Power switching device and linear cutting stapler

Abstract

The present invention relates to the field of medical devices, and in particular to a power switching device and a linear cutting stapler. The power switching device includes a rotation input shaft, a first rotation output member, a second rotation output member, a switching member and a switching power input member. When the switching member is in the first position, the first rotation output member is drivingly connected to its downstream power transmission member, and the switching member is separated from the second rotation output member. When the switching member is in the second position, the first rotation output member is disengaged from its downstream power transmission member, and the switching member is drivingly connected to the second rotation output member. In the stapler, the first rotation output member drives the staple magazine bracket to move up and down, and the second rotation output member drives the firing screw to rotate. Thus, the rotation of the rotation input shaft can be selectively provided to the downstream power transmission member and the second rotation output member of the first rotation output member. The power switching device has a simple and compact structure, low cost, and is suitable for mass production.

Description

Technical Field

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

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

[0003] In order to avoid the instability and inconvenience of manual closing and firing drive, the current staplers have adopted electric drive to complete the driving of the closing and firing movements. 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 closing and firing movements successively through a power switching device and make the power switching device 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 device with a simple structure and a linear cutting stapler having the power switching device.

[0006] (II) Technical solution

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

[0008] On the one hand, the present invention provides a power switching device, including a rotating input shaft, a first rotating output member, a second rotating output member, a switching member and a switching power input member; the switching member can be movably mounted on the rotating input shaft between a first position and a second position, and when the switching member is in the first position and the second position, the rotating input shaft is connected thereto in a driving rotation manner; the switching power input member is connected to the switching member, the switching power input member can rotate relative to the switching member, and can drive the switching member to move between the first position and the second position; the first rotating output member is fixed on the switching member; when the switching member is in the first position, the first rotating output member is in a transmission position where it can be driven and connected to its downstream power transmission member, and the switching member is separated from the second rotating output member; when the switching member is in the second position, the first rotating output member is in a disengaged position where it is disengaged from its downstream power transmission member, the switching member is connected to the second rotating output member, and can drive the second rotating output member to rotate.

[0009] According to the present invention, the switching member is a hollow shaft, the second rotation output member is a rotating shaft, and the switching member is sleeved outside the second rotation output member when in the second position; the switching member and the second rotation output member are both coaxially arranged with the rotation input shaft.

[0010] According to the present invention, the inner wall at the rear end of the switching member has at least two circumferentially spaced stops, at least two stops are staggered along the diameter, a radially through-going slide groove is provided on the second rotating output member, a slider is supported in the slide groove so as to be movably radially along the second rotating output member, and at least one end of the slider extends out of the slide groove; when the switching member is in the first position, the stop block is located at the front side of the slider; when the switching member is in the second position, the stop block corresponds to the slider in the circumference.

[0011] According to the present invention, the switching member is also sleeved on the outside of the second rotation output member when in the first position, and the switching member forms a selectable driving connection with the middle portion of the second rotation output member.

[0012] According to the present invention, the inner wall at the rear end of the switching member has at least two circumferentially spaced stops, at least two stops are staggered along the diameter, a radially penetrating slide groove is provided on the middle part of the second rotating output member, a slider can be supported in the slide groove for radial movement along the second rotating output member, and at least one end of the slider extends out of the slide groove; when the switching member is in the first position, the stop block is located at the front side of the slider; when the switching member is in the second position, the stop block corresponds to the slider in the circumference.

[0013] According to the present invention, the front end of the sliding block is tapered, and the inner side surface of the rear end of the stopper is provided with an inclined surface inclined outwardly toward the rear side.

[0014] According to the present invention, a strip hole is provided on the slider, the length direction of the strip hole is along the radial direction of the second rotation output member, and the slider is supported on the second rotation output member through a rod passing through the strip hole.

[0015] According to the present invention, an elastic member is sleeved on the second rotating output member, a blocking wall is provided on the inner wall of the switching member, and a blocking wall is also provided on the second rotating output member, and the elastic member abuts between the two blocking walls; or an elastic member is sleeved on the rotating input shaft, and the two ends of the elastic member are respectively connected to the rotating input shaft and the switching member.

[0016] According to the present invention, the front end of the switching member is connected to the rear end of the rotating input shaft in a manner that the switching member can move axially and can be driven to rotate.

[0017] According to the present invention, the rear end of the rotary input shaft is configured as a non-circular end, and the front end of the switching member has a non-circular hole plug-fitted with the non-circular end.

[0018] According to the present invention, the rear end of the rotation input shaft is rotatably sleeved with the front end of the second rotation output member.

[0019] According to the present invention, the first rotation output member is sleeved on the switching member; the first rotation output member is coaxial with the switching member.

[0020] According to the present invention, the first rotation output member is a bevel gear, the inner hole of the bevel gear has a plurality of arc teeth arranged at intervals; the outer wall of the front end of the switching member has a plurality of arc grooves meshing with the plurality of arc teeth.

[0021] According to the present invention, it also includes a shell, two first bearings, a second bearing, a first bearing seat and a second bearing seat; the first bearing seat is fixed in the shell; the second bearing seat can be fixed on the anvil bracket of the linear cutting stapler; the first bearing seat is located on the front side of the switching member, the two first bearings are coaxially fixed in the first bearing seat, and the rotating input shaft is supported in the two first bearings; the second bearing seat is located on the rear side of the switching member, the second bearing is fixed in the second bearing seat, the lower end of the second bearing seat is integrally formed with a positioning block for positioning, and the second rotating output member is supported in the second bearing.

[0022] According to the present invention, it also includes a shell; the rotating input shaft, the first rotating output member, the second rotating output member and the switching member are located in the shell; the switching power input member includes a toggle member, and the shell is provided with a slideway for the toggle member to extend out of the shell, the slideway includes a first slideway section and a second slideway section connected end to end, the first slideway section extends along the axial direction of the rotating input shaft, the second slideway section is perpendicular to the first slideway section, and the position and length of the first slideway section are constructed so that the sliding of the switching power input member on the first slideway section can drive the switching member to move between the first position and the second position.

[0023] According to the present invention, the slide also includes a third slide section connected to the second slide section, the third slide section extends axially along the rotating input shaft, the second slide section is perpendicular to the third slide section, and the tail of the third slide section is toward the head side of the first slide section, and the position and length of the third slide section are constructed so that when the switching power input member stays at the tail of the third slide section, the switching member remains drivingly connected to the second rotating output member.

