CN216854748U

CN216854748U - Head swinging mechanism and medical stapler

Info

Publication number: CN216854748U
Application number: CN202122886951.1U
Authority: CN
Inventors: 丁水澄
Original assignee: Suzhou Tianchen International Medical Technology Co Ltd
Current assignee: Suzhou Tianchen International Medical Technology Co Ltd
Priority date: 2021-11-23
Filing date: 2021-11-23
Publication date: 2022-07-01
Anticipated expiration: 2031-11-23

Abstract

The utility model provides a head swinging mechanism and a medical anastomat, wherein the head swinging mechanism comprises: the gear set comprises a driving wheel and a driven wheel, and the driven wheel comprises a first matching part; the swing pull rod comprises a second matching part and a pull piece matching part, the pull piece matching part is connected to the swing pull piece, and the second matching part is matched with the first matching part so as to drive the pull piece matching part of the swing pull rod to move along the axial direction of the anastomat when the driven wheel rotates; the shell comprises a first inner surface and a second inner surface which are enclosed into an accommodating cavity; the fixing piece is fixedly arranged in the accommodating cavity and comprises a third surface and a fourth surface, at least part of the gear set is arranged between the fourth surface and the second inner surface of the shell, and the gear set can rotate relative to the fixing piece. The utility model can simply and conveniently realize the swing of the nail head of the anastomat relative to the anastomat body, and the gear set is fixed on the shell through the fixing piece, thereby being beneficial to keeping the structural stability of the head swinging mechanism.

Description

Head swinging mechanism and medical anastomat

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a head swinging mechanism and a medical anastomat.

Background

In the prior art, a medical stapler comprises a stapler body, a firing handle movably connected with the stapler body, and a nail anvil assembly matched with the stapler body. The anastomat body comprises a firing assembly and a nail bin assembly arranged on the far end side. In the operation process, two sections of tissues to be anastomosed are placed between the nail anvil of the nail anvil assembly and the nail bin of the nail bin assembly, the distance between the nail anvil and the nail bin is adjusted to gradually clamp the tissues, and then the percussion assembly is driven by the percussion handle to enable the anastomotic nails to be formed on the nail anvil, so that anastomotic connection of the two sections of tissues is completed.

In order to meet the requirements of more surgical scenes, the nail head can be selected at more angles relative to the anastomat body. Therefore, the head swinging mechanism can be arranged between the anastomat body and the nail head and comprises a head swinging pulling piece, the far end of the head swinging pulling piece is connected to the nail head, and when the head swinging pulling rod is driven to move along the axial direction of the anastomat, the far end side of the head swinging pulling rod drives the nail head to swing clockwise or anticlockwise relative to the anastomat body.

The structure of the existing head swinging mechanism is generally complex, and when the head swings, the head swinging mechanism is difficult to set a swinging angle, and in the using process, the nail head part can also have an uncontrollable swinging phenomenon, so that the swinging angle of the nail head part is uncontrollable, the nail head part of the anastomat cannot be accurately positioned, and the operation effect is influenced.

In the present invention, the distal side and the proximal side are relative to the operator, and the end closer to the operator is the proximal side, and the end farther from the operator, i.e., the end closer to the surgical site is the distal side. In the stapler, the inner side and the outer side are relative to the axis of the stapler, wherein the side close to the axis is the inner side, and the side far away from the axis is the outer side.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a head swinging mechanism and a medical anastomat, which can simply and conveniently realize the swinging of a nail head of the anastomat relative to an anastomat body, and a gear set is fixed on a shell through a fixing piece, so that the structural stability of the head swinging mechanism is favorably maintained.

The embodiment of the utility model provides a head swinging mechanism for a medical anastomat, which comprises:

the gear set comprises a driving wheel and a driven wheel, the driving wheel drives the driven wheel to rotate when rotating, and the driven wheel comprises a first matching part;

the swing pull rod comprises a second matching part and a pull piece matching part, the pull piece matching part is connected to the swing pull piece, and the second matching part is matched with the first matching part, so that when the driven wheel rotates, the pull piece matching part of the swing pull rod is driven to move along the axial direction of the anastomat;

the shell comprises a first inner surface and a second inner surface, and an accommodating cavity is enclosed between the first inner surface and the second inner surface;

the fixing piece is fixedly arranged in the accommodating cavity and comprises a third surface facing the first inner surface and a fourth surface facing the second inner surface, at least part of the gear set is arranged between the fourth surface and the second inner surface of the shell, and the gear set can rotate relative to the fixing piece.

In some embodiments, the swing rod is disposed between the third surface and the first inner surface of the housing, and the fixing member and the swing rod are fixed relative to the housing in the height direction.

In some embodiments, the fixing member includes a driving wheel support portion located between the driving wheel and the first inner surface of the housing, and a driven wheel support portion located between the driven wheel and the first inner surface of the housing.

In some embodiments, a first fixing portion is disposed on a side of the driving wheel supporting portion facing the driving wheel, a second fixing portion is disposed on a side of the driving wheel facing the fixing member, the first fixing portion and the second fixing portion form an embedded connection, and the driving wheel is rotatable relative to the first fixing portion.

In some embodiments, the housing further includes a second inner surface, the driver further includes an operating portion and a driver tooth portion, the operating portion is disposed on a side of the driver tooth portion facing the second inner surface of the housing, and the first fixing portion is disposed on a side of the driver tooth portion facing the first inner surface of the housing;

the driven wheel further comprises a driven wheel tooth part, the driven wheel tooth part is meshed with the driving wheel tooth part, and the first matching part is positioned on one side, facing the first inner surface, of the driven wheel tooth part;

the driving gear teeth and the driven gear teeth are located between the fourth surface and the second inner surface of the housing.

