CN111317536B

CN111317536B - Circular tube stapler

Info

Publication number: CN111317536B
Application number: CN201811533217.3A
Authority: CN
Inventors: 陈望东; 孙克展
Original assignee: Suzhou Tianchen International Medical Technology Co Ltd
Current assignee: Suzhou Tianchen International Medical Technology Co Ltd
Priority date: 2018-12-14
Filing date: 2018-12-14
Publication date: 2025-04-22
Anticipated expiration: 2038-12-14
Also published as: CN111317536A

Abstract

The invention provides a circular tube type anastomat which comprises an anastomat body, wherein the anastomat body comprises a nail bin assembly, a nail pushing sheet, a nail pushing rod and a nail anvil shaft, a firing sheet is arranged at the proximal end of the nail pushing sheet, a bending part is arranged at the proximal end of the firing sheet, and a fixing part is arranged on the nail anvil shaft. According to the invention, when the distance between the nail anvil assembly and the nail bin does not reach the proper position, the fixing part matched with the nail pushing plate is positioned in the first position area, the nail pushing rod is not linked with the nail pushing plate, even if the operating handle is held, the nail pushing rod can not push the nail pushing plate, and false firing can not be caused, when the nail anvil assembly moves to the proper position, the fixing part is positioned in the second position area, the nail pushing rod can be linked with the nail pushing plate, and at the moment, if the operating handle is held, the nail pushing rod can push the nail pushing plate to fire, so that the false firing when an operation is not ready is prevented under the premise of ensuring normal operation of the nail pushing rod and the nail pushing plate, and the safety of the use of the instrument is improved.

Description

Circular tube type anastomat

Technical Field

The invention relates to the technical field of medical instruments, in particular to a circular tube type anastomat.

Background

The digestive tract disease is one of the diseases of high incidence of human beings, and in the treatment process, a circular tube type anastomat is often used for anastomosing physiological tissues such as the digestive tract instead of manual operation of doctors. The circular tube type anastomat is a common surgical instrument, and most of the circular tube type anastomat adopts an axial inner stapling mode, forms end-to-end or end-to-side anastomosis on physiological tissues such as esophagus, stomach, intestinal canal and the like during operation, is accommodated in the anastomat in a astringing way during anastomosis, forms a circular anastomosis opening on the tissues after the completion of percussion, and reconstructs a human body channel.

In the prior art, the circular tube type anastomat comprises an anastomat body, an operating handle movably connected with the anastomat body and a nail anvil component matched with the body. The anastomat body comprises a nail bin assembly arranged at the far end, wherein the nail bin assembly comprises an annular nail bin and a cutter, and a knob arranged at the near end of the body, the knob can rotate relative to the body, and the inside of the anastomat body also comprises a nail anvil shaft arranged from the near end to the far end. The distal and proximal ends are here the proximal ends with respect to the operator, the ends closer to the operator being the proximal ends, the ends further from the operator, i.e. the ends closer to the surgical site being the distal ends. In the anastomat, the inner side and the outer side are opposite to the axis of the anastomat, one side close to the axis is the inner side, and one side far away from the axis is the outer side. The nail anvil assembly comprises a nail anvil, a nail anvil cap arranged at the far end of the nail anvil and a knife anvil arranged inside the nail anvil, and the nail anvil assembly can be directly connected with the far end of the nail anvil shaft or connected with the far end of the nail anvil shaft through a nail anvil shaft connecting piece. In the tumor operation process, after tumor tissues are removed by separation, the nail anvil shaft penetrates out of the purse of the residual tissues and is configured at the far end of the anastomat body, and the knob is rotated, so that the distance between the nail anvil assembly and the nail bin is gradually reduced to reach a proper distance, and then the nail anvil assembly and the nail bin can be in a firing state, and then the operation handle firing instrument can be held to complete anastomosis. Along with the continuous development of medical instruments, the circular tube type anastomat is also widely applied to the treatment of hemorrhoids and other diseases.

As described above, in either the operation of tumor treatment or the treatment of hemorrhoids, it is necessary to rotate the knob to bring the anvil assembly and the cartridge to a suitable distance before firing the stapler. However, when a circular tube type stapler is actually used for performing an operation, an operator may inadvertently grasp the operating handle to cause false firing when the distance between the anvil assembly and the staple cartridge does not reach a proper position, thereby causing operation failure and possibly even causing medical accidents.

Disclosure of Invention

Aiming at the problems in the prior art, the invention aims to provide a circular tube type anastomat, when the distance between a nail anvil component and a nail bin does not reach a proper position, even if an operating handle is held, a nail pushing rod can not push a nail pushing sheet, and false firing can not be caused.

