A stapler

Abstract

The present invention belongs to the field of medical devices, and in particular to a stapler. In the stapler, a parallel closing mechanism enables the staple magazine support and the staple anvil support to be parallel when opening and closing. The output sleeve is rotatably sleeved on the outside of the input shaft, and the output sleeve drives the staple magazine support to move up and down. The output shaft is rotatably and coaxially arranged on the far side of the input shaft, and the output shaft is connected to the firing screw. The switching sleeve is sleeved on the outside of the input shaft and the output shaft, and the switching sleeve is connected to the input shaft in a manner that it can be driven to rotate and the switching sleeve can move axially between a first switching position and a second switching position. When the switching sleeve is in the first switching position, the switching sleeve drives the output sleeve to rotate, and the switching sleeve is separated from the output shaft. When the switching sleeve is in the second switching position, the switching sleeve is separated from the output sleeve, and the switching sleeve drives the output shaft to rotate. The stapler ensures that the opening and closing of the staple magazine support and the staple anvil support are parallel and stable, and has 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 stapler. Background Art

[0002] The stapler is a surgical instrument used to complete the cutting and closing of tissues. The distal end of the stapler has a stapler and anvil. When the stapler and anvil are in a separated state, the tissue to be cut is placed between the stapler and anvil, and then the distance between the stapler and anvil is adjusted to squeeze the tissue. When the distance between the stapler and anvil reaches the safe range for effective cutting and suturing, the stapler is fired, and the tissue is cut by compressing the U-shaped staples into B-shaped staples and then using the blade.

[0003] Chinese invention patent CN106388893B discloses a linear cutting stapler, in which a motor and a switching mechanism are used to realize the switching supply of closing power and actuating power. 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 parallelism, the switching is completed by using structures such as a switching ring, a switching button, a first switching ring and a second switching ring. Such a structure is complex, especially the radial area is large, which makes the stapler thicker.

[0004] Therefore, how to strike a balance between closed stability and structural simplification is a technical problem that urgently needs to be solved 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 stapler that has both stable closure and simplified 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 stapler, comprising a stapler bracket, a stapler anvil bracket and a firing screw, characterized in that it also comprises a parallel closing mechanism, an input shaft, an output sleeve, an output shaft and a switching sleeve; the parallel closing mechanism is connected to the stapler bracket or connected to the stapler bracket and the stapler anvil bracket simultaneously in a manner that the stapler bracket and the stapler anvil bracket are parallel when opening and closing; the output sleeve is rotatably sleeved on the outside of the input shaft, and the output sleeve is connected to the stapler bracket in a manner that its rotation is converted into an up and down movement of the stapler bracket; the output shaft is rotatable and arranged on the withdrawal side of the input shaft, and the output shaft is connected to the firing screw in a manner that its rotation is converted into rotation of the firing screw; the switching sleeve is sleeved on the outside of the input shaft, and the switching sleeve is connected to the input shaft in a manner that it can be driven to rotate and the switching sleeve can be axially moved between a first switching position and a second switching position; when the switching sleeve is at the first switching position, the switching sleeve is connected to the output sleeve in a manner that it is driven to rotate, and the switching sleeve is separated from the output shaft; when the switching sleeve is at the second switching position, the switching sleeve is separated from the output sleeve, and the switching sleeve is connected to the output shaft in a manner that it is driven to rotate.

[0010] Preferably, the input shaft, the output shaft, the output sleeve and the switching sleeve are coaxial.

[0011] Preferably, the switching sleeve is located distally from the output sleeve.

[0012] Preferably, the output shaft is located distally of the input shaft.

[0013] Preferably, the output shaft is axially spaced from the input shaft.

[0014] Preferably, the stapler further comprises a switching drive member, which is connected to the switching sleeve in a manner that allows relative rotation and axial movement.

[0015] Preferably, the switching sleeve is sleeved outside the input shaft and the output shaft in both the first switching position and the second switching position.

[0016] Preferably, the parallel closing mechanism forms a plurality of connection positions spaced apart along the axial direction with the nail magazine support and the nail anvil support respectively.

[0017] Preferably, the parallel closing mechanism comprises two groups of link mechanisms, each group of link mechanisms comprises a first link and a second link which are hinged to each other, the first link and the second link are of equal length, and the hinge between the first link and the second link is located at the length center of the first link and the second link.

[0018] Preferably, one end of the first link in the two groups of link mechanisms is hinged to the anvil bracket through two connecting pins, 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 in the two groups of link mechanisms is hinged to the nail magazine bracket through the same connecting pin, 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 position where the first link is connected to the anvil bracket is located at the far side of the position where the second link is connected to the anvil bracket.

[0019] Preferably, one end of the first link in the two groups of link mechanisms is rotatably and slidably connected to the anvil bracket through two connecting pins, and the other end of the first link in the two groups of link mechanisms is hinged to the nail magazine bracket through the same connecting pin; one end of the second link in the two groups of link mechanisms is rotatably and slidably connected to the nail magazine bracket through the same connecting pin, and the other end of the second link in the two groups of link mechanisms is hinged to the anvil bracket through the same connecting pin; the position where the first link is connected to the anvil bracket is located at the far side of the position where the second link is connected to the anvil bracket.

[0020] Preferably, a switching slider which can move axially and radially is connected to the input shaft, and the switching slider is connected to the switching sleeve in such a way that they can move axially together and rotate around the axis of the input shaft together, and at least one of the two radial ends of the switching slider protrudes to the outside of the input shaft; a driving block is provided on the hole wall of the output sleeve; when the switching sleeve is in the first switching position, the switching slider corresponds to the driving block in the circumferential direction; when the switching sleeve is in the second switching position, the switching slider is staggered with the driving block.

[0021] Preferably, the switching sleeve is located at the distal side of the output sleeve, the proximal end of the switching slider is tapered, and the distal inner wall of the driving block is inclined backward and outward to form an inclined surface.

[0022] Preferably, at least two drive blocks spaced apart in the circumferential direction are provided, and any two drive blocks are staggered with respect to the diameter.

[0023] Preferably, a stopper is provided on the inner wall of the distal end of the switching sleeve, a radially movable transmission slider is provided on the output shaft, and at least one of the two radial ends of the transmission slider protrudes to the outside of the output shaft;

[0024] When the switching sleeve is located at the first switching position, the stopper is staggered with the transmission slider; when the switching sleeve is located at the second switching position, the stopper is circumferentially corresponding with the transmission slider.

[0025] Preferably, at least two axially spaced stops are provided, and any two stops are staggered along the diameter.

[0026] Preferably, the output shaft is located at the far side of the input shaft; the inner wall of the far end of the stopper is inclined backward and outward to form an inclined plane; and the proximal end of the transmission slider is tapered.

[0027] Preferably, a concave-convex matching structure is provided between the switching sleeve and the input shaft, and when the switching sleeve is located at the first switching position and the second switching position, the concave-convex matching structure between the switching sleeve and the input shaft is driven and connected.

[0028] Preferably, a concave-convex matching structure is arranged between the switching sleeve and the input shaft. When the switching sleeve is located at the first switching position, the concave-convex matching structure between the switching sleeve and the output shaft is disengaged. When the switching sleeve is located at the second switching position, the concave-convex matching structure between the switching sleeve and the output shaft is driven and connected.

[0029] Preferably, a concave-convex matching structure is arranged between the switching sleeve and the output sleeve. When the switching sleeve is located at the first switching position, the concave-convex matching structure between the switching sleeve and the output sleeve drives the connection. When the switching sleeve is located at the second switching position, the concave-convex matching structure between the switching sleeve and the output sleeve disengages.

[0030] Preferably, a first engaging member is provided on the switching sleeve, and a second engaging member is provided on the output sleeve; at least a plurality of third engaging members spaced apart along the axial direction are provided on the switching sleeve, at least a plurality of fourth engaging members spaced apart along the axial direction are provided on the input shaft, and a fifth engaging member is provided on the output shaft; when the switching sleeve is located in the first switching position, the first engaging member and the second engaging member are drivingly connected, the third engaging member and the fourth engaging member are drivingly connected, and the third engaging member and the fifth engaging member are axially separated; when the switching sleeve is located in the second switching position, the proximal third engaging member and the fourth engaging member are drivingly connected, the distal third engaging member and the fifth engaging member are drivingly connected, and the first engaging member and the second engaging member are axially separated.

[0031] Preferably, one of the first engaging member and the second engaging member is an arched spring buckle, and the other is an arched engaging groove, one of the third engaging member and the fourth engaging member is an arched spring buckle, and the other is an arched engaging groove, and the fifth engaging member is the same as the fourth engaging member.

