Power switching mechanism and stapler

Abstract

The present invention belongs to the technical field of medical devices, and more particularly, relates to a power switching mechanism for a stapler and a stapler. In the power switching mechanism, an output sleeve is rotatably sleeved on the outside of an input shaft, the output shaft is rotatably and coaxially arranged on the rear side of the input shaft, a 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. When the switching sleeve is in a first switching position, the switching sleeve is connected to the output sleeve in a driving rotation manner, and the switching sleeve is separated from the output shaft. When the switching sleeve is in a second switching position, the switching sleeve is separated from the output sleeve, and the switching sleeve is connected to the output shaft in a driving rotation manner. In the stapler, the output sleeve is connected to the staple magazine bracket, and the output shaft is connected to the firing screw. The power switching mechanism of the present invention and the stapler having the power switching mechanism are simple in structure, compact, low in cost, and suitable for mass production.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and in particular relates to a power switching mechanism and an anastomosis device. 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 an open 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] In order to avoid the instability and inconvenience of manual closing and manual firing, the current staplers have adopted electric drive to complete the driving of the two movements of closing and firing. In order to reduce the cost and size of the stapler, the use of a single motor is a better choice. How to make a motor drive the two movements of closing and firing successively through a power switching mechanism and make the power switching mechanism simpler in structure is a technical problem that needs to be solved in this field. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the existing technical problems, the present invention provides a power switching mechanism with a simple structure and a stapler having the power switching mechanism.

[0006] (II) Technical solution

[0007] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0008] The present invention provides a power switching mechanism, comprising an input shaft, an output sleeve, an output shaft and a switching sleeve; the output sleeve is rotatably sleeved on the outside of the input shaft; the output shaft is rotatable and arranged on one axial side of the input shaft; the switching sleeve is sleeved on the outside of the input shaft and connected thereto, the input shaft can drive the switching sleeve to rotate and the switching sleeve can move axially between a first switching position and a second switching position; when the switching sleeve is located at the first switching position, the switching sleeve is connected to the output sleeve, the switching sleeve can drive the output sleeve to rotate, and the switching sleeve is separated from the output shaft; when the switching sleeve is located at the second switching position, the switching sleeve is separated from the output sleeve, the switching sleeve is connected to the output shaft, and the switching sleeve can drive the output shaft to rotate.

[0009] Preferably, the input shaft, the output sleeve, the output shaft and the switching sleeve are coaxial.

[0010] Preferably, the switching sleeve is located on one axial side of the output sleeve.

[0011] Preferably, the switching sleeve is located at the rear side of the output sleeve, and the output shaft is located at the rear side of the input shaft.

[0012] Preferably, the output shaft is axially spaced from the input shaft.

[0013] 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.

[0014] Preferably, the power switching mechanism further comprises a switching drive member, which is connected to the switching sleeve, and the switching drive member can rotate relative to the switching sleeve and can drive the switching sleeve to move axially.

[0015] Preferably, an annular groove or an annular protrusion is provided on the outer wall of the switching sleeve; the switching drive member includes a connected toggle member and an engaging plate, the engaging 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.

[0016] Preferably, an axially movable switching slider is connected to the input shaft, and the switching slider is connected to the switching sleeve. The switching slider and the switching sleeve can move axially together and rotate around the axis of the input shaft together; 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.

[0017] Preferably, at least two drive blocks are provided, and any two drive blocks are staggered with respect to the diameter.

[0018] Preferably, a strip groove is provided on the input shaft, the length direction of the strip groove is parallel to the axial direction of the input shaft, the switching slider is radially movable through the strip groove, and at least one of the radial ends of the switching slider protrudes to the outside of the strip groove.

[0019] Preferably, a strip hole is provided on the switching slider, the length direction of the strip hole is along the radial direction of the input shaft, two strip grooves are provided on the opposite side walls of the input shaft, the length direction of the strip grooves is along the axial direction of the input shaft, two supporting holes are provided on the opposite side walls of the switching sleeve, and a rod body passes through the strip hole, the strip groove and the supporting hole.

