Linear cutting stapler

Abstract

The present application relates to a kind of linear cutting anastomat, wherein closure drive mechanism can make that the nail warehouse support approaches or away from nail anvil support;Switching piece is movable between first position and second position, and it is installed on rotary input shaft in the way that it can drive rotation, first rotary output piece is connected with closure drive mechanism in the way that it can drive rotation, second rotary output piece is connected with firing screw in the way that it can drive rotation;When switching piece is located in first position: switching piece is connected with first rotary output piece in the way of driving connection, switching piece is separated from second rotary output piece;When switching piece is located in second position: switching piece is disconnected with first rotary output piece, switching piece is connected with second rotary output piece in the way of driving connection wherein.The linear cutting anastomat of the present application, low cost, simple structure, when carrying out closure action and firing action, power transmission is stable and reliable.

Description

Technical Field

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

[0002] In general surgery, linear cutting staplers are often used to perform 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 achieve optimal compression of the tissue. The stapler fires when the distance between the stapler and anvil reaches a safe range for effective cutting and suturing.

[0003] In order to avoid the instability and inconvenience of manual closing and firing drives, current staplers have adopted electric drives to complete the driving of both 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.

[0004] The inventor of the present application hopes to make a linear cutting stapler to solve the power transmission problem of the stapler's closing action and firing action. Summary of the Invention

[0005] (1) Technical issues to be resolved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a linear cutting stapler, which solves the technical problems of the complex structure of the power transmission mechanism and unstable power transmission of the prior art stapler.

[0007] (2) Technical solution

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

[0009] An embodiment of the present invention provides a linear cutting stapler, comprising a staple cartridge support, a staple anvil support, a firing screw, a closing drive mechanism, and a power transmission mechanism;

[0010] The closing drive mechanism is connected to the nail magazine support or is connected to the nail magazine support and the nail anvil support at the same time, and can make the nail magazine support approach or move away from the nail anvil support;

[0011] The power transmission mechanism includes a rotation input shaft, a first rotation output member, a switching member, a second rotation output member and a safety switch;

[0012] The switching member is mounted on the rotation input shaft so as to be movable between a first position and a second position and to be driven to rotate with the rotation input shaft. The safety switch is connected to the switching member so as to be rotatable relative to the switching member and to drive the switching member to move. The first rotation output member is connected to the closing drive mechanism so as to be driven to rotate. The second rotation output member is connected to the firing screw so as to be driven to rotate.

[0013] When the switch is in the first position:

[0014] The switching member is connected to the first rotation output member in a driving connection manner, and the switching member is separated from the second rotation output member;

[0015] When the switch is in the second position:

[0016] The switching member is disconnected from the first rotation output member, and the switching member is connected to the second rotation output member in a driving connection.

[0017] Optionally, the first rotation output member includes a first bevel gear and a closed shaft sleeve, the first bevel gear is fixed on the closed shaft sleeve, and the closed shaft sleeve is sleeved on the periphery of the rotation input shaft;

[0018] The closing drive mechanism includes a suspension, a closing screw, a closing nut and a second bevel gear. The first bevel gear is meshed with the second bevel gear. The second bevel gear is fixedly sleeved with one end of the closing screw. The other end of the closing screw is rotatably connected to the suspension. The closing nut is screwed onto the closing screw, and the nail magazine bracket is fixed on the closing nut.

[0019] Optionally, it further comprises: a first sleeve seat, a first rotating sleeve and a second rotating sleeve;

[0020] The first sleeve seat is fixed to the suspension, the second rotating sleeve is placed in the first sleeve seat, the proximal side of the closing sleeve is supported in bidirectional rotation in the first sleeve seat by the second rotating sleeve, the first rotating sleeve is placed in the inner hole of the closing sleeve, the rotating input shaft passes through the first rotating sleeve and the closing sleeve, and the first rotating sleeve forms a bidirectional rotation support for the rotating input shaft;

[0021] When the switching member is located at the first position, it is inserted into the interior of the closing sleeve, and the switching member and the closing sleeve form a selectable driving connection.

[0022] Optionally, the switching member includes a first switching slider, a fixed slider and a switching sleeve;

[0023] The switching sleeve is sleeved on the outside of the rotating input shaft. The rotating input shaft is provided with a first sliding groove which is radially penetrated. The first switching slider and the fixed slider are supported in the first sliding groove so as to be movable in both directions along the axial direction of the rotating input shaft. At least one end of the first switching slider extends out of the first sliding groove, and both ends of the fixed slider extend out of the first sliding groove.

[0024] A mounting groove is formed at the proximal end of the switching sleeve, and the fixed slider is also located in the mounting groove. Both ends of the fixed slider extending out of the first sliding groove are connected to the peripheral wall of the switching sleeve through pins, thereby being supported in the mounting groove of the switching sleeve.

[0025] The distal end of the first switching slider is engaged with the proximal end of the fixed slider, so that the first switching slider can be supported in the first sliding groove for bidirectional movement along the radial direction of the rotation input shaft.

[0026] Optionally, the inner wall of the distal end of the closing sleeve is provided with at least two first stops spaced apart in the circumferential direction, the at least two first stops being staggered along the diameter, and the first stops and the first switching slider are used to form a driving connection between the switching member and the first rotation output member;

[0027] When the switching member is located at the first position, the first switching slider and the first stopper correspond to each other in the circumferential direction;

[0028] When the switching member is located at the second position, the first switching sliding block is located on the far side of the first stop block.

[0029] Optionally, the firing screw comprises a transition section and a threaded section connected in sequence and coaxially from proximal to distal, the proximal end of the transition section being sheathed with the distal end of the rotation input shaft for bidirectional rotation, and a second radially penetrating sliding groove being provided on the transition section;

[0030] The second rotation output member is a second switching slider, which is supported in a second sliding groove and can be moved radially along the firing screw, and at least one end of the second switching slider extends out of the second sliding groove;

[0031] The inner wall of the distal end of the switching sleeve is provided with at least two second stops spaced apart in the circumferential direction, and the at least two second stops are staggered along the diameter, and the second stops and the second switching slider are used to form a driving connection between the switching member and the second rotation output member;

[0032] When the switching member is located at the first position, the second stopper is located on the proximal side of the second switching slide block;

[0033] When the switching member is located at the second position, the second stop block and the second switching sliding block correspond to each other in the circumferential direction.

[0034] Optionally, the switching member includes a third switching slider;

[0035] The third switching slider is a plate-shaped member, and the rotation input shaft is provided with a first sliding groove which penetrates radially. The third switching slider is supported in the first sliding groove so as to be movable in both directions along the axial direction of the rotation input shaft, and at least one end of the third switching slider extends out of the first sliding groove.

[0036] The safety switch includes a shift block and a clamp. A groove is provided in the middle of the third switching slider. The clamp is sleeved in the groove of the third switching slider, and both ends of the clamp are fixedly connected to the shift block, thereby limiting the third switching slider in the first slide groove.

[0037] The inner wall of the distal end of the closed sleeve is provided with at least two first stops spaced apart in the circumferential direction, the at least two first stops being staggered along the diameter, the first stops and the third switching slider being used to form a driving connection between the switching member and the first rotation output member;

[0038] When the switching member is in the first position, the third switching slider and the first stopper correspond to each other in the circumferential direction;

[0039] When the switching member is located at the second position, the third switching sliding block is located on the far side of the first stop block.

[0040] Optionally, the second rotation output member is a transition sleeve, the distal end of the rotation input shaft is rotatably sleeved with the proximal end of the transition sleeve, and the transition sleeve is connected to the firing screw in a driving rotation manner;

[0041] The proximal inner wall of the transition sleeve is provided with at least two third stops evenly spaced in the circumferential direction, and the at least two third stops are staggered along the diameter. The third stops and the third switching slider are used to form a driving connection between the switching member and the second rotation output member;

[0042] When the switching member is located at the first position, the third switching slider is located near the third stopper;

[0043] When the switching member is located at the second position, the third switching slider and the third stop block correspond to each other in the circumferential direction.

[0044] Optionally, it further includes a third sleeve seat, a fourth rotating sleeve and a fifth rotating sleeve;

[0045] The third sleeve seat is fixed in the anvil bracket, the fifth rotating sleeve is placed in the third sleeve seat, the distal side of the transition sleeve is supported in the third sleeve seat by the fifth rotating sleeve for bidirectional rotation, the fourth rotating sleeve is placed in the inner hole of the transition sleeve, the distal end of the rotation input shaft passes through the fourth rotating sleeve and is used to form a bidirectional rotation support for the rotation input shaft by the fourth rotating sleeve, and the distal end of the transition sleeve is provided with a first axial socket for axially movable and circumferentially limited insertion with the proximal end of the firing screw.

