Drive mechanism and medical stapler

Abstract

This invention provides a driving mechanism and a medical stapler for use in a medical stapler. The medical stapler includes a stapler body and a staple head located at the distal end of the stapler body. The driving mechanism includes: a staple cartridge housing located 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; a connector whose distal end is connected to the staple head, the interior of the connector defining an axially extending first channel through which the firing rod passes; and an adapter connected to the proximal end of the connector, and the adapter is rotatably connected to the distal end of the staple cartridge housing. The connector and the staple cartridge housing of this invention form a more flexible rotatable connection with a larger relative rotation angle.

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] Medical staplers generally include a stapler body and a staple head. A staple cartridge housing is located at the distal end of the stapler body. The distal end of the staple cartridge housing is connected to the staple head via a connector. A firing lever extending axially along the staple cartridge housing is located inside the staple cartridge housing. The distal end of the firing lever extends through the connector and enters 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 the prior art, 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 connector and the distal end of the firing lever to swing together. However, during the swinging process of the nail head, the smoothness of the nail head swing may be affected due to the insufficient flexibility of the connector's rotation.

[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 purpose of the present invention is to provide a driving mechanism and a medical stapler, wherein the connecting member can rotate more flexibly relative to the staple cartridge shell through the adapter and has a larger rotation angle, thereby improving the smoothness of the staple head swing.

[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 located 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] A connector, the distal end of which is connected to the nail head, the interior of which defines an axially extending first channel, through which the firing rod passes;

[0010] An adapter is connected to the proximal side of the connector and is rotatably connected to the distal side of the nail cartridge housing.

[0011] In some embodiments, the adapter internally defines a second channel through which the firing lever passes.

[0012] In some embodiments, the adapter includes a receiving portion and a first rotating engagement portion located on at least one side of the receiving portion, the interior of the receiving portion defining the second channel, and a second rotating engagement portion disposed on one side of the inner surface of the nail cartridge housing, wherein the first rotating engagement portion and the second rotating engagement portion form a rotatable fitting engagement.

[0013] In some embodiments, the first rotating engagement portion is a fixing post disposed on the upper and / or lower surface of the receiving portion, and the second rotating engagement portion is a nail cartridge groove disposed on the inner surface of the nail cartridge housing, or a nail cartridge hole penetrating the nail cartridge housing, wherein the fixing post at least partially enters the nail cartridge groove; or,

[0014] The first rotating fitting part is a rotating fixing groove or rotating fixing hole provided on the upper and / or lower surface of the receiving part, and the second rotating fitting part is a fixing post provided on the inner surface of the nail box shell, wherein the fixing post at least partially enters the rotating fixing groove or rotating fixing hole.

[0015] In some embodiments, the receiving portion includes a receiving cavity communicating with the second channel, the proximal side of the connector at least partially enters the receiving cavity, and the proximal side of the connector is fixedly connected to the receiving portion.

[0016] In some embodiments, the connector includes a fixing part, a deformable part, and a limiting part arranged sequentially from the distal end to the proximal end. The limiting part is fixedly connected to the receiving part after at least partially entering the receiving cavity, and the fixing part is connected to the nail head.

[0017] When the staple head swings axially relative to the stapler body, the firing rod swings with the staple head, and the deformable part deforms at least partially with the swing of the staple head.

[0018] In some embodiments, the connector includes an inner connector and an outer connector. The inner connector includes the fixing part, the deformable part, and the limiting part. The outer connector includes a first outer sleeve, a second outer sleeve, and a third outer sleeve respectively sleeved outside the fixing part, the deformable part, and the limiting part. The fixing part and the first outer sleeve are connected by a first fixing pin. The limiting part and the third outer sleeve are fixedly connected to the receiving part after at least partially entering the receiving cavity.

[0019] In some embodiments, the proximal end face of the defining portion protrudes in a proximal direction relative to the proximal end face of the third outer sleeve portion, the third outer sleeve portion and the defining portion are connected to the receiving portion by a second fixing pin, and the portion of the defining portion protruding from the third outer sleeve portion is connected to the receiving portion by a third fixing pin.

[0020] In some embodiments, the second retaining pin is located further away from the axis than the third retaining pin.

[0021] In some embodiments, the third outer sleeve and the limiting portion are connected to the receiving portion by a second fixing pin.

[0022] In some embodiments, a first clearance groove is provided at the position opposite to the third fixing pin of the first rotary mating part.

[0023] In some embodiments, a first limiting portion and a second limiting portion are provided on the proximal side of the receiving cavity, the first limiting portion is located on the distal side of the second limiting portion, the first limiting portion is opposite to the proximal surface of the third outer sleeve, and the second limiting portion is opposite to the proximal surface of the limiting portion.