[0020] Preferably, the switching sleeve is located at the rear side of the output sleeve, the front end of the switching slider is gradually reduced, and the rear end inner wall of the driving block is inclined backward and outward to form an inclined surface.

[0021] Preferably, a stopper is arranged on the inner wall of the switching sleeve; a radially movable transmission slider is arranged on the output shaft; when the switching sleeve is in the first switching position, the stopper is staggered with the transmission slider; when the switching sleeve is in the second switching position, the stopper corresponds to the transmission slider in the circumferential direction.

[0022] Preferably, at least two circumferentially spaced stoppers are provided, and any two stoppers are staggered along the diameter.

[0023] Preferably, a radially penetrating slide groove is provided on the output shaft, and the transmission slider is supported in the slide groove so as to be movable in the radial direction of the output shaft, and at least one of the two radial ends of the transmission slider protrudes to the outside of the slide groove.

[0024] Preferably, the output shaft is located at the rear side of the input shaft, the front end of the transmission slider is gradually reduced, and the inner wall of the rear end of the stopper is inclined backward and outward to form an inclined surface.

[0025] Preferably, a strip hole is provided on the transmission slide block, the length direction of the strip hole is along the radial direction of the output shaft, and the transmission slide block is supported on the output shaft through a rod passing through the strip hole.

[0026] 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 drivingly connected.

[0027] 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 is driven to be connected. When the switching sleeve is located at the second switching position, the concave-convex matching structure between the switching sleeve and the output sleeve is disengaged.

[0028] Preferably, a concave-convex matching structure is arranged between the switching sleeve and the output 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, matching arched snaps and arched engagement holes are 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 arched snaps and arched engagement holes between the switching sleeve and the input shaft are engaged.

[0030] Preferably, matching arch spring buckles and arch engaging holes are provided between the switching sleeve and the output sleeve. When the switching sleeve is located at the first switching position, the arch spring buckles and arch engaging holes between the switching sleeve and the output sleeve are engaged. When the switching sleeve is located at the second switching position, the arch spring buckles and arch engaging holes between the switching sleeve and the output sleeve are disengaged.

[0031] Preferably, matching arch spring buckles and arch engaging holes are provided between the switching sleeve and the output shaft. When the switching sleeve is located at the first switching position, the arch spring buckles and arch engaging holes between the switching sleeve and the output shaft are disengaged. When the switching sleeve is located at the second switching position, the arch spring buckles and arch engaging holes between the switching sleeve and the output shaft are engaged.

[0032] Preferably, the length direction of the rectangular flat surface of the arched spring buckle is along the axial direction, and the diameter direction of the arched engagement hole is parallel to the axial direction.

[0033] On the other hand, the present invention provides a stapler, including a staple magazine mechanism, which includes a staple magazine support and a firing screw, and also includes any of the above-mentioned power switching mechanisms; one of the output sleeve and the output shaft is connected to the staple magazine support in a manner such that its rotation is converted into up and down movement of the staple magazine support; the other of the output sleeve and the output shaft is connected to the firing screw in a manner such that the rotation of the output sleeve is converted into rotation of the firing screw.

[0034] (III) Beneficial effects

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

[0036] The present invention arranges the input shaft, the output shaft, the output sleeve and the switching sleeve along an axis and realizes the selective driving connection with the output sleeve and the output shaft by the axial movement of the switching sleeve, so that the rotation of the input shaft can be selectively provided to the output sleeve and the output shaft, and the structure is simple, compact, low-cost and suitable for mass production. The power switching mechanism used in the stapler occupies less radial space, which is convenient for its grasping and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is an exploded schematic diagram of the stapler provided in Example 1, wherein the handle of the stapler is not shown;

[0038] Figure 2 It is an exploded schematic diagram of the stapler magazine mechanism of the stapler in Example 1;

[0039] Figure 3 is an exploded schematic diagram of the power switching mechanism of the stapler in Example 1;

