CN116138826A - Swing mechanism and medical anastomat - Google Patents

Abstract

The invention 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 swinging head pull rod comprises a second matching part and a pull piece matching part, the pull piece matching part is connected to the swinging head 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 swinging head 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 is enclosed into a containing cavity; the fixing piece is fixedly arranged in the accommodating cavity and comprises a third surface and a fourth surface, the gear set is at least partially 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 invention can simply and conveniently realize the swinging 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 swinging mechanism.

Description

Swing mechanism and medical anastomat

Technical Field

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

To accommodate the need for more surgical scenarios, it is desirable that the staple head be more angularly selectable relative to the stapler body. Thus, a head-swing mechanism may be provided between the stapler body and the head portion, the head-swing mechanism comprising a head-swing pull tab, the distal end of the head-swing pull tab being connected to the head portion, the distal end side of the head-swing pull lever driving the head portion to swing clockwise or counterclockwise relative to the stapler body when the head-swing pull lever is driven to move in the axial direction of the stapler.

The existing swing mechanism is generally complex in structure, when the swing head swings, the swing angle is difficult to set, and in the use process, the phenomenon of uncontrollable swing of the nail head can occur, so that the swing angle of the nail head is uncontrollable, the nail head of the anastomat cannot be accurately positioned, and the operation effect is affected.

In the present invention, the distal end side and the proximal end side are the proximal end side with respect to the operator, and the end closer to the operator, that is, the end closer to the surgical site is the distal end side. In the anastomat, the inner side and the outer side are relative to the axis of the anastomat, the side close to the axis is the inner side, and the side far away from the axis is the outer side.

Disclosure of Invention

Aiming at the problems in the prior art, the invention aims to provide a head swinging mechanism and a medical anastomat, which can simply and conveniently realize the swinging of the nail head of the anastomat relative to an 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.

The embodiment of the invention 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 head pull rod comprises a second matching part and a pull piece matching part, the pull piece matching part is connected with the swing head 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 head 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 defined between the first inner surface and the second inner surface;

the fixing piece is fixedly arranged in the accommodating cavity, the fixing piece comprises a third surface facing the first inner surface and a fourth surface facing the second inner surface, the gear set is at least partially 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 link is disposed between the third surface and the first inner surface of the housing, and the fixing member and the swing link are fixed relative to the housing in a height direction.

In some embodiments, the mount includes a drive wheel support located between the drive wheel and the first inner surface of the housing and a driven wheel support 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 support 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 can rotate relative to the first fixing portion.

In some embodiments, the housing further comprises a second inner surface, the drive wheel further comprises an operation portion and a driving gear tooth portion, the operation portion is disposed on a side of the driving gear tooth portion facing the second inner surface of the housing, and the first fixing portion is disposed on a side of the driving gear 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 of the driven wheel tooth part facing the first inner surface;

the driving gear tooth portion and the driven gear tooth portion 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 arranged on the supporting portion of the driving wheel and protruding towards the driving wheel, the second fixing portion is a groove formed on one side of the driving wheel towards the fixing piece, the groove and the driving wheel are coaxially arranged, and the first fixing column at least partially enters the groove; or alternatively, the first and second heat exchangers may be,

the first fixing part is a groove arranged on one side of the driving wheel supporting part, which faces the driving wheel, the second fixing part is a first fixing column arranged on the first fixing column, which faces the fixing piece, and protrudes out, 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, facing the first inner surface of the housing, of the driving wheel supporting portion, 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 number of the groups of groups,

a fifth fixing part is arranged on one side, facing the first inner surface of the shell, of the driven wheel supporting part, a sixth fixing part is arranged on the first inner surface of the shell, and the fifth fixing part and the sixth fixing part are connected in an embedded mode.

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

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

In some embodiments, the surface of the relief groove and the surface of the sleeve stopper are both circular 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 along the axial direction, and the movement directions of the two swing pull rods are opposite;

the fixing piece comprises two driven wheel supporting parts, and a second channel extending in the axial direction is formed between the two driven wheel supporting parts.