[0024] In some embodiments, the distal end face of the first limiting portion is provided with a second clearance groove, and the third fixing pin at least partially enters the interior of the second clearance groove; and / or

[0025] A third clearance groove is provided on the proximal side of the third outer sleeve, and the third fixing pin at least partially enters the interior of the third clearance groove.

[0026] In some embodiments, the surface of the first limiting portion opposite to the firing rod is an inclined surface; and / or, the second limiting portion has a second gap with the firing rod.

[0027] In some embodiments, the inner connector includes a first inner connector and a second inner connector arranged longitudinally. The first inner connector includes a first fixing portion, a first deformable portion, and a first limiting portion. The second inner connector includes a second fixing portion, a second deformable portion, and a second limiting portion. The first fixing pin passes through the first outer sleeve portion, the first fixing portion, and the second fixing portion. The second fixing pin passes through the third outer sleeve portion, the first limiting portion, and the second limiting portion. The third fixing pin passes through the portions of the first limiting portion and the second limiting portion that protrude from the third outer sleeve portion.

[0028] In some embodiments, the external connector includes a first external connector and a second external connector arranged laterally, the first external connector and the second external connector together forming the first outer cover, the second outer cover and the third outer cover.

[0029] In some embodiments, at least one side of the second outer sleeve is provided with an axially extending first insert fitting portion, and at least one side of the deformable portion is provided with an axially extending second insert fitting portion, wherein the second insert fitting portion and the first insert fitting portion form an interlocking fit.

[0030] In some embodiments, the first embedding mating portion is an embedding groove, the second embedding mating portion is an embedding portion, and the side surface of the deformable portion is formed with a plurality of first grooves, the first grooves extending in the lateral direction, the ends of the plurality of first grooves being independent free ends, the first grooves having a first width near the axis and a second width away from the axis, the first width being greater than the second width; the inner side surface of the embedding groove is formed with a plurality of second grooves, the second grooves extending in the lateral direction, the ends of the plurality of second grooves being independent free ends, the second grooves having a third width near the axis and a fourth width away from the axis, the fourth width being greater than the third width; the ends of the plurality of first grooves and the ends of the plurality of second grooves are oriented in opposite directions.

[0031] In some embodiments, the left and right sides of the second outer sleeve are respectively provided with third grooves, and the ends of the plurality of third grooves are independent free ends. The third grooves have a fifth width near the axis and a sixth width away from the axis, and the fifth width is greater than the sixth width.

[0032] In some embodiments, the interior of the nail box housing is provided with a first fixing groove and a second fixing groove, the limiting part and the third outer sleeve part at least partially 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.

[0033] In some embodiments, a swing head pull rod is further included, wherein one side of the outer connector and the inner connector forms a pull rod channel, the swing head pull rod at least partially enters the pull rod channel, and the distal end of the swing head pull rod is fixed to the fixing part and the first outer sleeve part by the first fixing pin.

[0034] In some embodiments, a lubrication structure is provided between the inner connector and / or the outer connector.

[0035] In some embodiments, the inner connector and / or the outer connector are made of different materials.

[0036] In some embodiments, the receiving portion of the adapter is generally a hollow cylinder, and the central axis of the receiving portion coincides with the rotation center of the first rotary mating portion.

[0037] This invention also provides a medical stapler, including the aforementioned drive mechanism.

[0038] The drive mechanism and medical stapler provided by this invention have the following advantages:

[0039] This invention adds an adapter between the connector and the nail cartridge housing, forming a rotatable connection between the adapter and the nail cartridge housing. When the connector rotates, it drives the adapter to rotate relative to the nail cartridge housing, thereby enabling the connector to rotate more flexibly relative to the nail cartridge housing and allowing a larger rotation angle between the connector and the nail cartridge housing, thus improving the smoothness of the nail head swing. Attached Figure Description

[0040] 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.

[0041] Figure 1 This is a schematic diagram of the structure of the drive mechanism and the staple cartridge frame according to an embodiment of the present invention;

[0042] Figure 2 This is a schematic diagram of the structure of the drive mechanism and the cutter according to an embodiment of the present invention;

[0043] Figure 3 yes Figure 2 A schematic diagram showing the unfolded structure of the first nail box casing and other components;

[0044] Figure 4 This is a schematic diagram of the structure of the second nail box shell according to an embodiment of the present invention;

[0045] Figure 5 This is a schematic diagram of the structure of a connector according to an embodiment of the present invention;

[0046] Figure 6 and Figure 7 This is a schematic diagram of the structure of an adapter according to an embodiment of the present invention;

[0047] Figure 8 This is a schematic diagram of the structure of the pusher rod and the adapter in one embodiment of the present invention;

[0048] Figure 9 This is an exploded view of a connector according to an embodiment of the present invention;