[0040] 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;

[0041] 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;

[0042] Figure 6is a partial front cross-sectional schematic diagram of the stapler of Example 2 when the switching sleeve is located at the first switching position;

[0043] Figure 7 for Figure 6 A partial front cross-sectional schematic diagram of the stapler when the switching sleeve is located at the second switching position;

[0044] Figure 8 is a partial front cross-sectional schematic diagram of the stapler of Example 3 when the switching sleeve is located at the first switching position;

[0045] Fig. 9 for Figure 8 A partial front cross-sectional schematic diagram of the stapler when the switching sleeve is in the second switching position.

[0046] [Description of Reference Numerals]

[0047] 1: nail magazine mechanism; 101: nail magazine; 102: nail magazine bracket; 103: nail anvil; 104: nail anvil bracket; 105: firing screw; 106: firing nut; 1061: blade; 1062: nail pushing block;

[0048] 2: power switching mechanism; 201: input shaft; 2011: first input shaft segment; 2012: second input shaft segment; 2013: third input shaft segment; 2014: annular protrusion; 2015: strip-shaped slide groove; 2016: strip-shaped groove; 2018: second arched engagement hole;

[0049] 202: input shaft bearing; 203: input shaft bearing seat; 2031: annular step; 2032: annular rib; 204: output sleeve; 2041: driving block; 2042: first arched engagement hole; 2043: first groove; 205: output sleeve sleeve; 206: output sleeve seat; 207: output shaft; 2071: first output shaft section; 2072: second output shaft section; 2073: third output shaft section; 2074: slide groove; 2075: support hole; 2076: step surface; 2077: axial plug hole; 2078: third arched engagement hole;

[0050] 208: output shaft bearing; 209: output shaft bearing seat; 210: switching sleeve; 2101: slot; 2102: stopper; 2103: annular protrusion; 2104: first mounting hole; 2105: first arch spring buckle; 2106: second mounting hole; 2107: second arch spring buckle; 2108: bump;

[0051] 211: switching slider; 2111: bar hole; 212: transmission slider; 2121: bar hole; 213: switching driving member; 2131: engaging piece; 2132: toggle member; 214: retaining ring; 215: rod body; 216: rod; 217: output shaft sleeve; 2171: second groove;

[0052] 3: Transmission mechanism; 301: First bevel gear; 302: Second bevel gear; 303: Closing screw; 304: Closing nut. DETAILED DESCRIPTION

[0053] 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. The side closer to the doctor during use is referred to as "near", the side closer to the patient is referred to as "far", and the direction from "near" to "far" is referred to as the direction from "front" to "back".

[0054] Example 1

[0055] Reference Figures 1 to 3 This embodiment provides a stapler, which includes a stapler mechanism 1 , a transmission mechanism 3 , a power source and a power switching mechanism 2 .

[0056] 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, the nail anvil 103 and the firing screw 105 are supported on the nail anvil support 104, and 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. The nail pushing block 1062 on the firing nut 106 is used to push the slider in the nail magazine 101 to complete the formation of the U-shaped staples, and the blade 1061 on the firing nut 106 is used to cut the tissue and finally complete the firing action. The other structures of the nail magazine mechanism 1 are prior art and will not be repeated here.

[0057] The power source is a device that provides rotational power, and a motor is generally selected.

[0058] The power switching 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.

[0059] Specifically, the power switching 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.

[0060] 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.

[0061] 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, and the retaining ring 214 is fixed on the input shaft bearing seat 203. One input shaft bearing 202 is supported on the input shaft bearing seat 203, and 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, and the input shaft bearing 202 is axially limited between the retaining ring 214 and the annular protrusion 2014 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 retaining edge 2032 is provided on the inner wall of the rear end of the first input shaft bearing seat 203, and the other input shaft bearing 202 is axially limited between the transition surface and the retaining edge.

[0062] 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.

[0063] 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. At the same time, two strip-shaped grooves 2016 are provided on the opposite side walls of the third input shaft segment 2013, that is, 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. In this embodiment, the strip-shaped slide groove 2015 is located at the rear of the input shaft.

