Drive mechanism and medical stapler

Abstract

This invention provides a driving mechanism and a medical stapler. The driving mechanism includes: a staple cartridge housing connected between the staple head and the stapler body; a firing rod, at least partially located inside the staple cartridge housing and extending axially along the stapler body into the staple head; an inner connecting member including a fixing part, a deforming part, and a limiting part arranged sequentially from the distal to the proximal side; and an outer connecting member including a first outer sleeve, a second outer sleeve, and a third outer sleeve. The fixing part and the first outer sleeve are fixedly connected to the proximal side of the staple head, and the limiting part and the third outer sleeve are fixedly connected to the distal side of the staple cartridge housing. The inner and outer connecting members define a first channel through which the firing rod passes. When the staple head swings, the firing rod swings with the staple head, and the deforming part and the second outer sleeve deform at least partially with the swing of the staple head. This invention connects the staple head to the staple cartridge housing by providing inner and outer connecting members and limits the deformation of the firing rod.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a drive mechanism and a medical stapler. Background Technology

[0002] A medical stapler generally includes a stapler body and a staple head. A staple cartridge housing is located at the distal end of the stapler body, and the staple head is mounted at the distal end of the staple cartridge housing. A firing lever extending axially along the staple cartridge housing is disposed inside the staple cartridge housing, with its distal end extending into the staple head. When the stapler is fired, the firing lever is driven by a firing handle located on the stapler body to move towards the distal end of the stapler. Under the drive of the firing lever, the staple head can cut and suture the tissue.

[0003] In existing technologies, to achieve more operating angles, the nail head can be configured to swing relative to the nail cartridge housing. When the nail head swings, it causes the firing rod to swing as well, resulting in a certain degree of bending. However, the bending deformation of the firing rod is difficult to control accurately. Furthermore, existing firing rods are generally formed by stacking multiple pusher blades. When the firing rod bends, the stacked pusher blades open outwards at the bending point, causing significant deformation of the firing rod and increasing the firing force, which can easily lead to surgical failure.

[0004] In this invention, the distal side and the proximal side are relative to the operator. The end closer to the operator is the proximal side, and the end farther from the operator, that is, the end closer to the surgical position, is the distal side. Summary of the Invention

[0005] In view of the problems in the prior art, the present invention aims to provide a driving mechanism and a medical stapler, which connects the staple head to the staple cartridge shell by setting an inner connector and an outer connector, and limits the deformation of the firing rod.

[0006] This invention provides a driving mechanism for a medical stapler, the medical stapler including a stapler body and a staple head located at the distal end of the stapler body; the driving mechanism includes:

[0007] The staple cartridge housing is connected between the staple head and the stapler body;

[0008] A firing lever, at least partially located inside the staple cartridge housing, and extending axially along the stapler body into the staple head;

[0009] The internal connector includes a fixing part, a deforming part, and a limiting part arranged sequentially from the distal end to the proximal end;

[0010] The external connector includes a first outer sleeve, a second outer sleeve, and a third outer sleeve respectively fitted onto the outside of the fixing part, the deforming part, and the limiting part;

[0011] The fixing part and the first outer sleeve part are fixedly connected to the proximal end of the nail head, and the limiting part and the third outer sleeve part are fixedly connected to the distal end of the nail box shell.

[0012] The inner connector and the outer connector together define an axially extending first channel. The firing rod passes through the first channel. When the nail head swings axially relative to the stapler body, the firing rod swings with the nail head. The deformable part and the second outer sleeve deform at least partially with the swing of the nail head.

[0013] In some embodiments, when the staple head swings axially toward a first side relative to the stapler body, at least a portion of the first side of the deformable portion and the second outer sleeve undergoes compressive deformation, and at least a portion of the second side of the deformable portion and the second outer sleeve undergoes tensile deformation.

[0014] When the staple head swings axially toward the second side relative to the stapler body, at least part of the first side of the deformable part and the second outer sleeve undergoes tensile deformation, and at least part of the second side of the deformable part and the second outer sleeve undergoes compressive deformation.

[0015] In some embodiments, the nail head includes a nail cartridge holder, a pin hole is provided at the distal end of the fixing part, the pin hole protrudes outside the first outer sleeve part, and the fixing part and the nail cartridge holder are connected by a connecting pin that at least partially enters the pin hole.

[0016] In some embodiments, a retaining sleeve is provided on the proximal side of the staple cartridge, and the retaining portion at least partially enters the interior of the retaining sleeve.

[0017] In some embodiments, the fixing portion of the inner connector and the first outer sleeve portion of the outer connector are connected by at least one fixing pin.

[0018] In some embodiments, the drive mechanism further includes an axially extending swivel rod, with one of the fixing pins passing through the fixing portion, the first outer sleeve portion, and the distal end of the swivel rod.

[0019] In some embodiments, a second channel is provided on one side of the outer connector, and a third channel is provided on the inner connector opposite to the second channel, with the swing head rod passing through the second channel and the third channel.

[0020] In some embodiments, the second channel is provided with an outwardly recessed relief groove at the position corresponding to the distal end of the swing head rod, and a fixing hole is provided in the relief groove, and a fixing pin passes through both the fixing hole and the distal end of the swing head rod.

[0021] In some embodiments, the inner connector includes a first inner connector and a second inner connector, the first inner connector being located on the side of the second inner connector away from the bottom surface of the nail head, the first inner connector including a first fixing part, a first deformable part and a first limiting part, and the second inner connector including a second fixing part, a second deformable part and a second limiting part;

[0022] The first fixing part, the second fixing part, and the first outer sleeve part are fixedly connected to the proximal side of the nail head by the fixing pin.

[0023] In some embodiments, the defining portion of the inner connector and the third outer sleeve portion of the outer connector are connected to the distal end of the nail box housing by at least one limiting pin.

