A linear cutting stapler

Abstract

The present invention relates to the field of medical devices, and in particular to a linear cutting stapler. The parallel closing mechanism enables the staple magazine support and the nail anvil support to be parallel when opening and closing. The switching member is sleeved on the rotation input shaft, can move between the first position and the second position and is driven to rotate with the rotation input shaft. The switching power input member is connected to the switching member, and the first rotating output member is fixed to the switching member. When the switching member is in the first position, the first rotating output member is connected to the staple magazine support in a manner that the rotation of the first rotating output member is converted into the opening and closing of the staple magazine support relative to the nail anvil support, and the switching member is separated from the second rotating output member. When the switching member is in the second position, the first rotating output member is disconnected from the staple magazine support, and the switching member is connected to the second rotating output member in a driving rotation manner, and the second rotating output member is connected to the firing screw in a driving rotation manner. As a result, the stapler can ensure the stability of opening and closing, and can adopt a simple and compact structure.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and in particular relates to a linear cutting stapler. Background Art

[0002] In general surgery, linear cutting staplers are often used to complete tissue cutting and suturing. Specifically, the distal end of the stapler has a stapler and anvil. When the stapler and anvil are separated, the tissue to be cut is placed between the stapler and anvil. The distance between the stapler and anvil is adjusted to squeeze the tissue reasonably. When the distance between the stapler and anvil reaches the safe range for effective cutting and suturing, the stapler is fired.

[0003] In order to avoid the instability and inconvenience of manual closing and firing drive, the current stapler has adopted electric drive to complete the driving of the two movements of closing and firing. In order to reduce the cost of the stapler and reduce the volume of the stapler, the use of a single motor is a better choice. CN106388893B discloses a linear cutting stapler, which includes a first closing axis, a second closing axis, a closing screw, a staple magazine assembly, a cutter propulsion axis, a firing screw, a cutter assembly, a staple pusher and a switching mechanism. During the closing or opening process of the linear cutting stapler, the switching mechanism is used to transfer the power of the power input shaft to the second closing axis. Therefore, the power input shaft drives the first closing axis, the switching mechanism, the second closing axis and the closing screw to rotate in sequence, thereby driving the staple magazine assembly to translate and complete the closing or opening process of the linear cutting stapler. After that, the switching mechanism is adjusted to transmit the power of the power input shaft to the cutter propulsion shaft. At this time, the power input shaft drives the switching mechanism, the cutter propulsion shaft and the firing screw to rotate in turn, thereby driving the cutter assembly and the nail pushing device to translate, and completing the firing process of the linear cutting stapler. However, in order to avoid excessive and concentrated pressure at the position where the closing screw supports the closing nut and to ensure the stability of the closed parallel, the switching structure is completed by setting a switching ring, a switching button, a first switching ring and a second switching ring. This structure is complex, especially the radial area is large, making the stapler thicker.

[0004] Therefore, how to simplify the structure while ensuring closed stability is a technical problem that needs to be solved urgently in this field. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the existing technical problems, the present invention provides a linear cutting stapler which can ensure stable closure and simplify the structure.

[0007] (II) Technical solution

[0008] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0009] The present invention provides a linear cutting stapler, comprising a staple magazine support, a staple anvil support and a firing screw, and also comprising a parallel closing mechanism, a rotation input shaft, a first rotation output member, a second rotation output member, a switching member and a switching power input member; the parallel closing mechanism is connected to the staple magazine support or is connected to the staple magazine support and the staple anvil support at the same time, so that the staple magazine support and the staple anvil support are parallel when they are opened and closed; the switching member is sleeved on the rotation input shaft in a manner that it can move between a first position and a second position and is driven to rotate with the rotation input shaft, the switching power input member is connected to the switching member in a manner that it can rotate relative to the switching member and can drive the switching member to move, the first rotation output member is fixed on the switching member, and the second rotation output member is connected to the firing screw in a manner that is driven to rotate; when the switching member is in the first position: the first rotation output member is connected to the staple magazine support in a manner that the rotation of the first rotation output member is converted into the opening and closing of the staple magazine support relative to the staple anvil support, and the switching member is separated from the second rotation output member; when the switching member is in the second position: the first rotation output member is disconnected from the staple magazine support, and the switching member is connected to the second rotation output member in a manner that is driven to rotate.

[0010] According to the present invention, the switching member is a hollow shaft, which is sleeved outside the second rotation output member when in the second position; the second rotation output member is a rotating shaft, and the switching member and the second rotation output member are both coaxially arranged with the rotation input shaft.

[0011] According to the present invention, the proximal end of the switching member is connected to the distal end of the rotation input shaft in a manner that the switching member can be axially movable and can be driven to rotate.

[0012] According to the present invention, the distal end of the rotation input shaft is rotatably sleeved with the proximal end of the second rotation output member.

[0013] According to the present invention, the switching member is also sleeved on the outside of the second rotation output member when in the first position, and the switching member forms a selectable driving connection with the middle portion of the second rotation output member.

[0014] According to the present invention, an annular groove or an annular protrusion is arranged on the outer wall of the switching member; the switching power input member includes a connected toggle member and a coupling plate, the coupling plate has a groove end matching the shape of the annular groove or the annular protrusion, and the groove end is relatively rotatably plugged into the annular groove or the annular protrusion.

[0015] According to the present invention, it also includes an elastic member; the elastic member is sleeved on the second rotation output member and abuts against the second rotation output member and the switching member; or the elastic member is sleeved on the rotation input shaft and its two ends are respectively connected to the rotation input shaft and the switching member.

[0016] According to the present invention, it also includes a shell; the rotating input shaft, the first rotating output member, the second rotating output member and the switching member are all rotatably located in the shell; the shell is provided with a slideway for the toggle member in the switching power input member to extend out of the shell, the slideway includes a first slideway section and a second slideway section connected end to end, the first slideway section extends along the axial direction of the rotating input shaft, the second slideway section is perpendicular to the first slideway section, the position and length of the first slideway section are constructed so that the sliding of the switching power input member on the first slideway section can drive the switching member to move between the first position and the second position.

[0017] According to the present invention, the slide also includes a third slide section connected to the second slide section, the third slide section extends axially along the rotating input shaft, the second slide section is perpendicular to the third slide section, and the tail of the third slide section is toward the head side of the first slide section, and the position and length of the third slide section are constructed so that when the switching power input member stays at the tail of the third slide section, the switching member remains drivingly connected to the second rotating output member.

[0018] According to the present invention, it also includes a positioning seat; the positioning seat is fixed on the anvil bracket; the positioning seat is in an inverted L shape; a rectangular hole is provided on the short side, and the rectangular hole is plugged into the anvil on the anvil bracket; an axial hole is provided on the long side for the second rotating output member to pass through and there is a gap with the second rotating output member.

[0019] According to the present invention, the parallel closing mechanism includes two groups of link mechanisms, each group of link mechanisms includes a first link and a second link that are hinged to each other; one end of the first link is hinged to the anvil bracket, and the other end of the first link in the two groups of link mechanisms is rotatably and slidably connected to the nail magazine bracket through the same connecting pin; one end of the second link is hinged to the nail magazine bracket, and the other end of the second link in the two groups of link mechanisms is rotatably and slidably connected to the anvil bracket through the same connecting pin; the first link and the second link are equal in length, and the hinge position of the first link and the second link is located at the length center of the two links.

[0020] According to the present invention, it also includes a positioning seat, which is fixed on the anvil bracket; the positioning seat is in an inverted L shape; a rectangular hole is provided on the short side, and the rectangular hole is plugged into the anvil on the anvil bracket; an axial hole is provided on the long side, for the second rotating output member to pass through and there is a gap with the second rotating output member; the anvil bracket has two symmetrical long fixing ears on the left and right and two symmetrical short fixing ears on the left and right, the long fixing ears are provided with long grooves, and the short fixing ears are provided with round holes; the bottom ends of the first connecting rods in the two groups of connecting rod mechanisms are respectively hinged to the round holes of the short fixing ears through a connecting pin; the bottom ends of the second connecting rods in the two groups of connecting rod mechanisms are both hinged to the same connecting pin that passes through the long grooves of the two long fixing ears; the long fixing ears are located on the proximal side of the positioning seat, and the connecting pins in the long fixing ears are located above the second rotating output member; the short fixing ears are located on the distal side of the positioning seat.