[0064] 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 hangs 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 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.

[0065] The output shaft 207 is arranged at the rear 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. Of course, the output shaft 207 can be arranged at any axial side of the input shaft 201, and the positions of related transmission components are set accordingly.

[0066] Specifically, in this embodiment, 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 connected in sequence from near to far and are coaxial. 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.

[0067] A radially penetrating groove 2074 is provided on the first output shaft segment 2071, that is, the front part of the output shaft 207, and a strip hole 2121 is provided on the transmission slider 212. The length direction of the strip hole 2121 is along the radial direction of the output shaft 207. Support holes 2075 are provided on both sides of the output shaft 207 symmetrically along the groove 2074. A rod 216 passes through the strip hole 2121, and the two ends of the rod 216 are supported on the two support holes 2075. Thus, the transmission slider 212 can be supported in the slide groove 2074 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 2074, that is, when the transmission slider 212 rotates to a 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 2074. Of course, in this embodiment, both radial ends of the transmission slider 212 protrude to the outside of the slide groove 2074 to ensure smooth driving connection. The proximal end of the transmission slider 212 is gradually reduced to form two inclined surfaces.

[0068] The output shaft bearing 208 is supported in the output shaft bearing seat 209, and 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, and the output shaft bearing 208 is interference-fitted with the output shaft bearing seat 209. The output shaft 207 is supported in the output shaft bearing 208, thereby forming a bidirectionally rotatable arrangement.

[0069] 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 rear 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.

[0070] The output sleeve 204 is sleeved on the outside of the input shaft 201 in a bidirectionally rotatable manner but is spaced from the input shaft 201, i.e., it is not in direct contact with the input shaft 201. A sleeve or a bearing is sleeved on the outside of the output sleeve 204, and the sleeve or the bearing is supported in the output sleeve seat 206, and the axis of the output sleeve 204 coincides with the axis of the input shaft 201. Thus, the output sleeve 204 is arranged to be bidirectionally rotatable. In this embodiment, the output sleeve seat 206 is located at the rear side of the input shaft bearing seat 203 and at the front side of the output shaft bearing seat 209. The function of the output sleeve 204 is to output the bidirectional 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.

[0071] 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 closing nut 304 is fixedly connected to the nail magazine support 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 nail magazine support 102 in a manner that the bidirectional rotation of the output sleeve 204 is converted into the up and down movement of the nail magazine 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. Therefore, in this embodiment, the first bevel gear 301 is always meshed with the second bevel gear 302, avoiding the problem of large force on the first bevel gear 301 during the separation and meshing process relative to the second bevel gear 302. Of course, in other embodiments, according to the inspiration given in this embodiment, the output shaft 207 and the nail magazine bracket 102 are connected in a manner that the bidirectional rotation thereof is converted into the up and down movement of the nail magazine bracket 102, and the output sleeve 204 and the firing screw 105 are connected in a manner that the bidirectional rotation of the output sleeve 204 is converted into the bidirectional rotation of the firing screw 105.

[0072] Three driving blocks 2041 are provided on the rear end hole wall of the output sleeve 204. Any two driving blocks 2041 are staggered relative to the diameter. The rear end inner wall of the driving block 2041 is tilted backward and outward to form an inclined surface. 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.

[0073] 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 rear 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 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.

[0074] Two supporting holes are provided on the proximal opposite side walls of the switching sleeve 210 (i.e., the two sides opposite to the strip groove 2015), and the two ends of the rod body for supporting the switching slider 211 pass through the two supporting holes respectively, 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 member passes through the strip groove 2016 on the input shaft 201 and the supporting holes on the switching sleeve 210 at the same time, 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 at the front side of the second switching position, i.e., the proximal side), 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 rear 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. The inner wall at the rear 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 rear 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 and pull of the two (described in detail later). In other embodiments, the number of blocks 2102 is not limited to three, and may also be two or more than three. When two blocks 2102 are provided, the idling stroke will be larger. Considering various parameters such as the idling stroke and product size, three blocks 2102 are a better choice.