[0049] Figure 10 This is a schematic diagram of the structure of an internal connector according to an embodiment of the present invention;

[0050] Figure 11 This is a schematic diagram of the structure of the external connector and the adapter in one embodiment of the present invention;

[0051] Figure 12 This is a schematic diagram of the structure of the first inner connecting member cooperating with the cutter and the pusher rod according to an embodiment of the present invention;

[0052] Figure 13 This is a bottom view of the connection member, the cutter, and the pusher rod in accordance with an embodiment of the present invention;

[0053] Figure 14 This is a schematic diagram of the connection between the connector and the swing head tie rod according to an embodiment of the present invention;

[0054] Figure 15 This is an exploded view of the connection between the connector and the swing head tie rod according to an embodiment of the present invention;

[0055] Figure 16 This is a front view of the adapter and firing lever in accordance with an embodiment of the present invention;

[0056] Figure 17 yes Figure 16 A sectional view along the A1-A1 direction;

[0057] Figure 18 yes Figure 16 A sectional view along the A2-A2 direction.

[0058] Figure label:

[0059] 1. Nail box outer shell 424 Third groove

[0060] 11 First nail box outer shell 43 Third outer shell

[0061] 113 First nail box hole; 431 Third mounting hole

[0062] 12 Second nail box outer shell 432 Third clearance groove

[0063] 121 First fixing slot 44 First external connector

[0064] 122 Second fixing slot 45 Second external connector

[0065] 1221 First gap 5 Adapter

[0066] 123 Second nail box hole 51 Fixing post

[0067] 2 First inner connecting part 511 First clearance groove

[0068] 21 First fixing part 52 Receiving part

[0069] 211 First fixing hole 531 First mounting hole

[0070] 213 Cutting groove 532 Second mounting hole

[0071] 214 Pin Hole 541 First Limiting Part

[0072] 22 First Deformation Section 5411 Second Displacement Groove

[0073] 221 First Embedded Part 5412 Inclined Surface

[0074] 222 First groove 542 Second limiting part

[0075] 23 First Limiting Section 5421 Second Gap

[0076] 3 Second inner connector 55 Second channel

[0077] 31 Second fixing part 62 Stapling frame

[0078] 311 Second fixing hole 621 Fixing sleeve

[0079] 32 Second deformation section 63 Cutting blade

[0080] 321 Second Embedded Part 7 Swinging Head Rod

[0081] 33 Second limiting part 71 Distal side of the oscillating lever

[0082] 4 External connectors 8 Firing lever

[0083] 41 First outer casing 81 Push blade

[0084] 411 Third fixing hole 91 First channel

[0085] 42 Second outer casing 92 Pull rod channel

[0086] 421 First Embedded Groove 93 First Fixing Pin

[0087] 422 Second Embedded Slot 94 Second Fixing Pin

[0088] 423 Second groove 95 Third fixing pin Detailed Implementation

[0089] 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.

[0090] 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 located 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; a connector, the distal end of which is connected to the staple head, the interior of which defines an axially extending first channel through which the firing lever passes; and an adapter, the adapter being connected proximal to the connector and rotatably connected to the distal end of the staple cartridge housing. Therefore, the present invention adds an adapter between the connector and the nail cartridge housing, forming a rotatable connection between the adapter and the nail cartridge housing. When the connector rotates, the adapter is driven to rotate relative to the nail cartridge housing, thereby enabling the connector to rotate more flexibly relative to the nail cartridge housing and allowing a larger rotation angle to be formed between the connector and the nail cartridge housing, thereby improving the smoothness of the nail head swing.

[0091] 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.

[0092] Figures 1-15The 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 cartridge holder. An 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 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. The staple head includes a staple cartridge assembly and an anvil disposed opposite each other. The staple cartridge assembly includes a staple cartridge for carrying staples, a staple cartridge holder 62 for carrying the staple cartridge, a firing block, and a cutter 63. The proximal side of the anvil and the proximal side of the staple cartridge 62 are rotatably connected.

[0093] 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 2 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.

[0094] like Figures 1-5As shown, the drive mechanism includes a staple cartridge housing, a firing rod 8, a connector, and an adapter 5. In this embodiment, the staple cartridge housing includes a first staple cartridge housing 11 located above and a second staple cartridge housing 12 located below, the staple cartridge housing being disposed on the distal side of the stapler body. The firing rod 8 is at least partially located inside the staple cartridge housing, and the firing rod 8 extends axially along the stapler body into the staple head to cooperate with a cutter 63 inside the staple head, the firing rod 8 being composed of a plurality of pusher blades 81. The distal side of the connector is connected to the staple head. The interior of the connector defines an axially extending first channel 91, the firing rod 8 passing through the first channel 91. In this embodiment, the connector includes an outer connector 4 and an inner connector located inside the outer connector 4, the inner connector including a first inner connector 2 located above and a second inner connector 3 located below. The anvil, the proximal fixing sleeve 62 of the staple cartridge 62, and the distal end of the first inner connector 2 are all connected by a pin.