[0024] According to the present invention, it also includes a positioning seat; the positioning seat can be fixed on the anvil bracket, and the positioning seat is generally in an inverted L shape, with a rectangular hole for plugging with the anvil on the short side, and an axial hole for the second rotating output member to pass through with clearance on the long side.

[0025] According to the present invention, a positioning block is formed at the bottom of the long side, and the positioning block is used for inserting and positioning with the positioning hole on the nail anvil bracket.

[0026] According to the present invention, an annular groove or an annular protrusion is further provided on the outer wall of the switching member, at the rear side of the connection position between the first rotating output member and the switching member; the switching power input member includes a connected toggle member and a coupling plate, the coupling plate has a groove end matching the shape of the annular groove or the annular protrusion, and the groove end is relatively rotatably plugged into the annular groove or the annular protrusion.

[0027] On the other hand, the present invention provides a linear cutting stapler, including a staple magazine assembly, the staple magazine assembly including a staple magazine support and a firing screw, and also including any of the above-mentioned power switching devices; a first rotating output member is connected to the staple magazine support, and the rotation of the first rotating output member in the transmission position can be converted into the up and down movement of the staple magazine support; the second rotating output member is connected to the firing screw, and the rotation of the second rotating output member can be converted into the rotation of the firing screw.

[0028] (III) Beneficial effects

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

[0030] The power switching device of the present invention and the linear cutting stapler having the power switching device connect the switching member to the rotating input shaft, and fix the first rotating output member to the switching member at the same time, so that the first rotating output member can selectively transmit power as the switching member moves, and the second rotating output member and the switching member form a selective driving connection that can be axially movable. As a whole, the rotation of the rotating input shaft can be selectively provided to the downstream power transmission member of the first rotating output member and the second rotating output member. The power switching device has a simple and compact structure and low cost, and is suitable for mass production.

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

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

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

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

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

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

[0037] Figure 6 It is a front schematic diagram of the linear cutting stapler provided in the specific implementation manner.

[0038] [Description of Reference Numerals]

[0039] 1: Nail magazine assembly; 101: Nail magazine bracket; 102: Nail magazine; 103: Nail anvil bracket; 104: Nail anvil; 105: Firing screw; 106: Firing nut;

[0040] 2: closing drive mechanism; 201: bevel gear; 202: closing screw; 203: closing nut; 204: E-shaped retaining spring;

[0041] 3: power switching device; 301: rotating input shaft; 3011: first shaft section; 3012: second shaft section; 3013: third shaft section; 3014: fourth shaft section; 3015: annular protrusion; 3016: circular blind hole;

[0042] 302: first rotating output member; 3021: arc tooth; 303: second rotating output member; 3031: shaft segment 1; 3032: shaft segment 2; 3033: shaft segment 3; 3034: shaft segment 4; 3035: shaft segment 5; 3036: slide groove; 3037: axial plug hole;

[0043] 304: switching member; 3041: arc groove; 3042: stopper; 3043: annular groove; 305: switching power input member; 3051: toggle member; 3052: engaging piece;

[0044] 306: housing; 3061: first slide section; 3062: second slide section; 3063: third slide section; 307: first bearing; 308: first bearing seat; 3081: retaining ring; 3082: annular retaining edge; 309: second bearing; 310: second bearing seat; 3101: positioning block; 311: positioning seat: 3111: rectangular hole; 3112: positioning block; 312: fixing pin; 314: fixing pin; 315: slider; 316: round rod; 317: elastic member. DETAILED DESCRIPTION

[0045] 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 also referred to as the direction from "front" to "back".

[0046] Reference Figures 1 to 6 This embodiment provides a linear cutting stapler, which includes a stapler assembly 1, a closing drive mechanism 2 and an embodiment of a power switching device 3.

[0047] The nail magazine assembly 1 includes a nail magazine support 101 with a nail magazine 102, a nail anvil support 103 with a nail anvil 104, a firing screw 105 and a firing nut 106. The specific structure and working principle of the nail magazine assembly 1 are the same as those in the prior art, so the structure that is not related to the movement of the power switching device 3 of the present invention is not repeated here.

[0048] like Figure 1 and Figure 2 As shown, the power switching device 3 includes a rotation input shaft 301, a first rotation output member 302, a second rotation output member 303, a switching member 304, a switching power input member 305, a housing 306, two first bearings 307, a second bearing 309, a first bearing seat 308, a second bearing seat 310 and a positioning seat 311. The rotation input shaft 301, the first rotation output member 302, the switching member 304, the first bearing 307 and the first bearing seat 308 are located in the housing 306, and the second bearing seat 310, the second bearing 309 and the positioning seat 311 are located in the nail anvil bracket 103. The proximal part of the second rotation output member 303 is rotatably located in the housing, and the rear part is rotatably located in the nail anvil bracket.

[0049] The overall shape of the housing 306 is a rectangular parallelepiped, and is composed of two left and right parts along the front-back direction, and the two parts are fixed by a fixing pin. The first bearing seat 308 is fixed in the housing 306 by a fixing pin 312. The first bearing seat 308 has a rectangular shape, which can make the first bearing seat 308 more stably fixed in the housing 306, especially when there is a mounting plane adapted to the first bearing seat 308 in the housing, the first bearing seat 308 will not rotate unnecessarily, and at the same time, the rectangular bearing seat is also easier to fix with the housing 306. Two first bearings 307 are coaxially fixed in the first bearing seat 308, and the rotation input shaft 301 passes through the two first bearings 307 and is formed by the two first bearings 307 to form a rotation support for the rotation input shaft 301. The position of the axis of the rotation input shaft 301 is fixed by the two first bearings 307. The axis of the rotation input shaft 301 is perpendicular to the closing direction, parallel to the extension direction of the nail anvil support and the nail magazine support, and also parallel to the axis direction of the firing screw.

[0050] Specifically, the proximal end of the rotation input shaft 301 is used to connect with a power source capable of outputting rotation, such as a motor, to introduce the rotational power into the power switching device 3. Of course, in other embodiments, the rotation input shaft 301 may also be the output shaft of the power source itself.

