CN217118486U

CN217118486U - Closing switching mechanism and medical anastomat

Info

Publication number: CN217118486U
Application number: CN202123141888.5U
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: 2021-12-14
Filing date: 2021-12-14
Publication date: 2022-08-05
Anticipated expiration: 2031-12-14

Abstract

The utility model provides a closed switching mechanism and medical anastomat, closed switching mechanism includes: a connecting rod extending in an axial direction of the stapler; the closing pull piece is at least partially positioned inside the connecting rod and can axially move relative to the connecting rod, and a first stop part is fixedly arranged on the proximal end side of the closing pull piece; the reset button is located on the proximal end side of the connecting rod, at least part of the reset button enters the connecting rod and can move axially relative to the connecting rod, and when the reset button is driven to move towards the direction of the distal end side of the anastomat, the closing pull sheet is driven to move towards the direction of the distal end side of the anastomat. The utility model discloses can come manual opening pin fin portion through the operation button that resets, avoid appearing closed pulling-on piece and roll back not in place and lead to the condition that the pin fin portion can not normally be opened.

Description

Closing switching mechanism and medical anastomat

Technical Field

The utility model relates to the technical field of medical equipment, concretely relates to closed switching mechanism and medical anastomat.

Background

In the prior art, a medical stapler comprises a stapler body, an operating 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 trigger assembly is driven by the operation 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. Then, the operator holds the firing handle again to push the anastomotic nails to move towards the tissue, the tissue is anastomosed through the formation of the anastomotic nails in the nail bin assembly at the nail anvil, and simultaneously, the cutter moves towards the far end side to cut the tissue, so that the firing of the anastomat is realized. In the existing closing and switching mechanism, the structure is complex, and after the anastomat is fired, the problem that the nail head is difficult to open may occur, which brings inconvenience to the operation of an operator.

The utility model discloses in, distal end side and near-end side are for the operator, and the one end that is nearer apart from the operator is near-end side, and the one end far away apart from the operator, the one end that is more close to the operation position promptly is the distal end 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

To the problem among the prior art, the utility model aims to provide a closed switching mechanism and medical anastomat resets the button through the operation and comes the manual pin fin portion of opening, avoids appearing the closed pulling-on piece and rolls back the condition that leads to the pin fin portion normally to open not in place.

The embodiment of the utility model provides a closed switching mechanism for medical anastomat, closed switching mechanism includes:

a connecting rod extending in an axial direction of the stapler;

the closing pull piece is at least partially positioned inside the connecting rod and can axially move relative to the connecting rod, and a first stop part is fixedly arranged on the proximal end side of the closing pull piece;

the reset button is located on the proximal end side of the connecting rod, at least part of the reset button enters the connecting rod and can move axially relative to the connecting rod, and when the reset button is driven to move towards the direction of the distal end side of the anastomat, the closing pull sheet is driven to move towards the direction of the distal end side of the anastomat.

In some embodiments, the stapler includes a stapler body, the closure switching mechanism further including a second stop located proximally of the first stop and axially fixed to a housing of the stapler body;

the reset button is driven to abut against the first stop portion when moving towards the distal side of the anastomat, and the reset button is driven to abut against the second stop portion when moving towards the proximal side of the anastomat.

In some embodiments, the stapler body is provided with a second stop cooperating portion, and the second stop cooperating portion is rotatably provided on the second stop cooperating portion.

In some embodiments, the second stop portion engaging portion is a circumferential groove disposed in the housing, and the second stop portion is a first connecting pin movably disposed in the reset button, and the first connecting pin is rotatably disposed in the circumferential groove.

In some embodiments, the connector further comprises a ring-shaped fixing member, the first connecting pin is fixedly connected to the fixing member, and the fixing member is rotatably arranged in the circumferential groove.

In some embodiments, the reset button is at least partially accessible to an interior of the fixture, and the reset button is axially movable relative to the fixture.

In some embodiments, the reset button includes a reset mating portion and an operating portion located at a proximal side of the reset mating portion, the operating portion is located at a proximal side of the second stop portion, the second stop portion is disposed through the reset mating portion, and the reset mating portion is movable relative to the second stop portion along an axial direction of the stapler.

In some embodiments, the side surface of the reset fitting portion is provided with a sliding groove extending in the axial direction, and the first connecting pin at least partially enters the sliding groove and can move along the extending direction of the sliding groove.

In some embodiments, the slide slot is not connected to the distal and proximal ends of the reset mating portion.

In some embodiments, a first biasing member is disposed between the reduction fitting and the first connecting pin, and the first biasing member biases the reduction fitting toward a distal side of the stapler.

In some embodiments, the first biasing member is a first return spring, a cavity is formed in the return fitting portion, the first return spring is disposed in the cavity, one end of the first return spring abuts against the far end of the cavity, and the second end of the first return spring abuts against the first connecting pin.

In some embodiments, the first stop is a second connecting pin disposed through a proximal side of the closure tab, the reset mating portion being located on the proximal side of the second connecting pin;

when the reset button is driven to move towards the direction of the far end side of the anastomat, the far end face of the reset matching part is abutted against the second connecting pin, and the closing pull piece is driven to move towards the direction of the far end side of the anastomat.

