Anastomat

Abstract

The utility model provides an anastomat, and relates to the technical field of surgical instruments. In the anastomat, a suturing subunit is installed on a clamping subunit, and the suturing subunit comprises a nail pushing piece; the clamping subunit is provided with a first feeding groove and a limiting cavity structure, and the limiting cavity structure is located at the rear end of the first feeding groove and communicates with the first feeding groove in the set direction perpendicular to the first feeding groove; the cutting subunit comprises a cutting knife and an elastic reset structure, the cutting knife is located behind the nail pushing piece, the cutting knife and the nail pushing piece are in separable positioning connection, and a first guide block is arranged on the cutting knife; when the cutting knife is in positioning connection with the nail pushing piece, the first guide block is used for being in butt joint with the first feed groove, and the cutting knife is used for driving the nail pushing piece to move; when the cutting knife is not in positioning connection with the nail pushing piece and is located at the rear end of the first feeding groove, the elastic reset structure is used for acting on the cutting knife, so that the first guide block and the first feeding groove are staggered and contained in the limiting cavity structure. Therefore, false triggering of the cutter is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of surgical instruments, in particular to a stapler. Background Art

[0002] The stapler is a medical device commonly used for tissue anastomosis in surgical operations. It includes components such as a staple cartridge seat, a staple cartridge assembly, and a staple anvil seat. The staple cartridge assembly is usually detachably connected to the staple cartridge seat, for example, installed in a groove-shaped structure of the staple cartridge seat. The staple cartridge seat and the staple anvil seat are openably connected. During surgery, the cutting knife drives the staple pusher to slide, and the staple pusher moves to fire the staples in the staple cartridge of the staple cartridge assembly. The fired staples are deformed by the action of the staple anvil seat, for example, into a B shape, thereby completing the suturing operation (or anastomosis operation). At the same time, the cutting knife completes the cutting operation.

[0003] However, it has been observed that after the staples are fired, the cutting knife has the risk of being pushed again to cut. For example, after the staples are fired, the stapler assembly has the risk of being reloaded into the stapler seat. At this time, if the cutting knife is pushed again, it is very likely to cause a medical accident, and the safety of the stapler is insufficient. Utility Model Content

[0004] The utility model aims to solve the problem of how to avoid the cutting knife from being triggered accidentally and improve the safety of the stapler in the related art to a certain extent.

[0005] In order to solve at least one aspect of the above-mentioned problems to at least a certain extent, the utility model provides a stapler, comprising a cutting subunit, a suturing subunit and a clamping subunit; the suturing subunit is installed on the clamping subunit, and the suturing subunit includes a nail pushing member; the clamping subunit is provided with a first knife groove and a limiting cavity structure, the limiting cavity structure is located at the rear end of the first knife groove and is connected with the first knife groove in a set direction perpendicular to the first knife groove; the cutting subunit comprises a cutting knife and an elastic reset structure, the cutting knife is located behind the nail pushing member, the cutting knife is detachably positioned and connected with the nail pushing member, and a first guide block is provided on the cutting knife; when the cutting knife is positioned and connected with the nail pushing member, the first guide block is used to dock with the first knife groove, and the cutting knife is used to drive the nail pushing member to move; when the cutting knife is not positioned and connected with the nail pushing member and the cutting knife is located at the rear end of the first knife groove, the elastic reset structure is used to act on the cutting knife, so that the first guide block is misaligned with the first knife groove and accommodated in the limiting cavity structure.

[0006] Optionally, the stapler also includes a cutting transmission subunit for transmitting cutting driving force, the cutting transmission subunit includes a knife pushing rod located at the front end, the knife pushing rod is connected to the cutting knife, and the elastic reset structure acts on the cutting knife by acting on the knife pushing rod.

[0007] Optionally, the push knife rod includes a first section and a second section distributed from back to front, the front end of the second section is connected to the cutting knife, the elastic reset structure is used to act on the second section, the first section and the second section are transitionally connected via a weakening structure, and when the elastic reset structure acts on the second section, the push knife rod is used to deform at the weakened structure.

[0008] Optionally, the weakened structure is a bending structure, and an extension direction of a bending line of the bending structure, the set direction and the first tool groove are arranged crosswise in pairs.

[0009] Optionally, the push tool rod is provided with a limiting groove structure at the front end, and an open mouth is provided at the rear end of the limiting groove structure, and the open mouth is used for the passage of the elastic reset structure; the elastic reset structure is used to act on the set side wall of the limiting groove structure inside the limiting groove structure, and in the direction in which the first tool groove and the limiting cavity structure are distributed sequentially along the set direction, the part of the elastic reset structure acting on the set side wall and the set side wall are distributed sequentially.

[0010] Optionally, along the set direction, the limiting groove structure is located at one end of the knife-pushing rod close to the limiting cavity structure, and a groove width direction of the limiting groove structure is consistent with the set direction.

[0011] Optionally, the elastic reset structure includes a spring sheet structure, and the limiting groove structure is provided with a protrusion structure on the set side wall for contacting the spring sheet structure.

[0012] Optionally, the fixed end of the spring sheet structure is located behind the limiting groove structure and is fixedly arranged relative to the first tool feeding groove, and the free end of the spring sheet structure is located in front of the fixed end of the spring sheet structure;

[0013] And / or, from front to back, the distance from the point on the portion of the spring structure extending into the limiting groove structure to the limiting cavity structure gradually decreases;

[0014] And / or, a portion of the spring structure extending into the limiting groove structure is provided with a limiting hole, and the limiting hole is used to partially accommodate the protruding structure;

[0015] And / or, guide surfaces are provided at both the front and rear ends of the protruding structure.