[0021] According to the present invention, it also includes a positioning seat, which is fixed on the anvil bracket; the positioning seat is in an inverted L shape; a rectangular hole is provided on the short side, and the rectangular hole is plugged into the anvil on the anvil bracket; an axial hole is provided on the long side, for the second rotating output member to pass through and there is a gap with the second rotating output member; the anvil bracket has two symmetrical long fixing ears on the left and right and two symmetrical short fixing ears on the left and right, the long fixing ears are provided with long grooves, and the short fixing ears are provided with round holes; the bottom ends of the first connecting rods in the two groups of connecting rod mechanisms are respectively hinged to the long grooves of the long fixing ears through a connecting pin; the bottom ends of the second connecting rods in the two groups of connecting rod mechanisms are both hinged to the same connecting pin that passes through the round holes of the two short fixing ears; the short fixing ears are located on the proximal side of the positioning seat, the connecting pins in the short fixing ears are located above the second rotating output member, and the long fixing ears are located on the distal side of the positioning seat.

[0022] According to the present invention, a positioning block is formed at the bottom of the long side, and the positioning block is inserted into the positioning hole on the nail anvil bracket for positioning.

[0023] According to the present invention, the first rotation output member is sleeved on the switching member, and the first rotation output member is coaxial with the switching member.

[0024] According to the present invention, the first rotating output member is a first bevel gear, which is sleeved on the switching member; the linear cutting stapler also includes a second bevel gear, a closing screw and a closing nut. The first bevel gear is meshed with the second bevel gear when the switching member is in the first position, the second bevel gear is fixedly sleeved with the closing screw, the closing nut is screwed on the closing screw, and the nail magazine bracket is sleeved on the closing nut.

[0025] According to the present invention, at least two circumferentially spaced stops are provided on the inner wall at the distal end of the switching member, and at least the two stops are staggered along the diameter. A radially penetrating slide groove is provided on the second rotating output member, and a slider can be supported in the slide groove for radial movement along the second rotating output member, and at least one end of the slider extends out of the slide groove. The stop block and the slider are used to form a driving connection between the switching member and the second rotating output member; when the switching member is in the first position, the stop block is located on the distal side of the slider; when the switching member is in the second position, the stop block corresponds to the slider in the circumferential direction.

[0026] According to the present invention, the proximal end of the slider is tapered, and the inner side surface of the distal end of the stopper is provided with an inclined surface inclined outwardly toward the distal side.

[0027] According to the present invention, a strip hole is provided on the slider, the length direction of the strip hole is along the radial direction of the second rotation output member, and the slider is supported on the second rotation output member through a rod passing through the strip hole.

[0028] (III) Beneficial effects

[0029] The beneficial effects of the present invention are:

[0030] The linear cutting stapler of the present invention utilizes a parallel closing mechanism that is directly connected to the staple magazine support or is directly connected to both the staple magazine support and the staple anvil support to ensure the parallel and stable opening and closing of the staple magazine support and the staple anvil support. In particular, the mechanism for realizing switching does not need to take into account the requirement of closing stability, and is simplified to connect the switching member with the rotating input shaft, and fix the first rotating output member with the switching member at the same time, so that the first rotating output member can selectively transmit power with the movement of the switching member, and the second rotating output member and the switching member form a selective driving connection that can be axially moved, so that the rotation of the rotating input shaft can be selectively provided to the staple magazine support downstream of the first rotating output member and the firing screw downstream of the second rotating output member. Therefore, the linear cutting stapler of the present invention can ensure the stability of opening and closing, and the switching mechanism therein can adopt a simple and compact structure, thereby reducing costs and being suitable for mass production.

[0031] In the present invention, the second rotating output member is set as a rotating shaft and is coaxially arranged with the rotating input shaft. At the same time, the switching member is set as a hollow shaft sleeve arranged on the outside of the rotating input shaft and the second rotating output member, so that the components that play a role in power transmission are arranged along an axis, the structure is simpler, the radial area of ​​the linear cutting stapler is smaller, and it is conducive to the grasping and use of the linear cutting stapler. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is an exploded schematic diagram of a linear cutting stapler provided in a specific embodiment, wherein the handle of the linear cutting stapler is not shown;

[0033] Figure 2 It is an exploded schematic diagram of a power switching device provided in a specific embodiment, wherein the housing is not shown;

[0034] Figure 3 An exploded schematic diagram of a closing drive mechanism provided in a specific embodiment;

[0035] Figure 4 for Figure 1 A schematic partial cross-sectional view of the linear cutting stapler in the embodiment of the present invention when the switching member is located in the first position;

[0036] Figure 5 for Figure 1 A schematic partial cross-sectional view of the linear cutting stapler in the embodiment of the present invention when the switching member is located in the second position;

[0037] Figure 6 for Figure 1 A schematic front view of a linear cutting stapler;

[0038] Figure 7 A schematic structural diagram of a parallel closing mechanism of a linear cutting stapler provided in Example 2;

[0039] Figure 8 A schematic diagram of the structure of a group of guide mechanisms in the parallel closing mechanism of the linear cutting stapler provided in the third embodiment;

[0040] Fig. 9 This is a schematic structural diagram of a group of guide mechanisms in the parallel closing mechanism of the linear cutting stapler provided in Example 4.

[0041] [Description of Reference Numerals]

[0042] 1: Nail magazine assembly; 101: Nail magazine bracket; 102: Nail magazine; 103: Nail anvil bracket; 1031: Long fixing ear; 1032: Short fixing ear; 104: Nail anvil; 105: Firing screw; 106: Firing nut; 107: Connecting rod mechanism; 1071: First connecting rod; 1072: Second connecting rod; 108: Guide mechanism; 1081: U-shaped frame; 1082: Vertical guide rail; 1083: Slider; 109: Guide mechanism; 1091: Slide rail; 1092: Slider; 2: Closing drive mechanism; 201: Second bevel gear; 202: Closing screw; 203: Closing nut; 204: Upper E-shaped retaining spring; 204': Lower E-shaped retaining spring; 205: Top bearing; 206: Bracket; 207: Gasket; 208: Bottom bearing. 3: power transmission mechanism; 301: rotating input shaft; 3011: first shaft section; 3012: second shaft section; 3013: third shaft section; 3014: fourth shaft section; 3015: annular protrusion; 3016: circular blind hole; 302: first rotating output member; 3021: arc tooth; 303: second rotating output member; 3031: shaft section one; 3032: shaft section two; 3033: shaft section three; 3034: shaft section four; 3035: shaft section five; 3036: sliding groove; 3037: axial plug hole; 304: switching member; 3041: arc groove; 3042: stopper; 3043: Annular groove; 305: switching power input member; 3051: toggle member; 3052: engaging piece; 306: housing; 3061: first slide section; 3062: second slide section; 3063: third slide section; 307: first bearing; 308: first bearing seat; 3081: retaining ring; 3082: annular retaining edge; 309: second bearing; 310: second bearing seat; 3101: positioning block; 311: positioning seat: 3111: rectangular hole; 3112: positioning block; 312: fixing pin; 314: fixing pin; 315: slider; 316: round rod; 317: elastic member. DETAILED DESCRIPTION

[0043] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below in conjunction with the accompanying drawings through specific embodiments. Among them, the side closer to the doctor during use is "near", and the side closer to the patient is "far".

[0044] Embodiment 1

[0045] Reference Figures 1 to 6 This embodiment provides a linear cutting stapler, which includes a stapler assembly 1, a closing drive mechanism 2, a parallel closing mechanism and a power transmission mechanism 3.

[0046] The nail magazine assembly 1 includes a nail magazine support 101 with a nail magazine 102, a nail anvil support 103 with a nail anvil 104, a firing screw 105 and a firing nut 106. The specific structure and working principle of the nail magazine assembly 1 are the same as those in the prior art, so the structure that is not related to the movement of the power transmission mechanism 3 of the present invention is not described in detail.

[0047] The power transmission mechanism 3 includes a rotation input shaft 301, a first rotation output member 302, a second rotation output member 303, a switching member 304, a switching power input member 305, a housing 306, two first bearings 307, a second bearing 309, a first bearing seat 308, a second bearing seat 310 and a positioning seat 311. The rotation input shaft 301, the first rotation output member 302, the switching member 304, the first bearing 307 and the first bearing seat 308 are located in the housing 306, and the second bearing seat 310, the second bearing 309 and the positioning seat 311 are located in the nail anvil bracket 103. The proximal part of the second rotation output member 303 is rotatably located in the housing, and the distal part is rotatably located in the nail anvil bracket.