[0032] Preferably, it also includes a first bevel gear, a second bevel gear, a closing screw and a closing nut; the first bevel gear is fixedly sleeved on the outside of the output sleeve, the second bevel gear is meshed with the first bevel gear, the closing screw is fixedly connected to the second bevel gear, the closing nut is screwed on the closing screw, and the nail magazine bracket is provided with a mounting hole for fixing the closing nut.

[0033] Preferably, an annular groove or an annular protrusion is provided on the outer wall of the switching sleeve; the switching drive member includes a toggle member and an engaging piece, the engaging piece 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.

[0034] (III) Beneficial effects

[0035] The beneficial effects of the present invention are:

[0036] The 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 coordinated and simplified to form an axially movable selective driving connection between the switching sleeve and the output sleeve and the output shaft, so that the rotation of the input shaft can be selectively provided to the output sleeve and the output shaft. The structure is simple, compact, low-cost, and suitable for mass production.

[0037] In the present invention, the output shaft is coaxially arranged with the input shaft, and the switching sleeve and the output sleeve are arranged outside the input shaft, so that the main components for power switching are arranged along an axis, the structure is simpler, and the radial area in the anastomosis device is smaller, which is conducive to its grasping and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is an exploded schematic diagram of the stapler provided in Example 1, wherein the handle of the stapler is not shown; Figure 2 It is an exploded schematic diagram of the stapler magazine mechanism of the stapler in Example 1; Figure 3 is an exploded schematic diagram of the power switching mechanism of the stapler in Example 1; Figure 4 for Figure 1 A schematic partial cross-sectional view of the stapler in the embodiment of the present invention when the switching sleeve is located at the first switching position; Figure 5 for Figure 1 A schematic partial cross-sectional view of the stapler in the embodiment of the present invention when the switching sleeve is located at the second switching position; Figure 6 is a schematic partial cross-sectional front view of the stapler of Example 2 when the switching sleeve is located at the first switching position, wherein the handle of the stapler is not shown; Figure 7 for Figure 6 A schematic partial cross-sectional view of the stapler when the switching sleeve is located at the second switching position; Figure 8 is a schematic partial cross-sectional front view of the stapler of Example 3 when the switching sleeve is located at the first switching position, wherein the handle of the stapler is not shown; Fig. 9 for Figure 8 A schematic partial cross-sectional view of the stapler when the switching sleeve is located at the second switching position; Fig.10 is a schematic structural diagram of a parallel closing mechanism in the stapler of Example 6; Fig.11 It is a structural schematic diagram of the guide mechanism of the parallel closing mechanism in the stapler of Example 7; Fig.12 This is a schematic diagram of the structure of the guide mechanism of the parallel closing mechanism in the stapler of Example 8.

[0039] [Description of Reference Numerals]

[0040] 1: Nail magazine mechanism; 101: Nail magazine; 102: Nail magazine bracket; 1021: Mounting hole; 103: Nail anvil; 104: Nail anvil bracket; 1041: Long fixing ear; 1042: Short fixing ear; 1043: Long slot; 1044: Round hole; 105: Firing screw; 106: Firing nut; 1061: Blade; 1062: Nail pusher; 107: Link mechanism; 1071: First link; 1072: Second link; 108: Guide mechanism; 1081: U-shaped frame; 1082: Vertical guide rail; 1083: Slider; 109: Guide mechanism; 1091: Slide rail; 1092: slider; 110: first bending frame; 111: second bending frame; 2: power transmission mechanism; 201: input shaft; 2011: first input shaft section; 2012: second input shaft section; 2013: third input shaft section; 2014: annular protrusion; 2015: strip slide groove; 2016: strip groove; 2018: second arched joint groove; 202: input shaft bearing; 203: input shaft bearing seat; 2031: annular step; 2032: annular rib; 204: output sleeve; 2041: drive block; 2042: first arched joint Groove; 2043: first groove; 205: output sleeve sleeve; 206: output sleeve seat; 207: output shaft; 2071: first output shaft segment; 2072: second output shaft segment; 2073: third output shaft segment; 2074: support hole; 2075: slide groove; 2076: step surface; 2077: axial plug hole; 2078: third arched joint groove; 208: output shaft bearing; 209: output shaft bearing seat; 210: switching sleeve; 2101: slot; 2102: stopper; 2103: annular protrusion; 2104: first mounting hole; 21 05: first arch snap buckle; 2106: second mounting hole; 2107: second arch snap buckle; 2108: bump; 211: switching slider; 2111: strip hole; 212: transmission slider; 2121: strip hole; 213: switching drive member; 2131: engaging piece; 2132: toggle member; 214: C-shaped retaining ring; 215: rod body; 216: rod; 217: output shaft sleeve; 2171: second groove; 3: transmission mechanism; 301: first bevel gear; 302: second bevel gear; 303: closing screw; 304: closing nut: 305: bearing. DETAILED DESCRIPTION

[0041] 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".

[0042] Example 1

[0043] Reference Figures 1 to 5This embodiment provides a stapler, which includes a stapler mechanism 1 , a transmission mechanism 3 , a power source and a power transmission mechanism 2 .

[0044] The nail magazine mechanism 1 includes a nail magazine 101, a nail magazine support 102, a nail anvil 103, a nail anvil support 104, a firing screw 105 and a firing nut 106. The nail magazine 101 is supported on the nail magazine support 102, and the nail anvil 103 and the firing screw 105 are supported on the nail anvil support 104. The distance between the nail magazine support 102 and the nail anvil support 104 determines the distance between the nail magazine 101 and the nail anvil 103. Therefore, the distance between the nail magazine 101 and the nail anvil 103 is controlled by driving the distance between the nail magazine support 102 and the nail anvil support 104 to change, that is, the closing and opening actions of the nail magazine 101 and the nail anvil 103. The firing nut 106 is sleeved on the firing screw 105, and the bidirectional rotation of the firing screw 105 is converted into the bidirectional axial movement of the firing nut 106 to complete the firing action.

[0045] In this embodiment, the firing nut 106 includes a square main body portion and a nail pushing block 1062 connected to the square main body portion, the nail pushing block 1062 is used to push the slider in the nail magazine 101 to complete the nailing of the U-shaped suture nails, the square main body portion has a threaded hole that is screwed with the firing screw 105, the square design of the main body portion is conducive to limiting the firing nut 106 to move only in the axial direction, and a blade 1061 is provided above the square main body portion for cutting tissue.

[0046] The other structures of the staple cartridge mechanism 1 are prior art and will not be described in detail here.

[0047] The power source is a device that provides rotational power, and a motor is generally selected.

[0048] The power transmission mechanism 2 is used to selectively convert the rotation of the power source into the closing and opening power of the nail magazine 101 and the nail anvil 103 and the firing power.

[0049] Specifically, the power transmission mechanism 2 of this embodiment includes an input shaft 201, two input shaft bearings 202, an input shaft bearing seat 203, an output sleeve 204, an output sleeve sleeve 205, an output sleeve seat 206, an output shaft 207, an output shaft bearing 208, an output shaft bearing seat 209, a switching sleeve 210, a switching slider 211, a transmission slider 212 and a switching drive 213.

[0050] The input shaft 201 includes a first input shaft segment 2011, a second input shaft segment 2012 and a third input shaft segment 2013 which are connected in sequence from near to far and are coaxial. The diameter of the first input shaft segment 2011 is smaller than the diameter of the second input shaft segment 2012, the diameter of the second input shaft segment 2012 is larger than the diameter of the third input shaft segment 2013, and the diameter of the first input shaft segment 2011 is equal to the diameter of the third input shaft segment 2013.

[0051] The proximal end of the first input shaft segment 2011 is used to connect with the power source. Of course, in other embodiments, the input shaft itself can be the output shaft of the power source. A C-shaped retaining ring 214 is provided at the connection between the first input shaft segment 2011 and the second input shaft segment 2012. The C-shaped retaining ring 214 is fixed on the input shaft bearing seat 203. The input shaft bearing seat 203 is fixed on the main housing. The shape of the input shaft bearing seat 203 is a rectangular parallelepiped, which is convenient for positioning and fixing in the main housing. An input shaft bearing 202 is supported in the input shaft bearing seat 203. An annular protrusion 2014 is provided on the second input shaft segment 2012. An annular step 2031 is provided on the inner wall of the input shaft bearing seat 203 at a position corresponding to the annular protrusion 2014. The input shaft bearing 202 is axially limited between the C-shaped retaining ring 214 and the annular protrusion and the annular step 2031. A transition surface is formed between the second input shaft segment 2012 and the third input shaft segment 2013 , and an annular rib 2032 is provided on the distal inner wall of the first input shaft bearing seat 203 , and the other input shaft bearing 202 is axially limited between the transition surface and the rib.