[0095] The adapter 5 is fixedly connected to the proximal end of the outer connector 4, the proximal end of the first inner connector 2, and the proximal end of the second inner connector 3, and the adapter 5 is rotatably connected to the distal end of the nail cartridge housing. Specifically, the adapter 5 at least partially enters the interior of the nail cartridge housing. The adapter 5 includes a receiving portion 52 and a first rotating engagement portion located on the upper and / or lower surface of the receiving portion 52. The interior of the receiving portion 52 defines the second channel 55. The receiving portion 52 is generally a hollow cylinder, and the central axis of the receiving portion 52 coincides with the rotation center of the first rotating engagement portion. A second rotating engagement portion is provided on one side of the inner surface of the first nail cartridge housing 11 and / or the second nail cartridge housing 12. The first rotating engagement portion and the second rotating engagement portion form a rotatable fitting. Therefore, the first rotating engagement portion and the second rotating engagement portion are axially fixed but can rotate relative to each other. Thus, the adapter 5 is axially fixed and can rotate relative to the nail cartridge housing.

[0096] like Figure 6 and Figure 7 As shown, in this embodiment, the first rotating mating part is a fixing post 51 disposed on the upper and lower surfaces of the receiving part 52. The fixing post 51 is cylindrical, as shown in the figure. Figure 3 and Figure 4As shown, the second rotating fitting part includes a first nail cartridge hole 113 penetrating the first nail cartridge housing 11 and a second nail cartridge hole 123 penetrating the second nail cartridge housing 12. The fixing post 51 at least partially enters the first nail cartridge hole 113 and the second nail cartridge hole 123, and can rotate within the first nail cartridge hole 113 and the second nail cartridge hole 123. The rotation center of the adapter 5 is the rotation center of the fixing post 51, that is, the axis of the fixing post 51. In another alternative embodiment, the second rotating fitting part can also be a first nail cartridge groove provided on the inner surface of the first nail cartridge housing 11 and a second nail cartridge groove provided on the inner surface of the second nail cartridge housing 12. The fixing post 51 at least partially enters the first nail cartridge groove and the second nail cartridge groove, and can rotate within the first nail cartridge groove and the second nail cartridge groove. In another alternative embodiment, the first rotating engagement part may be a rotating fixing groove or rotating fixing hole disposed on the upper and / or lower surface of the receiving part 52, and the second rotating engagement part may be a fixing post disposed on the inner surface of the first nail box shell and / or the second nail box shell, wherein the fixing post at least partially enters the rotating fixing groove or rotating fixing hole and can rotate in the rotating fixing groove or rotating fixing hole.

[0097] like Figure 3 , Figure 6 and Figure 7 As shown, the receiving portion 52 includes a receiving cavity communicating with the second channel 55. The proximal side of the outer connector 4, the proximal side of the first inner connector 2, and the proximal side of the second inner connector 3 all at least partially enter the receiving cavity and are fixedly connected to the receiving portion 52.

[0098] The following is combined Figures 9-15 This embodiment describes the structure of the connector and the structure of the connection between the connector and the adapter 5. In existing stapler structures, when the staple head swings relative to the staple cartridge housing, the firing rod will bend to a certain extent; however, the bending deformation of the firing rod is difficult to control accurately. Furthermore, the firing rod is generally formed by stacking multiple pusher blades. When the firing rod bends, the stacked pusher blades will spread outwards at the bending point, causing the firing rod to deform significantly, resulting in a greater firing force and increasing the risk of surgical failure.

[0099] To address this technical problem, the connector in this embodiment further serves to prevent expansion and limit bending of the pusher rod. Specifically, the connector includes a fixing part, a deformation part, and a limiting part arranged sequentially from the distal end to the proximal end. The limiting part is fixedly connected to the receiving part 52 after at least partially entering the receiving cavity, and the fixing part is connected to the stapling head. When the stapling head swings axially relative to the stapler body, the firing rod 8 swings with the stapling head, and the deformation part deforms at least partially with the swing of the stapling head. The deformation part and the limiting part can limit the bending deformation of the firing rod 8 and prevent the pusher blade 81 from opening outward at the bending portion.