[0048] The overall shape of the housing 306 is a cuboid, which consists of two left and right parts along the proximal and distal directions, and the two parts are fixed by a fixing pin. The first bearing seat 308 is fixed in the housing 306 by a fixing pin 312. The first bearing seat 308 has a rectangular shape, which can make the first bearing seat 308 more stably fixed in the housing 306, especially when there is a mounting plane in the housing that is compatible with the first bearing seat 308, the first bearing seat 308 will not rotate unnecessarily, and the rectangular bearing seat is also easier to fix with the housing 306. Two first bearings 307 are coaxially fixed in the first bearing seat 308, and the rotation input shaft 301 passes through the two first bearings 307 and is formed by the two first bearings 307 to form a bidirectional rotation support for the rotation input shaft 301. The position of the axis of the rotation input shaft 301 is fixed by the two first bearings 307. The axis of the rotation input shaft 301 is perpendicular to the closing direction, parallel to the extension direction of the nail anvil bracket and the nail magazine bracket, and also parallel to the axis direction of the firing screw.

[0049] Specifically, the proximal end of the rotation input shaft 301 is used to connect with a power source such as a motor that can output rotation, so as to introduce the rotation power into the power transmission mechanism 3. Of course, in other embodiments, the rotation input shaft 301 can also be the output shaft of the power source itself.

[0050] The rotating input shaft 301 includes, from near to far, a first shaft section 3011, a second shaft section 3012, a third shaft section 3013 and a fourth shaft section 3014 which are connected in sequence and are coaxial. The diameter of the first shaft section 3011 is smaller than the diameter of the second shaft section 3012. A C-shaped retaining ring 3081 is provided at the connection between the first shaft section 3011 and the second shaft section 3012. The retaining ring 3081 is fixed in an annular groove on the inner wall of the first bearing seat 308. An annular protrusion 3015 is provided at the proximal end of the second shaft section 3012. A first bearing 307 is axially limited between the retaining ring 3081 and the annular protrusion 3015. The diameter of the third shaft segment 3013 is smaller than the diameter of the second shaft segment 3012, that is, an annular end face is formed between the second shaft segment 3012 and the third shaft segment 3013, and an inward annular rib 3082 is provided at the distal end of the first bearing seat 308, and another first bearing 307 is axially limited between the annular rib 3082 and the annular end face. The cross section of the fourth shaft segment 3014 is D-shaped, and the diameter of the circle where the arc edge of the D-shape is located is the same as the diameter of the third shaft segment 3013. A circular blind hole 3016 extending in the axial direction is provided at the distal end of the fourth shaft segment 3014, and the axis of the circular blind hole 3016 coincides with the axis of the rotating input shaft 301.

[0051] The second bearing seat 310 is fixed in the anvil support 103 by a fixing pin 314. The upper portion of the second bearing seat 310 is rectangular in shape to facilitate fixing in the anvil support 103, and then the left and right side walls thereof are smoothly contracted inward and downward in an arc to form a first arc surface, and then bent to form a second arc surface, and finally the second arc surfaces on both sides are connected by a plane, which constitutes the bottom surface of the second bearing seat 310, so that adaptive changes can be made according to the shape of the shaft used for support. At the same time, a positioning block 3101 of a cube or a cuboid formed integrally with the second bearing seat 310 is provided on the bottom surface of the second bearing seat 310, and a positioning hole is provided on the bottom wall of the nail anvil support, and the positioning block 3101 is inserted into the positioning hole, so that the second bearing seat 310 can be fixedly positioned in the nail anvil support. Since the axis of the second bearing seat 310 plays a major role in determining the axis position of the second rotating output member 303 (which will be described in detail later), the precise positioning of the second bearing seat 310 and the first bearing seat 308 can ensure that the rotating input shaft 301 is coaxial with the axis of the second rotating output member 303, thereby ensuring smooth switching. The second bearing 309 is fixed in the second bearing seat 310. Specifically, the second bearing seat 310 has a bearing hole and an axial hole connected in the axial direction, the bearing hole is located on the far side of the axial hole, the diameter of the bearing hole is larger than the diameter of the axial hole, and the second bearing 309 is supported in the bearing hole.

[0052] The second rotation output member 303 is a rotating shaft, which is passed through the axial hole of the second bearing 309 and the axial hole of the second bearing seat 310. The second rotation output member 303 is supported by the axial hole of the second bearing 309 and is rotationally connected to the second bearing 309, but does not contact the axial hole of the second bearing seat 310.

[0053] Specifically, the second rotation output member 303 includes a shaft segment 1 3031, a shaft segment 2 3032, a shaft segment 3 3033, a shaft segment 4 3034 and a shaft segment 5 3035 which are sequentially connected from near to far. The diameter of the shaft segment 1 3031 is smaller than the diameter of the shaft segment 2 3032, the diameter of the shaft segment 2 3032 is smaller than the diameter of the shaft segment 3 3033, the diameter of the shaft segment 3 3033 is smaller than the diameter of the shaft segment 4 3034, and the diameter of the shaft segment 4 3034 is smaller than the diameter of the shaft segment 5 3035. The shaft segment 3 3033 passes through the second bearing 309 and the shaft hole in the above-mentioned bearing hole, that is, the cooperation between the shaft segment 3 3033 and the second bearing 309 plays a major role in supporting the second rotation output member 303. The transition surface between the bearing hole and the shaft hole and the transition surface between the shaft segment 3 3033 and the shaft segment 4 3034 constitute an axial limit for the second bearing 309. The proximal end of the second rotation output member 303 (i.e., the proximal end of the shaft segment 1 3031) is connected to the distal end of the rotation input shaft 301 in a bidirectionally rotatable manner, i.e., the proximal end of the second rotation output member 303 extends into the circular blind hole 3016 of the fourth shaft segment 3014 of the rotation input shaft 301, but there is a gap between the proximal end of the second rotation output member 303 and the inner wall of the circular blind hole 3016, and the two do not form any driving connection. With such an arrangement, the rotation is more stable and the axial structure can be made more compact. A radially penetrating groove 3036 is provided on the shaft segment 3033 of the second rotation output member 303, i.e., the groove 3036 is opened along the diameter direction of the shaft segment 3033 and penetrates the peripheral wall of the shaft segment 3033, and the groove 3036 itself is a rectangular groove, and the groove 3036 is located in the middle of the second rotation output member 303. A slider 315 is supported in the slide groove 3036 so as to be bidirectionally movable along the radial direction of the second rotation output member 303, and at least one end of the slider 315 extends out of the slide groove 3036. In this embodiment, both ends of the slider 315 extend out of the slide groove 3036.

[0054] Specifically, the slider 315 is in the shape of a plate-like member, and a strip hole (preferably a long hole) is provided on the slider 315 that penetrates the slider 315 along the thickness direction of the slider 315, and the length direction of the strip hole is along the radial direction of the second rotation output member 303, and the slider 315 is supported on the shaft section 3033 of the second rotation output member 303 through the round rod 316 passing through the strip hole. In order to facilitate the installation of the slider 315, cavities are provided on both sides of the slide groove 3036 in the shaft section 3033, so that the round rod 316 on the slider 315 can be installed, so that the two ends of the round rod 316 pass through the supporting holes on the side wall of the shaft section 3033. In addition, the proximal end of the slider 315 is gradually reduced, and inclined surfaces are formed on the upper and lower surfaces of the proximal end of the slider 315.

[0055] The shaft section 5 3035 is provided with an axial socket 3037, which is used to connect with the firing screw 105 in a manner that the bidirectional rotation of the second rotation output member 303 is converted into the bidirectional rotation of the firing screw 105. For example, the axial socket 3037 on the shaft section 5 3035 is a D-shaped hole, and the proximal end of the firing screw 105 is configured as a D-shaped end, and the D-shaped end and the D-shaped hole form a connection that can be axially moved and driven for bidirectional rotation. The firing screw 105 is screwed with the firing nut 106, thereby converting the bidirectional rotation of the firing screw 105 into the bidirectional movement of the firing nut 106. Preferably, the axis of the second rotation output member 303 coincides with the axis of the firing screw 105, that is, they are coaxial.

