CN116211370A

CN116211370A - Linear type cutting anastomat

Info

Publication number: CN116211370A
Application number: CN202111460658.7A
Authority: CN
Inventors: 周丙超
Original assignee: Suzhou IntoCare Medical Technology Co Ltd
Current assignee: Suzhou IntoCare Medical Technology Co Ltd
Priority date: 2021-12-02
Filing date: 2021-12-02
Publication date: 2023-06-06

Abstract

The invention relates to a linear cutting anastomat, wherein a closing driving mechanism can enable a nail bin bracket to be close to or far away from a nail anvil bracket; the switching piece can move between a first position and a second position and is arranged on the rotation input shaft in a driving rotation mode with the rotation input shaft, the first rotation output piece is connected with the closing driving mechanism in a driving rotation mode, and the second rotation output piece is connected with the firing screw in a driving rotation mode; when the switching piece is positioned at the first position: the switching piece is connected with the first rotary output piece in a driving connection mode, and is separated from the second rotary output piece; when the switching piece is positioned at the second position: the switching piece is disconnected with the first rotary output piece, and the switching piece is connected with the second rotary output piece in a driving connection mode. The linear cutting anastomat has the advantages of low cost, simple structure and stable and reliable power transmission during closing and firing actions.

Description

Linear type cutting anastomat

Technical Field

The invention relates to the technical field of medical instruments, in particular to a linear cutting anastomat.

Background

In general surgical treatment, a linear cutting stapler is often used to perform a tissue cutting and closing function. Specifically, the distal end of the anastomat is provided with a nail bin and a nail anvil, when the nail bin and the nail anvil are separated, the tissue to be cut is placed between the nail bin and the nail anvil, the tissue is reasonably extruded by adjusting the distance between the nail bin and the nail anvil, and when the distance between the nail bin and the nail anvil reaches the safe range of effective cutting and suturing, the tissue is triggered.

In order to avoid instability and inconvenient operation of the manual closing and firing drive, electrical drives have been employed in current staplers to accomplish the driving of both the closing and firing motions, and the use of a single motor is a preferred option in order to reduce the cost of the stapler and to reduce the volume of the stapler.

The inventor of the present application expects to be able to make a linear cutting stapler to solve the power transmission problems of the closing and firing actions of the stapler.

Disclosure of Invention

First, the technical problem to be solved

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

(II) technical scheme

In order to achieve the above purpose, the main technical scheme adopted by the invention comprises the following steps:

the embodiment of the invention provides a linear cutting anastomat which comprises a nail bin bracket, a nail anvil bracket, a firing screw, a closing driving mechanism and a power transmission mechanism;

the closing driving mechanism is connected with the nail bin bracket or is simultaneously connected with the nail bin bracket and the nail anvil bracket, so that the nail bin bracket is close to or far away from the nail anvil bracket;

The power transmission mechanism comprises a rotary input shaft, a first rotary output piece, a switching piece, a second rotary output piece and a safety switch;

the switching piece can move between a first position and a second position and is arranged on the rotation input shaft in a driving rotation mode with the rotation input shaft, the safety switch is connected with the switching piece in a mode of being rotatable relative to the switching piece and capable of driving the switching piece to move, the first rotation output piece is connected with the closing driving mechanism in a driving rotation mode, and the second rotation output piece is connected with the firing screw in a driving rotation mode;

when the switching piece is positioned at the first position:

the switching piece is connected with the first rotary output piece in a driving connection mode, and is separated from the second rotary output piece;

when the switching piece is positioned at the second position:

the switching piece is disconnected with the first rotation output piece, and the switching piece is connected with the second rotation output piece in a driving connection mode.

Optionally, the first rotation output piece comprises a first bevel gear and a closed shaft sleeve, the first bevel gear is sleeved and fixed on the closed shaft sleeve, and the closed shaft sleeve is sleeved and arranged on the periphery of the rotation input shaft;

the closing driving mechanism comprises 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 rotationally connected with the suspension, the closing nut is screwed on the closing screw, and the nail bin bracket is fixedly sleeved on the closing nut.

Optionally, the method further comprises: the first shaft sleeve seat, the first rotary shaft sleeve and the second rotary shaft sleeve;

the first shaft sleeve seat is fixed on the suspension, a second rotating shaft sleeve is arranged in the first shaft sleeve seat, the near side of the closed shaft sleeve is supported in the first shaft sleeve seat through bidirectional rotation of the second rotating shaft sleeve, the first rotating shaft sleeve is arranged in an inner hole of the closed shaft sleeve, and the rotating input shaft passes through the first rotating shaft sleeve and the closed shaft sleeve and is supported through bidirectional rotation of the first rotating shaft sleeve;

the switching member is inserted into the interior of the closure sleeve when in the first position, the switching member being in selective driving connection with the closure sleeve.

Optionally, the switching piece comprises a first switching slide block, a fixed slide block and a switching shaft sleeve;

the switching shaft sleeve is sleeved outside the rotary input shaft, the rotary input shaft is provided with a first chute which is radially communicated, the first switching slide block and the fixed slide block can be supported in the first chute in a bidirectional moving way along the axial direction of the rotary input shaft, at least one end of the first switching slide block extends out of the first chute, and both ends of the fixed slide block extend out of the first chute;

the near end of the switching shaft sleeve is provided with a mounting groove, the fixed sliding block is also positioned in the mounting groove, and the two ends of the fixed sliding block extending out of the first sliding groove are connected with the peripheral wall of the switching shaft sleeve through pin shafts, so that the fixed sliding block is supported in the mounting groove of the switching shaft sleeve;

The distal end of the first switching slide block is clamped with the proximal end of the fixed slide block, so that the first switching slide block can be supported in the first sliding groove in a bidirectional moving manner along the radial direction of the rotary input shaft.

Optionally, the inner wall of the distal end of the closed shaft sleeve is provided with at least two first stop blocks which are circumferentially arranged at intervals, the at least two first stop blocks are staggered along the diameter, and the first stop blocks and the first switching sliding blocks are used for forming driving connection of the switching piece and the first rotating output piece;

when the switching piece is positioned at the first position, the first switching sliding block corresponds to the first stop block in the circumferential direction;

when the switching piece is located at the second position, the first switching sliding block is located at the far side of the first stop block.

Optionally, the firing screw comprises a transition section and a thread section which are sequentially connected and coaxial from near to far, the near end of the transition section is sleeved with the far end of the rotation input shaft in a bidirectional rotation manner, and a second chute which is radially communicated is arranged on the transition section;

the second rotary output piece is a second switching sliding block, the second switching sliding block can be movably supported in a second sliding groove along the radial direction of the firing screw, and at least one end of the second switching sliding block extends out of the second sliding groove;

the inner wall of the far end of the switching shaft sleeve is provided with at least two second stop blocks which are circumferentially arranged at intervals, the at least two second stop blocks are staggered along the diameter, and the second stop blocks and the second switching sliding blocks are used for forming driving connection of the switching piece and the second rotary output piece;

When the switching piece is positioned at the first position, the second stop block is positioned at the near side of the second switching sliding block;

when the switching piece is positioned at the second position, the second stop block corresponds to the second switching sliding block in the circumferential direction.

Optionally, the switching member includes a third switching slider;

the third switching sliding block is a plate-shaped piece, the rotary input shaft is provided with a first chute which is radially communicated, the third switching sliding block can be supported in the first chute in a bidirectional moving way along the axial direction of the rotary input shaft, and at least one end of the third switching sliding block extends out of the first chute;

the safety switch comprises a shifting block and a clamp, wherein a groove is formed in the middle of the third switching slide block, the clamp is sleeved in the groove of the third switching slide block, and two ends of the clamp are fixedly connected with the shifting block, so that the third switching slide block is limited in the first chute;

the inner wall of the far end of the closed shaft sleeve is provided with at least two first stop blocks which are circumferentially arranged at intervals, the at least two first stop blocks are staggered in diameter, and the first stop blocks and the third switching sliding blocks are used for forming driving connection of the switching piece and the first rotating output piece;

when the switching piece is positioned at the first position, the third switching sliding block corresponds to the first stop block in the circumferential direction;

when the switching piece is located at the second position, the third switching sliding block is located at the far side of the first stop block.