[0075] like Figure 4 As shown, when the switching sleeve 210 is located at the first switching position:

[0076] 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.

[0077] At the same time, the stopper 2102 on the switching sleeve 210 is located in front of 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.

[0078] 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 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.

[0079] like Figure 5 As shown, when the switching sleeve 210 is located at the second switching position:

[0080] The switching slider 211 is located at the rear 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.

[0081] 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 correspondence with each other with a spacing. 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 driving rotation manner.

[0082] 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.

[0083] 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 rear 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 housing of the stapler for the operator to toggle. The toggle member 2132 is a rod.

[0084] In summary, the actions of the power switching mechanism in this embodiment are as follows:

[0085] first step:

[0086] When the toggle member 2132 is located at the front limit position (the front limit position may be limited by the strip groove or the toggle member 2132 by the stapler housing), 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 the circumferential direction, and the switching sleeve 210 and the output sleeve 204 are in a state of driving rotation connection. At the same time, the stopper 2102 of the switching sleeve 210 is located in front 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, and the switching slider 211 drives the output sleeve 204 to rotate, and then drives the nail magazine bracket 102 to move downward through the transmission mechanism 3, and 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.

[0087] Step 2:

[0088] To stop the operation of the motor, the operator drives the toggle member 2132 toward the rear side to the extreme position, driving the switching sleeve 210 to move toward the second switching position. The switching slider 211 moves with 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.

[0089] Step 3:

[0090] Start the motor, the rotation of the input shaft 201 drives the rod body 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.

[0091] Step 4:

[0092] When the firing is to be released, the driving motor rotates in the opposite direction (opposite to the third step), the input shaft 201 rotates in the opposite direction (opposite to the third step), the switching sleeve 210 rotates in the opposite direction (opposite to the third step), the output shaft 207 rotates in the opposite direction (opposite to the third step), the firing screw 105 rotates in the opposite direction (opposite to the third step), and the firing nut 106 moves forward to return to the original position. Then the motor is stopped, 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 and the driving block 2041 form a circumferential correspondence, and the stopper 2102 is disengaged from the transmission slider 212.

[0093] Step 5:

[0094] The driving motor rotates in the reverse direction (in the opposite direction of the first step), the input shaft 201 rotates in the reverse direction (in the opposite direction of the first step), the switching sleeve 210 rotates in the reverse direction (in the opposite direction of the first step), and the output sleeve 204 rotates in the reverse direction (in the opposite direction of the first step), thereby driving the closing nut 304 to move upward through the transmission mechanism 3, and the nail magazine bracket 102 moves upward and returns to the open state.

[0095] In summary, in this embodiment, 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 simple, compact, low-cost, and suitable for mass production. The power switching mechanism 2 used in the stapler occupies a smaller radial area, which is convenient for its grasping and use.

[0096] The purpose of setting the above-mentioned switching slider 211 / transmission slider 212 and 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 212 and the stopper 2102 can be interchanged, the front end of the output shaft is set as a sleeve and the stopper 2102 is set on its inner wall, and the shaft is set at the rear end of the switching sleeve and the transmission slider is fixed in the groove on the shaft so that it can move radially in both directions, which can also achieve the above purpose, 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 / stopper 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.

[0097] Furthermore, the output shaft and the firing screw are coaxial and directly connected, which also makes the axial structure of the stapler more compact and the radial volume smaller.

[0098] In summary, the power switching mechanism in this embodiment is used for a stapler, but the power switching mechanism of the present invention is not limited thereto and can also be used in other medical devices or even other small electrical appliances.

[0099] Example 2

[0100] 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.

[0101] 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 .