[0056] The switching member 304 is a hollow shaft, which is sleeved on the outside of the rotation input shaft 301 and the second rotation output member 303, and is coaxial with the rotation input shaft 301 and the second rotation output member 303. The first bearing seat 308 is located on the proximal side of the switching member 304, and the second bearing seat 310 is located on the distal side of the switching member 304, that is, the rotation input shaft 301 is located on the proximal side of the second rotation output member 303, the rotation input shaft 301 is at least partially located on the proximal side of the switching member 304, and the second rotation output member 303 is at least partially located on the distal side of the switching member 304. The proximal end of the switching member 304 has a plug hole that matches the shape of the fourth shaft segment 3014 of the rotation input shaft 301, and the fourth shaft segment 3014 is inserted into the plug hole. In this embodiment, because the cross section of the fourth shaft segment 3014 is D-shaped, the plug hole on the switching member 304 is also a D-shaped hole. In this way, a driving connection that can move axially in both directions and drive bidirectional rotation is formed between the proximal end of the switching member 304 and the distal end of the rotating input shaft 301, that is, the switching member 304 can move axially in both directions relative to the rotating input shaft 301, and the bidirectional rotation of the rotating input shaft 301 will drive the switching member 304 to rotate in both directions. In addition, the setting of the insertion hole of the switching member 304 and the length of the fourth shaft segment 3014 can realize that when the switching member 304 moves between the first position and the second position arranged along the axial direction of the rotating input shaft 301, the switching member 304 forms the above-mentioned driving connection with the rotating input shaft 301 when it is in the first position and the second position. In other words, when the switching member 304 is in the first position, the engagement length of the switching member 304 and the fourth shaft segment 3014 is large, and when the switching member 304 is in the second position, the engagement length of the switching member 304 and the fourth shaft segment 3014 is smaller than that of the previous position, but is still in a state of driving connection. In this embodiment, the first position is located proximal to the second position.

[0057] The first rotation output member 302 is sleeved on the proximal end of the switching member, the transmission position of the first rotation output member 302 is located on the proximal side of the disengagement position, and the first rotation output member 302 is coaxial with the switching member.

[0058] In this embodiment, the first rotating output member 302 is a first bevel gear, and the inner hole of the first bevel gear has a plurality of arc teeth 3021 arranged at intervals. The outer wall of the proximal end of the switching member 304 has a plurality of arc grooves 3041 meshing with the plurality of arc teeth 3021, thereby the first rotating output member 302 is drivingly connected to the switching member 304. The arc-shaped tooth grooves can increase the transmission strength and reduce the wear of the tooth grooves. At the same time, the far side of the arc groove 3041 is formed by the outer wall of the switching member 304 itself to form a side groove bottom, and the proximal side of the arc groove 3041 is provided with a retaining ring 3081 sleeved on the switching member 304, and the first rotating output member 302 is limited between the above-mentioned side groove bottom and the above-mentioned retaining ring 3081 along the axial direction of the switching member 304, so that the first rotating output member 302 and the switching member 304 are fixed.

[0059] The first rotating output member 302 and the nail magazine support 101 are connected through the closed driving mechanism 2 to realize the conversion of the rotation of the first rotating output member 302 at the transmission position into the up and down movement of the nail magazine support 101, and the up and down movement of the nail magazine support 101 forms the opening and closing of the nail magazine support 101 and the nail anvil support 103.

[0060] Specifically, the closing drive mechanism 2 includes a bracket 206 , a top bearing 205 , a bottom bearing 208 , a washer 207 , an upper E-shaped retaining spring 204 , a lower E-shaped retaining spring 204 ′, a second bevel gear 201 , a closing screw 202 and a closing nut 203 .

[0061] The bracket 206 is in an inverted U shape, the bottom opening of the bracket 206 is inserted into the first bearing seat 308, and the bottom end of the bracket 206 is fixed to the first bearing seat 308 by a fixing pin. A mounting hole is provided on the upper wall of the first bearing seat 308, the bottom end bearing is fixed in the mounting hole of the first bearing seat 308, and the bottom end of the closing screw 202 is supported on the first bearing seat 308 for bidirectional rotation by the bottom end bearing. The lower side E-shaped retaining spring 204' is fixed on the upper side of the bottom end bearing, and the lower side E-shaped retaining spring 204' is clamped in the clamping groove on the optical axis of the bottom end of the closing screw 202, and the lower side E-shaped retaining spring 204' is located on the outer side of the housing 306. The second bevel gear 201 is sleeved on the closing screw 202, and is axially limited between the threads of the lower side E-shaped retaining spring 204' and the closing screw 202. The top bearing 205 is fixed on the top of the bracket 206, and the top of the closing screw 202 is fixed on the bracket 206 through the top bearing 205. The closing nut 203 is screwed on the closing screw 202, and a retaining ring is provided on the upper part of the closing nut 203, and an annular groove is provided on the lower side of the closing nut 203. A gasket is installed in the annular groove, and the lower side of the gasket is connected to the upper E-shaped retaining ring 204. The proximal end of the nail magazine bracket 101 is provided with a mounting hole that passes through from top to bottom, and the mounting hole is fixed on the closing nut 203 and limited by the retaining ring and the gasket. Therefore, the axis of the second bevel gear 201, the closing screw 202 and the closing nut 203 is perpendicular to the axis of the first rotating output member 302. Of course, in other embodiments, the first rotating output member 302 can also be an ordinary transmission gear, and the corresponding closing drive mechanism 2 is used to transmit power to the nail magazine bracket 101 later. The upper E-shaped retaining spring 204 and the lower E-shaped retaining spring 204 ′ can also be selectively removed and replaced by a pin fixation method or the like.

[0062] When the switching member 304 is in the first position, the first rotation output member 302 meshes with the second bevel gear 201. Through the fixed sleeve connection between the second bevel gear 201 and the closing screw 202, the closing nut 203 screwed on the closing screw 202, and the fixed connection between the closing nut 203 and the nail magazine support 101, the bidirectional rotation of the second bevel gear 201 drives the closing screw 202 to rotate bidirectionally, thereby driving the closing nut 203 to move up and down, thereby driving the nail magazine support 101 to move up and down, forming the opening and closing of the nail magazine support 101 and the nail anvil support 103. It can be understood that in this embodiment, the first rotation output member 302 and the nail magazine support 101 are connected through the closing drive mechanism 2.

[0063] The inner wall of the distal end of the switching member 304 is provided with three circumferentially evenly spaced blocks 3042, so that the three blocks 3042 are staggered along the diameter, that is, any two blocks 3042 are not on the same diameter. The circumferential side surface of each block 3042 can be used to form a push with the circumferential side surface of the slider 315, thereby forming a driving connection between the switching member 304 and the second rotating output member 303, which can be axially relatively moved in both directions and can be driven to rotate in both directions. Corresponding to the tapered design of the slider 315, the inner side surface of the distal end of the block 3042 is provided with an inclined surface inclined outward toward the distal side, and the inclined surface has the same inclination angle as the inclined surface on the slider 315. The purpose of such arrangement is that the switching member 304 stops at a different angle each time after rotating in the first position. For example, if only one stop block 3042 is provided, the stop position of the stop block 3042 may be directly opposite to the slider 315 on the second rotating output member 303. In this way, the stop block 3042 will axially abut against the slider 315 during the movement of the switching member 304 to the second position, thereby preventing the switching member 304 from reaching the second position to form a driving connection with the second rotating output member 303. The multiple blocks 3042 staggered along the diameter of the switching member 304 are combined with the slider 315 to be radially movable in both directions. When the slider 315 is directly opposite to one of the blocks 3042, as the switching member 304 moves axially, the slider 315 will be pushed radially inward by the block 3042 directly opposite to it (the inclined surfaces on the slider 315 and the block 3042 are conducive to this pushing) so as not to hinder the switching member 304 from moving to the second position to form a driving connection with the second output rotating member. The other end of the slider 315 will be more prominent and better correspond to the block 3042 on the other side in the circumferential direction. Since the three blocks 3042 are evenly arranged and the slider 315 has only two ends, there may be a certain distance between the slider 315 and the block 3042 corresponding to it in the circumferential direction. When the switching member 304 rotates again, it will idle for a certain distance. When the block 3042 rotates to push against the slider 315 in the circumferential direction, it will push the second rotating output member 303 to rotate. This idle distance will only cause the discharge time of the firing staples to be slightly earlier or later, and will not affect the suturing effect. Therefore, this design can ensure the smooth switching between the closed state and the firing state.

[0064] In this way, the switching member 304 forms a selective driving connection with the middle part of the second rotating output member 303, so that the rotation of the second rotating output member 303 is more stable. In combination with the proximal end of the second rotating output member 303 and the distal end of the rotating input shaft 301 being rotatably sleeved, the switching member 304 can be made as short as possible while being able to complete the switching work, thereby facilitating the reduction of the axial size of the stapler, and facilitating the overall setting of each shaft to be shorter and more stable in operation.

[0065] The second shaft segment 3032 of the second rotating output member 303 is sleeved with an elastic member 317. The inner wall of the switching member 304 is provided with a blocking wall, and the transition wall between the second shaft segment 3032 and the third shaft segment 3033 of the second rotating output member 303 constitutes the blocking wall, and the elastic member 317 abuts between the two blocking walls. The elastic member 317 is preferably a spring.