Optionally, the second rotary output piece is a transition shaft sleeve, the distal end of the rotary input shaft is rotatably sleeved with the proximal end of the transition shaft sleeve, and the transition shaft sleeve is connected with the firing screw in a driving and rotating manner;

the inner wall of the proximal end of the transition shaft sleeve is provided with at least two third stop blocks which are circumferentially and uniformly arranged at intervals, the at least two third stop blocks are staggered along the diameter, and the third stop blocks and the third switching sliding blocks are used for forming driving connection of the switching piece and the second rotary output piece;

when the switching piece is positioned at the first position, the third switching sliding block is positioned at the near side of the third stop block;

when the switching piece is positioned at the second position, the third switching sliding block corresponds to the third stop block in the circumferential direction.

Optionally, the device further comprises a third shaft sleeve seat, a fourth rotating shaft sleeve and a fifth rotating shaft sleeve;

the third shaft sleeve seat is fixed in the nail anvil bracket, the fifth rotary shaft sleeve is placed in the third shaft sleeve seat, the far side of the transition shaft sleeve is supported in the third shaft sleeve seat through the bidirectional rotation of the fifth rotary shaft sleeve, the fourth rotary shaft sleeve is placed in the inner hole of the transition shaft sleeve, the far end of the rotary input shaft penetrates through the fourth rotary shaft sleeve and forms bidirectional rotation support for the rotary input shaft through the fourth rotary shaft sleeve, and the far end of the transition shaft sleeve is provided with a first axial jack for being connected with the near end of the firing screw in a plugging mode that the near end of the firing screw can move axially and is limited in the circumferential direction.

Optionally, the device further comprises a fourth shaft sleeve seat, a third rotating shaft sleeve, a fourth rotating shaft sleeve and a fifth rotating shaft sleeve;

the fourth shaft sleeve seat is fixed in the nail anvil bracket, the lower part of the fourth shaft sleeve seat is provided with a first shaft sleeve hole, a fifth rotary shaft sleeve is placed in the first shaft sleeve hole, the far side of the transition shaft sleeve is supported in the fourth shaft sleeve seat through bidirectional rotation of the fifth rotary shaft sleeve, the fourth rotary shaft sleeve is placed in an inner hole of the transition shaft sleeve, the far end of the rotary input shaft penetrates through the fourth rotary shaft sleeve and is supported by the fourth rotary shaft sleeve in a bidirectional rotation way of the rotary input shaft, and a transition gear is arranged at the joint of the far side and the near side of the transition shaft sleeve;

the upper part of the fourth shaft sleeve seat is provided with a second shaft sleeve hole, the third rotating shaft sleeve is placed in the second shaft sleeve hole, the proximal end of the firing screw rod penetrates through the third rotating shaft sleeve and is supported by the third rotating shaft sleeve in a bidirectional rotating way, a firing shaft gear is meshed with a transition gear on the transition shaft sleeve, and a second shaft insertion hole is formed in the firing shaft gear and used for being inserted into the proximal end of the firing screw rod in a mode of axially moving and circumferentially limiting.

(III) beneficial effects

The beneficial effects of the invention are as follows: the linear cutting anastomat comprises a power transmission mechanism, a first rotating output part, a switching part, a second rotating output part and a safety switch, wherein the power transmission mechanism comprises a rotating input shaft; the switching piece can move between a first position and a second position and is arranged on the rotation input shaft in a driving rotation mode with the rotation input shaft, the safety switch is connected with the switching piece in a mode of being rotatable relative to the switching piece and capable of driving the switching piece to move, the first rotation output piece is connected with the closing driving mechanism in a driving rotation mode, and the second rotation output piece is connected with the firing screw in a driving rotation mode; when the switching piece is positioned at the first position: the switching piece is connected with the first rotary output piece in a driving connection mode, and is separated from the second rotary output piece; when the switching piece is positioned at the second position: the switching piece is released from being connected with the first rotary output piece, and the switching piece is connected with the second rotary output piece in a driving connection mode, and compared with the prior art, the power transmission mechanism is high in structural strength, stable and reliable in power transmission during closing and firing actions can be guaranteed, meanwhile, the whole structure is simple, and the production cost is low.

Drawings

FIG. 1 is an exploded view of embodiment 1 of the linear cutting stapler of the present invention;

FIG. 2 is a schematic perspective view of the closure drive mechanism, power transmission mechanism and firing screw of FIG. 1;

FIG. 3 is a perspective view of the closure drive mechanism, power transmission mechanism and firing screw of FIG. 1 from another perspective;

FIG. 4 is a schematic partial cross-sectional view of embodiment 1 of the linear cutting stapler of the present invention, wherein the switching member is in a first position;

FIG. 5 is another schematic partial cross-sectional view of embodiment 1 of the linear cutting stapler of the present invention, wherein the switching member is in a second position;

FIG. 6 is an exploded view of embodiment 2 of the linear cutting stapler of the present invention;

FIG. 7 is a schematic perspective view of the power transmission mechanism and firing screw of FIG. 6;

FIG. 8 is a schematic partial cross-sectional view of embodiment 2 of the linear cutting stapler of the present invention, wherein the switching member is in a second position;

FIG. 9 is an exploded view of embodiment 3 of the linear cutting stapler of the present invention;

FIG. 10 is a perspective view of the power transmission mechanism and firing screw of FIG. 9;

fig. 11 is a schematic partial cross-sectional view of embodiment 3 of the linear cutting stapler of the present invention, wherein the switching member is in a second position.

[ reference numerals description ]

1: a staple cartridge assembly; 101: a staple cartridge; 102: a cartridge holder; 1021: a first elongated slot; 1022: a first round hole; 103: a nail anvil; 104: a nail anvil bracket; 1041: a long fixed ear; 1042: short fixing lugs; 105: a nail anvil head; 106: firing the screw; 1061: a second chute; 1062: a threaded section; 1063: a transition section; 1064: a firing shaft gear;

107: firing the nut; 1071: a cutting knife; 108: a link mechanism; 1081: a first link; 1082: a second link; 1084: a fixing pin; 1085: a sliding pin;

2: closing the driving mechanism; 201: a suspension; 2011: a connecting plate; 2012: a second elongated slot; 2013: a second round hole; 202: closing the screw; 203: closing the nut; 204: a second bevel gear; 205: a top end bearing; 206: a bottom end bearing;

3: a power transmission mechanism; 301: rotating the input shaft; 3011: a first chute; 3012: a first shaft section; 3013: a second shaft section; 3014: a third shaft section; 3015: a fourth shaft section; 316: a fifth shaft section;

302: a first rotary output member; 3021: a first bevel gear; 3022: closing the shaft sleeve;

303: a switching member; 3031: a first switching slider; 3032: a fixed slide block; 3033: a switching shaft sleeve; 3034: a mounting groove; 3035: a third switching slider;

304: a second rotary output member; 3041: a second switching slider; 3042: a transition shaft sleeve; 3043: a transition gear;

305: a safety switch; 3051: a shifting block; 3052: a clamp; 3053: a guide rod;

306: an input shaft bearing seat; 307: a first bushing boss; 308: a second sleeve seat; 309: a screw; 310: clamping springs; 311: a first bearing; 312: a second bearing; 313: a flange shaft sleeve; 314: a first stopper; 315: a first rotating sleeve; 316: a second rotating sleeve; 317: a third rotary sleeve; 318: a second stopper; 319: a third stopper; 320: a first axial receptacle; 321: a third shaft sleeve seat; 322: a fourth bushing boss; 323: a fourth rotary sleeve; 324: and a fifth rotating shaft sleeve.

Detailed Description

The invention will be better explained by the following detailed description of the embodiments with reference to the drawings. Wherein, the side close to the doctor in use is the near side, and the side close to the patient is the far side.

Example 1:

referring to fig. 1, 2 and 3, the present embodiment provides a linear cutting stapler. The linear cutting anastomat comprises a nail bin assembly 1, a closing driving mechanism 2 and a power transmission mechanism 3.

Specifically, the cartridge assembly 1 includes a cartridge housing 102 with a cartridge 101, an anvil housing 104 with an anvil 103, a firing screw 106, and a firing nut 107 with a cutting knife 1071. The anvil head 105 is mounted to the distal end of the anvil bracket 104. The structure and operation of the particular cartridge assembly 1 is the same as in the prior art, and therefore the structure not associated with the movement of the closure drive mechanism 2 and the power transmission mechanism 3 of the present invention is not described in detail herein.

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

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 housing 306, a first bushing mount 307, a second bushing mount 308, a first bearing 311, a first rotation bushing 315, a second rotation bushing 316, and a third rotation bushing 317. The first bearing 311, the first rotary output 302, the input shaft bearing housing 306, the first bushing mount 307, the first rotary bushing 315, and the second rotary bushing 316 are located in the suspension 201, and the second rotary output 304, the second bushing mount 308, and the third rotary bushing 317 are located in the anvil bracket 104. The proximal portion of the rotary input shaft 301 is rotatably located in the suspension 201 and the distal portion is rotatably located in the anvil bracket 104.