In some embodiments, the fitting portion of the swing pull tab is a protruding portion disposed on an inner side of the second fitting portion, and a hole that fits with the protruding portion is disposed on a proximal side of the swing pull tab, or the fitting portion of the swing pull tab is a groove disposed on an inner side of the second fitting portion, and a protruding portion that fits with the groove is disposed on a proximal side of the swing pull tab.

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

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

In some embodiments, the swing pull rod is located between the third surface of the fixing piece and the first inner surface of the shell, the driven wheel supporting portion of the fixing piece is provided with a through hole, and the first matching portion of the driven wheel passes through the through hole and then is matched with the second matching portion of the swing pull rod.

In some embodiments, the driven wheel further includes a driven wheel rotation 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 rotation shaft respectively enter the first fixing hole and the second fixing hole, and the driven wheel can rotate around the driven wheel rotation shaft.

In some embodiments, the first matching portion is an eccentric wheel portion, a first distance is reserved between the center of the driven wheel rotating shaft and the central shaft 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 is matched with the matching groove or the third matching hole to drive the swing pull rod to move axially.

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

In some embodiments, the mating groove of the eccentric mating portion or the third mating hole is kidney-shaped including two arcuate sides and two straight sides, the radius of the arcuate sides being equal to the radius of the eccentric portion.

In some embodiments, the axial length of the through hole of the driven wheel support is greater than the radius of the eccentric wheel portion and greater than the axial length of the mating groove or third mating hole of the eccentric wheel mating portion.

In some embodiments, the distal end side and the proximal end side of the eccentric wheel matching part are respectively provided with a guiding part, and the guiding parts are abutted with the distal end side wall and the proximal end side wall of the through hole of the driven wheel supporting part in the longitudinal direction;

The first inner surface of the housing is provided with a guide groove extending in the axial direction of the stapler, the guide portion being located in the guide groove and being limited by the guide groove to only axial movement.

In some embodiments, the gear set includes two driven wheels, the swing mechanism includes two swing pull rods and two swing pull pieces, and in an initial state, central axes of eccentric wheel portions of the two driven wheels are located outside corresponding driven wheel rotating shafts, or in an initial state, central axes of eccentric wheel portions of the two driven wheels are located inside corresponding driven wheel rotating shafts.

The embodiment of the invention also provides a medical anastomat, which comprises the head swinging mechanism.

The swing mechanism and the medical anastomat provided by the invention have the following advantages:

according to the invention, the driven wheel is driven to rotate by the driving wheel, the rotary motion is converted into the axial motion by the cooperation of the driven wheel and the swing head pull rod, and the swing head pull piece is driven to move along the axial direction by the swing head 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 by the cooperation of the driving wheel and the driven wheel, and the driving wheel and the driven wheel are fixed on the shell of the swing head mechanism by the fixing piece, thereby being beneficial to keeping the structural stability of the swing head mechanism and avoiding the unstable position of the nail head caused by the unstable gear group in the use process.

Drawings

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

FIG. 1 is a schematic view of a swing mechanism and stapler body according to an embodiment of the present invention;

FIG. 2 is a schematic view of the configuration of the engagement of the staple head with the closure tab in accordance with one embodiment of the present invention;

FIG. 3 is a schematic view of an embodiment of the present invention omitting the cooperation of the second housing swing-back mechanism and the stapler body;

FIG. 4 is a schematic view of an embodiment of the invention omitting the cooperation of the housing swing-back mechanism and the stapler body;

FIG. 5 is a schematic view of a swing mechanism of an embodiment of the present invention with a housing omitted;

FIG. 6 is a front view of the swing mechanism with the housing omitted in an embodiment of the invention;

FIG. 7 is a schematic representation of the structure of a gear set according to an embodiment of the present invention;

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

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

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

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

FIG. 12 is a schematic view of a fixing member according to an embodiment of the present invention;

FIG. 13 is a schematic diagram of a gear set engaged with a fixture according to an embodiment of the present invention;

FIG. 14 is a schematic view showing the configuration of the fixing member and the swing link according to an embodiment of the present invention;

FIG. 15 is a schematic view of the structure of a second housing according to an embodiment of the present invention;

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

FIG. 17 is a schematic view of the structure of a first housing according to an embodiment of the present invention;

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

Reference numerals:

