WO2019233094A1

WO2019233094A1 - Nail box assembly for anastomat

Info

Publication number: WO2019233094A1
Application number: PCT/CN2018/125615
Authority: WO
Inventors: 郭毅军; 吴治中; 钟定恩
Original assignee: 重庆西山科技股份有限公司
Priority date: 2018-06-06
Filing date: 2018-12-29
Publication date: 2019-12-12

Abstract

A nail box assembly for an anastomat, comprising a nail box front end assembly (100) and a nail box rear end assembly (300) which are connected by means of a bending executing mechanism (200). The nail box rear end assembly (300) comprises a housing and a pull rod (304) provided in the housing, a push broach blade (303), and a safety structure; the front end of the push broach blade (303) is connected to a cutting knife (101) of the nail box front end assembly (100); the front end of the pull rod (304) is connected to the bending executing mechanism (200); an inner cavity of the housing provides an activity space for forward and backward movements of the push broach blade (303) and the safety structure; the push broach blade (303) is located at an upper portion of the inner cavity of the housing; the safety structure comprises a connecting seat (305) and an executive element; the rear of the push broach blade (303) is connected to the connecting seat (305); the executive element is located at a lower portion of the inner cavity of the housing; the push broach blade (303) is connected to the cutting knife (101) by passing through an upper portion of the bending executing mechanism (200). The push broach blade (303) is narrowed with respect to an existing structure, and occupies a smaller part of space of the housing, so as to facilitate the arrangement of the safety structure in the housing; moreover, after the width of the push broach blade (303) is narrowed, the resistance required to be overcome during bending is reduced, and the housing is bent at a larger angle under the same operating force.

Description

Stapler staple cartridge assembly

Technical field

The present invention relates to the field of medical equipment, and in particular, to a stapler cartridge assembly.

Background technique

At present, the endoscopic cutting stapler is mainly divided into three types: disposable manual endoscopic cutting stapler, disposable electric endoscopic cutting stapler, and electric cutting stapler. Among them, the most widely used is the electric cutting stapler. The electric cutting anastomat is mainly composed of a power handle, a connecting rod, and a magazine component, etc. The power from the power supply can realize the cutting anastomosis, bending and rotation of the magazine component by driving different transmission mechanisms, so as to adapt to cutting at different angles in a complex environment Fit.

The staple assembly of the existing stapler is mainly composed of a front end component with a staple cartridge and a rear end component for connecting with a connecting rod. The front end component is rotationally connected to the rear end component, and the front end is specifically driven by a pull rod in the rear end component. Component, which enables the front-end component to rotate around the rear-end component, thereby realizing the bending and angle adjustment of the magazine component. In the prior art, in order to ensure the pushing force of the push blade, a wide width of the push blade is used, which occupies almost the entire width of the housing. The middle part of the push blade is provided with a slot for mounting and installation of other components in the front-rear direction. Due to the large width of the push blade, the operating force required for bending is also large. In addition, because the push blade occupies a large space, it is not convenient to arrange the insurance structure in the housing. In addition, the existing insurance structure is complicated, the components are numerous, the assembly is cumbersome, and the risk of failure of the actuator is large.

Summary of the Invention

The object of the present invention is to provide a stapler stapler assembly to solve at least one of the above problems in the prior art.

To achieve the above and other related objectives, the technical solution of the present invention is as follows:

A stapler staple cartridge assembly includes a staple cartridge front end component and a staple cartridge rear end component connected by a turning actuator, and the staple cartridge rear end component includes a casing and a pull rod, a push blade and a fuse provided in the casing. Structure, the front end of the push blade is connected with the cutter of the front end component of the magazine, the front end of the pull rod is connected with the turning actuator, the inner cavity of the housing provides a space for the forward and backward movement of the push blade and the safety structure, and the push blade It is located at the upper part of the inner cavity of the housing, the safety structure includes a connecting seat and an execution element, the rear part of the push blade is connected with the connecting seat, and the actuator is located at the lower part of the inner cavity of the housing; The upper part of the actuator is connected with the cutter.

With the above-mentioned arrangement structure, the push blade is narrower than the existing structure, for example, it is only half the size of the existing structure. By occupying a small space in the housing, more space is reserved for the insurance structure, which facilitates the safety structure. The arrangement in the housing; and after the width of the push blade is narrowed, the resistance to be overcome during bending is reduced, and a larger angle can be bent under the same operating force. The arrangement structure is distributed up and down, which is convenient to assemble, does not interfere with each other, and has a compact structure.

Further, the housing includes an upper case and a lower case, the execution element includes a stop block and an elastic retaining element, the stop block is rotatably mounted on the connecting seat, and the elastic retaining element is connected with the stop block, The free end of the stop block is pressed toward the bottom of the lower case, and the connecting seat and the stop block move along the axial direction of the housing with the pushing blade under the action of a firing force. A change structure and In the stop position structure, the stop block rotates and changes direction under the action of the direction changing structure during the completion of the ejection of the push blade in one firing, and abuts against the stop structure during the second firing to prevent the push blade from moving forward.

Further, the direction changing structure is an avoidance groove provided on the lower shell, and the stopper block extends into the avoidance groove during the first firing and retreating process, and is directed toward the rear groove wall of the avoidance groove. Rotate forward and exceed the position where the stop block is perpendicular to the lower case.

Further, a limiting groove is provided on the lower shell at the rear of the direction changing structure, the front wall of the limiting groove forms the stop structure, and the rear wall of the limiting groove forms a stop for the stop block to move backward. point.

Further, a first chute corresponding to the stopper and a second chute corresponding to the connecting seat are axially provided on the lower shell, and the stopper can move forward and backward along the first chute, The connecting seat is located in the second chute and can move back and forth along the second chute. The position of the first chute is lower than the second chute; the bottom of the second chute and the bottom of the push blade A stopper structure is formed along the stopper block to limit the rotation range of the stopper block. A stopper is provided on the stopper block or the elastic retaining element. During the rotation of the stopper block, the stopper abuts against the pushing blade or the second slide. Limits are achieved on the groove bottom.