[0052] The input shaft 201 is supported in two input shaft bearings 202. Thus, the axes of the two input shaft bearings 202 coincide and determine the axis of the input shaft 201. The axis of the input shaft 201 is perpendicular to the opening and closing direction of the nail magazine 101 and the nail anvil 103, and is parallel to the extension direction of the nail magazine support 102 and the nail anvil support 104, that is, parallel to the front-back direction.

[0053] A strip-shaped slide groove 2015 is provided on the third input shaft segment 2013, the length direction of which is parallel to the axial direction of the input shaft 201, and the strip-shaped slide groove 2015 runs through the radial direction of the third input shaft segment 2013. Meanwhile, two strip-shaped grooves 2016 are provided on the opposite side walls of the third input shaft segment 2013, i.e., the two strip-shaped grooves 2016 are symmetrically located on both sides of the strip-shaped slide groove 2015, and the length direction of the strip-shaped groove 2016 is along the axial direction of the input shaft 201. The length of the strip-shaped groove 2016 is shorter than that of the strip-shaped slide groove 2015, and the proximal end of the strip-shaped slide groove 2016 is located at the distal side of the proximal end of the strip-shaped slide groove 2015, and the distal end of the strip-shaped slide groove 2016 is located at the proximal side of the distal end of the strip-shaped slide groove 2015. In this embodiment, the strip-shaped slide groove 2015 is located at the rear of the input shaft.

[0054] The switching slider 211 is in a plate shape and is inserted into the strip-shaped sliding groove 2015 . A strip hole 2111 is provided on the switching slider 211, and the length direction of the strip hole 2111 is along the radial direction of the input shaft 201, that is, the length direction of the strip hole 2111 is perpendicular to the length direction of the above-mentioned strip groove 2016, a rod body 215 passes through the strip hole 2111 and the two ends of the rod body 215 pass through the above-mentioned two strip grooves 2016, at least one of the radial ends of the switching slider 211 protrudes to the outside of the strip groove 2015, that is, when the switching slider 211 rotates to the vertical orientation and stops without the action of external force, the switching slider 211 is hung on the rod body 215 due to gravity, and the lower end of the switching slider 211 protrudes from the strip groove 2015 at this time. Of course, in this embodiment, the radial ends of the switching slider 211 both protrude to the outside of the strip groove 2015 to ensure smooth driving connection. Thus, the switching slider 211 is inserted into the strip slide groove 2015, and the switching slider 211 can move bidirectionally along the strip slide groove 2015 in the axial direction of the input shaft 201, and can move bidirectionally in the radial direction of the input shaft 201. At the same time, if the input shaft 201 rotates, the switching slider 211 will be driven to rotate. The proximal end of the switching slider 211 is gradually reduced to form two upper and lower inclined surfaces.

[0055] The output shaft 207 is arranged at the far side of the input shaft 201, and is coaxially arranged with the input shaft 201, but is axially spaced from the input shaft 201, that is, it does not butt with the input shaft 201. The output shaft 207 includes a first output shaft segment 2071, a second output shaft segment 2072, and a third output shaft segment 2073, which are sequentially connected and coaxial from near to far. The diameter of the first output shaft segment 2071 is smaller than the diameter of the second output shaft segment 2072, and the diameter of the second output shaft segment 2072 is smaller than the diameter of the third output shaft segment 2073.

[0056] A radially penetrating groove 2075 is provided on the first output shaft segment 2071, that is, the proximal part of the output shaft 207, and a transmission slider 212 is inserted in the groove 2075. A strip hole 2121 is provided on the transmission slider 212, and the length direction of the strip hole 2121 is along the radial direction of the output shaft 207. Support holes 2074 are provided on both sides of the output shaft 207 symmetrically along the groove 2075. A rod 216 passes through the strip hole 2121, and both ends of the rod 216 are supported on two support holes 2074. Thus, the transmission slider 212 can be supported in the slide groove 2075 in a bidirectional radially movable manner along the output shaft 207, and at least one of the two radial ends of the transmission slider 212 protrudes to the outside of the slide groove 2075, that is, when the transmission slider 212 rotates to the vertical orientation and stops without the action of external force, the upper end surface of the strip hole 2121 of the transmission slider 212 is hung on the rod 216 due to gravity, and the lower end of the transmission slider 212 protrudes from the slide groove 2075. Of course, in this embodiment, both radial ends of the transmission slider 212 protrude to the outside of the slide groove 2075 to ensure smooth driving connection. The proximal end of the transmission slider 212 is gradually reduced to form two inclined surfaces.

[0057] The output shaft bearing 208 is supported in the output shaft bearing seat 209. The side wall of the output shaft bearing seat 209 is fixed to the nail anvil bracket by a fixing pin. The shape of the output shaft bearing seat 209 is a rectangular parallelepiped, which is convenient for positioning and fixing in the nail anvil bracket. At the same time, the upper wall of the output shaft bearing seat 209 is connected to the proximal end of the nail anvil 103 by a fixing pin, and the lower wall of the output shaft bearing seat 209 is connected to the proximal end of the nail anvil bracket 104 by a fixing pin. A transition surface is formed between the first output shaft segment 2071 and the second output shaft segment 2072. The position of the transition surface corresponds to the distal end of the output shaft bearing seat 209, and the inner wall of the output shaft bearing seat 209 forms a step surface 2076 corresponding to the position of the transition surface. The distal end surface of the output shaft bearing 208 abuts against the transition surface and the step surface 2076. At the same time, the output shaft bearing 208 and the output shaft bearing seat 209 are interference fit. The output shaft 207 is supported in the output shaft bearing 208, thereby forming a bidirectional rotation arrangement.

[0058] The transition surface formed between the second output shaft segment 2072 and the third output shaft segment 2073 is located outside the output shaft bearing seat 209. The distal end of the third output shaft segment 2073 has an axial plug hole 2077, and the axial plug hole 2077 forms a plug connection with the proximal end of the firing screw 105 that can drive two-way rotation. In this embodiment, the axial plug hole 2077 is a D-shaped hole, and the proximal end of the firing screw 105 is a D-shaped column. Of course, in other embodiments, the axial plug hole 2077 can also be set as a non-circular hole, and the proximal end of the firing screw 105 can be set as a non-circular column. The axis of the output shaft coincides with the axis of the firing screw 105.

[0059] The output sleeve 204 can be bidirectionally rotatably sleeved on the outside of the input shaft 201 but is spaced from the input shaft 201, that is, it is not in direct contact with the input shaft 201. The output sleeve 204 is sleeved on the outside of the output sleeve 204 with a sleeve or a bearing, and the sleeve or the bearing is supported in the output sleeve seat 206. The output sleeve seat 206 is fixed in the main housing. The shape of the output sleeve seat 206 is a rectangular parallelepiped, which is convenient for positioning and fixing in the main housing. The axis of the output sleeve 204 coincides with the axis of the input shaft 201. Therefore, the output sleeve 204 can be bidirectionally rotatably arranged. In this embodiment, the output sleeve seat 206 is located on the far side of the input shaft bearing seat 203 and on the near side of the output shaft bearing seat 209. The function of the output sleeve 204 is to output the rotation to the transmission mechanism 3, and then the transmission mechanism 3 is converted into the up and down movement of the nail magazine bracket 102.

[0060] Specifically, the transmission mechanism 3 includes a first bevel gear 301 fixedly sleeved on the outside of the output sleeve 204, a second bevel gear 302 meshing with the first bevel gear 301, a closing screw 303 fixedly connected to the second bevel gear 302, and a closing nut 304 screwed on the closing screw 303. The lower end of the closing screw 303 is supported on the input shaft bearing seat 203 for bidirectional rotation through a bearing, and the upper end of the closing screw 303 is supported on the main housing through a bearing 305. There is a mounting hole 1021 on the nail magazine bracket 102, and the mounting hole 1021 is fastened on the closing nut 304 so that the closing nut 304 is fixedly connected to the nail magazine bracket 102, and the axis of the closing screw 303 is perpendicular to the axis of the input shaft. Thus, the output sleeve 204 is connected to the staple cartridge support 102 in a manner that the bidirectional rotation of the output sleeve 204 is converted into the up-and-down movement of the staple cartridge support 102, and the output shaft 207 is connected to the firing screw 105 in a manner that the bidirectional rotation of the output shaft 207 is converted into the bidirectional rotation of the firing screw 105. Thus, in this embodiment, the first bevel gear 301 is always meshed with the second bevel gear 302, avoiding the problem of the first bevel gear 301 being subjected to a large force during the process of disengagement and meshing with the second bevel gear 302. Of course, in other embodiments, according to the enlightenment given by this embodiment, the output shaft 207 is connected to the staple cartridge support 102 in a manner that the bidirectional rotation thereof is converted into the up-and-down movement of the staple cartridge support 102, and the output sleeve 204 is connected to the firing screw 105 in a manner that the bidirectional rotation of the output sleeve 204 is converted into the bidirectional rotation of the firing screw 105.

