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; and a first connecting member including a first fixing part, a first mating part, and a second fixing part sequentially arranged from the distal to the proximal side. The first connecting member defines an axially extending first channel, through which the firing rod passes. The first fixing part is connected to the proximal side of the staple head, and the second fixing part is connected to the staple cartridge housing. When the staple head oscillates axially relative to the stapler body, the firing rod oscillates with the staple head, and the first mating part deforms at least partially with the oscillation of the staple head. This invention effectively limits the deformation of the firing rod by providing a first mating part that mates with the firing rod on the proximal side of the first connecting member.

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] To address 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 housing through a first connector, and provides a first mating part that cooperates with the firing rod through the first connector, thereby effectively limiting 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 first connector includes a first fixing part, a first mating part, and a second fixing part arranged sequentially from the distal end to the proximal end. The first connector defines an axially extending first channel, and the firing rod passes through the first channel. The first fixing part is connected to the proximal end of the nail head, and the second fixing part is connected to the nail cartridge housing.

[0010] When the staple head swings axially relative to the stapler body, the firing rod swings with the staple head, and the first mating part deforms at least partially with the swing of the staple head.

[0011] 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 mating part undergoes compressive deformation on the first side and at least a portion of the second side of the first mating part undergoes tensile deformation.

[0012] When the staple head swings axially toward the second side relative to the stapler body, at least part of the first mating part undergoes tensile deformation, and at least part of the second mating part undergoes compressive deformation.

[0013] In some embodiments, the first mating part includes a first deformable part and a first limiting part, the first limiting part being connected between the first deformable part and the second fixing part; when the nail head swings axially relative to the stapler body, the firing rod swings with the nail head, the first deformable part at least partially deforms with the swing of the nail head, the first limiting part deforms, and the deformation of the first limiting part is less than the deformation of the first deformable part.

[0014] In some embodiments, the first deformed portion has a plurality of first grooves.

[0015] In some embodiments, the first groove is an arcuate groove radiating outward from the central axis of the first deformed portion, or the first groove extends in the lateral direction.

[0016] In some embodiments, the distance between the two outer sidewalls of the first defining portion is less than the distance between the two outer sidewalls of the first deformable portion.

[0017] In some embodiments, the distance between the two outer side walls of the second fixing part is greater than the distance between the two outer side walls of the first limiting part; a first fixing groove is provided on the distal side of the nail box shell, and the second fixing part is fixedly disposed in the first fixing groove.

[0018] In some embodiments, the distal end of the first fixing groove at least partially accommodates the first defining portion, and there is a first gap between the two outer sidewalls of the first defining portion and the inner sidewall of the first fixing groove.

[0019] The proximal end of the first fixing groove accommodates the second fixing part. A first stepped surface is provided between the distal end and the proximal end of the first fixing groove. A second stepped surface is provided at the proximal end of the first fixing groove. The distal end of the second fixing part abuts against the first stepped surface, and the proximal end of the second fixing part abuts against the second stepped surface.

[0020] In some embodiments, a second fixing groove is further provided on the distal side of the nail box shell, the first deformable part at least partially enters the second fixing groove, the width of the second fixing groove is greater than the width of the first fixing groove, and a third gap is formed between the two outer sidewalls of the first deformable part and the inner sidewall of the second fixing groove.

[0021] In some embodiments, the sidewall of the first deformable portion and / or the sidewall of the first defining portion are further provided with an insert.

[0022] In some embodiments, a second connector is further included, the second connector including a third fixing part, a second mating part and a fourth fixing part arranged sequentially from the distal end to the proximal end, the third fixing part, the second mating part and the fourth fixing part being respectively connected to the first fixing part, the first mating part and the second fixing part, and the second connector and the first connector together define the first channel;

[0023] When the staple head swings axially relative to the stapler body, the second mating part deforms at least partially with the swing of the staple head.

[0024] In some embodiments, the first fixing part is provided with a first hole, and the third fixing part is provided with a first fixing post embedded in the first hole; or, the third fixing part is provided with a first hole, and the first fixing part is provided with a first fixing post embedded in the first hole.

[0025] The second fixing part is provided with a second hole, and the fourth fixing part is provided with a second fixing post embedded in the second hole; or, the fourth fixing part is provided with a second hole, the second fixing part is provided with a second fixing post embedded in the second hole, and the second connecting member is axially fixedly connected to the first connecting member.

[0026] In some embodiments, the first fixing post is a rectangular fixing post extending in the lateral direction, and the second fixing post is a rectangular fixing post extending in the axial direction.