1. driven gear tooth portion of anastomat body 52

11. Eccentric wheel part of sleeve 53

20. Third channel 6 swing pull rod

2. Eccentric wheel matching part of second shell 61

21. Waist-shaped hole of receiving hole 611

22. Second fixing hole 62 guide part

23. Fitting part of limiting piece 63 pull tab

30. First channel 7 fixture

3. First housing 71 first fixing portion

31. Fourth fixing portion 72 third fixing portion

32. Fifth fixing portion of first fixing hole 73

33. Guide groove 74 driving wheel supporting portion

34. Sixth fixing part 741 abdication groove

4. Driving wheel 75 driven wheel supporting part

41. Knob 751 through hole

42. Second channel of driving gear tooth portion 79

43. Second fixing part 8 swing head pull piece

5. Driven wheel 9 nail head

51. Driven wheel rotary shaft 91 nail anvil

511. First end 93 connector of rotating shaft

512. Second end of the rotating shaft

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many 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 the 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 invention provides a head swinging mechanism and a medical anastomat comprising the same. The swing mechanism comprises a gear set, a swing pull rod, a swing pull piece, a shell and a fixing piece. 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 with 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 a containing cavity is defined between the first inner surface and the second inner surface. The fixing piece is fixedly arranged in the accommodating cavity, the fixing piece comprises a third surface facing the first inner surface and a fourth surface facing the second inner surface, the gear set is at least partially arranged between the fourth surface and the second inner surface of the shell, and the gear set can rotate relative to the fixing piece. Thus, when the operator controls the driving wheel to rotate, the driven wheel can be driven to rotate by the gear engagement at the first tooth surface and the second tooth surface. The rotary motion of the driven wheel is converted into the axial motion of the swing pull rod through the cooperation of the first cooperation part and the second cooperation part, and the swing pull rod drives the swing pull piece to move along the axial direction, so that the swing of the nail head part of the anastomat relative to the anastomat body can be realized simply and conveniently.

The housing includes a receiving cavity for receiving the gear set, the housing including a first interior surface. The fixing piece is located between the gear set and the first inner surface of the shell, the gear set is fixed on the first inner surface of the shell through the fixing piece, and the driving wheel and the driven wheel can rotate relative to the fixing piece, so that the structural stability of the swing head mechanism is maintained, the unstable position of the nail head due to the instability of the gear set in the use process is avoided, and the operation effect is improved.

In the present invention, the driven wheel refers to a gear provided with a first engaging portion engaged with the swing link, and the driving wheel refers to a gear engaged with the driven wheel, but it is not particularly necessary that the driving wheel drives 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 following describes the structure of the swing mechanism of each embodiment of the present invention in detail with reference to the accompanying drawings, and it is to be understood that each embodiment is not a limitation of the protection scope of the present invention.

The invention provides a head swing mechanism and a medical anastomat comprising the same, as shown in fig. 1 and 2, the medical anastomat comprises a nail head 9, an anastomat body 1 and the head swing mechanism arranged between the nail head 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 head 9 includes an anvil 91 and a cartridge assembly (not shown) disposed opposite each other and a connector 93 on a proximal side of the anvil 91 and cartridge assembly. The swing mechanism comprises a shell and two swing pull pieces 8 penetrating through the shell, and the shell comprises a first shell 3 and a second shell 2. The swing tab 8 is at least partially 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 head pull piece 8 can control the nail head 9 to swing transversely relative to the axis S0 of the anastomat. When the two swing pull pieces 8 axially move, the movement directions are opposite. Specifically, in the 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 swing of the head 9 in the R1 direction is achieved. The swing pull tab 8 located above moves in the distal direction, and when the swing pull tab 8 located below moves in the proximal direction, the swing of the head 9 in the R2 direction is achieved.

In the present invention, the distal end side and the proximal end side are the proximal end side with respect to the operator, the end closer to the operator, the end farther from the operator, i.e., the end closer to the operation position, are the distal end sides, and the direction along the axis of the stapler is the axial direction, i.e., 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 view of fig. 2, the distal end side of the nail head 9 is the left side, and the proximal end side is the right side. The S1 direction is the direction from the distal end side to the proximal end side of the stapler. The direction S1 or the direction opposite to the direction S1 is defined as the axial direction of the anastomat. The direction S2 in fig. 2 is defined as the transverse direction of the stapler, i.e. the width direction. The S3 direction 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 are the inner side and the outer side of the axis of the stapler and the side away from the axis, respectively, with respect to the axis of the stapler. For convenience of description, the "upper" and "lower" are described in view of the drawings, but these descriptions should not be construed as limitations of the present invention. In various embodiments, the relative positional relationship of "up" and "down" may be interchanged.

