 is provided at the distal end of the connecting portion 23. The pressing surface 25 forms a part of the outer surface of the connecting portion 23. In the present embodiment, the pressing surface 25 extends from a portion facing the one side in the width direction of the second gripping piece 14 to a portion facing the other side in the width direction of the second gripping piece 14 on the outer surface of the connecting portion 23. It is continuous. And the pressing surface 25 is extended through the site | part which faces the opening direction of the 2nd holding | grip piece 14 in the outer surface of the connection part 23. As shown in FIG. Here, a direction substantially perpendicular to the extending direction of the pressing surface 25 is defined as a surface width direction of the pressing surface 25, and a dimension of the pressing surface 25 in the surface width direction is defined as a surface width B of the pressing surface 25. In the range where the pressing surface 25 is extended, the surface width B of the pressing surface 25 is ensured to some extent in the majority. For this reason, the area of the entire pressing surface 25 is also secured to a certain size.

The jaw body 24 includes an outer surface 29 that faces the outside of the jaw body 24. The outer surface 29 includes a back surface 26 facing the opening direction of the second gripping piece 14, a side surface 27 facing the width direction of the second gripping piece 14, and an end surface 28 facing the closing direction of the second gripping piece 14. Has been. The side surface 27 is provided continuously with the back surface 26 on the closing direction side of the second gripping piece 14 with respect to the back surface 26. The end face 28 is provided continuously to the side face 27 on the side of the second gripping piece 14 in the closing direction with respect to the side face 27. The end surface 28 is a surface that faces away from the back surface 26 in the opening / closing direction of the second gripping piece 14, and forms an end portion on the first gripping piece 13 side on the outer surface 29. That is, the end surface 28 is an outer edge portion of the jaw main body 24. In the present embodiment, the cover 22 is provided continuously from the back surface 26 through the side surface 27 to the end surface 28.

FIG. 5 is a diagram showing the second gripping piece 14. As shown in FIG. 5, the jaw body 24 includes an inner surface 30 that faces the inside of the jaw body 24. In the present embodiment, the inner surface 30 is formed in a concave shape that is recessed toward the opening direction side of the second gripping piece 14. An inner bottom surface 31 facing the closing direction side of the second gripping piece 14 and an inner side surface 32 facing the width direction of the second gripping piece 14 are formed on the inner surface 30. In the inner surface 30, a planar portion 33 that is a plane is formed on each of the inner bottom surface 31 and the inner side surface 32. The flat portion 33 may be formed continuously or intermittently. On the inner surface 30, the entire area of the flat portion 33 is formed to be relatively large.

FIG. 6 is a view showing a cross section substantially perpendicular to the extending direction of the jaw 21 at the position AA in FIG. As shown in FIGS. 4 to 6, the jaw body 24 has a hole 34 extending from the outer surface 29 toward the inside of the jaw body 24. The hole 34 is defined by a hole defining surface 36 and penetrates the jaw body 24 from the back surface 26 to the inner bottom surface 31 in the opening / closing direction of the second gripping piece 14. For this reason, the hole 34 is opened in each of the back surface 26 and the inner bottom surface 31. In the present embodiment, two holes 34 are formed. In the hole 34, the protrusion 35 provided on the cover 22 is in close contact with the hole defining surface 36, and the protrusion 35 is engaged with the hole 34. That is, the protrusion 35 that is the cover side engaging portion is in close contact with and engaged with the jaw side engaging portion formed by the hole 34 and the hole defining surface 36. The protrusion 35 protrudes from the cover 22 toward the jaw 21 (the closing direction side of the second gripping piece 14). Since the hole 34 and the protrusion 35 are engaged, the movement of the cover 22 relative to the jaw 21 is restricted.

The hole 34 includes a small hole portion 41 (first portion) and a large hole portion 42 (second portion). The small hole portion 41 extends from the back surface 26 of the jaw main body 24 toward the inner bottom surface 31. The large hole portion 42 extends continuously from the small hole portion 41 toward the closing direction side of the second gripping piece 14 with respect to the small hole portion 41. The large hole portion 42 extends from the small hole portion 41 to the inner bottom surface 31. The diameter (cross-sectional area) of the hole 34 in the large hole portion 42 is larger than the diameter (cross-sectional area) of the hole 34 in the small hole portion 41.

The projection 35 includes a small diameter portion 44 and a large diameter portion 45. The large diameter portion 45 forms a protruding end of the protrusion 35. The small diameter portion 44 is in close contact with the hole defining surface 36 in the small hole portion 41 and is engaged with the small hole portion 41. The diameter (cross-sectional area) of the protrusion 35 at the small diameter portion 44 is substantially the same as the diameter (cross-sectional area) of the hole 34 at the small hole portion 41. The large diameter portion 45 is in close contact with the hole defining surface 36 at the large hole portion 42 and is engaged with the large hole portion 42. The diameter (cross-sectional area) of the protrusion 35 at the large-diameter portion 45 is substantially the same as the diameter (cross-sectional area) of the hole 34 at the large-hole portion 42. That is, the diameter (cross-sectional area) of the protrusion 35 at the large-diameter portion 45 is larger than the diameter (cross-sectional area) of the protrusion 35 at the small-diameter portion 44. Since the large diameter portion 45 is engaged with the large hole portion 42 in the engaging portion between the hole 34 and the protrusion 35, the movement of the cover 22 with respect to the jaw 21 is further restricted. In the present embodiment, the cross section of the hole 34 is formed in a substantially circular shape, but is not limited thereto. For example, the cross section of the hole 34 may be formed in a polygonal shape. In this case, the cross-sectional area of the protrusion 35 at the large-diameter portion 45 is formed larger than the cross-sectional area of the protrusion 35 at the small-diameter portion 44. The cross section of the protrusion 35 is formed in a polygonal shape along the hole 34 and the hole defining surface 36.

