Driving mechanism and medical stapler

Abstract

The present invention provides a driving mechanism and a medical stapler, the medical stapler comprising a body and a nail head located at the distal side of the body; the driving mechanism comprising a pushing member and at least one stopper assembly, the stopper assembly being arranged at one side of the pushing member; the stopper assembly comprising a first stopper sheet and a second stopper sheet, the proximal side of the first stopper sheet being connected to the body, the distal side of the first stopper sheet being rotatably connected to the proximal side of the second stopper sheet, and the distal side of the second stopper sheet being connected to the nail head. By adopting the present invention, when the nail head swings in the axial direction relative to the body, the pushing member swings with the nail head, and the nail head drives the second stopper sheet to rotate relative to the first stopper sheet, thereby effectively limiting the deformation of the pushing member during the swinging process.

Description

Technical Field

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

[0002] Digestive tract diseases are one of the most common diseases in humans. During the treatment process, medical staplers are often used to replace the doctor's manual operation to anastomose the digestive tract and other physiological tissues. Medical staplers are a common surgical instrument, most of which use axial internal stapling to form end-to-end or end-to-side anastomosis of physiological tissues such as the esophagus, stomach, and intestines during surgery.

[0003] A linear stapler generally includes a body and a nail head. A nail magazine shell is disposed on the distal side of the body, the nail head is mounted on the distal side of the nail magazine shell, a pusher extending along the axial direction of the nail magazine shell is disposed inside the nail magazine shell, and the distal side of the pusher extends into the nail head. When firing the stapler, the pusher is driven to move toward the distal side of the stapler by operating an operating handle disposed on the body, and the nail head can cut and suture tissues under the drive of the pusher.

[0004] In the prior art, in order to achieve more operating angles, the nail head can be set to swing relative to the nail magazine housing, and the nail head will drive the pusher to swing together when it swings, so the pusher will bend to a certain extent. The existing pusher is generally formed by stacking multiple push blades. When the pusher is bent, the stacked push blades will open outward at the bent part, causing the pusher to deform greatly, making the firing force larger, which is easy to cause surgery failure.

[0005] In the present 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 site is the distal side. Summary of the invention

[0006] 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, which can effectively limit the deformation of the pushing member by limiting the action of the anti-expansion component on the pushing member.

[0007] An embodiment of the present invention provides a medical stapler for use in a medical stapler, the medical stapler comprising a body and a staple head located at a distal end of the body; the driving mechanism comprises:

[0008] A pusher, the proximal end side of which is located in the body, and the pusher extends into the nail head along the axial direction of the body;

[0009] At least one expansion-stopping assembly is arranged on one side of the pushing member, the expansion-stopping assembly comprises a first expansion-stopping sheet and a second expansion-stopping sheet, the proximal end side of the first expansion-stopping sheet is connected to the body, the distal end side of the first expansion-stopping sheet is rotatably connected to the proximal end side of the second expansion-stopping sheet, and the distal end side of the second expansion-stopping sheet is connected to the nail head;

[0010] When the nail head swings relative to the axial direction of the body, the pushing member swings along with the nail head, and the nail head drives the second expansion-stopping piece to rotate relative to the first expansion-stopping piece.

[0011] Optionally, when the nail head extends along the axial direction of the body, both the first expansion-stopping piece and the second expansion-stopping piece extend along the axial direction of the body.

[0012] Optionally, one of the anti-expansion components is respectively provided on both sides of the pushing member.

[0013] Optionally, the nail head can swing along the first radial direction of the body, the pushing member includes a plurality of push blades, the plurality of push blades are stacked in sequence along the first radial direction of the body, and the anti-expansion assembly is arranged on the outside of the outermost push blade.

[0014] Optionally, the anti-expansion assembly further includes a connecting pin, and the second anti-expansion piece is rotatably connected to the first anti-expansion piece via the connecting pin.

[0015] Optionally, the nail head can swing along a first radial direction of the body, and the connecting pin extends along a second radial direction of the body, and the first radial direction is perpendicular to the second radial direction.

[0016] Optionally, a first bending portion is provided on the distal side of the first anti-expansion piece, and a second bending portion is provided on the proximal side of the second anti-expansion piece, and the interiors of the first bending portion and the second bending portion together constitute an accommodating space for accommodating the connecting pin; when the nail head swings relative to the axial direction of the main body, the volume of the accommodating space changes.