As shown in fig. 3 to 6, the swing mechanism further includes a gear set, a 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 set comprises a driving wheel 4 and a driven wheel 5, wherein the driving wheel 4 comprises an operation part and a driving gear tooth part 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 pulley 5 includes a driven pulley tooth portion 52, a first mating portion, and a driven pulley rotation shaft 51, and the driven pulley rotation shaft 51 passes through the driven pulley tooth portion 52 and the first mating portion. The driven gear tooth portion 52 is engaged with the driving gear tooth portion 42 so that the driven gear 5 can be driven to rotate when the driving gear 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 proximal 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 invention can flexibly adjust the swinging direction and swinging angle of the nail head 9 by controlling the rotating angle of the driving wheel 4 through the gear cooperation of the driving wheel 4 and the driven wheel 5.

In this embodiment, two swing links 6 are provided corresponding to the two swing tabs 8, the two swing links 6 being symmetrically disposed with respect to the axial direction of the stapler. When the driving wheel 4 rotates, the movement directions of the two swing pull rods 6 are opposite. And two driven wheels 5 are correspondingly provided, the two driven wheels 5 being located on the proximal 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 casing 3 and the second casing 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 through the gear engagement of the driving gear tooth part 42 and the driven gear tooth part 52. Through the cooperation of the first cooperation portion and the second cooperation portion, the rotation motion of the driven wheel 5 is converted into the axial motion of the swing pull rod 6, and the swing pull rod 6 drives the swing pull piece 8 to move along the axial direction, so that the swing of the nail head 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 a containing 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 a third passage 20 therein for passing through the sleeve 11. The first inner surface is the inner surface of the first housing 3, and the second inner surface is the inner surface of the second housing 2. The fixing piece 7 is located between the gear set and the inner surface of the first casing 3, the gear set is fixed on the inner surface of the first casing 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 maintained, the unstable position of the nail head 9 caused by the unstable 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 of the mount 7 and the second inner surface. The swing pull rod 6 is arranged between the third surface and the first inner surface of the fixing piece 7, 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 matching portion is an eccentric wheel portion 53, and the second matching portion is an eccentric wheel matching portion 61, and is matched with the eccentric wheel portion 53, so that when the driven wheel 5 rotates, the pull tab matching portion 63 of the swing pull rod 6 is driven to move along the axial direction of the anastomat, and the rotation motion of the driven wheel 5 is converted into the axial motion of the swing pull rod 6. In this embodiment, the outer contour of the eccentric portion 53 is circular or circular arc-shaped. In other embodiments, the outer profile of the eccentric 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 portion 53 is disposed eccentrically with respect to the driven wheel rotation shaft 51, that is, the center of the driven wheel rotation shaft 51 is spaced apart from the center axis O1 of the eccentric portion 53 by a first distance d1. A third mating hole is formed in the eccentric wheel mating portion 61 of the swing rod 6, and the eccentric wheel portion 53 at least partially enters the third mating hole. In a further alternative embodiment, a mating groove can also be provided in the eccentric mating portion 61 of the oscillating bar 6, into which the eccentric 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 guiding groove 33, the guiding groove 33 extends along the axial direction of the anastomat, the swing pull rod 6 further comprises a guiding part 62, the guiding part 62 is positioned in the guiding groove 33, and is limited by the guiding groove 33 to only move axially, when the driving wheel 4 rotates, the swing pull rod 6 is ensured to move axially and not to swing transversely. Specifically, in this embodiment, the swing link 6 includes two guide portions 62, the two guide portions 62 are respectively located on the distal end side and the proximal end side of the eccentric wheel fitting portion 61, and the guide portions 62 are in a bar shape extending in the axial direction of the stapler.