The embodiment of the invention provides a circular tube type anastomat, which comprises an anastomat body, wherein the anastomat body comprises a nail pushing rod, a nail pushing sheet and a nail bin assembly which are sequentially arranged from the proximal end to the distal end of the anastomat body, the proximal end of the nail pushing sheet comprises at least one nail anvil shaft, the nail anvil shaft is sequentially penetrated in the nail pushing sheet and the nail pushing rod, a fixing part is arranged on the nail anvil shaft, the nail pushing sheet is penetrated between the fixing part and the nail anvil shaft, the fixing part can move between a first position area and a second position area, and the second position area is positioned at the proximal end side of the first position area;

The fixing part is positioned in the first position area, the nail pushing rod is not linked with the firing sheet, the anastomat can not fire, and the fixing part is positioned in the second position area, the nail pushing rod is linked with the firing sheet, and the anastomat can fire.

Optionally, the fixing part is a fixing ring surrounding the anvil shaft.

Optionally, at least one connecting block is arranged on the fixing ring, the fixing ring is fixedly connected with the nail anvil shaft through the connecting block, the number of the firing sheets is at least two, and the connecting block is located between the firing sheets.

Optionally, the fixing part comprises a plurality of fixing pieces, the fixing pieces are in one-to-one correspondence with the firing pieces, and the proximal ends of the firing pieces are arranged between the corresponding fixing pieces and the nail anvil shaft in a penetrating manner.

Optionally, the proximal end of the firing plate is provided with a bending part, when the fixing part is located in the first position area, the bending part of the firing plate extends out from the proximal end of the fixing part and is not pressed by the fixing part to tilt outwards to form a cavity with the nail anvil shaft, and when the nail pushing rod moves from the proximal end of the anastomat to the distal end, the nail pushing rod enters the cavity;

when the fixing part is positioned in the second position area, the bending part enters between the fixing part and the nail anvil shaft and is folded inwards under the pressure of the fixing part, and the nail pushing rod contacts with the bending part to be linked when moving from the proximal end to the distal end of the anastomat.

Optionally, the proximal end of the bending part comprises a first matching part, the distal end of the nail pushing rod comprises a second matching part, and when the bending part is folded inwards, the first matching part of the bending part is embedded in the second matching part of the nail pushing rod.

Optionally, the first matching portion includes a protrusion disposed on the bending portion and facing the anvil shaft, the second matching portion includes a groove corresponding to the protrusion, and when the bending portion is folded inwards, the protrusion is embedded in the groove.

Optionally, the recess of the distal end of the staple pusher bar includes a plurality of recesses in one-to-one correspondence with the firing plates.

Optionally, the groove of the distal end of the ejector pin is a concave ring surrounding the ejector pin.

Optionally, the second matching part comprises a protrusion arranged on the nail pushing rod and facing to the outer side, the first matching part comprises a groove corresponding to the protrusion, and when the bending part is folded inwards, the protrusion is embedded in the groove.

Optionally, the bending part is an elastic piece.

Optionally, the stapler further comprises an operating handle pivotally connected to the stapler body, and pressing the operating handle drives the ejector pin to move from the proximal end of the stapler to the distal end.

Optionally, the stapler body further includes a knob located at a proximal end of the stapler body, the knob is connected to the proximal end of the anvil shaft through a screw rod assembly, and when the knob rotates, the screw rod assembly drives the anvil shaft to axially move relative to the stapler body.

The circular tube type anastomat provided by the invention has the following advantages:

The invention provides a circular tube type anastomat, wherein when the distance between a nail anvil assembly and a nail bin does not reach a proper position, a fixing part matched with a firing plate is positioned in a first position area, at the moment, a nail pushing rod and the nail pushing plate are not linked, even if an operation handle is held, the nail pushing rod can not push the nail pushing plate, and the false firing of the anastomat can not be caused, when the nail anvil assembly moves to a proper position relative to the nail bin, the fixing part is positioned in a second position area, the nail pushing rod is linked with the nail pushing plate, at the moment, if the operation handle is held, the nail pushing rod can push the nail pushing plate to fire the anastomat, so that the false firing when an operation is not ready is prevented, and the use safety of the anastomat is improved.

Drawings

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

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

FIG. 2 is a schematic view of a stapler with one side housing removed, according to an embodiment of the present invention;

FIG. 3 is a schematic illustration of a pointer mated with a pull tab according to an embodiment of the present invention;

FIG. 4 is a schematic view of an anvil shaft according to an embodiment of the present invention;

FIG. 5 is a schematic view of the engagement of the ejector pin blades with the ejector pins in an initial state in accordance with one embodiment of the present invention;

FIG. 6 is an enlarged view at A1 of FIG. 5;

FIG. 7 is a cross-sectional view of the engagement of the ejector pin blade with the ejector pin in a fail-safe condition in accordance with one embodiment of the present invention;

FIG. 8 is an enlarged view at A2 of FIG. 7;

FIG. 9 is a schematic view of the cooperation of the ejector pin blade and ejector pin in a normal operating condition according to one embodiment of the present invention;

FIG. 10 is a cross-sectional view of the engagement of the ejector pin blade with the ejector pin during normal operation of an embodiment of the present invention;

fig. 11 is an enlarged view at A3 in fig. 10.