[0024] In some embodiments, a cutter is provided on the proximal side of the nail head, and a cutter groove is provided on the distal side of the fixing part. The cutter groove is connected to the first channel, and in the initial state, the cutter part enters the cutter groove.

[0025] In some embodiments, the deformable portion has a plurality of first grooves, and the second outer sleeve portion has a plurality of second grooves.

[0026] In some embodiments, the first groove is an arc groove that radiates outward from the central axis of the deformed part, or the first groove extends in the lateral direction, and the ends of the plurality of first grooves are independent free ends. The first groove has a first width near the axis and a second width away from the axis, and the first width is greater than the second width.

[0027] The second groove is an arc groove that radiates outward from the central axis of the second outer sleeve, or the second groove extends in the lateral direction. The ends of the plurality of second grooves are independent free ends. The second groove has a third width near the axis and a fourth width away from the axis. The fourth width is greater than the third width.

[0028] The ends of the plurality of first grooves are oriented in the opposite direction to the ends of the plurality of second grooves.

[0029] In some embodiments, the upper and / or lower sides of the second outer sleeve are provided with axially extending insert grooves, and the deformable portion is provided with an insert portion that is embedded in the insert groove, the shape of the insert portion being adapted to the shape of the insert groove; or...

[0030] The upper and / or lower sides of the deformable part are provided with axially extending embedding grooves, and the second outer sleeve is provided with an embedding part that is embedded in the embedding groove, the shape of the embedding part being adapted to the shape of the embedding groove.

[0031] In some embodiments, the second groove is provided on both sides of the embedding groove, and the third groove is provided on the left and right sides of the second outer sleeve.

[0032] The ends of the plurality of third grooves are independent free ends. The third groove has a fifth width near the axis and a sixth width away from the axis, and the fifth width is greater than the sixth width.

[0033] In some embodiments, when the staple head swings axially relative to the stapler body, the firing rod swings with the staple head, the limiting portion does not deform, or the deformation of the limiting portion is less than the deformation of the deformable portion.

[0034] In some embodiments, the first inner connector is provided with a first limiting hole, the second inner connector is provided with a second limiting hole, and the limiting pin is fixedly connected to the first limiting hole and the second limiting hole.

[0035] In some embodiments, the third outer sleeve of the outer connector is provided with an axially extending first limiting groove, and the limiting pin is located in the first limiting groove and is movable along the axial direction.

[0036] In some embodiments, the first inner connector is provided with a second limiting groove, the second inner connector is provided with a third limiting groove, the limiting pin is movably connected to the second limiting groove and the third limiting groove, the third outer sleeve of the outer connector is provided with a first limiting groove extending axially, and the limiting pin is movably disposed in the first limiting groove, the second limiting groove and the third limiting groove.

[0037] In some embodiments, the cross-section of the limiting pin is waist-shaped, and the major axis of the waist shape is parallel to the axial direction;

[0038] The first limiting groove, the second limiting groove and the third limiting groove have waist-shaped cross sections and the major axis of the waist shape is parallel to the axial direction;

[0039] The second limiting groove and the third limiting groove are the same size and shape. The first limiting groove has a first axial length, and the second limiting groove and the third limiting groove have a second axial length. The first axial length is greater than the second axial length.

[0040] In some embodiments, a fixing groove is provided on the inner side of the nail box shell, and the limiting part and the third outer sleeve part are embedded in the fixing groove;

[0041] The bottom of the fixing groove of the nail box shell is provided with a nail box hole, and the limiting pin is at least partially inserted into the nail box hole.

[0042] In some embodiments, the fixing groove includes a first fixing groove and a second fixing groove, the limiting portion and the third outer sleeve portion enter the first fixing groove, the deformable portion and the second outer sleeve portion at least partially enter the second fixing groove, the width of the second fixing groove is greater than the width of the first fixing groove, and there is a first gap between the outer sidewall of the second outer sleeve portion and the inner sidewall of the second fixing groove.

[0043] In some embodiments, the defining portion includes a connecting portion and a reinforcing portion, the connecting portion being connected between the reinforcing portion and the deformable portion, and the lateral width of the reinforcing portion being greater than the lateral width of the connecting portion.

[0044] In some embodiments, a lubrication structure is provided between the inner connector and / or the outer connector.

[0045] In some embodiments, the inner connector and / or the outer connector are made of different materials.

[0046] This invention also provides a medical stapler, including the aforementioned drive mechanism.

[0047] The drive mechanism and medical stapler provided by this invention have the following advantages:

[0048] This invention provides a drive mechanism for a medical stapler. By providing an inner connector and an outer connector, the staple head is connected to the staple cartridge housing. The inner connector includes a deformation portion and a limiting portion. When the staple head swings relative to the stapler body, the firing rod also bends with the swing of the staple head. The deformation portion also bends in the same direction, generating deformation. The deformation portion and the limiting portion provide a restraining effect on the firing rod during bending, preventing excessive deformation and effectively limiting the deformation of the firing rod. Furthermore, when the firing rod is composed of multiple stacked pusher blades, the restraining effect of the deformation portion and the limiting portion prevents the multiple pusher blades from spreading outwards when the firing rod bends, improving surgical outcomes. Attached Figure Description

[0049] Other features, objects, and advantages of the invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0050] Figure 1This is a schematic diagram of the structure of the drive mechanism and the nail head in the first embodiment of the present invention;

[0051] Figure 2 yes Figure 1 The diagram below omits the anvil casing and the staple cartridge rack.

[0052] Figure 3 and Figure 4 This is a schematic diagram of the connector structure according to the first embodiment of the present invention;

[0053] Figure 5 This is a schematic diagram of the structure of the connector, firing rod, and swing rod in the first embodiment of the present invention.

[0054] Figure 6 This is an exploded view of the connection member and firing rod in the first embodiment of the present invention.

