Surgical stapler

Abstract

The present invention provides a surgical stapler having a plurality of channel-forming members formed at one side portion of a base member, in which two channels among a plurality of channels formed among the plurality of channel-forming members have a symmetrical or asymmetrical cross-section and have a width narrowing along the direction of insertion, thus supporting smooth insertion of a plurality of fastening lugs into the two channels.

Description

surgical stapler

[0001] The present invention relates to a surgical stapler, and more particularly, to a surgical stapler that can improve user convenience by allowing a tool assembly and an extension shaft to be easily attached and detached.

[0002] Surgical staplers are commonly used in abdominal and thoracic surgeries for organ resection and anastomosis. These surgical staplers include open staplers, used in open thoracotomy or laparotomy, and endo staplers, used in thoracoscopic and laparoscopic procedures.

[0003] Surgical staplers can simultaneously cut the surgical site and perform anastomosis, thus reducing surgical time and ensuring precise stapling of the surgical site. Furthermore, surgical staplers are widely used in modern surgery due to their advantages of faster recovery and less scarring than those achieved using surgical staplers for tissue cutting and stapling.

[0004] In particular, surgical staplers are widely used in cancer surgery to cut cancer tissue and staple the cut area.

[0005] In order to use the tool assembly of a surgical stapler for disposable purposes, a structure is used in which the extension shaft and the tool assembly are detachable. Therefore, research is needed on a detachable structure of the extension shaft and the tool assembly that improves user convenience.

[0006] Prior literature includes Korean Patent Publication No. 10-1363298 (February 28, 2014).

[0007] The purpose of the present invention is to provide a surgical stapler in which a plurality of channel-forming members are formed on the other side of a base member, a plurality of channels formed between the plurality of channel-forming members are formed symmetrically or asymmetrically, and the facing sides of the plurality of channel-forming members are formed as horizontal surfaces and inclined surfaces, thereby inducing a plurality of fastening lugs to be smoothly inserted into the plurality of channels.

[0008] The technical problems to be solved by the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by a person having ordinary skill in the technical field to which the present invention belongs from the description below.

[0009] In order to achieve the above object, the present invention provides a surgical stapler including a handle assembly; an extension shaft including a base member arranged along the longitudinal direction of the handle assembly; and a tool assembly including a staple shaft including a shaft member and a plurality of fastening lugs formed on one outer surface of the shaft member along the longitudinal direction of the extension shaft, and an end effector coupled to the staple shaft.

[0010] A plurality of channel-forming members are arranged to be spaced apart from each other on the inner surface of the base member, so that a plurality of channels can be formed between the plurality of channel-forming members.

[0011] The first channel forming member, which is one of the plurality of channel forming members, may include a first horizontal channel portion extending from a distal end of the base member and parallel to the longitudinal direction of the base member, and a first inclined channel portion extending proximally from the first horizontal channel portion and having a first angle with the longitudinal direction of the base member.

[0012] At least one proximal end region of the side walls of the plurality of fastening lugs may be formed to be inclined to correspond to the first angle.

[0013] The above channel may be symmetrical with respect to a channel center axis parallel to the center axis of the shaft member, and the above fastening lug may be symmetrical with respect to a center axis of the above fastening lug parallel to the center axis of the shaft member.

[0014] The second channel forming member, which is another one of the plurality of channel forming members, may include a second horizontal channel portion extending from a distal end of the base member, parallel to the longitudinal direction of the base member, and symmetrical with the first horizontal channel portion based on the central axis of the fastening lug, and a second inclined channel portion extending proximally from the second horizontal channel portion, having a second angle with the longitudinal direction of the base member, and symmetrical with the first inclined channel portion based on the central axis of the fastening lug.

[0015] The above fastening lug may include a first side wall formed at one end of the fastening lug to correspond to the first horizontal channel portion, a first inclined wall formed to correspond to the first inclined channel portion and to be inclined from the first side wall, a second side wall formed at the other end of the fastening lug to correspond to the second horizontal channel portion, and a second inclined wall formed to correspond to the second inclined channel portion and to be inclined from the second side wall.