In this embodiment, the first rotation output member 302 is sleeved on the outer periphery of the rotation input shaft 301, and the first rotation output member 302 includes a first bevel gear 3021 and a closed sleeve 3022. The inner hole of the first bevel gear 3021 has a plurality of circular arc teeth arranged at intervals, and the outer wall of the proximal end of the closing sleeve 3022 has a plurality of circular arc grooves engaged with the plurality of circular arc teeth, whereby the first bevel gear 3021 is in driving connection with the closing sleeve 3022. The circular arc tooth slot is matched, so that the transmission strength can be increased, and the abrasion of the tooth slot is reduced.

The input shaft bearing housing 306 and the first bushing block 307 are fixed in the suspension 201 by means of screws 309, and the input shaft bearing housing 306 and the first bushing block 307 have a rectangular shape, which enables the input shaft bearing housing 306 and the first bushing block 307 to be more stably fixed in the suspension 201, especially when there is a mounting plane in the suspension 201 that is adapted to the input shaft bearing housing 306 and the first bushing block 307, the input shaft bearing housing 306 and the first bushing block 307 do not rotate unnecessarily, and at the same time, the rectangular bearing housing and the bushing block are more easily fixed with the suspension 201.

The first bearing 311, the first rotary sleeve 315, and the second rotary sleeve 316 are coaxial, and the first rotary output member 302 and the rotary input shaft 301 are coaxial. The second rotating sleeve 316 is placed in the first sleeve mount 307, the distal end of the closing sleeve 3022 being supported in the first sleeve mount 307 by bi-directional rotation of the second rotating sleeve 316, the proximal end of the closing sleeve 3022 and the first bevel gear 3021 being located between the input shaft bearing housing 306 and the first sleeve mount 307. The first bearing 311 is fixed in the input shaft bearing housing 306, the first rotation shaft housing 315 is placed in an inner hole of the closing shaft housing 3022, the rotation input shaft 301 passes through the first bearing 311, the first rotation shaft housing 315 and the closing shaft housing 3022 and forms a bidirectional rotation support for the rotation input shaft 301 by the first bearing 311 and the first rotation shaft housing 315, and the axis of the rotation input shaft 301 is fixed by the first bearing 311 and the first rotation shaft housing 315.

It should be noted that the axis of the rotary input shaft 301 is perpendicular to the closing direction and also parallel to the axis of the firing screw 106, and the rotary input shaft 301 and the closing sleeve 3022 do not constitute any drive connection.

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, and introduce rotation power into the power transmission mechanism 3. Of course, in other embodiments, the rotary input shaft 301 may also be the output shaft of the power source itself.

As shown in connection with fig. 4 and 5, the rotary input shaft 301 includes, from near to far, a first shaft section 3012, a second shaft section 3013, a third shaft section 3014, and a fourth shaft section 3015, which are connected in order and coaxial. The diameter of the first shaft section 3012 is smaller than that of the second shaft section 3013, a clamping spring 310 is arranged at the joint of the first shaft section 3012 and the second shaft section 3013, the clamping 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 section 3013 is smaller than that of the third shaft section 3014, namely, a first annular end face is formed between the second shaft section 3013 and the third shaft section 3014, and the first bearing 311 is axially limited between the clamping spring 310 and the first annular end face. The diameter of the third shaft section 3014 is larger than that of the fourth shaft section 3015, namely a second annular end face is formed between the third shaft section 3014 and the fourth shaft section 3015, a third annular end face is arranged in an inner hole of the closed shaft sleeve 3022, and the first rotary shaft sleeve 315 is axially limited between the second annular end face and the third annular end face. The proximal portion of the closure bushing 3022 has a larger diameter than the distal portion of the closure bushing 3022, i.e. a fourth annular end surface is formed between the proximal portion of the closure bushing 3022 and the distal portion of the closure bushing 3022, the distal end of the first bushing seat 307 being provided with an inwardly directed annular abutment between which the second rotation bushing 316 is axially limited.

In this embodiment, the second bushing block 308 is secured in the anvil bracket 104 by screws 309. The second sleeve mount 308 is rectangular in shape, which allows the second sleeve mount 308 to be more stably secured within the anvil bracket 104, particularly when the anvil bracket 104 has a mounting plane that is compatible with the second sleeve mount 308, and the rectangular sleeve mount is also more easily secured to the anvil bracket 104 without unnecessary rotation of the second sleeve mount 308.

Specifically, the firing screw 106 includes, from near to far, a transition segment 1063 and a threaded segment 1062 that are connected in sequence and coaxial. The distal end of the threaded section 1062 is rotatably coupled to the anvil bracket 104 via a flange bushing 313, a third rotating bushing 317 is disposed within the second bushing mount 308, and a transition section 1063 of the firing screw 106 extends through the third rotating bushing 317 and is supported by the third rotating bushing 317 in a bi-directional rotational motion relative to the firing screw 106, with the axis of the firing screw 106 being fixed via the third rotating bushing 317 and the flange bushing 313. The junction of the transition section 1063 and the threaded section 1062 of the firing screw 106 is provided with a second bearing 312, the second bearing 312 is a thrust bearing, and the diameter of the threaded section 1062 is greater than the diameter of the transition section 1063, i.e., a fifth annular end surface is formed between the threaded section 1062 and the transition section 1063, and the thrust bearing is axially limited between the fifth annular end surface and the second bushing seat 308. The proximal end of the second hub seat 308 is provided with an inwardly directed annular flange and the third swivel hub 317 is axially confined between the annular flange and the second bearing 312.

The distal end of the rotary input shaft 301 (i.e., the distal end of the fourth shaft section 3015) is bi-directionally rotatably sleeved with the proximal end of the firing screw 106 (i.e., the proximal end of the transition section 1063), i.e., the proximal end of the transition section 1063 of the firing screw 106 extends into the circular blind bore of the fourth shaft section 3015 of the rotary input shaft 301, but the inner wall of the circular blind bore is spaced from the proximal end of the transition section 1063, which do not form any drive connection.

In this embodiment, the first rotary output member 302 is connected to the cartridge holder 102 through the closing driving mechanism 2 to convert the rotation of the first rotary output member 302 into the up-down movement of the cartridge holder 102, and the up-down movement of the cartridge holder 102 forms the opening and closing of the cartridge holder 102 and the anvil holder 103.

Specifically, an input shaft bearing seat 306 is fixedly installed at the bottom end opening of the suspension 201, a mounting hole is formed in the upper wall of the input shaft bearing seat 306, a bottom end bearing 206 is fixed in the mounting hole of the input shaft bearing seat 306, and the bottom end of the closed screw 202 is supported on the input shaft bearing seat 306 in a bidirectional rotation manner through the bottom end bearing 206. The tip bearing 205 is a thrust bearing, fixed to the top of the suspension 201, and the tip of the closing screw 202 is fixed to the suspension 201 through the tip bearing 205. A closure nut 203 is threaded onto the closure screw 202 and the closure nut 203 is fixedly attached to the proximal end of the cartridge housing 102. The second bevel gear 204 is fixed to the closing screw 202, and the second bevel gear 204 is meshed with the first bevel gear 3021 of the first rotation output member 302. Thus, the axes of the second bevel gear 201, the closure screw 202 and the closure nut 203 are perpendicular to the axis of the first rotational output member 302, and when the first rotational output member 302 rotates, the second bevel gear 204 and the closure screw 202 also rotate therewith, such that the closure nut 203 drives the cartridge holder 102 to move up and down. Of course, in other embodiments, the first rotary output 302 could also be a conventional drive gear, with the corresponding closure drive mechanism 2 subsequently utilized to transfer power to the cartridge housing 102.