[0017] Optionally, the first bending portion is provided with at least one first hollow portion, the second bending portion is provided with at least one second hollow portion, and the first hollow portion and the second hollow portion are staggered so that the first bending portion and the second bending portion intersect to form the accommodating space.

[0018] Optionally, the first anti-expansion sheet includes a first connecting portion located between a proximal side and a distal side of the first anti-expansion sheet, and the first hollow portion extends from the first connecting portion to the first bending portion.

[0019] Optionally, the second anti-expansion sheet includes a second connecting portion located between a proximal side and a distal side of the second anti-expansion sheet, and the second hollow portion extends from the second connecting portion to the second bending portion.

[0020] Optionally, when the nail head extends along the axial direction of the body, the length of the accommodating space along the axial direction of the body is greater than the length of the connecting pin along the axial direction of the body.

[0021] Optionally, when the nail head swings relative to the axial direction of the body, the length of the accommodating space along the axial direction of the body changes.

[0022] Optionally, the first expansion-stopping sheet includes a first connecting portion located between a proximal side and a distal side of the first expansion-stopping sheet, a first stopping portion is provided at a terminal end of the first bending portion, and the first stopping portion is bent toward the first connecting portion.

[0023] Optionally, the second anti-expansion sheet includes a second connecting portion located between the proximal side and the distal side of the second anti-expansion sheet, and a second stopping portion is provided at the end of the second bending portion, and the second stopping portion is bent toward the second connecting portion.

[0024] Optionally, a nail magazine shell is provided on the proximal side of the main body, and the proximal side of the first anti-expansion sheet is fixed to the inner wall of the nail magazine shell.

[0025] Optionally, a connecting piece is provided on the proximal side of the nail head, and a distal side of the second anti-expansion sheet is fixed to the connecting piece.

[0026] An embodiment of the present invention further provides a medical stapler, comprising the above-mentioned driving mechanism.

[0027] The driving mechanism and medical stapler provided by the present invention have the following advantages:

[0028] The present invention provides a driving mechanism for a medical stapler, through the limiting and retaining effect of the anti-expansion component on the pusher, when the nail head swings relative to the body, when the pusher bends with the swing of the nail head, the anti-expansion component is also driven by the nail head to bend in the same direction, and the pusher is restricted by the anti-expansion component and will not produce excessive deformation, thereby effectively limiting the deformation of the pusher. Furthermore, in the case where the pusher is composed of multiple push blades stacked together, due to the limiting and retaining effect of the anti-expansion component, when the pusher bends, the multiple push blades will not open outward, thereby improving the surgical effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Other features, objectives and advantages of the present invention will become more apparent from a reading of the detailed description of non-limiting embodiments made with reference to the following accompanying drawings.

[0030] Figure 1 It is a schematic structural diagram of the cooperation between the nail magazine housing and the connecting piece according to an embodiment of the present invention;

[0031] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0032] Figure 3 It is a schematic structural diagram of a push blade according to an embodiment of the present invention;

[0033] Figure 4 It is a three-dimensional diagram of the cooperation between the driving mechanism, the nail magazine housing and the connecting piece according to one embodiment of the present invention;

[0034] Figure 5 It is a front view of the driving mechanism of one embodiment of the present invention cooperating with the nail magazine housing and the connecting piece;

[0035] Figure 6 It is a front view of the expansion-stopping assembly in accordance with an embodiment of the present invention in cooperation with the nail magazine housing and the connecting piece;

[0036] Figure 7 is a schematic structural diagram of a driving mechanism according to an embodiment of the present invention;

[0037] Figure 8 It is a three-dimensional diagram of a driving mechanism provided with two anti-swelling components cooperating with a nail magazine housing and a connecting piece according to an embodiment of the present invention;

[0038] Fig. 9 It is a front view of a driving mechanism with two anti-swelling components cooperating with a nail magazine housing and a connecting piece according to an embodiment of the present invention;

[0039] Fig.10 It is a structural schematic diagram of a driving mechanism provided with two anti-swelling components according to an embodiment of the present invention;

[0040] Fig.11 and Fig.12 is a three-dimensional diagram of an anti-swelling assembly according to an embodiment of the present invention;

[0041] Fig.13 is an exploded view of an anti-swelling assembly according to an embodiment of the present invention;

[0042] Fig.14 is a front view of an anti-swelling assembly according to an embodiment of the present invention;

[0043] Fig.15 and Fig.16 is a schematic diagram of two alternative modes of the anti-swelling assembly of the present invention;

[0044] Fig.17 and Fig.18is a schematic diagram of the changing state of the driving mechanism of one embodiment of the present invention;

[0045] Fig.19 and Fig. 20 It is a schematic diagram of the changing states of a driving mechanism provided with two anti-swelling components according to an embodiment of the present invention.