[0016] Optionally, the rear end of the nail pushing member and the front end of the cutting knife are respectively provided with a first positioning structure and a second positioning structure, and the first positioning structure and the second positioning structure are respectively provided with a guide surface structure.

[0017] Optionally, the stapler further comprises a safety subunit and a trigger subunit; the trigger subunit comprises a trigger, the trigger is used to trigger the driving action of the cutting knife by rotation, and the safety subunit is used to lock or unlock the trigger;

[0018] And / or, a limiting block is provided on the cutting knife, and when the cutting knife is not positioned and connected with the nail pushing member and the cutting knife is located at the rear end of the first knife groove, the limiting block is used to abut against the clamping subunit in the set direction to limit the displacement of the first guide block moving along the set direction toward one side close to the limiting cavity structure;

[0019] And / or, the clamping subunit includes a nail magazine seat and a nail anvil seat, the rear end of the nail magazine seat is connected to the rear end of the nail anvil seat, and the nail magazine seat and the nail anvil seat can be opened and closed, the suturing subunit is installed on the nail magazine seat, and the nail magazine seat is provided with the first cutting groove; the nail anvil seat is provided with a second cutting groove, and the cutting knife is also provided with a second guide block, and the second guide block is used to dock with the second cutting groove.

[0020] Compared with the related prior art, in the stapler of the utility model, the cutting knife is located behind the nail pushing member along its nail pushing direction, and the cutting knife and the nail pushing member are detachably positioned and connected in the nail pushing direction. When the cutting knife and the nail pushing member are positioned and connected, along the extension direction of the first knife groove, that is, along the front-to-back direction, when force is applied to the cutting knife from back to front, the first guide block of the cutting knife can be docked with the first knife groove. Under the guiding action of the first knife groove, the cutting knife can drive the nail pushing member positioned and connected thereto to move from back to front, and the nail pushing member pushes the staples to move, that is, the staples are fired to sew the treatment object. At the same time, the cutting knife completes the cutting process on the treatment object. When the cutting knife is not positioned and connected with the nail pushing member and the cutting knife is located at the rear end of the first knife groove, under the action of the elastic reset structure, The first guide block of the cutting knife leaves the position where it can dock with the first knife groove and moves to be accommodated in the limiting cavity structure, that is, the projection of the first guide block of the cutting knife along the extension direction of the first knife groove at least partially falls outside the groove cavity of the first knife groove of the clamping subunit, even if force is applied to the cutting knife from back to front along the front-back direction, the first guide block of the cutting knife cannot dock with the first knife groove smoothly, for example, the first guide block of the cutting knife will abut against the side wall of the limiting cavity structure near the front end, thereby limiting the cutting knife from continuing to move forward, avoiding the erroneous triggering of the cutting function of the cutting knife, especially avoiding the erroneous triggering of the cutting function of the cutting knife when the staple pusher of the suturing subunit is located near the front end and separated from the cutting knife (for example, there is no stapler in the suturing subunit and it is mistakenly installed in the clamping subunit). In general, the utility model can take into account the requirements of the suturing function and the cutting function, and can also avoid the erroneous triggering of the cutting function when it is not suitable for suturing and cutting, which can improve the safety of the stapler. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the stapler when the cutting knife and the staple pusher are positioned and connected in the embodiment of the utility model;

[0022] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0023] Figure 3 for Figure 1 A schematic structural diagram of the corresponding cutting transmission subunit of the stapler;

[0024] Figure 4 This is a schematic diagram of the structure in which a limiting block is provided on the cutting knife in an embodiment of the utility model;

[0025] Figure 5 It is a structural schematic diagram of a stapler provided with a safety subunit and a trigger subunit in an embodiment of the utility model.

[0026] Description of reference numerals:

[0027] 1-cutting subunit; 11-cutting knife; 111-first guide block; 112-second positioning structure; 113-limiting block; 114-second guide block; 12-elastic reset structure; 121-fixed end; 122-free end; 123-limiting hole; 2-suturing subunit; 21-nail magazine; 22-nail magazine cover; 23-nail pusher; 231-first positioning structure; 3-clamping subunit; 31-nail magazine seat; 311-first knife groove; 312-limiting cavity structure; 313-recessed slot; 32-nail support; 321-second tool feed slot; 4-cutting transmission subunit; 41-knife push rod; 411-first section; 412-second section; 413-bending structure; 414-limiting slot structure; 4141-opening mouth; 4142-setting side wall; 4143-protruding structure; 42-transmission rod; 43-gear rod; 5-safety subunit; 51-safety knob; 52-safety; 6-trigger subunit; 61-trigger; 62-closing handle; 7-rotating transmission subunit. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the description of this specification, the description with reference to the terms "embodiment", "one embodiment", "some embodiments", "exemplarily" and "one embodiment" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or embodiment are included in at least one embodiment or embodiment of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or embodiment. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or embodiments in a suitable manner.