Further, the rear end of the push blade has a hook portion, and the rear portion of the push blade forms an extension portion inward, and the extension portion extends into the connecting seat.

Further, the turning actuator includes a connecting member and a first joint and a second joint respectively hinged with the connecting member. The first joint is connected to the front end component of the nail box, and the second joint is connected to the rear end component of the nail box. The joint and the second joint have oppositely arranged arc-shaped portions, the arc-shaped portions are provided with teeth, the first joint and the second joint are engaged by the teeth, and the pull rod is rotatably connected with the connecting member.

Further, the connecting member includes a connecting sleeve, and a supporting seat, a supporting block and a pressing block which are sequentially connected up and down. The pressing block, the supporting block and the supporting seat are installed in the connecting sleeve, and the first joint and the second joint The joint part of the joint is located between the support block and the pressing block. The first joint and the second joint are connected to the support block respectively for rotation. The support seat is provided with a support groove, and the push blade passes through the support groove.

Further, the support groove gradually expands from the middle to the two ends, and the groove wall of the support groove is an arc-shaped structure facing away from each other. A support frame is provided on the outer side of the push blade, and both ends of the support frame are respectively disposed at the front end of the magazine. On the component and the rear end component of the magazine, the support frame and the push blade pass through the support groove. When the front end component of the magazine is turned, the middle portion of the support frame abuts on the arc structure.

Further, a strip-shaped hole is provided in the support frame along the length direction, and the strip-shaped hole runs through the thickness direction of the support frame.

An stapler staple cartridge assembly includes a staple cartridge front end assembly and a staple cartridge rear end assembly connected by a turning actuator; wherein the staple cartridge front end assembly includes a cutter; the staple cartridge rear end assembly includes a housing and A pull rod, a push blade and a safety structure installed in the housing; a front end of the push blade is connected to the cutting blade, a front end of the pull rod is connected to the turning actuator; the push blade and the The safety structure is connected and adapted to move back and forth in the housing; the safety structure includes: a connecting seat, a pawl and an elastic retaining element; the connecting seat is connected to the rear of the push blade, and the first part of the pawl One end is hinged with the connection seat, and a sliding surface slidingly fitted with the pawl is provided in the housing, and the second end of the pawl is elastically abutted against the slide under the action of the elastic retaining element. A protrusion is arranged on the sliding surface, and an avoiding groove is provided at a position of the sliding surface in front of the protrusion; when the push blade moves from the initial position to the front and rear, the first part of the pawl The two ends pass through the protrusion and the The avoidance groove continues to elastically abut against the sliding surface; when the push blade moves from front to back, the pawl flips when passing through the escape groove to continue to move backward through the protrusion, The second end of the pawl is abutted against the protrusion to restrict the forward movement of the push blade again.

By adopting the stapler staple box assembly, the safety structure is simple and easy to assemble, and it can reliably prevent the secondary firing of the push blade and realize the safety function.

Further, the push blade is located at an upper portion of the inner cavity of the housing, and the pawl and the elastic retaining element are located at a lower portion of the inner cavity of the housing.

Further, the elastic retaining element is an elastic piece, and the first end of the elastic piece is fixedly connected to the first end of the pawl; the housing is provided with an opposite first abutment plane and a second abutment. Before the pawl is flipped, the second end of the elastic sheet abuts against the first abutting plane; after the pawl is flipped, the second end of the elastic sheet abuts against the second Plane abut.

Further, the first end of the pawl and the rotation center of the connection seat are located between the first abutting plane and the second abutting plane.

Further, the second end of the elastic sheet is provided with a contact sheet.

Further, the connecting seat is provided with a mounting groove, and the push blade is provided with an extension portion that extends into the mounting groove, and the extension portion is adapted to abut against the groove wall of the mounting groove.

Further, the connecting seat is provided with a positioning groove, and the rear end of the push blade is provided with a hook portion that extends into the positioning groove, and the hook portion is located behind the extension portion.

Further, a portion of the connection seat between the mounting groove and the positioning groove is snapped between the extension portion and the hook portion.

Further, the connecting seat is slidingly fitted to the housing, and a rotation-prevention cutting surface for restricting relative rotation between the connecting seat and the housing is provided.

Further, the turning actuator includes a connecting member provided at the front end of the housing, and a first joint and a second joint respectively hinged with the connecting member, the first joint is connected with the front end component of the magazine, and the first The two joints are connected to the rear end component of the magazine. The surfaces of the first joint and the second joint that are opposite to each other are provided with teeth that mesh with each other. A predetermined distance from the center of rotation of the second joint and the connecting member.

Further, the connecting member includes a supporting base, a supporting block and a pressing block installed together, and the first joint and the second joint are sandwiched between the supporting block and the pressing block; the supporting base and the pressing block A support slot is provided between the support blocks; the push blade is connected to the cutting blade through the support slot.

Further, a portion of the pushing blade passing through the supporting groove is provided with a supporting frame, and the supporting frame is in contact with a groove wall of the supporting groove.

Further, the groove wall of the supporting groove includes two arc-shaped structures facing away from each other; the connecting member further includes a connecting sleeve, and the pressure block, the supporting block and the supporting seat are installed in the connecting sleeve, and The connecting sleeve is installed at the front end of the casing.

Further, the first joint is provided with a first inclined surface on both sides of the tooth, and the second joint is provided with a second inclined surface on both sides of the tooth, and the first inclined surface and the first The two inclined surfaces cooperate to limit the relative rotation angle range of the second joint and the first joint.

Further, the stapler staple cartridge assembly further includes a limiting structure for limiting a back-and-forth movement range of the support frame.

A stapler stapler assembly includes a stapler front end assembly and a stapler rear end assembly connected by a turning actuator, the rear end assembly of the stapler has a pull rod and a push blade; the turning actuator includes a connecting member and A first joint and a second joint respectively hinged with the connecting member, the first joint is adapted to be connected with the front end component of the magazine, the second joint is adapted to be connected with the rear end component of the magazine, the first joint Interlocking teeth are provided on a surface opposite to the second joint; the tie rod is hinged to the connecting member, and the rotation center of the tie rod and the connecting member is radially away from the second joint and the connecting member in a radial direction. The center of rotation is a predetermined distance.