A stepped portion 43 is provided on the inner bottom surface 31. The stepped portion 43 is a groove having a substantially circular cross section that is recessed from the inner bottom surface 31 toward the back surface 26 side (the outside of the jaw body 24). The step portion 43 includes a bottom surface portion 46. The bottom surface portion 46 is a bottom surface of a groove formed on the inner bottom surface 31 by the step portion 43. Here, the hole 34 penetrates the jaw body 24 from the back surface 26 to the inner bottom surface 31. The hole 34 opens at the bottom surface portion 46 in the inner bottom surface 31. In a cross section substantially perpendicular to the extending direction of the hole 34 (the opening / closing direction of the second gripping piece 14), the diameter (cross sectional area) of the groove formed by the stepped portion 43 is larger than the diameter (cross sectional area) of the hole 34. . The step portion 43 may be a groove having a polygonal cross section. In this case, the cross-sectional area of the groove formed by the step portion 43 is formed larger than the cross-sectional area of the hole 34.

The cover 22 is continuously formed from the back surface 26 through the side surface 27 to the end surface 28. A hook 49 is formed on the cover 22 along the end face 28. The hook 49 (cover 22) is in close contact with the end face 28 from the first gripping piece 13 side (the closing direction side of the second gripping piece 14). That is, the hook portion 49 that is the cover side engaging portion is in close contact with and engaged with the end surface 28 that is the jaw side engaging portion. The movement of the cover 22 relative to the jaw 21 is restricted by the engagement between the end face 28 and the hooking portion 49.

Further, the end face 28 includes a slope 47. The inclined surface 47 is inclined toward the back surface 26 side (the opening direction side of the second gripping piece 14) as it goes toward the inner side (side approaching the center) of the jaw body 24 in the width direction of the second gripping piece 14. Yes. The inclined surface 47 is provided on the inner end of the end surface 28 in the width direction. A claw portion 48 is formed along the inclined surface 47 in the hook portion 49. The claw portion 48 (cover 22) is in close contact with the inclined surface 47 from the inside in the first gripping piece 13 side (the closing direction side of the second gripping piece 14) and the width direction of the second gripping piece 14. In other words, the claw portion 48 that is the cover side engaging portion is brought into close contact with the inclined surface 47 that is the jaw side engaging portion. Since the inclined surface 47 and the claw portion 48 are engaged with each other at the engaging portion between the end surface 28 and the hooking portion 49, the movement of the cover 22 with respect to the jaw 21 is further restricted. The inclined surface 47 may be formed on a part of the end surface 28 in the longitudinal direction, or may be provided on the entire end surface 28 in the longitudinal direction.

In an embodiment, as shown in FIG. 7, a hole 52 extending from the outer surface 29 toward the inside of the jaw body 24 may be formed on the side surface 27. In this case, the hole 52 is defined by the hole defining surface 54 and penetrates the jaw body 24 in the width direction from the side surface 27 to the inner side surface 32. In the present embodiment, a plurality of holes 52 are formed on the side surface 27 and the inner side surface 32. In the hole 52, the protrusion 53 provided on the cover 22 is in close contact with the hole defining surface 54, and the protrusion 53 is engaged with the hole 52. That is, the protrusion 53 that is the cover side engaging portion is in close contact with and engaged with the jaw side engaging portion formed by the hole 52 and the hole defining surface 54. The protrusion 53 protrudes from the cover 22 toward the inside of the second gripping piece 14 in the width direction. Since the hole 52 and the protrusion 53 are engaged, the movement of the cover 22 relative to the jaw 21 is restricted.

Next, the operation and effect of the grasping treatment instrument 1 of the present embodiment will be described. When performing a treatment using the grasping treatment instrument 1, the operator holds the housing 4 of the grasping treatment instrument 1 and inserts the end effector 6 into a body cavity such as the abdominal cavity. Then, a treatment target such as a blood vessel is disposed between the

gripping pieces

13 and 14, and the handle 12 is closed with respect to the grip 11 to close the space between the

gripping pieces

13 and 14. Thereby, the blood vessel is gripped between the

gripping pieces

13 and 14. And treatment energy, such as a high frequency current, is given to treatment object, and sealing treatment of the treatment object grasped is performed.

The jaw 21 is provided with a cover 22. Accordingly, even when the cover 22 comes into contact with a living tissue other than the treatment target when performing the treatment of the treatment target, the heat generated in the treatment is transmitted via the cover 22 to the living tissue with which the cover 22 comes into contact. Is suppressed. Moreover, in the site | part in which the exposed surface of the 2nd holding piece 14 is formed with the cover 22, the unevenness | corrugation formed in an exposed surface decreases. For this reason, when performing the treatment of the treatment target, the biological tissue is restrained from being caught by the unevenness of the exposed surface, and the biological tissue is prevented from clogging (depositing) in the exposed surface, and sticking of the biological tissue is prevented. The

In the grasping treatment instrument 1 of the present embodiment, the protrusion 35 which is the cover side engaging portion is in close contact with and engaged with the jaw side engaging portion formed by the hole 34 and the hole defining surface 36. Since the projection 35 is in close contact with and engaged with the hole defining surface 36, the cover 22 moves relative to the jaw 21 in a direction substantially perpendicular to the extending direction of the hole 34 (opening / closing direction of the second gripping piece 14). Is regulated. That is, the movement of the cover 22 relative to the jaw 21 is restricted in the width direction and the longitudinal direction of the second gripping piece 14. That is, the movement of the cover 22 with respect to the jaw 21 is restricted by the engagement of the jaw side engaging portion (hole 34 and hole defining surface 36) and the cover side engaging portion (projection 35). By restricting the movement of the cover 22 relative to the jaw 21, the cover 22 is fixed to the jaw 21. The cover 22 is formed in close contact with the jaw 21 by injection molding described later. For this reason, the cover 22 is firmly fixed to the jaw 21.