[0016] In another embodiment of the present invention, the channel may be asymmetrical with respect to a channel center axis parallel to the center axis of the shaft member, and the fastening lug may be asymmetrical with respect to a center axis of the fastening lug parallel to the center axis of the shaft member.

[0017] In another embodiment of the present invention, the second channel forming member, which is another one of the plurality of channel forming members, may include a third horizontal channel portion that extends from the distal end of the base member and is parallel to the longitudinal direction of the base member.

[0018] In another embodiment of the present invention, the fastening lug may include a first side wall formed at one end of the fastening lug to correspond to the first horizontal channel portion, a first inclined wall formed to correspond to the first inclined channel portion and to be inclined from the first side wall, and a third side wall formed at the other end of the fastening lug to correspond to the third horizontal channel portion.

[0019] In another embodiment of the present invention, when the shape of the channel is asymmetrical with respect to the central axis of the channel, an identification mark guiding the insertion direction of the fastening lug may be formed on the outer surface of the other side of the base member.

[0020] The present invention provides a method for forming a base member by forming a plurality of channel-forming members on the other side thereof, forming a plurality of channels symmetrically or asymmetrically between the plurality of channel-forming members, and forming a plurality of facing sides of the plurality of channel-forming members to have a horizontal surface and an inclined surface, thereby allowing a plurality of fastening lugs to be smoothly inserted into the plurality of channels, thereby facilitating the coupling between an extension shaft and a tool assembly, thereby providing convenience to a user.

[0021] The effects of the present invention are not limited to the above effects, and should be understood to include all effects that can be inferred from the detailed description of the present invention or the composition of the invention described in the claims.

[0022] FIG. 1 is a perspective view from one direction showing a surgical stapler according to a first embodiment of the present invention.

[0023] FIG. 2 is a partially exploded perspective view showing the rotary head and knob portions provided in a surgical stapler according to the first embodiment of the present invention.

[0024] FIG. 3 is a partial detailed view showing an extension shaft and an end effector provided in a surgical stapler according to the first embodiment of the present invention.

[0025] FIG. 4 is a perspective view from one direction showing the detailed configuration of an extension shaft provided in a surgical stapler according to the first embodiment of the present invention.

[0026] FIGS. 5(a), (b), (c), and (d) are plan views of a plurality of channel-forming members and channels formed on the other side of a base member provided in a surgical stapler according to the first to fourth embodiments of the present invention, as viewed from the inside of the base member.

[0027] Figures 6 (a), (b), (c), and (d) are plan views in one direction showing the fastening lug of Figure 5.

[0028] FIG. 7 is a perspective view from one direction showing an identification mark formed on the outer surface of the other side of a base member provided in a surgical stapler according to the third to fourth embodiments of the present invention.

[0029] FIG. 8 is a perspective view in one direction showing the coupling relationship between the extension shaft and the tool assembly provided in the surgical stapler according to the first embodiment of the present invention.

[0030] FIG. 9 is a perspective view from one direction showing a tool assembly provided in a surgical stapler according to the first embodiment of the present invention.

[0031] Hereinafter, the present invention will be described with reference to the attached drawings. However, the present invention can be implemented in various different forms and is therefore not limited to the embodiments described herein. In the drawings, irrelevant parts have been omitted for clarity of description, and similar parts have been designated with similar reference numerals throughout the specification.

[0032] Throughout the specification, when a part is said to be "connected (connected, contacted, or coupled)" to another part, this includes not only cases where it is "directly connected," but also cases where it is "indirectly connected" with another part in between. Furthermore, when a part is said to "include" a component, this does not exclude other components, but rather implies that it may include other components, unless otherwise specifically stated.

[0033] The terminology used herein is merely used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this specification, it should be understood that the terms "comprises" or "has" indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0034] Hereinafter, a surgical stapler according to the present invention will be described with reference to FIGS. 1 to 9.