Further, the connecting member includes a supporting base, a supporting block and a pressing block installed together, and the first joint and the second joint are sandwiched between the supporting block and the pressing block; the supporting base and the pressing block A support groove is provided between the support blocks; the push blade passes through the support groove.

Further, the groove wall of the supporting groove includes two arc-shaped structures facing away from each other.

Further, the connecting member further includes a connecting sleeve, and the pressing block, the supporting block and the supporting seat are installed in the connecting sleeve.

Further, the support frame is provided with a hollow structure.

As mentioned above, the beneficial effect of the present invention is that the push blade of the present invention is narrower than the existing structure, for example, it is only half the size of the existing structure and occupies a small space of the housing, so that more space is reserved The insurance structure is convenient for the arrangement of the insurance structure in the housing; and after the width of the push blade is narrowed, the resistance to be overcome during bending is reduced, and a larger angle can be bent under the same operating force. The arrangement structure is distributed up and down, which is convenient to assemble, does not interfere with each other, and has a compact structure.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic structural diagram of a nail box assembly according to an embodiment of the present invention; FIG.

2 and 3 are sectional views of the staple cartridge assembly shown in FIG. 1 from the middle upward and downward, respectively;

4 is an exploded view of a nail box assembly according to an embodiment of the present invention;

FIG. 5 is an exploded view of a turning actuator, a pushing blade and a pull rod according to an embodiment of the present invention; FIG.

6 and 7 are schematic diagrams of the installation of a turning actuator and a push blade according to an embodiment of the present invention;

8 is a schematic diagram of an explosion structure of a fuse structure and a lower shell according to an embodiment of the present invention;

Fig. 9 is a sectional view taken along A-A in Fig. 1;

10 is a sectional view taken along the line B-B in FIG. 1;

FIG. 11 is a schematic structural diagram of the pawl moving forward with the connecting seat and the pushing blade when the first firing is performed;

FIG. 12 is a structural schematic diagram of forward rotation and direction change when the pawl passes through the direction changing structure after the first firing;

FIG. 13 is a schematic diagram of the pawl abutting on the stop structure to prevent the push blade from advancing during the second firing.

Part number description

100-nail box front assembly; 101-cutter;

200-turning actuator; 201-support seat; 202-support block; 203-press block; 204-connecting sleeve; 205-first joint; 206-second joint; 207-support groove; 208-connecting column; 209 -Central axis; 210-Center hole; 211-Evacuation opening; 212-Limit protrusion; 213-Limit step; 214-Tooth; 215-Slope;

300-nail box rear assembly; 301-upper shell; 302-lower shell; 303-push blade; 304-draw rod; 305-connecting base; 306-detent; 307-elastic retaining element; 308-pin shaft; 309- Support frame; 310-bar-shaped hole; 311-avoidance groove; 312-restriction groove; 313-restrictive groove front wall; 314-restrictive groove rear wall; 315-extension; 316-hook; 317-first Chute; 318-second chute; 319-mounting groove; 320-contact piece.

Detailed ways

In the embodiment of the present invention, the front-to-back orientation refers to the use state of the stapler. Specifically, the side of the stapler facing the patient is the front, and the other side facing away from the patient is the rear.

Examples

As shown in FIG. 1 to FIG. 4, the stapler stapler assembly provided by the embodiment of the present invention includes a stapler front end assembly 100 and a stapler rear end assembly 300 connected by a bending actuator 200. The staple cartridge front assembly 100 includes a staple cartridge, an anvil, a cutter 101, and the like. The back end assembly 300 of the magazine includes a casing, a pull rod 304, a push blade 303, a safety structure and the like installed in the casing. The casing includes an upper casing 301 and a lower casing 302, and the rear end of the casing is a connection part connected with the connecting rod of the stapler. One end of the stapler connecting rod is connected to the nail box, and the other end is connected to the power handle. The power handle transmits power to the connecting rod, and the nail box is driven by the connecting rod to complete cutting, sewing and the like. The front end of the pull rod 304 is connected to the turning actuator 200. The push blade 303 is located at the upper part of the inner cavity of the housing, and the front end of the push blade 303 is connected to the cutting blade 101 of the front end assembly 100 of the magazine. Specifically, the push blade 303 can extend from the housing and pass through the bend. The turning actuator 200 (eg, passing through the upper part of the turning actuator 200) is directly connected to the cutting blade 101; or, the pushing blade 303 is basically located in the housing, and the front end of the pushing blade 303 is executed by passing through the turning The middle part of the mechanism 200 is indirectly connected to the cutting blade 101. The push blade 303 and the centering member may be attached together or formed integrally. The insurance structure includes a connecting seat 305 and an actuator, and the actuator is located at a lower portion of the inner cavity of the housing. The rear part of the push blade 303 is connected to the connecting seat 305 and can move forward and backward synchronously. The inner cavity of the housing provides a moving space for the forward and backward movement of the push blade 303 and the safety structure in the housing.

With the above-mentioned arrangement structure, the pushing blade 303 can be, for example, an elongated structure having a rectangular cross section along its length direction, the pushing blade 303 penetrates the casing along its length direction, and the height of the pushing blade 303 contained in the casing is relative to the existing structure It can be lowered, for example, it can be only half the height of the existing structure, thereby occupying a smaller space in the housing, so that more space can be reserved for the insurance structure, which facilitates the arrangement of the insurance structure in the housing. In addition, when the height of the push blade 303 becomes lower, the resistance to be overcome during bending is reduced, and a larger angle can be bent under the same operating force. The arrangement structure is distributed up and down, which is convenient to assemble, does not interfere with each other, and has a compact structure.