[0046] Reference numerals:

[0047] 1 Nail magazine housing 44 first hollow portion

[0048] 11 first card slot 45 first connection portion

[0049] 2 Connector 5 Second expansion plate

[0050] 21 second slot 51 second bending portion

[0051] 3 Pushing rod 52 Fourth bending portion

[0052] 31 Distal end side of the push rod 53 Second stopper

[0053] 32 push blade 54 second hollow part

[0054] 4 First anti-expansion piece 55 Second connecting part

[0055] 41 first bending portion 6 connecting pin

[0056] 42 Third bending portion 7 Accommodating space

[0057] 43 first stopper DETAILED DESCRIPTION

[0058] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their repeated description will be omitted.

[0059] In order to solve the technical problems in the prior art, the present invention provides a driving assembly and a medical stapler including the same. The stapler includes a body and a nail head located at the distal side of the body; the driving mechanism includes a pushing member and at least one anti-expansion assembly, the pushing member extends from the body to the nail head along the axial direction of the body, and the anti-expansion assembly is used to limit the bending deformation of the pushing member. Specifically, the anti-expansion assembly is arranged on one side of the pushing member, and the anti-expansion assembly includes a first anti-expansion sheet and a second anti-expansion sheet, the proximal side of the first anti-expansion sheet is connected to the body, the distal side of the first anti-expansion sheet is rotatably connected to the proximal side of the second anti-expansion sheet, and the distal side of the second anti-expansion sheet is connected to the nail head.

[0060] When the nail head is in an initial state, the nail head extends along the axial direction of the main body. When the nail head swings along the radial direction of the main body relative to the axial direction of the main body, the pushing member swings along with the nail head, causing the pushing member to bend. At the same time, the nail head drives the second anti-expansion plate to rotate relative to the first anti-expansion plate, and the anti-expansion assembly also produces a bending deformation in the same bending direction as the pushing member to limit the deformation of the pushing member and avoid excessive deformation of the pushing member, thereby improving the surgical effect.

[0061] Combine the following Figures 1 to 18 The structure of the driving mechanism in a specific embodiment is described in detail. It is understood that this embodiment is only an example and is not intended to limit the scope of protection of the present invention.

[0062] like Figures 1 to 4 As shown in FIG. 1 , in this embodiment, the stapler comprises a body and a staple head. A stapler housing 1 is mounted on the distal end of the body, and a connector 2 is fixed on the proximal end of the staple head. Figure 1 and Figure 2 In the figure, the lower half of the nail magazine housing 1 is omitted. Figure 4 In, relative to Figure 1 and Figure 2 , further eliminating a portion of the nail magazine housing 1. The driving mechanism includes a pusher and an anti-expansion assembly for limiting the deformation of the pusher. In this embodiment, the pusher is a pusher rod 3 for driving the nail head to perform suturing and cutting actions. The proximal end of the pusher rod 3 is located in the body, and the pusher rod 3 extends into the nail head along the axial direction of the body. Figure 3 and Figure 4As shown, in this embodiment, the pusher rod 3 is composed of a plurality of pusher blades 32 stacked in sequence along the first radial direction of the stapler, but the present invention is not limited to this. In other alternative embodiments, the pusher rod 3 may also be an integrally formed part, or adopt other structures, all of which fall within the scope of protection of the present invention.

[0063] In the present 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 site is the distal side. Figure 5 and Figure 6 In the perspective of , along the axial direction S1 of the nail magazine housing 1, the left side is the proximal side, and the right side is the distal side, that is, the right side of the pusher rod 3 is the distal side 31 of the pusher rod 3, the left side of the first expansion stop sheet 4 is the proximal side provided with the third bending portion 42, and the right side is the distal side provided with the first bending portion 41, the left side of the second expansion stop sheet 5 is the proximal side provided with the second bending portion 51, and the right side is the distal side provided with the fourth bending portion 52. In the present invention, the inner side and the outer side are relative to the axis of the main body of the stapler, the side close to the axis is the inner side, and the side away from the axis is the outer side.