[0055] Figure 7 This is an exploded view of the connection between the connector and the swing head tie rod according to the first embodiment of the present invention;

[0056] Figure 8 This is a schematic diagram of the structure of the external connector according to the first embodiment of the present invention;

[0057] Figure 9 This is a schematic diagram of the structure of the first inner connector according to the first embodiment of the present invention;

[0058] Figure 10 This is a schematic diagram of the structure of the inner connector according to the first embodiment of the present invention;

[0059] Figure 11 This is a schematic diagram of the drive mechanism according to the first embodiment of the present invention;

[0060] Figure 12 This is a schematic diagram of the drive mechanism of the first embodiment of the present invention, omitting the connecting rod;

[0061] Figure 13 This is a schematic diagram of the connection between the connector and the second nail box housing according to the first embodiment of the present invention;

[0062] Figure 14 This is a schematic diagram of the structure of the second nail box shell according to the first embodiment of the present invention;

[0063] Figure 15 This is a schematic diagram of the connector structure according to the second embodiment of the present invention;

[0064] Figure 16 This is an exploded view of the connector and firing lever in the second embodiment of the present invention;

[0065] Figure 17 This is a schematic diagram of the structure of the external connector according to the second embodiment of the present invention;

[0066] Figure 18 This is a schematic diagram of the connector according to the third embodiment of the present invention;

[0067] Figure 19 This is an exploded view of the connector according to the third embodiment of the present invention.

[0068] Figure label:

[0069] 10. Casing 332, Second Reinforcing Section

[0070] 1. Nail box housing 333 Second connecting part

[0071] 11 First nail box outer shell 334 Third limiting groove

[0072] 113 First nail box hole 4 External connector

[0073] 114 Connecting rod embedded in groove 41 First outer sleeve

[0074] 12 Second nail box outer shell 411 Third fixing hole

[0075] 121 First fixing groove 42 Second outer sleeve

[0076] 122 Second fixing groove 421 First embedding groove

[0077] 123 Second nail box hole 422 Second embedding groove

[0078] 2 First inner connector 423 Second groove

[0079] 21 First fixing part 424 Third groove

[0080] 211 First fixing hole 43 Third outer sleeve

[0081] 212 First clearance slot 431 First limit slot

[0082] 213 First cutting groove 51 Fixing pin

[0083] 214 Pin Hole 52 Limit Pin

[0084] 22 First Deformation Part 6 Nail Head

[0085] 221 First Embedded Part 61 Staple Container

[0086] 222 First groove 62 Stapling rack

[0087] 23 First Limited Part 621 Fixing Sleeve

[0088] 231 First limiting hole 623 Connecting post

[0089] 232 First Reinforcing Section 63 Cutting Blade

[0090] 233 First connecting part 64 Anvil casing

[0091] 234 Second limiting groove 65 Connecting pin

[0092] 3 Second inner connecting member 66 Connecting rod

[0093] 31 Second fixing part 661 Through hole

[0094] 311 Second fixing hole 67 Anvil body

[0095] 312 Second clearance slot 7 Swing head pull rod

[0096] 313 Second cutting groove 8 Firing lever

[0097] 32 Second Deformation Section 81 Push Blade

[0098] 321 Second Embedded Part 91 First Channel

[0099] 33 Second Limited Section 921 Second Channel

[0100] 331 Second limiting hole 922 Third channel Detailed Implementation

[0101] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that the invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted.

[0102] This invention provides a drive mechanism for a medical stapler and a medical stapler including the drive mechanism. The medical stapler includes a stapler body and a staple head located distal to the stapler body. The stapler body includes an instrument platform and a firing handle rotatably connected to the instrument platform. The drive mechanism includes: a staple cartridge housing connected between the staple head and the stapler body; a firing lever, at least partially located inside the staple cartridge housing, and extending axially along the stapler body into the staple head; an inner connecting member including a fixing portion, a deforming portion, and a limiting portion sequentially arranged from the distal to the proximal side; and an outer connecting member including a first outer sleeve, a second outer sleeve, and a third outer sleeve respectively sleeved outside the fixing portion, the deforming portion, and the limiting portion; wherein the fixing portion and the first outer sleeve are fixedly connected to the proximal side of the staple head, and the limiting portion... The third outer sleeve is fixedly connected to the distal end of the nail cartridge housing; the inner connector and the outer connector together define an axially extending first channel, the firing rod passes through the first channel, and when the nail head swings axially relative to the stapler body, the firing rod swings with the nail head, the deformation portion and the second outer sleeve at least partially deform with the swing of the nail head, and the deformation portion and the limiting portion provide a limiting and retaining effect on the firing rod when it bends, the firing rod is limited by the deformation portion and the limiting portion and will not produce excessive deformation, effectively limiting the deformation of the firing rod.

[0103] The structure of the driving mechanism of various specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the various specific embodiments are not intended to limit the scope of protection of the present invention.

[0104] Figures 1-14 The structure of the drive mechanism according to a first embodiment of the present invention is shown, as well as the cooperation between the drive mechanism and the staple head 6. The first embodiment of the present invention provides a drive mechanism for a medical stapler and a medical stapler including the drive mechanism. The medical stapler includes a stapler body and a staple head 6 located at the distal end of the stapler body. The stapler body includes an instrument platform and a firing handle rotatably connected to the instrument platform. The structure of the instrument platform may vary depending on the type of stapler; for example, one stapler instrument platform includes a platform housing, a rack structure located inside the platform housing, and a swing knob for controlling the swing of the staple head. When the stapler is fired, the operator, by holding the firing handle, drives the firing lever to move towards the distal end of the stapler through the cooperation of the firing handle and the rack structure. Figure 1 and Figure 2As shown, the staple head 6 includes a staple cartridge assembly and a staple anvil disposed opposite to each other. The staple cartridge assembly includes a staple cartridge 61 for carrying staples, a staple cartridge holder 62 for carrying the staple cartridge 61, a firing block (not shown in the figure), and a cutter 63. The staple anvil includes a staple anvil housing 64 and a staple anvil body 67, and the proximal end of the staple anvil housing 64 is rotatably connected to the proximal end of the staple cartridge holder 62.