[0027] In some embodiments, the second mating portion includes a second deformable portion and a second limiting portion, the second deformable portion and the second limiting portion being respectively connected to the first deformable portion and the second limiting portion; the distance between the two outer sidewalls of the second limiting portion is less than the distance between the two outer sidewalls of the second deformable portion.

[0028] In some embodiments, the first deformable part has a third hole, the second deformable part has a fourth hole, the third hole and the fourth hole are connected vertically, and a second channel extending axially is provided on one side of the first connector.

[0029] The drive mechanism also includes a swing head rod and a tie pin. The distal end of the swing head rod enters the second channel, and the tie pin passes through the third hole, the distal end of the swing head rod, and the fourth hole.

[0030] In some embodiments, the first connector is located on the side of the second connector away from the bottom surface of the nail head, and the height of the first connector is greater than the height of the second connector.

[0031] In some embodiments, the inner wall of the first mating part is provided with a mating groove, and the inner side of the second mating part is provided with a reinforcing member extending axially, the reinforcing member being embedded in the mating groove.

[0032] In some embodiments, a cutter is provided on the proximal side of the nail head, and a first cutter groove and a second cutter groove are provided on the distal sides of the first fixing part and the third fixing part, respectively. The first cutter groove and the second cutter groove are both connected to the first channel, and in the initial state, the cutter part enters the first cutter groove and the second cutter groove.

[0033] In some embodiments, a lubrication structure is provided between the first connector and the second connector.

[0034] In some embodiments, the nail head includes a nail cartridge holder, and the distal end of the first fixing portion of the first connector is connected to the proximal end of the nail cartridge holder via a connecting pin.

[0035] In some embodiments, a retaining sleeve is provided on the proximal side of the staple cartridge, and the first retaining portion at least partially enters the interior of the retaining sleeve.

[0036] This invention also provides a medical stapler, including the aforementioned drive mechanism.

[0037] The drive mechanism and medical stapler provided by this invention have the following advantages:

[0038] This invention provides a drive mechanism for a medical stapler. A first mating part is provided in a first connecting member. When the staple head swings relative to the stapler body, the firing rod also bends with the swing of the staple head. The first mating part also bends in the same direction, and provides a limiting and retaining effect on the firing rod during bending. The firing rod is restricted by the first mating part and will not produce excessive deformation, effectively limiting the deformation of the firing rod. Furthermore, when the firing rod is composed of multiple pusher blades stacked together, due to the limiting and retaining effect of the first mating part, the multiple pusher blades will not spread outward when the firing rod bends, improving the surgical effect. Attached Figure Description

[0039] 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.

[0040] Figure 1 This is a partial schematic diagram of the stapler according to the first embodiment of the present invention;

[0041] Figure 2 This is a schematic diagram of the engagement of the nail head and the connector according to the first embodiment of the present invention;

[0042] Figure 3 This is a schematic diagram of the engagement between the anvil housing and the staple cartridge frame according to the first embodiment of the present invention;

[0043] Figure 4 This is a schematic diagram of the cooperation between the first connector and the second connector according to the first embodiment of the present invention;

[0044] Figure 5 This is a schematic diagram of the structure of the first connector according to the first embodiment of the present invention;

[0045] Figure 6 This is a schematic diagram of the connection member and the nail box shell in the first embodiment of the present invention.

[0046] Figure 7 This is a schematic diagram of the connection between the connector and the firing lever according to the first embodiment of the present invention;

[0047] Figure 8 This is a schematic diagram of the connection between the connector and the swing head tie rod according to the first embodiment of the present invention;

[0048] Figure 9 This is a schematic diagram of the connection member and the nail box housing in the second embodiment of the present invention;

[0049] Figure 10 and Figure 11 This is a schematic diagram of the structure of the second nail box shell according to the second embodiment of the present invention;

[0050] Figure 12This is a schematic diagram of the structure of the first connector according to the second embodiment of the present invention;

[0051] Figure 13 This is a schematic diagram of the structure of the second connector according to the second embodiment of the present invention;

[0052] Figure 14 This is a schematic diagram of the connector according to the third embodiment of the present invention;

[0053] Figure 15 This is a schematic diagram of the structure of the insert according to the third embodiment of the present invention.