[0046] Optionally, it further includes a fourth sleeve seat, a third rotating sleeve, a fourth rotating sleeve and a fifth rotating sleeve;

[0047] The fourth sleeve seat is fixed in the anvil bracket, the lower part of the fourth sleeve seat has a first sleeve hole, the fifth rotating sleeve is placed in the first sleeve hole, the distal side of the transition sleeve is supported in bidirectional rotation in the fourth sleeve seat by the fifth rotating sleeve, the fourth rotating sleeve is placed in the inner hole of the transition sleeve, the distal end of the rotation input shaft passes through the fourth rotating sleeve and is formed by the fourth rotating sleeve to form a bidirectional rotation support for the rotation input shaft, and a transition gear is provided at the connection between the distal and proximal sides of the transition sleeve;

[0048] The upper part of the fourth sleeve seat is provided with a second sleeve hole, and the third rotating sleeve is placed in the second sleeve hole. The proximal end of the firing screw passes through the third rotating sleeve and the third rotating sleeve forms a bidirectional rotation support for the firing screw. The firing shaft gear is engaged with the transition gear on the transition sleeve. The firing shaft gear is provided with a second axial socket for axially movable and circumferentially limited insertion with the proximal end of the firing screw.

[0049] (3) Beneficial effects

[0050] The beneficial effects of the present invention are as follows: the linear cutting stapler of the present invention has a power transmission mechanism including a rotating input shaft, a first rotating output member, a switching member, a second rotating output member and a safety switch; the switching member is installed on the rotating input shaft in a manner that is capable of moving between a first position and a second position and is driven to rotate with the rotating input shaft; the safety switch is connected to the switching member in a manner that is rotatable relative to the switching member and can drive the switching member to move; the first rotating output member is connected to the closing drive mechanism in a manner that is driven to rotate; the second rotating output member is connected to the firing screw in a manner that is driven to rotate; when the switching member is in the first position: the switching member is connected to the first rotating output member in a driving connection, and the switching member is separated from the second rotating output member; when the switching member is in the second position: the switching member is released from the first rotating output member, and the switching member is connected to the second rotating output member in a driving connection. Compared with the prior art, the power transmission mechanism has a high structural strength, which can ensure stable and reliable power transmission during closing and firing actions, while the overall structure is simple and the production cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 1 is an exploded view of Example 1 of the linear cutting stapler of the present invention;

[0052] Figure 2 for Figure 1 A three-dimensional schematic diagram of the closed drive mechanism, power transmission mechanism and firing screw;

[0053] Figure 3 for Figure 1 A three-dimensional schematic diagram of the closed drive mechanism, power transmission mechanism and firing screw from another perspective;

[0054] Figure 4FIG1 is a partial cross-sectional schematic diagram of Example 1 of the linear cutting stapler of the present invention, wherein the switching member is located in the first position;

[0055] Figure 5 is another partial cross-sectional schematic diagram of embodiment 1 of the linear cutting stapler of the present invention, wherein the switching member is located in the second position;

[0056] Figure 6 1 is an exploded view of Example 2 of the linear cutting stapler of the present invention;

[0057] Figure 7 for Figure 6 A three-dimensional schematic diagram of the power transmission mechanism and the firing screw;

[0058] Figure 8 FIG2 is a partial cross-sectional schematic diagram of Example 2 of the linear cutting stapler of the present invention, wherein the switching member is located in the second position;

[0059] Figure 9 1 is an exploded view of Example 3 of the linear cutting stapler of the present invention;

[0060] Figure 10 for Figure 9 A three-dimensional schematic diagram of the power transmission mechanism and the firing screw;

[0061] Figure 11 It is a partial cross-sectional schematic diagram of embodiment 3 of the linear cutting stapler of the present invention, wherein the switching member is located in the second position.

[0062] [Description of Reference Numerals]

[0063] 1: Nail cartridge assembly; 101: Nail cartridge; 102: Nail cartridge bracket; 1021: First long slot; 1022: First circular hole; 103: Anvil; 104: Anvil bracket; 1041: Long fixing ear; 1042: Short fixing ear; 105: Anvil head; 106: Firing screw; 1061: Second slide slot; 1062: Threaded segment; 1063: Transition segment; 1064: Firing shaft gear;

[0064] 107: firing nut; 1071: cutting knife; 108: connecting rod mechanism; 1081: first connecting rod; 1082: second connecting rod; 1084: fixing pin; 1085: sliding pin;

[0065] 2: Closing drive mechanism; 201: Suspension; 2011: Connecting plate; 2012: Second long slot; 2013: Second circular hole; 202: Closing screw; 203: Closing nut; 204: Second bevel gear; 205: Top bearing; 206: Bottom bearing;

[0066] 3: Power transmission mechanism; 301: Rotation input shaft; 3011: First chute; 3012: First shaft segment; 3013: Second shaft segment; 3014: Third shaft segment; 3015: Fourth shaft segment; 316: Fifth shaft segment;

[0067] 302: first rotation output member; 3021: first bevel gear; 3022: closed sleeve;

[0068] 303: switching member; 3031: first switching slider; 3032: fixed slider; 3033: switching sleeve; 3034: mounting slot; 3035: third switching slider;

[0069] 304: second rotation output member; 3041: second switching slider; 3042: transition sleeve; 3043: transition gear;

[0070] 305: safety switch; 3051: shift block; 3052: clamp; 3053: guide rod;

[0071] 306: Input shaft bearing seat; 307: First sleeve seat; 308: Second sleeve seat; 309: Screw; 310: Circlip; 311: First bearing; 312: Second bearing; 313: Flange sleeve; 314: First stopper; 315: First rotating sleeve; 316: Second rotating sleeve; 317: Third rotating sleeve; 318: Second stopper; 319: Third stopper; 320: First axial socket; 321: Third sleeve seat; 322: Fourth sleeve seat; 323: Fourth rotating sleeve; 324: Fifth rotating sleeve. DETAILED DESCRIPTION

[0072] In order to better explain the present invention and facilitate understanding, the present invention will be described in detail below with reference to the accompanying drawings and through specific embodiments.

[0073] Example 1:

[0074] Reference Figure 1 、 Figure 2 and Figure 3 This embodiment provides a linear cutting stapler, which includes a staple cartridge assembly 1 , a closing drive mechanism 2 , and a power transmission mechanism 3 .

[0075] Specifically, the staple cartridge assembly 1 includes a staple cartridge support 102 with a staple cartridge 101, an anvil support 104 with an anvil 103, a firing screw 106, and a firing nut 107 with a cutting blade 1071. An anvil head 105 is mounted at the distal end of the anvil support 104. The specific structure and operating principle of the staple cartridge assembly 1 are identical to those of the prior art, and therefore, structures not related to the movement of the closing drive mechanism 2 and power transmission mechanism 3 of the present invention are not described in detail herein.

[0076] The closing drive mechanism 2 includes a suspension 201, a closing screw 202, a closing nut 203, a second bevel gear 204, a top bearing 205, and a bottom bearing 206. The suspension 201 is in an inverted U shape, and the bottom of the suspension 201 extends distally to form a connecting plate 2011, which is fixedly connected to the proximal side of the anvil bracket 104.

[0077] The power transmission mechanism 3 includes a rotation input shaft 301, a first rotation output member 302, a switching member 303, a second rotation output member 304, a safety switch 305, an input shaft bearing seat 306, a first sleeve seat 307, a second sleeve seat 308, a first bearing 311, a first rotating sleeve 315, a second rotating sleeve 316, and a third rotating sleeve 317. The first bearing 311, the first rotation output member 302, the input shaft bearing seat 306, the first sleeve seat 307, the first rotating sleeve 315, and the second rotating sleeve 316 are located in the hanger 201, while the second rotation output member 304, the second sleeve seat 308, and the third rotating sleeve 317 are located in the anvil support 104. The proximal portion of the rotation input shaft 301 is rotatably located in the hanger 201, while the distal portion is rotatably located in the anvil support 104.