As shown in fig. 5, the tab engaging portion 63 is a protruding portion provided on the inner side of the eccentric wheel engaging portion 61, a hole engaged with the protruding portion is provided on the proximal end side of the swing tab 8, and the protruding portion is fitted into the hole on the proximal end side of the swing tab 8. Each side of the protruding portion is preferably a right-angle surface, so that the protruding portion and the swing pull piece 8 are matched with each other in stability, and accidental slipping of the protruding portion and the swing pull piece is avoided. Preferably, the protruding portion is disposed at a central position of the swing pull rod 6 along an axial direction, that is, a distance from a center of the protruding portion to a distal end of the swing pull rod 6 is equal to a distance from a center of the protruding portion to a proximal end of the swing pull rod 6, and when the swing pull rod 6 pulls the swing pull piece 8 to axially move, lateral deflection of the swing pull rod 6 caused by external force is further avoided. In another alternative embodiment, the tab engaging portion 63 may be a groove provided on the inner side of the cam engaging portion 61, the proximal end side of the swing tab 8 is provided with a protruding portion engaged with the groove, the protruding portion is fitted in the groove, and the groove is preferably provided at the center position of the swing link 6 in the axial direction. In this embodiment, the inner side of the eccentric wheel matching part 61 is a plane parallel to the axial direction of the anastomat, so that the sheet-shaped structure of the swing pull tab 8 can be better adapted.

The principle of the swing operation of the swing mechanism of this embodiment will be specifically described with reference to fig. 9 to 11.

As shown in fig. 9, in the transverse direction of the anastomat, the two guiding portions 62 are respectively connected to the middle portions of the distal end face and the proximal end face of the eccentric wheel matching portion 61, so that the limiting action of the guiding groove 33 on the guiding portions 62 can act on each position of the swing rod 6 more evenly, and further, the swing rod 6 is kept from deflecting transversely due to the rotation movement of the eccentric wheel portion 53 during the movement. The third mating hole of the eccentric wheel mating portion 61 is a kidney-shaped hole 611 including two arcuate sides and two straight sides, the radius of the arcuate sides is equal to the radius of the eccentric wheel portion 53, and the two straight sides of the kidney-shaped hole 611 extend in the transverse direction of the stapler. In another alternative embodiment, the kidney-shaped hole 611 may have a shape different from that shown in fig. 9, so long as the eccentric portion 53 is driven to push the eccentric engaging portion 61 to move in the axial direction when the eccentric portion 53 is rotated. Fig. 9 shows the engagement structure of the driving wheel 4, the driven wheel 5 and the oscillating bar 6 in the initial state. In the initial state, the central axes O1 of the eccentric wheel portions 53 of the driven wheels 5 are located outside the corresponding driven wheel rotation shafts 51. Thus, when the driving wheel 4 drives the driven wheels 5 to rotate, the two driven wheels 5 can drive the two swing links 6 to move in opposite directions. In another alternative embodiment, in the initial state, the central axes of the eccentric portions 53 of the driven wheels 5 may be located inside the corresponding driven wheel rotation shafts 51.

As shown in fig. 10, in the initial state, when the driving wheel 4 is operated to rotate 15 ° in the R3 direction, the driving wheel 4 drives the driven wheel 5 to rotate in the R4 direction by an angle (the angle depends on the gear ratio of the driving wheel 4 and the driven wheel 5). The upper swing rod 6 shown in fig. 10 moves in the W1 direction, i.e., in the distal direction, as compared to fig. 9, and the lower swing rod 6 moves in the W2 direction, i.e., in the proximal direction, as compared to fig. 9, so that the stud 9 can swing in the R1 direction as shown in fig. 2.

As shown in fig. 11, in the initial state, when the driving wheel 4 is operated to rotate 30 ° in the R5 direction, the driving wheel 4 drives the driven wheel 5 to rotate in the R6 direction by an angle (the angle depends on the gear ratio of the driving wheel 4 and the driven wheel 5). The upper swing rod 6 shown in fig. 11 moves in the W3 direction, i.e., moves in the proximal direction, as compared to fig. 9, and the lower swing rod 6 moves in the W4 direction, i.e., moves in the distal direction, as compared to fig. 9, so that the stud 9 can swing in the R2 direction shown in fig. 2. As can be seen by comparing fig. 10 and 11, when the driving wheel 4 is rotated in different directions, it is possible to realize different directions of rotation of the staple heads 9. When the rotation angles of the driving wheels 4 are different, the movement displacement of the swing head pull rod 6 is different, so that the swing angles of the nail head 9 are also different. The larger the rotation angle of the driving wheel 4 is, the larger the movement displacement of the swing head pull rod 6 is, and the larger the swing angle of the nail head 9 is, so that the swing direction and the swing angle of the nail head 9 can be flexibly controlled.