[0054] Figure label:

[0055] 1. Nail box outer shell 32. Second deformation part

[0056] 11 First nail box outer shell 321 Fourth hole

[0057] 12 Second nail box outer shell 322 Second groove

[0058] 121 First fixing groove 33 Second limiting part

[0059] 1211 First step surface 331 Reinforcing member

[0060] 1212 Second step surface 34 Fourth fixing part

[0061] 122 Second fixing groove 341 Second fixing column

[0062] 2 First connector 4 First channel

[0063] 21 First fixing part 5 Firing lever

[0064] 211 First hole 51 Push blade

[0065] 212 Second pin hole 6 Pin head

[0066] 213 First cutting groove 61 Spiral cartridge

[0067] 22 First Deformation Section 62 Stapling Frame

[0068] 221 Third hole 621 Fixing sleeve

[0069] 222 First groove 622 First pin hole

[0070] 23 First limiting part 623 Connecting column

[0071] 231 Mating groove 63 Cutting blade

[0072] 24 Second fixing part 64 Anvil housing

[0073] 241 Second hole 641 Third pin hole

[0074] 25 Insert 65 Connecting Pin

[0075] 26 Second Channel 66 Connecting Rod

[0076] 3 Second connector 661 through hole

[0077] 31 Third fixing part 67 Anvil body

[0078] 311 First fixed column 71 Swing head tie rod

[0079] 312 Second cutting groove 72 Pull rod pin Detailed Implementation

[0080] 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.

[0081] 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; and a first connector including a first fixing portion, a first mating portion, and a second fixing portion sequentially arranged from the distal to the proximal side, wherein the first connector defines an axially extending first channel through which the firing lever passes, the first fixing portion is connected to the proximal side of the staple head, and the second fixing portion is connected to the staple cartridge housing. When the nail head swings axially relative to the stapler body, the firing rod swings with the nail head. The first mating part deforms at least partially with the swing of the nail head, and the firing rod is restricted by the first mating part so as not to produce excessive deformation, thereby effectively limiting the deformation of the firing rod.

[0082] 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.

[0083] Figures 1-8 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 As 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 the staples, a staple cartridge holder 62 for carrying the staple cartridge 61, a firing block (not shown in the figure), and a cutter 63 (see Figure 64). Figure 6 The anvil includes an anvil housing 64 and an anvil body 67, the proximal end of the anvil housing 64 being rotatably connected to the proximal end of the staple cartridge 62.

[0084] 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 6 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.

[0085] like Figures 1-6As shown, the drive mechanism includes a nail magazine housing 1, a firing lever 5, and a first connecting member 2. The nail magazine housing 1 is connected between the nail head 6 and the stapler body. In this embodiment, the nail magazine housing 1 includes a first nail magazine housing 11 and a second nail magazine housing 12, the interiors of which together define an accommodating space. The firing lever 5 is composed of a plurality of pusher blades 51 arranged in the transverse direction ( Figure 6 The components are stacked sequentially in the S3 direction. The firing rod 5 is at least partially located inside the receiving space of the staple cartridge housing 1, and the firing rod 5 extends axially along the staple body into the staple head 6 to cooperate with the cutter 63 in the staple head 6. Figure 4 and Figure 5 As shown, the first connector 2 includes a first fixing part 21, a first mating part, and a second fixing part 24 arranged sequentially from the distal side to the proximal side. The first connector 2 defines an axially extending first channel 4. The firing rod 5 passes through the first channel 4 and enters the staple head 6 after passing through the first channel 4, engaging with the cutter 63 inside the staple head 6. When the stapler is fired, the firing rod 5 is driven to move towards the distal side of the stapler, driving the cutter 63 to move towards the distal side. The cutter 63 drives the firing block in the staple cartridge assembly to move towards the distal side to push the staples out of the staple cartridge 61. Simultaneously, the cutter 63 cuts the tissue, achieving suturing and cutting of the tissue. The first fixing part 21 is connected to the proximal side of the staple head 6, and the second fixing part 24 is connected to the staple cartridge housing 1. When the staple head 6 swings axially relative to the stapler body, the firing rod 5 swings with the staple head 6, and the first mating part deforms at least partially with the swing of the staple head 6.

[0086] like Figure 5As shown, the first mating part includes a first deformable part 22 and a first limiting part 23. The first limiting part 23 is an elastic arm extending from the proximal side of the first deformable part 22 to the proximal side. The distance between the two outer sidewalls of the first limiting part 23 is less than the distance between the two outer sidewalls of the first deformable part 22, that is, the width of the first deformable part 22 is greater than the width of the first limiting part 23. The elasticity of the first limiting part 23 is less than the elasticity of the first deformable part 22. Therefore, when the staple head 6 swings axially relative to the stapler body, the first deformable part 22 deforms at least partially with the swing of the staple head 6, and the first limiting part 23 deforms, but the deformation is less than that of the first deformable part 22. Thus, the firing lever 5 is limited by the first deformable part 22 and the first limiting part 23 and does not produce excessive deformation, thereby effectively limiting the deformation of the firing lever 5 and preventing the multiple pusher blades 51 from opening up to each other when bent, thus improving the surgical effect. 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.