[0066] Further, an annular groove 3043 is also provided on the outer wall of the switching member 304, on the far side of the arc groove 3041, that is, on the far side of the connection position between the first rotating output member and the switching member 304. The switching power input member 305 includes a connected toggle member 3051 and an engaging piece 3052, the engaging piece 3052 has a groove end matching the shape of the annular groove 3043, and the groove end and the annular groove 3043 can be plugged in a relatively bidirectional rotation, thereby forming a switching power input member 305 that is rotatable relative to the switching member 304 and can drive the switching member 304 to move bidirectionally between the first position and the second position. The switching power input member 305 in this embodiment provides manual input switching power. The toggle member 3051 is a rod body.

[0067] The shell 306 is provided with a slide for the toggle member 3051 to extend out of the shell 306, and the slide includes a first slide section 3061, a second slide section 3062 and a third slide section 3063 which are connected end to end. The first slide section 3061 and the third slide section 3063 extend along the axial direction of the rotating input shaft, and the second slide section 3062 is perpendicular to the first slide section 3061 and the third slide section 3063. The head of the first slide section 3061 is located on the proximal side, and the tail is located on the distal side; the head of the third slide section 3063 is located on the distal side, and the tail is located on the proximal side, so that the tail of the third slide section 3063 is toward the head side of the first slide section 3061. The position and length of the first slide section 3061 are constructed so that the sliding of the switching power input member 305 between the head and the tail along the first slide section 3061 can drive the switching member 304 to move between the first position and the second position, and the position and length of the third slide section 3063 are constructed so that when the switching power input member 305 stays at the tail of the third slide section 3063, the switching member 304 maintains a driving connection with the second rotating output member 303. At this time, the length of the circumferential resistance between the stop block 3042 of the switching member 304 and the slider 315 of the second rotating output member 303 is less than the length of the circumferential resistance formed by the two when the switching member 304 is in the second position, but it can still ensure that the circumferential resistance that meets the driving connection requirements is achieved.

[0068] The positioning seat 311 is fixed on the anvil support 103 by a fixing pin. The positioning seat 311 is in an inverted L shape as a whole, and a rectangular hole 3111 is provided at the short side, and the rectangular hole 3111 is plugged into the anvil 104; an axial hole is provided on the long side, for the shaft section 4 3034 of the second rotating output member 303 to pass through with a gap, that is, it does not contact the shaft section 4 3034. At the same time, a positioning block 3112 is formed at the bottom of the long side, and the positioning block 3112 is used to be plugged and positioned with the positioning hole on the anvil support 103. Through the setting of the positioning seat 311, the power transmission mechanism 3 and the anvil 104 can be well positioned to ensure the suturing effect.

[0069] In this embodiment, the parallel closing mechanism includes two groups of link mechanisms 107 located on the left and right sides of the nail magazine support 101, and each group of link mechanisms 107 includes a first link 1071 and a second link 1072 that are hinged. The first link 1071 and the second link 1072 are equal in length, and the hinge position of the first link 1071 and the second link 1072 is located at the length center of the two links, thereby dividing the two links into two downward isosceles triangles.

[0070] The nail magazine support 101 is provided with a long slot and a round hole that pass through the left and right sides. The nail anvil support 103 has two symmetrical long fixing ears 1031 on the left and right sides and two symmetrical short fixing ears 1032 on the left and right sides. The long fixing ears 1031 are provided with a long slot, and the short fixing ears 1032 are provided with a round hole. The top ends of the first connecting rods 1071 in the two sets of connecting rod mechanisms 107 are hinged to the same connecting pin that passes through the long slot on the nail magazine support 101, and the bottom ends of the first connecting rods 1071 in the two sets of connecting rod mechanisms 107 are respectively hinged to the round holes of the short fixing ears 1032 through a connecting pin. The top ends of the second connecting rods 1072 in the two sets of connecting rod mechanisms 107 are hinged to the same connecting pin that passes through the round hole on the nail magazine support 101, and the bottom ends of the second connecting rods 1072 in the two sets of connecting rod mechanisms 107 are hinged to the same connecting pin that passes through the long slots of the two long fixing ears 1031. Through the above structure, the top end of the first connecting rod 1071 can rotate and slide along the nail magazine bracket 101, and the bottom end of the second connecting rod 1072 can rotate and slide along the nail anvil bracket 103. In this way, the nail magazine bracket 101 can be prevented from tilting or horizontally staggered relative to the nail anvil bracket 103 during the up and down movement, that is, the nail magazine bracket 101 and the nail anvil bracket 103 are ensured to be parallel when opening and closing, and at the same time, the pressure at the connection between the nail magazine bracket 101 and the closing nut 203 is relieved, so that the setting of the power transmission mechanism 3 can be made into a more optimized and simplified design without considering the pressure here.

[0071] Furthermore, the long fixing ear 1031 is located at the proximal side of the positioning seat 311, and is arranged axially corresponding to the position of the second bearing seat 310 and the slider 315, and the connecting pin in the long fixing ear 1031 is located above the second bearing seat 310, that is, above the second rotation output member 303. The short fixing ear 1032 is located at the distal side of the positioning seat 311, and the connecting pin in the short fixing ear 1032 is located laterally above the anvil 104 on the anvil support 103. Such an arrangement makes the axial structure of the stapler compact and reduces the volume of the stapler.

[0072] Of course, in other embodiments, the positions of the long fixing ear 1031 and the short fixing ear 1032 can also be interchanged, that is, the bottom ends of the first connecting rods 1071 in the two sets of connecting rod mechanisms 107 are respectively hinged to the long grooves of the long fixing ears 1031 through a connecting pin, and the bottom ends of the second connecting rods 1072 in the two sets of connecting rod mechanisms 107 are hinged to the same connecting pin passing through the circular holes of the two short fixing ears 1032, the short fixing ears 1032 are located on the proximal side of the positioning seat 311, the connecting pin in the short fixing ears 1032 is located above the second rotating output member 303, and the long fixing ears 1031 are located on the distal side of the positioning seat 311.

[0073] Among them, the "long" and "short" in the above-mentioned long fixing ears and short fixing ears are a set of relative concepts, which only indicate the length relationship between the two and there is no specific size limitation.

[0074] In summary, the stapler in this embodiment can perform the following actions:

[0075] first step:

[0076] When the toggle member 3051 abuts against the proximal end surface of the first slideway section 3061, the switching member 304 is located at the first position. At this time, the first rotation output member 302 is located at a transmission position capable of driving and connecting with its downstream power transmission member (in this embodiment, the second bevel gear 201 in the closing drive mechanism 2), and the switching member 304 is separated from the second rotation output member 303 (that is, at this time, the stopper of the switching member 304 is located on the proximal side of the slider 315 on the second rotation output member 303 and does not form a connection). The motor is started, and the rotation of the rotation input shaft 301 is converted into the rotation of the switching member 304. The rotation of the switching member 304 drives the first rotation output member 302 to rotate, while the second rotation output member 303 does not rotate. The rotation of the first rotation output member 302 drives the closing screw 202 to rotate through the second bevel gear 201, and the rotation of the closing screw 202 drives the closing nut 203 to move downward, and the distance from the nail magazine support 101 to the nail anvil support 103 meets the closing requirement. During the closing process, the two sets of connecting rod mechanisms are closed synchronously.

[0077] Step 2:

[0078] The motor stops running, and the operator drives the toggle member 3051 to move from the proximal end of the first slide section 3061 toward the distal end of the first slide section 3061, driving the switching member 304 to move toward the second position. The first rotating output member 302 also moves with the switching member 304 and gradually disengages from its downstream power transmission member (i.e., the first rotating output member 302 is disconnected from the nail magazine bracket 101), and the elastic member 317 is compressed.

[0079] When the toggle member 3051 abuts against the distal end surface of the first slideway section 3061, the switching member 304 is located at the second position. Since the elastic member 317 is in the power storage state, the operator cannot release the toggle member 3051, and needs to continuously apply a thrust to the toggle member 3051 to maintain the position. At this time, the first rotation output member 302 is located at a disengaged position from its downstream power transmission member (another second bevel gear 201 in this embodiment), and the stopper 3042 of the switching member 304 corresponds to the slider 315 on the second rotation output member 303 in the circumferential direction, so that the switching member 304 and the second rotation output member 303 form a driving connection.