[0061] Three driving blocks 2041 are provided on the distal hole wall of the output sleeve 204, wherein any two driving blocks 2041 are staggered relative to the diameter, and the distal inner wall of the driving block 2041 is tilted backward and outward to form an inclined surface, and the inclined surface of the driving block 2041 has the same inclination as the inclined surface on the switching slider 211, which is conducive to the push between the two (described in detail later). In other embodiments, the number of driving blocks 2041 is not limited to three, and can also be two or more than three. When two driving blocks 2041 are provided, the idling stroke will be larger. Considering various parameters such as idling stroke and product size, three driving blocks 2041 are a better choice. The driving block 2041 and the output sleeve 204 are an integrally formed part or connected in a fixed connection manner, so that the driving block 2041 and the output sleeve 204 do not move relative to each other during operation.

[0062] In this embodiment, whether in the first switching position or the second switching position (these two positions will be described in detail later), the switching sleeve 210 is always sleeved on the outside of the input shaft 201 and the output shaft 207 at the same time, and is located on the far side of the output sleeve 204, and the axis of the switching sleeve 210 coincides with the axis of the input shaft 201. Of course, in other embodiments, the switching sleeve 210 may be located only on the outside of the input shaft 201 when it is in the first switching position, and then be located on the outside of the input shaft 201 and the output shaft 207 when it moves to the second switching position. However, the structure of this embodiment is conducive to shortening the axial dimension, making the structure more compact. At the same time, the switching sleeve 210 can also be on the other side of the axial direction of the output sleeve, and other structures adjust their positions accordingly.

[0063] Two supporting holes 2074 are provided on the proximal opposite side walls of the switching sleeve 210 (i.e., on both sides relative to the strip-shaped slide groove 2015), and the two ends of the rod body 215 for supporting the switching slider 211 respectively pass through the two supporting holes 2074, thereby, the switching sleeve 210 and the switching slider 211 form a driving connection for simultaneous bidirectional axial movement and bidirectional rotation. At the same time, the rod simultaneously passes through the strip groove 2016 on the input shaft 201 and the supporting holes on the switching sleeve 210, and also connects the switching sleeve 210 with the input shaft 201, so that the input shaft 201 and the switching sleeve 210 can be driven to rotate in both directions and the switching sleeve 210 can move in both directions along the input shaft 201 between the first switching position and the second switching position (the first switching position is located on the proximal side of the second switching position), and at the same time, the switching slider 211 is connected with the switching sleeve 210 in a manner of bidirectional axial movement and bidirectional rotation around the axis of the input shaft 201. Generally speaking, the proximal end surface of the strip groove 2016 of the input shaft 201 defines the first switching position, and the distal end surface of the strip groove 2016 of the input shaft 201 defines the second switching position. The switching sleeve 210 is also provided with slots 2101 corresponding to the radial ends of the switching slider 211 to make way for the movement of the switching slider 211.

[0064] The inner wall at the far end of the switching sleeve 210 is provided with three circumferentially spaced blocks 2102, and any two blocks 2102 are staggered along the diameter. The inner wall at the far end of the block 2102 is tilted backward and outward to form an inclined plane, and the inclination of the inclined plane is the same as the inclination of the inclined plane on the transmission slider 212, which is conducive to the push between the two (described in detail later). In other embodiments, the number of blocks 2102 is not limited to three, and can also be two or more than three. When two blocks 2102 are provided, the idling stroke will be larger. Considering various parameters such as idling stroke and product size, three blocks 2102 are a better choice. The block 2102 and the switching sleeve 210 are an integrally formed part or connected in a fixed connection manner, so that the block 2102 and the switching sleeve 210 do not move relative to each other during operation.

[0065] like Figure 4 As shown, when the switching sleeve 210 is located at the first switching position:

[0066] The switching slider 211 corresponds to the driving block 2041 circumferentially. At this time, the switching slider 211 may be in circumferential contact with the driving block 2041, or there may be a circumferential gap between them. However, once the switching slider 211 rotates a certain angle with the input shaft 201, it will form a circumferential contact with the driving block 2041, and finally the switching slider 211 pushes the driving block 2041 to move, thereby forming a connection between the switching sleeve 210 and the output sleeve 204 in a manner of driving bidirectional rotation.

[0067] At the same time, the stopper 2102 on the switching sleeve 210 is located near the transmission slider 212, that is, the stopper 2102 and the transmission slider 212 are staggered, so that the switching sleeve 210 is separated from the output shaft 207, and the rotation of the switching sleeve 210 will not drive the output shaft 207 to rotate.

[0068] When the switching sleeve 210 moves backward (i.e., toward the far side) from the first switching position, it drives the switching slider 211 to move backward together. When the switching slider 211 moves backward, it slides along the strip groove 2015 on the input shaft 201, and the rod body 215 on the switching slider 211 slides along the strip groove 2016 on the input shaft 201. At this time, the switching slider 211 still maintains a driving rotation connection with the input shaft 201.

[0069] like Figure 5 As shown, when the switching sleeve 210 is located at the second switching position:

[0070] The switching slider 211 is located on the far side of the driving block 2041, that is, the switching slider 211 and the driving block 2041 are staggered, and the switching sleeve 210 is separated from the output sleeve 204, that is, the driving connection between the two is released, and the rotation of the switching sleeve 210 will not drive the output sleeve 204 to rotate.

[0071] The stopper 2102 on the switching sleeve 210 corresponds to the transmission slider 212 in the circumferential direction. At this time, the transmission slider 212 may be in circumferential contact with the stopper 2102, or may be in circumferential contact with the transmission slider 212 with a spacing therebetween. However, when the stopper 2102 rotates a certain angle along with the switching sleeve 210, the stopper 2102 will form a circumferential contact with the transmission slider 212, and finally the stopper 2102 pushes the transmission slider 212 to move, thereby forming a connection between the switching sleeve 210 and the output sleeve 204 in a manner of driving bidirectional rotation.

[0072] Such an arrangement achieves the double-edged effect of achieving a bidirectionally movable driving connection between the input shaft and the switching sleeve and a selective driving connection between the switching sleeve and the output sleeve through a simple structure.

[0073] In actual application, the switching drive 213 controls the switching of the switching sleeve 210 between the first switching position and the second switching position along the axial direction of the input shaft 201. On the outer wall of the switching sleeve 210, an annular protrusion 2103 or an annular groove is provided at the far side of the above-mentioned slot 2101. The switching drive 213 includes a connected toggle member 2132 and an engaging piece 2131. The engaging piece 2131 has a groove end matching the shape of the annular protrusion 2103 or the annular groove. The groove end and the annular protrusion 2103 can be plugged in a relatively bidirectional rotation. The toggle member 2132 extends out of the main housing of the stapler for the operator to toggle. The toggle member 2132 is a rod.

[0074] In this embodiment, the parallel closing mechanism includes two sets of connecting rod mechanisms 107 located on the left and right sides of the nail magazine support 102, each set of connecting rod mechanisms 107 includes a first connecting rod 1071 and a second connecting rod 1072 that are hinged to each other. The first connecting rod 1071 and the second connecting rod 1072 are equal in length, and the hinge between the two is located at the center of their length, thereby dividing the first connecting rod 1071 and the second connecting rod 1072 into two isosceles triangles in the upper and lower parts. A first bending frame 110 and a second bending frame 111 are fixed to the upper wall of the nail magazine bracket 102. The first bending frame 110 and the nail magazine bracket 102 are combined to form a long groove 1043 that runs through the left and right sides. The second bending frame 111 and the nail magazine bracket 102 are combined to form a through hole that runs through the left and right sides. The nail anvil bracket 104 has two symmetrical long fixing ears 1041 on the left and right sides and two symmetrical short fixing ears 1042 on the left and right sides. The long fixing ears 1041 are provided with long grooves 1043, and the short fixing ears 1042 are provided with round holes 1044. The top ends of the first links 1071 in the two sets of link mechanisms 107 are hinged to the same connecting pin passing through the long slot on the nail magazine support 102 (i.e., the long slot formed by the first bending frame 110 and the nail magazine support 102), and the bottom ends of the first links 1071 in the two sets of link mechanisms 107 are respectively hinged to the nail anvil support 104 through connecting pins passing through the round holes 1044 of the two short fixing ears 1042. The top ends of the second links 1072 in the two sets of link mechanisms 107 are hinged to the same connecting pin passing through the through hole on the nail magazine support 102 (i.e., the through hole formed by the second bending frame 111 and the nail magazine support 102), and the bottom ends of the second links 1072 in the two sets of link mechanisms 107 are hinged to the same connecting pin passing through the long slot 1043 of the two long fixing ears 1041. Through the above structure, the top end of the first connecting rod 1071 can rotate and slide along the nail magazine bracket 102, and the bottom end of the second connecting rod 1072 can rotate and slide along the nail anvil bracket 104. In this way, the nail magazine bracket 102 can be prevented from tilting or horizontally staggered relative to the nail anvil bracket 104 during the up and down movement, that is, the nail magazine bracket 102 and the nail anvil bracket 104 are ensured to be parallel when opening and closing, and at the same time, the pressure at the connection between the nail magazine bracket 102 and the closing nut 304 is relieved, so that the setting of the power transmission mechanism 2 can be made into a more optimized and simplified design without considering the pressure here.