[0087] Specifically, in this embodiment, when the staple head 6 swings axially toward a first side relative to the stapler body, at least a portion of the first side of the first deformable portion 22 and the first limiting portion 23 undergoes compressive deformation, and at least a portion of the second side of the first deformable portion 22 and the first limiting portion 23 undergoes tensile deformation. When the staple head 6 swings axially toward a second side relative to the stapler body, at least a portion of the first side of the first deformable portion 22 and the first limiting portion 23 undergoes tensile deformation, and at least a portion of the second side of the first deformable portion 22 and the first limiting portion 23 undergoes compressive deformation. Because the width of the first deformable portion 22 is relatively large, in order to further improve the deformation capacity of the first deformable portion 22 and avoid the first deformable portion 22 affecting the smoothness of the staple head 6 swinging, a plurality of first grooves 222 are provided on the first deformable portion 22. In this embodiment, the first grooves 222 are arcuate grooves radiating outward from the central axis of the first deformable portion 22, increasing the deformation capacity of the proximal portion of the first deformable portion 22.

[0088] like Figure 2 and Figure 4 As shown, in this embodiment, the driving mechanism further includes a second connecting member 3, which is axially fixedly connected to the first connecting member 2. In this embodiment, the first connecting member 2 is located on the side of the second connecting member 3 away from the bottom surface of the nail head 6 (i.e., Figure 2From the perspective of [the viewpoint], the first connector 2 is located above the second connector 3), and the height of the first connector 2 is greater than the height of the second connector 3. By dividing the connector between the staple head 6 and the staple cartridge housing 1 into two parts, it is easier to manufacture and process, and it is also easier to assemble the connector with the staple head 6 and the staple cartridge housing 1. The second connector 3 includes a third fixing part 31, a second mating part, and a fourth fixing part 34 arranged sequentially from the distal end to the proximal end. The third fixing part 31, the second mating part, and the fourth fixing part 34 are respectively connected to the first fixing part 21, the first mating part, and the second fixing part 24. The second connector 3 and the first connector 2 together define the first channel 4. When the staple head 6 swings axially relative to the stapler body, the second mating part deforms at least partially with the swing of the staple head 6. Figure 4 As shown, the second mating part includes a second deformable part 32 and a second limiting part 33, which are respectively connected to the first deformable part 22 and the first limiting part 23. The distance between the two outer sidewalls of the second limiting part 33 is less than the distance between the two outer sidewalls of the second deformable part 32, that is, the width of the second limiting part 33 is less than the width of the second deformable part 32. The second limiting part 33 is an elastic arm extending from the proximal end side of the second deformable part 32 towards the proximal end side. To further improve the deformation capability of the second deformable part 32, the second deformable part 32 is further provided with a plurality of second grooves 322. In this embodiment, the second grooves 322 are strip-shaped grooves parallel to the transverse direction, and at least a portion of the second grooves 322 can extend to the outer sidewalls to further improve the deformation capability of the second deformable part 32 and improve the smoothness of the nail head 6 swinging. When the staple head 6 swings axially relative to the stapler body, the second deformation part 32 and the second limiting part 33 deform at least partially with the swing of the staple head 6, and the firing rod 5 is limited by the second deformation part 32 and the second limiting part 33 to prevent excessive deformation. Thus, the deformation of the firing rod 5 is effectively limited by the combined action of the first and second mating parts, and the multiple pusher blades 51 are prevented from opening up to each other when bent, thereby improving the surgical effect.

[0089] Figure 2 and Figure 3The diagram illustrates the connection method of the anvil housing 64, the staple cartridge holder 62, the first connector 2, and the second connector 3. The distal end of the first fixing portion 21 of the first connector 2 is connected to the proximal end of the staple cartridge holder 62 via a connecting pin 65. Specifically, a first pin hole 622 is provided on the proximal end of the staple cartridge holder 62, a third pin hole 641 is provided on the proximal end of the anvil housing 64, and a second pin hole is provided on the first fixing portion 21 of the first connector 2. The connecting pin 65 passes sequentially through the third pin hole 641, the first pin hole 622, and the second pin hole. Further, a fixing sleeve 621 is provided on the proximal end of the staple cartridge holder 62, and at least partially, the first fixing portion 21 and the third fixing portion 31 enter the interior of the fixing sleeve 621. Further, portions of the first deformable portion 22 and the second deformable portion 32 can also enter the interior of the fixing sleeve 621. Therefore, when the staple head 6 swings relative to the stapler body, the staple head 6 simultaneously drives the distal ends of the first connector 2 and the second connector 3 to swing, causing the first deformable part 22, the first limiting part 23, the second deformable part 32 and the second limiting part 33 to deform.