In some embodiments, the pull tab assembly further includes a closing pull rod assembly, the closing pull rod assembly includes a sleeve portion, the sleeve portion is sleeved outside the connecting rod and can move axially relative to the connecting rod, and the sleeve portion is fixedly connected to the proximal end side of the closing pull tab through the second connecting pin.

In some embodiments, a second biasing member is disposed between the sheath portion and the second stop portion, and the second biasing member biases the sheath portion in a direction toward a distal side of the stapler.

In some embodiments, the closure lever assembly further comprises a drive portion, the closure switching mechanism further comprising:

the connecting rod assembly comprises a first pivoting part and a second pivoting part, the first pivoting part is pivotally connected to the anastomat body, the second pivoting part is located on the near end side of the first pivoting part, the second pivoting part is pivotally connected with the driving part of the closing pull rod assembly, and the connecting rod assembly comprises a first state and a second state;

a firing handle including a first mating portion;

when the connecting rod assembly is in the first state and the firing handle rotates along the first direction, the first matching portion drives the connecting rod assembly to enter the second state, the second pivoting portion of the connecting rod assembly moves towards the direction of the near end side of the anastomat, and the closing pull rod assembly is driven to move towards the direction of the near end side of the anastomat.

In some embodiments, the linkage assembly comprises a first rod and a second rod, the second rod being located on a proximal side of the first rod, the first rod comprising the first pivot and a third pivot, the second rod comprising the second pivot and a fourth pivot, the third pivot pivotally connected to the fourth pivot;

when the connecting rod assembly enters the second state from the first state, the third pivoting portion and the fourth pivoting portion move towards the direction close to the connecting rod.

In some embodiments, the link assembly further includes a driving knob, and the closing and switching mechanism further includes an actuating rod and a switching driving member, the actuating rod is sleeved outside the connecting rod, and the switching driving member is disposed on a side of the actuating rod facing the link assembly;

the switching driving piece moves towards the direction of the near end side of the anastomat and is matched with the driving button, the switching driving piece presses the connecting rod assembly towards the direction away from the connecting rod, the third pivoting portion and the fourth pivoting portion move towards the direction away from the connecting rod, so that the connecting rod assembly enters the first state, and the second pivoting portion drives the closing pull piece to move towards the direction of the far end side of the anastomat.

In some embodiments, the driving knob is rotatably connected to the first rod or the second rod, the link assembly is in the second state, and when the actuating rod moves to the distal direction of the stapler, the switching driving part drives the first end of the driving knob to move to the distal direction without blocking the movement of the actuating rod.

In some embodiments, further comprising:

the switching driving piece drives the closing pull rod assembly to move towards the proximal end side direction of the anastomat when moving towards the proximal end side direction of the anastomat, so that the connecting rod assembly enters the second state from the first state; when the switching driving piece moves towards the direction of the far end side of the anastomat, the connecting rod assembly is driven to enter the first state, and the second pivoting portion drives the closing pull rod assembly to move towards the direction of the far end side of the anastomat.

The embodiment of the utility model provides a still provide a medical anastomat, including foretell closed switching mechanism.

The utility model provides a closed switching mechanism and medical anastomat have following advantage:

the utility model provides a closed switching mechanism for medical anastomat, under the closed state of pin fin portion of anastomat, can drive closed pulling-on piece and roll back to the distal end side through the operation button that resets to come manual supplementary opening pin fin portion, thereby avoid appearing closed pulling-on piece and roll back the condition that not in place leads to the pin fin portion can normally open.

Drawings

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

FIG. 1 is a schematic view of an embodiment of the present invention;

FIG. 2 is a schematic view of the structure of the nail head according to an embodiment of the present invention;

fig. 3 is a schematic structural view of the stapler body with one side of the housing removed according to an embodiment of the present invention;

fig. 4 is a top view of a closed switching mechanism according to an embodiment of the present invention;

FIG. 5 is an enlarged view taken at A1-A1 of FIG. 4;

FIG. 6 is a schematic view of FIG. 5 with the firing handle omitted;

fig. 7 is a schematic structural diagram of a closed switching mechanism according to an embodiment of the present invention;

fig. 8 is an exploded view of the closure switching mechanism of an embodiment of the present invention without the firing handle;

fig. 9 is a top view of the reset button and mount combination according to an embodiment of the present invention;

fig. 10 is an exploded view of the reset button and second stop of an embodiment of the present invention;

FIG. 11 is a schematic view of a linkage assembly in a first position in accordance with an embodiment of the present invention in cooperation with other assemblies;

FIG. 12 is a structural schematic view of the linkage assembly in a second state in cooperation with other components in accordance with an embodiment of the present invention;

FIG. 13 is a cross-sectional view of a connecting rod assembly in a second state in accordance with an embodiment of the present invention;

fig. 14 is a schematic view of the reset button after closing the nail head according to an embodiment of the present invention;

fig. 15 is a schematic structural view of a closed switching mechanism when the nail head is opened by pressing the reset button according to an embodiment of the present invention;

fig. 16 is a schematic structural diagram of a closed switching mechanism after the nail head is closed according to another embodiment of the present invention.