[0051] The rotating input shaft 301 includes, from near to far, a first shaft section 3011, a second shaft section 3012, a third shaft section 3013 and a fourth shaft section 3014 which are connected in sequence and are coaxial. The diameter of the first shaft section 3011 is smaller than the diameter of the second shaft section 3012. A C-shaped retaining ring 3081 is provided at the connection between the first shaft section 3011 and the second shaft section 3012. The retaining ring 3081 is fixed in an annular groove on the inner wall of the first bearing seat 308. An annular protrusion 3015 is provided at the proximal end of the second shaft section 3012. A first bearing 307 is axially limited between the retaining ring 3081 and the annular protrusion 3015. The diameter of the third shaft segment 3013 is smaller than the diameter of the second shaft segment 3012, that is, an annular end face is formed between the second shaft segment 3012 and the third shaft segment 3013, and an inward annular rib 3082 is provided at the distal end of the first bearing seat 308, and another first bearing 307 is axially limited between the annular rib 3082 and the annular end face. The cross section of the fourth shaft segment 3014 is D-shaped, and the diameter of the circle where the arc edge of the D-shape is located is the same as the diameter of the third shaft segment 3013. A circular blind hole 3016 extending in the axial direction is provided at the distal end of the fourth shaft segment 3014, and the axis of the circular blind hole 3016 coincides with the axis of the rotating input shaft 301.

[0052] The second bearing seat 310 is fixed in the anvil support by a fixing pin 314. The upper portion of the second bearing seat 310 is rectangular in shape to facilitate fixing in the anvil support, and then the left and right side walls thereof are smoothly contracted inward and downward in an arc to form a first arc surface, and then bent to form a second arc surface, and finally the second arc surfaces on both sides are connected by a plane, which constitutes the bottom surface of the second bearing seat 310, so that adaptive changes can be made according to the shape of the shaft used for support. At the same time, a positioning block 3101 of a cube or a cuboid integrally formed with the second bearing seat 310 is provided on the bottom surface of the second bearing seat 310, and a positioning hole is provided on the bottom wall of the nail anvil support, and the positioning block 3101 is inserted into the positioning hole, so that the second bearing seat 310 can be fixedly positioned in the nail anvil support housing 306. Since the axis of the second bearing seat 310 plays a major role in determining the axis position of the second rotating output member 303 (which will be described in detail later), the precise positioning of the second bearing seat 310 and the first bearing seat 308 can ensure that the rotating input shaft 301 is coaxial with the axis of the second rotating output member 303, thereby ensuring smooth switching. The second bearing 309 is fixed in the second bearing seat 310. Specifically, the second bearing seat 310 has a bearing hole and an axial hole connected in the axial direction, the bearing hole is located on the far side of the axial hole, the diameter of the bearing hole is larger than the diameter of the axial hole, and the second bearing 309 is supported in the bearing hole.

[0053] The second rotation output member 303 is a rotating shaft, which is inserted into the shaft hole of the second bearing 309 and the shaft hole of the second bearing seat 310. The second rotation output member 303 is supported by the shaft hole of the second bearing 309 and is rotatably connected to the second bearing 309, but does not contact the shaft hole of the second bearing seat 310. Figure 4-5As shown, the second rotation output member 303 includes a shaft segment 1 3031, a shaft segment 2 3032, a shaft segment 3 3033, a shaft segment 4 3034 and a shaft segment 5 3035 which are sequentially connected from near to far. The diameter of the shaft segment 1 3031 is smaller than the diameter of the shaft segment 2 3032, the diameter of the shaft segment 2 3032 is smaller than the diameter of the shaft segment 3 3033, the diameter of the shaft segment 3 3033 is smaller than the diameter of the shaft segment 4 3034, and the diameter of the shaft segment 4 3034 is smaller than the diameter of the shaft segment 5 3035. The shaft segment 3 3033 passes through the second bearing 309 and the shaft hole in the above-mentioned bearing hole, that is, the cooperation between the shaft segment 3 3033 and the second bearing 309 plays a major role in supporting the second rotation output member 303. The transition surface between the bearing hole and the shaft hole and the transition surface between the shaft segment 3 3033 and the shaft segment 4 3034 constitute an axial limit for the second bearing 309. The proximal end of the second rotation output member 303 (i.e., the proximal end of the shaft section 1 3031) is bidirectionally rotatably sleeved with the distal end of the rotation input shaft 301, i.e., the proximal end of the second rotation output member 303 extends into the circular blind hole 3016 of the fourth shaft section 3014 of the rotation input shaft 301, but there is a gap between the proximal end of the second rotation output member 303 and the inner wall of the circular blind hole 3016, and the two do not form any driving connection. With such a configuration, the rotation is more stable and the axial structure can be made more compact.

[0054] The shaft section 3033 of the second rotating output member 303 is provided with a radially penetrating slide groove 3036, that is, the slide groove 3036 is opened along the diameter direction of the shaft section 3033 and penetrates the peripheral wall of the shaft section 3033, and the slide groove 3036 itself is a rectangular groove, and the slide groove 3036 is located in the middle of the second rotating output member 303. A slider 315 is supported in the slide groove 3036 so as to be movable in both directions along the radial direction of the second rotating output member 303, and at least one end of the slider 315 extends out of the slide groove 3036. In this embodiment, both ends of the slider 315 extend out of the slide groove 3036.

[0055] Specifically, the slider 315 is in the shape of a plate-like member, and a strip hole (preferably a long hole) is provided on the slider 315 that penetrates the slider 315 along the thickness direction of the slider 315, and the length direction of the strip hole is along the radial direction of the second rotation output member 303, and the slider 315 is supported on the shaft section 3033 of the second rotation output member 303 through the round rod 316 passing through the strip hole. In order to facilitate the installation of the slider 315, cavities are provided on both sides of the slide groove 3036 in the shaft section 3033, so that the round rod 316 on the slider 315 can be installed, so that the two ends of the round rod 316 pass through the supporting holes on the side wall of the shaft section 3033. In addition, the proximal end of the slider 315 is gradually reduced, and inclined surfaces are formed on the upper and lower surfaces of the proximal end of the slider 315.

