CN216854749U

CN216854749U - Head swinging mechanism and medical anastomat

Info

Publication number: CN216854749U
Application number: CN202122888036.6U
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: a drive wheel including a drive wheel tooth portion; the driven wheel comprises a driven wheel tooth part and a first matching part, and the driven wheel tooth part is meshed with the driving wheel tooth part; the swing pull rod comprises a second matching part and a pull piece matching part, 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; and the swinging pull rod extends along the axial direction of the anastomat and is connected to the pull piece matching part of the swinging pull rod. The utility model can simply and conveniently realize the swing of the nail head of the anastomat relative to the anastomat body.

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 can adjust the swinging angle of the nail head through the matching of gears.

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

a drive wheel including a drive wheel tooth portion;

the driven wheel comprises a driven wheel tooth part and a first matching part, and the driven wheel tooth part is meshed with the driving wheel tooth part;

the swing pull rod comprises a second matching part and a pull piece matching part, 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;

and the swinging pull piece extends along the axial direction of the anastomat and is connected to the pull piece matching part of the swinging pull rod.

In some embodiments, the device further comprises a housing, and the housing comprises a containing cavity for containing the driving wheel and the driven wheel.

In some embodiments, the first inner surface of the housing is provided with a supporting portion protruding from the first inner surface, and one side of the driving wheel facing the first inner surface of the housing is provided with a sliding groove; or, a sliding groove is formed in the first inner surface of the shell, and a supporting part is arranged on one side, facing the first inner surface of the shell, of the driving wheel;

the support portion is located in the slide groove, and the support portion is rotatable relative to the slide groove.

In some embodiments, the support portion is an annular support portion or an arc-shaped support portion, the sliding groove is an annular sliding groove or an arc-shaped sliding groove, and the sliding groove is coaxially arranged with the driving gear teeth portion.

In some embodiments, the driven wheel further comprises a third mating portion, and the inner surface of the housing is provided with a fourth mating portion, and the third mating portion is mated with the fourth mating portion so that the driven wheel rotates relative to the housing.

In some embodiments, the third mating portion includes a driven wheel rotation shaft, and the fourth mating portion includes a fixing hole; or, the third matching part comprises a fixing hole, and the fourth matching part comprises a driven wheel rotating shaft;

the driven wheel rotating shaft is at least partially located in the fixed hole, and the driven wheel rotating shaft is rotatable relative to the fixed hole.

In some embodiments, the first mating portion is located on a side of the driven wheel tooth portion facing the first inner surface of the housing.

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 matching hole is formed in the eccentric wheel matching portion, the eccentric wheel portion at least partially enters the matching groove or the matching hole, and the eccentric wheel portion matches with the matching groove or the 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 or the fitting hole of the eccentric wheel fitting portion is a kidney-shaped groove or a kidney-shaped hole.

In some embodiments, the fitting groove or the fitting hole of the eccentric wheel fitting portion is kidney-shaped 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, two straight edges of the fitting groove or the fitting hole extend in a transverse direction of the stapler.

In some embodiments, the stapler comprises two driven wheels, two swinging pull rods and two swinging pull pieces, the two driven wheels are symmetrically arranged relative to the axis of the stapler, the two swinging pull rods are symmetrically arranged relative to the axial direction of the stapler, each swinging pull rod is connected with one swinging pull piece, and when the driving wheel rotates, the moving directions of the two swinging pull rods are opposite.

In some embodiments, in the initial state, the central axes of the eccentric portions of the two driven wheels are both located outside the corresponding driven wheel rotation axis, or in the initial state, the central axes of the eccentric portions of the two driven wheels are both located inside the corresponding driven wheel rotation axis.

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 protrusion or the groove is disposed at a center position of the swing rod in the axial direction.

In some embodiments, the inner side surface of the second fitting portion is a plane parallel to the axial direction of the stapler.

In some embodiments, the driven wheel is located at a proximal end of the drive wheel.

In some embodiments, 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 first inner surface of the housing is provided with a guide groove extending in an axial direction of the stapler, and the swing link further includes a guide portion located in the guide groove and limited by the guide groove to move only in the axial direction.

In some embodiments, the swing pull rod comprises two guide portions, the two guide portions are respectively located at the far end side and the near end side of the second matching portion, and the guide portions are strip-shaped and extend along the axial direction of the anastomat; in the transverse direction of the stapler, the two guide portions are connected to the middle of the distal end face and the proximal end face of the second fitting portion, respectively.