In some embodiments, the first fixing portion is a first fixing column disposed on the driving wheel supporting portion and protruding toward the driving wheel, the second fixing portion is a groove disposed on a side of the driving wheel facing the fixing member, the groove is disposed coaxially with the driving wheel, and the first fixing column at least partially enters the groove; or the like, or, alternatively,

the first fixing portion is a groove formed in one side, facing the driving wheel, of the driving wheel supporting portion, the second fixing portion is a first fixing column arranged on the driving wheel and protruding towards the fixing piece, the first fixing column and the driving wheel are coaxially arranged, and at least part of the first fixing column enters the groove.

In some embodiments, a third fixing portion is disposed on a side of the driving wheel supporting portion facing the first inner surface of the housing, a fourth fixing portion is disposed on the first inner surface of the housing, and the third fixing portion and the fourth fixing portion form an embedded connection; and/or the presence of a gas in the gas,

one side of the driven wheel supporting part, facing the first inner surface of the shell, is provided with a fifth fixing part, the first inner surface of the shell is provided with a sixth fixing part, and the fifth fixing part and the sixth fixing part form embedded connection.

In some embodiments, the third fixing portion is a second fixing column protruding toward the first inner surface of the housing, the fourth fixing portion is a first supporting seat disposed on the first inner surface of the housing, a first fitting hole is opened at the center of the first supporting seat, and the second fixing column at least partially enters the first fitting hole, or the third fixing portion includes the first fitting hole, the fourth fixing portion is a second fixing column disposed on the housing toward the driving wheel supporting portion, and the second fixing column at least partially enters the first fitting hole;

the fifth fixing portion is a third fixing column protruding towards the first inner surface of the shell, the sixth fixing portion is a second supporting seat arranged on the first inner surface of the shell, a second matching hole is formed in the center of the second supporting seat, at least part of the third fixing column enters the second matching hole, or the fifth fixing portion comprises the second matching hole, the sixth fixing portion is a third fixing column arranged on the shell and facing towards the driven wheel supporting portion, and at least part of the third fixing column enters the second matching hole.

In some embodiments, one side of the driving wheel supporting portion facing the first inner surface of the housing is provided with a yielding groove, a sleeve limiting portion is arranged at a position of the housing opposite to the yielding groove, and the yielding groove and the sleeve limiting portion enclose a first channel along the axial direction.

In some embodiments, the surface of the receding groove and the surface of the sleeve limiting part are both arc surfaces, and the first channel is a cylindrical channel.

In some embodiments, the gear set includes two driven wheels, the swing mechanism includes two swing pull rods and two swing pull pieces, when the driving wheel rotates, the driven wheels drive the two swing pull rods to move axially, and the moving directions of the two swing pull rods are opposite;

the fixing piece comprises two driven wheel supporting parts, and an axially extending second channel is formed between the two driven wheel supporting parts.

In some embodiments, the swing pull-tab matching portion is a protruding portion disposed on an inner side of the second matching portion, and a hole matched with the protruding portion is disposed on a proximal end side of the swing pull-tab, or the swing pull-tab matching portion is a groove disposed on the inner side of the second matching portion, and the protruding portion matched with the groove is disposed on the proximal end side of the swing pull-tab.

In some embodiments, the driven wheels further comprise driven wheel rotation axes, the driven wheels are located at the proximal ends of the driving wheels, the driven wheel rotation axes of the two driven wheels are parallel to the central axis of the driving wheels, and the driven wheel rotation axes of the two driven wheels are equidistant from the central axis of the driving wheels.

In some embodiments, the housing further comprises a second inner surface provided with at least one stop that limits axial movement of the driven wheel support.

In some embodiments, the swing head pull rod is located between the third surface of the fixed part and the first inner surface of the housing, the driven wheel supporting part of the fixed part is provided with a through hole, and the first matching part of the driven wheel passes through the through hole and then matches with the second matching part of the swing head pull rod.

In some embodiments, the driven wheel further includes a driven wheel rotating shaft, the first inner surface and the second inner surface of the housing are respectively provided with a first fixing hole and a second fixing hole, both ends of the driven wheel rotating shaft respectively enter the first fixing hole and the second fixing hole, and the driven wheel is rotatable around the driven wheel rotating shaft.

In some embodiments, the first matching portion is an eccentric wheel portion, the center of the rotation axis of the driven wheel has a first distance from the central axis of the eccentric wheel portion, the second matching portion is an eccentric wheel matching portion, a matching groove or a third matching hole is formed in the eccentric wheel matching portion, the eccentric wheel portion at least partially enters the matching groove or the third matching hole, and the eccentric wheel matches with the matching groove or the third matching hole to drive the swing rod to move axially.

In some embodiments, the outer contour of the eccentric wheel portion is circular or circular arc, and the fitting groove of the eccentric wheel fitting portion or the third fitting hole is a kidney-shaped groove or a kidney-shaped hole.

In some embodiments, the fitting groove of the eccentric wheel fitting portion or the third fitting hole has a kidney shape including two arc-shaped sides and two straight sides, and a radius of the arc-shaped sides is equal to a radius of the eccentric wheel portion.

In some embodiments, the through hole of the driven wheel support portion has an axial length greater than a radius of the eccentric wheel portion and greater than an axial length of the fitting groove or the third fitting hole of the eccentric wheel fitting portion.

In some embodiments, the distal side and the proximal side of the eccentric wheel fitting portion are respectively provided with a guiding portion longitudinally abutted against the distal side wall and the proximal side wall of the through hole of the driven wheel supporting portion;

the first inner surface of the shell is provided with a guide groove which extends along the axial direction of the anastomat, and the guide part is positioned in the guide groove and limited by the guide groove to move only in the axial direction.

In some embodiments, the gear set includes two driven wheels, the swing mechanism includes two swing pull rods and two swing pull tabs, and in an initial state, the central axes of the eccentric wheel portions of the two driven wheels are both located on the outer side of the corresponding driven wheel rotation axis, or in an initial state, the central axes of the eccentric wheel portions of the two driven wheels are both located on the inner side of the corresponding driven wheel rotation axis.

The embodiment of the utility model also provides a medical anastomat which comprises the head swinging mechanism.