[0056] The shaft section 5 3035 is provided with an axial socket 3037, which is used to connect with the firing screw 105 in a manner that the bidirectional rotation of the second rotation output member 303 is converted into the bidirectional rotation of the firing screw 105. For example, the axial socket 3037 on the shaft section 5 3035 is a D-shaped hole, and the proximal end of the firing screw 105 is configured as a D-shaped end, and the D-shaped end and the D-shaped hole form a connection that can be axially moved and driven for bidirectional rotation. The firing screw 105 is screwed with the firing nut 106, and the bidirectional rotation of the firing screw 105 is converted into the bidirectional movement of the firing nut 106. Preferably, the axis of the second rotation output member 303 coincides with the axis of the firing screw 105, that is, they are coaxial.

[0057] The switching member 304 is a hollow shaft, which is sleeved on the outside of the rotation input shaft 301 and the second rotation output member 303 and is coaxial with the rotation input shaft 301 and the second rotation output member 303. The first bearing seat 308 is located on the proximal side of the switching member 304, and the second bearing seat 310 is located on the distal side of the switching member 304, that is, the rotation input shaft 301 is located on the proximal side of the second rotation output member 303, the rotation input shaft 301 is at least partially located on the proximal side of the switching member 304, and the second rotation output member 303 is at least partially located on the distal side of the switching member 304. The proximal end of the switching member 304 has a plug hole that matches the shape of the fourth shaft segment 3014 of the rotation input shaft 301, and the fourth shaft segment 3014 is inserted into the plug hole. In this embodiment, since the cross section of the fourth shaft segment 3014 is D-shaped, the plug hole on the switching member 304 is also a D-shaped hole. In this way, a driving connection that can move axially in both directions and drive bidirectional rotation is formed between the proximal end of the switching member 304 and the distal end of the rotating input shaft 301, that is, the switching member 304 can move axially in both directions relative to the rotating input shaft 301, and the bidirectional rotation of the rotating input shaft 301 will drive the switching member 304 to rotate in both directions. In addition, the setting of the insertion hole of the switching member 304 and the length of the fourth shaft segment 3014 can realize that when the switching member 304 moves between the first position and the second position arranged along the axial direction of the rotating input shaft 301, the switching member 304 forms the above-mentioned driving connection with the rotating input shaft 301 when it is in the first position and the second position. In other words, when the switching member 304 is in the first position, the engagement length of the switching member 304 and the fourth shaft segment 3014 is large, and when the switching member 304 is in the second position, the engagement length of the switching member 304 and the fourth shaft segment 3014 is smaller than that of the previous position, but is still in a state of driving connection. In this embodiment, the first position is located near the second position, that is, the front side.

[0058] The first rotation output member 302 is sleeved on the proximal end of the switching member, the transmission position of the first rotation output member 302 is located on the proximal side of the disengagement position, and the first rotation output member 302 is coaxial with the switching member.

[0059] In this embodiment, the first rotating output member 302 is a bevel gear, and the inner hole of the bevel gear has a plurality of arc teeth 3021 arranged at intervals. The outer wall of the proximal end of the switching member 304 has a plurality of arc grooves 3041 meshing with the plurality of arc teeth 3021, thereby the first rotating output member 302 is drivingly connected to the switching member 304. The arc-shaped tooth grooves can increase the transmission strength and reduce the wear of the tooth grooves. At the same time, the far side of the arc groove 3041 is formed by the outer wall of the switching member 304 itself to form a side groove bottom, and the proximal side of the arc groove 3041 is provided with a retaining ring 3081 sleeved on the switching member 304, and the first rotating output member 302 is limited between the above-mentioned side groove bottom and the above-mentioned retaining ring 3081 along the axial direction of the switching member 304, so that the first rotating output member 302 and the switching member 304 are fixed.

[0060] The first rotating output member 302 and the nail magazine support 101 are connected through the closed driving mechanism 2 to convert the bidirectional rotation of the first rotating output member 302 at the transmission position into the up and down movement of the nail magazine support 101. Figure 3 As shown, the closing drive mechanism 2 includes a bevel gear 201, a closing screw 202 and a closing nut 203. The axis of the closing screw 202 is perpendicular to the axis of the rotation input shaft. The first rotation output member 302 can mesh with the bevel gear 201 in the closing drive mechanism 2 when the switching member is in the first position. The bevel gear 201 in the closing drive mechanism 2 is fixedly sleeved with the closing screw 202. The closing nut 203 is screwed on the closing screw 202. The closing nut 203 is fixedly connected to the nail magazine support 101. Therefore, the bidirectional rotation of the bevel gear 201 drives the bidirectional rotation of the closing screw 202, thereby driving the closing nut 203 to move up and down, and then driving the nail magazine support 101 to move up and down, forming the opening and closing of the nail magazine support 101 and the nail anvil support 103. Among them, an E-shaped retaining spring 204 is sleeved on the closing screw 202 to prevent the bevel gear 201 from separating from the closing screw 202. In the actual application process, different shapes of E-shaped retaining springs 204 can be selected according to actual needs. Of course, in other embodiments, the first rotation output member 302 may also be a common transmission gear, and the corresponding closing drive mechanism 2 is subsequently used to transmit power to the nail magazine support 101.

[0061] The inner wall of the distal end of the switching member 304 is provided with three circumferentially evenly spaced blocks 3042, so that the three blocks 3042 are staggered along the diameter, that is, any two blocks 3042 are not on the same diameter. The circumferential side surface of each block 3042 can be used to form a push with the circumferential side surface of the slider 315, thereby forming a driving connection between the switching member 304 and the second rotating output member 303, which can be axially relatively moved in both directions and can be driven to rotate in both directions. Corresponding to the tapered design of the slider 315, the inner side surface of the distal end of the block 3042 is provided with an inclined surface inclined outward toward the distal side, and the inclined surface has the same inclination angle as the inclined surface on the slider 315. The purpose of such arrangement is that the switching member 304 stops at a different angle each time after rotating in the first position. For example, if only one stop block 3042 is provided, the stop position of the stop block 3042 may be directly opposite to the slider 315 on the second rotating output member 303. In this way, the stop block 3042 will axially abut against the slider 315 during the movement of the switching member 304 to the second position, thereby preventing the switching member 304 from reaching the second position to form a driving connection with the second rotating output member 303. The multiple blocks 3042 staggered along the diameter of the switching member 304 are combined with the slider 315 to be radially movable in both directions. When the slider 315 is directly opposite to one of the blocks 3042, as the switching member 304 moves axially, the slider 315 will be pushed radially inward by the block 3042 directly opposite to it (the inclined surfaces on the slider 315 and the block 3042 are conducive to this pushing) so as not to hinder the switching member 304 from moving to the second position to form a driving connection with the second output rotating member. The other end of the slider 315 will be more prominent and better correspond to the block 3042 on the other side in the circumferential direction. Since the three blocks 3042 are evenly arranged and the slider 315 has only two ends, there may be a certain distance between the slider 315 and the block 3042 corresponding to it in the circumferential direction. When the switching member 304 rotates again, it will idle for a certain distance. When the block 3042 rotates to push against the slider 315 in the circumferential direction, it will push the second rotating output member 303 to rotate. This idle distance will only cause the discharge time of the firing staples to be slightly earlier or later, and will not affect the suturing effect. Therefore, this design can ensure the smooth switching between the closed state and the firing state.