[0100] Specifically, in this embodiment, such as Figure 9 and Figure 10 As shown, the first inner connector 2 includes a first fixing part 21, a first deformable part 22, and a first limiting part 23, and the second inner connector 3 includes a second fixing part 31, a second deformable part 32, and a second limiting part 33. The distal end of the first fixing part 21 is provided with a cutter groove 213 communicating with the first channel 91. When the cutter 63 is in its initial position, it at least partially enters the cutter groove 213. The distal end of the first fixing part 21 is also provided with a pin hole 214. The first fixing part 21 is connected to the fixing sleeve 621 of the staple cartridge frame 62 and the proximal end of the anvil via a pin passing through the pin hole 214, thereby connecting the staple head to the staple cartridge housing. The first fixing part 21 and the second fixing part 31 constitute the fixing part, the first deformable part 22 and the second deformable part 32 constitute the deformable part, and the first limiting part 23 and the second limiting part 33 constitute the limiting part. The external connector 4 includes a first outer sleeve 41, a second outer sleeve 42, and a third outer sleeve 43 respectively sleeved on the outside of the fixing part 21, the deformable part, and the limiting part. The first fixing part 21, the second fixing part 31, and the first outer sleeve 41 are connected by at least one first fixing pin 93. The first fixing part 21, the second fixing part 31, and the first outer sleeve 41 are respectively provided with a first fixing hole 211, a second fixing hole 311, and a third fixing hole 411 passing through the first fixing pin 93.

[0101] In this embodiment, when the staple head swings axially relative to the stapler body, i.e., when the staple head swings laterally, the firing lever 8 swings with the staple head, and at least partially, the first deformation portion 22, the second deformation portion 32, and the second outer sleeve portion 42 deform with the swing of the staple head. Specifically, when the staple head swings axially relative to the stapler body towards a first side, at least partially, the first side of the first deformation portion 22, the second deformation portion 32, and the second outer sleeve portion 42 undergoes compressive deformation, and at least partially, the second side of the first deformation portion 22, the second deformation portion 32, and the second outer sleeve portion 42 undergoes tensile deformation. When the staple head swings axially relative to the stapler body towards a second side, at least partially, the first side of the first deformation portion 22, the second deformation portion 32, and the second outer sleeve portion 42 undergoes tensile deformation, and at least partially, the second side of the first deformation portion 22, the second deformation portion 32, and the second outer sleeve portion 42 undergoes compressive deformation. When the nail head swings relative to the axial direction, the first limiting part 23 and the second limiting part 33 do not deform, or although they deform, the deformation is less than that of the first deformable part 22 and the second deformable part 32. 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 deformable part 22, the second deformable part 32, the first limiting part 23, and the second limiting part 33, preventing excessive deformation. This effectively limits the deformation of the firing lever 8 and 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.

[0102] like Figure 9As 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.

[0103] like Figure 9 As shown, the second groove 423 extends laterally and connects the inner and outer surfaces of the second outer sleeve 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 face opposite directions to the ends of the plurality of second grooves 423.

[0104] like Figure 9 As shown, further, the left and right sides of the second outer sleeve 42 are also provided with third grooves 424. 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, and the fifth width is greater than the sixth width. The end of the third groove 424 is the end away from the axis, that is, the same orientation as the first groove 222 of the deformable part.

[0105] like Figure 9As shown, the outer connector 4 includes a first outer connector 44 and a second outer connector 45 arranged laterally. The first outer connector 44 and the second outer connector 45 together form the first outer sleeve 41, the second outer sleeve 42, and the third outer sleeve 43. The distal ends of the first outer connector 44 and the second outer connector 45 are respectively connected to the inner connector by a first fixing pin 93. In this embodiment, by setting two outer connectors 4, the second outer sleeve 42 of the outer connector 4 can better adapt to the bending and deformation of the firing rod 8 when the nail head swings, and it is also easier to assemble the outer connector 4 with the first inner connector 2 and the second inner connector 3.

[0106] The first limiting part 23, the second limiting part 33, and the third outer sleeve part 43 are at least partially inserted into the receiving cavity and then fixedly connected to the receiving part 52. Specifically, as shown... Figures 11-13 As shown, the upper and lower walls of the receiving cavity of the receiving portion 52 are provided with a first mounting hole 531 and a second mounting hole 532. A second fixing pin 94 passes through the first mounting hole 531, and a third fixing pin 95 passes through the second mounting hole 532. The third fixing pin 95 is located on the proximal side of the second fixing pin 94. The proximal surfaces of the first limiting portion 23 and the second limiting portion 33 protrude in a proximal direction relative to the proximal surface of the third outer sleeve portion 43. The third outer sleeve portion 43 is provided with a third mounting hole 431, and the second fixing pin 94 passes through the third mounting hole 431. The third outer sleeve portion 43, the first limiting portion 23, and the second limiting portion 33 are all connected to the receiving portion 52 by the second fixing pin 94. The portions of the first limiting portion 23 and the second limiting portion 33 that protrude from the third outer sleeve portion 43 are connected to the receiving portion 52 by the third fixing pin 95. In this embodiment, the second retaining pin 94 is located further away from the axis than the third retaining pin 95, such that the rotational curvature of the third outer sleeve 43 is greater than that of the first limiting portion 23 and the second limiting portion 33. In another alternative embodiment, the third retaining pin may be omitted, and only the second retaining pin 94 may be provided; that is, the third outer sleeve 43, the first limiting portion 23, and the second limiting portion 33 are fixed to the nail box housing 1 by the second retaining pin 94. The proximal ends of the first limiting portion 23 and the second limiting portion 33 may not protrude beyond the proximal end of the third outer sleeve 43.