The structural relationship between the fixing member 7 and the other respective components of the present invention will be specifically described 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 74 and two driven wheel support 75. The driving wheel support 74 is located between the driving wheel 4 and the inner surface of the first housing 3, and the driven wheel support 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 75 and the inner surface of the first housing 3. The driving wheel supporting portion 74 is provided with a yielding groove 741 towards one side of the inner surface of the first housing 3, as shown in fig. 17, a sleeve limiting portion 35 is disposed at a position corresponding to the yielding groove 741 on the inner surface of the first housing 3, the yielding groove 741 and the sleeve limiting portion 35 enclose into a first channel 30 extending axially, and a sleeve 11 sleeved outside the swing pull piece 8 passes through the first channel 30. The surface of the relief groove 741 is preferably an arc surface, and the surface of the sleeve stopper 35 is also preferably an arc surface, so that the first channel 30 is a cylindrical channel formed by surrounding, and thus, the first channel is better matched with the outer side surface of the cylindrical sleeve 11, and can also well support the sleeve 11. As shown in fig. 12, an axially extending second channel 79 is formed between the two driven wheel supports 75 to provide a second channel 79 for the proximal end of the sleeve 11 to pass through.

As shown in fig. 12 and 13, the driven wheel supporting portion 75 of the fixing 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 engagement portion 61 of the swing link 6. Thus, in this embodiment, the driving gear tooth portion 42 of the driving gear 4 and the driven gear tooth portion 52 of the driven gear 5 are disposed between the fourth surface of the fixing member 7 and the second inner surface of the housing, and the eccentric gear portion 53 is engaged with the swing link 6 after passing through the through hole 751 of the fixing member 7, since the swing link 6 is located between the third surface of the fixing member 7 and the first inner surface of the housing. As shown in fig. 13 and 14, the axial length of the through hole 751 of the driven wheel supporting part 75 is greater than the radius of the eccentric wheel part 53 and greater than the axial length of the kidney-shaped hole 611 of the eccentric wheel fitting part 61, and the through hole 751 can provide a sufficient space for the eccentric rotation of the eccentric wheel part 53 and the axial movement of the eccentric wheel fitting part 61 when the eccentric wheel part 53 rotates. The guide portion 62 abuts against the distal end side wall and the proximal end side wall of the through hole 751 of the driven pulley support portion 75 in the longitudinal direction to maintain a relatively stable positional relationship between the fixing piece 7 and the swing link 6.

As shown in fig. 7 and 13, a first fixing portion 71 is disposed on a side of the driving wheel support 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 post disposed on the driving wheel supporting portion 74 and protruding toward the driving wheel 4, the second fixing portion 43 is a cylindrical groove formed on a side facing the fixing member 7, the groove is disposed coaxially with the driving wheel 4, and the first fixing post at least partially enters the groove, 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 a side of the driving wheel support portion 74 facing the driving wheel 4, and the second fixing portion may be a first fixing column disposed on the driving wheel 4 protruding toward the fixing member, the first fixing column and the driving wheel 4 are coaxially disposed, and the first fixing column at least partially 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, a first end 511 and a 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 gear tooth portion 52 and the eccentric wheel portion 53 may be rotatably fixed around the driven gear rotation shaft 51 to the second fixing hole 22 and the first fixing hole 32, the driven gear tooth portion 52 and the eccentric wheel portion 53 may be rotatable with respect to the driven gear rotation shaft 51, the driven gear rotation shaft 51 may be rotatably fitted into the second fixing hole 22 and the first fixing hole 32, the driving gear tooth portion 42 and the eccentric wheel portion 53 may be non-rotatably fitted around the driven gear rotation shaft 51, and the driving gear tooth portion 42 and the eccentric wheel portion 53 may be rotatable around the axis of the driven gear rotation shaft 51 together with the driven gear rotation shaft 51. The third channel 20, which is shown in fig. 15 and 17, is part of a third channel, and the first housing 2 and the second housing 3 are combined to form a complete third channel 20.