[0062] In this way, the switching member 304 forms a selective driving connection with the middle part of the second rotating output member 303, so that the rotation of the second rotating output member 303 is more stable. In combination with the proximal end of the second rotating output member 303 and the distal end of the rotating input shaft 301 being rotatably sleeved, the switching member 304 can be made as short as possible while being able to complete the switching work, thereby facilitating the reduction of the axial size of the stapler, and facilitating the overall setting of each shaft to be shorter and more stable in operation.

[0063] The second shaft segment 3032 of the second rotating output member 303 is sleeved with an elastic member 317. The inner wall of the switching member 304 is provided with a blocking wall, and the transition wall between the second shaft segment 3032 and the third shaft segment 3033 of the second rotating output member 303 constitutes the blocking wall, and the elastic member 317 abuts between the two blocking walls. The elastic member 317 is preferably a spring.

[0064] Further, an annular groove 3043 is also provided on the outer wall of the switching member 304, on the far side of the arc groove 3041, that is, on the far side of the connection position between the first rotating output member and the switching member 304. The switching power input member 305 includes a connected toggle member 3051 and a coupling piece 3052, the coupling piece 3052 has a groove end matching the shape of the annular groove 3043, and the groove end and the annular groove 3043 can be plugged in a relatively bidirectional rotation, thereby forming a switching power input member 305 that is connected to the switching member 304 in a manner that it can rotate bidirectionally relative to the switching member 304 and can drive the switching member 304 to move bidirectionally between the first position and the second position. The switching power input member 305 in this embodiment provides manual input switching power. The toggle member 3051 is a rod body.

[0065] like Figure 6 As shown, the shell 306 is provided with a slide for the toggle member 3051 to extend out of the shell 306, and the slide includes a first slide section 3061, a second slide section 3062 and a third slide section 3063 which are connected end to end, the first slide section 3061 and the third slide section 3063 extend along the axial direction of the rotating input shaft, the second slide section 3062 is perpendicular to the first slide section 3061 and the third slide section 3063, the head of the first slide section 3061 is located on the proximal side, and the tail is located on the distal side; the head of the third slide section 3063 is located on the distal side, and the tail is located on the proximal side, so that the tail of the third slide section 3063 is toward the head side of the first slide section 3061. The position and length of the first slide section 3061 are constructed so that the sliding of the switching power input member 305 between the head and the tail along the first slide section 3061 can drive the switching member 304 to move between the first position and the second position, and the position and length of the third slide section 3063 are constructed so that when the switching power input member 305 stays at the tail of the third slide section 3063, the switching member 304 maintains a driving connection with the second rotating output member 303. At this time, the length of the circumferential resistance between the stop block 3042 of the switching member 304 and the slider 315 of the second rotating output member 303 is less than the length of the circumferential resistance formed by the two when the switching member 304 is in the second position, but it can still ensure that the circumferential resistance that meets the driving connection requirements is achieved.

[0066] The positioning seat 311 is fixed to the anvil support 103 by a fixing pin. The positioning seat 311 is in an inverted L shape as a whole, and a rectangular hole 3111 is provided at the short side, and the rectangular hole 3111 is plugged into the anvil 104; an axial hole is provided on the long side, so that the shaft section 4 3034 of the second output member can pass through with a gap, that is, it does not contact the shaft section 4 3034. At the same time, a positioning block 3112 is formed at the bottom of the long side, and the positioning block 3112 is used to be plugged into and positioned with the positioning hole of the anvil support 103. Through the setting of the positioning seat 311, the power switching device 3 and the anvil 104 can be well positioned to ensure the suturing effect.

[0067] In summary, the power switching device in this embodiment can complete the following actions:

[0068] first step:

[0069] When the toggle member 3051 abuts against the proximal end surface of the first slideway section 3061, the switching member 304 is located at the first position. At this time, the first rotation output member 302 is located at a transmission position capable of driving and connecting with its downstream power transmission member (in this embodiment, the bevel gear 201 in the closing drive mechanism 2), and the switching member 304 is separated from the second rotation output member 303 (that is, at this time, the stopper 3042 of the switching member 304 is located on the proximal side of the slider 315 on the second rotation output member 303 and does not form a connection). The motor is started, and the rotation of the rotation input shaft 301 is converted into the rotation of the switching member 304. The rotation of the switching member 304 drives the first rotation output member 302 to rotate, while the second rotation output member 303 does not rotate. The rotation of the first rotation output member 302 drives the closing screw 202 to rotate through the bevel gear 201, and the rotation of the closing screw 202 drives the closing nut 203 to move downward, and the nail magazine support 101 moves downward to the distance of the nail anvil support 103 to meet the closing requirement.

[0070] Step 2:

[0071] Stop the operation of the motor, and the operator drives the toggle member 3051 to move from the proximal end of the first slide section 3061 toward the distal end of the first slide section 3061, driving the switching member 304 to move toward the second position. The first rotating output member 302 also moves with the switching member 304 and gradually disengages from its downstream power transmission member, and the elastic member 317 is compressed.