By firmly fixing the cover 22 to the jaw 21, it is possible to effectively prevent the cover 22 from being detached from the jaw 21 by an external force acting on the end effector 6. By effectively preventing the cover 22 from being removed from the jaw 21, the effectiveness, device resistance and safety of the grasping treatment instrument 1 are ensured.

Further, in the present embodiment, in the retaining structure of the hole 34 and the protrusion 35, the small diameter portion 44 is brought into close contact with the hole defining surface 36 by the small hole portion 41, and the large diameter portion 45 is engaged with the large hole portion 42. In close contact with the hole defining surface 36. For this reason, the large diameter portion 45 is in close contact with the hole defining surface 36 in the jaw body 24 from the closing direction side of the second gripping piece 14 in the hole 34. Further, the cover 22 is in close contact with the back surface 26 from the opening direction side of the second gripping piece 14. Therefore, the cover 22 is in close contact with the jaw body 24 from both sides in the opening / closing direction of the second gripping piece 14. Since the cover 22 is in close contact with the jaw body 24 from both sides in the opening / closing direction of the second gripping piece 14, the movement of the cover 22 relative to the jaw 21 is restricted in the opening / closing direction of the second gripping piece 14. For this reason, in the retaining structure of the hole 34 and the protrusion 35, the movement of the cover 22 relative to the jaw 21 in the opening / closing direction of the second gripping piece 14 in addition to the width direction and the longitudinal direction of the second gripping piece 14 is prevented. It is further regulated. Thereby, the cover 22 is more firmly fixed to the jaw 21. The large diameter portion 45 is formed in close contact with the hole defining surface 36 at the large hole portion 42 by injection molding described later. For this reason, the cover 22 is firmly fixed to the jaw 21 even in the retaining structure of the large hole portion 42 and the large diameter portion 45.

The hole 34 may be configured not to extend to the inner bottom surface 31. In this case, the hole 34 does not penetrate the jaw body 24 in the opening / closing direction of the second gripping piece 14 and does not open in the inner bottom surface 31.

Further, in the present embodiment, the hole 34 has two portions (small hole portion 41 and large hole portion 42) in which the diameter (cross-sectional area) of the hole 34 is different from each other, but the number is not limited to two. For example, in addition to the small hole portion 41 and the large hole portion 42, the hole 34 has a portion where the diameter (cross-sectional area) of the hole 34 is larger than the diameter (cross-sectional area) of the hole 34 in the large hole portion 42. The hole 42 may be further formed on the closing direction side of the second gripping piece 14. In this case, the hole 34 further includes a first portion (large hole portion 42) and a second portion (a portion where the diameter of the hole 34 is larger than the diameter of the hole 34 in the large hole portion 42). Thereby, the movement of the cover 22 with respect to the jaw 21 is further regulated.

Further, the hole 34 and the hole defining surface 36 may be formed in a substantially conical shape or a polygonal pyramid shape whose diameter (cross-sectional area) increases from the back surface 26 toward the inner bottom surface 31. In this case, the protrusion 35 has a substantially conical shape or a polygonal pyramid shape whose diameter (cross-sectional area) increases from the cover 22 toward the jaw 21 side. Even in this case, the hole 34 and the hole defining surface 36 have a first portion and a diameter (cross-sectional area) of the hole 34 of the first portion within the substantially conical shape or the polygonal pyramid shape. A second portion larger than the diameter (cross-sectional area) is formed. The protrusion 35 is in close contact with the hole defining surface 36 from the inside of the hole 34, and is in close contact with the hole defining surface 36 from the closing direction side of the second gripping piece 14. That is, by forming the first portion and the second portion in the hole 34, the movement of the cover 22 relative to the jaw 21 is further restricted.

In this embodiment, the hole 34 is formed on the back surface 26 of the jaw 21, but is not limited thereto. For example, the hole 34 may be formed in the side surface 27 of the jaw 21. In this case, the hole 34 penetrates the jaw 21 from the side surface 27 to the inner side surface 32 in the width direction. Then, the protrusion 35 provided on the cover 22 is brought into close contact with the hole defining surface 36 through the hole 34 and the large hole portion 42 of the hole 34 and the large diameter portion 45 of the protrusion 35 are engaged. Thereby, the cover 22 is fixed to the jaw 21. Further, the hole 34 may extend from the end face 28 of the jaw 21 toward the back face 26 side. In this embodiment, the hole 21 is provided in the jaw 21 and the projection 35 is provided in the cover 22, but this is not restrictive. For example, a protrusion having a large diameter portion and a small diameter portion may be provided on the back surface 26 (outer surface 29) of the jaw 21, and a hole may be provided in the cover 22. In this case, the cover 22 is brought into close contact with the protrusion in the hole and engaged.

The cover 22 is formed continuously from the back surface 26 to the side surface 27 and the end surface 28. Therefore, the cover 22 is in close contact with the jaw body 24 from the outside in the width direction of the second gripping piece 14 on each of the side surfaces 27. For this reason, the movement of the cover 22 relative to the jaw 21 is restricted in the width direction of the second gripping piece 14.