[0075] The long fixing ear 1041 is located on the proximal side of the firing nut, and is arranged axially corresponding to the position of the output sleeve seat and the transmission slider. The connecting pin in the long fixing ear 1041 is located above the output sleeve seat, that is, above the output sleeve. The short fixing ear 1042 is located on the distal side of the output sleeve seat, and the connecting pin in the short fixing ear 1042 is located above the anvil 103 on the anvil bracket 104.

[0076] Of course, in other embodiments, the positions of the long fixing ears 1041 and the short fixing ears 1042 are exchanged, and connecting pins are respectively provided in the two long fixing ears to connect with the two first connecting rods respectively, while only one connecting pin is passed through the two short fixing ears 1042 to connect with the two second connecting rods at the same time, and at the same time, the positions of the first bending frame 110 and the second bending frame 111 are also interchanged. Thus, one end of the first connecting rod 1071 in the two groups of connecting rod mechanisms is rotatably and slidably connected to the nail anvil support 104 through two connecting pins, and the other end of the first connecting rod 1071 in the two groups of connecting rod mechanisms 107 is hinged to the nail magazine support 102 through the same connecting pin; one end of the second connecting rod 1072 in the two groups of connecting rod mechanisms 107 is rotatably and slidably connected to the nail magazine support 102 through the same connecting pin, and the other end of the second connecting rod 1072 in the two groups of connecting rod mechanisms 107 is hinged to the nail anvil support 104 through the same connecting pin.

[0077] 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.

[0078] In summary, the stapler in this embodiment can perform the following actions:

[0079] first step:

[0080] When the toggle member 2132 is located at the proximal limit position (this proximal limit position can be limited by the slide groove 2075 on the main shell of the stapler, or by the strip groove 2016 or the strip slide groove 2015 associated with the switching slider 211), the switching sleeve 210 is located at the first switching position. At this time, the switching slider 211 corresponds to the driving block 2041 on the output sleeve 204 in circumferential direction, and the switching sleeve 210 and the output sleeve 204 are in a connected state of driven rotation. At the same time, the block 2102 of the switching sleeve 210 is located on the proximal side of the transmission slider 212, and the switching sleeve 210 is separated from the output shaft 207. In this state, the motor is started, and the rotation of the input shaft 201 drives the switching sleeve 210 and the switching slider 211 to rotate through the rod body 215. The switching slider 211 pushes the output sleeve 204 to rotate, and then drives the nail magazine bracket 102 to move downward through the transmission mechanism 3, and the connecting rod mechanism 107 between the nail magazine bracket 102 and the nail anvil bracket 104 is closed, and the nail magazine bracket 102 and the nail anvil bracket 104 are closed in parallel. At the same time, the switching sleeve 210 is separated from the output shaft 207, the output shaft 207 does not rotate, and the firing screw 105 does not rotate.

[0081] Step 2:

[0082] Stop the operation of the motor, and the operator drives the toggle member 2132 toward the distal side to the distal limit position (this distal limit position can be limited by the slide groove 2075 on the main shell of the stapler, or by the strip groove 2016 or the strip slide groove 2015 associated with the switching slider 211), driving the switching sleeve 210 to move toward the second switching position, and the switching slider 211 follows the movement of the switching sleeve 210 and gradually disengages from the driving block 2041. The stop block 2102 on the switching sleeve 210 gradually moves to correspond to the circumferential direction of the transmission slider 212, and the switching sleeve 210 forms a driving connection with the output shaft 207.

[0083] Step 3:

[0084] Start the motor, and the rotation of the input shaft 201 drives the rod body 215 on the switching slider 211 to rotate, and then drives the switching slider 211 and the switching sleeve 210 to rotate. The block 2102 on the switching sleeve 210 pushes the transmission slider 212 on the output shaft 207 to drive the output shaft 207 to rotate. The output shaft 207 drives the firing screw 105 to rotate, and the firing nut 106 moves axially backward to fire.

[0085] Step 4:

[0086] 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 input shaft 201 rotates in the reverse direction (opposite to the direction in the third step), the switching sleeve 210 rotates in the reverse direction (opposite to the direction in the third step), the output shaft 207 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 forward to return to its original position.

[0087] Step 5:

[0088] The motor is stopped, and the operator drives the toggle member 2132 to move forward to the limit position, the switching sleeve 210 returns to the first switching position, the switching slider 211 forms a circumferential correspondence with the driving block 2041, and the stopper 2102 is disengaged from the transmission slider 212. Then, the driving motor rotates in the opposite direction (opposite to the direction in the first step), the input shaft 201 rotates in the opposite direction (opposite to the direction in the first step), the switching sleeve 210 rotates in the opposite direction (opposite to the direction in the first step), and the output sleeve 204 rotates in the opposite direction (opposite to the direction in the first step), and then the closing nut 304 is driven to move upward through the transmission mechanism 3, the connecting rod mechanism 107 between the nail magazine support 102 and the nail anvil support 104 opens, the nail magazine support 102 moves upward, and the nail magazine support 102 and the nail anvil support 104 open in parallel and return to the open state.

[0089] In summary, the stapler of the present embodiment utilizes a parallel closing mechanism directly connected to the staple magazine support 102 and the staple anvil support 104 to ensure the parallel and stable opening and closing of the staple magazine support 102 and the staple anvil support 104. In particular, the mechanism for realizing switching does not need to take into account the requirement of closing stability, and is simplified to form an axially movable selective drive connection between the output sleeve 204 and the output shaft 207 and the switching sleeve 210, so that the rotation of the input shaft 201 can be selectively provided to the output sleeve 204 and the output shaft 207. The structure is simple, compact, low-cost, and suitable for mass production.

[0090] Furthermore, the input shaft 201, the output shaft 207, the output sleeve 204 and the switching sleeve 210 are arranged along an axis and the axial movement of the switching sleeve 210 realizes the selective driving connection with the output sleeve 204 and the output shaft 207, so that the rotation of the input shaft 201 can be selectively provided to the output sleeve 204 and the output shaft 207, and the structure is more compact and simple. At the same time, the stapler occupies a smaller radial area, which is convenient for its grasping and use.

[0091] Furthermore, the output shaft 207 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.

[0092] Furthermore, the purpose of setting the above-mentioned switching slider 211 / transmission slider 212 and the driving block 2041 / stop block 2102 is that the switching sleeve 210 stops at a different angle each time after rotating to the first switching position. If only one driving block 2041 / stop block 2102 is set, the stopping position of the driving block 2041 / stop block 2102 may be directly opposite to the switching slider 211 / transmission slider 212. In this way, the switching slider 211 / transmission slider 212 and the driving block 2041 / stop block 2102 will axially abut during the switching process, thereby preventing the switching sleeve 210 from forming a driving connection with the output sleeve 204 and the output shaft 207. The multiple drive blocks 2041 / blocks 2102 arranged with staggered diameters, combined with the switching slider 211 / transmission slider 212, can move radially in both directions. When the switching slider 211 / transmission slider 212 is opposite to one of the drive blocks 2041 / blocks 2102, as the switching sleeve 210 moves axially, the switching slider 211 / transmission slider 212 will be pushed radially inward by the drive block 2041 / block 2102 opposite to it (the inclined surfaces on the drive block 2041 / block 2102 and the switching slider 211 / transmission slider 212 are conducive to this pushing) so as not to hinder the switching sleeve 210 from forming a driving connection with the output sleeve 204 and the output shaft 207. The other end of the switching slider 211 / transmission slider 212 will protrude more and better correspond circumferentially to the drive block 2041 / block 2102 on the other side. Since the three driving blocks 2041 / blocks 2102 are evenly arranged and the switching slider 211 / transmission slider 212 has only two ends, there may be a certain distance between the switching slider 211 / transmission slider 212 and the driving blocks 2041 / blocks 2102 corresponding to the switching slider 211 / transmission slider 212. When the switching sleeve 210 rotates again, it will idle for a certain distance. When the driving blocks 2041 / blocks 2102 rotate to the switching slider 211 / transmission slider 212, the output sleeve 204 / output shaft 207 is pushed to rotate. This idle distance will only cause the closing time / firing staple discharge time to be slightly earlier or later, but will not affect the suturing effect. Therefore, this design can ensure the smooth switching between the closed state and the firing state. Of course, in other embodiments, the positions of the transmission slider and the block can be interchanged, the proximal end of the output shaft is set as a sleeve and the inner wall thereof is provided with a block, a shaft is set at the distal end of the switching sleeve and the transmission slider is fixed in a groove on the shaft so as to be bidirectionally radially movable, the above purpose can also be achieved, but this design requires the switching sleeve to form a shaft to reduce the overall radial size, and the component structure is more complicated. In addition, in other embodiments, setting a drive block / block can also basically achieve the above purpose, but in some cases, the drive slider / transmission slider needs to idle for almost one circle to achieve the drive connection, which is not as stable as the structure in this embodiment.