[0035] FIG. 1 is a perspective view from one direction showing a surgical stapler according to a first embodiment of the present invention. Referring to FIG. 1, the surgical stapler according to the first embodiment of the present invention includes a handle assembly (100), an extension shaft (200), and a tool assembly (300).

[0036] The handle assembly (100) is a component that a user manipulates for cutting and anastomosis of a surgical site. The handle assembly (100) includes a support handle portion (110), an operating handle portion (120), a pulling portion (130), a rotating head portion (140), a knob portion (150), and a control rod (not shown).

[0037] The support handle (110) is a part that is held by the user and can be ergonomically formed to provide a comfortable grip for the user.

[0038] The operating handle part (120) is hinge-joined with the support handle part (110) and is positioned in front of the support handle part (110).

[0039] The pulling part (130) is slidably connected to the support handle part (110). Specifically, the pulling part (130) is positioned on the upper portion of the support handle part (110) and slides along the longitudinal direction of the handle assembly.

[0040] Figure 2 is a partially exploded perspective view showing the rotary head and knob portions provided in a surgical stapler according to the first embodiment of the present invention.

[0041] Referring to Fig. 2, the rotating head part (140) is rotatably coupled to the support handle part (110).

[0042] Additionally, the rotating head part (140) is positioned in front of the pulling part (130), i.e., in the distal direction.

[0043] The rotary head unit (140) includes a first rotary head (141) and a second rotary head (142).

[0044] The first rotary head (141) extends along the length of the extension shaft (200), and one side of the first rotary head (141) is coupled to one side of the support handle (110).

[0045] The second rotary head (142) extends along the length of the extension shaft (200) and is formed to correspond to the first rotary head (141) and is coupled with the first rotary head (141).

[0046] In addition, a rotary head hole (142a) penetrating in the upper central portion of the second rotary head (142) is formed, and the lower portion of a knob (151) described later is inserted into the rotary head hole (142a).

[0047] The knob portion (150) is a part that the user operates for pivot movement of the tool assembly (300), and the lower part of the knob portion (150) is located inside the rotary head portion (140) so that at least a portion thereof is located above the rotary head portion (140).

[0048] The knob part (150) includes a knob (151), a fastening block (152), a moving member (153), a rotating member (154), a pin member (155), an elastic member (156), a support block (157), and a guide member (158).

[0049] The knob (151) is located at the top of the rotary head (140) and can rotate.

[0050] In addition, since the knob (151) is coupled to the rotary member (154), when the knob (151) is rotated by an external force, the rotary member (154) also rotates.

[0051] The fastening block (152) is positioned inside the rotating head part (140) and can slide in the longitudinal direction of the rotating head part (140). The fastening block (152) can be placed at the bottom of the horizontal moving member (153). A stopper (152a) that protrudes upward is provided on one upper side of the fastening block (152).

[0052] As the tool assembly (300) is coupled to the extension shaft (200), the fastening block (152) moves toward the proximal direction of the handle assembly, and the stopper (152a) is separated from the coupling groove (not shown) formed in the moving member (153).

[0053] Then, the rotary member (154) rotates together with the rotation of the knob (151) as the restraint caused by the stopper (152a) is released, and the pin member (155) that rotates together with the rotation of the rotary member (154) moves along the connecting portion (153g) of the movable member, causing the movable member (153) to move horizontally, and thereby the first and second articulation links (220, 330) move horizontally or move linearly.

[0054] The movable member (153) is attached to the upper and side portions of the fastening block (152) and is coupled to the first articulation link (220).

[0055] The movable member (153) is formed with a connecting portion that is connected to the pin member (155), and the connecting portion (153g) may be formed in the shape of a long hole. When the connecting portion (153g) is formed in the shape of a long hole along the width direction of the movable member, the movable member (153) moves horizontally while the pin member (155) rotates.