The head swinging mechanism and the medical anastomat provided by the utility model have the following advantages:

according to the utility model, the driving wheel drives the driven wheel to rotate, the rotation motion is converted into the axial motion through the matching of the driven wheel and the swing pull rod, and the swing pull piece is driven to move along the axial direction through the swing pull rod, so that the swing of the nail head of the anastomat relative to the anastomat body can be simply and conveniently realized, the swing direction and the swing angle of the nail head can be flexibly adjusted through the matching of the driving wheel and the driven wheel, the driving wheel and the driven wheel are fixed on the shell of the swing mechanism through the fixing piece, the structural stability of the swing mechanism is favorably maintained, and the situation that the position of the nail head is unstable due to the instability of a gear set in the using process is avoided.

Drawings

Other features, objects and advantages of the present invention will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, with reference to the accompanying drawings.

FIG. 1 is a schematic structural view of a head swing mechanism and a stapler body according to an embodiment of the utility model;

FIG. 2 is a schematic view of the configuration of the engagement of the stud with the closure tab of one embodiment of the present invention;

FIG. 3 is a schematic view of the structure of the stapler body with the second housing omitted and the swinging head mechanism of the stapler body according to an embodiment of the present invention;

FIG. 4 is a schematic view of the structure of the present invention with the housing omitted and the swinging head mechanism engaged with the stapler body;

FIG. 5 is a schematic structural diagram of the head swing mechanism with the housing omitted according to an embodiment of the present invention;

FIG. 6 is a front view of the yaw mechanism with the housing omitted in accordance with one embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a gear unit in accordance with an embodiment of the present invention;

FIG. 8 is a schematic structural view of a swing link according to an embodiment of the present invention;

FIG. 9 is a schematic view of the gear set engaged with the swing rod in an initial state according to an embodiment of the present invention;

FIG. 10 is a schematic view of the gear set engaged with the swing link when the control pin head swings in the direction R1 according to an embodiment of the present invention;

FIG. 11 is a schematic view of the gear set engaged with the swing link when the control pin head swings in the direction R2 according to an embodiment of the present invention;

FIG. 12 is a schematic structural view of a fixing element according to an embodiment of the utility model;

FIG. 13 is a schematic view of a gear set and a fixing member according to an embodiment of the present invention;

FIG. 14 is a schematic view of a fixing member engaged with a swing rod according to an embodiment of the present invention;

FIG. 15 is a schematic structural diagram of a second housing according to an embodiment of the utility model;

FIG. 16 is a schematic view of a fixing member engaged with a second housing according to an embodiment of the present invention;

FIG. 17 is a schematic structural view of a first housing according to an embodiment of the utility model;

fig. 18 is a schematic structural view illustrating a fixing member and a first housing according to an embodiment of the present invention.

Reference numerals:

1 stapler body 52 driven wheel tooth part

11 casing 53 eccentric wheel part

20 third channel 6 swing pull rod

2 eccentric wheel matching part of second shell 61

21 receiving hole 611 kidney-shaped hole

22 second fixing hole 62 guide part

23 stop member 63 pull tab engagement portion

30 first channel 7 fixing piece

3 first casing 71 first fixed part

31 fourth fixing part 72 third fixing part

32 first fixing hole 73 fifth fixing part

33 guide groove 74 driving wheel support part

34 sixth fixing part 741 receding groove

4 driving wheel 75 driven wheel supporting part

41 knob 751 through hole

42 drive sprocket 79 second channel

43 second fixed part 8 swing pull tab

5 driven wheel 9 nail head

51 driven wheel rotating shaft 91 anvil

511 rotating shaft first end 93 connector

512 second end of rotating shaft

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus, a repetitive description thereof will be omitted.

The utility model provides a head swinging mechanism and a medical anastomat comprising the same. The head swinging mechanism comprises a gear set, a head swinging pull rod, a head swinging pull piece, a shell and a fixing piece. The gear train includes action wheel and follows the driving wheel, the drive when the action wheel is rotatory it is rotatory to follow the driving wheel, it includes first cooperation portion to follow the driving wheel. The swing pull rod comprises a second matching part and a pull piece matching part, the pull piece matching part is connected to the swing pull piece, and the second matching part is matched with the first matching part, so that the pull piece matching part of the swing pull rod is driven to move along the axial direction of the anastomat when the driven wheel rotates. The shell comprises a first inner surface and a second inner surface, and an accommodating cavity is defined between the first inner surface and the second inner surface. The fixed part is fixedly arranged in the accommodating cavity, the fixed part comprises a third surface facing the first inner surface and a fourth surface facing the second inner surface, at least part of the gear set is arranged between the fourth surface and the second inner surface of the shell, and the gear set can rotate relative to the fixed part. Therefore, when the operator controls the driving wheel to rotate, the driven wheel can be driven to rotate through the meshing of the gears at the first tooth surface and the second tooth surface. Through the cooperation of the first matching part and the second matching part, the rotary motion of the driven wheel is converted into the axial motion of the swing pull rod, and the swing pull piece is driven to move axially through the swing pull rod, so that the swing of the nail head of the anastomat relative to the anastomat body can be simply and conveniently realized.

The housing includes a receiving cavity that receives the gear set, the housing including a first inner surface. The mounting, the mounting is located the gear train with between the first internal surface of casing, the gear train passes through the mounting is fixed in the first internal surface of casing, just the action wheel with from the driving wheel can for the mounting is rotatory, is favorable to keeping the structural stability of yaw mechanism, avoids leading to the position of pin fin unstable because the unstability of gear train in the use, promotes the operation effect.

In the present invention, the driven wheel refers to a gear provided with a first engagement portion engaged with the swing rod, and the driving wheel refers to a gear engaged with the driven wheel, but not specifically, the driving wheel must drive the driven wheel to rotate. In different embodiments, the driving wheel may rotate to drive the driven wheel to rotate, or the driven wheel may rotate to drive the driving wheel to rotate.