The cover 22 is in close contact with the jaw 21 from the opening direction side of the second gripping piece 14 on the back surface 26. Further, a hooking portion 49 that is a cover side engaging portion is in close contact with the jaw 21 from the closing direction side of the second gripping piece 14 to an end surface 28 that is a jaw side engaging portion. Therefore, the cover 22 is in close contact with the outer surface 29 of the jaw body 24 from both sides in the opening / closing direction of the second gripping piece 14. For this reason, the movement of the cover 22 relative to the jaw 21 is restricted in the opening / closing direction of the second gripping piece 14. That is, the movement of the cover 22 relative to the jaw 21 is restricted by the engagement of the jaw side engaging portion (end surface 28) and the cover side engaging portion (hooking portion 49). By restricting the movement of the cover 22 relative to the jaw 21, the cover 22 is fixed to the jaw 21. The hooking portion 49 is formed in close contact with the end surface 28 by injection molding described later. For this reason, the cover 22 is firmly fixed to the jaw 21 even in the retaining structure of the end face 28 and the hooking portion 49.

Further, a slope 47 is formed on the end face 28 of the jaw 21. A claw portion 48 that is a cover side engagement portion is in close contact with the inclined surface 47 that is a jaw side engagement portion from the inside in the closing direction side and the width direction of the second gripping piece 14. For this reason, the movement of the cover 22 relative to the jaw 21 is restricted in the retaining structure of the end face 28 and the hooking portion 49. That is, the movement of the cover 22 relative to the jaw 21 is restricted by the engagement of the jaw side engaging portion (slope surface 47) and the cover side engaging portion (claw portion 48). By restricting the movement of the cover 22 relative to the jaw 21, the cover 22 is fixed to the jaw 21. The claw portion 48 is formed in close contact with the inclined surface 47 by injection molding described later. For this reason, the cover 22 is firmly fixed to the jaw 21 even in the retaining structure of the inclined surface 47 and the claw portion 48.

In the present embodiment, the end face 28 is formed with the slope 47, but the present invention is not limited to this. For example, as a modification, as shown in FIG. 8, a concave surface 55 facing the closing direction of the second gripping piece 14 on the back surface 26 side of the end surface 28 is provided on the end surface 28 instead of the inclined surface 47. May be. In this case, a stepped portion 56 is formed between the end surface 28 and the recessed surface 55. The claw portion 48 provided in the hook portion 49 is formed along the recessed surface 55 and the stepped portion 56. The claw portion 48 is in close contact with the concave surface 55 from the first gripping piece 13 side, and is in close contact with the stepped portion 56 from the inside in the width direction of the second gripping piece 14. That is, it is only necessary that the inner end of the end surface 28 in the width direction be provided with a recess toward the back surface 26. Moreover, in another certain Example, the nail | claw part 48 does not need to be provided.

Further, in the embodiment in which the hole 52 is provided, the protrusion 53 as the cover side engaging portion is in close contact with the jaw side engaging portion formed by the hole 52 and the hole defining surface 54. Since the hole defining surface 54 and the protrusion 53 are in close contact with each other, the cover 22 with respect to the jaw 21 is approximately perpendicular to the extending direction of the hole 52 (the width direction of the second gripping piece 14). Movement is restricted. That is, the movement of the cover 22 relative to the jaw 21 is restricted in the opening / closing direction and the longitudinal direction of the second gripping piece 14. That is, the movement of the cover 22 relative to the jaw 21 is restricted by the engagement of the jaw side engaging portion (hole 52 and hole defining surface 54) and the cover side engaging portion (protrusion 53). By restricting the movement of the cover 22 relative to the jaw 21, the cover 22 is fixed to the jaw 21. The protrusion 53 is formed in close contact with the hole 52 by injection molding described later. For this reason, the cover 22 is firmly fixed to the jaw 21 even in the retaining structure of the hole 52 and the protrusion 53.

The hole 52 may be configured not to extend to the inner side surface 32. In this case, the hole 52 does not penetrate the jaw body 24 in the width direction.

In this embodiment, the hole 52 is formed on the side surface 27 of the jaw 21, but the present invention is not limited to this. For example, the hole 52 may be formed in the back surface 26 of the jaw 21. In this case, the hole 52 penetrates the jaw 21 from the back surface 26 to the inner bottom surface 31 in the opening / closing direction of the second gripping piece 14. Then, the protrusion 53 provided on the cover 22 is brought into close contact with the hole defining surface 54 in the hole 52 and engaged therewith. Thereby, the cover 22 is fixed to the jaw 21. Further, the hole 52 may be configured to extend from the end surface 28 of the jaw 21 toward the back surface 26 side.

In this embodiment, the hole 21 is provided in the jaw 21 and the protrusion 53 is provided in the cover 22, but this is not restrictive. For example, a protrusion may be provided on the side surface 27 (outer surface 29) of the jaw 21 and a hole may be provided in the cover 22. In this case, the cover 22 is brought into close contact with the protrusion in the hole and engaged.

In this embodiment, the cross section of the hole 52 is formed in a substantially circular shape, but is not limited thereto. For example, the cross section of the hole 52 may be formed in a polygonal shape. In this case, the cross section of the protrusion 53 is formed in a polygonal shape along the hole 52 and the hole defining surface 54.

As described above, the grasping treatment instrument 1 of the present embodiment is provided with a plurality of retaining structures formed by engaging the jaw side engaging portion and the cover side engaging portion. Thereby, the movement of the cover 22 with respect to the jaw 21 is restricted in multiple directions. This effectively prevents the cover 22 from coming off the jaw 21 against multidirectional external forces acting on the end effector 6. One retaining structure may be formed in the second gripping piece 14, or a plurality of retaining structures may be appropriately combined. The cover 22 extends along the longitudinal direction on the back surface 26, the side surface 27, and the end surface 28 of the jaw body 24. The cover 22 extends at least to a part of the back surface 26 or a part of the side surface 27 of the outer surface 29, and is in close contact with the jaw 21 at a portion extending to the outer surface 29.