Reference numerals are as follows:

1 stapler body 44 second Pin

11 third pin shaft for fixing handle 45

12 closing pull-tab 46 drive knob (embodiment 1)

13 shell 47 elastic member

131 guide groove 48 drive knob (embodiment 2)

132 circumferential groove 5 closure draw bar assembly

14 fastener 51 cover

141 pin hole 511 through hole

15 handle return spring 512 step surface

16 switching actuator (embodiment 2) 52 drive unit

18 connecting rod 521 guide

19 first connecting pin 53 second connecting pin

2 actuating lever 61 second return spring

21 rack 62 first return spring

3 third reset spring of trigger handle 63

31 claw 7 backspacing pull rod

32 first mating portion 8 reset button

4 link assembly 81 operation part

41 first lever 82 reset mating portion

411 second fitting portion 821 spring mounting hole

412 first pivot part 822 chute

413 third pivoting portion 823 distal surface of the reduction fitting portion

414 mounting groove 9 nail head

4141 mounting groove first side wall 91 anvil

4142 mounting groove second sidewall 911 first mating groove

42 second rod 92 staple cartridge assembly

422 second pivot part 921 second matching groove

423 fourth pivoting part 93 closing pin

43 first Pin

Detailed Description

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

The utility model provides a closed switching structure for a medical anastomat and the medical anastomat comprising the same. The anastomat further comprises an anastomat head and an anastomat body, and the anastomat head is arranged on the far-end side of the anastomat body. The closing switching mechanism is used for switching the closing state of the nail head. The closing switching mechanism comprises a connecting rod, a closing pull piece and a reset button. The connecting rod extends along the axial direction of the anastomat. The closing pull piece is at least partially positioned in the connecting rod and can axially move relative to the connecting rod, a first stop part is fixedly arranged on the near end side of the closing pull piece, the far end side of the closing pull piece is connected with the nail head, the nail head can be controlled to be closed when the closing pull piece moves towards the near end side of the anastomat, and the nail head can be controlled to be opened when the closing pull piece moves towards the far end side of the anastomat.

The reset button is positioned at the near end side of the connecting rod, at least part of the reset button enters the inside of the connecting rod and can move axially relative to the connecting rod. Due to the existence of the structural dimension chain tolerance of the anastomat, the situation that the closing pull sheet does not return to the position after the anastomat is opened may occur, when the nail head needs to be manually opened, the reset button is operated to move towards the direction of the far end side of the anastomat, the closing pull sheet is driven to move towards the direction of the far end side of the anastomat, the nail head is manually opened, and therefore the situation that the nail head cannot be normally opened due to the fact that the closing pull sheet does not return to the position is avoided.

The structure of the closed switching mechanism according to each embodiment of the present invention is described in detail below with reference to the accompanying drawings, and it should be understood that each embodiment is not intended to limit the scope of the present invention.

As shown in fig. 1 to 15, it is a schematic structural diagram of a closed switching mechanism and a medical stapler including the same according to an embodiment of the present invention. As shown in fig. 1, the stapler includes a nail head 9, a stapler body, and a closing switching mechanism for controlling closing and opening of the nail head 9, the nail head 9 being provided on a distal end side of the stapler body 1, and fig. 1 shows a state when the nail head 9 is opened. The stapler body 1 includes a housing 13 and a fixing handle 11 provided at one side. As shown in fig. 1 and 2, the nail head 9 comprises an anvil 91 and a cartridge assembly 92 which are oppositely arranged, and the anvil 91 has a third state of opening relative to the cartridge assembly 92 and a fourth state of closing relative to the cartridge assembly 92. The proximal end side of the nail anvil 91 is provided with an inclined first matching groove 911, the proximal end side of the nail cartridge assembly 92 is provided with an axially extending second matching groove 921, and a closing pin 93 simultaneously penetrates through the first matching groove 911 and the second matching groove 921. The closure switching mechanism comprises a closure pull tab 12 for closing the stud 9, the distal side of the closure pull tab 12 being connected to the closure pin 93. In the initial state, the closing pin 93 is located at the distal end side of the second engagement slot 921, and the anvil 91 is in the third state. When the closing pull tab 12 pulls the closing pin 93 to move from the distal side to the proximal side of the second matching slot 921, the anvil 91 enters the fourth state, and the anvil 91 and the cartridge assembly 92 clamp tissue. The process of bringing the anvil 91 from the third condition to the fourth condition is referred to as the closing process of the head 9, i.e. the closing process of the stapler. During the firing of the stapler, it is necessary to keep the staple head 9 closed. After the stapler firing is completed, the closing pin 93 and the closing tab 12 may open the staple head 9 when they are moved in the distal direction.