In some embodiments, the driving wheel further includes an operating portion, the second side surface of the casing is provided with a receiving hole, and the operating portion passes through the receiving hole and is exposed outside the casing.

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 driven wheel is matched with the swing pull rod to convert the rotary motion into the axial motion, and the swing pull piece is driven by the swing pull rod to move along the axial direction, so that the swing of the nail head of the anastomat relative to the anastomat body can be simply and conveniently realized, and 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.

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 diagram of a stapler according to an embodiment of the utility model;

FIG. 2 is a schematic view of the structure of the engagement of the stud portion and the swing tab of an embodiment of the present invention;

FIG. 3 is a schematic view of the structure of the head swing mechanism and the sleeve according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a head swing mechanism according to an embodiment of the present invention;

FIG. 5 is a top view of a yaw mechanism according to an embodiment of the present invention;

FIG. 6 is a sectional view taken in the direction A1-A1 of FIG. 5;

FIG. 7 is a schematic structural diagram of a second housing according to an embodiment of the utility model;

FIGS. 8 and 9 are exploded views of the yaw mechanism with the second housing removed in accordance with one embodiment of the present invention;

FIG. 10 is a schematic structural diagram of a first housing according to an embodiment of the utility model;

FIG. 11 is a schematic view of the configuration of the swing link and swing tab of one embodiment of the present invention;

FIG. 12 is an exploded view of the yaw tie rod and driven wheel combination of one embodiment of the present invention;

FIGS. 13 and 14 are schematic views of the head swing mechanism according to an embodiment of the present invention controlling the swinging of the head in the direction R1;

fig. 15 and 16 are schematic diagrams of the head swing mechanism according to an embodiment of the present invention when controlling the head to swing in the direction R2.

Reference numerals:

11 driven wheel of anastomat body 5

111 sleeve 51 driven wheel rotation shaft

112 fixed handle 511 a first end of a rotation shaft of a driven wheel

12 firing handle 512 from the second end of the wheel rotation shaft

20 sleeve channel 52 driven wheel tooth

2 second housing 53 eccentric wheel portion

21 receiving hole 6 swing head pull rod

22 second fixing hole 61 eccentric wheel matching part

3 first shell 611 waist-shaped hole

31 support part 62 guide part

32 first fixing hole 63 pull tab mating part

33 guide groove 8 swing pull tab

4 driving wheel 9 nail head

41 knob 91 anvil

42 drive sprocket part 92 nail bin assembly

43 chute 93 connecting piece

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 their repetitive description will be omitted.

The utility model provides a head swinging mechanism and a medical anastomat comprising the same. The swing mechanism comprises a driving wheel, a driven wheel, a swing pull rod and a swing pull piece, the driving wheel comprises a driving wheel tooth part, the driven wheel comprises a driven wheel tooth part and a first matching part, and the driven wheel tooth part is meshed with the driving wheel tooth part. Therefore, when the operator controls the rotation of the driving wheel, the driven wheel can be driven to rotate by the gear engagement of the driving wheel tooth portion and the driven wheel tooth portion.

The swing pull rod comprises a second matching part and a pull piece matching part, and the swing pull piece extends along the axial direction of the anastomat and is connected to the pull piece matching part of the swing pull rod. 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 axially along the anastomat, the rotating motion of the driven wheel is converted into the axial motion of the swing pull rod, the swing pull piece is driven to move axially through the swing pull rod, and therefore the nail head part of the anastomat can swing relative to the anastomat body simply and conveniently. Furthermore, the swing direction and the swing angle of the nail head can be flexibly adjusted by controlling the rotation angle of the driving wheel through the matching of the gears of the driving wheel and the driven wheel.

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.