[0107] Both the first limiting part 23 and the second limiting part 33 are provided with through holes through which the second fixing pin 94 and the third fixing pin 95 pass. A first limiting part 541 and a second limiting part 542 (to be referenced together) are provided on the proximal side of the receiving cavity. Figure 6and Figure 7 The first limiting portion 541 is located at the distal end of the second limiting portion 542. The first limiting portion 541 faces the proximal surface of the third outer sleeve portion 43, and the second limiting portion 542 faces the proximal surfaces of the first limiting portion 23 and the second limiting portion 33. The distal surface of the first limiting portion 541 may abut against the proximal surface of the third outer sleeve portion 43, or there may be a certain gap between them. The distal surface of the second limiting portion 542 may abut against the proximal surfaces of the first limiting portion 23 and the second limiting portion 33, or there may be a certain gap between them.

[0108] like Figure 11 and Figure 12 As shown, a first clearance groove 511 is provided at the position opposite to the third fixing pin 95 on the fixing post 51. The first clearance groove 511 is an arc-shaped groove adapted to the shape of the outer wall of the third fixing pin 95. A second clearance groove 5411 is provided on the distal end face of the first limiting part 541, and the third fixing pin 95 at least partially enters the interior of the second clearance groove 5411. A third clearance groove 432 is provided on the proximal side of the third outer sleeve part 43, and the third fixing pin 95 at least partially enters the interior of the third clearance groove 432. A substantially cylindrical space is formed between the second clearance groove 5411 and the third clearance groove 432 for the third fixing pin 95 to pass through.

[0109] In this embodiment, at least one side of the second outer sleeve 42 is provided with an axially extending first insert fitting portion, and at least one side of the deformable portion is provided with an axially extending second insert fitting portion, the second insert fitting portion and the first insert fitting portion forming an interlocking fit. Specifically, as shown... Figure 9 and Figure 13As shown, the first insert fitting portion includes a first insert groove 421 and a second insert groove 422 disposed on both sides of the second outer sleeve portion 42. The inner surfaces of the first insert groove 421 and the second insert groove 422 are respectively formed with a second groove 423. The second insert fitting portion includes a first insert portion 221 disposed above the first deformable portion 22 and a second insert portion 321 disposed below the second deformable portion 32. The first insert portion 221 is embedded in the first insert groove 421, and the second insert portion 321 is embedded in the second insert groove 422. Thus, a non-rotatable connection is formed between the first deformable portion 22, the second deformable portion 32, and the second outer sleeve portion 42. In another alternative embodiment, the upper surface of the first deformable portion 22 may be provided with an axially extending first insert groove, the lower surface of the second deformable portion 32 may be provided with an axially extending second insert groove, the inner surface of the upper sidewall of the second outer sleeve portion 42 may be provided with a first insert portion embedded in the first insert groove, and the inner surface of the lower sidewall may be provided with a second insert portion embedded in the second insert groove.

[0110] In this embodiment, such as Figure 3 and Figure 4 As shown, the interior of the second nail cartridge housing 12 is provided with a first fixing groove 121 and a second fixing groove 122. The interior of the first nail cartridge housing 11 is structurally symmetrical with that of the second nail cartridge housing 12, that is, the inner surface of the first nail cartridge housing 11 also forms a first fixing groove and a second fixing groove corresponding to the first fixing groove 121 and the second fixing groove 122. The first limiting part 23, the second limiting part 33 and the third outer sleeve part 43 at least partially 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. 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 1221 between the outer side wall of the second outer sleeve part 42 and the inner side wall of the second fixing groove 122, so as to provide a certain deformation space for the second outer sleeve part 42, the first deformable part 22 and the second deformable part 32.

[0111] like Figure 14 and Figure 15As shown, in this embodiment, the drive mechanism further includes a swing head pull rod 7. One side of the outer connecting member 4, the first inner connecting member 2, and the second inner connecting member 3 forms a pull rod channel 92. The swing head pull rod 7 passes through the pull rod channel 92, and the distal end 71 of the swing head pull rod 7 is fixed to the first fixing part 21, the second fixing part 22, and the first outer sleeve part 41 by the first fixing pin 93. Specifically, one first fixing pin 93 simultaneously passes through the first fixing part 21, the second fixing part 31, the first outer sleeve part 41, and the distal end 71 of the swing head pull rod 7. By controlling the axial movement of the swing head pull rod 7, the first fixing part 21 and the second fixing part 31 can be driven to swing relative to the nail cartridge housing, thereby causing the nail head to swing relative to the nail cartridge housing.