[0078] In this embodiment, the first rotational output member 302 is sleeved around the periphery of the rotational input shaft 301 and comprises a first bevel gear 3021 and a closed sleeve 3022. The inner bore of the first bevel gear 3021 has a plurality of spaced circular arc teeth, and the outer wall of the proximal end of the closed sleeve 3022 has a plurality of circular arc grooves that mesh with the plurality of circular arc teeth, thereby drivingly connecting the first bevel gear 3021 and the closed sleeve 3022. The arc-shaped tooth and groove arrangement enhances transmission strength and reduces wear on the tooth grooves.

[0079] The input shaft bearing seat 306 and the first shaft sleeve seat 307 are fixed to the suspension 201 by screws 309. The input shaft bearing seat 306 and the first shaft sleeve seat 307 are rectangular in shape. This shape enables the input shaft bearing seat 306 and the first shaft sleeve seat 307 to be more stably fixed in the suspension 201, especially when there is a mounting plane in the suspension 201 that is compatible with the input shaft bearing seat 306 and the first shaft sleeve seat 307, the input shaft bearing seat 306 and the first shaft sleeve seat 307 will not rotate unnecessary. At the same time, the rectangular bearing seat and shaft sleeve seat are also easier to fix to the suspension 201.

[0080] The first bearing 311, the first rotating sleeve 315, and the second rotating sleeve 316 are coaxial, and the first rotating output member 302 and the rotating input shaft 301 are coaxial. The second rotating sleeve 316 is placed in the first sleeve seat 307. The distal end of the closing sleeve 3022 is supported for bidirectional rotation in the first sleeve seat 307 by the second rotating sleeve 316. The proximal end of the closing sleeve 3022 and the first bevel gear 3021 are located between the input shaft bearing seat 306 and the first sleeve seat 307. The first bearing 311 is fixed in the input shaft bearing seat 306, and the first rotating sleeve 315 is placed in the inner hole of the closing sleeve 3022. The rotating input shaft 301 passes through the first bearing 311, the first rotating sleeve 315, and the closing sleeve 3022. The first bearing 311 and the first rotating sleeve 315 form bidirectional rotational support for the rotating input shaft 301. The axis of the rotating input shaft 301 is fixed by the first bearing 311 and the first rotating sleeve 315.

[0081] It should be noted that the axis of the rotating input shaft 301 is perpendicular to the closing direction and parallel to the axis of the firing screw 106, and the rotating input shaft 301 and the closing sleeve 3022 do not constitute any driving connection.

[0082] Specifically, the proximal end of the rotation input shaft 301 is used to connect to a power source capable of outputting rotation, such as a motor, to introduce the rotational power into the power transmission mechanism 3. Of course, in other embodiments, the rotation input shaft 301 can also be the output shaft of the power source itself.

[0083] Combine Figure 4 and Figure 5As shown, the rotating input shaft 301 includes, from proximal to distal, a first shaft segment 3012, a second shaft segment 3013, a third shaft segment 3014, and a fourth shaft segment 3015, which are sequentially connected and coaxial. The diameter of the first shaft segment 3012 is smaller than that of the second shaft segment 3013. A retaining spring 310 is provided at the connection between the first and second shaft segments 3012, 3013. The retaining spring 310 is fixed in an annular groove on the inner wall of the input shaft bearing seat 306. The diameter of the second shaft segment 3013 is smaller than that of the third shaft segment 3014. In other words, a first annular end surface is formed between the second and third shaft segments 3013, 3014. The first bearing 311 is axially constrained between the retaining spring 310 and the first annular end surface. The diameter of the third shaft segment 3014 is greater than the diameter of the fourth shaft segment 3015, forming a second annular end surface between the third and fourth shaft segments 3014 and 3015. The inner bore of the closed sleeve 3022 is provided with a third annular end surface, and the first rotatable sleeve 315 is axially constrained between the second and third annular end surfaces. The diameter of the proximal portion of the closed sleeve 3022 is greater than the diameter of the distal portion of the closed sleeve 3022, forming a fourth annular end surface between the proximal and distal portions of the closed sleeve 3022. An inwardly directed annular rib is provided at the distal end of the first sleeve seat 307, and the second rotatable sleeve 316 is axially constrained between the aforementioned annular rib and the fourth annular end surface.

[0084] In this embodiment, the second shaft sleeve seat 308 is fixed to the anvil bracket 104 by screws 309. The second shaft sleeve seat 308 has a rectangular shape, which can make the second shaft sleeve seat 308 more stably fixed to the anvil bracket 104, especially when there is a mounting surface in the anvil bracket 104 that is compatible with the second shaft sleeve seat 308. The second shaft sleeve seat 308 will not rotate unnecessarily. At the same time, the rectangular shaft sleeve seat is also easier to fix to the anvil bracket 104.

[0085] Specifically, the firing screw 106 includes, from proximal to distal, a sequentially connected and coaxial transition section 1063 and a threaded section 1062. The distal end of the threaded section 1062 is rotatably connected to the anvil support 104 via a flanged bushing 313. A third rotating bushing 317 is placed in the second bushing seat 308. The transition section 1063 of the firing screw 106 passes through the third rotating bushing 317 and is supported by the third rotating bushing 317 for bidirectional rotation of the firing screw 106. The axis of the firing screw 106 is fixed by the third rotating bushing 317 and the flanged bushing 313. A second bearing 312 is provided at the junction of the transition section 1063 and the threaded section 1062 of the firing screw 106. This second bearing 312 is a thrust bearing, and the diameter of the threaded section 1062 is larger than that of the transition section 1063. This means that a fifth annular end surface is formed between the threaded section 1062 and the transition section 1063. The thrust bearing is axially constrained between the fifth annular end surface and the second sleeve seat 308. An inwardly directed annular rib is provided at the proximal end of the second sleeve seat 308, and the third rotating sleeve 317 is axially constrained between this annular rib and the second bearing 312.

[0086] The distal end of the rotating input shaft 301 (i.e., the distal end of the fourth shaft segment 3015) and the proximal end of the firing screw 106 (i.e., the proximal end of the transition segment 1063) are bidirectionally rotatably socketed, that is, the proximal end of the transition segment 1063 of the firing screw 106 extends into the circular blind hole of the fourth shaft segment 3015 of the rotating input shaft 301, but there is a gap between the inner wall of the circular blind hole and the proximal end of the transition segment 1063, and the two do not constitute any driving connection.

[0087] In this embodiment, the first rotating output member 302 and the nail magazine bracket 102 are connected through the closed driving mechanism 2 to realize the conversion of the rotation of the first rotating output member 302 into the up and down movement of the nail magazine bracket 102, and the up and down movement of the nail magazine bracket 102 forms the opening and closing of the nail magazine bracket 102 and the nail anvil bracket 103.

[0088] Specifically, an input shaft bearing seat 306 is fixedly mounted at the bottom opening of the suspension 201. A mounting hole is provided on the upper wall of the input shaft bearing seat 306. The bottom bearing 206 is fixed in the mounting hole of the input shaft bearing seat 306. The bottom end of the closing screw 202 is supported on the input shaft bearing seat 306 for bidirectional rotation via the bottom bearing 206. The top bearing 205 is a thrust bearing fixed to the top of the suspension 201. The top end of the closing screw 202 is fixed to the suspension 201 via the top bearing 205. The closing nut 203 is screwed onto the closing screw 202 and is fixedly connected to the proximal end of the staple cartridge support 102. The second bevel gear 204 is sleeved onto the closing screw 202 and meshes with the first bevel gear 3021 of the first rotation output member 302. Thus, the axes of the second bevel gear 201, the closing screw 202, and the closing nut 203 are perpendicular to the axis of the first rotation output member 302. When the first rotation output member 302 rotates, the second bevel gear 204 and the closing screw 202 also rotate accordingly, causing the closing nut 203 to drive the up and down movement of the staple cartridge support 102. Of course, in other embodiments, the first rotation output member 302 can also be an ordinary transmission gear, and the corresponding closing drive mechanism 2 is subsequently used to transmit power to the staple cartridge support 102.