As shown in FIG. 5 to FIG. 7, the turning actuator 200 is used for turning the magazine, and includes a first joint 205, a second joint 206, and a connection between the first joint 205 and the second joint 206. Connection. The first joint 205 is connected to the front end assembly 100 of the magazine, the second joint 206 is connected to the back end assembly 300 of the magazine, and the first joint 205 and the second joint 206 are also hinged to the connecting members, respectively. The first joint 205 forms a first center of rotation with the hinge of the connecting member, the second joint 206 forms a second center of rotation with the hinge of the connector, and the first center of rotation is at a distance from the second center of rotation. The first joint 205 and the second joint 206 have oppositely-arranged arc-shaped portions, and teeth 214 are correspondingly provided on opposite surfaces of the arc-shaped portions of the two, and the first joint 205 and the second joint 206 are engaged by the teeth 214. The connecting member is provided with a connecting portion for articulating with the stapler rod 304, and the connecting portion and the rotating connection of the rod 304 form a third rotation center, and the third rotation center and the second rotation center are radially spaced from each other by a certain distance, that is, The second rotation center and the third rotation center are disposed on different axes so as to form a torque for driving the connection member to rotate.

The first joint 205 and the second joint 206 are respectively hinged to the connecting member, and the pull rod 304 is hinged to the connecting member. Since the second joint 206 is fixed to the rear end component 300 of the magazine, when the connecting member is driven by the pulling rod 304, the connecting member is wound around the second The rotation center is rotated relative to the second joint 206, and the first joint 205 is also rotated around the second rotation center along with the connecting member. In addition, the first joint 205 can also rotate relative to the second joint 206 around the first rotation center under the action of the intermeshing teeth 214. The first joint revolves and rotates at the same time, so that the first joint 205 has two turns at the same time. The superposition of the actions, that is, the superposition of the two turning actions of the front end assembly 100 of the magazine with respect to the rear end assembly 300 of the magazine, thereby increasing the rotation angle of the magazine when the front and rear movement strokes of the tie rod 304 are constant. Preferably, the rotation angle range of the nail box is -90 ° to + 90 °, which can meet the surgical requirements of large-angle rotation, and can adapt to the cutting and anastomosis of complex environmental tissues.

Preferably, the connecting portion is a connecting post 208 or a connecting hole provided on the connecting member. Correspondingly, the front end of the pull rod 304 is provided with a hole that cooperates with the connection post 208 or a shaft that cooperates with the connection hole. In this embodiment, the connecting portion is preferably a connecting post 208, and the front end of the pull rod 304 is sleeved on the connecting post 208.

As shown in FIG. 5, as a matter of preference, both the rear part of the first joint 205 and the front part of the second joint 206 have a circular truncated structure or a drum-shaped structure. The teeth 214 are respectively partially provided. The front part of the first joint 205 is a first connection end for fixing with the magazine front-end assembly 100; the rear part of the second joint 206 is a second connection end for fixing with the magazine rear-end assembly 300.

As shown in FIG. 5, in this embodiment, preferably, the first joint 205 and the second joint 206 are respectively provided with central holes 210 in the middle thereof. A preferred structure of a connecting member is also shown in FIG. 5. The connecting member includes a support block 202. The support block 202 is provided with two central shafts 209. The first joint 205 is connected to the corresponding central shaft through its central hole 210. 209 is rotationally connected, and the second joint 206 is rotationally connected to the corresponding central shaft 209 through its central hole 210.

In an embodiment not shown, the first joint 205 and the second joint 206 may be respectively provided with a central axis, and the support block 202 is provided with two central holes; the first joint 205, the second joint 205, The joint 206 is rotatably connected with the support block 202 through a central axis and a central hole, respectively.

Preferably, the first joint 205 and the second joint 206 are provided with a limiting structure for limiting the maximum relative rotation angle range of the two joints. In this embodiment, the limiting structure is a beveled surface 215 provided on both sides of the teeth 214 on the peripheral wall of the circular table or drum structure of the first joint 205 and the second joint 206 (the inclined plane on the first joint 205 is called The first bevel and the bevel on the second joint 206 are referred to as the second bevel). When the first joint 205 rotates forward and backward to the maximum position, the first joint 205 and the second joint 206 abut against each other through the opposite bevel 215 The first joint 205 is restricted from continuing to rotate.

In order to ensure the stability of the fitting during the rotation of the first joint 205 and the second joint 206 and prevent the longitudinal joint from swinging. As shown in FIG. 5, the connecting member further includes a pressing block 203. The pressing block 203 is provided with a connecting hole. The pressing block 203 and the supporting block 202 are fastened through the connecting hole and the central shaft 209 to connect the first joint 205 and the second joint 206. The circular truncated or drum-shaped structure is sandwiched in between.

As shown in FIG. 5, preferably, in order to facilitate the support of the stapler push blade 303, the connecting member further includes a support base 201, which is connected to the support block 202, for example, by a pin and a pin hole (not labeled in the figure). The pressing block 203 is located on one side of the support block 202, and the support base 201 is located on the other side of the support block 202. Preferably, a support frame 309 is configured at the front end of the push blade 303, and a support slot 207 is provided on the support base 201 for the push blade 303 and the support frame 309 to pass through. The push blade 303 and the support frame 309 pass through the support slot 207. Connect with the cutter.

Preferably, the connection post 208 is provided on the support base 201, and the support block 202 is provided with an escape opening 211 corresponding to the connection post 208, so that the rod 304 does not interact with the support during the rotation of the tie rod 304 around the connection post 208. Block 202 generates interference. In another embodiment that is not shown, the connecting post 208 may also be provided on the supporting block 202 or the pressing block 203, and the supporting base 201 may not be provided at this time, that is, the connecting member may not include the supporting base 201.

Further, in order to facilitate the overall assembly of the connecting piece, the turning actuator 200 further includes a connecting sleeve 204 which is sleeved outside the connecting piece, that is, the pressing block 203, the supporting block 202, and the supporting base 201 are installed on the connection. The sleeve 204 is integrated into a whole, and the connecting sleeve 204 is installed at the front end of the casing.