As shown in fig. 15 and 16, the surface of the second housing 2 is provided with a receiving hole 21, and the knob 41 is exposed to the outside of the second housing 2 through the receiving hole 21. The fixing element 7 at least partially enters the receiving space of the second housing 2. The inner surface of the second housing 2 is provided with at least one limiting member 23, the limiting member 23 is distributed on the outer side of the driven wheel supporting portion 75, and the limiting member 23 limits 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 driving wheel 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 an embedded connection. In this embodiment, the third fixing portion 72 is a second fixing post 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 mating hole is formed in the center of the first supporting seat, and the second fixing post at least partially enters the first mating hole. The third fixing portion 72 and the fourth fixing portion 31 form a non-relatively rotatable connection, for example, an interference fit may be formed between the third fixing portion 72 and the fourth fixing portion 31. Further, since the driving wheel supporting portion 74 is provided with two third fixing portions 72 arranged in a lateral direction, and the first housing 3 is provided with two fourth fixing portions 31 arranged in a lateral direction, the third fixing portions 72 and the fourth fixing portions 31 may be further prevented from rotating. In another alternative embodiment, the third fixing portion 72 may include a first mating hole, and the fourth fixing portion 31 may be a fixing post protruding toward the driving wheel supporting portion 74, or a fixing hole corresponding to the second fixing post may be directly provided on the inner surface of the first housing 3. In a preferred embodiment, the third fixing portion 72 is a non-circular cross section, and the fourth fixing portion 31 is a fixing hole with a non-circular cross section, for example: triangular or polygonal cross-section to prevent rotational movement of the mount 7 relative to the housing.

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

The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the invention, and these should be considered to be within the scope of the invention.

Claims (23)

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

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 head pull rod comprises a second matching part and a pull piece matching part, the pull piece matching part is connected with the swing head 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 head 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 defined between the first inner surface and the second inner surface;

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

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

3. The swing mechanism according to claim 1, wherein the securing 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 inner surface of the housing, the driven wheel support portion being located between the driven wheel and the first inner surface of the housing.

4. The swing mechanism according to claim 3, wherein a first fixing portion is provided on a side of the driving wheel supporting portion facing the driving wheel, a second fixing portion is provided 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 with respect to the first fixing portion.

5. The swing mechanism according to claim 4, wherein the drive wheel further comprises an operation portion and a driving gear tooth portion, the operation portion is provided on a side of the driving gear tooth portion facing the second inner surface of the housing, and the first fixing portion is provided on a side of the driving gear 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 of the driven wheel tooth part facing the first inner surface;

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

6. The swing mechanism according to claim 4, wherein the first fixing portion is a first fixing post provided on the driving wheel supporting portion and protruding toward the driving wheel, the second fixing portion is a groove provided on a side of the driving wheel facing the fixing member, the groove and the driving wheel are coaxially arranged, and the first fixing post at least partially enters the groove; or alternatively, the first and second heat exchangers may be,

the first fixing part is a groove arranged on one side of the driving wheel supporting part, which faces the driving wheel, the second fixing part is a first fixing column arranged on the first fixing column, which faces the fixing piece, and protrudes out, 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 swing mechanism according to claim 3, wherein a third fixing portion is provided on a side of the drive wheel supporting portion facing the first inner surface of the housing, a fourth fixing portion is provided 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 number of the groups of groups,

A fifth fixing part is arranged on one side, facing the first inner surface of the shell, of the driven wheel supporting part, a sixth fixing part is arranged on the first inner surface of the shell, and the fifth fixing part and the sixth fixing part are connected in an embedded mode.

8. The swing 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 provided on the first inner surface of the housing, a first fitting hole is provided in the center of the first supporting seat, the second fixing post at least partially enters the first fitting hole, or the third fixing portion includes a first fitting hole, the fourth fixing portion is a second fixing post provided on the housing toward the driving wheel supporting portion, and the second fixing post 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, the third fixing column at least partially enters the second matching hole, or the fifth fixing portion comprises a second matching hole, the sixth fixing portion is a third fixing column arranged on the shell and facing the driven wheel supporting portion, and the third fixing column at least partially enters the second matching hole.