[0089] In this embodiment, the switching member 303 includes a first switching slider 3031, a fixed slider 3032, and a switching sleeve 3033. The switching sleeve 3033 is sleeved on the outside of the fourth shaft segment 3015 of the rotation input shaft 301 and is coaxial with the rotation input shaft 301 and the first rotation output member 302. The first sleeve seat 307 is located proximal to the switching member 303, and the second sleeve seat 308 is located distal to the switching member 303. A radially extending first guide groove 3011 is provided in the fourth shaft segment 3015 of the rotation input shaft 301. Specifically, the first guide groove 3011 extends along the diameter of the fourth shaft segment and penetrates the peripheral wall of the fourth shaft segment 3015. The first guide groove 3011 is located in the middle of the fourth shaft segment 3015. The first switching slider 3031 and the fixed slider 3032 are supported in the first chute 3011 for bidirectional movement along the axial direction of the rotation input shaft 301. At least one end of the first switching slider 3031 extends out of the first chute 3011, while both ends of the fixed slider 3032 extend out of the first chute 3011. A mounting slot 3034 is defined at the proximal end of the switching sleeve 3033. The fixed slider 3032 is positioned within the mounting slot 3034. The ends of the fixed slider 3032 extending out of the first chute 3011 are connected to the peripheral wall of the switching sleeve 3033 via pins. The distal end of the first switching slider 3031 engages the proximal end of the fixed slider 3032, allowing the first switching slider 3031 to be supported in the first chute 3011 for bidirectional movement along the radial direction of the rotation input shaft 301.

[0090] Specifically, the first switching slider 3031 and the fixed slider 3032 are plate-shaped. A T-shaped connector is provided at the distal end of the first switching slider 3031, while a T-shaped retaining hole is provided at the proximal end of the fixed slider 3032, penetrating the fixed slider 3032 along its thickness. The T-shaped connector and the T-shaped retaining hole cooperate to support the first switching slider 3031 in the first chute 3011 for bidirectional movement along the radial direction of the rotation input shaft 301. Pin holes are provided at both ends of the fixed slider 3032, extending through its thickness. The fixed slider 3032 is supported on the switching sleeve 3033 via pins passing through these pin holes. To facilitate installation of the fixed slider 3032, support holes are provided on either side of the mounting slot 3034 in the switching sleeve 3033 to facilitate pin installation. The fixed slider 3032 is configured to allow the switching sleeve 3033 to be drivenly connected to the rotation input shaft 301 while moving between a first position and a second position aligned along the axis of the rotation input shaft 301. The length of the first slot 3011 is configured to ensure that the switching member 303 is driven only with the first power output member 302 when in the first position, and only with the second power output member 304 when in the second position. In this embodiment, the first position is located proximal to the second position. Furthermore, the proximal end of the first switching slider 3031 tapers, with inclined surfaces forming on both the upper and lower surfaces of the proximal end of the first switching slider 3031.

[0091] The distal inner wall of the closing sleeve 3022 is provided with three first stops 314 evenly spaced circumferentially. Thus, the three first stops 314 are staggered along the diameter, i.e., no two first stops 314 are on the same diameter. The circumferential side surface of each first stop 314 can be used to form a push against the circumferential side surface of the first switching slider 3031, thereby forming a driving connection between the closing sleeve 3022 and the switching member 303, which can move axially relative to each other in both directions and can drive two-way rotation. In other words, when the switching member 303 is in the first position, the first switching slider 3031 extends into the closing sleeve 3022, forming a push against the circumferential side surface of the first stop 314, so as to drive the first power output member 302 to rotate. When the switching member 303 is in the second position, the first switching slider 3031 is pulled out of the closing sleeve 3022 (i.e., at this time, the closing sleeve 3022 is located proximal to the first switching slider 3031 and does not form an engagement).

[0092] Corresponding to the tapered design of the first switching slider 3031, the inner side surface of the distal end of the first stopper 314 on the closing sleeve 3022 is provided with an inclined surface that slopes distally and outwardly, with the same inclination angle as the inclined surface on the first switching slider 3031. This arrangement allows the closing sleeve 3022 to stop at a different angle after each rotation. If only one first stopper 314 were provided, the first stopper 314 might stop directly opposite the first switching slider 3031. In this way, as the switching member 303 moves toward the first position, the first switching slider 3031 would axially abut against the first stopper 314, preventing the switching member 303 from reaching the first position and forming a driving connection with the first rotation output member 302. The multiple first stops 314 staggered along the diameter of the closing sleeve 3022, combined with the first switching slider 3031, are radially movable in both directions. When the first switching slider 3031 is opposite to one of the first stops 314, as the switching sleeve 3033 moves axially, the first switching slider 3031 will be pushed radially inward by the first stop 314 opposite to it (the inclined surfaces on the first switching slider 3031 and the first stop 314 are conducive to this pushing) so as not to hinder the first switching slider 3031 from being inserted into the closing sleeve 3022 to form a driving connection with the closing sleeve 3022. The other end of the first switching slider 3031 will protrude more and better correspond circumferentially to the first stop 314 on the other side. Because the three first stops 314 are evenly spaced, while the first switching slider 3031 has only two ends, a certain distance may exist between the first switching slider 3031 and the first stops 314 corresponding to its circumferential direction. When the first switching slider 3031 initially rotates again, it will idle for a certain distance. When the first switching slider 3031 circumferentially abuts against the first stops 314, it will then push the closing sleeve 3022 to rotate. This idle distance will only cause the staple magazine support 102 and the anvil support 104 to close slightly earlier or later, but will not affect the suturing effect. Therefore, this design ensures smooth switching between the closed and fired states.

[0093] In this embodiment, a second rotation output member 304 is mounted on the transition section 1063 of the firing screw 106. The second rotation output member 304 and the switching member 303 form a selective driving connection, driving the firing screw 106 to rotate. The firing nut 107 is screwed onto the firing screw 106, thereby converting the bidirectional rotation of the firing screw 106 into bidirectional movement of the firing nut 107, thereby achieving the firing action.

[0094] Specifically, the second rotational output member 304 includes a second switching slider 3041. A second sliding groove 1061 is provided radially through the transition section 1063 of the firing screw 106. Specifically, the second sliding groove 1061 extends along the diameter of the transition section 1063 and penetrates the peripheral wall of the transition section 1063. The second sliding groove 1061 is a rectangular slot located in the middle of the transition section 1063. The second switching slider 3041 is supported within the second sliding groove 1061 for bidirectional movement along the radial direction of the transition section 1063 of the firing screw 106. At least one end of the second switching slider 3041 extends out of the second sliding groove 1061. In this embodiment, both ends of the second switching slider 3041 extend out of the second sliding groove 1061.

[0095] Specifically, the second switching slider 3041 is shaped like a plate and is provided with a strip-shaped hole (preferably an elongated hole) penetrating the second switching slider 3041 along its thickness. The length of the strip-shaped hole is radially aligned with the transition section 1063. The second switching slider 3041 is supported on the transition section 1063 of the firing screw 106 via a round rod passing through the strip-shaped hole. To facilitate installation of the second switching slider 3041, support holes are provided on both sides of the second slide groove 1061 in the transition section 1063 to facilitate installation of the round rod on the second switching slider 3041, allowing both ends of the round rod to pass through the support holes in the sidewalls of the transition section 1063. Furthermore, the proximal end of the second switching slider 3041 tapers, with inclined surfaces formed on both the upper and lower surfaces of the proximal end of the second switching slider 3041.

[0096] The inner wall of the distal end of the switching sleeve 3033 is provided with three second stops 318 evenly spaced circumferentially. The three second stops 318 are thus staggered along their diameters, i.e., no two second stops 318 are on the same diameter. The circumferential side surfaces of each second stop 318 can be used to form a push against the circumferential side surfaces of the second switching slider 3041, thereby forming a driving connection between the switching sleeve 3033 and the second rotation output member 304, which is axially movable relative to each other and can drive bidirectional rotation. In other words, when the switching member 303 is in the first position, the switching member 303 is disengaged from the second rotation output member 304 (i.e., the switching sleeve 3033 is located proximal to the second switching slider 3041 and is not engaged). When the switching member 303 is in the second position, the switching sleeve 3033 is sleeved on the second switching slider 3041, and the second stops 318 on the inner wall of the switching sleeve 3033 form a push against the circumferential side surfaces of the second switching slider 3041, which is used to drive the second power output member 304 and the firing nut 107 to rotate.