As shown in fig. 1 to 2, the present invention provides a head swing mechanism and a medical stapler including the same, wherein the medical stapler includes a nail head 9, a stapler body 11, a firing handle 12 pivotally connected to the stapler body 11, and a head swing mechanism disposed between the nail head 9 and the stapler body 11. The stapler body 11 includes a body housing, a fixing handle 112, and a sleeve 111, and a distal end side of the sleeve 111 is connected to the nail head 9. The nail head 9 comprises an anvil 91 and a cartridge assembly 92 which are oppositely arranged, and a connecting piece 93 which is positioned at the proximal end side of the anvil 91 and the cartridge assembly 92. The swing head mechanism comprises two swing head pull tabs 8, the swing head pull tabs 8 are at least partially positioned inside the sleeve 111, and the sleeve 111 is omitted in fig. 2 to show the matching of the swing head pull tabs 8 and the nail head 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. 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. The swing tab 8 located above moves in the distal direction, and when 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 swing head mechanism further includes a housing, a driving wheel 4 and a driven wheel 5, and the driving wheel 4 and the driven wheel 5 form a gear set. The driving wheel 4 and the driven wheel 5 are accommodated in an accommodating cavity in the housing. The head swinging pull rod 6 is also positioned in the accommodating cavity. In the perspective of fig. 6, the housing comprises a first housing 3 located below and a second housing 2 located above. The interior of the second housing 2 and the first housing 3 together define a sleeve passage 20 which accommodates part of the sleeve 111. The inner surface of the first housing 3 is a first inner surface of the housing and the inner surface of the second housing 2 is a second inner surface of the housing. The driving wheel 4 comprises an operating part and a driving wheel tooth part 42, and a first tooth surface is at least partially arranged on the side wall of the driving wheel tooth part 42. In this embodiment, the operation portion is a knob 41 for facilitating manual operation by an operator. 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 52, and a side wall of the driven wheel tooth 52 is at least partially provided with a second tooth surface, and the first tooth surface is meshed with the second tooth surface. Therefore, when the operator controls the driving wheel 4 to rotate through the knob 41, the driven wheel 5 can be driven to rotate through the meshing of the gears at the first tooth surface and the second tooth surface. In this embodiment, two of the driven wheels 5 are provided, and the two driven wheels 5 are located on 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.

As shown in fig. 7 to 10, the driven gear tooth portion 52 of the driven gear 5 is further provided with a first engaging portion on a side facing the first housing 3, in this embodiment, the first engaging portion is an eccentric gear portion 53, and an outer contour of the eccentric gear 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 head swing mechanism further comprises a head swing pull rod 6 accommodated in the housing. In this embodiment, the stapler comprises two swing pull rods 6 corresponding to the driven wheels 5 one by one, the two swing pull rods 6 are arranged symmetrically with respect to the axial direction of the stapler, each swing pull rod 6 is connected with one swing pull piece 8, and when the driving wheel 4 rotates, the moving directions of the two swing pull rods 6 are opposite. The swing head pull rod 6 comprises a second matching part and a pull piece matching part 63, and the pull piece matching part 63 of the swing head pull rod 6 is connected with the near end side of the swing head pull piece 8. In this embodiment, 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 rod 6 is driven to move along the axial direction of the stapler, and the rotation motion of the driven wheel 5 is converted into the axial motion of the swing rod 6. When an operator operates the driving wheel 4 to rotate through the knob 41, the driving wheel 4 drives the driven wheel 5 to rotate through the meshing of the first tooth surface and the second tooth surface, the driven wheel 5 rotates to drive the swing pull rod 6 to move along the axial direction of the anastomat, and therefore the swing pull piece 8 can be driven to move along the axial direction through the swing pull rod 6, and therefore the swing of the nail head part 9 of the anastomat relative to the anastomat body 11 can be achieved simply and conveniently. In addition, 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 gear matching of the driving wheel 4 and the driven wheel 5.

As shown in fig. 7 to 10, the surface of the second housing 2 is provided with a receiving hole 21, and the knob 41 passes through the receiving hole and is exposed outside the second housing 2. The inner surface of the first housing 3 is provided with a supporting portion 31 protruding from the first inner surface, one side of the driving wheel 4 facing the inner surface of the first housing 3 is provided with a sliding slot 43, the supporting portion 31 is located in the sliding slot 43, and the driving wheel 4 can rotate relative to the supporting portion 31. As shown in fig. 10, the support portion 31 is an arc-shaped support portion 31, the sliding slot 43 is an annular sliding slot 43, and the arc-shaped support portion 31 and the annular sliding slot 43 are coaxially arranged and matched in size. The sliding groove 43 is coaxially arranged with the driving gear tooth portion 42, and the diameter of the sliding groove 43 is smaller than the outer diameter of the driving gear tooth portion 42. Through the cooperation of the supporting portion 31 and the sliding groove 43, the central shaft of the driving wheel 4 can be ensured not to displace in the axial direction and the transverse direction of the anastomat. In another alternative embodiment, the support portion may also be an annular support portion, which is coaxially disposed and sized to the annular sliding groove. In yet another alternative embodiment, the support portion is an arc-shaped support portion, the sliding slot may also be an arc-shaped sliding slot, and the arc length of the sliding slot is greater than the arc length of the support portion, so that the support portion may have a circumferential rotation space in the sliding slot. In yet another alternative embodiment, a sliding groove may be provided on the inner surface of the first housing 3, and a support portion may be provided on the side of the driving wheel 4 facing the inner surface of the first housing 3, the support portion being located in the sliding groove and being rotatable relative to the sliding groove, such that the driving wheel 4 is rotatable relative to the first housing 3.