[0105] In this invention, the distal and proximal sides are relative to the operator. The end closer to the operator is the proximal side, and the end farther from the operator, i.e., closer to the surgical position, is the distal side. The direction along the axis of the stapler is the axial direction, i.e., the direction from the distal side to the proximal side of the stapler, or the direction from the proximal side to the distal side of the stapler. For example, in Figure 1 From the perspective of the stapled cartridge 62, its distal side is the left side and its proximal side is the right side. Figure 1 The S1 direction is the direction from the distal side to the proximal side of the stapler. (Definition) Figure 1 The direction of S1, or the direction opposite to S1, is the axial direction of the anastomosis device. (Definition) Figure 1 In the S2 direction, the longitudinal direction is defined as the height direction. Figure 3 In the S3 direction, the direction is transverse, i.e., the width direction, which can also be called the radial direction. In this invention, for a component, the inner and outer sides are relative to the axis of the anastomosis device; the side closer to the axis is the inner side, and the side farther from the axis is the outer side.

[0106] like Figure 1 and Figure 2 As shown, the driving mechanism includes a staple cartridge housing 1, a firing rod 8, and a connector. The connector includes an inner connector and an outer connector 4 sleeved outside the inner connector. The inner connector includes at least a first inner connector 2. The staple cartridge housing 1 is connected between the staple head 6 and the stapler body. In this embodiment, the staple cartridge housing 1 includes a first staple cartridge housing 11 and a second staple cartridge housing 12, which together define an accommodating space. A cylindrical sleeve 10 is sleeved on the outside of the staple cartridge housing 1. The firing rod 8 is formed by stacking multiple pusher blades 81 in a transverse direction. The firing rod 8 is at least partially located inside the accommodating space of the staple cartridge housing 1, and extends axially along the stapler body into the staple head 6 to cooperate with the cutter 63 in the staple head 6.

[0107] like Figures 3-6As shown, the first inner connector 2 includes a first fixing part 21, a first deforming part 22, and a first limiting part 23 arranged sequentially from the distal end to the proximal end. The first fixing part 21 is connected to the proximal end of the nail head 6, and the first limiting part 23 is connected to the distal end of the nail cartridge housing 1. The outer connector 4 includes a first outer sleeve 41, a second outer sleeve 42, and a third outer sleeve 43. The first outer sleeve 41 is fitted over the first fixing part 21, the second outer sleeve 42 is fitted over the first deforming part 22, and the third outer sleeve 43 is fitted over the first limiting part 23. The third outer sleeve 43 is also connected to the distal end of the nail cartridge housing 1. The first inner connector 2 and the outer connector 4 together define an axially extending first channel 91, through which the firing rod 8 passes. Therefore, the nail head can be connected to the distal end of the nail cartridge housing 1 through the first inner connector 2 and the outer connector 3. A fixing sleeve 621 is provided on the proximal side of the staple cartridge holder 62. The first fixing part 21 at least partially enters the interior of the fixing sleeve 621. The anvil housing 64, the first fixing part 21, and the staple cartridge holder 62 are connected by a connecting pin 65. Specifically, a pin hole 214 is provided on the distal side of the first fixing part 21, and the pin hole 214 protrudes outside the first outer sleeve 41. The connecting pin 65 passes through the anvil housing 64 and the staple cartridge holder 62 and at least partially enters the pin hole 214. In this embodiment, a cutter 63 is provided on the proximal side of the staple head 6, and a first cutter groove 213 is provided on the distal side of the first fixing part 21. The first cutter groove 213 communicates with the first channel 91, and in the initial state, the cutter 63 partially enters the first cutter groove 213. When the stapler is fired, the firing lever 8 is driven to move distally towards the stapler. The firing lever 8 drives the cutter 63 distally, which in turn drives the firing block in the staple cartridge assembly distally to eject the staples from the staple cartridge 61. Simultaneously, the cutter 63 cuts the tissue, achieving both suturing and cutting. The first inner connector 2 and the outer connector 4 can be made of different materials. For example, the first inner connector 2 can be made of a material with a lower hardness than the outer connector 4, allowing it to better adapt to the deformation of the firing lever 8 when it bends, while the outer connector 4 provides better support.

[0108] In this embodiment, when the staple head 6 swings axially relative to the stapler body, i.e., when the staple head 6 swings laterally, the firing lever 8 swings with the staple head 6, and the first deformable portion 22 and the second outer sleeve portion 42 deform at least partially with the swing of the staple head 6. Specifically, when the staple head 6 swings axially relative to the stapler body towards a first side, at least partially compressive deformation occurs on the first side of the first deformable portion 22 and the second outer sleeve portion 42, and at least partially tensile deformation occurs on the second side of the first deformable portion 22 and the second outer sleeve portion 42. When the staple head 6 swings axially relative to the stapler body towards a second side, at least partially tensile deformation occurs on the first side of the first deformable portion 22 and the second outer sleeve portion 42, and at least partially compressive deformation occurs on the second side of the first deformable portion 22 and the second outer sleeve portion 42. When the nail head 6 swings relative to the axial direction, the first limiting part 23 does not deform, or although it deforms, the deformation is less than that of the first deforming part 22. The third outer sleeve 43 does not deform, or although it deforms, the deformation is less than that of the second outer sleeve 42. Thus, the firing lever 8 is limited by the first deforming part 22 and the first limiting part 23, preventing excessive deformation and effectively limiting the deformation of the firing lever 8. This also prevents the multiple pusher blades 81 from spreading apart when bent, improving surgical results. Here, deformation refers to the degree of deformation of a component relative to its initial state. For example, the deformation is measured by the angle between the centerline of a component after deformation and its centerline in the initial state; the larger the angle, the greater the deformation.