The structure of the head swing mechanism according to various embodiments of the present invention is described in detail below with reference to the accompanying drawings, and it should be understood that the embodiments are not intended to limit the scope of the present invention.

The utility model provides a head swinging mechanism and a medical anastomat comprising the same, and as shown in figures 1 and 2, the medical anastomat comprises a nail head part 9, an anastomat body 1 and a head swinging mechanism arranged between the nail head part 9 and the anastomat body 1. The stapler body 1 comprises a sleeve 11, the distal side of the sleeve 11 being connected to the head 9. The nail head 9 comprises an anvil 91 and a cartridge assembly (not shown in the figures) which are oppositely arranged, and a connecting member 93 which is positioned at the proximal end side of the anvil 91 and the cartridge assembly. The head swinging mechanism comprises a shell and two head swinging pulling pieces 8 arranged in the shell in a penetrating mode, and the shell comprises a first shell 3 and a second shell 2. The swing tab 8 is at least partially located inside the sleeve 11, the sleeve 11 being omitted from fig. 2 to show the cooperation of the swing tab 8 with the stud 9. The distal side of the swing tab 8 is connected to the connector 93. The axial movement of the swing pull tab 8 can control the nail head 9 to swing transversely relative to the axle center S0 of the anastomat. When the two swing pull tabs 8 move axially, the moving directions are opposite. Specifically, in the perspective view of fig. 2, when the swing tab 8 located above moves in the proximal direction and the swing tab 8 located below moves in the distal direction, the nail head 9 swings in the direction R1. When the swing tab 8 located above moves in the distal direction and the swing tab 8 located below moves in the proximal direction, the nail head 9 swings in the direction R2.

In the present invention, the distal end side and the proximal end side are, with respect to the operator, the end closer to the operator is the proximal end side, the end farther from the operator, that is, the end closer to the surgical site is the distal end side, and the direction along the axial center of the stapler is the axial direction, that is, the direction from the distal end side to the proximal end side of the stapler, or the direction from the proximal end side to the distal end side of the stapler. For example, in the perspective of fig. 2, the distal side of the nail head 9 is the left side, and the proximal side is the right side. The direction S1 is the direction from the distal side to the proximal side of the stapler. The direction S1 or the direction opposite to the direction S1 is defined as the axial direction of the stapler. The direction S2 in fig. 2 is defined as the lateral direction of the stapler, i.e., the width direction. The direction S3 in fig. 6 is defined as the longitudinal direction of the stapler, i.e., the height direction. In the present invention, the inner side and the outer side of one member are relative to the axis of the stapler, and the side close to the axis is the inner side and the side far from the axis is the outer side. Hereinafter, for convenience of description, "upper" and "lower" are described in the perspective of the drawings, but these descriptions should not be construed as limiting the present invention. In different embodiments, the relative positional relationship of "upper" and "lower" may be interchanged.

As shown in fig. 3 to 6, the head swing mechanism further includes a gear set, a head swing pull rod 6 and a fixing member 7. The gear set, the swing pull rod 6 and the fixing piece 7 are all accommodated in an accommodating cavity in the shell. The gear train includes a drive pulley 4 and a driven pulley 5, and the drive pulley 4 includes an operation portion and a drive pulley tooth portion 42. In this embodiment, the operation portion is a knob 41 at least partially exposed to the outside of the second housing 2. In another embodiment, the driven wheel 5 may include an operation portion, and the driven wheel 5 may be manually operated to drive the driving wheel 4 to rotate. The driven wheel 5 includes a driven wheel tooth portion 52, a first engagement portion, and a driven wheel rotation shaft 51, and the driven wheel rotation shaft 51 passes through the driven wheel tooth portion 52 and the first engagement portion. The driven wheel teeth 52 mesh with the driving wheel teeth 42, so that the driven wheel 5 can be driven to rotate when the driving wheel 4 rotates. The swing pull rod 6 comprises a second matching part and a pull piece matching part 63, the pull piece matching part 63 is connected to the near end side of the swing pull piece 8, and the second matching part is matched with the first matching part, so that when the driven wheel 5 rotates, the pull piece matching part 63 of the swing pull rod 6 is driven to move along the axial direction of the anastomat. The utility model can flexibly adjust the swinging direction and the swinging angle of the nail head part 9 by controlling the rotating angle of the driving wheel 4 through the matching of the gears of the driving wheel 4 and the driven wheel 5.

In this embodiment, two swing pull rods 6 are provided corresponding to the two swing pull tabs 8, and the two swing pull rods 6 are symmetrically provided with respect to the axial direction of the stapler. When the driving wheel 4 rotates, the moving directions of the two swing-head pull rods 6 are opposite. And two of the driven wheels 5 are correspondingly arranged, and the two driven wheels 5 are positioned at the proximal end side of the driving wheel 4. The two driven wheels 5 are symmetrically arranged relative to the axis of the anastomat, the central axes of the two driven wheels 5 are parallel to the central axis of the driving wheel 4, and the distances from the central axes of the two driven wheels 5 to the central axis of the driving wheel 4 are equal. The shape of the accommodating cavity enclosed by the first shell 3 and the second shell 2 is adapted to the shape of the gear set.

When the operator controls the driving wheel 4 to rotate, the driven wheel 5 can be driven to rotate by the gear engagement at the driving wheel tooth portion 42 and the driven wheel tooth portion 52. Through the cooperation of the first matching part and the second matching part, the rotary motion of the driven wheel 5 is converted into the axial motion of the swing pull rod 6, and the swing pull piece 8 is driven to move along the axial direction through the swing pull rod 6, so that the swing of the nail head part 9 of the anastomat relative to the anastomat body can be simply and conveniently realized.