[0097] Corresponding to the tapered design of the second switching slider 3041, the inner side surface of the distal end of the second stopper 318 on the switching sleeve 3033 is provided with an inclined surface that slopes distally and outwardly, with the same inclination angle as the inclined surface on the second switching slider 3041. This arrangement ensures that the switching sleeve 3033 stops at a different angle each time it rotates to the first position. If only one second stopper 318 were provided, the second stopper 318 might stop directly opposite the second switching slider 3041. As the switching sleeve 3033 moves toward the second position, the second stopper 318 would axially abut against the second switching slider 3041, preventing the switching sleeve 3033 from reaching the second position and forming a driving connection with the second rotation output member 304. The multiple second stops 318 staggered along the diameter of the switching sleeve 3033, combined with the second switching slider 3041, are radially movable in both directions. When the second switching slider 3041 is opposite to one of the second stops 318, as the switching sleeve 3033 moves axially, the second switching slider 3041 will be pushed radially inward by the second stop 318 opposite to it (the inclined surfaces on the second switching slider 3041 and the second stop 318 are conducive to this pushing) so as not to hinder the switching sleeve 3033 from moving to the second position to form a driving connection with the second switching slider 3041. The other end of the second switching slider 3041 will protrude more and better correspond circumferentially to the second stop 318 on the other side. Because the three second stops 318 are evenly spaced, while the second switching slider 3041 has only two ends, there may be a certain distance between the second switching slider 3041 and the corresponding second stops 318. When the switching sleeve 3033 initially rotates again, it will idle for a certain distance. When the second stops 318 circumferentially abut against the second switching slider 3041, they will then push the firing screw 106 to rotate. This idle distance will only cause the ejection of the fired staples to be slightly earlier or later, but will not affect the suturing effect. Therefore, this design ensures smooth switching between the closed and fired states.

[0098] Furthermore, an annular groove is provided on the outer wall of the switching sleeve 3033. The safety switch 305 includes a shift block 3051 and a circular clamp 3052. The clamp 3052 is sleeved within the annular groove, and both ends of the clamp 3052 are fixedly connected to the shift block 3051. This allows the safety switch 305 to be rotatable relative to the switching sleeve 3033 and to drive the switching sleeve 3033 to move bidirectionally between a first position and a second position. In this embodiment, the safety switch 305 provides manual input switching power. Furthermore, a guide rod 3053 is provided between the first sleeve seat 307 and the second sleeve seat 308. The axis of the guide rod 3053 is parallel to the axis of the switching sleeve 3033. The guide rod 3053 extends through the shift block 3051 and serves as a guide for the shift block 3051.

[0099] In this embodiment, the staple cartridge assembly 1 further includes two linkage mechanisms 108 located on the left and right sides of the staple cartridge support 102. Each linkage mechanism 108 includes a first linkage 1081 and a second linkage 1082 that are hingedly connected. The first linkage 1081 and the second linkage 1082 are of equal length, and the hinge point between the first linkage 1081 and the second linkage 1082 is located at the length center of the two linkages, thereby dividing the two linkages into two downward-facing isosceles triangles.

[0100] A first long slot 1021 and a first circular hole 1022 are provided on the nail magazine bracket 102, which run through the left and right sides. A second long slot 2012 and a second circular hole 2013 are provided on the connecting plate 2011 of the suspension 201. The nail anvil bracket 104 has two symmetrical long fixing ears 1041 on the left and right and two symmetrical short fixing ears 1042 on the left and right. The long fixing ear 1041 is provided with a third long slot that coincides with the position of the second long slot 2012, and the short fixing ear 1042 is provided with a third circular hole that coincides with the second circular hole 2013.

[0101] The top ends of the first links 1081 in both linkage mechanisms 108 are hinged to the same sliding pin 1085 that passes through the first elongated slot 1021 of the magazine support 102. The bottom ends of the first links 1081 in both linkage mechanisms 108 are hinged to the second circular hole 2013 and the third circular hole of the short fixing lug 1042, respectively, via fixed pins 1084. The top ends of the second links 1082 in both linkage mechanisms 108 are hinged to the first circular hole 1022 in the magazine support 102, respectively, via fixed pins 1084. The bottom ends of the second links 1082 in both linkage mechanisms 108 are hinged to the second elongated slot 2012 and the third elongated slots of the two long fixing lugs 1031, respectively, via sliding pins 1085. With this structure, the top end of the first link 1081 is rotatable and slidable along the magazine support 102, while the bottom end of the second link 108 is rotatable and slidable along the anvil support 104. In this way, the nail magazine bracket 102 can be prevented from tilting or horizontally staggered relative to the nail anvil bracket 104 during the up and down movement, that is, the nail magazine bracket 102 and the nail anvil bracket 104 are ensured to be parallel when opening and closing, and at the same time, the pressure at the connection between the nail magazine bracket 102 and the closing nut 203 is reduced, so that the setting of the power transmission mechanism 3 can be more optimized and simplified without considering the pressure here.

[0102] Furthermore, the long fixing lug 1041 is located proximal to the second shaft sleeve 308, axially corresponding to the fourth shaft segment 3015 of the rotation input shaft 301. The connecting pin in the long fixing lug 1041 is located below the fourth shaft segment 3015. The short fixing lug 1042 is located distal to the second shaft sleeve 308. The connecting pin in the short fixing lug 1042 is located laterally below the anvil 103 on the anvil support 104. This arrangement makes the stapler's axial structure compact, reducing the stapler's size.

[0103] Of course, in other embodiments, the positions of the long fixing ear 1041 and the short fixing ear 1042 can also be interchanged, that is, the bottom end of the first connecting rod 1081 in the two sets of connecting rod mechanisms 108 is hinged to the long groove of the long fixing ear 1041 through a sliding pin, and the bottom end of the second connecting rod 1082 in the two sets of connecting rod mechanisms 108 is hinged to the second circular hole and the third circular hole of the short fixing ear 1032 through a fixing pin, the short fixing ear 1042 is located on the proximal side of the second shaft sleeve seat 308, the connecting pin in the short fixing ear 1042 is located below the fourth shaft segment 3015, and the long fixing ear 1031 is located on the distal side of the second shaft sleeve seat 308.

[0104] The "long" and "short" in the above-mentioned long fixing ears and short fixing ears are relative concepts, which only indicate the length relationship between the two and do not have any specific size restrictions.

[0105] In summary, the stapler in this embodiment can perform the following actions:

[0106] first step:

[0107] When the safety switch 305 drives the switching member 303 to move to the first position, the switching member 303 is connected to the first rotating output member 302 in a driving connection manner (that is, at this time the first switching slider 3031 of the switching member 303 is inserted into the closed shaft sleeve 3022 of the first rotating output member 302, and circumferentially corresponds to the first stop block 314 in the closed shaft sleeve 3022), the switching member 303 is separated from the second rotating output member 304 (that is, at this time the switching shaft sleeve 3033 of the switching member 303 is located on the proximal side of the second rotating output member 304 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 303, and the rotation of the switching member 303 drives the first rotating output member 302 to rotate, while the second rotating output member 304 does not rotate. The rotation of the first rotary output member 302 drives the closing screw 202 to rotate via the second bevel gear 204. The rotation of the closing screw 202 drives the closing nut 203 to move downward. The closing nut 203 drives the nail magazine support 102 to move downward until the distance from the nail anvil support 104 meets the closing requirement. During the closing process, the two sets of connecting rod mechanisms 108 close synchronously.

[0108] Among them, the circumferential correspondence formed by the first switching slider 3031 and the first stop block 314 can be that the first switching slider 3031 is in circumferential contact with the first stop block 314 when the switching member 303 is in the first position, or the first switching slider 3031 is circumferentially spaced a certain distance from the first stop block 314 when the switching member 303 is in the first position, but when the switching member 303 starts to rotate a certain angle, it will contact with the first stop block 314 and then push the closing sleeve 3022 to rotate. This situation is also a driving connection.

[0109] Step 2:

[0110] The motor stops, and the operator drives the safety switch 305 distally until the safety switch 305 drives the switching member 303 to the second position. At this point, the switching member 303 is disconnected from the first rotation output member 302 (i.e., the first switching slider 3031 of the switching member 303 is located distally of the first stopper 314 and does not circumferentially correspond to it). The switching member 303 is then drivingly connected to the second rotation output member 304 (i.e., the switching sleeve 3033 of the switching member 303 is sleeved around the outer periphery of the second switching slider 3041, and the second stopper 318 within the switching sleeve 3033 circumferentially corresponds to the second switching slider 3041).

[0111] Among them, the circumferential correspondence formed by the second stop block 318 and the second switching slider 3041 can be that the second stop block 318 is in circumferential contact with the second switching slider 3041 when the switching member 303 is in the second position, or the second stop block 318 is circumferentially spaced a certain distance from the second switching slider 3041 when the switching member 303 is in the second position, but when the switching member 303 starts to rotate a certain angle, it will contact with the second switching slider 3041 and then push the second switching slider 3041 to rotate. This situation is also a driving connection.