[0064] like Figures 4 to 7 As shown, the anti-expansion assembly includes a first anti-expansion piece 4 and a second anti-expansion piece 5, the proximal side of the first anti-expansion piece 4 is connected to the nail magazine shell 1 of the main body, the distal side of the first anti-expansion piece 4 is rotatably connected to the proximal side of the second anti-expansion piece 5, and the distal side of the second anti-expansion piece 5 is connected to the connecting piece 2 of the nail head.

[0065] The axial direction of the stapler body, i.e., the axial direction of the stapler housing 1, is Figure 5 In order to increase the optional surgical operation angles, the nail head can swing relative to the axial direction of the body. Specifically, the nail head can swing along the first radial direction of the body. Figure 5 As shown, the first radial direction includes an upward direction in the S2 direction and a downward direction in the S3 direction, and the nail head can swing upward along the first radial direction (along the S2 direction) and swing downward along the first radial direction (along the S3 direction). In other alternative embodiments, the nail head can also be set to be able to swing only along the S2 direction, or set to be able to swing only along the S3 direction, etc.

[0066] When the nail head is in the initial state, the nail head extends along the axial direction of the body, and at this time, the pusher rod 3 also extends along the axial direction of the body. The extension direction of the first anti-expansion sheet 4 and the second anti-expansion sheet 5 is preferably substantially consistent with the extension direction of the pusher rod 3 to maintain the initial state of the pusher rod 3. At this time, the first anti-expansion sheet 4 and the second anti-expansion sheet 5 substantially extend along the axial direction of the body.

[0067] When the nail head swings along the first radial direction of the body relative to the axial direction of the body, the pusher rod 3 is bent. For example, in the initial state, the pusher rod 3 is also in the initial state, and the initial state refers to the state in which the stapler is not fired, that is, the pusher rod 3 does not move toward the distal side. When the nail head swings along the S2 direction, the distal side 31 of the pusher rod 3 is bent upward relative to the proximal side, and when the nail head swings along the S3 direction, the distal side 31 of the pusher rod 3 is bent downward relative to the proximal side. At the same time, the nail head drives the second anti-expansion sheet 5 to rotate relative to the first anti-expansion sheet 4 through the connecting member 2, so that the anti-expansion assembly also produces a bending deformation in the same bending direction as the pushing member. After the pusher rod 3 is bent, the anti-expansion assembly can still keep basically fitting the side of the pusher rod 3 to limit the deformation of the pusher rod 3 and avoid excessive deformation of the pusher rod 3. For example, when the nail head swings in the direction S2, the second anti-expansion piece 5 rotates upward relative to the first anti-expansion piece 4, and when the nail head swings in the direction S3, the second anti-expansion piece 5 rotates downward relative to the first anti-expansion piece 4. In this embodiment, since the knife pusher rod 3 is formed by stacking a plurality of nail pusher pieces 32, the anti-expansion assembly can be kept in a state where the nail pusher pieces 32 will not open toward the side where the anti-expansion assembly is located when the knife pusher rod 3 is bent.

[0068] like Figure 5 and Figure 6As shown, the inner wall of the nail magazine shell 1 is provided with a first slot 11, and the proximal side of the first expansion-stopping piece 4 is formed with a third bending portion 42, and the third bending portion 42 is inserted into the first slot 11 to connect the first expansion-stopping piece 4 and the nail magazine shell 1. The connecting member 2 is provided with a second slot 21, and the distal side of the second expansion-stopping piece 5 is formed with a fourth bending portion 52, and the fourth bending portion 52 is inserted into the second slot 21 to connect the second expansion-stopping piece 5 and the connecting member 2. Here, only one fixing method of the expansion-stopping assembly with the body and the nail head is shown. In other alternative embodiments, the connection between the first expansion-stopping piece 4 and the nail magazine shell 1 can also be adopted in other ways, such as bolts, pins, etc., and the connection between the second expansion-stopping piece 5 and the connecting member 2 can also be adopted in other ways, such as bolts, pins, etc. In other alternative embodiments, the first expansion-stopping piece 4 can also be connected to other parts of the body, and the second expansion-stopping piece 5 can also be connected to other parts of the nail head, etc., all of which belong to the protection scope of the present invention. In a preferred embodiment, the third bending portion 42 is inserted into the first clamping slot 11 for fixed connection, and the fourth bending portion 52 is inserted into the second clamping slot 21 for fixed connection.