[0031] The terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0032] In the accompanying drawings, the Z axis represents the vertical direction, that is, the up and down position, and the positive direction of the Z axis (that is, the direction of the arrow of the Z axis) represents the up, and the negative direction of the Z axis represents the down; the X axis in the accompanying drawings represents the front and back position, and the positive direction of the X axis (that is, the direction of the arrow of the X axis) represents the front side, and the negative direction of the X axis represents the back side; the Y axis in the accompanying drawings represents the horizontal direction and is designated as the left and right position, and the positive direction of the Y axis (that is, the direction of the arrow of the Y axis) represents the right side, and the negative direction of the Y axis represents the left side; it should be noted that the aforementioned Z axis, Y axis and X axis are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0033] like Figure 1 and Figure 2 As shown ( Figure 2 The utility model provides a stapler, including a cutting subunit 1, a suturing subunit 2 and a clamping subunit 3; the suturing subunit 2 is installed on the clamping subunit 3, and the suturing subunit 2 includes a nail pushing member 23 (such as a nail pushing slide); the clamping subunit 3 is provided with a first knife groove 311 and a limiting cavity structure 312, the limiting cavity structure 312 is located at the rear end of the first knife groove 311 and is connected to the first knife groove 311 in a set direction perpendicular to the first knife groove 311; the cutting subunit 1 includes a cutting knife 11 and an elastic reset structure 12, the cutting knife 11 is located behind the nail pushing member 23, the cutting knife 11 and the nail pushing member 23 are detachably positioned and connected, and a first guide block 111 is provided on the cutting knife 11; when the cutting knife 11 and the nail pushing member 23 are positioned and connected, the first guide block 111 is used to dock with the first tool groove 311, and the cutting knife 11 is used to drive the nail pushing member 23 to move; when the cutting knife 11 is not positioned and connected with the nail pushing member 23 and the cutting knife 11 is located at the rear end of the first tool groove 311, the elastic reset structure 12 is used to act on the cutting knife 11, so that the first guide block 111 and the first tool groove 311 are misaligned and accommodated in the limiting cavity structure 312.

[0034] The stapler is mainly used in staplers with clamping, suturing and cutting functions, and this specification uses this as an example for explanation. Specifically, the stapler includes: an execution unit for realizing clamping, cutting (or shearing) and suturing functions; a transmission unit for transmitting power to the execution unit; a control unit for controlling the timing process of realizing the above functions; a power unit for outputting power for clamping, cutting and suturing; a battery unit for powering the motor and circuit. A clamping and holding unit for maintaining the closing handle 62 in a closed state; an automatic reset unit for automatically resetting the rotating head in an unlocked state.

[0035] The execution unit includes the above-mentioned cutting subunit 1, suturing subunit 2 and clamping subunit 3, and the clamping subunit 3 is used to complete the clamping action on the treatment object. The clamping subunit 3 includes a nail support 32 and a nail magazine support 31, and the rear end of the nail magazine support 31 and the rear end of the nail support 32 can be connected in an openable and closable manner, and the clamping action on the treatment object is achieved by closing the two. The suturing subunit 2 is installed on the clamping subunit 3, and the suturing subunit 2 is used to complete the suturing action on the treatment object. The cutting subunit 1 is used to cut the treatment object after the suturing action.

[0036] It should be noted that, without violating the design concept of the utility model, the parts not mentioned or described in detail in this specification may adopt relevant existing technologies, for example, the existing technologies disclosed by the applicant of the utility model before the filing date of the present application may be adopted, for example, the technology adopted in the Chinese patent publication text with the subject matter being a laparoscopic stapler and publication number CN106073840A may be adopted.

[0037] In this specification, for the convenience of explanation, it is defined that the extension direction of the first knife groove 311 is consistent with the axial direction of the barrel of the stapler, and extends in the front-to-back direction, that is, in the X-axis direction, the rotation axis of the staple cartridge seat 31 and the staple support seat 32 when opening and closing is in the left-right direction, that is, in the Y-axis direction, the groove width direction of the first knife groove 311 is consistent with the left-right direction, and the groove depth direction of the first knife groove 311 is consistent with the up-down direction, that is, in the Z-axis direction. After the clamping subunit 3 completes the clamping of the treatment object, when the staple pusher 23 moves from the back to the front, it can push the staples in the suturing subunit 2 to move, that is, the firing of the staples to suturing the treatment object.

[0038] However, it should be understood that in actual use, it is not limited to this. For example, the stapler may also include a rotation transmission subunit 7 (see Figure 3 , Figure 5 ), which is used to transmit the rotational action (rotation around the axis of the barrel) to the execution unit, and can also include a turning transmission sub-unit, for example, after the clamping sub-unit 3 and its upper parts are rotated, the extension direction of the first tool groove 311 is set at an angle with the axial direction of the barrel, which can be specifically configured by using relevant technologies.

[0039] The setting direction is perpendicular to the first tool groove 311. In this specification, the limiting cavity structure 312 is located at the rear end of the first tool groove 311 and is connected to the first tool groove 311 in the up and down directions.