As shown in fig. 7 to 10, in this embodiment, the driven wheel 5 further includes a driven wheel rotating shaft 51, the inner surface of the second housing 2 and the inner surface of the first housing 3 are provided with a second fixing hole 22 and a first fixing hole 32, respectively, and a first end 511 and a second end 512 of the driven wheel rotating shaft 51 enter the second fixing hole 22 and the first fixing hole 32, respectively. The driven wheel rotation shaft 51 is inserted into the driven wheel tooth portion 52 and the eccentric wheel portion 53, and the driven wheel tooth portion 52 and the eccentric wheel portion 53 are rotatable around 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.

As shown in fig. 9 and 10, the first inner surface of the housing 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. 11 and 12, 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 (as shown in fig. 13). A 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 matching hole. In another alternative embodiment, the eccentric wheel fitting portion 61 of the drag link 6 may also have a fitting groove, the eccentric wheel portion 53 at least partially enters the fitting groove, and the eccentric wheel portion 53 is fitted with the fitting groove or the fitting hole to drive the drag link 6 to move in the axial direction.

As shown in fig. 11 and 12, the swing pull-tab fitting portion 63 is a protrusion portion provided on the inner side of the eccentric wheel fitting portion 61, and a hole fitted with the protrusion portion is provided on the proximal end side of the swing pull-tab 8, and the protrusion portion is embedded in the hole on the proximal end side of the swing pull-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 swing tab engaging portion 63 may also be a groove provided on the inner side of the eccentric wheel engaging portion 61, the proximal end side of the swing tab 8 is provided with a protrusion engaged with the groove, the protrusion is embedded in the groove, and the groove is preferably provided at the center position of the swing pull 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.

As shown in fig. 13, 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 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 matching hole of the eccentric wheel matching part 61 is a waist-shaped hole 611 comprising 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. 13, 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. 13 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. 13, when the primary pulley 4 is operated to rotate in the R3 direction in the initial state, the primary pulley 4 drives the secondary pulley 5 to rotate in the R4 direction, and then the state in fig. 14 is entered. Fig. 14 shows a state in which the capstan 4 is rotated 15 ° in the direction of R3 in the state of fig. 13. The upper swing link 6 shown in fig. 14 moves in the direction W1, i.e., in the distal side direction, as compared with fig. 13, and the lower swing link 6 moves in the direction W2, i.e., in the proximal side direction, as compared with fig. 13, so that the nail head 9 can swing in the direction R1 as shown in fig. 2.

As shown in fig. 15, when the primary pulley 4 is operated to rotate in the R5 direction in the initial state, the primary pulley 4 drives the secondary pulley 5 to rotate in the R6 direction, and the state in fig. 16 is entered. Fig. 16 shows a state in which the capstan 4 is rotated 30 ° in the direction of R5 in the state of fig. 15. The upper swing link 6 shown in fig. 16 moves in the direction W3, i.e., in the proximal direction, as compared to fig. 15, and the lower swing link 6 moves in the direction W4, i.e., in the distal direction, as compared to fig. 15, so that the head 9 can swing in the direction R2 shown in fig. 2. As can be seen by comparing fig. 14 and 16, 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 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:

a drive wheel including a drive wheel tooth portion;

2. The yaw mechanism of claim 1, further comprising a housing including a receiving cavity that receives the drive wheel and the driven wheel.

3. The head swinging mechanism according to claim 2, wherein the first inner surface of the housing is provided with a supporting portion protruding from the first inner surface, and one side of the driving wheel facing the first inner surface of the housing is provided with a sliding groove; or, a sliding groove is formed in the first inner surface of the shell, and a supporting part is arranged on one side, facing the first inner surface of the shell, of the driving wheel;

4. The head oscillating mechanism according to claim 3, wherein the support portion is an annular support portion or an arc-shaped support portion, the sliding slot is an annular sliding slot or an arc-shaped sliding slot, and the sliding slot is coaxially arranged with the driving gear portion.