[0090] like Figure 3 and Figure 4 As shown, multiple matching connection structures are provided between the first connector 2 and the second connector 3. In this embodiment, the first fixing part 21 is provided with multiple first holes 211, which can be blind holes or through holes. The third fixing part 31 is provided with multiple first fixing posts 311 embedded in the first holes 211. Furthermore, the first fixing posts 311 are rectangular fixing posts extending in the lateral direction, which can effectively prevent the first fixing part 21 from rotating relative to the third fixing part 31 when the staple head 6 rotates relative to the stapler body, maintaining the stability of the connection and alignment between the first fixing part 21 and the second fixing part 24. In another alternative embodiment, the third fixing part 31 may also be provided with first holes 211, and the first fixing part 21 may be provided with first fixing posts 311 embedded in the first holes 211. In yet another alternative embodiment, the first fixing posts 311 may also be rectangular fixing posts extending in the axial direction. Alternatively, the first fixing post 311 can also adopt other shapes, such as a column with a trapezoidal, triangular, or cross-shaped cross section, to increase the stability of the fit between the first connector 2 and the second connector 3.

[0091] like Figure 3 and Figure 4As shown, the second fixing part 24 is provided with a second hole 241, which can be a blind hole or a through hole. The fourth fixing part 34 is provided with a second fixing post 341 embedded in the second hole 241. The second fixing post 341 is a rectangular fixing post extending axially. When the staple head 6 rotates relative to the stapler body, it can effectively prevent the second fixing part 24 from rotating relative to the fourth fixing part 34, maintaining the stability of the connection and alignment between the second fixing part 24 and the fourth fixing part 34. In another alternative embodiment, the fourth fixing part 34 may also be provided with a second hole 241, and the second fixing part 24 may be provided with a second fixing post 341 embedded in the second hole 241. In yet another alternative embodiment, the second fixing post 341 may also take other shapes, such as a column with a trapezoidal, triangular, or cross-shaped cross section.

[0092] In this embodiment, since the wall thickness of the first limiting part 23 is relatively thin, in order to ensure that the first limiting part 23 limits the deformation of the firing rod 5, a reinforcing member 331 is further provided on the inner side of the first limiting part 23. Specifically, a mating groove 231 is provided on the inner wall of the first limiting part 23, and an axially extending reinforcing member 331 is provided on the inner side of the second limiting part 33. The reinforcing member 331 protrudes towards the first connecting member 2 relative to the surface of the second limiting part 33. The reinforcing member 331 is embedded in the mating groove 231, thereby strengthening the structural strength of the first limiting part 23.

[0093] Figure 6 The diagram illustrates the mating structure of the first connector 2, the second connector 3, the nail box housing 1, and the cutter 63 in this embodiment. Figure 6 To clearly illustrate the mating relationship, the first nail box housing 11 is omitted; the second nail box housing 12 is shown as an example. Figure 6 As shown, in the initial state, the cutter 63 is located on the proximal side of the nail head and on the distal side of the first fixing part 21 and the third fixing part 31. The distal sides of the first fixing part 21 and the third fixing part 31 are respectively provided with a first cutter groove 213 and a second cutter groove 312 (see...). Figure 4 The first cutting groove 213 and the second cutting groove 312 are both connected to the first channel 4, and in the initial state, the cutter 63 partially enters the first cutting groove and the second cutting groove. Figure 6As shown, the distance between the two outer side walls of the second fixing part 24 is greater than the distance between the two outer side walls of the first limiting part 23, that is, the width of the second fixing part 24 is greater than the width of the first limiting part 23. A first fixing groove 121 is provided at the distal end of the first nail cartridge housing 11 and the second nail cartridge housing 12. The second fixing part 24 and the first limiting part 23 at least partially enter the first fixing groove 121, and the second fixing part 24 is axially fixed to the first fixing groove 121. A first gap exists between the two outer side walls of the first limiting part 23 and the inner side wall of the first fixing groove 121 to allow for a certain deformation space for the first limiting part 23. The cooperation between the second connecting member 3 and the nail cartridge housing 1 is similar to the cooperation between the first connecting member 2 and the nail cartridge housing 1. The distance between the two outer side walls of the fourth fixing part 34 of the second connecting member 3 is greater than the distance between the two outer side walls of the second limiting part 33 (see...). Figure 4 That is, the width of the fourth fixing part 34 is greater than the width of the second limiting part 33. The fourth fixing part 34 and the second limiting part 33 at least partially enter the first fixing groove 121, and the fourth fixing part 34 is axially fixed to the first fixing groove 121. A first gap exists between the two outer sidewalls of the second limiting part 33 and the inner sidewall of the first fixing groove 121. Figure 3 and Figure 6 As shown, the nail head 6 and the nail cartridge housing 1 are also rotatably connected via a connecting rod 66. Specifically, as... Figure 3 As shown, the fixing sleeve 621 of the staple cartridge 62 is provided with a connecting post 623, such as... Figure 6 As shown, a through hole 661 is provided on the distal end of the connecting rod 66. The through hole 661 is sleeved on the connecting post 623 and can rotate relative to the connecting post 623. Figure 1 As shown, the proximal end of the connecting rod 66 is embedded in the nail cartridge housing 1 (there is a groove for accommodating the proximal end of the connecting rod 66 above the first nail cartridge housing 11 and below the second nail cartridge housing 12).