[0040] In this way, the cutting knife 11 is located behind the nail pushing member 23 along its nail pushing direction, and the cutting knife 11 and the nail pushing member 23 are detachably positioned and connected in the nail pushing direction. When the cutting knife 11 is positioned and connected to the nail pushing member 23, along the extension direction of the first knife groove 311, that is, along the front-to-back direction, when a force is applied to the cutting knife 11 from back to front, the first guide block 111 of the cutting knife 11 can be docked with the first knife groove 311. Under the guiding action of the first knife groove 311, the cutting knife 11 can drive the nail pushing member 23 positioned and connected thereto to move from back to front, and the nail pushing member 23 pushes the staples to move, that is, the staples are fired to sew the treatment object. At the same time, the cutting knife 11 completes the cutting process on the treatment object. When the cutting knife 11 is not positioned and connected to the nail pushing member 23 and the cutting knife 11 is located at the rear end of the first knife groove 311, under the action of the elastic reset structure 12, the first guide block 111 of the cutting knife 11 1 leaves the position where it can dock with the first knife groove 311 and moves to be accommodated in the limiting cavity structure 312, that is, the projection of the first guide block 111 of the cutting knife 11 along the extension direction of the first knife groove 311 at least partially falls outside the groove cavity of the first knife groove 311 of the clamping subunit 3, even if a force is applied to the cutting knife 11 from back to front along the front-to-back direction, the first guide block 111 of the cutting knife 11 cannot dock with the first knife groove 311 smoothly, for example, the first guide block 111 of the cutting knife 11 will abut against the side wall of the limiting cavity structure 312 near the front end, thereby limiting the cutting knife 11 from continuing to move forward, avoiding the erroneous triggering of the cutting function of the cutting knife 11, especially avoiding the erroneous triggering of the cutting function of the cutting knife 11 when the staple pusher 23 of the suturing subunit 2 is located near the front end and separated from the cutting knife 11 (for example, there is no staple in the suturing subunit 2 and it is mistakenly installed in the clamping subunit 3). In general, the utility model can take into account the requirements of both suturing and cutting functions, and can also avoid the false triggering of the cutting function when the situation is not suitable for suturing and cutting, thereby improving the safety of the stapler.

[0041] like Figure 1 and Figure 2 As shown, optionally, the stapler also includes a cutting transmission subunit 4 for transmitting cutting driving force, the cutting transmission subunit 4 includes a push rod 41 located at the front end, the push rod 41 is connected to the cutting knife 11, and the elastic reset structure 12 acts on the cutting knife 11 by acting on the push rod 41.

[0042] Of course, the elastic reset structure 12 can also act directly on the cutting knife 11. The way in which the elastic reset structure 12 acts on the cutting knife 11 to move the first guide block 111 is not limited. For example, the first guide block 111 can move relative to the body of the cutting knife 11, and the elastic reset structure 12 acts between the first guide block 111 and the body of the cutting knife 11. It will not be described in detail here.

[0043] In this way, the elastic reset structure 12 acts on the pusher rod 41 and thus indirectly acts on the cutting knife 11, rather than directly acting on the cutting knife 11, which can reduce the structural complexity of the cutting knife 11 and the demand for the cutting knife 11 to occupy the surrounding space. The structure is simple and practical.

[0044] like Figure 1 and Figure 2 As shown, optionally, the push knife rod 41 includes a first section 411 and a second section 412 distributed from back to front, the front end of the second section 412 is connected to the cutting knife 11, the elastic reset structure 12 is used to act on the second section 412, and the first section 411 and the second section 412 are transitionally connected via a weakening structure. When the elastic reset structure 12 acts on the second section 412, the push knife rod 41 is deformed at the weakening structure.

[0045] Specifically, the structural rigidity of the pusher rod 41 at the weakened structure is smaller than that at other positions. When the two ends of the pusher rod 41 are subjected to inconsistent radial forces, deformation occurs preferentially at the weakened structure.

[0046] In this way, when the cutting knife 11 is not positioned and connected with the nail pushing member 23 and the cutting knife 11 is located at the rear end of the first knife groove 311, the elastic reset structure 12 acts on the second section 412, and the deformation of the knife pushing rod 41 at the weakened structure satisfies the requirement of the second section 412 to be offset relative to the first section 411, so that the cutting knife 11 connected to the second section 412 can be displaced and misaligned with the first knife groove 311, thereby preventing the cutting function from being triggered by mistake. The displacement effect of the cutting knife 11 on the end of the knife pushing rod 41 away from the cutting knife 11 can be reduced, and the position stability of the knife pushing rod 41, such as the first section 411, can be ensured.

[0047] Optionally, the weakened structure is a bending structure 413 .

[0048] That is to say, by designing the bending structure between the first section 411 and the second section 412 , the pusher rod 41 is deformed preferentially at the portion between the first section 411 and the second section 412 , thereby satisfying the displacement requirement of the front end of the second section 412 caused by the displacement requirement of the cutting knife 11 .

[0049] The forming method of the bending structure 413 is not limited, and it can be formed by bending with a bending machine or by machining. After the bending structure 413 is provided, the push rod 41 is a multi-segment structure as a whole, and two adjacent segments are arranged at an angle. Figure 1 and Figure 2 As shown, it shows that the push rod 41 is in three sections, but it is not intended to be limiting. For example, the push rod 41 can be in more sections.

[0050] However, it should be understood that the design of the weakened structure should not have a significant impact on the thrust transmission between the first section 411 and the second section 412 along the front-to-back direction, so as to avoid affecting the position control accuracy of the cutting knife 11 during the normal cutting function. This can be determined in combination with specific tests and will not be described in detail here.

[0051] like Figure 1 and Figure 2 As shown, optionally, the extension direction of the bending line of the bending structure 413, the setting direction and the first tool groove 311 are arranged crosswise in pairs.

[0052] It should be understood that the bending line of the bending structure 413 is a transition line formed by its bending. For example, when the pusher rod 41 in the figure includes three sections arranged at an angle, the transition lines between two adjacent sections all form a bending line.

[0053] The first cutting groove 311 extends along the front-to-back direction, and the setting direction is consistent with the up-down direction. The bending line of the bending structure 413 extends along the left-to-right direction.