Preferably, the width of the support groove 207 in the front-rear direction gradually expands from the middle to both ends, and the groove walls of the support groove 207 are two arc-shaped structures facing away from each other. A support frame 309 is provided on one side or preferably both sides of the front end of the push blade 303. Preferably, the support frame 309 is provided at a portion of the push blade 303 that passes through the support groove 207. The front and rear ends of the support frame 309 are respectively disposed at the front end assembly 100 and the rear end assembly 300 of the magazine. The support frame 309 and the push blade 303 both pass through the support groove 207. When the front end assembly 100 of the magazine is bent, the middle portion of the support frame 309 abuts against the arc-shaped groove wall of the support groove, so that the support seat 201 of the connecting member supports the support frame 309, and has a double-side The arc-shaped support groove 207 allows the connecting member to rotate relative to the support frame 309 within a certain angular range. When the stapler of this embodiment performs a turning action, the front and rear ends and the middle portion of the support frame 309 are subjected to three forces. Compared with the traditional structure where the blade is not supported in the middle, the support state of the blade 303 can be improved, and the support can be guaranteed. The uniformity of the bending of the rack 309 and the push blade 303 avoids the problem of unsmooth operation caused by excessive local bending. The groove wall of the support groove 207 is a double-arc structure facing away from each other, and can effectively support the middle part of the support frame 309 when it is bent forward and backward, and the arc-shaped structure supports better. It can be understood that the push blade 303 can move back and forth relative to the support frame 309, thereby pushing the cutter to move to achieve cutting. In addition, as shown in FIG. 7, both the support frame 309 and the push blade 303 maintain a substantially abutting positional relationship under the constraints of the support groove 207 and a suitable concave structure located in front of and behind the support groove 207.

Preferably, the two ends of the support frame 309 are movably installed in the magazine front-end assembly 100 and the magazine back-end assembly 300 and can move back and forth relative to the magazine front-end assembly 100 and the magazine back-end assembly 300. By making the support frame 309 move relative to the front end assembly 100 and the back end assembly 300 of the magazine, the bending resistance can be reduced.

Preferably, a limiting structure for limiting the back-and-forth movement range of the support frame 309 is provided between the front end assembly 100 and the rear end assembly 300 of the magazine and the support frame 309. In this embodiment, referring to FIG. 7, the limiting structure includes a limiting step 213 provided on the front end assembly 100 and the rear end assembly 300 of the magazine, and a limiting protrusion 212 provided on the end of the support frame 309. The limiting protrusions 212 at each end of the block 309 are blocked on the limiting step 213 in the corresponding front end assembly of the magazine or the rear end assembly of the magazine, thereby limiting the forward and backward movement range of the support frame 309. In this embodiment, for ease of assembly, the limiting step 213 is disposed at the front of the first joint 205 and the rear of the second joint 206.

Preferably, the two arc-shaped structures formed by the two groove walls of the support groove are symmetrical to each other, and preferably, the arc-shaped structure of the single groove wall is also symmetrical in the front-rear direction. That is, the two groove walls of the support groove 207 form a hyperbolic structure, and the curved arcs of the two groove walls are symmetrical to ensure that the front end component of the magazine is supported by the support frame 309 when it is bent forward and backward relative to the rear component of the magazine. The same force, the same bending uniformity.

As a further preference, a hollow structure is provided on the support frame 309, and the hollow structure can reduce the bending resistance of the support frame 309. In this embodiment, the support frame 309 is a support piece. The support frame 309 is provided with a strip hole 310 along the length direction, and the strip hole 310 penetrates the thickness direction of the support frame 309. The depth from the top surface to the bottom surface of the support groove 207 is greater than or equal to the height of the support frame 309 passing through the support groove 207 and the height of the push blade 303, so that the support frame 309 and the push blade 303 located in the support groove 207 are effectively supported.

As shown in FIGS. 8 to 10, the actuator includes a pawl (also referred to as a stop block) 306 and an elastic retaining element 307. The push blade 303 is disposed inside the lower case 302, and the connection base 305 is connected to the rear of the push blade 303, and can move forward and backward synchronously with the push blade 303. The first end of the pawl 306 is hinged to the connecting base 305, so that the pawl 306 can be mounted on the connecting base 305 so as to be able to rotate forward and backward. A sliding surface (bottom wall of the first sliding groove 317) slidingly matched with the pawl 306 is provided in the housing. The sliding surface is specifically disposed on the lower case. The second end of the pawl 306 is elastic under the action of the elastic retaining element 307. Abut on the sliding surface.

The elastic retaining element 307 is preferably an elastic piece, and the first end of the elastic piece is fixedly connected to the first end of the pawl 306. A first abutting plane and a second abutting plane (both are not labeled in the figure) opposite to each other are disposed in the casing, and the second end of the elastic sheet selectively abuts against the first abutting plane or the second abutting plane.

In the initial state, the push blade 303 is in the retracted initial position, and the end of the pawl 306 is pressed against the lower case 302 and contacts the lower case 302. Under the action of the firing force, the connecting seat 305 and the pawl 306 move along the axial direction (length direction) of the lower shell 302 along with the push blade 303 from the front to the back.

The lower shell 302 is provided with a direction changing structure and a stop structure. In the initial state, the pawl 306 is tilted backwards; in the first firing, the pawl 306 can pass through the stop structure and the direction changing structure without changing the direction; during the completion of a firing, the pusher blade 303 retreats, the pawl The claw 306 rotates forward to tilt forward under the action of the direction changing structure, and abuts against the stop structure during the second firing, preventing the push blade 303 from moving forward.

More specifically, during one firing, the pawl 306 moves forward with the connection seat 305 and the push blade 303 and abuts against the sliding surface. Since the pawl 306 tilts backward and can swing elastically, it can pass the stop structure. During the retreat of the push blade 303 after one firing is completed, the pawl 306 is rotated to incline forward by changing the direction structure, and elastic swing occurs when retreating, and passes through the stop structure. When the secondary firing moves forward, the pawl 306 is still elastically pressed against the sliding surface, but because the pawl 306 is tilted forward and abuts against the stop structure, thereby restricting the push blade 303 to move forward again, that is to prevent Second firing to achieve the insurance function. The safety structure is mainly composed of a connecting seat 305, a pawl 306, and an elastic holding element 307, etc., with fewer parts, a simple structure and convenient assembly. The working principle of the insurance structure is simple. The direction of the pawl 306 is used to achieve the limit of contact with the stop structure, reducing the risk of failure of the mechanism and ensuring the stability of the operation of the mechanism.