[0069] like Figures 8 to 10 As shown, in order to further enhance the limiting and retaining effect on the pusher rod 3, an anti-expansion assembly is provided on both sides of the pusher rod 3. The two anti-expansion assemblies are respectively provided on the outsides of the two outermost push blades 32 of the pusher rod 3. When the pusher rod 3 bends with the swinging action of the nail head, anti-expansion assemblies with the same bending deformation are provided on both sides of the pusher rod 32 to limit the deformation of both sides of the pusher rod 32. In the embodiment where the pusher rod 3 includes a plurality of stacked push blades 32, the two anti-expansion assemblies can respectively limit the push blades 32 on both sides of the pusher rod 32 from opening.

[0070] like Figures 11 to 14 , shows the structure of an anti-expansion assembly in this embodiment. In this embodiment, the anti-expansion assembly further includes a connecting pin 6, through which the first anti-expansion sheet 4 is rotatably connected to the second anti-expansion sheet 5. Specifically, the first anti-expansion sheet 4 may be fixed to the connecting pin 6, and the second anti-expansion sheet 5 may be rotatably connected to the connecting pin 6, or the first anti-expansion sheet 4 may be rotatably connected to the connecting pin 6, and the second anti-expansion sheet 5 may be fixed to the connecting pin 6, or both the first anti-expansion sheet 4 and the second anti-expansion sheet 5 may be rotatably connected to the connecting pin 6.

[0071] In this embodiment, the distal end of the first anti-expansion sheet 4 is provided with a first bent portion 41, and the proximal end of the second anti-expansion sheet 5 is provided with a second bent portion 51. The interiors of the first bent portion 41 and the second bent portion 51 together form a receiving space 7 for receiving the connecting pin 6. When the nail head swings relative to the axial direction of the body, the volume of the receiving space 7 will change accordingly. In other alternative embodiments, the first anti-expansion sheet 4 and the second anti-expansion sheet 5 can also be connected to the connecting pin 6 in other ways, for example, a pin hole is provided in the first anti-expansion sheet 4, or a pin hole is provided in the second anti-expansion sheet 5, etc.

[0072] like Fig.13 As shown, the connecting pin 6 preferably extends along the second radial direction S4 of the body, and the first radial direction and the second radial direction S4 are perpendicular. However, the present invention is not limited thereto. In other alternative embodiments, the connecting pin 6 may also extend along other directions. In this embodiment, the connecting pin 6 is a cylindrical pin. In other alternative embodiments, the connecting pin 6 may also be a connecting pin, an elliptical pin, a flat cylindrical pin, etc. with a rectangular cross section. When the connecting pin 6 is a flat cylindrical pin, the flat cylindrical pin may extend along the axial direction S1 of the body, and the proximal end face and the distal end face of the flat cylindrical pin are adapted to the shape of the accommodating space.

[0073] like Fig.11 As shown, in this embodiment, the first bending portion 41 is provided with at least one first hollow portion 44, the second bending portion 51 is provided with at least one second hollow portion 54, and the first hollow portion 44 and the second hollow portion 54 are arranged alternately, so that the first bending portion 41 and the second bending portion 51 intersect to form the accommodating space 7. By adopting a structural arrangement, the first bending portion 41 and the second bending portion 51 are respectively equivalent to a claw-shaped structure, which alternately surrounds the connecting pin 6, so that a relatively stable connection relationship between the first anti-expansion sheet 4 and the second anti-expansion sheet 5 and the connecting pin 6 can be achieved.

[0074] like Fig.15 In an alternative embodiment shown in the figure, the first bending portion 41' and the second bending portion 51' may be both solid structures that do not include a hollow structure. The anti-expansion assembly includes a first anti-expansion plate 4', a second anti-expansion plate 5' and a connecting pin 6'. The first bending portion surrounds the front section of the connecting pin 6, and the second bending portion 41' surrounds the rear section of the connecting pin 6, that is, the first bending portion 41' and the second bending portion 51' do not intersect, but respectively surround different parts of the connecting pin 6. Similarly, it is also possible that the first bending portion surrounds the rear section of the connecting pin 6', and the second bending portion surrounds the front section of the connecting pin 6. Here, the front section and the rear section of the connecting pin 6' are divided along the axial direction S4 of the connecting pin 6.