The utility model discloses in, distal end side and near-end side are for the operator, and the one end that is nearer apart from the operator is near-end side, and the one end far away apart from the operator, the one end that is more close to the operation position promptly is the distal end side, follows the direction in the axle center of anastomat is the axial, and the direction from the distal end side of anastomat to near-end side promptly, or from the near-end side of anastomat to the direction of distal end side. For example, in the perspective of fig. 1, the distal side is the left side and the proximal side is the right side for the stapler. The direction S1 in fig. 1 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 S2 direction in fig. 3 is defined as a longitudinal direction, i.e., a height direction. The S3 direction in fig. 4 is defined as the lateral direction, i.e., the width direction. The inner side and the outer side of the utility model are relative to the axle center of the anastomat, the inner side is one side close to the axle center, and the outer side is one side far away from the axle center.

As shown in fig. 3 to 6, the closing and switching mechanism further includes a connecting rod 18 and a reset button 8. The connecting rod 18 extends in the axial direction of the stapler. The closure pull tab 12 is at least partly located inside the connector bar 18 and is axially movable relative to the connector bar 18, the proximal side of the closure pull tab 12 being provided with a first stop. The reset button 8 is located at the proximal end side of the connecting rod 18, the reset button 8 comprises an operation part 81 and a reset fitting part 82, the reset fitting part 82 of the reset button 8 at least partially enters the inside of the connecting rod 18 and is axially movable relative to the connecting rod 18, the operation part 81 is connected to the proximal end side of the reset fitting part 82, and the proximal end face of the operation part 81 is a surface suitable for pressing operation by an operator. In the initial state, the reset matching portion 82 abuts against the first stop portion. If the closure tab 12 is moved in a proximal direction, the first stop may drive the reset mating feature 82 in a proximal direction. Meanwhile, when the nail head needs to be manually opened, the operating part 81 of the reset button 8 is operated to move towards the far-end side direction of the anastomat, the reset matching part 82 is abutted against the first stop part, and the closing pull sheet 12 is driven to move towards the far-end side direction of the anastomat, so that the nail head can be manually opened, and the situation that the nail head cannot be normally opened due to the fact that the closing pull sheet 12 cannot return to the original position is avoided.

As shown in fig. 3 to 6, the closing and switching mechanism further includes a second stopper portion. The second stop portion is located at a proximal side of the first stop portion, and is axially fixed to a housing 13 of the stapler body. The reset button 8 is stopped at the second stop when it is driven in the proximal direction of the stapler. The main body 13 of the anastomat is provided with a second stop part matching part, and the second stop part is rotatably arranged on the second stop part matching part. In this embodiment, the second stop portion is a first connecting pin 19. The second stop portion fitting portion is a circumferential groove 132 provided on the inner surface of the housing 13, the first connecting pin 19 is movably provided in the circumferential groove 132, and the first connecting pin 19 is rotatable in the circumferential groove 132. Here, the first connecting pin 19 rotating means that the first connecting pin 19 rotates along its own axis.

As shown in fig. 6, the operating portion 81 is located on the proximal end side of the first connecting pin 19, and the first connecting pin 19 is at least partially inserted into the return fitting portion 82. Specifically, the side surface of the reset mating portion 82 is provided with a sliding groove 822 extending along the axial direction, the first connecting pin 19 at least partially enters the sliding groove 822 and can move along the extending direction of the sliding groove 822, and the first connecting pin 19 and the sliding groove 822 cooperate to limit the reset mating portion 82 to have only axial movement relative to the first connecting pin 19, that is, the reset mating portion 82 does not have lateral and longitudinal displacement relative to the first connecting pin 19 and cannot rotate relative to the first connecting pin 19. The slide channel 822 is not connected to the distal and proximal ends of the return fitting 82, thereby ensuring that the first connecting pin 19 does not separate from the return fitting 82 at the distal and proximal ends of the slide channel 822.

In the embodiment shown in fig. 3-6, the closure switching mechanism further comprises a ring-shaped securing member 14, the securing member 14 being located on a proximal side of the connecting rod 18. The housing 13 of the stapler body 1 is provided with a fixing member mounting hole adapted to the shape of the fixing member 14, and the fixing member 14 is fixed in the fixing member mounting hole 132 to realize the fixed connection of the fixing member 14 with respect to the housing 13 of the stapler body 1. The operation portion 81 of the reset button 8 is located at the proximal end side of the fixing member 14, the reset matching portion 82 is disposed through the inside of the fixing member 14, and the reset matching portion 82 can move along the axial direction of the stapler relative to the fixing member 14, and the longitudinal position and the transverse position of the reset button 8 are further limited by the fixing member 14, so that the reset button 8 only moves axially relative to the housing 13 of the stapler body 1. In this embodiment, the outer diameter of the return fitting portion 82 is smaller than the inner diameter of the fixing member 14, and the outer diameter of the operating portion 81 is larger than the inner diameter of the fixing member 14, so that the operating portion 81 can be held on the proximal side of the fixing member 14 without entering the inside of the fixing member 14.