[0056] The present invention is not limited thereto, and the connecting portion may have the form of a through hole or insertion groove having the same aspect ratio as that of the pin member (155). That is, the aspect ratios of the cross-sectional shape of the pin member (155) and the cross-sectional shape of the connecting portion may be formed to be the same. The lower inner diameter of the connecting portion may be formed to be larger than the upper inner diameter and may be formed in a stepped manner.

[0057] When the joint is formed in the form of a through hole or an insertion groove, the movable member (153) moves together with the pin member (155) along the rotational direction of the pin member (155). Here, when the movable member (153) moves along the rotational direction of the pin member (155) with respect to the rotational center of the rotary member (154), the trajectory along which the movable member (153) moves is expressed as the vector sum of the horizontal distance moved in the longitudinal direction of the extension shaft (200) and the vertical distance moved in the direction perpendicular to the longitudinal direction of the extension shaft. As a result, the movable member (153) moves the first articulation link (220) horizontally by the horizontal distance moved in the longitudinal direction of the extension shaft (200).

[0058] The moving member (153) includes a horizontal member (drawing number not assigned), a vertical member (drawing number not assigned), and a hanging member (drawing number not assigned).

[0059] The horizontal member is slidable and in close contact with the upper surface of the fastening block (152), and may have a flat plate shape with a predetermined thickness. A connecting groove into which a stopper (152a) is inserted is formed at the proximal end of the horizontal member.

[0060] The vertical member extends downward from the other side of the horizontal member so as to be in close contact with the side of the fastening block (152). Accordingly, the vertical member becomes perpendicular to the horizontal member.

[0061] The catch member extends from the other side of the vertical member parallel to the horizontal member.

[0062] The engaging member is inserted into a connecting hole (not shown) formed through one side of the first articulation link (220). Therefore, when the moving member moves horizontally, the first articulation link (220) also moves horizontally.

[0063] The rotary member (154) is placed in the internal space of the guide member (158) and is combined with the knob (151). That is, the guide member (154) is placed to surround the rotary member (154).

[0064] A first rotation member groove (not shown) is formed on the lower surface of the rotation member (154), and a pin member (155) is inserted into the first rotation member groove.

[0065] A pair of second rotation member grooves (not shown) are formed on the upper surface of the rotation member (154), and a pair of rotation engaging members (not shown) protruding downward from the lower portion of the knob (151) are inserted into one of the second rotation member grooves.

[0066] The pin member (155) is inserted into the first rotary member groove and the connecting portion (153g) to move the moving member (153) when the knob (151) is rotated.

[0067] More specifically, the pin member (155) is coupled to the rotary member (154) at an eccentric position with respect to the center of rotation of the rotary member (154) and rotates together with the rotary member (154) with respect to the center of rotation of the rotary member (154).

[0068] The pin member (155) may be provided in a cylindrical shape. The present invention is not limited thereto, and the pin member (155) may include a pin body in a cylindrical shape and a step member (not shown) protruding from the lower outer surface of the pin body.

[0069] The elastic member (156) is placed on the inner space of the rotating member (154).

[0070] Specifically, one end of the elastic member (156) is in close contact with one inner side of the rotating member (154), and the other end of the elastic member (156) is in close contact with the support block (157) to provide elastic force in the direction of the support block (157).

[0071] The support block (157) is located inside the rotating member (154) and supports the other end of the elastic member (156). That is, the support block (157) supports one side of the elastic member (156) and is selectively coupled to the inner surface of the guide member (158).

[0072] A plurality of engagement members (not shown) are provided on a portion of the inner surface of the guide member (158), and a plurality of tooth-shaped members (not shown) are provided on one side of the support block (157) facing the inner surface of the guide member (158) so that they can be tooth-shapedly joined to each other.