[0054] In this way, when the second section 412 is subjected to force, for example, the elastic reset structure 12, the second section 412 can approximately move with the bending line of the bending structure 413 as the center to meet the corresponding needs. The structure is simple and practical.

[0055] like Figure 1 and Figure 2 As shown, optionally, along the above set direction, the distance from one end of the bending structure 413 close to the second section 412 to the first tool groove 311 is smaller than the distance from one end of the bending structure 413 away from the second section 412 to the first tool groove 311 .

[0056] Exemplarily, the limiting cavity structure 312 is connected to the first tool groove 311 below the first tool groove 311, that is, the limiting cavity structure 312 is connected to the first tool groove 311 at the bottom of the first tool groove 311. At this time, the distance from the front end of the bending structure to the first tool groove 311 is smaller than the distance from the rear end of the bending structure to the first tool groove 311, so that the rear end of the second section 412 is closer to the first groove than the front end of the first section 411. It can avoid that the front end of the push rod 41 occupies too much space due to the setting of the bending structure 413, especially avoid that the space requirement for the upper part of the front end of the push rod 41 is too large.

[0057] like Figure 2 and Figure 4 As shown, in the above embodiment, optionally, the rear end of the nail pusher 23 and the front end of the cutting knife 11 are respectively provided with a first positioning structure 231 and a second positioning structure 112, and the first positioning structure 231 and the second positioning structure 112 are respectively provided with a guide surface structure.

[0058] When the nail pusher 23 and the cutting knife 11 approach each other in the front-to-back direction, the guide surface structure of the first positioning structure 231 and the guide surface structure of the second positioning structure 112 contact each other. Through the guiding effect of the guide surface structure, the first positioning structure 231 and the second positioning structure 112 can be smoothly positioned and connected.

[0059] It should be understood that the suturing subunit 2 usually includes a nail magazine 21, a nail magazine cover 22, a nail seat and a nail pushing member 23. Several rows of staples are installed in the nail magazine 21 through the nail seat. The nail magazine cover 22 is located at the bottom of the nail magazine 21. The suturing subunit 2 is installed on the nail magazine seat 31 through the nail magazine cover 22, for example, it is installed in the groove structure of the nail magazine seat 31. The nail pushing member 23 is slidable in the front and rear directions, and is partially located between the nail magazine 21 and the nail magazine cover 22. When the nail pushing member 23 slides from back to front, the nail seat drives the staples thereon to move upward through the contact with the nail seat (the contact surface is usually an inclined surface or an arc surface), that is, the staples are fired. The staples are deformed by the action with the nail support seat 32, for example, deformed into a B shape.

[0060] In this way, even before the nail pushing member 23 and the cutting knife 11 are positioned and connected, the first guide block 111 of the cutting knife 11 is misaligned with the first tool groove 311, and the first guide block 111 is located in the limiting cavity structure 312. When the nail pushing member 23 and the cutting knife 11 approach each other in the front-to-back direction, the position of the first guide block 111 of the cutting knife 11 can be corrected through the guiding action of the guide surface structure, so that when force is applied to the pushing rod 41 from back to front, the first guide block 111 can be smoothly docked with the first tool groove 311.

[0061] Optionally, the first positioning structure 231 is a cushion block structure, and the second positioning structure 112 is a pressure block structure.

[0062] At this time, a guide surface structure is provided at the rear upper end of the pad block structure, and a guide surface structure is provided at the front lower end of the pressure block structure. The first guide block 111 can move upward through the contact of the two guide surface structures, so that it can dock with the first tool groove 311.

[0063] like Figure 1 , Figure 2 and Figure 4 As shown, in the above embodiment, optionally, a limiting groove structure 414 is provided at the front end of the push tool rod 41, and an open mouth 4141 is provided at the rear end of the limiting groove structure 414, and the open mouth 4141 is used for the passage of the elastic reset structure 12; the elastic reset structure 12 is used to act on the set side wall 4142 of the limiting groove structure 414 inside the limiting groove structure 414, and in the direction in which the first tool groove 311 and the limiting cavity structure 312 are distributed sequentially along the set direction, the part of the elastic reset structure 12 acting on the set side wall 4142 and the set side wall 4142 are distributed sequentially.

[0064] like Figure 1 and Figure 2 As shown, the first tool groove 311 and the limiting cavity structure 312 are distributed in sequence from top to bottom in the up and down directions, and the part of the elastic reset structure 12 acting on the set side wall 4142 and the set side wall 4142 are distributed in sequence from top to bottom, that is, the set side wall 4142 is the lower side wall of the limiting groove structure 414.

[0065] With this arrangement, the elastic reset structure 12 can take various relative positions, such as being located inside the limiting groove structure 414 or outside the limiting groove structure 414 , according to the different movement positions of the pusher rod 41 in the front-rear direction.

[0066] Thus, when the cutting blade 11 is located at the rear end of the first blade groove 311, the elastic reset structure 12 can be at least partially accommodated by the limiting groove structure 414 to protect the elastic reset structure 12. At the same time, the elasticity acts on the set side wall 4142, so that the cutting blade 11 is applied through the second section 412, which has a simple structure and strong practicality.

[0067] Optionally, along the set direction, the limiting groove structure 414 is located at one end of the pusher rod 41 close to the limiting cavity structure 312, and the groove width direction of the limiting groove structure 414 is consistent with the set direction.