In the above-described embodiment and the like, the treatment target treatment is performed when a high-frequency current flows through the treatment target such as a blood vessel, but this is not restrictive. In one embodiment, ultrasonic vibration is used as treatment energy. In this case, an ultrasonic transducer (not shown) is provided inside the housing 4, and a probe (not shown) extending toward the distal end side through the inside of the shaft 5 is connected to the ultrasonic transducer. . And the 1st holding piece 13 is formed of the protrusion part from the shaft 5 of a probe. Electrical energy is supplied from the power supply unit 3 to the ultrasonic transducer, and ultrasonic vibration is generated in the ultrasonic transducer. The generated ultrasonic vibration is transmitted to the first gripping piece 13 through the probe and applied to the treatment target to be gripped.

In another embodiment, heat generated by a heating element (not shown) provided in the end effector 6 is used as treatment energy. In this case, electrical energy is supplied from the power supply unit 3 to the heating element, and heat generated by the heating element is applied to the treatment target.

Also, a plurality of treatment energies among high-frequency current, ultrasonic vibration, heat generated by the heating element, and the like may be simultaneously applied to the treatment target to be grasped.

The configuration of the present embodiment is also applicable to a treatment instrument in which treatment energy is not applied to a treatment target to be grasped. In such a treatment instrument, for example, when an electric motor (not shown) is driven, staples are punctured into a treatment target grasped between the grasping

pieces

13 and 14.

(Molding method)
Next, a method for forming the jaw 21 and the cover 22 in the grasping treatment instrument 1 of the present embodiment will be described. The cover 22 of this embodiment is formed of a material such as a resin such as super engineering plastic or rubber. The cover 22 is formed in close contact with the jaw 21 by injection molding. FIG. 9 is a view showing a state in which the cover 22 is formed on the jaw 21 in this molding method. FIG. 9 is a view showing a cross section that is substantially perpendicular to the width direction of the second gripping piece 14 and passes through the center of the second gripping piece 14 in the width direction.

Here, the extending direction of the jaw 21 is the longitudinal direction of the jaw 21. One side in the longitudinal direction of the jaw 21 is defined as a distal end side (arrow X1 side in FIG. 9), and the other side in the longitudinal direction is defined as a proximal end side (arrow X2 side in FIG. 9). The longitudinal direction of the jaw 21 is substantially parallel to the longitudinal axis C when the second gripping piece 14 is closed with respect to the first gripping piece 13. Further, in the jaw 21, the direction substantially perpendicular to the back surface 26 is the up-down direction, one side in the up-down direction is the upper side (arrow Y1 side in FIG. 9), and the opposite side is the lower side (arrow Y2 side in FIG. 9). And The vertical direction substantially coincides with the opening / closing direction of the second gripping piece 14. Further, in the jaw 21, a direction (substantially perpendicular) intersecting the longitudinal direction and the vertical direction of the jaw 21 is defined as a width direction of the jaw 21. The width direction of the jaw 21 substantially coincides with the width direction of the second gripping piece 14.

When the cover 22 is formed, first, the jaw 21 is formed. The jaw 21 is formed by forging, cutting, MIM (metal powder injection molding), die casting, or the like. At this time, the above-described outer surface 29 (including the back surface 26, the side surface 27, and the end surface 28) and the jaw side engaging portion are formed on the jaw 21. Then, the jaw 21 is fixed to the installation surface 75 of the first mold K1. The first mold K1 is a metal mold member. The shape of the installation surface 75 of the first mold K <b> 1 is formed substantially the same as the shape of the inner surface 30 of the jaw 21.

Then, the second mold K2 is moved, and the second mold K2 is brought into contact with the first mold K1. The second mold K2 includes a concave surface 76 that is recessed to the side opposite to the side on which the first mold K1 is located. By bringing the second mold K 2 into contact with the first mold K 1, the concave surface 76 faces the installation surface 75 of the first mold K 1, and a cavity 77 is provided between the installation surface 75 and the concave surface 76. Is formed. The second mold K2 is a metal mold member. The shape of the concave surface 76 of the second mold K2 is formed substantially the same as the shape of the outer surface of the cover 22 to be formed. Then, molten resin is injected and injected into a cavity 77 formed between the first mold K1 and the second mold K2. Thereby, the inside of the cavity 77 is filled with the molten resin. Then, the resin filled in the cavity 77 is cooled and solidified, whereby the cover 22 is formed in close contact with the jaw 21 (integrally). At this time, the cover 22 is formed with the cover side engaging portion. Note that rubber or the like may be injected instead of resin.

In the present embodiment, a planar portion 33 (see FIG. 5) is formed on each of the inner bottom surface 31 and the inner side surface 32. When the jaw 21 is fixed to the first mold K1, the installation surface 75 of the first mold K1 and the inner surface 30 (the inner bottom surface 31 and the inner side surface 32) of the jaw 21 abut. At this time, the installation surface 75 of the first mold K1 and the flat portion 33 are engaged. When the installation surface 75 of the first mold K1 is engaged with the flat surface portion 33, the movement of the jaw 21 with respect to the first mold K1 is restricted. By restricting the movement of the jaw 21 with respect to the first mold K <b> 1, the deviation of the jaw 21 from the predetermined position in the cavity 77 is suppressed. By suppressing the deviation of the jaw 21 from the predetermined position in the cavity 77, the positional accuracy of the jaw 21 in the cavity 77 is improved.

When the cover 22 is formed by injection molding, the position of the jaw 21 in the cavity 77 may be displaced from a predetermined position. If injection molding of the cover 22 is performed in this state, molding defects such as burrs and shorts may occur.

Here, the burr is a portion excessively formed at a position different from a desired position on the surface of the molded product due to an extra gap being formed in the cavity. Further, the short circuit is an insufficient filling caused by the material not reaching a desired position in the cavity due to a gap that is not sufficient for the molten material to flow in the cavity. Thereby, the formed article to be formed may be formed in a partially chipped state. Burrs and shorts can be reduced by improving the positional accuracy of the parts fixed in the cavity.