[0112] Step 3:

[0113] The motor is started, and the rotation of the rotary input shaft 301 is converted into the rotation of the switching member 303. The switching member 303 drives the second rotary output member 304 to rotate, while the first rotary output member 302 does not rotate. The second rotary output member 304 drives the firing screw 106 to rotate, thereby driving the firing nut 107 to move axially distally, thereby firing.

[0114] Step 4:

[0115] When the firing needs to be released, the drive motor rotates in the reverse direction (opposite to the direction in the third step), the rotation input shaft 301 rotates in the reverse direction (opposite to the direction in the third step), the switching member 303 rotates in the reverse direction (opposite to the direction in the third step), the second rotation output member 304 rotates in the reverse direction (opposite to the direction in the third step), the firing screw 106 rotates in the reverse direction (opposite to the direction in the third step), and the firing nut 107 moves proximally to return to its original position.

[0116] Step 5:

[0117] The motor is stopped and the operator drives the safety switch 305 proximally until it drives the switching member 303 to the first position. The drive motor then rotates in the opposite direction (opposite to the direction in the first step), causing the rotation input shaft 301 to rotate in the opposite direction (opposite to the direction in the first step), the switching member 303 to rotate in the opposite direction (opposite to the direction in the first step), the first rotation output member 302 to rotate in the opposite direction (opposite to the direction in the first step), the second bevel gear 204 in the closing drive mechanism 2 to rotate in the opposite direction (opposite to the direction in the first step), the closing screw 202 in the closing drive mechanism 2 to rotate in the opposite direction (opposite to the direction in the first step), the closing nut 203 in the closing drive mechanism 2 to move upward, and the staple cartridge support 102 to move upward, returning to the open state. During the opening process, the two linkage mechanisms 108 open synchronously.

[0118] Example 2:

[0119] Reference Figure 6 、 Figure 7 and Figure 8 The linear cutting stapler of this embodiment differs from that of Example 1 in that the switching member 303 is a third switching slider 3035, the second rotation output member 304 is a transition sleeve 3042, and the power transmission mechanism 3 further includes a third sleeve seat 321, a fourth rotation sleeve 323, and a fifth rotation sleeve 324. The third sleeve seat 321 replaces the second sleeve seat 308 of Example 1.

[0120] In this embodiment, the third shaft sleeve 321 is fixed to the anvil bracket 104 by screws 309. The third shaft sleeve 321 has a rectangular shape, which enables the third shaft sleeve 321 to be more stably fixed to the anvil bracket 104. In particular, when there is a mounting surface in the anvil bracket 104 that is compatible with the third shaft sleeve 321, the third shaft sleeve 321 will not rotate unnecessarily. At the same time, the rectangular shaft sleeve is also easier to fix to the anvil bracket 104.

[0121] The fourth rotating sleeve 323, the fifth rotating sleeve 324, the transition sleeve 3042, and the rotation input shaft 301 are coaxial, with the transition sleeve 3042 being sleeved around the periphery of the rotation input shaft 301. The fifth rotating sleeve 324 is positioned within the third sleeve seat 321. The distal end of the transition sleeve 3042 is supported for bidirectional rotation within the third sleeve seat 321 by the fifth rotating sleeve 324. The transition sleeve 3042 is also rotationally connected to the transition section 1063 of the firing screw 106. The fourth rotating sleeve 323 is positioned within the inner bore of the transition sleeve 3042. The distal end of the rotation input shaft 301 passes through the fourth rotating sleeve 323, providing bidirectional rotational support for the rotation input shaft 301.

[0122] The rotation input shaft 301 of this embodiment also includes a fifth shaft segment 3016. The proximal end of the fifth shaft segment 3016 is fixedly connected to the distal end of the fourth shaft segment 3015. The diameter of the fifth shaft segment 3016 is smaller than the diameter of the fourth shaft segment 3015, forming a sixth annular end surface between the fourth shaft segment 3015 and the fifth shaft segment 3016. A seventh annular end surface is defined within the inner bore of the transition sleeve 3042, and the fourth rotating sleeve 323 is axially constrained between the sixth and seventh annular end surfaces. The diameter of the proximal portion of the transition sleeve 3042 is larger than the diameter of the distal portion of the transition sleeve 3042, forming an eighth annular end surface between the proximal and distal portions of the transition sleeve 3042. The fifth rotating sleeve 324 is axially constrained between the eighth annular end surface and the second bearing 312.

[0123] The distal end of the rotating input shaft 301 (i.e., the distal side of the fourth shaft segment 3015 and the fifth shaft segment 3016) is bidirectionally rotatably sleeved with the transition sleeve 3042, i.e., the distal side of the fourth shaft segment 3015 and the fifth shaft segment 3016 extend into the circular hole of the transition sleeve 3042, but there is a gap between the inner wall of the circular hole and the distal end of the rotating input shaft 301, and the two do not constitute any driving connection.

[0124] In this embodiment, the third switching slider 3035 is a plate-shaped member. The third switching slider 3035 is supported in the first sliding groove 3011 for bidirectional movement along the axial direction of the rotation input shaft 301, and at least one end of the third switching slider 3035 extends out of the first sliding groove 3011. In this embodiment, both ends of the third switching slider 3035 extend out of the first sliding groove 3011.

[0125] A groove is defined in the middle of the third switching slider 3035, giving it a roughly "H" shape. A clamp 3052 is positioned within the groove, with both ends of the clamp 3052 fixedly connected to the shift block 3051. This allows the safety switch 305 to be rotatable relative to the third switching slider 3035 and drive the third switching slider 3035 for bidirectional movement between a first position and a second position. The clamp 3052 also constrains the third switching slider 3035 within the first guide slot 3011 and allows for bidirectional radial movement along the rotation input shaft 301. Furthermore, both the proximal and distal ends of the third switching slider 3035 taper, with inclined surfaces formed on both the proximal upper and lower surfaces, and on the distal upper and lower surfaces.

[0126] The circumferential side surfaces of each first stop block 314 of the closing sleeve 3022 can be used to form a push against the circumferential side surfaces of the third switching slider 3035, thereby forming a driving connection between the closing sleeve 3022 and the switching member 303, which can be axially moved in both directions relative to each other and can be driven to rotate in both directions. In other words, when the third switching slider 3035 is in the first position, the third switching slider 3035 extends into the closing sleeve 3022, forming a push against the circumferential side surfaces of the first stop block 314, and is used to push the first power output member 302 to rotate. When the third switching slider 3035 is in the second position, the third switching slider 3035 is pulled out of the closing sleeve 3022 (that is, at this time the closing sleeve 3022 is located on the proximal side of the third switching slider 3035 and does not form a connection).

[0127] The inclined surfaces on the upper and lower surfaces of the proximal end of the third switching slider 3035 have the same inclination angle as the outwardly inclined surface of the first stopper 314 on the closing sleeve 3022. As the third switching slider 3035 moves axially, it is pushed radially inward by the first stopper 314 directly opposite it (the inclined surfaces on the third switching slider 3035 and the first stopper 314 facilitate this pushing action), so as to ensure that the third switching slider 3035 is inserted into the closing sleeve 3022 and forms a driving connection with the closing sleeve 3022. The other end of the third switching slider 3035 protrudes further, better circumferentially corresponding to the first stopper 314 on the other side. Because the three first stops 314 are evenly spaced, while the third switching slider 3035 has only two ends, a certain distance may exist between the third switching slider 3035 and the first stops 314 corresponding to it in the circumferential direction. When the third switching slider 3035 initially rotates again with the rotation input shaft 301, it will idle for a certain distance. When the third switching slider 3035 circumferentially abuts against the first stops 314, it will further push the closing sleeve 3022 to rotate. This idle distance only causes the staple cartridge support 102 and the anvil support 104 to close slightly earlier or later, but does not affect the suturing effect. Therefore, this design ensures smooth switching between the closed and fired states.

[0128] Furthermore, the proximal inner wall of the transition sleeve 3042 includes three third stops 319 evenly spaced circumferentially. The three third stops 319 are diametrically staggered, meaning that no two third stops 319 are on the same diameter. The circumferential side surfaces of each third stop 319 can be used to abut against the circumferential side surfaces of the third switching slider 3035, thereby forming a driving connection between the third switching slider 3035 and the transition sleeve 3042, enabling axial relative bidirectional movement and bidirectional rotation. In other words, when the third switching slider 3035 is in the first position, the third switching slider 3035 is separated from the transition sleeve 3042 (i.e., the third switching slider 3035 is located proximal to the transition sleeve 3042 and is not engaged therewith). When the third switching slider 3035 is in the second position, the third switching slider 3035 extends into the transition sleeve 3042, abutting against the circumferential side surfaces of the third stops 319 to drive the transition sleeve 3042 to rotate.