[0068] Specifically, the limiting groove structure 414 is located at the lower end of the second section 412 of the pusher rod 41 , the groove width direction of the limiting groove structure 414 is consistent with the up and down direction, and the side wall 4142 is set as the lower side wall of the limiting groove structure 414 .

[0069] In this way, the position of the limit groove structure 414 and the limit cavity structure 312 in the set direction is relatively close, and the position of the set side wall 4142 and the limit cavity structure 312 in the set direction is relatively close. The position setting of the limit groove structure 414 and the set side wall 4142 is relatively reasonable, which is convenient for the setting and force application of the elastic reset structure 12, and has a simple structure and strong practicality.

[0070] like Figure 2 As shown, optionally, the elastic reset structure 12 includes a spring structure.

[0071] In this way, the elastic force of the spring structure can be used to directly act on the set side wall 4142, and the elastic reset structure 12 has a simple structure and high reliability.

[0072] Furthermore, the fixed end 121 of the spring sheet structure is located behind the limiting groove structure 414 and is fixed relative to the first cutting groove 311 , and the free end 122 of the spring sheet structure is located in front of the fixed end 121 of the spring sheet structure.

[0073] In this way, the shrapnel structure is mainly distributed along the front-to-back direction, avoiding the shrapnel structure being distributed along the circumference of the barrel, and avoiding the influence on the performance of the stapler due to the excessive diameter of the barrel caused by the arrangement of the shrapnel structure.

[0074] Furthermore, from front to back, the distance from the point on the portion of the spring structure extending into the limiting groove structure 414 to the limiting cavity structure 312 gradually decreases.

[0075] That is to say, from front to back, the position of the portion of the spring structure extending into the limiting groove structure 414 gradually decreases in the up-down direction.

[0076] In this way, it is convenient for the front end of the spring sheet structure to extend into the limiting groove structure 414 or escape from the limiting groove structure 414 through the open mouth 4141. For example, when force is applied to the push knife rod 41 from back to front and the first guide block 111 is connected to the first tool groove 311, the force continues to be applied, and the free end 122 of the spring sheet structure can escape from the limiting groove structure 414 through the open mouth 4141. When the suturing function and the cutting function are completed and force is applied to the push knife rod 41 from front to back (generally, the push knife rod 41 is pulled to move from front to back), the free end 122 of the spring sheet structure can enter the limiting groove structure 414 through the open mouth 4141.

[0077] In the above embodiment, optionally, the limiting groove structure 414 is provided with a protrusion structure 4143 on the set side wall 4142 for contacting the elastic reset structure 12 .

[0078] In this way, when the protruding structure 4143 contacts the elastic reset structure 12, such as a spring structure, the elastic reset structure 12 can obtain a larger elastic deformation through the contact between the two, thereby obtaining a larger elastic potential energy.

[0079] In the above embodiment, optionally, a limiting hole 123 is provided at the portion of the spring structure extending into the limiting groove structure 414 , and the limiting hole 123 is used to partially accommodate the protruding structure 4143 .

[0080] like Figure 2 As shown, when the protruding structure 4143 is partially accommodated in the limiting hole 123, the pressure on the spring structure is relatively small, thereby improving the stress condition of the push rod 41 under this condition. When force is applied to the push rod 41 from back to front, the protruding structure 4143 will press the spring structure upward. Under the elastic force of the spring structure, the second section 412 of the push rod 41 is offset downward, so that the first guide block 111 of the cutting knife 11 enters the limiting cavity structure 312.

[0081] Optionally, guide surfaces are provided at both the front and rear ends of the protruding structure 4143. Thus, the protruding structure 4143 and the elastic reset structure 12 are in smooth contact, and the elastic force of the spring structure changes smoothly, which can improve the stress state of the pusher rod 41 and increase its service life.

[0082] In the above embodiment, it is required to explain that, in the initial state where the execution unit and the transmission unit of the stapler are not in action, the first guide block 111 of the cutting knife 11 can be collinear with the first knife groove 311 in the front-to-back direction, that is, the first guide block 111 is in a state where it does not enter the limiting cavity structure 312, but when the nail pushing member 23 is not docked with the cutting knife 11, if the knife pushing rod 41 is pushed forward, the cutting knife 11 will move forward, and when the first guide block 111 of the cutting knife 11 moves to the top of the limiting cavity structure 312, under the reset action of the elastic reset structure 12, the cutting knife 11 moves downward, so that the first guide block 111 enters the limiting cavity structure 312 and is offset from the first knife groove 311. In this case, in the above initial state, the outer wall surface corresponding to the set side wall 4142 can be supported by the upper surface of the nail magazine seat 31, for example, the back of the protruding structure 4143 is supported, so that the free end 122 of the spring structure is in a state after moving upward, and at this time, the spring has a large initial elastic potential energy.

[0083] Of course, in another embodiment, in the initial state where the execution unit and the transmission unit of the stapler are not in action, the first guide block 111 is in a state of entering the limiting cavity structure 312 and being offset from the first knife groove 311. In this case, optionally, the force when the suture subunit 2 is installed on the staple cartridge seat 31 is used to make the nail pusher 23 dock with the cutting knife 11, so that the first guide block 111 of the cutting knife 11 is in a state of being colinear with the first knife groove 311 and can dock with the first knife groove 311. For example, the suture subunit 2 is pushed from front to back so that the suture subunit 2 is assembled into the groove structure of the staple cartridge seat 31.