In the present embodiment, the switching member 303 includes a first switching slider 3031, a fixed slider 3032, and a switching sleeve 3033. The shift sleeve 3033 is disposed outside the fourth shaft section 3015 of the rotary input shaft 301 and is coaxial with the rotary input shaft 301 and the first rotary output member 302. The first bushing seat 307 is located proximal to the switch 303 and the second bushing seat 308 is located distal to the switch 303. The fourth shaft section 3015 of the rotation input shaft 301 is provided with a first chute 3011 that is radially penetrating, i.e., the first chute 3011 is opened along the diameter direction of the fourth shaft section and penetrates the peripheral wall of the fourth shaft section 3015, and the first chute 3011 is located in the middle of the fourth shaft section 3015. The first switch block 3031 and the fixed block 3032 are supported in the first slide groove 3011 so as to be movable bi-directionally in the axial direction of the rotation input shaft 301, and at least one end of the first switch block 3031 extends out of the first slide groove 3011 and both ends of the fixed block 3032 extend out of the first slide groove 3011. The proximal end of the switching shaft sleeve 3033 is provided with a mounting groove 3034, the fixed sliding block 3032 is positioned in the mounting groove 3034, and two ends of the fixed sliding block 3032 extending out of the first chute 3011 are connected with the peripheral wall of the switching shaft sleeve 3033 through pin shafts. The distal end of the first switch block 3031 is snapped into engagement with the proximal end of the stationary block 3032 such that the first switch block 3031 is supported in the first slide 3011 for bi-directional movement in the radial direction of the rotary input shaft 301.

Specifically, the first switch block 3031 and the fixed block 3032 are shaped as plate members, the distal end of the first switch block 3031 is provided with a T-shaped connector, the proximal end of the fixed block 3032 is provided with a T-shaped clamping hole penetrating the fixed block 3032 in the thickness direction of the fixed block 3032, and the T-shaped connector is matched with the T-shaped clamping hole, so that the first switch block 3031 can be supported in the first chute 3011 in a bidirectional movement along the radial direction of the rotation input shaft 301. The fixed slider 3032 is provided at both ends extending out of the first sliding groove 3011 with pin holes penetrating the fixed slider 3032 in the thickness direction of the fixed slider 3032, and the fixed slider 3032 is supported on the switching shaft sleeve 3033 by pin shafts penetrating the pin holes. In order to facilitate the installation of the fixed slider 3032, support holes are provided at both sides of the installation groove 3034 in the switching shaft sleeve 3033, thereby facilitating the installation of the pin shaft. And the fixed slider 3032 is provided to enable the switching shaft sleeve 3033 to be drivingly connected to the rotary input shaft 301 while the switching shaft sleeve 3033 is moved between the first position and the second position aligned in the axial direction of the rotary input shaft 301; the length of the first chute 3011 enables the switching element 303 to be in driving connection with only the first power take-off 302 when in the first position and the switching element 303 to be in driving connection with only the second power take-off 304 when in the second position. In this embodiment, the first location is proximal to the second location. In addition, the proximal end of the first switch block 3031 tapers forming a chamfer on both the proximal upper and lower surfaces of the first switch block 3031.

The distal inner wall of the closure sleeve 3022 has three circumferentially equally spaced first stops 314 thereon whereby the three first stops 314 are staggered in diameter, i.e., neither first stop 314 is on the same diameter. The circumferential side of each first stop 314 may be configured to push against the circumferential side of the first switch slider 3031, thereby forming a driving connection between the closure sleeve 3022 and the switch 303 that is axially movable in opposite directions and that is capable of driving the two-way rotation, in other words, when the switch 303 is in the first position, the first switch slider 3031 protrudes into the closure sleeve 3022 and pushes against the circumferential side of the first stop 314 to push the first power output member 302 to rotate, and when the switch 303 is in the second position, the first switch slider 3031 is pulled out of the closure sleeve 3022 (i.e., when the closure sleeve 3022 is located proximal to the first switch slider 3031 and is not engaged).

Corresponding to the tapering design of the first switch block 3031, the inner side of the distal end of the first stop 314 on the closure sleeve 3022 is provided with a distally outwardly sloping ramp which is inclined at the same angle as the ramp on the first switch block 3031. The purpose of this arrangement is that the angle at which the closing sleeve 3022 stops after each rotation is different, for example, only one first stop 314 is provided, and the position at which the first stop 314 stops may be opposite to the first switch slider 3031, so that during the movement of the switch member 303 to the first position, the first switch slider 3031 will axially abut against the first stop 314, preventing the switch member 303 from reaching the first position to form a driving connection with the first rotation output member 302. The plurality of first stoppers 314 disposed along the diameter of the closing sleeve 3022 in a staggered manner are radially bi-directionally movable in combination with the first switch slider 3031, when the first switch slider 3031 is aligned with one of the first stoppers 314, the first switch slider 3031 is pushed radially inward by the first stopper 314 aligned therewith (the first switch slider 3031 and the inclined surface on the first stopper 314 facilitate the pushing) so as not to interfere with the insertion of the first switch slider 3031 into the closing sleeve 3022 to form a driving connection with the closing sleeve 3022, and the other end of the first switch slider 3031 protrudes more, and corresponds better to the circumference of the first stopper 314 on the other side. Since the three first stoppers 314 are uniformly disposed and the first switch block 3031 has only upper and lower ends, there may be a certain distance between the first switch block 3031 and the first stoppers 314 circumferentially corresponding thereto, and the first switch block 3031 idles a certain distance in the initial stage of the re-rotation of the first switch block 3031, and the closing sleeve 3022 is pushed to rotate again when the first switch block 3031 rotates to circumferentially abut against the first stoppers 314. This lost motion distance results in only a slightly earlier or later closing of the cartridge holder 102 and anvil holder 104 without affecting the stapling effect. Therefore, the design can ensure smooth switching between the closed state and the firing state.

In this embodiment, the second rotary output member 304 is mounted on the transition section 1063 of the firing screw 106, and the second rotary output member 304 and the switching member 303 form a selectively driven connection to rotate the firing screw 106. The firing nut 107 is screwed on the firing screw 106, and thus, the bidirectional rotation of the firing screw 106 is converted into the bidirectional movement of the firing nut 107, thereby realizing the firing motion.

Specifically, the second rotational output member 304 includes a second switching slider 3041. The transition section 1063 of the firing screw 106 is provided with a radially-through second sliding groove 1061, that is, the second sliding groove 1061 penetrates the peripheral wall of the transition section 1063 along the diameter direction of the transition section 1063, the second sliding groove 1061 is a rectangular groove, and the second sliding groove 1061 is located in the middle of the transition section 1063. The second switching slide 3041 is supported in the second slide 1061 in a radially bidirectional manner along the transition section 1063 of the firing screw 106, and at least one end of the second switching slide 3041 protrudes out of the second slide 1061. In this embodiment, both ends of the second switching slider 3041 extend out of the second sliding slot 1061.

Specifically, the second switching slider 3041 is shaped as a plate, and the second switching slider 3041 is provided with a bar-shaped hole (preferably a long hole) penetrating the second switching slider 3041 in the thickness direction of the second switching slider 3041, the length direction of the bar-shaped hole being along the radial direction of the transition section 1063, and the second switching slider 3041 being supported on the transition section 1063 of the firing screw 106 by a circular rod penetrating in the bar-shaped hole. For the convenience of installation of the second switching slider 3041, support holes are provided on both sides of the second sliding groove 1061 in the transition section 1063, so that the circular rod on the second switching slider 3041 is conveniently installed, and both ends of the circular rod penetrate through the support holes on the side wall of the transition section 1063. Also, the proximal end of the second switching slider 3041 is tapered, forming slopes on both the proximal upper and lower surfaces of the second switching slider 3041.

The distal inner wall of the shift collar 3033 has three circumferentially equally spaced second stops 318 whereby the three second stops 318 are staggered in diameter, i.e., neither second stop 318 is on the same diameter. The circumferential side of each second stop 318 may be configured to be in abutment with the circumferential side of the second switch slide 3041, thereby forming a driving connection between the switch sleeve 3033 and the second rotary output member 304 that is axially moveable in opposite directions and that is capable of driving bi-directional rotation, in other words, when the switch member 303 is in the first position, the switch member 303 is separated from the second rotary output member 304 (i.e., the switch sleeve 3033 is located proximal to the second switch slide 3041 and does not form an engagement), and when the switch member 303 is in the second position, the switch sleeve 3033 is sleeved on the second switch slide 3041, and the second stop 318 on the inner wall of the switch sleeve 3033 is in abutment with the circumferential side of the second switch slide 3041 for pushing the second power output member 304 and the firing nut 107 to rotate.