[0075] like Fig.16 In an alternative embodiment shown in the figure, the first bending portion 41" and the second bending portion 51" may be both solid structures that do not include a hollow structure. The anti-expansion assembly includes a first anti-expansion sheet 4", a second anti-expansion sheet 5" and a connecting pin 6". In an initial state, the first anti-expansion sheet 4" is located above the connecting pin 6, and the second anti-expansion sheet 5" is located below the connecting pin 6". The first bending portion 41" and the second bending portion 51" surround the connecting pin 6" from the upper and lower directions respectively.

[0076] When the first bending portion and the second bending portion are configured as a solid structure, compared with the first bending portion and the second bending portion using a hollow structure, the first bending portion and the second bending portion can be better prevented from being deformed when the nail head swings.

[0077] like Fig.13 As shown, the first expansion-stopping sheet 4 includes a first connection portion 45 located between the proximal side and the distal side of the first expansion-stopping sheet 4, and the first hollow portion 44 extends from the first connection portion 45 to the first bending portion 41. In the initial state, that is, when the nail head does not swing, the first hollow portion 44 in the first connection portion 45 preferably extends along the axial direction S1 of the body, but the present invention is not limited thereto. The second expansion-stopping sheet 5 includes a second connection portion 55 located between the proximal side and the distal side of the second expansion-stopping sheet 5, and the second hollow portion 54 extends from the second connection portion 55 to the second bending portion 51. In the initial state, that is, when the nail head does not swing, the second hollow portion 54 in the second connection portion 55 preferably extends along the axial direction S1 of the body, but the present invention is not limited thereto.

[0078] like Fig.12 and Fig.13 As shown, in order to further improve the stability of the connecting pin 6 in the accommodating space 7 and prevent the connecting pin 6 from falling out from the proximal side or the distal side of the accommodating space 7, a first stopper 43 is provided at the end of the first bent portion 41, and the first stopper 43 is bent toward the first connecting portion 45 to partially close the proximal side of the accommodating space 7, and a second stopper 53 is provided at the end of the second bent portion 51, and the second stopper 53 is bent toward the second connecting portion 55 to partially close the distal side of the accommodating space 7. Preferably, the first stopper 43 and the second stopper 53 are not hollow structures to increase strength.

[0079] The accommodating space 7 is preferably a retractable space. When the nail head extends along the axial direction of the body, the length of the accommodating space 7 along the axial direction of the body is greater than the length of the connecting pin along the axial direction of the body. At this time, the difference between the length of the accommodating space 7 along the axial direction of the body and the length of the connecting pin along the axial direction of the body is preferably 0.8mm to 5mm, but the present invention is not limited thereto. In other alternative embodiments, other values ​​outside this range may also be used. When the nail head swings relative to the axial direction of the body, the length of the accommodating space 7 along the axial direction of the body changes.

[0080] like Fig.17 and Fig.18 The diagrams respectively illustrate the changing states of the drive mechanism when the nail head swings along the S3 direction and the S2 direction. Fig.19 and Fig. 20 As shown, it further shows that when the expansion-stopping assembly is provided on both sides of the pusher rod 3, the changing state of the driving mechanism when the nail head swings along the direction S3 and along the direction S2. Figures 17-20 It can be seen that during the swinging of the nail head, the rotation of the second anti-expansion piece 5 causes the anti-expansion assembly to deform in the same direction as the bending direction of the pusher rod 3, so that the anti-expansion assembly remains basically attached to the side of the pusher rod 3, limiting the deformation of the pusher rod 3 and preventing the pusher rod 3 from deforming too much. During the deformation of the anti-expansion assembly, the volume of the accommodating space 7 can change with the change of the bending angle of the anti-expansion assembly, which can avoid the first anti-expansion piece 4 and the second anti-expansion piece 5 and the connecting pin 6 from having a hard connection and causing rotation jamming, making the bending deformation of the anti-expansion assembly smoother.

[0081] The driving mechanism and medical stapler provided by the present invention have the following advantages:

[0082] The present invention provides a driving mechanism for a medical stapler, through the limiting and retaining effect of the anti-expansion component on the pusher, when the nail head swings relative to the body, when the pusher bends with the swing of the nail head, the anti-expansion component is also driven by the nail head to bend in the same direction, and the pusher is restricted by the anti-expansion component and will not produce excessive deformation, thereby effectively limiting the deformation of the pusher. Furthermore, in the case where the pusher is composed of multiple push blades stacked together, due to the limiting and retaining effect of the anti-expansion component, when the pusher bends, the multiple push blades will not open outward, thereby improving the surgical effect.