In this molding method, the positional accuracy of the jaw 21 in the cavity 77 is improved by restricting the movement of the jaw 21 relative to the first mold K1. Improving the positional accuracy of the jaw 21 in the cavity 77 reduces molding defects that occur when the cover 22 is molded. By reducing molding defects that occur when the cover 22 is molded, the cover 22 can be formed with desired accuracy. For this reason, the retaining structure for firmly fixing the cover 22 to the jaw 21 without attaching the cover to the jaw using another part and without attaching the cover provided with the engagement portion to the jaw can be easily achieved. Can be formed.

Further, the inner bottom surface 31 and the inner side surface 32 of the jaw 21 are each provided with a flat portion 33 in a wide range, and the entire area of the flat portion 33 is relatively large. Since the flat surface portion 33 is provided in a relatively wide range, the installation surface 75 of the first mold K1 and the flat surface portion 33 in a state where the jaw 21 is fixed to the installation surface 75 of the first mold K1. The contact area at a portion where the two engage with each other is relatively large (wide). Since the contact area at the portion where the installation surface 75 of the first mold K1 and the flat surface portion 33 are engaged is relatively large (wide), the positional accuracy of the jaw 21 in the cavity 77 is improved. More improved. Since the positional accuracy of the jaw 21 in the cavity 77 is further improved, molding defects that occur during the molding of the cover 22 are further reduced.

FIG. 10 is a cross-sectional view taken along the line DD of FIG. FIG. 10 shows a cross section substantially perpendicular to the longitudinal direction at a portion where the pressing surface 25 is located (a base end portion in the jaw 21). As shown in FIGS. 9 and 10, in a state where the jaw 21 is disposed in the cavity 77, the concave surface 76 of the second mold K <b> 2 is located on the jaw 21 from the upper side and the outer side in the width direction on the pressing surface 25. It is in contact. When the second mold K2 contacts the jaw 21 from the upper side and the outer side in the width direction, the jaw 21 is pressed to the lower side and the inner side in the width direction on the pressing surface 25, that is, toward the first mold K1. The When the jaw 21 is pressed toward the first mold K1 on the pressing surface 25, the movement of the jaw 21 relative to the first mold K1 is restricted in the vertical direction and the width direction. By restricting the movement of the jaw 21 relative to the first mold K1 in the vertical direction and the width direction, the positional accuracy of the jaw 21 within the cavity 77 is improved. Improving the positional accuracy of the jaw 21 in the cavity 77 reduces molding defects that occur when the cover 22 is molded.

In this embodiment, the surface width B of the pressing surface 25 is ensured to a certain extent. For this reason, the area of the portion where the jaw 21 is pressed from the second mold K2 on the pressing surface 25 is ensured to a certain extent. Since the area of the portion where the jaw 21 is pressed from the second mold K2 is ensured to be relatively large, the positional accuracy of the jaw 21 within the cavity 77 is further improved. By further improving the positional accuracy of the jaw 21 in the cavity 77, molding defects that occur when the cover 22 is molded can be further reduced.

FIG. 11 is a cross-sectional view taken along the line EE of FIG. FIG. 11 shows a cross section substantially perpendicular to the longitudinal direction at the tip of the jaw 21. As shown in FIGS. 9 and 11, the concave surface 76 of the second mold K <b> 2 includes a protrusion 71. The protrusion 71 protrudes downward from the second mold K2. The protrusion 71 is disposed at the tip of the concave surface 76 in the second mold K2. In a state where the jaw 21 is disposed in the cavity 77, the lower end of the projecting portion 71 is in contact with the back surface 26 of the jaw 21 from above. Then, in a state where the protruding portion 71 is in contact with the back surface 26 of the jaw 21 from above, the inside of the cavity 77 is filled with resin, rubber, or the like, and the cover 22 is formed. At this time, the cover 22 is not formed on the back surface 26 at the portion where the protruding portion 71 abuts. For this reason, a hole 72 is formed in the formed cover 22 so as to penetrate the cover 22 in the vertical direction (the opening / closing direction of the second gripping piece 14) in the portion where the protrusion 71 is located when the cover 22 is molded. The

At this time, the protrusion 71 abuts on the jaw 21 from above, so that the jaw 21 is pressed downward (toward the first mold K1) by the protrusion 71. When the jaw 21 is pressed toward the first mold K1 by the protrusion 71, the movement of the jaw 21 relative to the first mold K1 in the vertical direction is restricted. When the cover 22 is molded, the positional accuracy of the jaw 21 in the cavity 77 is improved by restricting the movement of the jaw 21 relative to the first mold K1 in the vertical direction. Improving the positional accuracy of the jaw 21 in the cavity 77 reduces molding defects that occur when the cover 22 is molded.

In the present embodiment, the jaw 21 is changed to the first mold K1 by the second mold K2 at both the base end portion (pressing surface 25) and the tip end portion (contact position with the protruding portion 71) of the jaw 21. It is pressed toward. For this reason, the positional accuracy of the jaw 21 in the cavity 77 is further improved. Since the positional accuracy of the jaw 21 in the cavity 77 is further improved, molding defects that occur during the molding of the cover 22 are further reduced.

FIG. 12 is a cross-sectional view taken along line FF in FIG. FIG. 12 shows a cross section that is substantially perpendicular to the longitudinal direction and passes through the hole 34. As shown in FIG. 12, in a state where the jaw 21 is fixed to the first mold K1, the inner surface 30 of the jaw 21 is in contact with the installation surface 75 of the first mold K1.