A preferred solution is that the pawl 306 and the elastic retaining element 307 are both located in the space between the lower case 302 and the push blade 303, that is, the pawl 306 and the elastic retaining element are located at the lower portion of the inner cavity of the housing. An extension 315 is formed at the rear of the push blade 303, and a mounting groove 319 corresponding to the extension is defined in the connection base 305. The extension 315 extends into the installation groove 319 of the connection base 305 to save space. When the push blade 303 is driven forward, the pushing force of the power handle acts on the connecting base 305, and the pushing force is transmitted through the abutting effect of the mounting wall 319 of the connecting base 305 groove wall and the extension 315, driving the push blade 303 and the pawl 306 forward. , Thereby ensuring the force of the push knife 303. The rear end of the push blade 303 has a hook portion 316. The hook portion 316 is located behind the extension portion 315. The connecting seat 306 is provided with a positioning groove (not labeled in the figure) corresponding to the hook portion 316. The hook portion 316 extends into the positioning groove. To save space. The hook portion 316 is used to connect with the rear actuator. The rear actuator causes the push blade 303 to drive the connection seat 305 and the pawl 306 back by pulling the hook portion 316. Preferably, a portion of the connection seat 305 between the mounting groove 319 and the positioning groove is snapped between the extension portion 315 and the hook portion 316.

A preferred solution is that a limiting structure is formed between the lower case 302 and the push blade 303 to limit the rotation range of the pawl 306, that is, the push blade 303 and the lower case 302 limit the angle range of the pawl 306 to rotate back and forth.

A preferred solution is that a first sliding groove 317 corresponding to the pawl 306 is provided on the lower shell 302 in the axial direction, and a bottom surface of the first sliding groove 317 forms a sliding surface elastically abutting against the pawl 306. The pawl 306 is capable of moving forward and backward along the first chute 317. A second sliding groove 318 corresponding to the connecting seat 305 is provided on the lower shell 302 along the axial direction. The connecting seat 305 is supported in the second sliding groove 318 and can move back and forth along the second sliding groove 318. A sliding slot 317 is lower than the second sliding slot 318. The first chute 317 and the second chute 318 limit and guide the pawl 306 and the connecting seat 305. Preferably, between the second sliding groove 318 on the housing and the connecting seat 305, a rotation-preventing cutting surface for restricting relative rotation between the two is provided (see FIG. 10, which is not labeled in the figure).

The preferred solution is, as shown in FIG. 12, the changing structure is an avoidance groove 311 opened on the lower case 302, and a part of the first sliding groove 317 coincides with the avoiding groove 311, that is, on the bottom wall of the first sliding groove 317. The avoidance groove 311 is provided at an appropriate position. The depth of the avoidance groove 311 should be such that after the pawl 306 slides into the range of the avoidance groove 311, it will not touch the bottom of the avoidance groove 311 even if it rotates in the depth direction of the avoidance groove 311. In the process of retreating after the first firing, the pawl 306 fell into the avoidance groove 311. In the process of continuing the retraction, due to the blocking effect of the rear groove wall of the avoidance groove 311, it flipped forward and passed the pawl 306. The position perpendicular to the lower case 302 causes the pawl 306 to change from a backward tilt to a forward tilt, and is kept pressed against the sliding surface by the elastic retaining element 307.

In one embodiment, the stop structure is located behind the changing structure, and the stop structure is a protrusion (not labeled) provided on the lower case 302, specifically a protrusion provided on the sliding surface. In the first firing, the pawl 306 tilts backwards. When the pawl moves forward, the pawl can pass through the protrusion through elastic swing, and in the second firing, the pawl tilts forward, and it will resist. The projection.

In this example, as a preference, a limiting groove 312 is provided on the bottom wall (ie, the sliding surface) of the first sliding groove 317 behind the direction changing structure, and the front wall 313 of the limiting groove forms the stopping structure (equivalent to Protrusion), the rear wall of the limiting groove 314 forms a stopping point for the pawl 306 to move backward, and is used for limiting the pushing by the abutment of the pawl 306 and the rear wall 314 of the limiting groove when the pawl 306 tilts backward. The distance that the blade 303 moves backward. The avoidance groove 311 is lower than the limit groove 312.

In a further solution, the connecting seat 305 is a columnar structure, and the receiving groove is provided thereon. In some embodiments, the receiving groove may be the same groove as the mounting groove 319 described above, and the pawl 306 is rotatable through the pin 308 It is installed in the installation groove 319 of the connecting base 305, and its end protrudes from the installation groove 319; preferably, the first end of the elastic piece is located in the installation groove 319 to save space.

As described above, the first abutting plane and the second abutting plane opposite to each other are provided in the housing. Before the pawl 306 is turned from the backward tilt to the forward tilt, the first The two ends abut against the first abutting plane (see FIG. 11, the first abutting plane is not labeled); after the pawl is flipped, the second end of the elastic sheet also rotates and contacts the second abutting plane. The abutting plane abuts (see Figure 12, the second abutting plane is not labeled). By setting the first abutting plane and the second abutting plane, the rotation range of the elastic sheet is restricted, so as to ensure that the pawl is reliably elastically pressed against the sliding surface and can swing or rotate within a certain angle range according to the situation. In this embodiment, preferably, the second sliding groove 318 groove wall is formed with a first abutment plane that restricts the rotation range of the pawl 306, and the lower edge of the pushing blade 303 forms a second abutment that restricts the rotation range of the pawl 306 flat. Preferably, the first end of the pawl 306 and the rotation center of the connecting seat 305 are located between the first abutting plane and the second abutting plane. Preferably, the second end of the elastic piece is provided with a contact piece 320. During the rotation of the pawl 306, the contact piece 320 abuts against the lower edge of the push blade 303 or the groove wall of the second slide groove 318 to realize the elastic piece. Reliably deform so that the pawl 306 and the sliding surface remain elastically abutted. Preferably, the contact piece 320 is formed by extending an end of the elastic piece. Of course, in other embodiments, the elastic retaining element 307 may also be a torsion spring or other suitable components.