[0129] Corresponding to the tapered design at the distal end of the third switching slider 3035, the inner side surface of the proximal end of the third stopper 319 on the transition sleeve 3042 is provided with an inclined surface that slopes outward toward the proximal side. This inclined surface has the same inclination angle as the inclined surface at the distal end of the third switching slider 3035. This arrangement allows the transition sleeve 3042 to stop at a different angle each time it rotates. If only one third stopper 319 were provided, the stop position of the third stopper 319 might be directly opposite the third switching slider 3035. As the third switching slider 3035 moves toward the second position, the third stopper 319 would axially abut against the third switching slider 3035, preventing the third switching slider 3035 from reaching the second position and forming a driving connection with the transition sleeve 3042. The multiple third stops 319 staggered along the diameter of the transition sleeve 3042, combined with the third switching slider 3035, are radially movable in both directions. When the third switching slider 3035 is opposite to one of the third stops 319, as the third switching slider 3035 moves axially, the third switching slider 3035 will be pushed radially inward by the third stop 319 opposite to it (the inclined surfaces on the third switching slider 3035 and the third stop 319 are conducive to this pushing) so as not to hinder the third switching slider 3035 from moving to the second position to form a driving connection with the transition sleeve 3042. The other end of the third switching slider 3035 will protrude more and better correspond circumferentially to the third stop 319 on the other side. Because the three third stops 319 are evenly spaced, while the third switching slider 3035 has only two ends, there may be a certain distance between the third switching slider 3035 and the third stops 319 corresponding to it in the circumferential direction. When the third switching slider 3035 initially rotates again, it will idle for a certain distance. When the third switching slider 3035 circumferentially abuts against the third stops 319, it pushes the transition sleeve 3042 to rotate, which in turn drives the firing screw 107 to rotate. This idle distance only causes the ejection of the fired staples to be slightly earlier or later, and does not affect the suturing effect. Therefore, this design ensures smooth switching between the closed and fired states.

[0130] In this embodiment, a first axial receptacle 320 is provided at the distal end of the transition sleeve 3042 for connection with the firing screw 106 such that bidirectional rotation of the transition sleeve 3042 is converted into bidirectional rotation of the firing screw 106. For example, the first axial receptacle 320 on the transition sleeve 3042 is a D-shaped hole, and the transition section 1063 at the proximal end of the firing screw 106 is configured as a D-shaped end. The D-shaped end and the D-shaped hole are axially connected to form a connection that enables bidirectional rotation. Preferably, the axis of the transition sleeve 3042 coincides with the axis of the firing screw 106, i.e., they are coaxial. In other embodiments, the cross-section of the transition section 1063 is not limited to a D-shape. Generally speaking, non-circular shapes can achieve both axial connection and circumferential rotational drive. In addition to the D-shape, rectangular, triangular, or gear-shaped shapes are preferably used. Accordingly, the first axial receptacle 320 on the transition sleeve 3042 can also be configured as a non-circular hole in other embodiments.

[0131] Example 3:

[0132] Reference Figure 9 、 Figure 10 and Figure 11 The linear cutting stapler of this embodiment differs from that of Example 2 in that the axis of the transition section 1063 of the firing screw 106 and the axis of the transition sleeve 3042 do not coincide, and the two are not axially plugged into a driving connection. A transition gear 3043 is provided at the junction of the proximal and distal portions of the transition sleeve 3042. The power transmission mechanism 3 also includes a fourth sleeve seat 322, and the firing screw 106 also includes a firing shaft gear 1064. The fourth sleeve seat 322 replaces the third sleeve seat 321 of Example 2.

[0133] In this embodiment, the fourth shaft sleeve 322 is fixed to the anvil bracket 104 by screws 309. The fourth shaft sleeve 322 has a rectangular shape, which enables the fourth shaft sleeve 322 to be more stably fixed to the anvil bracket 104. In particular, when there is a mounting surface in the anvil bracket 104 that is compatible with the fourth shaft sleeve 322, the fourth shaft sleeve 322 will not rotate unnecessarily. At the same time, the rectangular shaft sleeve is also easier to fix to the anvil bracket 104.

[0134] The fourth sleeve seat 322 has a first sleeve hole at its lower portion, and a fifth rotatable sleeve 324 is positioned within this first sleeve hole. The distal end of the transition sleeve 3042 is bidirectionally rotatably supported within the fourth sleeve seat 322 via the fifth rotatable sleeve 324. The fifth rotatable sleeve 324 is axially constrained between the transition gear 3043 and the second bearing 312. Furthermore, the fourth sleeve seat 322 has a second sleeve hole and an axial hole in axial communication at its upper portion. The second sleeve hole is located distally of the axial hole and has a larger diameter than the axial hole, forming a ninth annular end surface between the second sleeve hole and the axial hole. The third rotatable sleeve 317 is positioned within this second sleeve hole. The transition section 1063 of the firing screw 106 passes through the third rotatable sleeve 317, providing bidirectional rotatable support for the firing screw 106. The third rotatable sleeve 317 is axially constrained between the ninth annular end surface and the second bearing 312. The proximal end of the transition section 1063 is axially pluggably connected to the firing shaft gear 1064, which meshes with the transition gear 3043 on the transition sleeve 3042. Therefore, when the transition sleeve 3042 rotates, the firing shaft gear 1064 and the firing screw 106 also rotate, causing the firing nut 107 to move bidirectionally along the axial direction of the firing screw 106. Preferably, the axis of the transition gear 3043 is parallel to the axis of the transition sleeve 3042.

[0135] In this embodiment, the firing shaft gear 1064 is provided with a second axial receptacle for connection with the transition section 1063, such that bidirectional rotation of the firing shaft gear 1064 is converted into bidirectional rotation of the firing screw 106. For example, the second axial receptacle on the firing shaft gear 1064 is a D-shaped hole, and the transition section 1063 is configured as a D-shaped end. The D-shaped end and the D-shaped hole are axially connected to form a connection that can drive bidirectional rotation. Preferably, the axis of the firing shaft gear 1064 coincides with the axis of the firing screw 106, i.e., they are coaxial. In other embodiments, the cross-section of the transition section 1063 is not limited to a D-shape. Generally speaking, a non-circular shape can achieve both axial connection and circumferential rotational drive. In addition to the D-shape, a rectangular, triangular, or gear-shaped shape is preferably used. Accordingly, the second axial receptacle on the firing shaft gear 1064 can also be modified to other non-circular embodiments.

[0136] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0137] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may alter, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A linear cutting stapler, comprising a staple cartridge support (102), a staple anvil support (104) and a firing screw (106), characterized in that: It also includes a closing drive mechanism (2) and a power transmission mechanism (3); The closing drive mechanism (2) is connected to the nail magazine support (102) or is connected to both the nail magazine support (102) and the nail anvil support (104), and is capable of moving the nail magazine support (102) closer to or farther away from the nail anvil support (104); The power transmission mechanism (3) comprises a rotation input shaft (301), a first rotation output member (302), a switching member (303), a second rotation output member (304) and a safety switch (305); The switching member (303) is mounted on the rotation input shaft (301) in a manner that it can move between a first position and a second position and is driven to rotate with the rotation input shaft (301); the safety switch (305) is connected to the switching member (303) in a manner that it can rotate relative to the switching member (303) and can drive the switching member (303) to move; the first rotation output member (302) is connected to the closing drive mechanism (2) in a manner that it can drive rotation; and the second rotation output member (304) is connected to the firing screw (106) in a manner that it can drive rotation; When the switching member (303) is located at the first position: The switching member (303) is connected to the first rotation output member (302) in a driving connection manner, and the switching member (303) is separated from the second rotation output member (304); When the switching member (303) is located at the second position: The switching member (303) is disconnected from the first rotation output member (302), and the switching member (303) is connected to the second rotation output member (304) in a driving connection manner; The switching member (303) includes a first switching slider (3031), a fixed slider (3032) and a switching sleeve (3033); The switching sleeve (3033) is sleeved on the outside of the rotation input shaft (301); the rotation input shaft (301) is provided with a first sliding groove (3011) which is radially through; the first switching slider (3031) and the fixed slider (3032) can be supported in the first sliding groove (3011) by bidirectional movement along the axial direction of the rotation input shaft (301); at least one end of the first switching slider (3031) extends out of the first sliding groove (3011); and both ends of the fixed slider (3032) extend out of the first sliding groove (3011); A mounting groove (3034) is provided at the proximal end of the switching sleeve (3033), and the fixed slider (3032) is also located in the mounting groove (3034). Both ends of the fixed slider (3032) extending out of the first sliding groove (3011) are connected to the peripheral wall of the switching sleeve (3033) through pins, thereby being supported in the mounting groove (3034) of the switching sleeve (3033); The distal end of the first switching slider (3031) is engaged with the proximal end of the fixed slider (3032), so that the first switching slider (3031) can be supported in the first sliding groove (3011) by bidirectional movement along the radial direction of the rotation input shaft (301).