[0102] The switching sleeve 210 is provided with a plurality of first mounting holes 2104 evenly spaced along the circumferential direction, and a first arch spring buckle 2105 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, the inner wall of the output sleeve 204 is provided with a plurality of first arch engaging holes 2042 arranged along the circumferential direction, and the number of the first arch engaging holes 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 hole 2042. The first arch spring buckle 2105 may have been engaged with the first arch engagement hole 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 hole 2042 in the circumferential direction. However, when the switching sleeve 210 rotates a certain angle, the first arch spring buckle 2105 naturally bounces into the first arch engagement hole 2042, and the switching sleeve 210 forms a driving connection with the output sleeve 204.

[0103] The switching sleeve 210 is provided with at least two groups of second mounting holes 2106 arranged at intervals along the axial direction thereof, each group of second mounting holes 2106 includes a plurality of second mounting holes 2106 evenly spaced along the circumferential direction, and a second arch spring buckle 2107 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 inside of the second mounting hole 2106 when pressed down. Correspondingly, at least two groups of second arch engaging holes 2018 are arranged at intervals along the axial direction thereof on the outer wall of the input shaft 201, each group of second arch engaging holes 2018 includes a plurality of second arch engaging holes 2018 evenly spaced along the circumferential direction, the number of second arch engaging holes 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 arch engaging holes 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 engagement holes 2018. The second arch spring buckles 2107 may have been engaged with the second arch engagement holes 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 engagement hole 2018 in the circumferential direction. However, when the input shaft 201 rotates a certain angle, the second arch spring buckles 2107 naturally pop into the second arch engagement hole 2018, and the switching sleeve 210 forms a driving connection with the input shaft 201.

[0104] A plurality of third arched engagement holes 2078 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 holes 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 holes 2078 are located at the rear side of the second arched snaps 2107. When the switching sleeve 210 is located at the second switching position, the last group of second arched snaps 2107 on the switching sleeve 210 engage with the third arched engagement holes 2078, or the third arched snaps are pressed against the outer wall of the output shaft 207 and have a certain distance from the third arched engagement holes 2078 in the circumferential direction, but when the switching sleeve 210 rotates a certain angle, the last group of second arched snaps 2107 naturally snap into the third arched engagement holes 2078, and the switching sleeve 210 forms a driving connection with the output shaft 207. At this time, the frontmost group of second arched snap buckles 2107 on the switching sleeve 210 are engaged with the front second group of second arched engagement holes 2018 on the input shaft 201 .

[0105] 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 hole 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 hole 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 to facilitate the application of 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.

[0106] Of course, there are many other variant embodiments of the design concept of the arch spring buckle and the arch engaging hole of this embodiment. For example, the positions of any of the above-mentioned sets of cooperating arch spring buckles-arch engaging holes 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 hole 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 third arch engaging hole 2078 and the second arch engaging hole 2018 are correspondingly arranged on the switching sleeve 210.

[0107] 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.

[0108] Example 3

[0109] 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.

[0110] 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.

[0111] Two groups of protrusions are arranged on the front and rear sides of the switching sleeve 210, each group of protrusions includes a plurality of protrusions 2108 arranged circumferentially spaced apart, 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.

[0112] When the switching sleeve 210 is located at the first switching position, the sliding block on the switching sleeve 210 is located at the front part of the axial groove, and the front side 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 at the front side of the output shaft 207, and a group of protrusions on the rear side are located at the front side of the second groove 2171, so the switching sleeve 210 does not form a driving connection with the output shaft 207.

[0113] When the switching sleeve 210 is located at the second switching position, the sliding block on the switching sleeve 210 is located at the rear of the axial groove, and the protrusion 2108 on the rear side of the switching sleeve 210 engages with the second groove 2171 of the output shaft 207 to form a driving connection; at this time, the protrusion 2108 on the front side is located at the rear side of the first groove 2043 of the output sleeve 204, so the switching sleeve 210 does not form a driving connection with the output sleeve 204.

[0114] Of course, the implementation of the meshing protrusions and grooves is not limited to the above, and the positions of the mating protrusions 2108 and grooves 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 protrusions and grooves may not be aligned, and the meshing protrusions and grooves can be aligned and engaged by setting the rotation angle of the motor.