[0073] As a result, when the knob (151) rotates, the supporting block (157) also rotates together with the rotating member (154) as the rotating member (154) rotates. At this time, the supporting block (157) is elastically supported by the elastic member (156) in the internal space of the rotating member (154), and thus moves between the rotating member (154) and the guide member (158) depending on whether the tooth member of the supporting block (157) and the engagement member of the guide member (158) are engaged.

[0074] That is, the tooth member of the support block (157) passes through the rotating member (154) and is joined to the inner surface of the guide member (158).

[0075] The guide member (158) is placed on top of the moving member (153), but is placed in the internal space of the rotating head part (140).

[0076] The above guide member (158) guides the rotating member (154) to rotate in place when the knob (151) rotates.

[0077] FIG. 3 is a partial detailed view showing an extension shaft and tool assembly provided in a surgical stapler according to the first embodiment of the present invention.

[0078] Referring to FIGS. 2 and 3, the extension shaft (200) includes a connecting portion (210) and a first articulation link (220).

[0079] The connecting portion (210) is arranged along the longitudinal direction of the handle assembly (100) and includes a base member (211) and a cover member (212).

[0080] The base member (211) is arranged along the longitudinal direction of the handle assembly (140) and is located inside the cover member (212).

[0081] The first cover member (212) is formed to surround the base member (211), and the first cover member (212) serves to protect the base member (211) from impact transmitted from the outside.

[0082] The first articulation link (220) is provided on one side of the base member (211).

[0083] A connecting hole (not shown) formed on one side of the first articulation link (220) is inserted into which a catch member of the moving member (153) is inserted.

[0084] The tool assembly (300) includes a staple shaft (310) including a shaft member (311) and a plurality of fastening lugs (312) formed on one outer surface of the shaft member along the longitudinal direction of the extension shaft (200), and an end effector (320) coupled with the staple shaft.

[0085] FIG. 4 is a perspective view from one direction showing the detailed configuration of an extension shaft provided in a surgical stapler according to the first embodiment of the present invention.

[0086] Referring to Fig. 4, a plurality of lug insertion holes (211a) are formed facing each other on the other side (S) of the base member (211) and penetrate a portion of the other side of the base member (211).

[0087] FIGS. 5(a), (b), (c), and (d) are plan views of a plurality of channel-forming members and channels formed on the other side of a base member provided in a surgical stapler according to the first to fourth embodiments of the present invention, as viewed from the inside of the base member.

[0088] In addition, referring to (a), (b), (c), and (d) of FIGS. 4 and 5, a plurality of channel-forming members (213) are formed on the inner surface of the other side of the base member (211) according to the first to fourth embodiments.

[0089] In addition, as the plurality of channel forming members (213) according to the first to fourth embodiments are formed to be spaced apart from each other, a plurality of channels are formed between the plurality of channel forming members (213).

[0090] The first channel forming member (213a), which is one of the plurality of channel forming members (213) according to the first to fourth embodiments, includes a first horizontal channel portion (CS1) that extends from a distal end of the base member (211) and is parallel to the longitudinal direction of the base member (211), and a first inclined channel portion (CS2) that extends proximally from the first horizontal channel portion (CS1) and has a first angle with the longitudinal direction of the base member (211).

[0091] Specifically, referring to (a) and (c) of FIG. 5, the first channel forming member (213a) according to the first and third embodiments further includes a first terminal channel member (CS3) extending proximally from the first inclined channel member (CS2) but parallel to the longitudinal direction of the base member (211).

[0092] In addition, referring to (b) and (d) of FIG. 5, the first channel forming member (213a) according to the second and fourth embodiments further includes a first distal channel member (CS3) extending proximally from the first inclined channel member (CS2) but having a third angle with respect to the longitudinal direction of the base member (211).

[0093] Figures 6 (a), (b), (c), and (d) are plan views in one direction showing the fastening lug (312) of Figure 5.

[0094] In addition, referring to (a), (b), (c), and (d) of FIG. 6, at least one proximal end region among the side walls of the plurality of fastening lugs (312) is formed to be inclined to correspond to the first angle.