[0093] Furthermore, the parallel closing mechanism in this embodiment adopts a connecting rod mechanism 107, which has the advantages of simple structure and good effect. The position where the first connecting rod 1071 is connected to the anvil bracket 104 is located at the far side of the position where the second connecting rod 1072 is connected to the anvil bracket 104, and the two first connecting rods 1071 are separately connected to the anvil bracket 104 through independent connecting pins, which can make way for the movement of the firing nut and make the overall structure of the stapler more compact.

[0094] Furthermore, the input shaft bearing seat, output shaft bearing seat, output sleeve seat, and closing screw in this embodiment are all positioned on the main housing, and the input shaft bearing seat, output shaft bearing seat, and output sleeve seat are all constructed as a rectangular parallelepiped or a cube to facilitate positioning, so that the positioning of each rotating component is more accurate and the operation can be more stable. Among them, the input shaft bearing seat, output sleeve seat, and output shaft bearing seat can also be other input shaft seats, output sleeve seats, and output shaft seats, as long as they provide rotation support for the input shaft, output sleeve, and output shaft.

[0095] Example 2

[0096] See also Figure 6 and Figure 7 Compared with Example 1, the main difference of this embodiment lies in the connection method of the switching sleeve 210 with the input shaft 201, the output sleeve 204 and the output shaft 207.

[0097] Specifically, the proximal portion of the switching sleeve 210 is inserted between the input shaft 201 and the output sleeve 204 , and can move bidirectionally along the axis of the input shaft 201 and the output sleeve 204 .

[0098] The switching sleeve 210 is provided with a plurality of first mounting holes 2104 evenly spaced in the circumferential direction, and a first arch spring buckle 2105 (as a first engaging member) is elastically fixed in each first mounting hole 2104. The first arch spring buckle 2105 protrudes from the outer peripheral wall of the switching sleeve 210 in a natural state, and moves toward the first mounting hole 2104 when pressed down. Correspondingly, a plurality of first arch engaging grooves 2042 (as a second engaging member) are provided on the inner wall of the output sleeve 204 in the circumferential direction, and the number of the first arch engaging grooves 2042 is equal to the first mounting holes 2104, or is a multiple of the number of the first mounting holes 2104. When the switching sleeve 210 is located at the first switching position, the axial position of the first arch spring buckle 2105 corresponds to the axial position of the first arch engagement groove 2042. The first arch spring buckle 2105 may have been engaged with the first arch engagement groove 2042, or the first arch spring buckle 2105 may be pressed against the inner wall of the output sleeve 204 and have a certain distance from the first arch engagement groove 2042 in the circumferential direction. However, when the switching sleeve 210 rotates a certain angle, the first arch spring buckle 2105 naturally springs into the first arch engagement groove 2042. Therefore, the above two situations both belong to the switching sleeve 210 and the output sleeve 204 forming a driving connection. When the switching sleeve 210 is located at the second switching position, the first arch spring buckle 2105 is located at the far side of the first arch engagement groove 2042, and the two are axially separated and do not form a driving connection.

[0099] The switching sleeve 210 is provided with at least two groups of second mounting holes 2106 arranged at intervals along its axial direction, and each group of second mounting holes 2106 includes a plurality of second mounting holes 2106 evenly spaced along the circumferential direction. A second arch spring buckle 2107 (as a third coupling member) is elastically fixed in each second mounting hole 2106. The second arch spring buckle 2107 protrudes from the inner circumferential wall of the switching sleeve 210 in a natural state, and moves toward the second mounting hole 2106 when pressed downward. Correspondingly, at least two groups of second arched engagement grooves 2018 (as fourth engagement members) arranged at intervals along the axial direction are provided on the outer wall of the input shaft 201, and each group of second arched engagement grooves 2018 includes a plurality of second arched engagement grooves 2018 evenly spaced along the circumferential direction, and the number of second arched engagement grooves 2018 in each group is equal to the number of second mounting holes 2106 in each group, or is a multiple of the number of second mounting holes 2106 in each group, and the number of groups of second arched engagement grooves 2018 is the same as the number of groups of second mounting holes 2106. When the switching sleeve 210 is located at the first switching position, the axial positions of the multiple groups of second arch spring buckles 2107 correspond one by one to the axial positions of the multiple groups of second arch engaging grooves 2018. The second arch spring buckles 2107 may have been engaged with the second arch engaging grooves 2018, or the second arch spring buckles 2107 may be pressed against the outer wall of the input shaft 201 and have a certain distance from the second arch engaging grooves 2018 in the circumferential direction. However, when the input shaft 201 rotates a certain angle, the second arch spring buckles 2107 naturally spring into the second arch engaging grooves 2018. Therefore, the above two situations both belong to the switching sleeve 210 and the input shaft 201 forming a driving connection.

[0100] A plurality of third arched engagement grooves 2078 (as the fifth engagement member) are arranged evenly spaced in the circumferential direction on the outer wall of the output shaft 207, and the number of the third arched engagement grooves 2078 is equal to the number of the second mounting holes 2106 in each group, or is a multiple of the number of the second mounting holes 2106 in each group. When the switching sleeve 210 is located at the first switching position, the third arched engagement groove 2078 is located at the far side of the second arched snap button of the switching sleeve 210, and the third arched engagement groove 2078 is axially separated from the second arched snap button 2107. When the switching sleeve 210 is in the second switching position, the farthest group of second arched snaps 2107 on the switching sleeve 210 engage with the third arched engagement groove 2078, or the second arched snaps are pressed against the outer wall of the output shaft 207 and have a certain distance from the third arched engagement groove 2078 in the circumferential direction, but when the switching sleeve 210 rotates a certain angle, the farthest group of second arched snaps 2107 naturally spring into the third arched engagement groove 2078, so the above two situations both belong to the switching sleeve 210 and the output shaft 207 forming a driving connection. At this time, the nearest group of second arched snaps 2107 on the switching sleeve 210 engages with the near second group of second arched engagement grooves 2018 on the input shaft 201, and the near first group of second arched engagement grooves 2018 on the input shaft 201 is vacant.

[0101] In order to achieve a stable driving connection and axial bidirectional movement at the same time, the length direction of the rectangular flat surface of the arched snap is parallel to the axial direction of the component (the switching sleeve 210 in this embodiment), and the diameter direction of the arched engagement groove is parallel to the axial direction of the component (the input shaft, output shaft and output sleeve in this embodiment), so that the arched surface of the arched snap is convenient for the arched snap to be disengaged from the engaged arched engagement groove when the switching sleeve 210 has an axial external force. The two side planes of the arched snap can be used as circumferential thrust surfaces, which is convenient for applying thrust force for driving rotation. The number of engagement holes in the same circumferential direction is a multiple of the number of snaps, which can reduce the idling distance and facilitate smooth and effective driving connection.

[0102] Of course, there are many other variant embodiments of the design concept of the arch spring buckle and the arch engaging groove of this embodiment. For example, the positions of any of the above-mentioned sets of cooperating arch spring buckles and arch engaging grooves can be interchanged, that is, the first arch spring buckle 2105 can be arranged on the inner wall of the output sleeve 204 and the first arch engaging groove 2042 can be arranged on the switching sleeve 210, the second arch spring buckle 2107 can be separately arranged on the input shaft 201 and the output shaft 207 and the second arch engaging groove 2018 and the third arch engaging groove 2078 are correspondingly arranged on the switching sleeve 210.