9. The swing mechanism according to claim 3, wherein a relief groove is provided on a side of the drive wheel supporting portion facing the first inner surface of the housing, a sleeve limiting portion is provided at a position of the housing opposite to the relief groove, and the relief groove and the sleeve limiting portion enclose a first channel along an axial direction.

10. The swing mechanism according to claim 9, wherein the surface of the relief groove and the surface of the sleeve retainer are both arcuate surfaces, and the first channel is a cylindrical channel.

11. The swing mechanism according to claim 3, wherein the gear set comprises two driven wheels, the swing mechanism comprises 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 along the axial direction, and the movement directions of the two swing pull rods are opposite;

the fixing piece comprises two driven wheel supporting parts, and a second channel extending in the axial direction is formed between the two driven wheel supporting parts.

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

13. The swing mechanism according to claim 11, wherein the driven pulley further comprises a driven pulley rotational axis, the driven pulley is located at a proximal end of the drive pulley, the driven pulley rotational axes of the two driven pulleys are parallel to the central axis of the drive pulley, and the driven pulley rotational axes of the two driven pulleys are equidistant from the central axis of the drive pulley.

14. The swing mechanism according to claim 3, wherein the housing further includes a second inner surface provided with at least one stop limiting axial movement of the driven wheel support.

15. A swing mechanism according to claim 3, wherein the swing rod is located between the third surface of the fixing member and the first inner surface of the housing, the driven wheel support portion of the fixing member is provided with a through hole, and the first engagement portion of the driven wheel passes through the through hole and then engages with the second engagement portion of the swing rod.

16. The swing mechanism according to claim 15, wherein the driven wheel further includes a driven wheel rotation shaft, the first and second inner surfaces of the housing are provided with first and second fixing holes, respectively, and both ends of the driven wheel rotation shaft enter the first and second fixing holes, respectively, and the driven wheel is rotatable about the driven wheel rotation shaft.

17. The swing mechanism according to claim 16, wherein the first mating portion is an eccentric portion, a center of the driven wheel rotating shaft is a first distance from a center axis of the eccentric portion, the second mating portion is an eccentric mating portion, a mating groove or a third mating hole is formed in the eccentric mating portion, the eccentric portion at least partially enters the mating groove or the third mating hole, and the eccentric is mated with the mating groove or the third mating hole to drive the swing rod to move in an axial direction.

18. The swing mechanism according to claim 17, wherein the outer profile of the eccentric portion is circular or circular arc, and the mating groove of the eccentric mating portion or the third mating hole is a kidney-shaped groove or a kidney-shaped hole.

19. The swing mechanism according to claim 17, wherein the mating groove of the eccentric mating portion or the third mating hole is kidney-shaped including two arcuate sides and two straight sides, the arcuate sides having a radius equal to the radius of the eccentric portion.

20. The swing mechanism according to claim 17, wherein the axial length of the through hole of the driven wheel support portion is greater than the radius of the eccentric wheel portion and greater than the axial length of the mating groove or the third mating hole of the eccentric wheel mating portion.

21. The swing mechanism according to claim 20, wherein the eccentric wheel engaging portion is provided with a guide portion on a distal end side and a proximal end side thereof, respectively, the guide portion being abutted against a distal end side wall and a proximal end side wall of the through hole of the driven wheel supporting portion in a longitudinal direction;

the first inner surface of the housing is provided with a guide groove extending in the axial direction of the stapler, the guide portion being located in the guide groove and being limited by the guide groove to only axial movement.

22. The swing mechanism according to claim 17, wherein the gear train includes two driven wheels, the swing mechanism includes two swing links and two swing tabs, and in an initial state, central axes of eccentric wheel portions of the two driven wheels are located outside corresponding driven wheel rotation axes, or in an initial state, central axes of eccentric wheel portions of the two driven wheels are located inside corresponding driven wheel rotation axes.

23. A medical stapler comprising the swing mechanism of any one of claims 1 to 22.

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