The shell comprises a first inner surface and a second inner surface, and an accommodating cavity is defined by the first inner surface and the second inner surface. As shown in fig. 1 and 3, in this embodiment, the housing is divided into a first housing 3 located below and a second housing 2 located above, the first housing 3 and the second housing 2 defining therein a third passage 20 for passing through the sleeve 11. The first inner surface is an inner surface of the first housing 3, and the second inner surface is an inner surface of the second housing 2. The fixing piece 7 is located between the gear set and the inner surface of the first shell 3, the gear set is fixed on the inner surface of the first shell 3 through the fixing piece 7, and the driving wheel 4 and the driven wheel 5 can rotate relative to the fixing piece 7, so that the structural stability of the head swinging mechanism is kept, the position instability of the head part 9 caused by the instability of the gear set in the using process is avoided, and the operation effect is improved. As shown in fig. 3 and 4, the fixing member 7 includes a third surface facing the first inner surface and a fourth surface facing the second inner surface. The gear set is at least partially disposed between the fourth surface and the second inner surface of the stationary member 7. The swing pull rod 6 is arranged between the third surface of the fixing piece 7 and the first inner surface, and the fixing piece 7 and the swing pull rod 6 are fixed relative to the shell in the height direction.

As shown in fig. 5 to 9, the first engaging portion is an eccentric wheel portion 53, and the second engaging portion is an eccentric wheel engaging portion 61, and is engaged with the eccentric wheel portion 53, so that when the driven wheel 5 rotates, the pull-tab engaging portion 63 of the swing rod 6 is driven to move along the axial direction of the stapler, and the rotational movement of the driven wheel 5 is converted into the axial movement of the swing rod 6. In this embodiment, the outer contour of the eccentric wheel portion 53 is circular or circular arc. In other embodiments, the outer contour of the eccentric wheel portion 53 may have other shapes, such as a triangle or other polygon. The driven wheel rotation shaft 51 passes through the center of the driven wheel tooth portion 52. However, the eccentric wheel portion 53 is disposed eccentrically with respect to the driven wheel rotation shaft 51, i.e., the center of the driven wheel rotation shaft 51 is a first distance d1 from the central axis O1 of the eccentric wheel portion 53. A third matching hole is formed in the eccentric wheel matching part 61 of the swinging head pull rod 6, and at least part of the eccentric wheel part 53 enters the third matching hole. In another alternative embodiment, the eccentric cam engagement portion 61 of the rocker arm 6 may also have an engagement groove, into which the eccentric cam portion 53 at least partially enters.

As shown in fig. 3 and 8, the inner surface of the first housing 3 is provided with a guide groove 33, the guide groove 33 extends along the axial direction of the stapler, the swing head pull rod 6 further comprises a guide portion 62, the guide portion 62 is located in the guide groove 33, and is limited by the guide groove 33 to move only in the axial direction, so that when the driving wheel 4 rotates, the swing head pull rod 6 is ensured to move only in the axial direction without lateral deflection. Specifically, in this embodiment, the swing link 6 includes two guide portions 62, the two guide portions 62 are located on the distal end side and the proximal end side of the eccentric wheel fitting portion 61, respectively, and the guide portions 62 are in the form of a bar extending in the axial direction of the stapler.

As shown in fig. 5, the pull-tab fitting portion 63 is a protruding portion provided on the inner side of the eccentric wheel fitting portion 61, a hole fitted with the protruding portion is provided on the proximal end side of the swing tab 8, and the protruding portion is embedded in the hole on the proximal end side of the swing tab 8. The preferred right angle face of each side of bellying guarantees the bellying with swing head pulling-on piece 8 complex stability avoids both unexpected slippage. Preferably, the protrusion is disposed at an axial center of the swing pull rod 6, that is, a distance from a center of the protrusion to a distal end of the swing pull rod 6 is equal to a distance from the center of the protrusion to a proximal end of the swing pull rod 6, and when the swing pull tab 8 is pulled to move axially, the swing pull rod 6 is further prevented from being laterally swung due to an external force. In another alternative embodiment, the pull tab engagement portion 63 may also be a groove provided on the inner side of the eccentric wheel engagement portion 61, the proximal end side of the swing tab 8 is provided with a projection engaged with the groove, the projection is embedded in the groove, and the groove is preferably provided at the center position of the swing rod 6 in the axial direction. In this embodiment, the inner side surface of the eccentric wheel fitting part 61 is a plane parallel to the axial direction of the stapler, so that the sheet structure of the swing pull tab 8 can be better adapted.

The head swing operation principle of the head swing mechanism according to this embodiment will be described in detail with reference to fig. 9 to 11.

As shown in fig. 9, in the transverse direction of the stapler, the two guide portions 62 are respectively connected to the middle portions of the distal end surface and the proximal end surface of the eccentric wheel matching portion 61, so that the limiting effect of the guide groove 33 on the guide portions 62 can be more evenly applied to each position of the swing head pull rod 6, and further the swing head pull rod 6 is kept from transverse deflection due to the rotation movement of the eccentric wheel portion 53 during movement. The third matching hole of the eccentric wheel matching part 61 is a waist-shaped hole 611 which comprises two arc-shaped edges and two straight edges, the radius of the arc-shaped edges is equal to that of the eccentric wheel part 53, and the two straight edges of the waist-shaped hole 611 extend transversely to the anastomat. In another alternative embodiment, the shape of the kidney-shaped hole 611 may also be different from the kidney-shaped shape shown in fig. 9, as long as it can be realized that the eccentric wheel fitting portion 61 is pushed to move in the axial direction by the driving of the eccentric wheel portion 53 when the eccentric wheel portion 53 rotates. Fig. 9 shows the matching structure of the driving wheel 4, the driven wheel 5 and the swing head pull rod 6 in the initial state. In the initial state, the central axes O1 of the eccentric wheel portions 53 of the two driven wheels 5 are both positioned outside the corresponding driven wheel rotation shafts 51. Therefore, when the driving wheel 4 drives the driven wheels 5 to rotate, the two driven wheels 5 can drive the two swing pull rods 6 to move in opposite directions. In another alternative embodiment, the central axes of the eccentric wheel portions 53 of the two driven wheels 5 may be located inside the corresponding driven wheel rotation shafts 51 in the initial state.