Corresponding to the tapered design of the second switch slide 3041, the inner side of the distal end of the second stop 318 on the switch sleeve 3033 is provided with a distally outwardly sloping ramp at the same angle as the ramp on the second switch slide 3041. The purpose of this arrangement is that the angle at which the shift sleeve 3033 stops after each rotation in the first position is different, for example, only one second stop 318 is provided, and the position at which the second stop 318 stops may be opposite to the second shift block 3041, so that during the movement of the shift sleeve 3033 to the second position, the second stop 318 will axially abut against the second shift block 3041, preventing the shift sleeve 3033 from reaching the second position to form a driving connection with the second rotational output member 304. And a plurality of second stoppers 318 staggered along the diameter of the switching sleeve 3033 are radially and bi-directionally movable in combination with the second switching slider 3041, when the second switching slider 3041 is aligned with one of the second stoppers 318, the second switching slider 3041 will be pushed radially inwards by the second stopper 318 aligned with the second switching slider 3041 (the inclined surfaces on the second switching slider 3041 and the second stopper 318 are beneficial to the pushing) along with the axial movement of the switching sleeve 3033 so as not to prevent the switching sleeve 3033 from moving to the second position to form driving connection with the second switching slider 3041, and the other end of the second switching slider 3041 will protrude more, and better corresponds to the second stopper 318 on the other side circumferentially. Since the three second stoppers 318 are uniformly disposed and the second switching slider 3041 has only upper and lower ends, there may be a certain distance between the second switching slider 3041 and the second stopper 318 circumferentially corresponding thereto, and the second stopper 318 will idle a certain distance in the initial stage of the second rotation of the switching sleeve 3033, and then push the firing screw 106 to rotate when the second stopper 318 rotates to circumferentially abut against the second switching slider 3041. This free-running distance results in a slightly earlier or later discharge of the firing staple without affecting the stapling effect. Therefore, the design can ensure smooth switching between the closed state and the firing state.

Further, on the outer wall of the switching sleeve 3033, an annular groove is provided. The safety switch 305 includes a dial 3051 and a circular collar 3052, the collar 3052 is sleeved in the annular groove, and both ends of the collar 3052 are fixedly connected with the dial 3051, thereby forming a connection of the safety switch 305 with the switching shaft sleeve 3033 in a manner rotatable relative to the switching shaft sleeve 3033 and capable of driving the switching shaft sleeve 3033 to move bi-directionally between a first position and a second position. The safety switch 305 in this embodiment provides for manual input of switching power. In addition, a guide rod 3053 is disposed between the first bushing seat 307 and the second bushing seat 308, an axis of the guide rod 3053 is parallel to an axis of the switching bushing 3033, and the guide rod 3053 penetrates the shift block 3051 to guide the shift block 3051.

In this embodiment, the cartridge assembly 1 further comprises two sets of linkages 108 on the left and right sides of the cartridge housing 102, each set of linkages 108 comprising a first link 1081 and a second link 1082 that are hinged. The first link 1081 and the second link 1082 are equal in length, and the hinge position of the first link 1081 and the second link 1082 is located at the center of the lengths of the two links, thereby dividing the two links into two isosceles triangles downward.

The nail cartridge bracket 102 is provided with a first long groove 1021 and a first round hole 1022 which are communicated left and right, the connecting plate 2011 of the suspension 201 is provided with a second long groove 2012 and a second round hole 2013 which are communicated left and right, the nail anvil bracket 104 is provided with a long fixing lug 1041 which is symmetrical left and right and a short fixing lug 1042 which is symmetrical left and right, the long fixing lug 1041 is provided with a third long groove which is overlapped with the second long groove 2012 in position, and the short fixing lug 1042 is provided with a third round hole which is overlapped with the second round hole 2013.

The top ends of the first links 1081 in the two sets of link mechanisms 108 are hinged to the same sliding pin 1085 passing through the first elongated slot 1021 on the cartridge holder 102, and the bottom ends of the first links 1081 in the two sets of link mechanisms 108 are hinged to the second circular hole 2013 and the third circular hole of the short fixing lug 1042 by fixing pins 1084, respectively. The top ends of the second links 1082 of the two sets of linkages 108 are respectively hinged to the first circular holes 1022 on the cartridge holder 102 by means of fixed pins 1084, and the bottom ends of the second links 1082 of the two sets of linkages 108 are respectively hinged to the second elongated slot 2012 and the third elongated slots of the two elongated fixing lugs 1031 by means of sliding pins 1085. With the above structure, the top end of the first link 1081 may be rotatable and slidable along the cartridge holder 102, and the bottom end of the second link 108 may be rotatable and slidable along the anvil holder 104. Therefore, the cartridge holder 102 can be prevented from tilting or being staggered horizontally relative to the anvil holder 104 in the process of moving up and down, namely, the cartridge holder 102 and the anvil holder 104 are ensured to be parallel when being opened and closed, and meanwhile, the pressure at the joint of the cartridge holder 102 and the closure nut 203 is slowed down, so that the power transmission mechanism 3 can be arranged to make more optimized and simplified designs without considering the pressure at the joint.

Further, the long fixing lug 1041 is provided at a position near the second hub seat 308 corresponding to the fourth shaft section 3015 of the rotation input shaft 301 in the axial direction, and the connecting pin in the long fixing lug 1041 is located below the fourth shaft section 3015. The short fixing lug 1042 is located at the distal side of the second sleeve seat 308, and the connecting pin in the short fixing lug 1042 is located laterally below the anvil 103 on the anvil bracket 104. The arrangement ensures that the axial structure of the anastomat is compact, and the volume of the anastomat can be reduced.

Of course, in other embodiments, the positions of the long fixing lug 1041 and the short fixing lug 1042 may be interchanged, that is, the bottom ends of the first links 1081 in the two sets of link mechanisms 108 are respectively hinged to the long slots of the long fixing lug 1041 through one sliding pin, the bottom ends of the second links 1082 in the two sets of link mechanisms 108 are hinged to the second round hole and the third round hole of the short fixing lug 1032 through a fixing pin, the short fixing lug 1042 is located at the proximal side of the second axle housing 308, the connecting pin in the short fixing lug 1042 is located below the fourth axle segment 3015, and the long fixing lug 1031 is located at the distal side of the second axle housing 308.

The "long" and "short" in the long fixing ear and the short fixing ear are a set of relative concepts, and merely represent the long-short relationship between the two, and are not limited to specific dimensions.

In summary, the anastomat in the embodiment can complete the following actions:

the first step:

when the safety switch 305 drives the switching element 303 to move to the first position, the switching element 303 is connected with the first rotating output element 302 in a driving connection manner (i.e. at this time, the first switching slider 3031 of the switching element 303 is inserted into the closed sleeve 3022 of the first rotating output element 302 and circumferentially corresponds to the first stop block 314 in the closed sleeve 3022), the switching element 303 is separated from the second rotating output element 304 (i.e. at this time, the switching sleeve 3033 of the switching element 303 is located near the second rotating output element 304 and does not form a joint), the motor is started, the rotation of the rotating input shaft 301 is converted into the rotation of the switching element 303, and the rotation of the switching element 303 drives the first rotating output element 302 to rotate, and at the same time, the second rotating output element 304 does not rotate. The rotation of the first rotation output member 302 drives the closing screw 202 to rotate through the second bevel gear 204, the rotation of the closing screw 202 drives the closing nut 203 to move downwards, and the closing nut 203 drives the cartridge bracket 102 to move downwards until the distance from the anvil bracket 104 reaches the closing requirement. During the closing process, the two sets of linkages 108 are closed simultaneously.

The first switch slider 3031 corresponds to the first stop 314 in the circumferential direction, which may be that the first switch slider 3031 is just in contact with the first stop 314 in the circumferential direction when the switch 303 is in the first position, or that the first switch slider 3031 is spaced from the first stop 314 in the circumferential direction when the switch 303 is in the first position, but when the switch 303 starts to rotate by a certain angle, the switch 303 is in contact with the first stop 314 to push the closing sleeve 3022 to rotate, which is also a driving connection.

And a second step of:

the operation of the motor is stopped and the operator drives the safety switch 305 distally until the safety switch 305 moves the switching member 303 to the second position. At this time, the switching member 303 is disconnected from the first rotary output member 302 (i.e., the first switching slider 3031 of the switching member 303 is located at the distal side of the first stopper 314 and does not circumferentially correspond to the first rotary output member), and the switching member 303 is connected to the second rotary output member 304 in a driving manner (i.e., the switching sleeve 3033 of the switching member 303 is sleeved on the outer periphery of the second switching slider 3041, and the second stopper 318 in the switching sleeve 3033 circumferentially corresponds to the second switching slider 3041).

The second stopper 318 corresponds to the second switching slider 3041 in the circumferential direction, and the second stopper 318 may abut against the second switching slider 3041 in the circumferential direction when the switching member 303 is in the second position, or the second stopper 318 may be spaced apart from the second switching slider 3041 in the circumferential direction when the switching member 303 is in the second position, but the second stopper may abut against the second switching slider 3041 to push the second switching slider 3041 to rotate after the switching member 303 starts to rotate by a certain angle, which is also the driving connection.