[0109] like Figures 3-6As shown, in this embodiment, the inner connector further includes a second inner connector 3. The first inner connector 2 is located on the side of the second inner connector 3 away from the bottom surface of the nail head 6. The second inner connector 3 includes a second fixing part 31, a second deformable part 32, and a second limiting part 33. That is, the fixing part of the inner connector includes the first fixing part 21 and the second fixing part 31, the deformable part of the inner connector includes the first deformable part 22 and the second deformable part 32, and the limiting part of the inner connector includes the first limiting part 23 and the second limiting part 33. The first fixing part 21, the second fixing part 31, and the first outer sleeve part 41 are connected by at least one fixing pin 51. Specifically, the first fixing part 21 is provided with a first fixing hole 211, the second fixing part 31 is provided with a second fixing hole 311, the first outer sleeve part 41 is provided with a third fixing hole 411, and the fixing pin 51 passes through the first fixing hole 211, the second fixing hole 311, and the third fixing hole 411 simultaneously. The distal end of the second fixing part 31 has a second cutting groove 313 communicating with the first channel 91. Initially, the cutter 63 is at least partially inserted into the second cutting groove 313. In this embodiment, two fixing pins 51 are provided, located on opposite sides of the connector. The two fixing pins 51 ensure a non-rotatable connection between the first fixing part 21, the second fixing part 31, and the first outer sleeve part 41. Figures 5-8 As shown, the drive mechanism also includes an axially extending swing head pull rod 7. A fixing pin 51 passes through the first fixing part 21, the second fixing part 31, the first outer sleeve part 41, and the distal end of the swing head pull rod 7. A second channel 921 is provided on one side of the outer connector 4, and a third channel 922 is provided on the inner connector opposite to the second channel 921. The second channel 921 and the third channel 922 are connected to form a pull rod channel, through which the swing head pull rod 7 passes. Figure 7 and Figure 9 As shown, the first inner connector 2 has a first recessed groove 212 facing outward at the position corresponding to the distal end of the swing head rod 7, and a first fixing hole 211 is disposed in the first recessed groove 212. The second inner connector 3 has a second recessed groove 312 facing outward at the position corresponding to the distal end of the swing head rod 7, and a second fixing hole 311 is disposed in the second recessed groove 312. The first deformable part 22 and the second deformable part 32 also have a clearance structure for making way for the swing head rod 7 at the position corresponding to the third channel 922.

[0110] like Figure 3 and Figure 4As shown, in this embodiment, the upper side of the second outer sleeve 42 is provided with an axially extending first embedding groove 421, and the lower side is provided with an axially extending second embedding groove 422. The first deformable part 22 is provided with a first embedding part 221 embedded in the first embedding groove 421, and the second deformable part 32 is provided with a second embedding part 321 embedded in the second embedding groove 422. The shape of the first embedding part 221 is adapted to the shape of the first embedding groove 421, and the shape of the second embedding part 321 is adapted to the shape of the second embedding groove 422. Thus, a non-rotatable connection is formed between the first deformable part 22, the second deformable part 32, and the second outer sleeve 42. In another alternative embodiment, the upper side of the first deformable part may be provided with an axially extending first embedding groove, the lower side of the second deformable part may be provided with an axially extending second embedding groove, the inner surface of the upper sidewall of the second outer sleeve may be provided with a first embedding part embedded in the first embedding groove, and the inner surface of the lower sidewall may be provided with a second embedding part embedded in the second embedding groove.

[0111] like Figure 5 and Figure 6 As shown, in this embodiment, to further improve the deformation capacity of the deformable portion and the second outer sleeve 42 and to prevent them from affecting the smoothness of the nail head 6's swing, the first deformable portion 22 and the second deformable portion 32 are respectively provided with multiple first grooves 222 to enhance their deformation capacity. The second outer sleeve 42 is provided with multiple second grooves 423 to enhance its deformation capacity. In this embodiment, the first grooves 222 extend in the transverse direction and are provided in the first grooves 222 of the first deformable portion 22, connecting the upper and lower surfaces of the first deformable portion 22. The first grooves 222 of the second deformable portion 32 are also provided in the second grooves 32, connecting the upper and lower surfaces of the second deformable portion 32. The ends of the multiple first grooves 222 are independent free ends. The first groove 222 has a first width near the axis and a second width away from the axis, with the first width being greater than the second width. The end of the first groove 222 is the end away from the axis.

[0112] like Figure 6As shown, the second groove 423 extends laterally and is formed on the inner surfaces of the first embedding groove 421 and the second embedding groove 422, respectively, and connects the inner and outer surfaces of the second outer sleeve portion 42. The ends of the plurality of second grooves 423 are independent free ends. The second groove 423 has a third width near the axis and a fourth width away from the axis, the fourth width being greater than the third width. The end of the second groove 423 is the end closest to the axis. Therefore, the ends of the plurality of first grooves 222 and the ends of the plurality of second grooves 423 face opposite directions.

[0113] In another alternative embodiment, the first groove may also be an arcuate groove radiating outward from the central axis of the first deformable portion 22 / second deformable portion 32, and the second groove may be an arcuate groove radiating outward from the central axis of the second outer sleeve portion 42. In other alternative embodiments, the first groove and the second groove may also adopt other shapes and / or other arrangements.

[0114] like Figures 3-6 As shown, the first limiting part 23 and the second limiting part 33 are fixedly connected, and the first limiting part 23 can only move axially relative to the third outer sleeve part 43. Specifically, the first limiting part 23 and the second limiting part 33 are provided with limiting pins 52, and the third outer sleeve part 43 is provided with a first limiting groove 431 extending axially. The limiting pin 52 at least partially enters the first limiting groove 431, and the limiting pin 52 can move axially relative to the first limiting groove 431.