As shown in fig. 10, when the primary pulley 4 is operated to rotate 15 ° in the R3 direction in the initial state, the primary pulley 4 drives the secondary pulley 5 to rotate by a certain angle in the R4 direction (the angle depends on the gear ratio of the primary pulley 4 and the secondary pulley 5). The upper swing link 6 shown in fig. 10 moves in the direction W1, i.e., in the distal direction, as compared with fig. 9, and the lower swing link 6 moves in the direction W2, i.e., in the proximal direction, as compared with fig. 9, so that the nail head 9 can swing in the direction R1 as shown in fig. 2.

As shown in fig. 11, when the primary pulley 4 is operated to rotate 30 ° in the R5 direction in the initial state, the primary pulley 4 drives the secondary pulley 5 to rotate by a certain angle in the R6 direction (the angle depends on the gear ratio of the primary pulley 4 and the secondary pulley 5). The upper swing link 6 shown in fig. 11 moves in the direction W3, i.e., in the proximal direction, as compared to fig. 9, and the lower swing link 6 moves in the direction W4, i.e., in the distal direction, as compared to fig. 9, so that the nail head 9 can swing in the direction R2 shown in fig. 2. As can be seen by comparing fig. 10 and 11, when the rotation direction of the driver 4 is different, the rotation direction of the head 9 can be made different. When the rotation angles of the driving wheel 4 are different, the moving displacement of the swing pull rod 6 is different, so that the swing angle of the nail head part 9 is also different. The larger the rotation angle of the driving wheel 4 is, the larger the movement displacement of the swing pull rod 6 is, and the larger the swing angle of the nail head part 9 is, thereby flexibly controlling the swing direction and swing angle of the nail head part 9.

The following describes the structural relationship between the fixing member 7 and each of the other components of the present invention with reference to fig. 3, 7, and 12 to 18. As shown in fig. 3 and 12, the fixing member 7 includes a driving wheel support portion 74 and two driven wheel support portions 75. The driving wheel supporting portion 74 is located between the driving wheel 4 and the inner surface of the first housing 3, and the driven wheel supporting portion 75 is located between the driven wheel 5 and the inner surface of the first housing 3. The swing link 6 is located between the driven wheel support portion 75 and the inner surface of the first housing 3. The driving wheel supporting portion 74 faces one side of the inner surface of the first housing 3 and is provided with a yielding groove 741, as shown in fig. 17, a position, corresponding to the yielding groove 741, of the inner surface of the first housing 3 is provided with a sleeve limiting portion 35, the yielding groove 741 and the sleeve limiting portion 35 enclose a first channel 30 extending in the axial direction, and the sleeve 11 outside the head swinging pull piece 8 penetrates through the first channel 30. The surface of the receding groove 741 is preferably an arc surface, and the surface of the sleeve limiting portion 35 is also preferably an arc surface, so that the first channel 30 is a cylindrical channel formed by enclosing, and forms a better fit with the outer side surface of the cylindrical sleeve 11, and can also support the sleeve 11 well. As shown in fig. 12, an axially extending second passage 79 is formed between the two driven wheel support portions 75 to provide a second passage 79 for the proximal end of the cannula 11 to pass through.

As shown in fig. 12 and 13, the driven wheel support portion 75 of the fixed member 7 is provided with a through hole 751, the driven wheel rotation shaft 51 passes through the through hole 751, and the eccentric wheel portion 53 of the driven wheel 5 passes through the through hole 751 to be engaged with the eccentric wheel engaging portion 61 of the swing rod 6. Therefore, in this embodiment, the driving gear portion 42 of the driving gear 4 and the driven gear portion 52 of the driven gear 5 are disposed between the fourth surface of the fixed member 7 and the second inner surface of the housing, and since the swing head lever 6 is disposed between the third surface of the fixed member 7 and the first inner surface of the housing, the eccentric gear portion 53 is engaged with the swing head lever 6 after passing through the through hole 751 of the fixed member 7. As shown in fig. 13 and 14, the through hole 751 of the driven wheel support portion 75 has an axial length larger than the radius of the eccentric wheel portion 53 and larger than the axial length of the waist hole 611 of the eccentric wheel fitting portion 61, and when the eccentric wheel portion 53 rotates, the through hole 751 can provide a sufficient space for the eccentric rotation of the eccentric wheel portion 53 and the axial movement of the eccentric wheel fitting portion 61. The guide portion 62 longitudinally abuts against the distal end side wall and the proximal end side wall of the through hole 751 of the driven wheel support portion 75 to maintain a relatively stable positional relationship between the fixing member 7 and the yaw lever 6.

As shown in fig. 7 and 13, a first fixing portion 71 is disposed on a side of the driving wheel supporting portion 74 facing the driving wheel 4, a second fixing portion 43 is disposed on a side of the driving wheel 4 facing the fixing member 7, and the first fixing portion 71 and the second fixing portion 43 form an embedded connection. In this embodiment, the first fixing portion 71 is a first fixing column disposed on the driving wheel supporting portion 74 and protruding toward the driving wheel 4, the second fixing portion 43 is a cylindrical recess opened on a side toward the fixing member 7, the recess is disposed coaxially with the driving wheel 4, and the first fixing column at least partially enters the recess and enables the driving wheel 4 to rotate relative to the first fixing portion 71. In another alternative embodiment, the first fixing portion may be a groove disposed on one side of the driving wheel supporting portion 74 facing the driving wheel 4, and the second fixing portion is a first fixing column disposed on the driving wheel 4 and protruding toward the fixing member, the first fixing column and the driving wheel 4 are coaxially disposed, and at least a portion of the first fixing column enters the groove.