And a third step of:

the motor is started, the rotation of the rotation input shaft 301 is converted into the rotation of the switching member 303, the switching member 303 drives the second rotation output member 304 to rotate, and the first rotation output member 302 does not rotate. The second rotation output piece 304 drives the firing screw 106 to rotate, so that the firing nut 107 is driven to move distally along the axial direction to perform firing.

Fourth step:

when firing is desired to be released, the drive motor rotates in the reverse direction (opposite to the direction in the third step), the rotary input shaft 301 rotates in the reverse direction (opposite to the direction in the third step), the switch 303 rotates in the reverse direction (opposite to the direction in the third step), the second rotary output 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 back to the home position.

Fifth step:

stopping the motor starts, the operator drives the safety switch 305 to move proximally until the safety switch 305 drives the switching member 303 to move to the first position. The drive motor then rotates in reverse (opposite to the first step), the rotary input shaft 301 rotates in reverse (opposite to the first step), the switching member 303 rotates in reverse (opposite to the first step), the first rotary output member 302 rotates in reverse (opposite to the first step), the second bevel gear 204 in the closure drive mechanism 2 rotates in reverse (opposite to the first step), the closure screw 202 in the closure drive mechanism 2 rotates in reverse (opposite to the first step), the closure nut 203 in the closure drive mechanism 2 moves upward, the cartridge holder 102 moves upward, and the cartridge holder returns to the open state. During the opening process, the two sets of linkages 108 open synchronously.

Example 2:

referring to fig. 6, 7 and 8, the linear cutting stapler of the present embodiment is different from embodiment 1 in that the switching member 303 is a third switching slider 3035, the second rotation output member 304 is a transition shaft sleeve 3042, and the power transmission mechanism 3 further includes a third shaft sleeve seat 321, a fourth rotation shaft sleeve 323 and a fifth rotation shaft sleeve 324. Wherein the third shaft housing 321 replaces the second shaft housing 308 of embodiment 1.

In this embodiment, the third shaft socket 321 is fixed in the anvil bracket 104 by a screw 309. The third shaft sleeve 321 is rectangular in shape, and the third shaft sleeve 321 can be more stably fixed in the anvil bracket 104, especially when the anvil bracket 104 has an installation plane matched with the third shaft sleeve 321, the third shaft sleeve 321 cannot unnecessarily rotate, and meanwhile, the rectangular shaft sleeve is easier to fix with the anvil bracket 104.

The fourth rotation sleeve 323, the fifth rotation sleeve 324, the transition sleeve 3042, and the rotation input shaft 301 are coaxial, and the transition sleeve 3042 is fitted around the outer periphery of the rotation input shaft 301. The fifth rotary sleeve 324 is disposed in the third shaft housing 321, the distal end of the transition sleeve 3042 is supported in the third shaft housing 321 by the fifth rotary sleeve 324 for bi-directional rotation, and the transition sleeve 3042 is drivingly rotatably coupled to the transition section 1063 of the firing screw 106. The fourth rotation sleeve 323 is placed in the inner hole of the transition sleeve 3042, and the distal end of the rotation input shaft 301 passes through the fourth rotation sleeve 323 and is supported by the fourth rotation sleeve 323 for bidirectional rotation of the rotation input shaft 301.

The rotary input shaft 301 of the present embodiment further includes a fifth shaft section 3016, a proximal end of the fifth shaft section 3016 is fixedly connected to a distal end of the fourth shaft section 3015, and a diameter of the fifth shaft section 3016 is smaller than a diameter of the fourth shaft section 3015, that is, a sixth annular end face is formed between the fourth shaft section 3015 and the fifth shaft section 3016, a seventh annular end face is disposed in an inner hole of the transition sleeve 3042, and the fourth rotary sleeve 323 is axially limited between the sixth annular end face and the seventh annular end face. The proximal portion of the transition sleeve 3042 has a diameter that is greater than the diameter of the distal portion of the transition sleeve 3042, i.e., an eighth annular end surface is formed between the proximal portion of the transition sleeve 3042 and the distal portion of the transition sleeve 3042, and the fifth rotational sleeve 324 is axially constrained between the eighth annular end surface and the second bearing 312.

The distal end of the rotational input shaft 301 (i.e., the distal end of the fourth shaft section 3015 and the fifth shaft section 3016) is bi-directionally rotatably journaled with the transition sleeve 3042, i.e., the distal end of the fourth shaft section 3015 and the fifth shaft section 3016 extend into a circular bore of the transition sleeve 3042, but the inner wall of the circular bore is spaced from the distal end of the rotational input shaft 301, which do not form any driving connection.

In the present embodiment, the third switch slider 3035 is a plate-like member, the third switch slider 3035 is supported in the first slide groove 3011 so as to be bi-directionally movable in the axial direction of the rotation input shaft 301, and at least one end of the third switch slider 3035 protrudes out of the first slide groove 3011. In the present embodiment, both ends of the third switch slider 3035 protrude from the first slide groove 3011.

The third switch block 3035 is provided with a groove at the middle part thereof, so that the third switch block 3035 is approximately H-shaped, the clamp 3052 is sleeved in the groove, both ends of the clamp 3052 are fixedly connected with the shifting block 3051, thereby forming the safety switch 305 to be rotatably connected with the third switch block 3035 in a manner of driving the third switch block 3035 to move bi-directionally between the first position and the second position relative to the third switch block 3035, and meanwhile, the third switch block 3035 is limited in the first chute 3011 by the clamp 3052 and can be supported in the first chute 3011 in a bi-directional manner along the radial direction of the rotation input shaft 301. Further, both the proximal and distal ends of the third switch block 3035 taper, forming a chamfer on both the proximal upper and lower surfaces of the third switch block 3035 and a chamfer on both the distal upper and lower surfaces of the third switch block 3035.

The circumferential side of each first stop 314 of the closure sleeve 3022 is adapted to be pushed against the circumferential side of the third switch slider 3035, so that a driving connection is formed in which the closure sleeve 3022 is axially movable in both directions relative to the switch member 303 and is drivable in both directions, in other words, when the third switch slider 3035 is in the first position, the third switch slider 3035 protrudes into the closure sleeve 3022 and is pushed against the circumferential side of the first stop 314 for pushing the first power output member 302 to rotate, and when the third switch slider 3035 is in the second position, the third switch slider 3035 is pulled out of the closure sleeve 3022 (i.e. when the closure sleeve 3022 is located proximally of the third switch slider 3035 without engagement).

The inclined surfaces on the upper and lower surfaces of the proximal end of the third switch block 3035 are inclined at the same angle as the inclined surfaces of the first stopper 314 on the closure sleeve 3022 which are inclined outwardly. With the axial movement of the third switch slide 3035, the third switch slide 3035 is pushed radially inward by the first stop 314 against which it is facing (i.e., the inclined surfaces on the third switch slide 3035 and the first stop 314 facilitate this pushing) so as not to interfere with the insertion of the third switch slide 3035 into the closure sleeve 3022 to form a driving connection with the closure sleeve 3022, the other end of the third switch slide 3035 being more protruding, preferably corresponding circumferentially to the first stop 314 on the other side. Since the three first stoppers 314 are uniformly provided and the third switch slider 3035 has only upper and lower ends, there may be a certain distance between the third switch slider 3035 and the first stoppers 314 circumferentially corresponding thereto, and the third switch slider 3035 idles a certain distance at the initial stage of the rotation input shaft 301 again, and the closing sleeve 3022 is pushed to rotate again when the third switch slider 3035 rotates to be circumferentially pushed against the first stoppers 314. This lost motion distance results in only a slightly earlier or later closing of the cartridge holder 102 and anvil holder 104 without affecting the stapling effect. Therefore, the design can ensure smooth switching between the closed state and the firing state.

Further, the proximal inner wall of the transition sleeve 3042 has three circumferentially equally spaced third stops 319 thereon, whereby the three third stops 319 are staggered in diameter, i.e., neither third stop 319 is on the same diameter. The circumferential side of each third stop 319 can be configured to be in abutment with a circumferential side of the third switch slider 3035, thereby forming a driving connection in which the third switch slider 3035 is axially bi-directionally movable relative to the transition sleeve 3042 and is capable of driving bi-directional rotation, in other words, when the third switch slider 3035 is in the first position, the third switch slider 3035 is separated from the transition sleeve 3042 (i.e., the third switch slider 3035 is proximal to the transition sleeve 3042 without engagement), and when the third switch slider 3035 is in the second position, the third switch slider 3035 protrudes into the transition sleeve 3042 to be in abutment with the circumferential side of the third stop 319 for pushing the transition sleeve 3042 to rotate.