[0115] like Figure 6As shown, in this embodiment, the first limiting part 23 is provided with a first limiting hole 231, and the second limiting part 33 is provided with a second limiting hole 331. The limiting pin 52 passes through both the first limiting hole 231 and the second limiting hole 331. The width of the first limiting groove 431 is substantially the same as the outer diameter of the limiting pin 52, thereby ensuring that the limiting pin 52 only moves axially relative to the first limiting groove 431 and does not move in other directions. The inner diameters of the first limiting hole 231 and the second limiting hole 331 are the same as the outer diameter of the limiting pin 52 to keep the first limiting part 23 and the second limiting part 33 fixedly connected. In this embodiment, four limiting pins 52 are provided: two are located on the left side of the first channel 91 and arranged axially, and two are located on the right side of the first channel 91 and arranged axially. The upper and lower side walls of the third outer sleeve 43 are respectively provided with first limiting grooves 431. The upper side wall of the third outer sleeve 43 has one first limiting groove 431 on the left and one on the right, while the lower side wall is the same. This structure can prevent rotational movement between the first limiting part, the second limiting part, and the third outer sleeve 43, forming a non-rotatable connection. In other alternative embodiments, the number and arrangement of the limiting pins 52 can be selected as needed, and are not limited to... Figure 6 The structures shown are limited to those described above.

[0116] In another alternative embodiment, the first limiting engagement portion of the first inner connector 2 and the second inner connector 3 is a limiting groove extending axially, and the second limiting engagement portion of the outer connector 4 is a limiting pin passing through the third outer sleeve portion 43. The limiting pin at least partially enters the limiting groove and can move along the extending direction of the limiting groove. This can also achieve a non-rotatable connection between the first limiting portion 23, the second limiting portion 33 and the third outer sleeve portion 43, where the first limiting portion 23 and the second limiting portion 33 can only move axially relative to the third outer sleeve portion 43.

[0117] like Figure 1 As shown, in this embodiment, a connecting post 623 is provided on the fixing sleeve 621 of the staple cartridge 62. Figure 1 and Figure 11As shown, the nail head 6 and the nail cartridge housing 1 are rotatably connected by a connecting rod 66. A through hole 661 is provided at the distal end of the connecting rod 66, which is fitted onto the connecting post 623 and is rotatable relative to the connecting post 623. A connecting rod embedding groove 114 is provided on the upper surface of the first nail cartridge housing 11, and the proximal end of the connecting rod 66 is embedded in the connecting rod embedding groove 114. In this embodiment, two connecting rods 66 are provided, located above the first nail cartridge housing 11 and below the second nail cartridge housing 12, respectively. The lower surface of the second nail cartridge housing 12 also has a connecting rod embedding groove 114 for embedding one of the connecting rods 66. Figures 12-14 As shown, in this embodiment, a fixing groove is provided on the inner side of the second nail cartridge housing 12. Similarly, a fixing groove (not shown in the figure) is also provided on the inner side of the first nail cartridge housing 11. The first limiting part 23, the second limiting part 33, and the third outer sleeve part 43 are embedded in the fixing groove. A first nail cartridge hole 113 is provided at the bottom of the fixing groove of the first nail cartridge housing 11, and a second nail cartridge hole 123 is provided at the bottom of the fixing groove of the second nail cartridge housing 12. The limiting pin 52 at least partially enters the first nail cartridge hole 113 and the second nail cartridge hole 123, thereby fixing the first limiting part and the second limiting part to the first nail cartridge housing 11 and the second nail cartridge housing 12.

[0118] like Figure 13 and Figure 14 As shown, in this embodiment, the fixing groove includes a first fixing groove 121 and a second fixing groove 122. The first limiting part 23, the second limiting part 33, and the third outer sleeve part 43 enter the first fixing groove 121, and the first deformable part 22, the second deformable part 32, and the second outer sleeve part 42 at least partially enter the second fixing groove 122. Figure 7 As shown, the width of the first deformable portion 22 is greater than the width of the first limiting portion 23, the width of the second deformable portion 32 is greater than the width of the second limiting portion 33, and the width of the second outer sleeve portion 42 is greater than the width of the third outer sleeve portion 43. Correspondingly, as... Figure 13 and Figure 14 As shown, the width of the second fixing groove 122 is greater than the width of the first fixing groove 121, and there is a first gap between the outer wall of the second outer sleeve 42 and the inner wall of the second fixing groove 122, so as to provide a certain deformation space for the second outer sleeve 42, the first deformable part 22 and the second deformable part 32.

[0119] Figures 15-17A schematic diagram of the drive mechanism according to a second embodiment of the present invention is shown. The first difference between this second embodiment and the first embodiment is that in the second embodiment, the first embedding groove 421 and the second embedding groove 422 have second grooves 423 on both sides, and the second outer sleeve 42 has third grooves on its left and right sides respectively. In the first embodiment, the second outer sleeve 42 does not have the third grooves on its left and right sides; therefore, the second outer sleeve in the second embodiment has better deformation capability than the second outer sleeve in the first embodiment. In the second embodiment, the ends of the plurality of third grooves 424 are independent free ends. The third groove 424 has a fifth width near the axis and a sixth width away from the axis, with the fifth width being greater than the sixth width. The end of the third groove 424 is the end away from the axis, that is, it faces the same direction as the first groove 222 of the deformable part.