[0080] When the toggle member 3051 abuts against the distal end surface of the first slideway section 3061, the operator will feel in place, and then the operator drives the toggle member 3051 to rotate to the second slideway section 3062, and the switching member 304 remains in the second position. The operator continues to drive the toggle member 3051 into the third slideway section 3063 and dials the toggle member back until it presses against the proximal end surface of the third slideway section 3063. During this process, the switching member 304 follows the dialing back of the toggle member 3051 and moves a short distance from the second position to the proximal side, but the block 3042 and the slider 315 only move a short distance axially relative to each other, and the two are still in a circumferential corresponding state and maintain a driving connection. At this time, the switching member 304 remains in a driving connection with the second rotation output member 303, the elastic member 317 remains in a compressed state, the toggle member 3051 is locked, and the operator can let go. Therefore, by providing the third slide section 3063 , a function of locking the switching member 304 is provided, so that the operator does not need to continuously act on the switching power input member 305 .

[0081] Among them, the circumferential correspondence formed by the stop block 3042 and the slider 315 can be that the stop block 3042 is in circumferential contact with the slider 315 when the switching member 304 is in the second position, or that the stop block 3042 and the slider 315 are circumferentially spaced a certain distance apart when the switching member 304 is in the second position, but when the switching member 304 starts to rotate a certain angle, it will contact with the slider 315 and then push the slider 315 to rotate. This situation is also a driving connection.

[0082] Step 3:

[0083] Start the motor, and the rotation of the input shaft 301 is converted into the rotation of the switching member 304. The switching member 304 drives the second rotating output member 303 to rotate. The second rotating output member 303 drives the firing screw 105 to rotate, thereby driving the firing nut 106 to move axially for firing.

[0084] Step 4:

[0085] When the firing is required to be released, the driving motor rotates in the reverse direction (opposite to the direction in the third step), the rotating input shaft 301 rotates in the reverse direction (opposite to the direction in the third step), the switching member 304 rotates in the reverse direction (opposite to the direction in the third step), the second rotating output member 303 rotates in the reverse direction (opposite to the direction in the third step), the firing screw 105 rotates in the reverse direction (opposite to the direction in the third step), and the firing nut 106 moves proximally to return to its original position.

[0086] Step 5:

[0087] The motor is stopped, and the operator drives the toggle member 3051 from the third slide section 3063 through the second slide section 3062 into the first slide section 3061, and then the operator can let go, and the stored force of the elastic member 317 pushes the switching member 304 to move toward the first position until the toggle member 3051 reaches the proximal end surface of the first slide section 3061, and the switching member 304 returns to the first position. After that, the driving motor rotates in the opposite direction (opposite to the direction in the first step), the rotation input shaft 301 rotates in the opposite direction (opposite to the direction in the first step), the switching member 304 rotates in the opposite direction (opposite to the direction in the first step), the first rotation output member 302 rotates in the opposite direction (opposite to the direction in the first step), the second bevel gear 201 in the closing drive mechanism 2 rotates in the opposite direction (opposite to the direction in the first step), the closing screw 202 in the closing drive mechanism 2 rotates in the opposite direction (opposite to the direction in the first step), the closing nut 203 in the closing drive mechanism 2 moves upward, and the nail magazine support 101 moves upward and returns to the open state. During the opening process, the two sets of connecting rod mechanisms open synchronously.

[0088] In summary, the linear cutting stapler of the present embodiment utilizes a parallel closing mechanism directly connected to the staple magazine support 101 and the staple anvil support 103 to ensure the parallel and stable opening and closing of the staple magazine support 101 and the staple anvil support 103. In particular, the mechanism for realizing the switching does not need to take into account the requirement of closing stability, and is simplified to connect the switching member with the rotation input shaft, and fix the first rotation output member 302 with the switching member 304, so that the first rotation output member 302 can selectively transmit power with the movement of the switching member 304, and the second rotation output member 303 and the switching member 304 form a selective driving connection that can be axially movable, so that the rotation of the rotation input shaft 301 can be selectively provided to the staple magazine support downstream of the first rotation output member 302 and the firing screw downstream of the second rotation output member 303. Therefore, the linear cutting stapler of the present invention can ensure the stability of opening and closing, and the switching mechanism therein can adopt a simple and compact structure, thereby reducing costs and being suitable for mass production.

[0089] Furthermore, the second rotating output member 303 is configured as a rotating shaft and is coaxially arranged with the rotating input shaft 301, and the switching member 304 is configured as a hollow shaft sleeve arranged on the outside of the rotating input shaft 301 and the second rotating output member 303, so that the components that play a role in power transmission are arranged along an axis, the structure is simpler, the radial area of ​​the linear cutting stapler is smaller, and it is conducive to the grasping and use of the linear cutting stapler.

[0090] Furthermore, the second rotary output member 303 is directly connected to the firing screw coaxially, which also makes the radial area of ​​the linear cutting stapler smaller and makes the axial structure more compact.

[0091] Therefore, the linear cutting stapler of this embodiment comprehensively considers the stability of parallel closure and the structural simplification of the power transmission mechanism 3, and has the advantages of good suturing quality, convenient operation and simple product structure.

[0092] Embodiment 2

[0093] Reference Figure 7 Compared with the first embodiment, the main difference lies in the parallel closing mechanism. In this embodiment, the parallel closing mechanism includes a cantilever, one end of the cantilever is connected to the closing nut 203, and the center of the nail magazine bracket 101 is hinged to the center of the cantilever. The nail magazine bracket 101 is fixed to the cantilever by a pin and can rotate around the pin. The center of the nail magazine bracket 101 coincides with the pin. When the forces on both sides of the nail magazine bracket 101 are uneven during closing, the nail magazine bracket 101 will be pushed to rotate until the forces on the nail magazine bracket 101 are balanced.

[0094] Embodiment 3

[0095] Reference Figure 8, compared with the first embodiment, the main difference lies in the parallel closing mechanism. In this embodiment, the parallel closing mechanism includes two groups of left and right guide mechanisms 108, each group of guide mechanisms 108 includes a U-shaped frame 1081 and a vertical guide rail 1082, the vertical guide rail 1082 is oriented along the up and down direction (i.e., the opening and closing direction), and the bottom end of the vertical guide rail 1082 is fixedly connected to the anvil bracket 103 (for example, bolted), forming a connection position. A slider 1083 is provided at the bottom end of the U-shaped frame 1081, and the slider 1083 can be slidably inserted in the vertical guide rail 1082, and the top of the U-shaped frame 1081 is fixed to the nail magazine bracket 101 (for example, bolted), forming two connection positions. In this way, the nail magazine bracket 101 can be prevented from tilting or horizontally staggered relative to the nail anvil bracket 103 during the up and down movement.

[0096] Embodiment 4

[0097] Reference Fig. 9 , compared with the first embodiment, the main difference lies in the parallel closing mechanism. In this embodiment, the parallel closing mechanism includes two sets of left and right guide mechanisms, each set of guide mechanisms includes at least one slide rail and slider assembly 109, the slide rail 1091 is fixed on the nail anvil support 103, and the slider 1092 is fixed on the nail magazine support 101. If multiple slide rail and slider assemblies 109 are provided, the multiple slide rail and slider assemblies 109 are arranged in the axial direction. In this way, the nail magazine support 101 can also be prevented from tilting or horizontally staggered relative to the nail anvil support 103 during the up and down movement.

[0098] Embodiment 5

[0099] Compared with the first embodiment, the main difference lies in the parallel closing mechanism. In this embodiment, the parallel closing mechanism includes two sets of left and right guide mechanisms, each set of guide mechanisms includes at least one gear rack assembly, the rack is fixed on the nail anvil support 103, and the gear is fixed on the nail magazine support 101. If multiple gear rack assemblies are provided, the multiple gear rack assemblies are arranged in the axial direction. In this way, the nail magazine support 101 can also be prevented from tilting or horizontally staggered relative to the nail anvil support 103 during the up and down movement.

[0100] In summary, the parallel closing mechanism includes all structures that can promote the parallel closing of the nail magazine support 101 and the nail anvil support 103. Among them, as in Example 1, Example 3, Example 4, and Example 5, the parallel closing mechanism is preferably connected to the nail magazine support 101 and the nail anvil support 103 at the same time, so that the parallel closing mechanism and the closing drive mechanism 2 are completely independent, which is more conducive to the long-term effectiveness of parallel closing. Among them, the parallel closing mechanism and the nail magazine support 101 and the nail anvil support 103 form multiple connection positions spaced along the axial direction, which is more conducive to the long-term effectiveness of parallel closing.