As shown in fig. 15 and 17, the inner surface of the first housing 3 and the inner surface of the second housing 2 are provided with a first fixing hole 32 and a second fixing hole 22, respectively, the first end 511 and the second end 512 of the driven wheel rotation shaft 51 enter the first fixing hole 32 and the second fixing hole 22, respectively, and the driven wheel 5 is rotatable about the driven wheel rotation shaft 51. Here, the driven wheel tooth portion 52 and the eccentric wheel portion 53 may be rotatably provided around the driven wheel rotation shaft 51, the driven wheel rotation shaft 51 may be non-rotatably fixed to the second fixed hole 22 and the first fixed hole 32, the driven wheel tooth portion 52 and the eccentric wheel portion 53 may be rotatably provided with respect to the driven wheel rotation shaft 51, the driven wheel rotation shaft 51 may be rotatably fitted into the second fixed hole 22 and the first fixed hole 32, the driving wheel tooth portion 42 and the eccentric wheel portion 53 may be non-rotatably fitted to the driven wheel rotation shaft 51, and the driving wheel tooth portion 42 and the eccentric wheel portion 53 may be rotatable together with the driven wheel rotation shaft 51 around the axis of the driven wheel rotation shaft 51. The third channel 20 marked in fig. 15 and 17 is a part of the third channel, and after the first housing 2 and the second housing 3 are combined, the two parts are combined into a complete third channel 20.

As shown in fig. 15 and 16, a receiving hole 21 is provided in a surface of the second housing 2, and the knob 41 is exposed to the outside of the second housing 2 through the receiving hole 21. The fixing element 7 enters at least partially into the receiving space of the second housing 2. At least one limiting member 23 is disposed on the inner surface of the second casing 2, the limiting members 23 are distributed on the outer side of the driven wheel supporting portion 75, and the limiting members 23 limit the axial movement of the driven wheel supporting portion 75.

As shown in fig. 14, 17 and 18, a third fixing portion 72 is disposed on a side of the driver supporting portion 74 facing the inner surface of the first housing 3, a fourth fixing portion 31 is disposed on the inner surface of the first housing 3, and the third fixing portion 72 and the fourth fixing portion 31 form a fitting connection. In this embodiment, the third fixing portion 72 is a second fixing column protruding toward the inner surface of the first housing 3, the fourth fixing portion 31 is a first supporting seat disposed on the inner surface of the first housing 3, a first fitting hole is opened at the center of the first supporting seat, and the second fixing column at least partially enters the first fitting hole. The third fixing portion 72 and the fourth fixing portion 31 form a non-rotatable connection, for example, the third fixing portion 72 and the fourth fixing portion 31 may be in an interference fit. In addition, since the driving wheel supporting portion 74 is provided with two laterally arranged third fixing portions 72, and the first housing 3 is provided with two laterally arranged fourth fixing portions 31, the third fixing portions 72 and the fourth fixing portions 31 can be further prevented from rotating. In another alternative embodiment, the third fixing portion 72 may include a first engaging hole, and the fourth fixing portion 31 is a fixing column protruding toward the driver supporting portion 74, or a fixing hole corresponding to the second fixing column is directly formed on the inner surface of the first housing 3. In a preferred embodiment, the third fixing portion 72 is a fixing hole with a non-circular cross section, and the fourth fixing portion 31 is a fixing hole with a non-circular cross section, such as: triangular or polygonal in cross-section to prevent rotational movement between the fixing 7 relative to the housing.

As shown in fig. 14, 17 and 18, a fifth fixing portion 73 is disposed on a side of the driven wheel supporting portion 75 facing the inner surface of the first housing 3, a sixth fixing portion 34 is disposed on the inner surface of the first housing 3, and the fifth fixing portion 73 and the sixth fixing portion 34 form a fitting connection. In this embodiment, the fifth fixing portion 73 is a third fixing column protruding toward the inner surface of the first housing 3, the sixth fixing portion 34 is a second supporting seat disposed on the inner surface of the first housing 3, a second fitting hole is opened at the center of the second supporting seat, and the third fixing column at least partially enters the second fitting hole. The fifth fixing portion 73 and the sixth fixing portion 34 form a non-rotatable connection, for example, the third fixing portion 72 and the fourth fixing portion 31 may be in an interference fit. In addition, since the fixing member 7 is provided with two laterally arranged fifth fixing portions 73, and the first housing 3 is provided with two laterally arranged sixth fixing portions 34, the fifth fixing portions 73 and the sixth fixing portions 34 can be further prevented from rotating. In another alternative embodiment, the fifth fixing portion 73 may include a second fitting hole, and the sixth fixing portion 34 is a fixing post protruding toward the driven wheel supporting portion 75, or a fixing hole corresponding to a third fixing post may be directly provided on the inner surface of the first housing 3.

The foregoing is a more detailed description of the utility model in connection with specific preferred embodiments and it is not intended that the utility model be limited to these specific details. For those skilled in the art to which the utility model pertains, several simple deductions or substitutions can be made without departing from the spirit of the utility model, and all shall be considered as belonging to the protection scope of the utility model.

Claims

1. A yaw mechanism for a medical stapler, the yaw mechanism comprising:

2. The yaw mechanism of claim 1, wherein the yaw rod is disposed between the third surface and the first inner surface of the housing, and the fixing member and the yaw rod are fixed in a height direction with respect to the housing.

3. The yaw mechanism of claim 1, wherein the fixed member includes a drive wheel support portion and a driven wheel support portion, the drive wheel support portion being located between the drive wheel and the first interior surface of the housing, the driven wheel support portion being located between the driven wheel and the first interior surface of the housing.

4. The head oscillating mechanism according to claim 3, wherein a first fixing portion is disposed on a side of the driving wheel supporting portion facing the driving wheel, a second fixing portion is disposed on a side of the driving wheel facing the fixing member, the first fixing portion and the second fixing portion form an embedded connection, and the driving wheel is rotatable relative to the first fixing portion.