In this embodiment, the first stop portion is a second connecting pin 53, as shown in fig. 3 to 6. The closure switching mechanism can further comprise a structure for driving the nail head to be closed, and specifically, the closure switching mechanism further comprises a firing handle 3, a connecting rod assembly 4 and a closure pull rod assembly 5. The firing handle 3 is pivotally connected to the housing 13 of the stapler body 1, the firing handle 3 includes a first mating portion 32, and a handle return spring 15 is disposed between the firing handle 3 and the stapler housing. When the trigger handle 3 is held and rotated toward the fixed handle 11, the handle return spring 15 is elastically deformed. The link assembly 4 includes a first rod 41 and a second rod 42, the second rod 42 is located on a proximal end side of the first rod 41, the first rod 41 includes a first pivot portion 412, and the second rod 42 includes a second pivot portion 422. The connecting-rod assembly 4 comprises two relatively stable states: a first condition corresponding to the head being open and a second condition corresponding to the head being closed. The first pivot portion 412 is pivotally connected to the housing 13 of the stapler body 1 by a first pin 43, so that the first pivot portion 412 does not move axially relative to the housing 13 of the stapler body 1. The second pivot portion 422 is located at a proximal side of the first pivot portion 412, and the second pivot portion 422 is pivotally connected to the driving portion 52 of the closing lever assembly 5 through a third pin 45. When the link assembly 4 is in the first state and the firing handle 3 rotates along the first direction (counterclockwise direction in fig. 3), the first matching portion 32 drives the link assembly 4 to enter the second state, the second pivot portion 422 of the link assembly 4 moves towards the proximal side direction of the stapler, and drives the closing pull rod assembly 5 to move towards the proximal side direction of the stapler, and the closing pull rod assembly 5 and the proximal side of the closing pull piece 12 are fixedly connected through the second connecting pin 53, so that the closing pull piece 12 can be driven to move towards the proximal side direction, and the closing of the head of the staple can be realized.

The structure of the closing and switching mechanism of the embodiment in different states will be described in detail with reference to fig. 3 to 15. Fig. 3 to 11 show the structure of the closed switching mechanism when the nail head is open, wherein the connecting rod assembly 4 is in the first state. 12-14 show the configuration of the closure switching mechanism when the head is closed, wherein the linkage assembly 4 is in the second state. Fig. 15 shows the structure of the closure switching mechanism after the nail head is opened again by the closure switching mechanism in the nail head closed state in the embodiment, in which the link assembly 4 is returned to the first state.

In the initial state, the connecting-rod assembly 4 is in the first state, as shown in fig. 6 to 8. The link assembly 4 is in a relatively compact state, and the distance between the first pivot portion 412 and the second pivot portion 422 of the link assembly 4 is relatively small. The closed pull rod assembly 5 comprises a sleeve establishing portion 51 and a driving portion 52, the sleeve establishing portion 51 is sleeved on the outer portion of the connecting rod 18 and can move axially relative to the connecting rod 18, a through hole 511 is formed in the far end side of the sleeve establishing portion 51, the second connecting pin 53 penetrates through the through hole 511, and the far end side of the sleeve establishing portion 511 is fixedly connected with the near end side of the closed pull piece 12. The driving portion 52 is located on a side of the sheathing portion 51 facing the link assembly 4, and one end of the driving portion 52 is pivotally connected to the second pivot portion 422 of the link assembly 4. A second biasing member is further disposed between the sleeve portion 51 and the first connecting pin 19, and the second biasing member provides a biasing force to the sleeve portion 51 toward the distal side of the stapler. Specifically, the second biasing member is a second return spring 61, the second return spring 61 is disposed between the step surface 512 inside the sleeve portion 51 and the first connecting pin 19, and the second return spring 61 may be, for example, a compressed spring. As shown in fig. 2 and 8, the side surface of the driving part 52 is provided with at least one guide part 521, the inner surface of the housing 13 of the stapler is provided with at least one guide groove 131, the guide groove 131 extends along the axial direction, and the guide part 521 at least partially enters the guide groove 131 and can move along the extending direction of the guide groove 131 to limit the displacement of the driving part 52 only along the axial direction.

The first rod 41 further includes a third pivot portion 413 and a second matching portion 411, the second rod 42 includes the second pivot portion 422 and a fourth pivot portion 423, and the third pivot portion 413 is pivotally connected to the fourth pivot portion 423 through a second pin 44. The second fitting portion 411 is fitted with the first fitting portion 32 of the firing handle 3. In the initial state, the first engaging portion 32 of the firing handle 3 abuts against the second engaging portion 411, so that the link assembly 4 is maintained in the stable first state. When the connecting rod assembly 4 is in the first state, the third pivot portion 413 and the fourth pivot portion 423 are located at a position far from the connecting rod 18.

As shown in fig. 8 to 10, a pin hole 141 is formed in a side wall of the fixing member 14, and the first connecting pin 19 penetrating through the fixing member 14 is inserted into the pin hole 141.

In this embodiment, a first biasing member is provided between the return fitting portion 82 and the first connecting pin 19, and the first biasing member biases the return fitting portion 82 in a direction toward the distal side of the stapler. Specifically, as shown in fig. 6 and 9, the first biasing member is a first return spring 62, a cavity is formed inside the return fitting portion 82, and the first return spring 62 is disposed inside the cavity, in a preferred embodiment, one end of the first return spring 62 abuts against a distal end of the cavity, and a second end of the first return spring 62 abuts against the first connecting pin 19, so as to maintain the return button in a stable state. The first return spring 62 may be a compression spring, for example. A spring mounting hole 821 may be formed on the upper surface of the cavity for mounting the first return spring 62 inside the cavity of the return fitting portion 82.