[0101] Of course, the above are only several embodiments of the present invention, and the present invention is not limited to the above embodiments. For example, the following structures may be selectively but not limited to be changed:

[0102] In other embodiments, the cross section of the fourth shaft section 3014 of the rotating input shaft 301 is not limited to the D-shape. Generally speaking, a non-circular shape can achieve the function of axial movement and circumferential rotation drive. In addition to the D-shape, a rectangular or gear shape is preferably used. Correspondingly, the D-shaped hole on the switching member 304 can also be changed into other embodiments of the non-circular hole. Whether it is a D-shaped hole or a hole in other forms, there is a disadvantage that it is difficult to align during plugging. Therefore, the following optimization is performed: the fourth shaft section 3014 of the rotating input shaft 301 is a D-shaped shaft, and a plug block protruding radially outward is provided on the outer wall of the distal end of the D-shaped shaft. The axial plug hole 3037 at the proximal end of the switching member 304 is a circular hole, and a slot is provided on the inner wall. An arc guide groove is provided on the proximal surface of the switching member 304 and on both sides of a slot. The two arc guide grooves extend in the direction toward the slot and are finally connected to the slot. Therefore, when the switching member 304 and the rotating input shaft 301 are plugged, the plug block slides to the slot along the arc guide groove to achieve blind plugging. In addition, the axial socket 3037 can be designed on the fourth shaft segment 3014 , and the proximal end of the switching member 304 forms an insertion shaft to connect with the axial socket 3037 on the rotation input shaft 301 .

[0103] In other embodiments, the D-shaped axial insertion hole 3037 of the shaft section 5 3035 of the second rotation output member 303 and the D-shaped end of the firing screw 105 may also be changed to other non-circular shapes, preferably rectangular or gear-shaped. At the same time, the axial insertion hole 3037 may also be set at the proximal end of the firing screw 105, and the shaft section 5 3035 forms an insertion shaft that is plugged into the axial insertion hole 3037 of the firing screw 105. In addition, the above-mentioned arc guide groove can also be used to achieve blind insertion. For example, the proximal end of the firing screw 105 is constructed as a circular shaft, the axial plug hole 3037 of the shaft segment 5 3035 is a D-shaped hole, and the inner wall of the D-shaped hole is provided with a slot. An arc guide groove is provided on the distal surface of the shaft segment 5 3035 and on both sides of a corresponding slot. The two arc guide grooves extend in the direction toward the slot and are finally connected to the slot. Therefore, when the second rotation output member 303 and the firing screw 105 are aligned, the plug slides along the arc guide groove to the slot to achieve blind insertion. In addition, the firing screw 105 can be provided with an axial plug hole and the second rotation output member 303 is provided with an insertion end that cooperates with the axial plug hole.

[0104] In other embodiments, the connection between the rotation input shaft 301 and the switching member 304 and the connection between the second rotation output member 303 and the firing screw 105 may also be connected by a key.

[0105] In other embodiments, the arc teeth 3021 of the first rotation output member 302 and the arc grooves 3041 of the switching member 304 may be changed to cone teeth and cone grooves, etc. Alternatively, the first rotation output member 302 and the switching member 304 may be fixed together by fixing pins, bolts, etc.

[0106] In other embodiments, the number of blocks 3042 is not limited to three, and may also be set to two. However, when two are set, the idling stroke of the switching member 304 will be larger. Considering various parameters such as the idling stroke and product size, three blocks 3042 are a better choice.

[0107] The matching arrangement of the slider 315 and the stopper 3042 in the above embodiment is to ensure that the switching member 304 can be smoothly plugged into the second rotating output member 303 no matter at which angle the switching member 304 stops rotating. However, the structure for achieving this purpose is not limited thereto. For example, in other embodiments, a plurality of stoppers 3042 are provided, and at the same time, the same number of snaps as the stoppers 3042 are provided on the second rotating output member 303 along the circumferential direction, and the snaps can move in the radial direction. The angle difference between the stoppers 3042 is different from the angle difference between the snaps, so as to ensure that at least one pair of snaps and the stoppers 3042 can form a circumferential correspondence. In addition, both the snaps and the slider 315 can be provided on the switching member 304 instead, and the stopper 3042 can be provided on the second rotating output member 303.

[0108] In other embodiments, the settings of the stopper and the slider can be interchangeable. Accordingly, the rotation input shaft and the second rotation output member can be axially separated, the proximal end of the second rotation output member is set to be sleeve-shaped, and the inner wall is configured with a stopper. A sliding groove is set at the distal end of the switching member to fix the slider. The switching member can also be designed as a shaft as a whole, and the distal end of the rotation input shaft is set to be sleeve-shaped. However, this structure will cause the rotation input shaft and the second rotation output member to form a stepped structure, which is more complicated than the above-mentioned embodiment, and the stability is not as good as the above-mentioned embodiment.

[0109] In other embodiments, the stopper may be changed into an arched groove on the inner wall of the switching member, the slider may be changed into an arched snap buckle on the second rotating output member, or the stopper and the slider may be changed into other concave-convex matching structures. However, such structures are not as good as the transmission effect of the structure of the above embodiment.

[0110] In other embodiments, the elastic member 317 can be removed, and when the switching power input member 305 is located at the tail of the first slide section 3061 and needs to return to the head of the first slide section 3061, that is, when the switching member 304 is located at the second position and needs to return to the first position, the operator manually toggles the switching power input member 305. When there is no elastic member 317, although the operator can let go when the switching power input member 305 is pushed to the distal end surface of the first slide section 3061, the structural arrangement of the first slide section 3061, the second slide section 3062 and the third slide section 3063 can still play a role in locking the switching power input member 305, preventing the switching power input member 305 from shifting due to vibration during operation.

[0111] Of course, the elastic member 317 can also be set to be sleeved on the rotation input shaft 301, and the two ends of the elastic member are respectively connected to the rotation input shaft 301 and the switching member 304. When the switching member 304 moves from the first position to the second position, the elastic member 317 is stretched and stored.

[0112] Of course, regardless of the presence or absence of the elastic member 317, in other embodiments, only the first slide section 3061 or the first slide section 3061 and the second slide section 3062 may be retained, and the latter may also play a certain locking role.

[0113] In the above specific embodiment, the elastic member 317 is completely fixed inside the switching member, the switching member is relatively long, and the switching member is located outside the second rotating output member in both the first position and the second position. However, in other embodiments, the switching member may also be moved outside the second rotating output member only in the second position.

[0114] The above embodiment adopts manual switching, and electric switching can also be adopted. For example, a nut is connected to the switching power input member 305, and another motor is connected to a screw rod, and the nut is screwed on the screw rod. Therefore, when the switching member 304 needs to be driven, the button corresponding to the motor is pressed to control the rotation of the motor, thereby controlling the movement of the switching power input member 305.

[0115] In other embodiments, the annular groove 3043 on the switching member 304 may also be changed into an annular protrusion, and the engaging member forms a groove end (having an arc groove) matching the annular protrusion to engage therewith.

[0116] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The content of this specification should not be understood as limiting the present invention.

Claims

1. A linear cutting stapler, comprising a staple cartridge support (101), a staple anvil support (103) and a firing screw (105), characterized in that: It also includes a parallel closing mechanism, a rotation input shaft (301), a first rotation output member (302), a second rotation output member (303), a switching member (304) and a switching power input member (305); The parallel closing mechanism is connected to the nail magazine support (101) or is connected to both the nail magazine support (101) and the nail anvil support (103) so as to enable the nail magazine support (101) and the nail anvil support (103) to be parallel when opening and closing; The switching member (304) is mounted on the rotating input shaft (301) in a manner that it can move between a first position and a second position and is driven to rotate with the rotating input shaft (301); the switching power input member (305) is connected to the switching member (304) in a manner that it can rotate relative to the switching member (304) and can drive the switching member (304) to move; the first rotating output member (302) is fixed to the switching member (304); and the second rotating output member (303) is connected to the firing screw (105) in a manner that it can drive rotation; When the switching member (304) is located at the first position: The first rotation output member (302) is connected to the nail magazine support (101) in such a way that the rotation of the first rotation output member (302) is converted into the opening and closing of the nail magazine support (101) relative to the nail anvil support (103), and the switching member (304) is separated from the second rotation output member (303); When the switching member (304) is located at the second position: The first rotation output member (302) is disconnected from the nail magazine support (101), and the switching member (304) is connected to the second rotation output member (303) in a driving rotation manner; The switching member (304) is a hollow shaft, and the switching member (304) is sleeved outside the second rotation output member (303) when in the second position; The second rotation output member (303) is a rotating shaft, and the switching member (304) and the second rotation output member (303) are both coaxially arranged with the rotation input shaft (301); The first rotation output member (302) is a bevel gear, and the inner hole of the bevel gear has a plurality of arc teeth (3021) arranged at intervals; The outer wall of the front end of the switching member (304) has a plurality of circular arc grooves (3041) meshing with the plurality of circular arc teeth (3021).