Corresponding to the tapered design of the distal end of the third switch block 3035, the inner side of the proximal end of the third stop 319 on the transition sleeve 3042 is provided with a slope sloping proximally outwards at the same angle as the slope on the distal end of the third switch block 3035. The purpose of this arrangement is that the angle at which the transition piece 3042 is stopped after each rotation is different, for example, only one third stop 319 is provided, and the position at which the third stop 319 is stopped may be opposite to the third switch piece 3035, so that during the movement of the third switch piece 3035 to the second position, the third stop 319 will axially abut against the third switch piece 3035, preventing the third switch piece 3035 from reaching the second position to form a driving connection with the transition piece 3042. And a plurality of third stops 319 offset along the diameter of the transition sleeve 3042, in combination with the third switch slider 3035 being radially bi-directionally movable, when the third switch slider 3035 is aligned with one of the third stops 319, the third switch slider 3035 will be pushed radially inwardly by the third stop 319 aligned therewith (the inclined surfaces on the third switch slider 3035 and the third stop 319 facilitate such pushing) as to not prevent the third switch slider 3035 from moving to the second position to form a driving connection with the transition sleeve 3042, and the other end of the third switch slider 3035 will protrude further, preferably corresponding circumferentially to the third stop 319 on the other side, as the third switch slider 3035 is axially moved. Since the three third stoppers 319 are uniformly provided and the third switch block 3035 has only upper and lower ends, there may be a certain distance between the third switch block 3035 and the third stoppers 319 circumferentially corresponding thereto, and the third switch block 3035 will idle a certain distance in the initial stage of the re-rotation, and the transition sleeve 3042 is pushed to rotate again when the third switch block 3035 rotates to circumferentially abut against the third stoppers 319, and the transition sleeve 3042 drives the firing screw 107 to rotate. This free-running distance results in a slightly earlier or later discharge of the firing staple without affecting the stapling effect. Therefore, the design can ensure smooth switching between the closed state and the firing state.

In this embodiment, a first axial receptacle 320 is provided on the distal end of the transition sleeve 3042 for connection with the firing screw 106 in a manner that translates bi-directional rotation of the transition sleeve 3042 into bi-directional rotation of the firing screw 106. For example, the first axial receptacle 320 on the transition sleeve 3042 is a D-shaped bore, 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 bore being axially pinned to form a bi-directionally rotatable connection. Preferably, the axis of the transition sleeve 3042 is coincident, i.e., coaxial, with the axis of the firing screw 106. In other embodiments, the cross-section of transition 1063 is not limited to a D-shape, and generally, a non-circular shape may provide axial mating and circumferential rotational driving. In addition to the D shape, a rectangular, triangular or gear shape is preferably employed. Accordingly, the first axial receptacle 320 on the transition sleeve 3042 may also be changed to other embodiments in non-circular holes.

Example 3:

referring to fig. 9, 10 and 11, unlike the linear cutting stapler of the present embodiment, unlike embodiment 2, the axis of the transition section 1063 of the firing screw 106 and the axis of the transition sleeve 3042 do not overlap, and are not in driving connection in an axially-inserted manner, the junction of the proximal portion and the distal portion of the transition sleeve 3042 is provided with a transition gear 3043, the power transmission mechanism 3 further includes a fourth sleeve mount 322, and the firing screw 106 further includes a firing shaft gear 1064. Wherein the fourth boss 322 replaces the third boss 321 of embodiment 2.

In this embodiment, the fourth bushing boss 322 is secured in the anvil bracket 104 by a screw 309. The fourth bushing block 322 has a rectangular shape, which enables the fourth bushing block 322 to be more stably fixed in the anvil bracket 104, especially when the anvil bracket 104 has a mounting plane adapted to the fourth bushing block 322, the fourth bushing block 322 does not unnecessarily rotate, and the rectangular bushing block is also more easily fixed to the anvil bracket 104.

The lower portion of the fourth bushing block 322 has a first bushing hole in which the fifth rotating bushing 324 is placed, and the distal end of the transition bushing 3042 is supported in the fourth bushing block 322 by bidirectional rotation of the fifth rotating bushing 324. The fifth rotating sleeve 324 is axially captured between the transition gear 3043 and the second bearing 312. And the upper part of the fourth bushing seat 322 is provided with a second bushing hole and a shaft hole which are communicated in the axial direction, the second bushing hole is positioned at the far side of the shaft hole, the diameter of the second bushing hole is larger than that of the shaft hole, namely, a ninth annular end surface is formed between the second bushing hole and the shaft hole, the third rotary bushing 317 is placed in the second bushing hole, the transition section 1063 of the firing screw 106 passes through the third rotary bushing 317 and forms bidirectional rotation support for the firing screw 106 by the third rotary bushing 317, and the third rotary bushing 317 is axially limited between the ninth annular end surface and the second bearing 312. And the proximal end of the transition section 1063 is in driving connection with the firing shaft gear 1064 in an axially inserted manner, the firing shaft gear 1064 being meshed with the transition gear 3043 on the transition sleeve 3042. Thus, as the transition sleeve 3042 rotates, the firing shaft gear 1064 and firing screw 106 also rotate, causing the firing nut 107 to move bi-directionally in 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.

In this embodiment, a second axial socket is provided on the firing shaft gear 1064 for connection with the transition piece 1063 in a manner that translates bi-directional rotation of the firing shaft gear 1064 into bi-directional rotation of the firing screw 106. For example, the second axial socket on the firing shaft gear 1064 is a D-shaped hole, and the transition segment 1063 is configured as a D-shaped end, with the D-shaped end and the D-shaped hole axially pinned to form a bi-directional rotatable connection. Preferably, the axis of the firing shaft gear 1064 is coincident, i.e., coaxial, with the axis of the firing screw 106. In other embodiments, the cross-section of transition 1063 is not limited to a D-shape, and generally, a non-circular shape may provide axial mating and circumferential rotational driving. In addition to the D shape, a rectangular, triangular or gear shape is preferably employed. Accordingly, the second axial receptacle on the firing shaft gear 1064 may also be changed to other embodiments in a non-circular bore.

In the description of the present invention, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" means two or more, unless explicitly defined otherwise

While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that alterations, modifications, substitutions and variations may be made in the above embodiments by those skilled in the art within the scope of the invention.

Claims

1. A linear cutting stapler, comprising a nail bin bracket (102), a nail anvil bracket (104) and a firing screw (106), characterized in that: the device also comprises a closing driving mechanism (2) and a power transmission mechanism (3);

the closing driving mechanism (2) is connected with the nail bin bracket (102) or is simultaneously connected with the nail bin bracket (102) and the nail anvil bracket (104) so that the nail bin bracket (102) is close to or far away from the nail anvil bracket (104);

the power transmission mechanism (3) comprises a rotary input shaft (301), a first rotary output piece (302), a switching piece (303), a second rotary output piece (304) and a safety switch (305);

the switching piece (303) is arranged on the rotation input shaft (301) in a manner of being capable of moving between a first position and a second position and being in driving rotation with the rotation input shaft (301), the safety switch (305) is connected with the switching piece (303) in a manner of being rotatable relative to the switching piece (303) and being capable of driving the switching piece (303) to move, the first rotation output piece (302) is connected with the closing driving mechanism (2) in a manner of being in driving rotation, and the second rotation output piece (304) is connected with the firing screw (106) in a manner of being in driving rotation;

When the switching member (303) is in the first position:

the switching element (303) is connected to the first rotary output element (302) in a drive-connection manner, the switching element (303) being separated from the second rotary output element (304);

when the switching member (303) is in the second position:

the switching element (303) is disconnected from the first rotary output element (302), and the switching element (303) is connected to the second rotary output element (304) in a driving manner.

2. The linear cutting stapler of claim 1, wherein: the first rotation output piece (302) comprises a first bevel gear (3021) and a closed shaft sleeve (3022), the first bevel gear (3021) is fixedly 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 driving mechanism (2) comprises a suspension (201), a closing screw (202), a closing nut (203) and a second bevel gear (204), wherein 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 with the suspension (201), the closing nut (203) is screwed on the closing screw (202), and the nail cartridge support (102) is fixedly sleeved on the closing nut (203).