2. The linear cutting stapler according to claim 1, wherein: The first rotation output member (302) comprises a first bevel gear (3021) and a closed shaft sleeve (3022), wherein the first bevel gear (3021) is sleeved on the closed shaft sleeve (3022), and the closed shaft sleeve (3022) is sleeved on the periphery of the rotation input shaft (301); The closing drive mechanism (2) comprises a suspension (201), a closing screw (202), a closing nut (203) and a second bevel gear (204); the first bevel gear (3021) is meshed with the second bevel gear (204); the second bevel gear (204) is fixedly sleeved with one end of the closing screw (202); the other end of the closing screw (202) is rotationally connected to the suspension (201); the closing nut (203) is screwed onto the closing screw (202); and the nail magazine support (102) is sleeved on the closing nut (203).

3. The linear cutting stapler according to claim 2, wherein: Also includes: A first sleeve seat (307), a first rotating sleeve (315) and a second rotating sleeve (316); The first sleeve seat (307) is fixed on the suspension (201), the second rotating sleeve (316) is placed in the first sleeve seat (307), the proximal side of the closed sleeve (3022) is supported in bidirectional rotation in the first sleeve seat (307) by the second rotating sleeve (316), the first rotating sleeve (315) is placed in the inner hole of the closed sleeve (3022), the rotating input shaft (301) passes through the first rotating sleeve (315) and the closed sleeve (3022), and the first rotating sleeve (315) forms a bidirectional rotating support for the rotating input shaft (301); When the switching member (303) is located at the first position, it is inserted into the interior of the closing sleeve (3022), and the switching member (303) and the closing sleeve (3022) form a selective driving connection.

4. The linear cutting stapler according to claim 1, wherein: The distal inner wall of the closing sleeve (3022) is provided with at least two first stops (314) spaced apart in the circumferential direction, wherein the at least two first stops (314) are staggered along the diameter, and the first stops (314) and the first switching slider (3031) are used to form a driving connection between the switching member (303) and the first rotation output member (302); When the switching member (303) is located at the first position, the first switching slider (3031) and the first stopper (314) correspond to each other in the circumferential direction; When the switching member (303) is located at the second position, the first switching slider (3031) is located on the far side of the first stopper (314).

5. The linear cutting stapler according to claim 1, wherein: The firing screw (106) comprises a transition section (1063) and a threaded section (1062) connected in sequence and coaxially from proximal to distal, the proximal end of the transition section (1063) being sheathed with the distal end of the rotation input shaft (301) in a bidirectionally rotatable manner, and a second radially penetrating sliding groove (1061) being provided on the transition section (1063); The second rotation output member (304) is a second switching slider (3041), which can be supported in the second sliding groove (1061) by radial movement of the firing screw (106), and at least one end of the second switching slider (3041) extends out of the second sliding groove (1061); The inner wall of the distal end of the switching sleeve (3033) is provided with at least two second stops (318) spaced apart in the circumferential direction, wherein the at least two second stops (318) are staggered along the diameter, and the second stops (318) and the second switching slider (3041) are used to form a driving connection between the switching member (303) and the second rotation output member (304); When the switching member (303) is located at the first position, the second stopper (318) is located near the second switching slider (3041); When the switching member (303) is located at the second position, the second stopper (318) and the second switching slider (3041) correspond to each other in the circumferential direction.

6. The linear cutting stapler according to claim 3, wherein: The switching member (303) includes a third switching slider (3035); The third switching slider (3035) is a plate-shaped member, the rotation input shaft (301) is provided with a first sliding groove (3011) which is radially penetrating, the third switching slider (3035) can be supported in the first sliding groove (3011) in a bidirectional manner along the axial direction of the rotation input shaft (301), and at least one end of the third switching slider (3035) extends out of the first sliding groove (3011); The safety switch (305) comprises a shift block (3051) and a clamp (3052); a groove is provided in the middle of the third switching slider (3035); the clamp (3052) is sleeved in the groove of the third switching slider (3035); and both ends of the clamp (3052) are fixedly connected to the shift block (3051), thereby limiting the third switching slider (3035) in the first sliding groove (3011); The distal inner wall of the closing sleeve (3022) is provided with at least two first stops (314) spaced apart in the circumferential direction, wherein the at least two first stops (314) are staggered along the diameter, and the first stops (314) and the third switching slider (3035) are used to form a driving connection between the switching member (303) and the first rotation output member (302); When the switching member (303) is located at the first position, the third switching slider (3035) and the first stopper (314) correspond to each other in the circumferential direction; When the switching member (303) is located at the second position, the third switching slider (3035) is located on the far side of the first stopper (314).

7. The linear cutting stapler according to claim 6, wherein: The second rotation output member (304) is a transition sleeve (3042), the distal end of the rotation input shaft (301) is rotatably sleeved with the proximal end of the transition sleeve (3042), and the transition sleeve (3042) is connected to the firing screw (106) in a driving rotation manner; The proximal inner wall of the transition sleeve (3042) is provided with at least two third stops (319) evenly spaced in the circumferential direction, the at least two third stops (319) being staggered along the diameter, and the third stops (319) and the third switching slider (3035) are used to form a driving connection between the switching member (303) and the second rotation output member (304); When the switching member (303) is located at the first position, the third switching slider (3035) is located near the third stopper (319); When the switching member (303) is located at the second position, the third switching slider (3035) and the third stopper (319) correspond to each other in the circumferential direction.

8. The linear cutting stapler according to claim 7, wherein: It also includes a third shaft sleeve seat (321), a fourth rotating shaft sleeve (323) and a fifth rotating shaft sleeve (324); The third sleeve seat (321) is fixed in the anvil bracket (104), the fifth rotating sleeve (324) is placed in the third sleeve seat (321), the distal side of the transition sleeve (3042) is supported in bidirectional rotation in the third sleeve seat (321) through the fifth rotating sleeve (324), the fourth rotating sleeve (323) is placed in the inner hole of the transition sleeve (3042), the distal end of the rotation input shaft (301) passes through the fourth rotating sleeve (323) and the fourth rotating sleeve (323) forms a bidirectional rotation support for the rotation input shaft (301), the distal end of the transition sleeve (3042) is provided with a first axial socket (320) for axially movable and circumferentially limited insertion with the proximal end of the firing screw (106).

9. The linear cutting stapler according to claim 7, wherein: It also includes a fourth shaft sleeve seat (322), a third rotating shaft sleeve (317), a fourth rotating shaft sleeve (323) and a fifth rotating shaft sleeve (324); The fourth shaft sleeve seat (322) is fixed in the nail anvil bracket (104), the lower part of the fourth shaft sleeve seat (322) has a first shaft sleeve hole, the fifth rotating shaft sleeve (324) is placed in the first shaft sleeve hole, the distal side of the transition shaft sleeve (3042) is supported in bidirectional rotation in the fourth shaft sleeve seat (322) through the fifth rotating shaft sleeve (324), the fourth rotating shaft sleeve (323) is placed in the inner hole of the transition shaft sleeve (3042), the distal end of the rotation input shaft (301) passes through the fourth rotating shaft sleeve (323) and is formed by the fourth rotating shaft sleeve (323) to form a bidirectional rotation support for the rotation input shaft (301), and a transition gear (3043) is provided at the connection between the distal and proximal sides of the transition shaft sleeve (3042); The upper part of the fourth sleeve seat (322) has a second sleeve hole, and the third rotating sleeve (317) is placed in the second sleeve hole. The proximal end of the firing screw (106) passes through the third rotating sleeve (317) and the third rotating sleeve (317) forms a bidirectional rotation support for the firing screw (106). The firing shaft gear (1064) is engaged with the transition gear (3043) on the transition sleeve (3042). The firing shaft gear (1064) is provided with a second axial socket for axially movable and circumferentially limited insertion with the proximal end of the firing screw (106).

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