As shown in fig. 6, 7 and 11, when the link assembly 4 is in the first state, a distance between the first pivot portion 412 and the second pivot portion 422 of the link assembly 4 is L1, and an included angle between the first rod 41 and the second rod 42 is a 1. When the firing handle 3 rotates in the first direction (counterclockwise direction in fig. 7), the first engaging portion 32 of the firing handle 3 engages with the second engaging portion 411 of the first rod 41, and drives the first rod 41 to rotate around the first pin 43 in the S4 direction (counterclockwise direction in fig. 11), the second rod 42 rotates around the second pin 44 in the S5 direction (clockwise direction in fig. 11), so that the distance between the second pivot 422 and the first pivot 412 is gradually increased, the included angle between the first rod 41 and the second rod 42 is gradually increased, the third pivot 413 and the fourth pivot 423 move toward the connecting rod 18, and the connecting rod assembly 4 enters the second state shown in fig. 12. As can be seen from a comparison of fig. 11 and 12, after the connecting rod assembly 4 is in the second state, the distance between the second pivot portion 422 and the first pivot portion 412 increases from L1 to L2, and the angle between the first rod 41 and the second rod 42 also increases to an angle of approximately 180 °. Since the first pivot portion 412 is not axially displaced relative to the housing 13 of the stapler body 1, the second pivot portion 422 in the second state moves in a proximal direction compared to the second pivot portion 422 in the first state, and drives the closing lever assembly 5 to move in the proximal direction. At this time, the link assembly 4 is maintained in a relatively stable second state, and even if the trigger handle 3 is released at this time, the trigger handle 3 returns to its initial position by the handle return spring 15, and the state of the link assembly 4 is not changed.

As shown in fig. 12 to 14, when the link assembly 4 enters the second state from the first state, since the closing lever assembly 5 moves toward the proximal side, the closing lever assembly 5 drives the closing pull tab 12 to move toward the proximal side through the second connecting pin 53, so as to close the head. Meanwhile, the second connecting pin 53 abuts against the distal end surface 823 of the reset matching portion 82 and drives the reset matching portion 82 to move in the proximal direction, the reset button 8 moves in the proximal direction as a whole, until there is an axial distance between the distal end of the operating portion 81 and the proximal end of the fixing member 14, and the operating portion 81 protrudes out of the proximal side of the housing 13 of the stapler. At this time, the reset fitting portion 82 of the reset button 8 compresses the first reset spring 62 to be deformed, and the sleeve portion 51 of the closure lever assembly 5 compresses the second reset spring 61 to be deformed.

In this embodiment, the closing and switching mechanism may further include an automatic stud opening structure after the stud is closed. In particular, the linkage assembly 4 further comprises a drive knob 46, and the closure switching mechanism further comprises a switching drive. In this embodiment, the closure switching mechanism further comprises an actuating rod 2 sleeved outside the connecting rod 18, a rack 21 is disposed on a side of the actuating rod 2 facing the connecting rod assembly 4, and the rack 21 serves as a driving member for the stapler to fire and also serves as the switching driving member. The rack 21 comprises a first position area and a second position area, the first position area being located on a proximal side of the second position area. In the initial state, the rack 21 is in the first position region. As shown in FIG. 5, the firing handle 3 also includes a pawl 31 that engages the rack 21. After the closing of the staple head, the pawl 31 can drive the rack 21 in the distal direction by holding the firing handle 3 again, so that the rack 21 carries the actuating rod 2 in the distal direction for firing the stapler.

The driving knob 46 is rotatably connected to the first lever 41 or the second lever 42. Specifically, as shown in fig. 12 and 13, in this embodiment, the first rod 41 is provided inside with a mounting groove 414, and the first end of the driving knob 46 enters the mounting groove 414 and is rotatable around the first end in the mounting groove 414. When the second end of the driving button 46 receives no external force, the second end of the driving button 46 protrudes out of a side surface of the first rod 41 facing the connecting rod 18, and the driving button 46 is close to the second side wall 4142 of the mounting groove 414. In the state of fig. 12, when the firing handle 3 is held and the rack 21 is driven to move from the first position area to the second position area, the rack 21 contacts the second end of the driving knob 46 and presses the second end of the driving knob 46 downward, the driving knob 46 is driven to rotate, so that the driving knob 46 approaches the first side wall 4141 of the mounting groove 414, and the elastic member 47 on one side is deformed, and the driving knob 46 further enters the inside of the mounting groove 414 to enter the state of fig. 13 without blocking the movement of the rack 21. At the same time, the connecting-rod assembly 4 is also maintained in the second state, maintaining the stability of the head.

After the stapler is fired, the retracting pull rod 7 is operated to move the actuating rod 2 in the proximal direction, so that when the actuating rod 2 moves from the second position area to the first position area, the rack 21 presses the driving button 46 in the direction away from the actuating rod 2, so that the driving button 46 drives the third pivot 413 and the fourth pivot 423 to move in the direction away from the connecting rod 18, so that the connecting rod assembly 4 enters the first state again, in the process, the second pivot 422 drives the closing pull rod assembly 5 to move in the distal direction, and the closing pull tab 12 is driven to move in the distal direction to automatically open the head of the stapler.