[0120] The second difference between the second embodiment and the first embodiment is that in the second embodiment, the first limiting part 23 includes a first connecting part 233 and a first reinforcing part 232. The first connecting part 233 is connected between the first reinforcing part 232 and the first deformable part 22. The lateral width of the first reinforcing part 232 is greater than the lateral width of the first connecting part 233. By increasing the lateral width of the first reinforcing part 232, the structural strength of the first reinforcing part 232 and the fit between the first reinforcing part 232 and the nail box shell 1 can be improved, and the limiting effect of the first limiting part 23 on the deformation of the firing rod 8 is enhanced. Similarly, the second limiting part 33 includes a second connecting part 333 and a second reinforcing part 332. The second connecting part 333 is connected between the second reinforcing part 332 and the second deformable part 32. The lateral width of the second reinforcing part 332 is greater than the lateral width of the second connecting part 333. By increasing the lateral width of the second reinforcing part 332, the structural strength of the second reinforcing part 332 and the fit between the second reinforcing part 332 and the nail box shell 1 can be improved, and the limiting effect of the second limiting part 33 on the deformation of the firing lever 8 is enhanced.

[0121] like Figure 18 and Figure 19The diagram shows a structural schematic of the connector according to a third embodiment of the present invention. This embodiment differs from the first embodiment in that the first limiting portion 23 of the first inner connector 2 and the second limiting portion 33 of the second inner connector 3 are not provided with the first limiting hole and the second limiting hole, but instead are respectively provided with a second limiting groove 234 and a third limiting groove 334 extending axially. The limiting pin 52 simultaneously enters the second limiting groove 234 and the third limiting groove 334, and can move along the extending direction of the second limiting groove 234 and the third limiting groove 334. The lengths of the second limiting groove 234 and the third limiting groove 334 can be less than the length of the first limiting groove 431. Compared to the connector of the first embodiment, the connector of this embodiment has a greater degree of relative freedom of movement between the third outer sleeve portion 43, the first limiting portion 23, and the second limiting portion 33 when the nail head swings, which can improve the smoothness of the nail head swinging operation.

[0122] In the third embodiment, the limiting pin 52 is a pin with a waist-shaped cross-section, and the major axis of the limiting pin 52 is parallel to the axial direction. In other alternative embodiments, the limiting pin 52 can also be a post pin with a circular, elliptical, or rounded rectangular cross-section. In this embodiment, the first limiting groove 431, the second limiting groove 234, and the third limiting groove 334 have waist-shaped cross-sections, and the major axis of the waist shape is parallel to the axial direction. The second limiting groove 234 and the third limiting groove 334 are the same size and shape. The first limiting groove 431 has a first axial length, and the second limiting groove 234 and the third limiting groove 334 have a second axial length, where the first axial length is greater than the second axial length. In other alternative embodiments, the lengths of the second limiting groove 234 and the third limiting groove 334 can also be equal to the length of the first limiting groove 431. Alternatively, the lengths of the second limiting groove 234 and the third limiting groove 334 can be different. In this third embodiment, the structure of other components is basically the same as in the first embodiment, and will not be described again here.

[0123] In the first, second, and third embodiments, the inner connector includes a first inner connector and a second inner connector. The first and second inner connectors can be made of the same material, and the inner connector and the outer connector can be made of the same or different materials. In other alternative embodiments, the inner connector may also include only one first inner connector, that is, the fixing part includes only a first fixing part, the deformable part includes only a first deformable part, and the limiting part includes only a first limiting part. The structure of the limiting part can be as shown in the first embodiment or as shown in the second embodiment. The inner connector and the outer connector are made of at least partially deformable materials; for example, the inner connector and / or the outer connector can be made of medical-grade plastics such as polyvinyl chloride (PVC), polyethylene (PE), or polypropylene (PP).

[0124] In the first, second, and third embodiments, a lubrication structure is provided between the outer connector and the inner connector, or between the first inner connector, the second inner connector, and the outer connector. The lubrication structure may be a lubricant, lubricating oil, or a lubrication process, such as adding a lubricating coating, to reduce friction and increase the smoothness of relative movement.

[0125] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A driving mechanism, characterized in that, A medical stapler, the medical stapler comprising a stapler body and a staple head located at the distal end of the stapler body; the drive mechanism comprising: The staple cartridge housing is connected between the staple head and the stapler body; A firing lever, at least partially located inside the staple cartridge housing, and extending axially along the stapler body into the staple head; The internal connector includes a fixing part, a deforming part, and a limiting part arranged sequentially from the distal end to the proximal end; The external connector includes a first outer sleeve, a second outer sleeve, and a third outer sleeve respectively fitted onto the outside of the fixing part, the deforming part, and the limiting part; The fixing part and the first outer sleeve part are fixedly connected to the proximal end of the nail head, and the limiting part and the third outer sleeve part are fixedly connected to the distal end of the nail box shell. The inner connector and the outer connector together define an axially extending first channel. The firing rod passes through the first channel. When the nail head swings axially relative to the stapler body, the firing rod swings with the nail head. The deformable part and the second outer sleeve deform at least partially with the swing of the nail head.

2. The driving mechanism according to claim 1, characterized in that, When the staple head swings axially toward the first side relative to the stapler body, at least part of the first side of the deformable part and the second outer sleeve undergoes compressive deformation, and at least part of the second side of the deformable part and the second outer sleeve undergoes tensile deformation. When the staple head swings axially toward the second side relative to the stapler body, at least part of the first side of the deformable part and the second outer sleeve undergoes tensile deformation, and at least part of the second side of the deformable part and the second outer sleeve undergoes compressive deformation.

3. The driving mechanism according to claim 1, characterized in that, The nail head includes a nail cartridge holder, and a pin hole is provided on the distal side of the fixing part. The pin hole protrudes outside the first outer sleeve part, and the fixing part and the nail cartridge holder are connected by a connecting pin that at least partially enters the pin hole.

4. The driving mechanism according to claim 3, characterized in that, A fixing sleeve is provided on the proximal side of the staple cartridge, and the fixing part at least partially enters the interior of the fixing sleeve.

5. The driving mechanism according to claim 1, characterized in that, The fixing part of the inner connector and the first outer sleeve part of the outer connector are connected by at least one fixing pin.

6. The driving mechanism according to claim 5, characterized in that, The drive mechanism also includes an axially extending swing head rod, with one of the fixing pins passing through the fixing part, the first outer sleeve part, and the distal end of the swing head rod.