[0103] The structure of this embodiment also makes the stapler simple, compact, low-cost, suitable for mass production, and occupies less radial space in the stapler, which is convenient for gripping and using. At the same time, the misalignment problem between the switching sleeve 210 and the output shaft 207 and the output sleeve 204 is solved.

[0104] Example 3

[0105] Reference Figure 8 and Fig. 9 Compared with Example 1, the main difference of this embodiment lies in the connection method of the switching sleeve 210 with the input shaft 201, the output sleeve 204 and the output shaft 207.

[0106] A sliding block is provided on the inner wall of the switching sleeve 210 , and an axial groove is provided on the outer wall of the input shaft 201 . The sliding block on the switching sleeve 210 is inserted into the axial groove in an axially sliding manner.

[0107] Two groups of protrusions are arranged at the proximal and distal ends of the switching sleeve 210, each group of protrusions includes a plurality of protrusions 2108 arranged circumferentially at intervals, a plurality of first grooves 2043 capable of engaging with the plurality of protrusions 2108 in one group are provided on the output sleeve 204, an output shaft sleeve 217 is sleeved on the proximal end of the output shaft 207, and a plurality of second grooves 2171 capable of engaging with the plurality of protrusions 2108 in another group are provided at the proximal end of the output shaft sleeve 217.

[0108] When the switching sleeve 210 is located in the first switching position, the sliding block on the switching sleeve 210 is located near the axial groove, and the proximal protrusion 2108 of the switching sleeve 210 engages with the first groove 2043 of the output sleeve 204 to form a driving connection. At this time, the sliding block is located near the output shaft 207, and a group of protrusions on the distal side are located near the second groove 2171, so the switching sleeve 210 does not form a driving connection with the output shaft 207.

[0109] When the switching sleeve 210 is located in the second switching position, the sliding block on the switching sleeve 210 is located at the distal end of the axial groove, and the distal protrusion 2108 of the switching sleeve 210 engages with the second groove 2171 of the output shaft 207 to form a drive connection. At this time, the proximal protrusion 2108 is located at the distal end of the first groove of the output sleeve 204, so the switching sleeve 210 does not form a drive connection with the output sleeve 204.

[0110] Of course, the implementation of the meshing protrusion 2108 and the groove is not limited to the above, and the positions of the mating protrusion 2108 and the groove can be interchanged, or only one set of protrusions is retained to be successively connected with the first groove 2043 and the second groove 2171. The meshing protrusion and the groove may not be aligned, and the rotation angle of the motor can be set to ensure that the meshing protrusion and the groove can be aligned and engaged.

[0111] Example 4

[0112] On the basis of Example 3, one protrusion can be set in a group of protrusions, two arc-shaped first grooves are set on the circumference of the output sleeve 204, and two arc-shaped second grooves are set on the circumference of the output shaft 207, which is conducive to the smooth and effective engagement of the protrusion and the groove.

[0113] Example 5

[0114] On the basis of Embodiment 3, the output shaft sleeve 217 can be eliminated, and a second groove spaced circumferentially is provided on the proximal surface of the output shaft 207, and a bump is provided on the distal inner wall of the switching sleeve 210. Alternatively, a bump is provided on the proximal end of the output shaft 207, and a second groove spaced circumferentially is provided on the distal end of the switching sleeve 210.

[0115] In summary of the above-mentioned embodiments 3 to 5, the selectable power transmission between the switching sleeve 210 and the input shaft 201, the output sleeve 204 and the output shaft 207 can also be achieved by providing a concave-convex matching structure between the inner wall of the switching sleeve 210 and the outer wall of the input shaft 201, a concave-convex matching structure between the switching sleeve 210 and the output sleeve 204, and a concave-convex matching structure between the switching sleeve 210 and the output shaft 207, so that when the switching sleeve 210 is in the first switching position, the switching sleeve 210 and the input shaft 201 The concave-convex matching structure between the switching sleeve 210 and the output sleeve 204 is driven to connect, and the concave-convex matching structure between the switching sleeve 210 and the output shaft 207 is disengaged; when the switching sleeve 210 is in the second switching position, the concave-convex matching structure between the switching sleeve 210 and the input shaft 201 is driven to connect, the concave-convex matching structure between the switching sleeve 210 and the output shaft 207 is driven to connect, and the concave-convex matching structure between the switching sleeve 210 and the output sleeve 204 is disengaged. The above structure also makes the structure of the stapler simple, compact, low-cost, suitable for mass production, and the radial area of ​​the stapler is smaller, which is conducive to its grasping and use.

[0116] Of course, the structures for driving connection in embodiments 1-5 can be used in combination with each other and also fall within the protection scope of the present invention.

[0117] Example 6

[0118] Reference Fig.10Compared 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 which is connected to the closing nut 304, and the center of the nail magazine bracket 102 is hinged to the center of the cantilever. The nail magazine bracket 102 is fixed to the cantilever by a pin and can rotate around the pin. The center of the nail magazine bracket 102 coincides with the pin. When the nail magazine bracket 102 is closed, the force on both sides of the nail magazine bracket 102 is uneven, which will push the nail magazine bracket 102 to rotate until the force on the nail magazine bracket 102 is balanced.

[0119] Example 7

[0120] Reference Fig.11 , compared with Example 1, 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 in 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 104 (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 102 (for example, bolted), forming two connection positions. In this way, the nail magazine bracket 102 can be prevented from tilting or horizontally staggered relative to the nail anvil bracket 104 during the up and down movement.

[0121] Example 8

[0122] Reference Fig.12 , 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 109, each set of guide mechanisms 109 includes at least one slide rail and slider assembly, the slide rail 1091 is fixed on the nail anvil support 104, and the slider 1092 is fixed on the nail magazine support 102. If multiple slide rail and slider assemblies are provided, the multiple slide rail and slider assemblies are arranged in the axial direction. In this way, the nail magazine support 102 can also be prevented from tilting or horizontally staggered relative to the nail anvil support 104 during the up and down movement.

[0123] Example 9

[0124] 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 104, and the gear is fixed on the nail magazine support 102. 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 102 can also be prevented from tilting or horizontally staggered relative to the nail anvil support 104 during the up and down movement.

[0125] In summary, the parallel closing mechanism includes all structures that can promote the parallel closing of the nail magazine support 102 and the nail anvil support 104. Among them, as in Example 1, Example 7, Example 8, and Example 9, the parallel closing mechanism is preferably connected to the nail magazine support 102 and the nail anvil support 104 at the same time, so that the parallel closing mechanism and the closing drive mechanism 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 102 and the nail anvil support 104 respectively form multiple connection positions spaced along the axial direction, which is more conducive to the long-term effectiveness of parallel closing.

[0126] Example 10

[0127] In this embodiment, on the basis of the above embodiment, a spring can be sleeved on the input shaft 201 and the two ends of the spring can be fixed on the input shaft 201 and the switching sleeve 210, so that when the switching sleeve 210 moves from the first switching position to the second switching position, the spring is compressed or stretched to accumulate force, and then when it is necessary to move from the second switching position to the first switching position, the operator only needs to release the switching drive member.

[0128] In the case of a spring, the operator needs to continuously push the switching drive member when the switching sleeve 210 is in the second switching position. Therefore, the groove through which the switching drive member passes in the main housing of the stapler can be set to include an axial groove and a lateral groove perpendicular to the axial groove. The bidirectional movement of the switching drive member along the axial groove drives the switching sleeve 210 to move between the first switching position and the second switching position. When the switching sleeve 210 is in the second switching position, the switching drive member can be rotated into the lateral groove, thereby locking the switching drive member, that is, locking the switching sleeve 210. The operator can release the switching drive member and ensure that the switching sleeve 210 is continuously located in a position driven and connected to the output shaft.