However, in practical applications, due to dimensional chain tolerances of mechanical structures, or other conditions, the automatic opening structure of the nail head may fail, and it may happen that the linkage assembly 4 returns to an open state after firing is completed, but the closure tab does not return to a specified position, resulting in the nail head not opening properly, or the angle at which the nail head opens is limited and cannot open completely. At this time, the manual opening of the nail head can be achieved by operating the reset button 8. Specifically, as shown in fig. 12 and 14, when the linkage assembly 4 is in the second state, the distal end of the operating portion 81 of the reset button 8 is spaced from the proximal end of the fixing member 14. Meanwhile, the operation part 81 of the reset button 8 protrudes out of the surface of the shell 13, so that the operation is convenient. The operator can press the reset button 8 in a distal direction (i.e., in the direction of S6 in fig. 14) so that the reset button 8 moves in a distal direction to the position shown in fig. 15. In this process, under the driving action of the operating portion 81, the return matching portion 82 drives the second connecting pin 53 in the distal direction, so that the closing pull tab 12 moves in the distal direction to open the nail head, and at the same time, the second connecting pin 53 drives the sleeve portion 51 of the closing lever assembly 5 to move in the distal direction, the driving portion 52 of the closing lever assembly 5 drives the second pivot portion 422 to move in the distal direction, so that the third pivot portion 413 and the fourth pivot portion 423 move away from the connecting rod 18 to the positions shown in fig. 15, that is, the connecting rod assembly 4 returns to the first state, and the first return spring 62 and the second return spring 61 also return to the initial state. Therefore, in the state that the nail head of the anastomat is closed, the closing pull tab 12 can be driven to retreat towards the far end side by operating the reset button 8 to manually open the nail head, and the situation that the nail head cannot be normally opened due to the fact that the closing pull tab 12 cannot retreat is avoided.

Fig. 16 is a schematic structural diagram of a closed switching mechanism according to another embodiment of the present invention. This embodiment differs from the embodiment shown in FIGS. 1-15 in that: the closing and switching mechanism comprises a structure that the nail head is manually closed and manually opened. Specifically, the closing and switching mechanism further comprises a switching driving member 16, and one end of the switching driving member 16 protrudes out of the housing of the stapler body, so that the operator can conveniently hold the stapler body by hand. The third pivot 413 of the first lever 41 is provided with a driving knob 48, and the driving knob 48 is not rotatable relative to the first lever 41. The switching driving element 16 is sleeved outside the connecting rod 18, and a third return spring 63 is disposed between the switching driving element 16 and the housing of the stapler body 1, where the third return spring 63 may be a compression spring, for example. The switch drive 16 comprises a third position region and a fourth position region, the third position region being located on a distal side of the fourth position region. In the initial state, the shift drive 16 is in the third position range. By operating the switching drive 16 to move from the third position region to the fourth position region in the direction of the proximal end of the stapler, the closing lever assembly 5 is driven to move in the direction of the proximal end, closing the head 9. Meanwhile, the closing lever assembly 5 drives the second pivot portion 422 to move toward the proximal direction through the driving portion 52, and the third pivot portion 413 and the fourth pivot portion 423 of the link assembly 4 move toward the direction close to the link 18, so that the link assembly 4 enters the second state from the first state. During stapling, the switching drive 16 is located on the proximal side of the drive knob 48 and does not act on the linkage assembly 4, and the linkage assembly 4 remains in the second state. After the stapler is fired, when the switching driving member 16 is operated to move from the fourth position area to the third position area toward the distal end side of the stapler, the third return spring 63 is compressed, the switching driving member 16 presses the driving button 46 of the connecting rod assembly 4 in the direction away from the connecting rod 18, so that the third pivoting portion 413 and the fourth pivoting portion 423 move in the direction away from the connecting rod 18, the connecting rod assembly 4 returns to the first state, the closing pull rod assembly 5 moves in the distal end side direction, and the closing pull rod 12 is driven to move in the distal end side direction to open the staple head 9.

In the embodiment of fig. 16, if the switching driving element 16 fails or the switching driving element 16 cannot fully open the stud, the operating portion 81 of the reset button 8 is pressed in the direction of S6 in fig. 16, so that the operating portion 81 drives the reset fitting portion 82 to move in the distal direction, so that the closing pull tab 12 moves in the distal direction to open the stud, and meanwhile, the second connecting pin 53 drives the sleeve portion 51 of the closing pull rod assembly 5 to move in the distal direction, the driving portion 52 of the closing pull rod assembly 5 drives the second pivot portion 422 to move in the distal direction, so that the third pivot portion 413 and the fourth pivot portion 423 move away from the connecting rod 18, and the connecting rod assembly 4 returns to the first state.