7. The driving mechanism according to claim 6, characterized in that, The outer connector has a second channel on one side, and the inner connector has a third channel opposite to the second channel. The swing head rod passes through the second channel and the third channel.

8. The driving mechanism according to claim 7, characterized in that, The second channel is provided with a recessed relief groove facing outward at the position corresponding to the distal end of the swing head rod. A fixing hole is provided in the relief groove, and a fixing pin passes through both the fixing hole and the distal end of the swing head rod.

9. The driving mechanism according to claim 5, characterized in that, The inner connector includes a first inner connector and a second inner connector. The first inner connector is located on the side of the second inner connector away from the bottom surface of the nail head. The first inner connector includes a first fixing part, a first deforming part and a first limiting part. The second inner connector includes a second fixing part, a second deforming part and a second limiting part. The first fixing part, the second fixing part, and the first outer sleeve part are fixedly connected to the proximal side of the nail head by the fixing pin.

10. The driving mechanism according to claim 9, characterized in that, The limiting portion of the inner connector and the third outer sleeve portion of the outer connector are connected to the distal end of the nail box housing by at least one limiting pin.

11. The driving mechanism according to claim 1, characterized in that, A cutter is provided on the proximal side of the nail head, and a cutter groove is provided on the distal side of the fixing part. The cutter groove is connected to the first channel, and in the initial state, the cutter part enters the cutter groove.

12. The driving mechanism according to claim 1, characterized in that, The deformable part has multiple first grooves, and the second outer sleeve part has multiple second grooves.

13. The driving mechanism according to claim 12, characterized in that, The first groove is an arc groove that radiates outward from the central axis of the deformed part, or the first groove extends in the lateral direction. The ends of the plurality of first grooves are independent free ends. The first groove has a first width near the axis and a second width away from the axis. The first width is greater than the second width. The second groove is an arc groove that radiates outward from the central axis of the second outer sleeve, or the second groove extends in the lateral direction. The ends of the plurality of second grooves are independent free ends. The second groove has a third width near the axis and a fourth width away from the axis. The fourth width is greater than the third width. The ends of the plurality of first grooves are oriented in the opposite direction to the ends of the plurality of second grooves.

14. The driving mechanism according to claim 12, characterized in that, The upper and / or lower sides of the second outer sleeve are provided with axially extending insert grooves, and the deformable portion is provided with an insert portion that is embedded in the insert groove, the shape of the insert portion being adapted to the shape of the insert groove; or, The upper and / or lower sides of the deformable part are provided with axially extending embedding grooves, and the second outer sleeve is provided with an embedding part that is embedded in the embedding groove, the shape of the embedding part being adapted to the shape of the embedding groove.

15. The driving mechanism according to claim 14, characterized in that, The second groove is provided on both sides of the embedding groove, and the third groove is provided on the left and right sides of the second outer sleeve. The ends of the plurality of third grooves are independent free ends. The third groove has a fifth width near the axis and a sixth width away from the axis. The fifth width is greater than the sixth width.

16. The driving mechanism according to claim 1, characterized in that, When the staple head swings axially relative to the stapler body, the firing rod swings with the staple head, and the limiting part does not deform, or the deformation of the limiting part is less than the deformation of the deformable part.

17. The driving mechanism according to claim 10, characterized in that, The first inner connector is provided with a first limiting hole, the second inner connector is provided with a second limiting hole, and the limiting pin is fixedly connected to the first limiting hole and the second limiting hole.

18. The driving mechanism according to claim 17, characterized in that, The third outer sleeve of the external connector is provided with an axially extending first limiting groove, and the limiting pin is located in the first limiting groove and can move axially.

19. The driving mechanism according to claim 10, characterized in that, The first inner connector is provided with a second limiting groove, the second inner connector is provided with a third limiting groove, the limiting pin is movably connected to the second limiting groove and the third limiting groove, the third outer sleeve of the outer connector is provided with a first limiting groove extending along the axial direction, and the limiting pin is movably disposed in the first limiting groove, the second limiting groove and the third limiting groove.

20. The driving mechanism according to claim 19, characterized in that, The cross-section of the limiting pin is waist-shaped, and the major axis of the waist shape is parallel to the axial direction. The first limiting groove, the second limiting groove and the third limiting groove have waist-shaped cross sections and the major axis of the waist shape is parallel to the axial direction; The second limiting groove and the third limiting groove are the same size and shape. The first limiting groove has a first axial length, and the second limiting groove and the third limiting groove have a second axial length. The first axial length is greater than the second axial length.

21. The driving mechanism according to claim 10, characterized in that, The inner side of the nail box shell is provided with a fixing groove, and the limiting part and the third outer sleeve part are embedded in the fixing groove; The bottom of the fixing groove of the nail box shell is provided with a nail box hole, and the limiting pin is at least partially inserted into the nail box hole.

22. The driving mechanism according to claim 21, characterized in that, The fixing groove includes a first fixing groove and a second fixing groove. The limiting part and the third outer sleeve part enter the first fixing groove. The deformable part and the second outer sleeve part at least partially enter the second fixing groove. The width of the second fixing groove is greater than the width of the first fixing groove, and there is a first gap between the outer side wall of the second outer sleeve part and the inner side wall of the second fixing groove.

23. The driving mechanism according to claim 1, characterized in that, The limiting part includes a connecting part and a reinforcing part. The connecting part is connected between the reinforcing part and the deformable part. The lateral width of the reinforcing part is greater than the lateral width of the connecting part.

24. The driving mechanism according to claim 1, characterized in that, A lubrication structure is provided between the inner connector and / or the outer connector.

25. The driving mechanism according to claim 1, characterized in that, The inner connector and / or the outer connector are made of different materials.

26. A medical stapler, characterized in that, Includes the drive mechanism according to any one of claims 1 to 25.

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