[0072] When the toggle member 3051 abuts against the distal end surface of the first slideway section 3061, the switching member 304 is located at the second position. Since the elastic member 317 is in the power storage state, the operator cannot release the toggle member 3051, and needs to continuously apply a thrust to the toggle member 3051 to maintain the toggle member 3051 at this position. At this time, the first rotation output member 302 is located at a disengaged position from its downstream power transmission member (another bevel gear 201 in this embodiment), and the stopper 3042 of the switching member 304 corresponds to the slider 315 on the second rotation output member 303 in the circumferential direction, so that the switching member 304 and the second rotation output member 303 form a driving connection.

[0073] When the toggle member 3051 abuts against the distal end surface of the first slideway section 3061, the operator will feel in place, and then the operator drives the toggle member 3051 to rotate to the second slideway section 3062, and the switching member 304 remains in the second position. The operator continues to drive the toggle member 3051 into the third slideway section 3063 and dials the toggle member back until it presses against the proximal end surface of the third slideway section 3063. During this process, the switching member 304 follows the dialing back of the toggle member 3051 and moves a short distance from the second position to the proximal side, but the block 3042 and the slider 315 only move a short distance axially relative to each other, and the two are still in a circumferential corresponding state and maintain a driving connection. At this time, the switching member 304 remains in a driving connection with the second rotation output member 303, the elastic member 317 remains in a compressed state, the toggle member 3051 is locked, and the operator can let go. Therefore, by providing the third slide section 3063 , a function of locking the switching member 304 is provided, so that the operator does not need to continuously act on the switching power input member 305 .

[0074] Among them, the circumferential correspondence formed by the stop block 3042 and the slider 315 can be that the stop block 3042 is in circumferential contact with the slider 315 when the switching member 304 is in the second position, or that the stop block 3042 and the slider 315 are circumferentially spaced a certain distance apart when the switching member 304 is in the second position, but when the switching member 304 starts to rotate a certain angle, it will contact with the slider 315 and then push the slider 315 to rotate. This situation is also a driving connection.

[0075] Step 3: Start the motor, and the rotation of the input shaft 301 is converted into the rotation of the switching member 304. The switching member 304 drives the second rotating output member 303 to rotate, and the second rotating output member 303 drives the firing screw 105 to rotate, so that the firing nut 106 moves axially to fire.

[0076] Step 4:

[0077] When the firing is required to be released, the driving motor rotates in the reverse direction (opposite to the direction in the third step), the rotating input shaft 301 rotates in the reverse direction (opposite to the direction in the third step), the switching member 304 rotates in the reverse direction (opposite to the direction in the third step), the second rotating output member 303 rotates in the reverse direction (opposite to the direction in the third step), the firing screw 105 rotates in the reverse direction (opposite to the direction in the third step), and the firing nut 106 moves proximally to return to its original position.

[0078] Step 5:

[0079] The motor is stopped, and the operator drives the toggle member 3051 from the third slide section 3063 through the second slide section 3062 into the first slide section 3061, and then the operator can let go, and the stored force of the elastic member 317 pushes the switching member 304 to move toward the first position until the toggle member 3051 reaches the proximal end surface of the first slide section 3061, and the switching member 304 returns to the first position. After that, the driving motor rotates in the opposite direction (opposite to the direction in the first step), the rotation input shaft 301 rotates in the opposite direction (opposite to the direction in the first step), the switching member 304 rotates in the opposite direction (opposite to the direction in the first step), the first rotation output member 302 rotates in the opposite direction (opposite to the direction in the first step), the bevel gear 201 in the closing drive mechanism 2 rotates in the opposite direction (opposite to the direction in the first step), the closing screw 202 in the closing drive mechanism 2 rotates in the opposite direction (opposite to the direction in the first step), the closing nut 203 in the closing drive mechanism 2 moves upward, and the nail magazine support 101 moves upward and returns to the open state.

[0080] In summary, in this embodiment, the switching member is connected to the rotating input shaft, and the first rotating output member 302 is fixed to the switching member 304, so that the first rotating output member 302 can selectively transmit power as the switching member 304 moves, and the second rotating output member 303 and the switching member 304 form a selective driving connection that can move axially in both directions. On the whole, the bidirectional rotation of the rotating input shaft 301 can be selectively provided to the downstream power transmission member of the first rotating output member 302 and the second rotating output member 303. The power switching device 3 has a simple and compact structure and low cost, and is suitable for mass production.

[0081] Furthermore, the second rotating output member 303 is configured as a rotating shaft and is coaxially arranged with the rotating input shaft 301, and the switching member 304 is configured as a hollow shaft sleeve arranged on the outside of the rotating input shaft 301 and the second rotating output member 303, so that the components that play a role in power transmission in the power switching device 3 are arranged along an axis, the structure is simpler, and the radial area occupied in the linear cutting stapler is smaller, which is conducive to the grasping and use of the linear cutting stapler.

[0082] Furthermore, the second rotary output member 303 is directly connected to the firing screw coaxially, which also makes the radial area of ​​the linear cutting stapler smaller and makes the axial structure more compact.

[0083] Of course, the above is only one embodiment, and the present invention is not limited to the above embodiment. For example, the following structures may be selectively but not limited to be changed:

[0084] In other embodiments, the cross section of the fourth shaft section 3014 of the rotating input shaft 301 is not limited to the D-shape. Generally speaking, a non-circular shape can achieve the function of axial movement and circumferential rotation drive. In addition to the D-shape, a rectangular or gear shape is preferably used. Correspondingly, the D-shaped hole on the switching member 304 can also be changed into other embodiments of the non-circular hole. Whether it is a D-shaped hole or a hole in other forms, there is a disadvantage that it is difficult to align during plugging. Therefore, the following optimization is performed: the fourth shaft section 3014 of the rotating input shaft 301 is a D-shaped shaft, and a plug block protruding radially outward is provided on the outer wall of the distal end of the D-shaped shaft. The axial plug hole 3037 at the proximal end of the switching member 304 is a D-shaped hole, and a slot is provided on the inner wall. An arc guide groove is provided on the proximal surface of the switching member 304 and on both sides of a corresponding slot. The two arc guide grooves extend in the direction toward the slot and are finally connected to the slot. Therefore, when the switching member 304 and the rotating input shaft 301 are plugged, the plug block slides to the slot along the arc guide groove to achieve blind plugging. In addition, the axial socket 3037 can be designed on the fourth shaft segment 3014 , and the proximal end of the switching member 304 forms an insertion shaft to connect with the axial socket 3037 on the rotation input shaft 301 .