[0129] 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 stapler, comprising a staple cartridge support (102), a staple anvil support (104) and a firing screw (105), characterized in that: It also includes a parallel closing mechanism, an input shaft (201), an output sleeve (204), an output shaft (207), and a switching sleeve (210), wherein the input shaft (201), the output shaft (207), the output sleeve (204), and the switching sleeve (210) are coaxial; The parallel closing mechanism is connected to the nail magazine support (102) or is connected to the nail magazine support (102) and the nail anvil support (104) simultaneously in a manner that the nail magazine support (102) and the nail anvil support (104) are parallel when opened and closed; The output sleeve (204) is rotatably sleeved on the outside of the input shaft (201), and the output sleeve (204) is connected to the nail magazine support (102) in a manner such that the rotation of the output sleeve (204) is converted into an up-and-down movement of the nail magazine support (102); The output shaft (207) is rotatable and arranged on one axial side of the input shaft (201), and the output shaft (207) is connected to the firing screw (105) in such a way that the rotation of the output shaft (207) is converted into the rotation of the firing screw (105); The switching sleeve (210) is sleeved on the outside of the input shaft (201), and the switching sleeve (210) is connected to the input shaft (201) in a manner that the switching sleeve (210) can be driven to rotate and the switching sleeve (210) can be axially moved between a first switching position and a second switching position; when the switching sleeve (210) is located at the first switching position and the second switching position, the switching sleeve (210) and the input shaft (201) are drivingly connected; When the switching sleeve (210) is located at the first switching position, the switching sleeve (210) is connected to the output sleeve (204) in a driving rotation manner, and the switching sleeve (210) is separated from the output shaft (207); When the switching sleeve (210) is located at the second switching position, the switching sleeve (210) is separated from the output sleeve (204), and the switching sleeve (210) is connected to the output shaft (207) in a driving rotation manner.

2. The stapler according to claim 1, characterized in that: The switching sleeve (210) is located at the far side of the output sleeve (204).

3. The stapler according to claim 1, characterized in that: The output shaft (207) is located on the far side of the input shaft (201).

4. The stapler according to claim 1, characterized in that: The output shaft (207) is axially spaced from the input shaft (201).

5. The stapler according to claim 1, characterized in that: The stapler further comprises a switching drive member (213), wherein the switching drive member (213) is connected to the switching sleeve (210) in a manner capable of relative rotation and capable of driving axial movement.

6. The stapler according to claim 1, characterized in that: The switching sleeve (210) is sleeved outside the input shaft (201) and the output shaft (207) in both the first switching position and the second switching position.

7. The stapler according to claim 1, characterized in that: The parallel closing mechanism and the nail magazine support (102) and the nail anvil support (104) respectively form a plurality of connection positions spaced apart along the axial direction.

8. The stapler according to claim 7, characterized in that: The parallel closing mechanism comprises two groups of link mechanisms (107), each group of link mechanisms (107) comprises a first link (1071) and a second link (1072) which are hinged to each other, the first link (1071) and the second link (1072) being of equal length, and a hinge point between the two being located at the length center of the two.

9. The stapler according to claim 8, characterized in that: One end of the first connecting rod (1071) in the two sets of connecting rod mechanisms (107) is respectively hinged to the nail anvil support (104) through two connecting pins, 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 (102) through the same connecting pin; One end of the second connecting rod (1072) in the two sets of connecting rod mechanisms (107) is hinged to the nail magazine support (102) through the same connecting pin, 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 (104) through the same connecting pin; The position where the first connecting rod (1071) is connected to the anvil support (104) is located at the far side of the position where the second connecting rod (1072) is connected to the anvil support (104).

10. The stapler according to claim 8, characterized in that: One end of the first connecting rod (1071) in the two sets of connecting rod mechanisms (107) is rotatably and slidably connected to the anvil support (104) through two connecting pins, and the other end of the first connecting rod (1071) in the two sets of connecting rod mechanisms (107) is hinged to the nail magazine support (102) through the same connecting pin; One end of the second connecting rod (1072) in the two sets of connecting rod mechanisms (107) is rotatably and slidably connected to the nail magazine support (102) through the same connecting pin, and the other end of the second connecting rod (1072) in the two sets of connecting rod mechanisms (107) is hinged to the nail anvil support (104) through the same connecting pin; The position where the first connecting rod (1071) is connected to the anvil support (104) is located at the far side of the position where the second connecting rod (1072) is connected to the anvil support (104).

11. The stapler according to claim 1, characterized in that: The input shaft (201) is connected to a switching slider (211) that is axially and radially movable, the switching slider (211) being connected to the switching sleeve (210) in such a manner that they can move axially together and rotate together around the axis of the input shaft (201), and at least one of the two radial ends of the switching slider (211) protrudes outside the input shaft (201); A driving block (2041) is provided on the hole wall of the output sleeve (204); When the switching sleeve (210) is located at the first switching position, the switching slider (211) corresponds to the driving block (2041) in the circumferential direction; When the switching sleeve (210) is located at the second switching position, the switching slider (211) and the driving block (2041) are offset.

12. The stapler according to claim 11, characterized in that: The switching sleeve (210) is located at the far side of the output sleeve (204), the proximal end of the switching slider (211) is gradually reduced, and the inner wall of the far end of the driving block (2041) is inclined backwards and outwards to form an inclined surface.

13. The stapler according to claim 11, characterized in that: At least two driving blocks (2041) are provided which are spaced apart in the circumferential direction, and any two of the driving blocks (2041) are staggered relative to the diameter.

14. The stapler according to claim 11, characterized in that: A stopper (2102) is provided on the inner wall of the distal end of the switching sleeve (210); A radially movable transmission slider (212) is provided on the output shaft (207), and at least one of two radial ends of the transmission slider (212) protrudes to the outside of the output shaft (207); When the switching sleeve (210) is located at the first switching position, the stopper (2102) and the transmission slider (212) are offset; When the switching sleeve (210) is located at the second switching position, the stopper (2102) corresponds to the transmission slider (212) in the circumferential direction.

15. The stapler according to claim 14, characterized in that: At least two axially spaced stoppers (2102) are provided, and any two of the stoppers (2102) are staggered along the diameter.

16. The stapler according to claim 14, characterized in that: The output shaft (207) is located on the far side of the input shaft (201); The inner wall of the distal end of the stopper (2102) is inclined backward and outward to form an inclined surface; The proximal end of the transmission slider (212) tapers.

17. The stapler according to claim 1, characterized in that: A concave-convex matching structure is provided between the switching sleeve (210) and the input shaft (201).

18. The stapler according to claim 1, characterized in that: A concave-convex matching structure is provided between the switching sleeve (210) and the input shaft (201); when the switching sleeve (210) is located at the first switching position, the concave-convex matching structure between the switching sleeve (210) and the output shaft (207) is disengaged; when the switching sleeve (210) is located at the second switching position, the concave-convex matching structure between the switching sleeve (210) and the output shaft (207) is drivingly connected.

19. The stapler according to claim 1, characterized in that: A concave-convex matching structure is provided between the switching sleeve (210) and the output sleeve (204); when the switching sleeve (210) is located at the first switching position, the concave-convex matching structure between the switching sleeve (210) and the output sleeve (204) is drivingly connected; when the switching sleeve (210) is located at the second switching position, the concave-convex matching structure between the switching sleeve (210) and the output sleeve (204) is disengaged.

20. The stapler according to claim 1, characterized in that: A first engaging member is provided on the switching sleeve (210), and a second engaging member is provided on the output sleeve (204); At least a plurality of third engaging members spaced apart in the axial direction are provided on the switching sleeve (210), at least a plurality of fourth engaging members spaced apart in the axial direction are provided on the input shaft (201), and a fifth engaging member is provided on the output shaft (207); When the switching sleeve (210) is located at the first switching position, the first engaging member and the second engaging member are drivingly connected, the third engaging member and the fourth engaging member are drivingly connected, and the third engaging member and the fifth engaging member are axially separated; When the switching sleeve (210) is located at the second switching position, the proximal third engaging member is drivingly connected to the fourth engaging member, the distal third engaging member is drivingly connected to the fifth engaging member, and the first engaging member and the second engaging member are axially separated.

21. The stapler according to claim 20, characterized in that: One of the first engaging member and the second engaging member is an arched spring buckle, and the other is an arched engaging groove; one of the third engaging member and the fourth engaging member is an arched spring buckle, and the other is an arched engaging groove; the fifth engaging member is the same as the fourth engaging member.

22. The stapler according to claim 1, characterized in that: It also includes a first bevel gear (301), a second bevel gear (302), a closing screw (303) and a closing nut (304); The first bevel gear (301) is fixedly sleeved on the outside of the output sleeve (204), the second bevel gear (302) is meshed with the first bevel gear (301), the closing screw (303) is fixedly connected to the second bevel gear (302), the closing nut (304) is screwed on the closing screw (303), and the nail magazine bracket (102) is provided with a mounting hole for sleeve-fitting the closing nut (304).

23. The stapler according to claim 5, characterized in that: An annular groove or an annular protrusion (2103) is provided on the outer wall of the switching sleeve (210); The switching drive member (213) comprises a toggle member (2132) and an engaging piece (2131), wherein the engaging piece (2131) has a groove end matching the shape of the annular groove or the annular protrusion (2103), and the groove end is plug-inly connected to the annular groove or the annular protrusion (2103) so as to be relatively rotatable.

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