In the present embodiment, as described above, the protrusion 35 is in close contact with and engaged with the jaw 21 in the hole 34. Further, the protrusion 35 is in close contact with and engaged with the jaw 21 from the lower side (the closing direction side of the second gripping piece 14) in the large diameter portion 45. For this reason, the cover 22 is firmly fixed to the jaw 21.

In this molding method, when the cover 22 is formed, the cavity 77 is filled with resin while the jaws 21 are fixed to the first mold K1, so that the projection 35 is formed in the hole 34. It is formed. For this reason, the protrusion 35 can be formed in a state of being in close contact with the hole 34 and the hole defining surface 36. For this reason, the shape which fixes the cover 22 to the jaw 21 firmly can be formed easily.

The installation surface 75 includes a protruding portion 79 that protrudes upward. The protrusion 79 is a protrusion having a substantially circular cross section substantially perpendicular to the protrusion direction. In a state where the installation surface 75 and the inner bottom surface 31 are in contact with each other and the jaw 21 is fixed to the first mold K 1, the protruding portion 79 enters the groove formed by the step portion 43. The cross section of the protruding portion 79 may be polygonal.

In the jaw 21, the depth of the groove formed by the stepped portion 43 may be different from the predetermined length due to manufacturing errors or the like. In other words, the length between the inner bottom surface 31 and the bottom surface portion 46 in the vertical direction may be formed larger or smaller than a predetermined length. FIG. 12 shows a case where the length between the inner bottom surface 31 and the bottom surface portion 46 is the smallest. As shown in FIG. 12, in the state where the installation surface 75 and the inner surface 30 are in contact with each other and the jaw 21 is fixed to the first mold K1, the projecting portion 79 and the bottom surface portion 46 are in contact. And the protrusion 35 is formed by filling the space between the holes 34 with resin. At this time, since the projecting portion 79 and the bottom surface portion 46 are in contact with each other, filling of the resin beyond the range of the groove formed by the stepped portion 43 is suppressed. For this reason, it is prevented that a burr | flash is formed exceeding the range of the groove | channel which the level | step-difference part 43 forms.

FIG. 13 is a view showing a cross section taken along line FF of FIG. 9 when the length between the inner bottom surface 31 and the bottom surface portion 46 is formed to be larger than a predetermined size. In a state where the installation surface 75 and the inner surface 30 are in contact with each other and the jaw 21 is fixed to the first mold K1, the length from the inner bottom surface 31 to the bottom surface portion 46 in the vertical direction is from the protrusion 79 to the installation surface. Greater than 75 lengths. For this reason, the protrusion part 79 and the bottom face part 46 do not contact | abut. When the space between the holes 34 is filled with the resin, the inside of the groove formed by the stepped portion 43 is also filled with the resin passing between the protruding portion 79 and the bottom surface portion 46. And in the groove | channel which the level | step-difference part 43 forms, a burr | flash is formed with the resin with which it filled.

In the present embodiment, even when burrs are formed due to manufacturing errors of the jaws 21, the step portion 43 is provided on the inner bottom surface 31, so that the range in which the burrs are formed is the groove formed by the step portion 43. Within the range of. This prevents burrs from being formed at unintended positions. This prevents the formation of burrs on the inner surface 30 beyond the range of the groove formed by the stepped portion 43. Since it is prevented that burrs are formed on the inner surface 30 of the jaw 21 at portions other than the groove due to the stepped portion 43, the holder member 50 (see FIG. 2) attached to the jaw 21 at the second gripping piece 14 is burr. Is prevented from coming into contact. That is, in the present embodiment, the step portion 43 is provided on the inner bottom surface 31, thereby preventing the member attached to the inner surface 30 of the jaw 21 such as the holder member 50 from interfering with the burr.

In the present embodiment, as described above, the hook portion 49 is in close contact with and engaged with the end surface 28 from the lower side. Further, the claw portion 48 is in close contact with and engaged with the inclined surface 47 from the inside in the lower side and the width direction. For this reason, the cover 22 is firmly fixed to the jaw 21.

When the cover 22 is formed, the cavity 77 is filled with resin while the jaw 21 is fixed to the first mold K1, so that the gap between the end face 28 and the first mold K1 is reached. Thus, the hooking portion 49 is formed. For this reason, the hook part 49 can be formed in a state of being in close contact with and engaging with the end face 28. For this reason, the shape which fixes the cover 22 to the jaw 21 firmly can also be formed easily.

FIG. 14 shows a cross section passing through the center of the hole 52 substantially perpendicular to the longitudinal direction in the embodiment in which the hole 52 is formed in the jaw 21. As shown in FIG. 14, in a state where the jaw 21 is fixed to the first mold K1, the inner surface 30 of the jaw 21 contacts the installation surface 75 of the first mold K1 from the second mold K2 side. Touching. Also in the retaining structure of the protrusion 53 and the hole 52, as described above, the protrusion 53 is in close contact with and engaged with the jaw 21 in the hole 52. Thereby, the cover 22 is fixed to the jaw 21. When the cover 22 is formed, the projections 53 are formed in the holes 52 by filling the cavity 77 with resin while the jaws 21 are fixed to the first mold K1. For this reason, the protrusion 53 can be formed in close contact with the hole 52 and the hole defining surface 54. For this reason, the shape which fixes the cover 22 to the jaw 21 firmly can be formed easily.

As described above, in the present molding method, the cover 22 is formed in close contact with the jaw 21 by injection molding, so that the cover is not attached to the jaw using another component, and the cover provided with the engagement portion. Without being attached to the jaws, a retaining structure for firmly fixing the cover 22 to the jaws 21 can be easily formed.