[0115] Example 4

[0116] On the basis of Example 3, a protrusion 2108 can be set in a group of protrusions, two arc-shaped first grooves 2043 are set on the circumference of the output sleeve 204, and two arc-shaped second grooves 2171 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.

[0117] Example 5

[0118] Based on the third embodiment, the output shaft sleeve 217 can be eliminated, and the front end surface of the output shaft 207 can be provided with circumferentially spaced second grooves 2171. Alternatively, a protrusion 2108 can be provided at the front end of the output shaft 207, and circumferentially spaced second grooves 2171 can be provided at the rear end of the switching sleeve 210.

[0119] 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 be connected, and 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 input shaft 201 is driven to be connected, the concave-convex matching structure between the switching sleeve 210 and the output shaft 207 is driven to be connected, and the concave-convex matching structure between the switching sleeve 210 and the output sleeve 204 is disengaged, so as to achieve the above structure. The structure also makes the structure of the anastomosis device simple, compact, low-cost, suitable for mass production, and the radial space occupied in the anastomosis device is smaller, which is conducive to its grasping and use. Of course, the structures for driving connection in Examples 1-5 can be used in combination with each other, which also falls within the protection scope of the present invention.

[0120] Example 6

[0121] 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.

[0122] 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 power switching mechanism of a stapler, characterized in that: It comprises an input shaft (201), an output sleeve (204), an output shaft (207) and a switching sleeve (210); The output sleeve (204) is connected to the stapler magazine support (102) in such a way that the rotation of the output sleeve (204) is converted into the up and down movement of the stapler magazine support (102); The output shaft (207) is connected to the firing screw (105) of the stapler in a manner that converts the output shaft (207) into rotation of the firing screw (105); The output sleeve (204) is rotatably sleeved on the outside of the input shaft (201); The output shaft (207) is rotatable and arranged on one axial side of the input shaft (201); The switching sleeve (210) is sleeved on the outside of the input shaft (201) and connected thereto; the input shaft (201) can drive the switching sleeve (210) to rotate and the switching sleeve (210) can move axially 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 both 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), the switching sleeve (210) can drive the output sleeve (204) to rotate, 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), the switching sleeve (210) is connected to the output shaft (207), and the switching sleeve (210) can drive the output shaft (207) to rotate; The input shaft (201), the output sleeve (204), the output shaft (207) and the switching sleeve (210) are coaxial.

2. The power switching mechanism of the stapler according to claim 1, characterized in that: The switching sleeve (210) is located at the rear side of the output sleeve (204), and the output shaft (207) is located at the rear side of the input shaft (201).

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

4. The power switching mechanism of 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.

5. The power switching mechanism of the stapler according to claim 1, characterized in that: The power switching mechanism further comprises a switching drive member (213), wherein the switching drive member (213) is connected to the switching sleeve (210), and the switching drive member (213) is capable of rotating relative to the switching sleeve (210) and of driving the switching sleeve (210) to move axially.

6. The power switching mechanism of 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) connected to each other, wherein the engaging piece (2131) has a groove end matching the shape of the annular groove or the annular protrusion, and the groove end is plug-inly connected to the annular groove or the annular protrusion so as to be relatively rotatable.

7. The power switching mechanism of the stapler according to claim 1, characterized in that: An axially movable switching slider (211) is connected to the input shaft (201), the switching slider (211) is connected to the switching sleeve (210), and the switching slider (211) and the switching sleeve (210) are capable of axially moving together and rotating together around the axis of 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.

8. The power switching mechanism of the stapler according to claim 7, characterized in that: At least two of the driving blocks (2041) are provided, and any two of the driving blocks (2041) are staggered relative to the diameter.

9. The power switching mechanism of the stapler according to claim 7, characterized in that: The input shaft (201) is provided with a strip slide groove (2015), the length direction of the strip slide groove (2015) is parallel to the axial direction of the input shaft (201), the switching slider (211) is radially movable and penetrates the strip slide groove (2015), and at least one of the two radial ends of the switching slider (211) protrudes to the outside of the strip slide groove (2015).