[0094] Figure 7 and Figure 8The diagram illustrates the mating structure of the first connector 2, the second connector 3, and the swing head pull rod 71 in this embodiment. In this embodiment, the first deformable part 22 has a third hole 221, and the second deformable part 32 has a fourth hole 321. The third hole 221 and the fourth hole 321 are vertically connected and are preferably located at the distal ends of the first deformable part 22 and the second deformable part 32, respectively. A second channel 26 is provided on one side of the first deformable part 22, and the second channel 26 extends axially. The drive mechanism also includes a swing head pull rod 71 and a pull rod pin 72 extending axially. The distal end of the swing head pull rod 71 enters the second channel 26, and the pull rod pin 72 passes through the third hole 221, the distal end of the swing head pull rod 71, and the fourth hole 321. When it is necessary to control the oscillation of the staple head 6 relative to the stapler body, by operating the oscillation lever 71 at the proximal end to move the oscillation lever along the axial direction of the stapler, the first deformation part 22 and the second deformation part 32 can be controlled to oscillate to one side to generate deformation. At the same time, the first fixing part 21 drives the staple head 6 to oscillate relative to the stapler body through the fixing sleeve 621 of the staple cartridge frame 62 and the connecting pin 65.

[0095] like Figures 9-13 The diagram shows a schematic representation of the connector and nail magazine housing 1 according to a second embodiment of the present invention. The difference between the second and first embodiments is that the length of the first deformable portion 22 in the second embodiment is greater than that in the first embodiment, and the length of the first limiting portion 23 in the second embodiment is shorter than that in the first embodiment. Correspondingly, the length of the second deformable portion 32 in the second embodiment is greater than that in the first embodiment, and the length of the second limiting portion 33 in the second embodiment is shorter than that in the first embodiment. Compared to the structure in the first embodiment, the structure of the second embodiment, by increasing the length of the deformable portion and decreasing the length of the limiting portion, improves the overall structural strength of the first connector 2 and the second connector 3, and provides better restraint on the bending deformation of the firing rod 5. Correspondingly, due to the increased length of the deformable portion, part of the deformable portion also enters the interior of the nail magazine housing 1. Specifically, a second fixing groove 122 is further provided on the distal side of the first nail box shell 11 and the second nail box shell 12. The first deformable part 22 at least partially enters the second fixing groove 122, and the width of the second fixing groove 122 is greater than the width of the first fixing groove 121 (e.g., ...). Figure 10 and Figure 11As shown in the diagram, a third gap exists between the two outer sidewalls of the first deformable portion 22 and the inner sidewall of the second fixing groove 122, thereby providing a certain deformation space for the first deformable portion 22. The mating structure between the second connecting member 3 and the nail box housing 1 is similar to the mating structure between the first connecting member 2 and the nail box housing 1. The second deformable portion 32 at least partially enters the second fixing groove 122, and a third gap exists between the two outer sidewalls of the second deformable portion 32 and the inner sidewall of the second fixing groove 122, thereby providing sufficient deformation space for the second deformable portion 32. In this embodiment, the first groove 222 of the first deformable portion 22 is a strip-shaped groove extending in the transverse direction. Figure 12 and Figure 13 As shown, a mating groove 231 is formed in the inner wall of the proximal side of the first deformable part 22 and the inner wall of the first limiting part 23. A reinforcing member 331 is provided on the inner side of the proximal side of the second deformable part 32 and the inner side of the second limiting part 33. The reinforcing member 331 enters the mating groove 231 to simultaneously improve the structural strength of the proximal side of the first deformable part 22 and the first limiting part 23, providing better deformation limiting for the firing rod 5. The structures of other parts of the connector and other components in the stapler in this second embodiment can be the same as or different from those in the first embodiment.