[0095] According to the first and second embodiments, as shown in (a) and (b) of FIG. 5, the channels (C1, C2) are symmetrical with respect to the channel center axis parallel to the center axis of the shaft member (311).

[0096] In addition, referring to (a) and (b) of FIG. 5, the second channel forming member (213a), which is another one of the plurality of channel forming members, includes a second horizontal channel part (CS4) that extends from the distal end of the base member (211) and is symmetrical with respect to the central axis of the fastening lug (312) while being parallel to the longitudinal direction of the base member (211), and a second inclined channel part (CS5) that extends proximally from the second horizontal channel part (CS4) and has a second angle with respect to the longitudinal direction of the base member (211) and is symmetrical with respect to the first inclined channel part (CS2) with respect to the central axis of the fastening lug (312). Here, the first angle and the second angle described above may be the same.

[0097] Specifically, referring to (a) of FIG. 5, the second channel forming member (213b) according to the first embodiment further includes a second distal channel member (CS6) extending proximally from the second inclined channel member (CS5) but parallel to the longitudinal direction of the base member (211).

[0098] Referring to (b) of FIG. 5, the second channel-forming member (213b) according to the second embodiment further includes a second distal channel member (CS6) extending proximally from the second inclined channel member (CS5) and having a fourth angle with respect to the longitudinal direction of the base member (211). Here, the third angle and the fourth angle described above may be the same.

[0099] According to the first and second embodiments, the shortest distance between the first horizontal channel portion (CS1) and the fourth horizontal channel portion (CS4) described above is longer than the shortest distance between the first terminal channel portion (CS3) and the second terminal channel portion (CS6).

[0100] Accordingly, the fastening lug (312) is symmetrical with respect to the central axis of the fastening lug (312) which is parallel to the central axis of the shaft member (311), as shown in (a) and (b) of FIG. 6.

[0101] Specifically, referring to (a) and (b) of FIG. 5 and (a) and (b) of FIG. 6, the fastening lug (312) includes a first side wall (312a) formed at one end of the fastening lug (312) to correspond to the first horizontal channel portion (CS1), a first inclined wall (312c) formed to correspond to the first inclined channel portion (CS2) and to be inclined from the first side wall (312a), a second side wall (312b) formed at the other end of the fastening lug (312) to correspond to the second horizontal channel portion (CS4), and a second inclined wall (312d) formed to correspond to the second inclined channel portion (CS4) and to be inclined from the second side wall (312b).

[0102] Meanwhile, according to the third and fourth embodiments, as shown in (c) and (d) of FIG. 5, the channels (C1, C2) are asymmetrical with respect to the channel center axis parallel to the center axis of the shaft member (311).

[0103] Specifically, referring to (c) and (d) of FIG. 5, the second channel forming member, which is another one of the plurality of channel forming members, includes a third horizontal channel portion (CS7) that is formed to extend from the distal end of the base member (211) and is parallel to the longitudinal direction of the base member (211).

[0104] Accordingly, the fastening lug (312) is asymmetrical with respect to the central axis of the fastening lug (312) which is parallel to the central axis of the shaft member (311), as shown in (c) and (d) of FIG. 6.

[0105] Specifically, referring to (c) and (d) of FIG. 5 and (c) and (d) of FIG. 6, the fastening lug (312) includes a first side wall (312a) formed at one end of the fastening lug (312) to correspond to the first horizontal channel portion (CS1), a first inclined wall (312c) formed to correspond to the first inclined channel portion (CS2) and to be inclined from the first side wall (312a), and a third side wall (312e) formed at the other end of the fastening lug (312) to correspond to the third horizontal channel portion (CS7).

[0106] FIG. 7 is a perspective view from one direction showing an identification mark formed on the outer surface of the other side of a base member provided in a surgical stapler according to the third to fourth embodiments of the present invention.