[0083] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A driving mechanism, characterized in that: Used for a medical stapler, the medical stapler comprises a body and a staple head located at the distal end side of the body; the driving mechanism comprises: A pusher, the proximal end side of which is located in the body, and the pusher extends into the nail head along the axial direction of the body; At least one expansion-stopping assembly is arranged on one side of the pushing member, the expansion-stopping assembly comprises a first expansion-stopping sheet and a second expansion-stopping sheet, the proximal end side of the first expansion-stopping sheet is connected to the body, the distal end side of the first expansion-stopping sheet is rotatably connected to the proximal end side of the second expansion-stopping sheet, and the distal end side of the second expansion-stopping sheet is connected to the nail head; When the nail head swings relative to the axial direction of the body, the pushing member swings along with the nail head, and the nail head drives the second expansion-stopping piece to rotate relative to the first expansion-stopping piece.

2. The driving mechanism according to claim 1, characterized in that: When the nail head extends along the axial direction of the body, both the first expansion-stopping piece and the second expansion-stopping piece extend along the axial direction of the body.

3. The driving mechanism according to claim 1, characterized in that: The anti-expansion components are respectively arranged on both sides of the pushing member.

4. The driving mechanism according to claim 1, characterized in that: The nail head can swing along the first radial direction of the body, the pushing member includes a plurality of pushing blades, the plurality of pushing blades are stacked in sequence along the first radial direction of the body, and the anti-expansion assembly is arranged on the outside of the outermost pushing blade.

5. The driving mechanism according to claim 1, characterized in that: The anti-expansion assembly further includes a connecting pin, and the second anti-expansion piece is rotatably connected to the first anti-expansion piece through the connecting pin.

6. The driving mechanism according to claim 5, characterized in that: The nail head can swing along a first radial direction of the body, and the connecting pin extends along a second radial direction of the body, wherein the first radial direction is perpendicular to the second radial direction.

7. The driving mechanism according to claim 5, characterized in that: A first bending portion is provided on the distal side of the first anti-expansion piece, and a second bending portion is provided on the proximal side of the second anti-expansion piece. The interiors of the first bending portion and the second bending portion together constitute an accommodating space for accommodating the connecting pin; when the nail head swings relative to the axial direction of the main body, the volume of the accommodating space changes.

8. The driving mechanism according to claim 7, characterized in that: The first bending portion is provided with at least one first hollow portion, the second bending portion is provided with at least one second hollow portion, and the first hollow portion and the second hollow portion are staggered so that the first bending portion and the second bending portion intersect to form the accommodating space.

9. The driving mechanism according to claim 8, characterized in that: The first anti-expansion sheet includes a first connecting portion located between a proximal end side and a distal end side of the first anti-expansion sheet, and the first hollow portion extends from the first connecting portion to the first bending portion; The second anti-expansion sheet includes a second connecting portion located between a proximal end side and a distal end side of the second anti-expansion sheet, and the second hollow portion extends from the second connecting portion to the second bending portion.

10. The driving mechanism according to claim 7, characterized in that: When the nail head extends along the axial direction of the body, the length of the accommodation space along the axial direction of the body is greater than the length of the connecting pin along the axial direction of the body; When the nail head swings relative to the axial direction of the body, the length of the accommodating space along the axial direction of the body changes.

11. The driving mechanism according to claim 7, characterized in that: The first expansion-stopping sheet comprises a first connecting portion located between the proximal end side and the distal end side of the first expansion-stopping sheet, a first stop portion is disposed at the end of the first bending portion, and the first stop portion is bent toward the first connecting portion; The second expansion-stopping piece includes a second connecting portion located between the proximal end and the distal end of the second expansion-stopping piece, and a second stopping portion is disposed at the end of the second bending portion, and the second stopping portion is bent toward the second connecting portion.

12. The driving mechanism according to claim 1, characterized in that: A nail magazine shell is disposed on the proximal side of the body, and the proximal side of the first anti-expansion sheet is fixed to the inner wall of the nail magazine shell; A connecting piece is arranged on the proximal end side of the nail head, and a distal end side of the second anti-expansion sheet is fixed to the connecting piece.

13. A medical stapler, characterized in that: The invention comprises the driving mechanism according to any one of claims 1 to 12.

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