[0096] like Figure 10 and Figure 11 As shown, the second fixing part 24 and the fourth fixing part 34 are fixedly disposed in the first fixing groove 121 and are axially fixed to the first fixing groove 121. When the firing rod 5 moves or swings axially, the second fixing part 24 and the fourth fixing part 34 will not have axial displacement. Specifically, the first fixing groove 121 includes a distal end and a proximal end. The distal end of the first fixing groove 121 at least partially accommodates the first limiting part 23, and the proximal end of the first fixing groove 121 accommodates the second fixing part 24 and the fourth fixing part 34. A first stepped surface 1211 is provided between the distal end and the proximal end of the first fixing groove 121. The distal ends of the second fixing part 24 and the fourth fixing part 34 abut against the first stepped surface 1211. A second stepped surface 1212 is provided at the proximal end of the first fixing groove 121. The proximal ends of the second fixing part 24 and the fourth fixing part 34 abut against the second stepped surface 1212, thereby holding the second fixing part 24 and the fourth fixing part 34 between the first stepped surface 1211 and the second stepped surface 1212, thus achieving axial fixation of the first fixing part 24 and the fourth fixing part 34 relative to the nail box housing 1. Figure 10 and Figure 11 The mating structure of the second fixing part 24 and the fourth fixing part 34 shown in the figure with the second nail box housing 12 can also be applied to the first embodiment described above.

[0097] Figure 14 and Figure 15 This is a schematic diagram of the connector according to the third embodiment of the present invention. The difference between the third embodiment and the second embodiment is only that: the sidewalls of the first deformable part 22 and the first limiting part 23 are further provided with inserts, which further strengthen the structural strength of the first deformable part 22 and the first limiting part 23, providing better deformation limiting for the firing lever 5. The insert can be used as follows: Figure 15 The image shows a continuous insert extending along the axial direction, or it could be a segmented insert, fitted into the sidewall of the first deformable portion 22 and the outer sidewall of the first limiting portion. In another alternative embodiment, the insert may be provided only on the outer sidewall of the first limiting portion, or only on a portion of the sidewall of the first deformable portion 22.

[0098] Figures 1-15 In the embodiments shown, the connectors are all divided into a first connector 2 and a second connector 3, and the nail cartridge housing 1 includes a first nail cartridge housing 11 and a second nail cartridge housing 12. In some alternative embodiments, the connectors can also be a single integral structure, for example, using only the structure of the first connector, with the height of the first connector increased to adapt it to the dimensions of the nail cartridge rack and the nail cartridge housing. The nail cartridge housing can also be a single, integral structure, i.e., including a cylindrical rod-like structure. Figures 1-15 The diagram exemplarily illustrates the structure of a first groove formed on a first deformable portion and a second groove formed on a second deformable portion. In other alternative embodiments, the first and second grooves may adopt other shapes and distributions. When the deformability of the first and second deformable portions meets the requirements, the first and second grooves may not be formed. Figures 1-15 The shown method of mating between the connector, the nail head, and the nail cartridge housing is not unique. Other alternative mating and connection methods can also be used in other alternative embodiments, all of which fall within the scope of protection of this invention. In the above embodiments, the second connector and the first connector are made of at least partially deformable materials, or they can be made of a single material, such as medical-grade plastics like polyvinyl chloride (PVC), polyethylene (PE), or polypropylene (PP). A lubrication structure can be further provided between the first connector and the second connector. This lubrication structure can 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.

[0099] 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 first connector includes a first fixing part, a first mating part, and a second fixing part arranged sequentially from the distal end to the proximal end. The first connector defines an axially extending first channel, through which the firing rod passes. The first fixing part is connected to the proximal end of the nail head, and the second fixing part is connected to the nail cartridge housing. The first mating part includes a first deformable part and a first limiting part, with the first limiting part connected between the first deformable part and the second fixing part. When the staple head swings axially relative to the stapler body, the firing rod swings with the staple head, and the first deformation portion deforms at least partially with the swing of the staple head. The first limiting portion deforms, and the deformation of the first limiting portion is less than the deformation of the first deformation portion.

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 mating part undergoes compressive deformation on the first side and at least part of the second side of the first mating part undergoes tensile deformation. When the staple head swings axially toward the second side relative to the stapler body, at least part of the first mating part undergoes tensile deformation, and at least part of the second mating part undergoes compressive deformation.

3. The driving mechanism according to claim 1, characterized in that, The first deformed part has multiple first grooves.

4. The driving mechanism according to claim 3, characterized in that, The first groove is an arc groove that radiates outward from the central axis of the first deformed part, or the first groove extends in the lateral direction.