[0084] In the above embodiment, optionally, the anvil seat 32 of the clamping subunit 3 is provided with a second tool groove 321 , and the cutting knife 11 is further provided with a second guide block 114 , and the second guide block 114 is used to dock with the second tool groove 321 .

[0085] The cross-sectional shape of the first tool groove 311 and the second tool groove 321 is generally T-shaped, the first guide block 111 is connected to the transversely extending portion of the first tool groove 311, and the second guide block 114 is connected to the transversely extending portion of the second tool groove 321, which will not be described in detail here.

[0086] In this way, when the cutting knife 11 moves from front to back, the cutting knife 11 has a reliable movement guide, and can also prevent the nail magazine seat 31 and the nail support seat 32 from moving away from each other during the cutting process.

[0087] like Figure 2 and Figure 4As shown, in the above embodiment, optionally, a limit block 113 is provided on the cutting knife 11. When the cutting knife 11 is not positioned and connected with the nail pushing member 23 and the cutting knife 11 is located at the rear end of the first cutting groove 311, the limit block 113 is used to abut against the clamping subunit 3 in a set direction to limit the displacement of the first guide block 111 along the set direction toward the side close to the limit cavity structure 312.

[0088] Exemplarily, the limiting block 113 abuts against the inner surface of the groove structure of the nail magazine seat 31 .

[0089] like Figure 4 As shown, illustratively, the inner surface of the groove structure of the nail magazine seat 31 is provided with a groove 313 corresponding to the limiting cavity structure 312, and the limiting block 113 abuts against the inner bottom surface of the groove 313. Thus, the displacement of the first guide block 111 of the cutting knife 11 along the set direction toward the side close to the limiting cavity structure 312 is limited, ensuring that the second positioning structure 112 of the cutting knife 11 and the first positioning structure 231 of the nail pushing member 23 are in a state where they can be connected.

[0090] Of course, it should be understood that when the second positioning structure 112 of the cutting knife 11 and the first positioning structure 231 of the nail pushing member 23 are connected, the suturing sub-unit 2 should avoid the limit block 113 in the front and rear directions. For example, the limit block 113 can be avoided with the help of the slide of the nail pushing member 23, which will not be explained in detail here.

[0091] like Figure 3 and Figure 5 As shown, optionally, the stapler further includes a safety subunit 5 and a trigger subunit 6 ; the trigger subunit 6 includes a trigger 61 , the trigger 61 is used to trigger the driving action of the cutting knife 11 by rotation, and the safety subunit 5 is used to lock or unlock the trigger 61 .

[0092] Specifically, the trigger subunit 6, the insurance subunit 5 and other related parts can adopt the technology adopted in the above-mentioned Chinese patent publication with publication number CN106073840A.

[0093] For example, the trigger subunit 6 also includes a closing handle 62, a locking pin, a transmission rod 42, a transmission pin, a transmission pin and a firing switch. The closing handle 62 is connected to the main body of the stapler through the locking pin, the transmission rod 42 is hinged to the closing handle 62 through the transmission pin, and the trigger 61 is connected to the closing handle 62 through the transmission pin. When the locking tail end on the closing handle 62 is pressed, the other end of the closing handle 62 rotates accordingly, driving each connecting member to achieve a clamping action. When the trigger 61 is pressed, the trigger 61 contacts the firing switch during the rotation process, and the firing switch is used to trigger the fourth button. By pressing the trigger 61, the fourth button is in a triggered state (it can also simultaneously satisfy the fifth button in CN106073840A to be in a non-triggered state), the motor works, and the motor drives the gear rod 43 to move toward the direction of the nail support 32, the gear rod 43 drives the pusher rod 41 to move, and the pusher rod 41 drives the cutting knife 11 to cut the treatment object (reference Figure 4 ).

[0094] For example, the safety subunit 5 includes a safety knob 51 and a safety 52 linked to the safety knob 51. For example, the safety 52 is coaxially arranged and connected to the safety knob 51. When the safety knob 51 is rotated to a preset position, the safety 52 abuts against the trigger 61 to prevent the trigger 61 from being triggered, so that the safety subunit 5 can lock or unlock the trigger 61. When the safety 52 abuts against the trigger 61, the contact portion of the two can be set as a toothed structure, or a blocking beam can be set on the trigger 61, which is not a limitation.

[0095] In this embodiment, the trigger 61 can trigger the cutting function only when the safety subunit 5 unlocks the trigger 61. After the cutting function is triggered, that is, after the suturing and cutting actions are completed, the cutting knife 11 returns to the initial position. If the trigger 61 is triggered by mistake before the trigger 61 is locked by the safety subunit 5, since the nail pushing member 23 and the cutting knife 11 are not positioned and connected at this time, under the action of the elastic reset structure 12, the first guide block 111 of the cutting knife 11 is misaligned with the first knife groove 311. Even if the cutting knife 11 moves forward, it will only abut against the front side wall of the limiting cavity structure 312, and will not enter the first knife groove 311 to perform cutting operations without staples. That is, it can prevent the cutting knife 11 from being triggered by mistake, with high safety and strong practicality.

[0096] Although the utility model is disclosed as above, the protection scope of the utility model is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model, and these changes and modifications will fall within the protection scope of the utility model.