In order to facilitate the pawl 306 to pass through the stop structure smoothly during the forward motion of the first firing, the end of the pawl 306 has an inclined surface (a wedge-shaped surface) or an arc-shaped surface.

The following describes the movement process of the push blade 303 and the pawl 306 in combination with a plurality of drawings. The direction indicated by the arrow in FIG. 11 to FIG. 12 is the movement direction of the push blade 303. As shown in FIG. 1, the pawl 306 is located in the limiting groove 312 in the initial state; as shown in FIG. 11, during the first firing process, a pushing force is applied to the connecting seat 305 to advance the pushing blade 303, and the pawl 306 is connected with the The seat 305 moves forward and turns over the front wall 313 and the avoidance groove 311 of the limiting groove, and continues to move forward; as shown in FIG. 12, after the first firing is completed, a tension is applied to the hook portion 316 and the pawl 306 With the pushing of the blade 303 and the connecting seat 305 backward, when it moves to the avoidance groove 311, it rotates forward by a certain angle under the action of the elastic piece, and under the blocking effect of the rear groove wall of the avoidance groove 311, the pawl 306 moves further. Rotate forward and rotate through the position perpendicular to the lower case 302 to tilt forward. After crossing the rear wall of the avoidance groove 311, the pawl 306 keeps tilting forward and continues to move backward to the initial position; as shown in FIG. 13, During the second firing, since the pawl 306 has been tilted forward, the pawl 306 is kept pressed against the lower case 302 by the elastic force of the elastic piece. When the pushing force is applied to the connection seat 305, the pawl 306 will abut against the limit groove The front wall 313 cannot pass over the limiting groove 312, which prevents secondary firing and prevents Misoperation.

Anyone familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field to which they belong without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

A stapler staple cartridge assembly includes a staple cartridge front end component and a staple cartridge rear end component connected by a turning actuator, and the staple cartridge rear end component includes a casing and a pull rod, a push blade and a fuse provided in the casing. Structure, the front end of the push blade is connected with the cutter of the front end component of the magazine, and the front end of the pull rod is connected with the turning actuator, characterized in that the inner cavity of the housing provides a space for the forward and backward movement of the push blade and the safety structure, The push blade is located at the upper part of the inner cavity of the housing, the safety structure includes a connection seat and an execution element, the rear part of the push blade is connected to the connection base, and the actuator is located at the lower part of the inner cavity of the housing; the push blade passes through The upper part of the turning actuator is connected with the cutter.
The stapler cartridge assembly according to claim 1, wherein the housing comprises an upper shell and a lower shell, the actuator comprises a stop block and an elastic retaining element, and the stop block is rotatably mounted on the connection On the seat, the elastic retaining element is connected with the stop block, so that the free end of the stop block is pressed against the bottom of the lower shell, and the connection seat and the stop block follow the housing axis along with the push blade under the action of the firing force Directional movement, the lower shell is provided with a direction changing structure and a stop structure. During the retreating of the push blade after one firing, the stop block rotates and redirects under the action of the direction changing structure, and abuts on the second firing The stop structure prevents the push blade from moving forward.
The stapler cartridge assembly according to claim 2, wherein the direction changing structure is an avoidance slot opened on the lower shell, and the stopper block is extended during the first firing and retreating process. Enter the avoidance groove, and rotate forward under the function of the rear groove wall of the avoidance groove, and exceed the position where the stop block is perpendicular to the lower shell.
The stapler stapler assembly according to claim 2, wherein a limiting groove is provided on the lower shell behind the changing structure, and a front wall of the limiting groove forms the stopping structure, and the limiting groove The rear wall of the bit groove forms a stop point where the stop block moves backward.
The stapler cartridge assembly according to claim 2, wherein a first slide groove corresponding to the stop block and a second slide groove corresponding to the connecting seat are axially opened on the lower shell, and The stop block can move back and forth along the first slide groove, and the connecting seat is located in the second slide groove and can move back and forth along the second slide groove. The position of the first slide groove is lower than the second slide groove. The bottom of the second chute groove and the lower edge of the push blade form a limit structure that limits the rotation range of the stop block, and a stopper is provided on the stop block or the elastic retaining element. During the rotation of the stop block, , The stopper abuts on the pushing blade or the bottom of the second chute slot to achieve the limit position.
The stapler cartridge assembly according to claim 1, wherein the rear end of the push blade has a hook portion, and the rear portion of the push blade forms an extension portion inward, and the extension portion extends into the connection seat.
The stapler staple cartridge assembly according to claim 1, wherein the turning actuator comprises a connecting member, and a first joint and a second joint respectively hinged with the connecting member, and the first joint is connected to the front end assembly of the staple box. A second joint is connected to the rear end component of the magazine, the first joint and the second joint have opposite arc portions, teeth are arranged on the arc portions, and the first joint and the second joint are engaged by the teeth, The pull rod is rotatably connected with the connecting member.
The stapler cartridge assembly according to claim 7, wherein the connecting member comprises a connecting sleeve and a supporting seat, a supporting block and a pressing block which are sequentially connected up and down, and the pressing block, the supporting block and the supporting block are mounted on In the connection sleeve, the joint between the first joint and the second joint is located between the support block and the pressing block, and the first joint and the second joint are rotatably connected to the support block, respectively. A support slot, and the push blade passes through the support slot.
The stapler cartridge assembly according to claim 8, wherein the support groove gradually expands from the middle to the two ends, the groove wall of the support groove is an arc-shaped structure facing away, and the push blade is arranged outside There is a support frame, and the two ends of the support frame are respectively arranged on the front end component of the magazine and the rear end component of the magazine. The support frame and the push blade pass through the support slot. When the front end component of the magazine is turned, the support frame The middle part rests on the arc-shaped structure.
The stapler stapler assembly according to claim 9, wherein a strip-shaped hole is provided in the support frame along a length direction, and the strip-shaped hole penetrates the thickness direction of the support frame.
An stapler staple box assembly includes a staple box front end component and a staple box rear end component connected by a turning actuator;

Wherein, the front end component of the magazine includes a cutter;

The rear end component of the magazine includes a housing and a pull rod, a push blade and a safety structure installed in the housing; a front end of the push blade is connected to the cutting blade, and a front end of the pull rod is connected to the turn Actuator connection;