5. The driving mechanism according to claim 1, characterized in that, The distance between the two outer walls of the first limiting part is less than the distance between the two outer walls of the first deformable part.

6. The driving mechanism according to claim 5, characterized in that, The distance between the two outer side walls of the second fixing part is greater than the distance between the two outer side walls of the first limiting part; a first fixing groove is provided on the far end side of the nail box shell, and the second fixing part is fixedly disposed in the first fixing groove.

7. The driving mechanism according to claim 6, characterized in that, The first fixing groove includes a distal end and a proximal end, the distal end of the first fixing groove at least partially accommodates the first defining portion, and there is a first gap between the two outer sidewalls of the first defining portion and the inner sidewall of the first fixing groove. The proximal end of the first fixing groove accommodates the second fixing part. A first stepped surface is provided between the distal end and the proximal end of the first fixing groove. A second stepped surface is provided at the proximal end of the first fixing groove. The distal end of the second fixing part abuts against the first stepped surface, and the proximal end of the second fixing part abuts against the second stepped surface.

8. The driving mechanism according to claim 6, characterized in that, The distal end of the nail box shell is provided with a second fixing groove, the first deformable part at least partially enters 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 third gap between the two outer side walls of the first deformable part and the inner side wall of the second fixing groove.

9. The driving mechanism according to claim 1, characterized in that, The sidewall of the first deformable part and / or the sidewall of the first limiting part are further provided with inserts.

10. The driving mechanism according to claim 1, characterized in that, It also includes a second connector, which includes a third fixing part, a second mating part, and a fourth fixing part arranged sequentially from the distal end to the proximal end. The third fixing part, the second mating part, and the fourth fixing part are respectively connected to the first fixing part, the first mating part, and the second fixing part. The second connector and the first connector together define the first channel. When the staple head swings axially relative to the stapler body, the second mating part deforms at least partially with the swing of the staple head.

11. The driving mechanism according to claim 10, characterized in that, The first fixing part is provided with a first hole, and the third fixing part is provided with a first fixing post embedded in the first hole; or, the third fixing part is provided with a first hole, and the first fixing part is provided with a first fixing post embedded in the first hole. The second fixing part is provided with a second hole, and the fourth fixing part is provided with a second fixing post embedded in the second hole; or, the fourth fixing part is provided with a second hole, the second fixing part is provided with a second fixing post embedded in the second hole, and the second connecting member is axially fixedly connected to the first connecting member.

12. The driving mechanism according to claim 11, characterized in that, The first fixing post is a rectangular fixing post extending in the lateral direction, and the second fixing post is a rectangular fixing post extending in the axial direction.

13. The driving mechanism according to claim 10, characterized in that, The second mating part includes a second deformable part and a second limiting part, the second deformable part and the second limiting part being respectively connected to the first deformable part and the first limiting part; the distance between the two outer side walls of the second limiting part is less than the distance between the two outer side walls of the second deformable part.

14. The driving mechanism according to claim 13, characterized in that, The first deformable part has a third hole, the second deformable part has a fourth hole, the third hole and the fourth hole are connected vertically, and a second channel extending axially is provided on one side of the first connector. The drive mechanism also includes a swing head rod and a tie pin. The distal end of the swing head rod enters the second channel, and the tie pin passes through the third hole, the distal end of the swing head rod, and the fourth hole.

15. The driving mechanism according to claim 10, characterized in that, The first connector is located on the side of the second connector away from the bottom surface of the nail head, and the height of the first connector is greater than the height of the second connector.

16. The driving mechanism according to claim 10, characterized in that, The inner wall of the first mating part is provided with a mating groove, and the inner side of the second mating part is provided with a reinforcing member extending along the axial direction, the reinforcing member being embedded in the mating groove.

17. The driving mechanism according to claim 10, characterized in that, A cutter is provided on the proximal side of the nail head, and a first cutter groove and a second cutter groove are provided on the distal side of the first fixing part and the third fixing part, respectively. The first cutter groove and the second cutter groove are both connected to the first channel, and in the initial state, the cutter part enters the first cutter groove and the second cutter groove.

18. The driving mechanism according to claim 10, characterized in that, A lubrication structure is provided between the first connector and the second connector.

19. The driving mechanism according to claim 1, characterized in that, The nail head includes a nail cartridge holder, and the distal end of the first fixing part of the first connector is connected to the proximal end of the nail cartridge holder by a connecting pin.

20. The driving mechanism according to claim 19, characterized in that, A fixing sleeve is provided on the proximal side of the staple cartridge, and the first fixing part at least partially enters the interior of the fixing sleeve.

21. A medical stapler, characterized in that, Includes the drive mechanism according to any one of claims 1 to 20.

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