Claims

1. A stapler, characterized in that: The invention comprises a cutting subunit (1), a suturing subunit (2) and a clamping subunit (3); the suturing subunit (2) is mounted on the clamping subunit (3), and the suturing subunit (2) comprises a nail pushing member (23); the clamping subunit (3) is provided with a first knife groove (311) and a limiting cavity structure (312), the limiting cavity structure (312) is located at the rear end of the first knife groove (311) and is connected to the first knife groove (311) in a set direction perpendicular to the first knife groove (311); the cutting subunit (1) comprises a cutting knife (11) and an elastic reset structure (12), the cutting knife (11) is located behind the nail pushing member (23), and the cutting knife (11) and the nail pushing member (23) are connected to each other. The cutting knife (11) is detachably connected to the nail pushing member (23), and a first guide block (111) is provided on the cutting knife (11); when the cutting knife (11) is connected to the nail pushing member (23), the first guide block (111) is used to dock with the first knife groove (311), and the cutting knife (11) is used to drive the nail pushing member (23) to move; when the cutting knife (11) is not connected to the nail pushing member (23) and the cutting knife (11) is located at the rear end of the first knife groove (311), the elastic reset structure (12) is used to act on the cutting knife (11) so that the first guide block (111) and the first knife groove (311) are misaligned and accommodated in the limiting cavity structure (312).

2. The stapler according to claim 1, characterized in that: The invention also comprises a cutting transmission subunit (4) for transmitting a cutting driving force, wherein the cutting transmission subunit (4) comprises a knife pushing rod (41) located at a front end, the knife pushing rod (41) is connected to the cutting knife (11), and the elastic reset structure (12) acts on the cutting knife (11) by acting on the knife pushing rod (41).

3. The stapler according to claim 2, characterized in that: The pusher rod (41) comprises a first section (411) and a second section (412) distributed from back to front, the front end of the second section (412) is connected to the cutting knife (11), the elastic reset structure (12) is used to act on the second section (412), the first section (411) and the second section (412) are transitionally connected via a weakening structure, and when the elastic reset structure (12) acts on the second section (412), the pusher rod (41) is used to deform at the weakening structure.

4. The stapler according to claim 3, characterized in that: The weakening structure is a bending structure (413), and the extension direction of the bending line of the bending structure (413), the set direction and the first tool groove (311) are arranged crosswise in pairs.

5. The stapler according to any one of claims 2 to 4, characterized in that: The pusher rod (41) is provided with a limiting groove structure (414) at the front end, and an open mouth (4141) is provided at the rear end of the limiting groove structure (414), and the open mouth (4141) is used for the passage of the elastic reset structure (12); the elastic reset structure (12) is used to act on the set side wall (4142) of the limiting groove structure (414) inside the limiting groove structure (414), and in the direction in which the first tool groove (311) and the limiting cavity structure (312) are distributed in sequence along the set direction, the part of the elastic reset structure (12) acting on the set side wall (4142) and the set side wall (4142) are distributed in sequence.

6. The stapler according to claim 5, characterized in that: Along the set direction, the limiting groove structure (414) is located at one end of the knife-pushing rod (41) close to the limiting cavity structure (312), and the groove width direction of the limiting groove structure (414) is consistent with the set direction.

7. The stapler according to claim 5, characterized in that: The elastic reset structure (12) comprises a spring sheet structure, and the limiting groove structure (414) is provided with a protrusion structure (4143) on the set side wall (4142) for contacting the spring sheet structure.

8. The stapler according to claim 7, characterized in that: The fixed end (121) of the spring sheet structure is located behind the limiting groove structure (414) and is fixedly arranged relative to the first tool feeding groove (311), and the free end (122) of the spring sheet structure is located in front of the fixed end (121) of the spring sheet structure; and / or, from front to back, the distance from the point on the portion of the spring structure extending into the limiting groove structure (414) to the limiting cavity structure (312) gradually decreases; And / or, the portion of the spring structure extending into the limiting groove structure (414) is provided with a limiting hole (123), and the limiting hole (123) is used to partially accommodate the protruding structure (4143); And / or, the protruding structure (4143) is provided with guide surfaces at both the front and rear ends.

9. The stapler according to any one of claims 1 to 4, characterized in that: The rear end of the nail pushing member (23) and the front end of the cutting knife (11) are respectively provided with a first positioning structure (231) and a second positioning structure (112); the first positioning structure (231) and the second positioning structure (112) are respectively provided with a guide surface structure.

10. The stapler according to any one of claims 1 to 4, characterized in that: It also comprises a safety subunit (5) and a trigger subunit (6); the trigger subunit (6) comprises a trigger (61), the trigger (61) is used to trigger the driving action of the cutting knife (11) by rotation, and the safety subunit (5) is used to lock or unlock the trigger (61); And / or, a limiting block (113) is provided on the cutting knife (11), and when the cutting knife (11) is not positioned and connected with the nail pushing member (23) and the cutting knife (11) is located at the rear end of the first knife groove (311), the limiting block (113) is used to abut against the clamping subunit (3) in the set direction to limit the displacement of the first guide block (111) along the set direction toward a side close to the limiting cavity structure (312); And / or, the clamping subunit (3) comprises a nail magazine seat (31) and a nail anvil seat (32), the rear end of the nail magazine seat (31) is connected to the rear end of the nail anvil seat (32), and the nail magazine seat (31) and the nail anvil seat (32) can be opened and closed, the suturing subunit (2) is installed on the nail magazine seat (31), the nail magazine seat (31) is provided with the first cutting groove (311); the nail anvil seat (32) is provided with the second cutting groove (321), and the cutting knife (11) is also provided with a second guide block (114), and the second guide block (114) is used to dock with the second cutting groove (321).

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