[0085] In other embodiments, the D-shaped axial socket 3037 of the shaft segment 5 3035 of the second rotation output member 303 and the D-shaped end of the firing screw 105 can also be changed to other non-circular shapes, preferably rectangular or gear-shaped. At the same time, the axial socket 3037 can also be set at the proximal end of the firing screw 105, and the shaft segment 5 3035 forms an insertion shaft and is plugged into the axial socket 3037 of the firing screw 105. In addition, the above-mentioned arc guide groove can also be used to achieve blind insertion. For example, the proximal end of the firing screw 105 is constructed as a circular shaft, the axial socket 3037 of the shaft segment 5 3035 is a circular hole, and a slot is set on the inner wall of the circular hole. An arc guide groove is set on the distal surface of the shaft segment 5 3035 and on both sides of a corresponding slot. The two arc guide grooves extend in the direction toward the slot and are finally connected to the slot. Therefore, when the second rotation output member 303 and the firing screw 105 are aligned, the plug slides along the arc guide groove to the slot to achieve blind insertion. In addition, the firing screw 105 may be provided with an axial socket and the second rotation output member 303 may be provided with an insertion end that matches the axial socket.

[0086] In other embodiments, the connection between the rotation input shaft 301 and the switching member 304 and the connection between the second rotation output member 303 and the firing screw 105 may also be connected by a key.

[0087] In other embodiments, the arc teeth 3021 of the first rotation output member 302 and the arc grooves 3041 of the switching member 304 may be changed to cone teeth and cone grooves, etc. Alternatively, the first rotation output member 302 and the switching member 304 may be fixed together by fixing pins, bolts, etc.

[0088] In other embodiments, the number of blocks 3042 is not limited to three, and may also be set to two. However, when two are set, the idling stroke of the switching member 304 will be larger. Considering various parameters such as the idling stroke and product size, three blocks 3042 are a better choice.

[0089] The matching arrangement of the slider 315 and the stopper 3042 in the above embodiment is to ensure that the switching member 304 can be smoothly plugged into the second rotating output member 303 no matter at which angle the switching member 304 stops rotating. However, the structure for achieving this purpose is not limited thereto. For example, in other embodiments, a plurality of stoppers 3042 are provided, and at the same time, the same number of snaps as the stoppers 3042 are provided on the second rotating output member 303 along the circumferential direction, and the snaps can move in the radial direction. The angle difference between the stoppers 3042 is different from the angle difference between the snaps, so as to ensure that at least one pair of snaps and the stoppers 3042 can form a circumferential correspondence. In addition, both the snaps and the slider 315 can be provided on the switching member 304 instead, and the stopper 3042 can be provided on the second rotating output member 303.

[0090] In other embodiments, the settings of the stopper and the slider can be interchangeable. Accordingly, the rotation input shaft and the second rotation output member can be axially separated, the proximal end of the second rotation output member is set to be sleeve-shaped, and the inner wall is configured with a stopper. A sliding groove is set at the distal end of the switching member to fix the slider. The switching member can also be designed as a shaft as a whole, and the distal end of the rotation input shaft is set to be sleeve-shaped. However, this structure will cause the rotation input shaft and the second rotation output member to form a stepped structure, which is more complicated than the above-mentioned embodiment, and the stability is not as good as the above-mentioned embodiment.

[0091] In other embodiments, the stopper may be changed into an arched groove on the inner wall of the switching member, the slider may be changed into an arched snap buckle on the second rotating output member, or the stopper and the slider may be changed into other concave-convex matching structures. However, such structures are not as good as the transmission effect of the structure of the above embodiment.

[0092] In other embodiments, the elastic member 317 can be removed, and when the switching power input member 305 is located at the tail of the first slide section 3061 and needs to return to the head of the first slide section 3061, that is, when the switching member 304 is located at the second position and needs to return to the first position, the operator manually toggles the switching power input member 305. When there is no elastic member 317, although the operator can let go when the switching power input member 305 is pushed to the distal end surface of the first slide section 3061, the structural arrangement of the first slide section 3061, the second slide section 3062 and the third slide section 3063 can still play a role in locking the switching power input member 305, preventing the switching power input member 305 from shifting due to vibration during operation.

[0093] Of course, the elastic member 317 can also be set to be sleeved on the rotation input shaft 301, and the two ends of the elastic member are respectively connected to the rotation input shaft 301 and the switching member 304. When the switching member 304 moves from the first position to the second position, the elastic member 317 is stretched and stored.

[0094] Of course, whether or not there is an elastic member 317, in other embodiments, only the first slide section 3061 or the first slide section 3061 and the second slide section 3062 may be retained, and the latter may also play a certain locking role. In the above specific embodiment, the elastic member 317 is completely fixed inside the switching member, and the switching member is relatively long. Whether in the first position or the second position, the switching member is located outside the second rotating output member. However, in other embodiments, the switching member may also be moved to the outside of the second rotating output member only in the second position.

[0095] The above embodiment adopts manual switching, and electric switching can also be adopted. For example, a nut is connected to the switching power input member 305, and another motor is connected to a screw rod, and the nut is screwed on the screw rod. Therefore, when the switching member 304 needs to be driven, the button corresponding to the motor is pressed to control the rotation of the motor, thereby controlling the movement of the switching power input member 305.

[0096] In other embodiments, the annular groove 3043 on the switching member 304 may also be changed into an annular protrusion, and the engaging member forms a groove end (having an arc groove) matching the annular protrusion to engage therewith.

[0097] In summary, the above embodiment is that the power switching device 3 is used for a linear cutting stapler, but the power switching device 3 of the present invention is not limited thereto, and can also be used in other medical devices, and can even be used in other small electrical appliances.