The push blade is connected to the safety structure and is adapted to move back and forth in the housing;

The insurance structure includes: a connecting base, a pawl, and an elastic retaining element; the connecting base is connected to the rear of the push blade, a first end of the pawl is hinged with the connecting base, and a housing is provided in the housing. A sliding surface slidingly matched with the pawl, and a second end of the pawl is elastically abutted against the sliding surface under the action of the elastic retaining element; a protrusion is arranged on the sliding surface, and the sliding An avoidance groove is provided at a position in front of the protrusion. When the push blade moves from the initial position to the front and back, the second end of the pawl passes through the protrusion and the escape groove in sequence and continues. Elastically abuts against the sliding surface; when the push blade moves from front to back, the pawl flips when passing through the avoidance groove to continue to move backward through the protrusion and through the protrusion The second end of the pawl abuts against the protrusion to restrict the forward movement of the push blade again.
The stapler cartridge assembly according to claim 11, wherein the push blade is located at an upper portion of the inner cavity of the housing, and the pawl and the elastic retaining element are located at a lower portion of the inner cavity of the housing.
The stapler stapler assembly according to claim 11, wherein:

The elastic retaining element is an elastic piece, and a first end of the elastic piece is fixedly connected with a first end of the pawl;

A first abutting plane and a second abutting plane opposite to each other are provided in the casing;

Before the pawl is flipped, the second end of the elastic sheet abuts against the first abutting plane; after the pawl is flipped, the second end of the elastic sheet abuts against the second abutting plane by.
The stapler stapler assembly according to claim 13, wherein the rotation center of the first end of the pawl and the connection seat is located between the first abutting plane and the second abutting plane between.
The stapler stapler assembly according to claim 13, wherein the second end of the elastic sheet is provided with a contact sheet.
The stapler cartridge assembly according to claim 11, wherein the connecting seat is provided with a mounting groove, and the push blade is provided with an extension portion that extends into the mounting groove, and the extension portion is adapted to communicate with The groove wall of the mounting groove abuts.
The stapler cartridge assembly according to claim 16, wherein the connecting seat is provided with a positioning groove, and the rear end of the push blade is provided with a hook portion that extends into the positioning groove, and the hook The portion is located behind the extension.
The stapler staple cartridge assembly according to claim 17, wherein a portion of the connection seat between the mounting groove and the positioning groove is snapped between the extension portion and the hook portion.
The stapler staple cartridge assembly according to claim 11, wherein the connecting seat is slidingly fitted to the housing, and a stopper for restricting relative rotation between the connecting seat and the housing is provided between the connecting seat and the housing. Turn the noodles.
The stapler cartridge assembly according to claim 11, wherein the turning actuator comprises a connecting member provided at a front end of the housing, and a first joint and a second joint respectively hinged with the connecting member, and The first joint is connected to the front end component of the nail box, the second joint is connected to the back end component of the nail box, the teeth on the opposite surfaces of the first joint and the second joint are provided with intermeshing teeth; the tie rod is hinged to the connecting member, The center of rotation of the tie rod and the connecting member is a predetermined distance from the center of rotation of the second joint and the connecting member in a radial direction.
The stapler stapler assembly according to claim 20, wherein:

The connecting member includes a supporting base, a supporting block and a pressing block installed together, and the first joint and the second joint are sandwiched between the supporting block and the pressing block; There are support slots;

The push blade is connected to the cutting blade through the support groove.
The stapler cartridge assembly according to claim 21, wherein a portion of the push blade passing through the support groove is provided with a support frame, and the support frame is in contact with a groove wall of the support groove.
The stapler cartridge assembly according to claim 21, wherein the groove wall of the supporting groove comprises two arc-shaped structures facing away from each other; the connecting member further comprises a connecting sleeve, the pressing block, the supporting The block and the support seat are installed in the connection sleeve, and the connection sleeve is installed at the front end of the housing.
The stapler cartridge assembly according to claim 20, wherein the first joint is provided with a first inclined surface on both sides of the tooth, and the second joint is provided on both sides of the tooth respectively There is a second inclined surface, and the first inclined surface and the second inclined surface cooperate to limit a relative rotation angle range of the second joint and the first joint.
The stapler cartridge assembly according to claim 22, further comprising a limiting structure for limiting a back-and-forth movement range of the support frame.
The stapler stapler assembly includes a stapler front-end assembly and a stapler rear-end assembly connected by a turning actuator. The stapler rear-end assembly has a pull rod and a push blade. The feature is that the turning actuator It comprises a connecting piece, and a first joint and a second joint respectively hinged with the connecting piece. The first joint is suitable for connecting with the front end component of the magazine, and the second joint is suitable for connecting with the rear end component of the magazine. The surfaces of the first joint and the second joint that are opposite to each other are provided with teeth that engage with each other; the tie rod is hinged to the connecting member, and the rotation center of the tie rod and the connecting member is radially away from the second joint and The center of rotation of the connecting member is a predetermined distance.
The stapler cartridge assembly of claim 26, wherein:

The connecting member includes a supporting base, a supporting block and a pressing block installed together, and the first joint and the second joint are sandwiched between the supporting block and the pressing block; There are support slots;

The push blade passes through the support groove.
The stapler cartridge assembly according to claim 27, wherein a portion of the push blade passing through the support groove is provided with a support frame, and the support frame is in contact with a groove wall of the support groove.
The stapler cartridge assembly of claim 27, wherein the groove wall of the support groove comprises two arc-shaped structures facing away from each other.
The stapler cartridge assembly according to claim 27, wherein the connecting member further comprises a connecting sleeve, and the pressing block, the supporting block and the supporting seat are installed in the connecting sleeve.
The stapler cartridge assembly of claim 26, wherein the first joint is provided with a first bevel on each side of the tooth, and the second joint is provided on each side of the tooth There is a second inclined surface, and the first inclined surface and the second inclined surface cooperate to limit a relative rotation angle range of the second joint and the first joint.
The stapler stapler assembly according to claim 28, wherein the support frame is provided with a hollow structure.