[0112] like Figures 16-18 The diagram shows the structural schematic of the adapter 5 and the firing lever 8 in this embodiment. In the receiving portion 52 of the adapter 5, the first limiting portion 541 and the second limiting portion 542 jointly define the second channel through which the firing lever 8 passes, so that the adapter 5 will not interfere with the firing lever 8. Further, as shown... Figure 17 As shown, to ensure that the adapter 5 does not interfere with the firing lever 8 during rotation, the surface of the first limiting part 541 opposite to the firing lever 8 is an inclined surface 5412. The proximal side of the inclined surface 5412 is inclined outward relative to the distal side. When the first limiting part 541 rotates, the inclined surface 5412 creates a clearance for the firing lever 8, ensuring that the first limiting part 541 will not interfere with the firing lever 8 even when rotating. This inclined surface 5412 can be an arc surface or an inclined plane. Further, as... Figure 18 As shown, there is a large second gap 5421 between the second limiting part 542 and the firing lever 8. Due to the existence of the second gap 5421, the second limiting part 542 will not interfere with the firing lever 8 even if it rotates. Therefore, by adopting Figures 16-18 The structure shown ensures that even if the adapter 5 rotates, it will not affect the smoothness of the firing lever 8's movement.

[0113] In the above embodiments, the connector includes an inner connector and an outer connector. The inner connector includes a first inner connector and a second inner connector, and the outer connector includes a first outer connector and a second outer connector. The first inner connector and the second inner connector can be made of the same material, and the first outer connector and the second outer connector can be made of the same material. The inner connector and the outer connector can be made of the same or different materials. In other alternative embodiments, the inner connector may 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. In some other alternative embodiments, the first outer connector and the second outer connector may be an integrally formed structure. In still some alternative embodiments, the connector may include only the inner connector and not the outer connector, and the connector is a whole, with the proximal end of the connector entering the interior of the receiving cavity and connecting to the receiving part. These alternative embodiments are all within the protection scope of this invention.

[0114] In the above embodiments, 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 may be made of medical-grade plastics such as polyvinyl chloride (PVC), polyethylene (PE), or polypropylene (PP). 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, or between the first outer connector, the second outer connector and the inner 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.

[0115] 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 located 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; A connector includes a fixing part, a deformable part, and a limiting part arranged sequentially from the distal end to the proximal end. The fixing part of the connector is connected to the head of the staple. The interior of the connector defines an axially extending first channel. The firing rod passes through the first channel. When the head of the staple swings axially relative to the staple body, the firing rod swings with the head of the staple. The deformable part deforms at least partially with the swing of the head of the staple. An adapter, at least partially inserted into the interior of the nail cartridge housing, is connected to the defining portion of the connector, and is rotatably connected to the distal end of the nail cartridge housing.

2. The driving mechanism according to claim 1, characterized in that, The adapter internally defines a second channel, through which the firing lever passes.

3. The driving mechanism according to claim 2, characterized in that, The adapter includes a receiving portion and a first rotating engagement portion located on at least one side of the receiving portion. The interior of the receiving portion defines the second channel. A second rotating engagement portion is provided on one side of the inner surface of the nail box housing. The first rotating engagement portion and the second rotating engagement portion form a rotatable fitting.

4. The driving mechanism according to claim 3, characterized in that, The first rotating engagement part is a fixing post disposed on the upper and / or lower surface of the receiving part; the second rotating engagement part is a nail magazine groove disposed on the inner surface of the nail magazine housing, or a nail magazine hole penetrating the nail magazine housing; the fixing post at least partially enters the nail magazine groove; or, The first rotating fitting part is a rotating fixing groove or rotating fixing hole provided on the upper and / or lower surface of the receiving part, and the second rotating fitting part is a fixing post provided on the inner surface of the nail box shell, wherein the fixing post at least partially enters the rotating fixing groove or rotating fixing hole.

5. The driving mechanism according to claim 3, characterized in that, The receiving portion includes a receiving cavity communicating with the second channel, the proximal side of the connector at least partially enters the receiving cavity, and the proximal side of the connector is fixedly connected to the receiving portion.

6. The driving mechanism according to claim 5, characterized in that, The limiting part is fixedly connected to the receiving cavity after at least part of it enters the receiving cavity.