3. The linear cutting stapler of claim 2, wherein: further comprises: a first bushing block (307), a first rotary bushing (315) and a second rotary bushing (316);

the first shaft sleeve seat (307) is fixed on the suspension (201), the second rotating shaft sleeve (316) is placed in the first shaft sleeve seat (307), the proximal side of the closed shaft sleeve (3022) is supported in the first shaft sleeve seat (307) through the second rotating shaft sleeve (316) in a bidirectional rotating mode, the first rotating shaft sleeve (315) is placed in an inner hole of the closed shaft sleeve (3022), and the rotating input shaft (301) penetrates through the first rotating shaft sleeve (315) and the closed shaft sleeve (3022) and is supported in a bidirectional rotating mode by the first rotating shaft sleeve (315);

the switching element (303) is inserted into the interior of the closure sleeve (3022) when in the first position, the switching element (303) forming a selectively drivable connection with the closure sleeve (3022).

4. The linear cutting stapler of claim 3, wherein: the switching piece (303) comprises a first switching slide (3031), a fixed slide (3032) and a switching shaft sleeve (3033);

the switching shaft sleeve (3033) is sleeved outside the rotary input shaft (301), the rotary input shaft (301) is provided with a first chute (3011) which is radially communicated, the first switching slide block (3031) and the fixed slide block (3032) can be supported in the first chute (3011) in a bidirectional moving way along the axial direction of the rotary input shaft (301), at least one end of the first switching slide block (3031) extends out of the first chute (3011), and both ends of the fixed slide block (3032) extend out of the first chute (3011);

The proximal end of the switching shaft sleeve (3033) is provided with a mounting groove (3034), the fixed sliding block (3032) is further positioned in the mounting groove (3034), and two ends of the fixed sliding block (3032) extending out of the first sliding groove (3011) are connected with the peripheral wall of the switching shaft sleeve (3033) through a pin shaft so as to be supported in the mounting groove (3034) of the switching shaft sleeve (3033);

the distal end of the first switch slide (3031) is clamped with the proximal end of the fixed slide (3032) so that the first switch slide (3031) can be supported in the first sliding groove (3011) in a bidirectional movement along the radial direction of the rotation input shaft (301).

5. The linear cutting stapler of claim 4, wherein: the distal end inner wall of the closing sleeve (3022) is provided with at least two first stop blocks (314) which are arranged at intervals in the circumferential direction, the at least two first stop blocks (314) are staggered in diameter, and the first stop blocks (314) and the first switching slide block (3031) are used for forming driving connection of the switching piece (303) and the first rotation output piece (302);

when the switching piece (303) is positioned at the first position, the first switching slide block (3031) and the first stop block (314) are in circumferential correspondence;

the first switch slide (3031) is distal to the first stop (314) when the switch (303) is in the second position.

6. The linear cutting stapler of claim 4, wherein: the firing screw (106) comprises a transition section (1063) and a thread section (1062) which are sequentially connected and coaxial from near to far, the proximal end of the transition section (1063) and the distal end of the rotation input shaft (301) can be in bidirectional rotation sleeve joint, and a second chute (1061) which is radially communicated is arranged on the transition section (1063);

the second rotary output piece (304) is a second switching slide block (3041), the second switching slide block (3041) can be movably supported in the second sliding groove (1061) along the radial direction of the firing screw (106), and at least one end of the second switching slide block (3041) extends out of the second sliding groove (1061);

the inner wall of the distal end of the switching shaft sleeve (3033) is provided with at least two second stop blocks (318) which are circumferentially arranged at intervals, the at least two second stop blocks (318) are staggered in diameter, and the second stop blocks (318) and the second switching sliding blocks (3041) are used for forming driving connection of the switching piece (303) and the second rotary output piece (304);

when the switching piece (303) is positioned at the first position, the second stop block (318) is positioned at the near side of a second switching sliding block (3041);

when the switching piece (303) is located at the second position, the second stop block (318) and the second switching sliding block (3041) are circumferentially corresponding.

7. The linear cutting stapler of claim 3, wherein: the switch (303) comprises a third switch slider (3035);

the third switching slide block (3035) is a plate-shaped piece, the rotation input shaft (301) is provided with a first chute (3011) which is penetrated in the radial direction, the third switching slide block (3035) can be supported in the first chute (3011) in a bidirectional moving way along the axial direction of the rotation input shaft (301), and at least one end of the third switching slide block (3035) extends out of the first chute (3011);

the safety switch (305) comprises a shifting block (3051) and a clamp (3052), wherein a groove is formed in the middle of the third switching slide block (3035), the clamp (3052) is sleeved in the groove of the third switching slide block (3035), and two ends of the clamp (3052) are fixedly connected with the shifting block (3051), so that the third switching slide block (3035) is limited in the first chute (3011);

the distal end inner wall of the closing sleeve (3022) is provided with at least two first stop blocks (314) which are arranged at intervals in the circumferential direction, the at least two first stop blocks (314) are staggered in diameter, and the first stop blocks (314) and the third switching slide blocks (3035) are used for forming driving connection of the switching piece (303) and the first rotation output piece (302);

When the switching piece (303) is positioned at the first position, the third switching slide block (3035) corresponds to the first stop block (314) in the circumferential direction;

the third switch slide (3035) is distal to the first stop (314) when the switch (303) is in the second position.

8. The linear cutting stapler of claim 7, wherein: the second rotation output piece (304) is a transition shaft sleeve (3042), the distal end of the rotation input shaft (301) is rotatably sleeved with the proximal end of the transition shaft sleeve (3042), and the transition shaft sleeve (3042) is connected with the firing screw (106) in a driving rotation mode;

the proximal end inner wall of the transition shaft sleeve (3042) is provided with at least two third stop blocks (319) which are uniformly arranged at intervals along the circumferential direction, the at least two third stop blocks (319) are staggered along the diameter, and the third stop blocks (319) and the third switching slide block (3035) are used for forming driving connection of the switching piece (303) and the second rotation output piece (304);

the third switch slide (3035) is proximal to the third stop (319) when the switch (303) is in the first position;

when the switching piece (303) is located at the second position, the third switching slide block (3035) and the third stop block (319) are in circumferential correspondence.

9. The linear cutting stapler of claim 8, wherein: the device also comprises a third shaft sleeve seat (321), a fourth rotary shaft sleeve (323) and a fifth rotary shaft sleeve (324);

the third shaft sleeve seat (321) is fixed in the nail anvil bracket (104), the fifth rotating shaft sleeve (324) is placed in the third shaft sleeve seat (321), the far side of the transition shaft sleeve (3042) is supported in the third shaft sleeve seat (321) through the bidirectional rotating of the fifth rotating shaft sleeve (324), the fourth rotating shaft sleeve (323) is placed in an inner hole of the transition shaft sleeve (3042), the far end of the rotating input shaft (301) penetrates through the fourth rotating shaft sleeve (323) and forms bidirectional rotating support for the rotating input shaft (301) through the fourth rotating shaft sleeve (323), and a first axial insertion hole (320) is formed in the far end of the transition shaft sleeve (3042) and used for being axially movable and circumferentially limited in insertion connection with the near end of the firing screw (106).

10. The linear cutting stapler of claim 8, wherein: the device further comprises a fourth shaft sleeve seat (322), a third rotary shaft sleeve (317), a fourth rotary shaft sleeve (323) and a fifth rotary shaft sleeve (324);

the fourth shaft sleeve seat (322) is fixed in the nail anvil bracket (104), a first shaft sleeve hole is formed in the lower part of the fourth shaft sleeve seat (322), the fifth rotary shaft sleeve (324) is placed in the first shaft sleeve hole, the far side of the transition shaft sleeve (3042) is supported in the fourth shaft sleeve seat (322) through the fifth rotary shaft sleeve (324) in a bidirectional rotating way, the fourth rotary shaft sleeve (323) is placed in an inner hole of the transition shaft sleeve (3042), the far end of the rotary input shaft (301) passes through the fourth rotary shaft sleeve (323) and is supported by the fourth rotary shaft sleeve (323) in a bidirectional rotating way, and a transition gear (3043) is arranged at the joint of the far side and the near side of the transition shaft sleeve (3042);

The upper portion of fourth axle sleeve seat (322) has the second axle sleeve hole, third rotation axle sleeve (317) are placed in the second axle sleeve hole, the proximal end of firing screw (106) pass third rotation axle sleeve (317) and by third rotation axle sleeve (317) form to the bidirectional rotation support of firing screw (106), firing axle gear (1064) with transition gear (3043) on transition axle sleeve (3042) meshing, be equipped with the second axial jack on firing axle gear (1064) for but with proximal end axial displacement and the spacing grafting of circumference of firing screw (106).