[0098] 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 device for a stapler, characterized in that: It comprises a rotation input shaft (301), a first rotation output member (302), a second rotation output member (303), a switching member (304) and a switching power input member (305); The switching member (304) is movably sleeved on the rotating input shaft (301) between a first position and a second position, and when the switching member (304) is in the first position and the second position, the rotating input shaft (301) is connected to the switching member in a driving rotation manner; The switching power input member (305) is connected to the switching member (304); the switching power input member (305) is capable of rotating relative to the switching member (304) and is capable of driving the switching member (304) to move between the first position and the second position; The first rotation output member (302) is fixed on the switching member (304); When the switching member (304) is located at the first position, the first rotation output member (302) is located at a transmission position capable of being drivingly connected to its downstream power transmission member, and the switching member (304) is separated from the second rotation output member (303); When the switching member (304) is located at the second position, the first rotation output member (302) is located at a disengaged position from its downstream power transmission member, and the switching member (304) is connected to the second rotation output member (303) to drive the second rotation output member (303) to rotate; The first rotation output member (302) is connected to the stapler magazine support (101), and the rotation of the first rotation output member (302) in the transmission position can be converted into an up and down movement of the stapler magazine support (101); The second rotation output member (303) is connected to the firing screw (105) of the stapler, and the rotation of the second rotation output member (303) can be converted into the rotation of the firing screw (105); The switching member (304) is a hollow shaft, the second rotation output member (303) is a rotating shaft, and the switching member (304) is sleeved outside the second rotation output member (303) when in the second position; The switching member (304) and the second rotation output member (303) are both coaxially arranged with the rotation input shaft (301); The first rotation output member (302) is a bevel gear, and the inner hole of the bevel gear has a plurality of arc teeth (3021) arranged at intervals; The outer wall of the front end of the switching member (304) has a plurality of circular arc grooves (3041) meshing with the plurality of circular arc teeth (3021).

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

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

4. The power switching device of the stapler according to claim 3, characterized in that: The inner wall of the rear end of the switching member (304) is provided with at least two circumferentially spaced stoppers (3042), the at least two stoppers (3042) being staggered along the diameter, a radially penetrating slide groove (3036) is provided in the middle of the second rotating output member (303), a slider (315) is supported in the slide groove (3036) so as to be movable along the radial direction of the second rotating output member (303), and at least one end of the slider (315) protrudes from the slide groove (3036); When the switching member (304) is located at the first position, the stopper (3042) is located at the front side of the sliding block (315); When the switching member (304) is located at the second position, the stopper (3042) corresponds to the sliding block (315) in the circumferential direction.

5. The power switching device of the stapler according to claim 2 or 4, characterized in that: The front end of the sliding block (315) is gradually tapered, and the inner side surface of the rear end of the stopper (3042) is provided with an inclined surface inclined outwardly toward the rear side.

6. The power switching device of the stapler according to claim 2 or 4, characterized in that: The slider (315) is provided with a strip hole, the length direction of the strip hole is along the radial direction of the second rotation output member (303), and the slider (315) is supported on the second rotation output member (303) via a rod passing through the strip hole.

7. The power switching device of the stapler according to claim 1, characterized in that: An elastic member (317) is sleeved on the second rotating output member (303), a blocking wall is provided on the inner wall of the switching member (304), and a blocking wall is also provided on the second rotating output member (303), and the elastic member (317) abuts between the two blocking walls; or An elastic member is sleeved on the rotation input shaft (301), and two ends of the elastic member are respectively connected to the rotation input shaft (301) and the switching member (304).

8. The power switching device of the stapler according to claim 1, characterized in that: The front end of the switching member (304) is connected to the rear end of the rotating input shaft (301) in a manner that allows axial movement and can be driven to rotate.

9. The power switching device of the stapler according to claim 8, characterized in that: The rear end of the rotation input shaft (301) is configured as a non-circular end, and the front end of the switching member (304) has a non-circular hole that is plug-fitted with the non-circular end.

10. The power switching device of the stapler according to claim 1, characterized in that: The rear end of the rotation input shaft (301) is rotatably sleeved with the front end of the second rotation output member (303).

11. The power switching device of the stapler according to claim 1, characterized in that: The first rotation output member (302) is sleeved on the switching member (304); The first rotation output member (302) is coaxial with the switching member (304).

12. The power switching device of the stapler according to claim 1, characterized in that: It also includes a housing (306), two first bearings (307), a second bearing (309), a first bearing seat (308) and a second bearing seat (310); The first bearing seat (308) is fixed in the housing (306); The second bearing seat (310) can be fixed on the anvil support of the linear cutting stapler; The first bearing seat (308) is located at the front side of the switching member (304), the two first bearings (307) are coaxially fixed in the first bearing seat (308), and the rotating input shaft (301) is supported in the two first bearings (307); The second bearing seat is located at the rear side of the switching member (304), the second bearing (309) is fixed in the second bearing seat (310), a positioning block (3101) for positioning is integrally formed at the lower end of the second bearing seat (310), and the second rotating output member is supported in the second bearing (309).

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

14. The power switching device of the stapler according to claim 13, characterized in that: The slide also includes a third slide section (3063) connected to the second slide section (3062), the third slide section (3063) extending along the axial direction of the rotating input shaft, the second slide section (3062) is perpendicular to the third slide section (3063), and the tail of the third slide section (3063) faces the head side of the first slide section (3061), and the position and length of the third slide section (3063) are constructed so that when the switching power input member (305) stays at the tail of the third slide section (3063), the switching member (304) remains drivingly connected to the second rotating output member (303).

15. The power switching device of the stapler according to claim 1, characterized in that: Also includes a positioning seat (311); The positioning seat (311) can be fixed on the anvil bracket. The positioning seat (311) is in an inverted L shape as a whole, with a rectangular hole (3111) for plugging with the anvil (104) provided on the short side, and an axial hole for the second rotation output member (303) to pass through with clearance provided on the long side.

16. The power switching device of the stapler according to claim 15, characterized in that: A positioning block (3112) is formed at the bottom of the long side, and the positioning block (3112) is used to be inserted into and positioned with a positioning hole on the anvil bracket.

17. The power switching device of the stapler according to claim 1, characterized in that: An annular groove (3043) or an annular protrusion is also provided on the outer wall of the switching member (304) at the rear side of the connection position between the first rotation output member (302) and the switching member (304); The switching power input member (305) comprises a toggle member (3051) and an engaging piece (3052) connected to each other, wherein the engaging piece (3052) has a groove end matching the shape of the annular groove (3043) or the annular protrusion, and the groove end is plug-inly connected to the annular groove (3043) or the annular protrusion so as to be relatively rotatable.

Images