2. The linear cutting stapler according to claim 1, characterized in that: The proximal end of the switching member (304) is connected to the distal end of the rotation input shaft (301) in a manner that allows axial movement and can be driven to rotate.

3. The linear cutting stapler according to claim 1, characterized in that: The distal end of the rotation input shaft (301) is rotatably sleeved with the proximal end of the second rotation output member (303).

4. The linear cutting stapler according to claim 1, characterized in that: The switching member (304) is also sleeved on the outside of the second rotation output member (303) when in the first position, and the switching member (304) forms a selectable driving connection with the middle part of the second rotation output member (303).

5. The linear cutting stapler according to claim 1, characterized in that: An annular groove (3043) or an annular protrusion is provided on the outer wall of the switching member (304); The switching power input member (305) comprises a toggle member (3051) and an engaging piece (3052) connected to each other, wherein the engaging piece (3052) has a groove end matching the shape of the annular groove (3043) or the annular protrusion, and the groove end is plug-inly connected to the annular groove (3043) or the annular protrusion so as to be relatively rotatable.

6. The linear cutting stapler according to claim 1, characterized in that: Also included is an elastic member; The elastic member is sleeved on the second rotation output member (303) and abuts against the second rotation output member (303) and the switching member (304); or The elastic member is sleeved on the rotation input shaft (301) and has two ends respectively connected to the rotation input shaft (301) and the switching member (304).

7. The linear cutting stapler according to claim 1, characterized in that: Also includes a housing (306); The rotation input shaft (301), the first rotation output member (302), the second rotation output member (303) and the switching member (304) are all rotatably located in the housing (306); The housing (306) is provided with a slideway for the toggle member (3051) in the switching power input member (305) to extend out of the housing (306), the slideway comprising a first slideway section (3061) and a second slideway section (3062) connected end to end, the first slideway section (3061) extending along the axial direction of the rotating input shaft, the second slideway section (3062) being perpendicular to the first slideway section (3061), the position and length of the first slideway section (3061) being configured such that the switching power input member (305) can drive the switching member (304) to move between the first position and the second position by sliding on the first slideway section (3061).

8. The linear cutting stapler according to claim 7, characterized in that: The slide also includes a third slide section (3063) connected to the second slide section (3062), the third slide section (3063) extending along the axial direction of the rotating input shaft, the second slide section (3062) is perpendicular to the third slide section (3063), and the tail of the third slide section (3063) faces the head side of the first slide section (3061), and the position and length of the third slide section (3063) are constructed so that when the switching power input member (305) stays at the tail of the third slide section (3063), the switching member (304) remains drivingly connected to the second rotating output member (303).

9. The linear cutting stapler according to claim 1, characterized in that: Also includes a positioning seat (311); The positioning seat (311) is fixed on the nail anvil support; The positioning seat (311) is in an inverted L shape; A rectangular hole is provided at the short side, and the rectangular hole is plugged into the anvil on the anvil support (103); An axial hole is provided on the long side for the second rotation output member (303) to pass through and there is a gap between the second rotation output member (303).

10. The linear cutting stapler according to claim 1, characterized in that: The parallel closing mechanism comprises two groups of link mechanisms (107), each group of link mechanisms (107) comprising a first link (1071) and a second link (1072) which are hinged to each other; One end of the first connecting rod (1071) is hinged to the nail anvil support (103), and the other end of the first connecting rod (1071) in the two sets of connecting rod mechanisms (107) is rotatably and slidably connected to the nail magazine support (101) via the same connecting pin; One end of the second connecting rod (1072) is hinged to the nail magazine support (101), and the other end of the second connecting rod (1072) in the two sets of connecting rod mechanisms (107) is rotatably and slidably connected to the nail anvil support (103) via the same connecting pin; The first connecting rod (1071) and the second connecting rod (1072) are of equal length, and the hinge position of the first connecting rod (1071) and the second connecting rod (1072) is located at the length center of the two connecting rods.

11. The linear cutting stapler according to claim 10, characterized in that: It also includes a positioning seat (311), wherein the positioning seat (311) is fixed on the nail anvil support; The positioning seat (311) is in an inverted L shape; A rectangular hole is provided at the short side, and the rectangular hole is plugged into the anvil on the anvil support (103); An axial hole is provided on the long side for the second rotation output member (303) to pass through and there is a gap between the second rotation output member (303); The nail anvil support (103) has two symmetrical long fixing ears (1031) on the left and right and two symmetrical short fixing ears (1032) on the left and right, wherein the long fixing ears (1031) are provided with long grooves, and the short fixing ears (1032) are provided with round holes; The bottom ends of the first connecting rods (1071) in the two sets of connecting rod mechanisms (107) are respectively hinged to the circular holes of the short fixing ears (1032) via a connecting pin; The bottom ends of the second connecting rods (1072) in the two sets of connecting rod mechanisms (107) are both hinged to the same connecting pin passing through the long slot of the two long fixing ears (1031); The long fixing ear (1031) is located on the proximal side of the positioning seat (311), and the connecting pin in the long fixing ear (1031) is located above the second rotation output member (303); The short fixing ear (1032) is located at the far side of the positioning seat (311).

12. The linear cutting stapler according to claim 11, characterized in that: It also includes a positioning seat (311), wherein the positioning seat (311) is fixed on the nail anvil support; The positioning seat (311) is in an inverted L shape; A rectangular hole is provided at the short side, and the rectangular hole is plugged into the anvil on the anvil support (103); An axial hole is provided on the long side for the second rotation output member (303) to pass through and there is a gap between the second rotation output member (303); The nail anvil support (103) has two symmetrical long fixing ears (1031) on the left and right and two symmetrical short fixing ears (1032) on the left and right, wherein the long fixing ears (1031) are provided with long grooves, and the short fixing ears (1032) are provided with round holes; The bottom ends of the first connecting rods (1071) in the two sets of connecting rod mechanisms (107) are respectively hinged to the long slots of the long fixing ears (1031) via a connecting pin; The bottom ends of the second connecting rods (1072) in the two sets of connecting rod mechanisms (107) are both hinged to the same connecting pin passing through the circular holes of the two short fixing ears (1032); The short fixing ear (1032) is located on the proximal side of the positioning seat (311), the connecting pin in the short fixing ear (1032) is located above the second rotation output member (303), and the long fixing ear (1031) is located on the distal side of the positioning seat (311).

13. The linear cutting stapler according to claim 9, 11 or 12, characterized in that: A positioning block (3112) is formed at the bottom of the long side, and the positioning block (3112) is plugged into a positioning hole on the anvil bracket for positioning.

14. The linear cutting stapler according to claim 1, characterized in that: The first rotation output member (302) is sleeved on the switching member (304), and the first rotation output member (302) and the switching member (304) are coaxial.

15. The linear cutting stapler according to claim 14, characterized in that: The first rotation output member (302) is a first bevel gear, which is sleeved on the switching member (304); The linear cutting stapler further comprises a second bevel gear (201), a closing screw (202) and a closing nut (203). The first bevel gear meshes with the second bevel gear (201) when the switching member (304) is located at the first position, the second bevel gear (201) is fixedly sleeved with the closing screw (202), the closing nut (203) is screwed onto the closing screw (202), and the nail magazine support (101) is sleeved onto the closing nut (203).

16. The linear cutting stapler according to claim 1, characterized in that: The inner wall at the far end of the switching member (304) is provided with at least two circumferentially spaced stoppers (3042), the at least two stoppers (3042) being staggered along the diameter, the second rotating output member (303) being provided with a radially penetrating slide groove (3036), a slider (315) being supported in the slide groove (3036) so as to be movable along the radial direction of the second rotating output member (303), at least one end of the slider (315) extending out of the slide groove (3036), the stoppers (3042) and the slider (315) being used to form a driving connection between the switching member (304) and the second rotating output member (303); When the switching member (304) is located at the first position, the stopper (3042) is located at the far side of the sliding block (315); When the switching member (304) is located at the second position, the stopper (3042) corresponds to the sliding block (315) in the circumferential direction.

17. The linear cutting stapler according to claim 16, characterized in that: The proximal end of the sliding block (315) is tapered, and the inner side surface of the distal end of the stopper (3042) is provided with an inclined surface inclined outwardly toward the distal side.

18. The linear cutting stapler according to claim 16, characterized in that: The slider (315) is provided with a strip hole, the length direction of the strip hole is along the radial direction of the second rotation output member (303), and the slider (315) is supported on the second rotation output member (303) via a rod passing through the strip hole.

Images