[0107] According to the third and fourth embodiments, when the shape of the channel (C1, C2) is asymmetrical with respect to the central axis of the channel (C1, C2) as illustrated in FIG. 7, an identification mark (PD) guiding the insertion direction of the fastening lug (312) is formed on the outer surface of the other side of the base member (211).

[0108] Specifically, referring to (c), (d) and (7) of FIG. 6, an identification mark (PD) corresponding to the shape of the fastening lug (312) is provided on the outer surface of the other side of the base member (211), and this identification mark (PD) can guide the user to the insertion direction of the fastening lug (312).

[0109] FIG. 8 is a perspective view in one direction showing the coupling relationship between the extension shaft and the tool assembly provided in the surgical stapler according to the first embodiment of the present invention.

[0110] Referring to FIG. 3 and FIG. 8, the first articulation link (220) is located inside the connecting portion (210) and is coupled to the knob portion (150).

[0111] Specifically, the first articulation link (220) is formed long in the longitudinal direction of the extension shaft (200) and has a predetermined thickness.

[0112] In addition, a connecting hole (not shown) that penetrates the first articulation link (220) vertically is formed on one side of the first articulation link (220), and a hook-shaped connecting hook (222) that is combined with a link hook (331) described later is formed on the other side of the first articulation link (220), as shown in FIG. 8.

[0113] The connecting hook (222) is formed in a hook shape on the other side of the first articulation link (220) and is connected to the link hook (331).

[0114] FIG. 9 is a perspective view from one direction showing a tool assembly provided in a surgical stapler according to the first embodiment of the present invention.

[0115] Referring to FIG. 9, the tool assembly (300) includes a pivot shaft (301), an eccentric connecting member (302), a staple shaft (310), an end effector (320), and a second articulation link (330).

[0116] The pivot shaft (301) is inserted into the eccentric connecting member (302) located between the staple shaft (310) and the end effector (320), the other side of the staple shaft (310) and one side of the end effector (320), and supports the end effector (320) to pivot with respect to the eccentric connecting member (302).

[0117] The eccentric connecting member (302) is located between the staple shaft (310) and the end effector (320).

[0118] The staple shaft (310) is arranged along the length of the extension shaft (200).

[0119] The fastening lugs (312) may be formed in multiple numbers, for example, as a pair, on one outer surface of the shaft member (311).

[0120] Additionally, the fastening lug (312) can be formed so that its width becomes narrower as it goes in the insertion direction, i.e., in the proximal direction, into the channel.

[0121] The second articulation link (330) is inserted into the interior of the staple shaft (310) and is coupled to the first articulation link (220) and hinge-coupled to an eccentric connecting member (302) located between the staple shaft (310) and the end effector (320).

[0122] Specifically, the second articulation link (330) connects the first articulation link (220) and an eccentric connecting member (302) spaced apart from the pivot axis (301).

[0123] Also, referring to FIG. 8, the second articulation link (330) is provided with a link hook (331) that is hooked to the connecting hook (222).

[0124] The foregoing description of the present invention is for illustrative purposes only, and those skilled in the art will readily appreciate that the present invention can be readily modified into other specific forms without altering the technical spirit or essential characteristics of the present invention. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. For example, each component described as a single entity may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined manner.

[0125] The scope of the present invention is indicated by the claims described below, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention.

[0126] <Explanation of symbols>

[0127] 100: Handle assembly 110: Support handle 120: Operating handle

[0128] 130: Pulling part 140: Rotating head part 141: First rotating head

[0129] 142: Second rotary head 150: Knob section 151: Knob

[0130] 152: Fastening block 152a: Stopper 153: Moving member

[0131] 154: Rotating member 155: Pin member 156: Elastic member

[0132] 157: Support block 158: Guide member 160: Control rod

[0133] 200: Extension shaft 210: Connection 211: Base member

[0134] 211a: Lug insertion hole 212: First cover member 213: Channel forming member

[0135] 213a: First channel forming member CS1: First horizontal channel section CS2: First inclined channel section