5. The yaw mechanism of claim 4, wherein said drive wheel further comprises an operating portion and a drive wheel tooth portion, said operating portion being disposed on a side of said drive wheel tooth portion facing the second inner surface of said housing, said first fixing portion being disposed on a side of said drive wheel tooth portion facing the first inner surface of said housing;

6. The head swinging mechanism according to claim 4, wherein the first fixing portion is a first fixing column disposed on the driving wheel supporting portion and protruding toward the driving wheel, the second fixing portion is a groove disposed on a side of the driving wheel facing the fixing member, the groove is disposed coaxially with the driving wheel, and the first fixing column at least partially enters the groove; or the like, or a combination thereof,

the first fixing portion is arranged in a groove formed in one side, facing the driving wheel, of the driving wheel supporting portion, the second fixing portion is arranged in a first fixing column protruding from the fixing piece, facing the driving wheel, the first fixing column and the driving wheel are coaxially arranged, and at least part of the first fixing column enters the groove.

7. The head oscillating mechanism according to claim 3, wherein a third fixing portion is disposed on a side of the driving wheel supporting portion facing the first inner surface of the housing, a fourth fixing portion is disposed on the first inner surface of the housing, and the third fixing portion and the fourth fixing portion form a fitting connection; and/or the presence of a gas in the gas,

8. The head oscillating mechanism according to claim 7, wherein the third fixing portion is a second fixing post protruding toward the first inner surface of the housing, the fourth fixing portion is a first supporting seat disposed on the first inner surface of the housing, a first fitting hole is opened at a center of the first supporting seat, the second fixing post at least partially enters the first fitting hole, or the third fixing portion includes the first fitting hole, the fourth fixing portion is a second fixing post disposed on the housing toward the driving wheel supporting portion, the second fixing post at least partially enters the first fitting hole;

9. The head swinging mechanism according to claim 3, wherein a yielding groove is formed in one side of the driving wheel supporting portion facing the first inner surface of the housing, a sleeve limiting portion is arranged at a position of the housing opposite to the yielding groove, and the yielding groove and the sleeve limiting portion enclose a first channel along the axial direction.

10. The head oscillating mechanism according to claim 9, wherein the surfaces of the abdicating groove and the sleeve limiting part are both arc surfaces, and the first channel is a cylindrical channel.

11. The head swinging mechanism according to claim 3, wherein the gear set comprises two driven wheels, the head swinging mechanism comprises two head swinging pull rods and two head swinging pull pieces, when the driving wheel rotates, the driven wheels drive the two head swinging pull rods to move axially, and the moving directions of the two head swinging pull rods are opposite;

12. The head swing mechanism according to claim 11, wherein the head swing and pull tab engaging portion is a protrusion disposed on an inner side of the second engaging portion, and a proximal side of the head swing and pull tab is provided with a hole engaged with the protrusion, or the head swing and pull tab engaging portion is a groove disposed on an inner side of the second engaging portion, and a proximal side of the head swing and pull tab is provided with a protrusion engaged with the groove.

13. The yaw mechanism of claim 11, wherein the driven wheels further comprise driven wheel rotation axes, the driven wheels are located at a proximal end of the drive wheel, the driven wheel rotation axes of the two driven wheels are parallel to a central axis of the drive wheel, and the driven wheel rotation axes of the two driven wheels are equidistant from the central axis of the drive wheel.

14. The yaw mechanism of claim 3 wherein said housing further comprises a second inner surface, said second inner surface being provided with at least one stop that limits axial movement of said driven wheel support.

15. The yaw mechanism of claim 3, wherein the yaw rod is located between the third surface of the fixed member and the first inner surface of the housing, the driven wheel support portion of the fixed member is provided with a through hole, and the first engagement portion of the driven wheel is engaged with the second engagement portion of the yaw rod after passing through the through hole.

16. The head oscillating mechanism of claim 15, wherein the driven wheel further comprises a driven wheel rotating shaft, the first inner surface and the second inner surface of the housing are respectively provided with a first fixing hole and a second fixing hole, two ends of the driven wheel rotating shaft respectively enter the first fixing hole and the second fixing hole, and the driven wheel is capable of rotating around the driven wheel rotating shaft.

17. The head oscillating mechanism according to claim 16, wherein the first engaging portion is an eccentric wheel portion, a center of a rotation axis of the driven wheel is a first distance from a central axis of the eccentric wheel portion, the second engaging portion is an eccentric wheel engaging portion, an engaging groove or a third engaging hole is formed in the eccentric wheel engaging portion, the eccentric wheel portion at least partially enters the engaging groove or the third engaging hole, and the eccentric wheel engages with the engaging groove or the third engaging hole to drive the oscillating rod to move in the axial direction.

18. The head oscillating mechanism according to claim 17, wherein the outer contour of the eccentric wheel portion is circular or circular arc, and the fitting groove of the eccentric wheel fitting portion or the third fitting hole is a kidney-shaped groove or a kidney-shaped hole.

19. The yaw mechanism of claim 17, wherein the fitting groove of the eccentric wheel fitting portion or the third fitting hole is kidney-shaped including two arc-shaped sides and two straight sides, the radius of the arc-shaped sides being equal to the radius of the eccentric wheel portion.

20. The yaw mechanism of claim 17, wherein the through hole of the driven wheel support portion has an axial length greater than a radius of the eccentric wheel portion and greater than an axial length of the fitting groove of the eccentric wheel fitting portion or the third fitting hole.

21. The yaw mechanism of claim 20, wherein a distal side and a proximal side of the eccentric wheel fitting portion are respectively provided with a guide portion longitudinally abutting against a distal side wall and a proximal side wall of the through hole of the driven wheel support portion;

the first inner surface of the shell is provided with a guide groove, the guide groove extends along the axial direction of the anastomat, and the guide part is positioned in the guide groove and limited by the guide groove to move only in the axial direction.

22. The yaw mechanism of claim 17, wherein the gear set comprises two driven wheels, the yaw mechanism comprises two yaw rods and two yaw pull tabs, and a central axis of an eccentric wheel portion of each of the two driven wheels is located outside a corresponding driven wheel rotation axis in an initial state, or a central axis of an eccentric wheel portion of each of the two driven wheels is located inside a corresponding driven wheel rotation axis in an initial state.

23. A medical stapler, characterized in that it comprises a head swinging mechanism according to any one of claims 1 to 22.