In the above-described embodiment and the like, the grasping treatment instrument (1) includes a treatment portion (13) and an outer surface (29), and can be opened and closed with respect to the treatment portion (13). The outer surface (29) A jaw (21) comprising an end surface (28) forming an end on the treatment portion side, a back surface (26) facing away from the end surface, and a side surface (27) facing in the width direction, and the jaw (21 ) Of the outer surface (29), at least a part of the back surface (26) or a part of the side surface (27), and a portion extending to the outer surface (29), the jaw (21 ), The jaw side engagement portion (34; 28; 47; 52) provided on the jaw (21), and the jaw side engagement provided on the cover (22). The jaws (34; 28; 47; 52) are brought into close contact with each other so that the jaws Comprises a 53), a; the cover (22) cover-side engagement portion for restricting the movement of the relative 21) (35; 49; 48.

Moreover, in the above-mentioned embodiment etc., the molding method of a cover is the jaw (21) which can be opened and closed with respect to the treatment part (13) in the grasping treatment instrument (1) and the outer surface (29) of the jaw (21). A method of forming a cover (22) to be formed, wherein the jaw (21) is formed, and an end on the treatment portion side is formed on the outer surface (29) of the jaw (21). Forming an end surface (28), a back surface (26) facing away from the end surface (28), and a side surface (27) facing in the width direction; and a jaw side engaging portion ( 34; 28; 47; 52), attaching the jaw (21) to the mold (K1, K2), and using the material for forming the cover (22), the mold (K1, K2). Filling the cavity (77) formed by The outer surface (29) of the jaw (21) extends at least on a part of the back surface (26) or a part of the side surface (27) by the filled material, and the outer surface The cover (22) is formed so as to be in close contact with the jaw (21) at a portion extending to (29), and the jaw side engaging portion (34; 28; 47) is formed by the filled material. 52) forming a cover side engaging portion (35; 49; 48; 53) in the cover (22) in a state of being in close contact with and engaging with the jaw side engaging portion (34; 28). 47; 52) and the movement of the cover (22) with respect to the jaw (21) by engagement of the cover side engaging portion (35; 49; 48; 53).

The embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the invention.

Claims

A treatment section;
Provided with an outer surface, capable of opening and closing with respect to the treatment portion, the outer surface comprising an end surface forming an end portion on the treatment portion side, a back surface facing the side opposite to the end surface, and a side surface facing the width direction; Joe,
A cover that extends at least to a part of the back surface or a part of the side surface of the outer surface of the jaw, and is in close contact with the jaw at a portion extending to the outer surface;
A jaw side engaging portion provided in the jaw;
A cover-side engagement portion that is provided on the cover and regulates the movement of the cover relative to the jaw by closely engaging with the jaw-side engagement portion;
A grasping treatment instrument comprising:
The jaw side engaging portion defines a hole extending from the outer surface of the jaw to the inner side of the jaw,
The cover-side engaging portion includes a protrusion that protrudes from the cover toward the jaw and that is closely engaged with the jaw-side engaging portion in the hole.
The grasping treatment tool according to claim 1.
The hole extends from the first portion toward the inner side of the jaw, and has a diameter larger than that of the first portion. A second part having a large
The protrusion is in close contact with the jaw side engaging portion in the first portion and the second portion of the hole,
The grasping treatment tool according to claim 2.
The jaw includes an inner surface formed therein;
The hole penetrates the jaw from the outer surface to the inner surface,
The grasping treatment tool according to claim 2.
The inner surface includes a groove recessed toward the outer side of the jaw,
The hole is open at the bottom of the groove,
The grasping treatment tool according to claim 4.
The jaw side engaging portion includes a protrusion protruding from the outer surface toward the cover,
The cover side engaging portion defines a hole, and is in close contact with the protrusion in the hole,
The grasping treatment tool according to claim 1.
The jaw side engaging portion includes the end face,
The cover side engaging portion includes a hooking portion that is brought into close contact with the end surface of the cover from the treatment portion side.
The grasping treatment tool according to claim 1.
The end surface includes a recess toward the back side,
The hook portion is in close contact with and engaged with the dent from the inside with respect to the treatment portion side and the width direction,
The grasping treatment tool according to claim 7.
A jaw that can be opened and closed with respect to a treatment part in a grasping treatment instrument, and a method of molding a cover formed on the outer surface of the jaw,
Forming the jaw, and forming, on the outer surface of the jaw, an end surface that forms an end on the treatment portion side, a back surface that faces away from the end surface, and a side surface that faces the width direction. And
Forming a jaw side engaging portion in the jaw;
Attaching the jaw to a mold;
Filling the cavity formed by the mold with the material forming the cover;
A state in which the material is filled with at least a part of the rear surface or a part of the side surface of the outer surface of the jaw and is in close contact with the jaw at a portion extending to the outer surface. Forming the cover;
Forming a cover-side engagement portion in the cover in a state of being in close contact with and engaging with the jaw-side engagement portion by the filled material, the jaw-side engagement portion and the cover-side engagement portion Restricting movement of the cover relative to the jaws by engagement of
A molding method comprising:
Attaching the jaw to the mold includes fixing each of a distal end portion and a proximal end portion of the jaw at a predetermined position in the cavity with the mold.
The molding method according to claim 9.
Forming the jaw includes forming a plane on an inner surface of the jaw;
Attaching the jaw to the mold includes fixing the jaw at a predetermined position in the cavity by bringing the plane into contact with the mold.
The molding method according to claim 9.
Forming the jaw side engaging portion includes forming a hole extending in the jaw from the outer surface to the inner side of the jaw;
Forming the cover side engaging portion includes forming a protrusion that protrudes toward the jaw in the cover and closely engages with the jaw side engaging portion in the hole.
The molding method according to claim 9.
Forming the cover side engaging portion includes forming a hooking portion on the cover that closely engages with the end surface of the jaw from the treatment portion side.
The molding method according to claim 9.