7. The driving mechanism according to claim 6, characterized in that, The connector includes an inner connector and an outer connector. The inner connector includes the fixing part, the deformable part, and the limiting part. The outer connector includes a first outer sleeve, a second outer sleeve, and a third outer sleeve respectively sleeved on the outside of the fixing part, the deformable part, and the limiting part. The fixing part and the first outer sleeve are connected by a first fixing pin. The limiting part and the third outer sleeve are fixedly connected to the receiving part after at least partially entering the receiving cavity.

8. The driving mechanism according to claim 7, characterized in that, The proximal end face of the limiting portion protrudes in the proximal direction relative to the proximal end face of the third outer sleeve portion. The third outer sleeve portion and the limiting portion are connected to the receiving portion by a second fixing pin, and the portion of the limiting portion protruding from the third outer sleeve portion is connected to the receiving portion by a third fixing pin.

9. The driving mechanism according to claim 8, characterized in that, The second retaining pin is located further away from the axis than the third retaining pin.

10. The driving mechanism according to claim 7, characterized in that, The third outer sleeve and the limiting part are connected to the receiving part by a second fixing pin.

11. The driving mechanism according to claim 8, characterized in that, A first clearance groove is provided at the position opposite to the third fixing pin of the first rotating mating part.

12. The driving mechanism according to claim 8, characterized in that, The accommodating cavity is provided with a first limiting part and a second limiting part on its proximal side. The first limiting part is located on the distal side of the second limiting part. The first limiting part is opposite to the proximal surface of the third outer sleeve, and the second limiting part is opposite to the proximal surface of the limiting part.

13. The driving mechanism according to claim 12, characterized in that, The distal end face of the first limiting part is provided with a second clearance groove, and the third fixing pin at least partially enters the interior of the second clearance groove; and / or, A third clearance groove is provided on the proximal side of the third outer sleeve, and the third fixing pin at least partially enters the interior of the third clearance groove.

14. The driving mechanism according to claim 12, characterized in that, The surface of the first limiting part opposite to the firing rod is an inclined surface; and / or, there is a second gap between the second limiting part and the firing rod.

15. The driving mechanism according to claim 8, characterized in that, The inner connector includes a first inner connector and a second inner connector arranged longitudinally. The first inner connector includes a first fixing part, a first deformable part, and a first limiting part. The second inner connector includes a second fixing part, a second deformable part, and a second limiting part. The first fixing pin passes through the first outer sleeve, the first fixing part, and the second fixing part. The second fixing pin passes through the third outer sleeve, the first limiting part, and the second limiting part. The third fixing pin passes through the portion of the first limiting part and the second limiting part that protrudes from the third outer sleeve.

16. The driving mechanism according to claim 7, characterized in that, The external connector includes a first external connector and a second external connector arranged laterally, and the first external connector and the second external connector together form the first outer cover, the second outer cover and the third outer cover.

17. The driving mechanism according to claim 7, characterized in that, The second outer sleeve has at least one side provided with an axially extending first insert fitting portion, and the deformable portion has at least one side provided with an axially extending second insert fitting portion, the second insert fitting portion and the first insert fitting portion forming an interlocking fit.

18. The driving mechanism according to claim 17, characterized in that, The first embedded mating part is an embedded groove, the second embedded mating part is an embedded part, and the side of the deformable part is formed with a plurality of first grooves. The first grooves extend in the transverse 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. The first width is greater than the second width. The inner side of the embedded groove is formed with a plurality of second grooves, the second grooves extend in the lateral direction, and the ends of the plurality of second grooves are independent free ends. The second grooves have a third width near the axis and a fourth width away from the axis, and 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.

19. The driving mechanism according to claim 18, characterized in that, The left and right sides of the second outer sleeve are respectively provided with third grooves, and 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.

20. The driving mechanism according to claim 7, characterized in that, The nail box shell has a first fixing groove and a second fixing groove inside. The limiting part and the third outer sleeve part at least partially enter the first fixing groove, and 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 wall of the second outer sleeve part and the inner wall of the second fixing groove.

21. The driving mechanism according to claim 7, characterized in that, It also includes a swing head pull rod, wherein one side of the outer connector and the inner connector forms a pull rod channel, the swing head pull rod at least partially enters the pull rod channel, and the distal end of the swing head pull rod is fixed to the fixing part and the first outer sleeve part by the first fixing pin.

22. The driving mechanism according to claim 7, characterized in that, A lubrication structure is provided between the inner connector and / or the outer connector.

23. The driving mechanism according to claim 7, characterized in that, The inner connector and / or the outer connector are made of different materials.

24. The driving mechanism according to claim 3, characterized in that, The receiving portion of the adapter is a hollow cylinder, and the central axis of the receiving portion coincides with the rotation center of the first rotary mating portion.

25. A medical stapler, characterized in that, Includes the drive mechanism according to any one of claims 1 to 24.

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