10. The power switching mechanism of the stapler according to claim 9, characterized in that: The switching slider (211) is provided with a strip hole (2111), the length direction of the strip hole (2111) is along the radial direction of the input shaft (201), the opposite side walls of the input shaft (201) are provided with two strip grooves (2016), the length direction of the strip grooves (2016) is along the axial direction of the input shaft (201), the opposite side walls of the switching sleeve (210) are provided with two supporting holes, and a rod body (215) passes through the strip hole (2111), the strip grooves (2016) and the supporting holes.

11. The power switching mechanism of the stapler according to claim 7, characterized in that: The switching sleeve (210) is located at the rear side of the output sleeve (204), the front end of the switching slider (211) is gradually reduced, and the rear end inner wall of the driving block (2041) is inclined backwards and outwards to form an inclined surface.

12. The power switching mechanism of the stapler according to claim 1, characterized in that: A stopper (2102) is provided on the inner wall of the switching sleeve (210); The output shaft (207) is provided with a transmission slider (212) that can move radially; 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.

13. The power switching mechanism of the stapler according to claim 12, characterized in that: At least two circumferentially spaced stoppers (2102) are provided, and any two of the stoppers (2102) are staggered along the diameter.

14. The power switching mechanism of the stapler according to claim 12, characterized in that: The output shaft (207) is provided with a radially penetrating slide groove (2074), and the transmission slider (212) is supported in the slide groove (2074) so ​​as to be movable in the radial direction of 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 (2074).

15. The power switching mechanism of the stapler according to claim 14, characterized in that: The output shaft is located at the rear side of the input shaft, the front end of the transmission sliding block (212) is gradually reduced, and the inner wall of the rear end of the stopper is inclined backwards and outwards to form an inclined surface.

16. The power switching mechanism of the stapler according to claim 14, characterized in that: The transmission slider (212) is provided with a strip hole (2121), the length direction of the strip hole (2121) is along the radial direction of the output shaft (207), and the transmission slider (212) is supported on the output shaft (207) via a rod passing through the strip hole (2121).

17. The power switching mechanism of 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 power switching mechanism of 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.

19. The power switching mechanism of the stapler according to claim 1, characterized in that: A concave-convex matching structure is provided between the switching sleeve (210) and the output shaft (207); 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.

20. The power switching mechanism of the stapler according to claim 1, characterized in that: Matching arched spring buckles and arched engagement holes are provided between the switching sleeve (210) and the input shaft (201); when the switching sleeve (210) is located at the first switching position and the second switching position, the arched spring buckles and arched engagement holes between the switching sleeve (210) and the input shaft (201) are engaged.

21. The power switching mechanism of the stapler according to claim 1, characterized in that: Matching arched spring buckles and arched engagement holes are provided between the switching sleeve (210) and the output sleeve (204); when the switching sleeve (210) is located at the first switching position, the arched spring buckles and arched engagement holes between the switching sleeve (210) and the output sleeve (204) are engaged; when the switching sleeve (210) is located at the second switching position, the arched spring buckles and arched engagement holes between the switching sleeve (210) and the output sleeve (204) are disengaged.

22. The power switching mechanism of the stapler according to claim 1, characterized in that: Matching arched spring buckles and arched engagement holes are provided between the switching sleeve (210) and the output shaft (207); when the switching sleeve (210) is located at the first switching position, the arched spring buckles and arched engagement holes between the switching sleeve (210) and the output shaft (207) are disengaged; when the switching sleeve (210) is located at the second switching position, the arched spring buckles and arched engagement holes between the switching sleeve (210) and the output shaft (207) are engaged.

23. The power switching mechanism of the stapler according to any one of claims 20 to 22, characterized in that: The length direction of the rectangular flat surface of the arch spring buckle is along the axial direction, and the diameter direction of the arch engagement hole is parallel to the axial direction.

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