5. The yaw mechanism of claim 2, wherein the driven wheel further comprises a third engagement portion, and wherein an inner surface of the housing is provided with a fourth engagement portion, the third engagement portion engaging the fourth engagement portion such that the driven wheel rotates relative to the housing.

6. The yaw mechanism of claim 5, wherein the third engagement portion comprises a driven wheel rotation shaft and the fourth engagement portion comprises a fixing hole; or, the third matching part comprises a fixing hole, and the fourth matching part comprises a driven wheel rotating shaft;

7. The yaw mechanism of claim 6 wherein said first engagement portion is located on a side of said driven wheel tooth portion facing said first inner surface of said housing.

8. The head oscillating mechanism according to claim 6, wherein the first engaging portion is an eccentric wheel portion, the center of the rotation axis of the driven wheel is a first distance from the central axis of the eccentric wheel portion, the second engaging portion is an eccentric wheel engaging portion, an engaging groove or an engaging hole is formed in the eccentric wheel engaging portion, the eccentric wheel portion at least partially enters the engaging groove or the engaging hole, and the eccentric wheel portion engages with the engaging groove or the engaging hole to drive the head oscillating rod to move axially.

9. The yaw mechanism of claim 8, wherein the outer contour of the eccentric wheel portion is circular or arc-shaped, and the fitting groove or the fitting hole of the eccentric wheel fitting portion is a kidney-shaped groove or a kidney-shaped hole.

10. The yaw mechanism of claim 9, wherein the fitting groove or the fitting hole of the eccentric wheel fitting portion is kidney-shaped 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.

11. The yaw mechanism of claim 10, wherein two straight edges of the engagement slot or the engagement hole extend in a lateral direction of the stapler.

12. The head swinging mechanism according to claim 8, comprising two driven wheels, two head swinging pull rods and two head swinging pull pieces, wherein the two driven wheels are symmetrically arranged relative to the axis of the anastomat, the two head swinging pull rods are symmetrically arranged relative to the axial direction of the anastomat, each head swinging pull rod is respectively connected with one head swinging pull piece, and when the driving wheel rotates, the two head swinging pull rods move in opposite directions.

13. The yaw mechanism of claim 12, wherein the central axes of the eccentric portions of the two driven wheels are both located outside the corresponding driven wheel rotation axis in an initial state, or the central axes of the eccentric portions of the two driven wheels are both located inside the corresponding driven wheel rotation axis in an initial state.

14. The yaw mechanism of claim 12, wherein the yaw pull-tab engagement portion is a protrusion disposed on an inner side of the second engagement portion, and a proximal side of the yaw pull-tab is provided with a hole engaged with the protrusion, or the yaw pull-tab engagement portion is a groove disposed on an inner side of the second engagement portion, and a proximal side of the yaw pull-tab is provided with a protrusion engaged with the groove.

15. The yaw mechanism of claim 14, wherein the boss or the recess is provided at a central position of the yaw rod in an axial direction.

16. The yaw mechanism of claim 14, wherein an inner side surface of the second engagement portion is a plane parallel to an axial direction of the stapler.

17. The yaw mechanism of claim 12, wherein the driven wheel is located at a proximal end of the drive wheel.

18. The yaw mechanism of claim 12, wherein 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.

19. The yaw mechanism of claim 2, wherein the first inner surface of the housing is provided with a guide groove extending in an axial direction of the stapler, and wherein the yaw lever further comprises a guide portion disposed in the guide groove and limited by the guide groove to move only in the axial direction.

20. The yaw mechanism of claim 19, wherein said yaw linkage includes two of said guide portions, said two guide portions being located at a distal end side and a proximal end side of said second fitting portion, respectively, said guide portions being in a strip shape extending in an axial direction of said stapler;

in the transverse direction of the stapler, the two guide portions are connected to the middle of the distal end face and the proximal end face of the second fitting portion, respectively.

21. The head swinging mechanism according to claim 2, wherein the driving wheel further comprises an operating part, the second side surface of the housing is provided with a receiving hole, and the operating part passes through the receiving hole and is exposed out of the housing.

22. A medical stapler, characterized in that it comprises a head swinging mechanism according to any one of claims 1 to 21.