In fig. 1 to 15, the closing switching mechanism includes a structure for driving the nail head to close by the trigger handle, a structure for automatically opening the nail head, and a structure for manually operating the reset button to reset when the structure for automatically opening the nail head fails. In the embodiment of fig. 16, the closing and switching mechanism includes a mechanism for manually closing and opening the head of the nail and a mechanism for manually operating the reset button to reset when the switching actuator 6 fails. In another alternative embodiment, the reset button reset structure in the closing and switching mechanism can be matched with other structures with the nail head opened, and is not limited to the structure of the rack and the driving button shown in fig. 1-15 and the structure of the switching driving member and the driving button shown in fig. 16. In still another alternative embodiment, also can not set up the automatic/manual structure of opening of pin fin, but only set up through the closed structure of percussion handle drive pin fin and the button that resets structure, through the closed back of percussion handle drive pin fin, through the percussion handle drive anastomat percussion, then directly through the operation button that resets open the pin fin, also belong to the utility model discloses an within the protection scope. In yet another alternative embodiment, other structure for driving the closing of the stud may be provided, in combination with the structure of the reset button.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims

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

a connecting rod extending in an axial direction of the stapler;

2. The closure switching mechanism of claim 1, wherein the stapler includes a stapler body, the closure switching mechanism further comprising a second stop located proximally of the first stop and axially fixed to a housing of the stapler body;

the reset button is driven to abut against the first stop part when moving towards the far end side direction of the anastomat, and the reset button is driven to abut against the second stop part when moving towards the near end side direction of the anastomat.

3. The closure switching mechanism of claim 2 wherein said stapler body is provided with a second stop cooperating portion, said second stop being rotatably provided to said second stop cooperating portion.

4. The closure switching mechanism of claim 3, wherein the second detent engagement portion is a circumferential groove disposed in the housing, and wherein the second detent is a first connecting pin movably disposed in the reset button, the first connecting pin being rotatably disposed in the circumferential groove.

5. The closure switching mechanism of claim 4, further comprising an annular securing member, wherein the first connecting pin is fixedly attached to the securing member, and wherein the securing member is rotatably disposed in the circumferential slot.

6. The closure switching mechanism of claim 5, wherein the reset button is at least partially accessible to an interior of the fixture, and wherein the reset button is axially movable relative to the fixture.

7. The closure switching mechanism of claim 4, wherein the reset button comprises a reset mating portion and an operating portion located at a proximal side of the reset mating portion, wherein the operating portion is located at a proximal side of the second stop portion, wherein the second stop portion is disposed through the reset mating portion, and wherein the reset mating portion is movable relative to the second stop portion in an axial direction of the stapler.

8. The closure switching mechanism of claim 7, wherein a side surface of the return engagement portion is provided with a slide groove extending in an axial direction, and the first connecting pin at least partially enters the slide groove and is movable in an extending direction of the slide groove.

9. The closure switching mechanism of claim 8, wherein the chute is not connected to the distal and proximal ends of the reset mating portion.

10. The closure switching mechanism of claim 7, wherein a first biasing member is disposed between the return engagement portion and the first connecting pin, the first biasing member biasing the return engagement portion in a direction toward a distal side of the stapler.

11. The closure switching mechanism of claim 10, wherein the first biasing member is a first return spring, a cavity is formed in the return engagement portion, the first return spring is disposed in the cavity, one end of the first return spring abuts against a distal end of the cavity, and a second end of the first return spring abuts against the first connecting pin.

12. The closure switching mechanism of claim 2, wherein the first stop portion is a second connection pin, the second connection pin is disposed through a proximal side of the closure pull tab, and the reset mating portion is located on the proximal side of the second connection pin;

13. The closure switching mechanism of claim 12, further comprising a closure pull rod assembly, wherein the closure pull rod assembly comprises a sleeve portion, the sleeve portion is sleeved outside the connecting rod and can move axially relative to the connecting rod, and the sleeve portion is fixedly connected to the proximal end of the closure pull tab through the second connecting pin.

14. The closure switching mechanism of claim 13, wherein a second biasing member is disposed between the sleeve portion and the second stop portion, the second biasing member biasing the sleeve portion in a direction toward a distal side of the stapler.

15. The closure switching mechanism of claim 13, wherein the closure pull rod assembly further comprises a drive portion, the closure switching mechanism further comprising:

a firing handle including a first mating portion;

16. The closure switching mechanism of claim 15, wherein the linkage assembly comprises a first rod and a second rod, the second rod being located on a proximal side of the first rod, the first rod comprising the first pivot and a third pivot, the second rod comprising the second pivot and a fourth pivot, the third pivot being pivotally connected to the fourth pivot;

17. The closure switching mechanism of claim 16, wherein the linkage assembly further comprises a drive knob, the closure switching mechanism further comprises an actuation lever and a switching drive member, the actuation lever is sleeved outside the linkage rod, and the switching drive member is disposed on a side of the actuation lever facing the linkage assembly;

18. The closure switching mechanism of claim 17, wherein the drive knob is rotatably coupled to the first rod or the second rod, the linkage assembly is in the second state, and the switching drive portion drives the first end of the drive knob to move in a distal direction without blocking movement of the actuation rod when the actuation rod moves in a distal direction of the stapler.

19. The closed switching mechanism of claim 13, further comprising:

20. A medical stapler, characterized in that it comprises a closure switching mechanism according to any one of claims 1 to 19.