[0136] CS3: First end channel portion 213b: Second channel forming member CS4: Second horizontal channel portion

[0137] CS5: Second inclined channel section CS6: Second terminal channel section CS7: Third horizontal channel section

[0138] 220: First articulation link 222: Connecting hook 300: Tool assembly

[0139] 301: Pivot shaft 302: Eccentric connecting member 310: Staple shaft

[0140] 311: shaft member 312: fastening lug 312a: first side wall

[0141] 312b: Second side wall 312c: First inclined wall 312d: Second inclined wall

[0142] 312e: Third side wall 320: End effector 331: Link hook

[0143] The present invention can be widely used industrially as a surgical stapler that can improve user convenience by allowing the tool assembly and extension shaft to be easily attached and detached.

Claims

1. Handle assembly; An extension shaft including a base member arranged along the longitudinal direction of the handle assembly; and A tool assembly comprising a staple shaft including a shaft member and a plurality of fastening lugs formed on one outer surface of the shaft member along the longitudinal direction of the extension shaft, and an end effector coupled to the staple shaft; On the inner surface of the above base member, a plurality of channel-forming members are arranged to be spaced apart from each other, so that a plurality of channels are formed between the plurality of channel-forming members. A surgical stapler, characterized in that the first channel-forming member, which is one of the plurality of channel-forming members, includes a first horizontal channel portion extending from a distal end of the base member and parallel to the longitudinal direction of the base member, and a first inclined channel portion extending proximally from the first horizontal channel portion and having a first angle with the longitudinal direction of the base member.

2. In paragraph 1, A surgical stapler, characterized in that at least one proximal end region of the side walls of the plurality of fastening lugs is formed to be inclined to correspond to the first angle.

3. In paragraph 2, The above channel is symmetrical with respect to the channel center axis parallel to the center axis of the shaft member, A surgical stapler, characterized in that the fastening lug is symmetrical with respect to the central axis of the fastening lug, which is parallel to the central axis of the shaft member.

4. In paragraph 3, A surgical stapler characterized in that the second channel forming member, which is another one of the plurality of channel forming members, includes a second horizontal channel part extending from a distal end of the base member, parallel to the longitudinal direction of the base member, and symmetrical with the first horizontal channel part based on the central axis of the fastening lug, and a second inclined channel part extending proximally from the second horizontal channel part, having a second angle with the longitudinal direction of the base member, and symmetrical with the first inclined channel part based on the central axis of the fastening lug.

5. In paragraph 4, A surgical stapler, characterized in that the fastening lug includes a first side wall formed at one end of the fastening lug to correspond to the first horizontal channel portion, a first inclined wall formed to correspond to the first inclined channel portion and to be inclined from the first side wall, a second side wall formed at the other end of the fastening lug to correspond to the second horizontal channel portion, and a second inclined wall formed to correspond to the second inclined channel portion and to be inclined from the second side wall.

6. In paragraph 2, The above channel is asymmetrical with respect to the channel center axis parallel to the center axis of the shaft member, A surgical stapler, characterized in that the fastening lug is asymmetrical with respect to the central axis of the fastening lug, which is parallel to the central axis of the shaft member.

7. In paragraph 6, A surgical stapler, characterized in that the second channel-forming member, which is another one of the plurality of channel-forming members, includes a third horizontal channel portion that extends from the distal end of the base member and is parallel to the longitudinal direction of the base member.

8. In paragraph 7, A surgical stapler, characterized in that the fastening lug includes a first side wall formed at one end of the fastening lug to correspond to the first horizontal channel portion, a first inclined wall formed to correspond to the first inclined channel portion and to be inclined from the first side wall, and a third side wall formed at the other end of the fastening lug to correspond to the third horizontal channel portion.

9. In paragraph 6, A surgical stapler characterized in that, when the shape of the channel is asymmetrical with respect to the central axis of the channel, an identification mark guiding the insertion direction of the fastening lug is formed on the outer surface of the other side of the base member.

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