Reference numerals:

1. stapler body housing 52 screw assembly

2. Nail cartridge assembly 53 pointer

3. Push pin 54 pull tab

31. Nail anvil shaft of nail pushing part 6

32. Firing piece 61 fixing ring

321. Bent and tilted part 62 connecting block

322. Raised 7 handle

4. Nail anvil assembly of nail pushing rod 8

41. Recess 81 nail anvil

42. Proximal end 82 anvil shaft connector for a staple pusher

51. Knob

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary 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.

In order to solve the technical problems in the prior art, the invention provides a circular tube type anastomat, which comprises an anastomat body, wherein the anastomat body comprises a nail pushing rod, a nail pushing sheet and a nail bin assembly which are sequentially arranged from the proximal end to the distal end of the anastomat body, the proximal end of the nail pushing sheet comprises at least one nail anvil shaft, the nail anvil shaft is sequentially arranged in the nail pushing sheet and the nail pushing rod in a penetrating way, a fixing part is arranged on the nail anvil shaft, the nail pushing sheet is arranged between the fixing part and the nail anvil shaft in a penetrating way, the fixing part can move between a first position area and a second position area, and the second position area is positioned on the proximal end side of the first position area. When the anastomat is in an initial state and does not reach a triggerable state, the fixed part is positioned in a first position area, and the first position area is close to the distal end of the anastomat.

When the fixing part is positioned in the first position area, the nail pushing rod is not linked with the firing sheet, the anastomat can not fire, and when the fixing part is positioned in the second position area, the nail pushing rod is linked with the firing sheet, and the anastomat can fire.

Further, the stapler can also include an anvil assembly including an anvil that can be coupled to the distal end of the anvil shaft via an anvil shaft connector, and the anvil can also be coupled directly to the distal end of the anvil shaft. When the nail anvil shaft moves along the axial direction of the anastomat, the nail anvil component is driven to move along the axial direction of the anastomat, so that the nail anvil component is far away from or close to the nail bin.

In an embodiment of the invention, a bending part is arranged at the proximal end of the firing blade, and the bending part naturally opens outwards relative to the pin anvil shaft when no external force is applied.

When the nail anvil component of the circular tube type anastomat is in an initial state of just successful butt joint with the anastomat body, the distance between the nail anvil component and the nail bin is larger, at the moment, the distance between the nail anvil component and the nail bin does not reach a proper position, the fixing part is positioned in a first position area which is closer to the distal end of the anastomat, the bending part of the firing sheet extends from the proximal end of the fixing part and is not pressed by the fixing part, a cavity is formed between the bending part and the nail anvil shaft, and when the nail pushing rod moves from the proximal end of the anastomat to the distal end, the nail pushing rod enters the cavity and does not link with the firing sheet, at the moment, even if an operator carelessly presses the handle to fire the nail pushing rod, the firing of the anastomat is not caused, and the false firing when the operation is not ready to be completed is avoided.

When operation preparation is carried out, the rotary knob is rotated to enable the nail anvil shaft to drive the nail anvil assembly to move towards the proximal end direction of the anastomat, when the distance between the nail anvil assembly and the nail bin reaches a proper position, the fixing part moves from a first position area to a second position area, the bending part enters between the fixing part and the nail anvil shaft and is pressed by the fixing part to be folded inwards, and the nail pushing rod contacts with the bending part to be linked with the firing sheet when moving from the proximal end to the distal end of the anastomat. At this time, if an operator presses the handle to fire the nail pushing rod, the anastomat can be fired, so that the normal function of the anastomat is realized. That is, the force of the handle is transmitted to the nail pushing rod by the firing rod, so that the instrument is fired.

The structure of the circular tube type anastomat according to one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 1 and 2, the structure of the stapler according to an embodiment of the present invention is shown, wherein in fig. 2, one side of the stapler housing is removed and the cartridge assembly is shown separated from the stapler body in order to more clearly show the structure inside the stapler. The anastomat comprises an anastomat body and a nail anvil assembly 8, wherein the anastomat body comprises an anastomat shell 1 and a nail bin assembly 2 positioned at the distal end of the anastomat shell 1, the nail bin assembly 2 comprises an annular nail bin and a cutter, the nail bin assembly 2 is provided with a nail pushing plate 3 and a nail pushing rod 4, when the nail pushing rod 4 is linked with the nail pushing plate 3, the movement of the nail pushing rod 4 to the distal end of the anastomat can drive the nail pushing plate 3 to move to the distal end of the anastomat, and when the nail pushing plate 3 moves to the distal end of the anastomat, the nail pushing and the cutter in the nail bin assembly 2 can be pushed out to perform anastomosis and cutting on tissues. The anastomat body further comprises a nail anvil shaft 6 which is arranged from the proximal end to the distal end, and the nail anvil shaft 6 is penetrated into the nail pushing rod 4 and the nail pushing sheet 3. The anvil assembly 8 includes an anvil shaft connector 82 and an anvil 81 disposed at a distal end of the anvil shaft connector 82, with a proximal end of the anvil shaft connector 82 coupled to a distal end of the anvil shaft 6. When the anvil assembly 8 is docked with the stapler body, the anvil shaft 6 may drive the anvil 81 via the anvil shaft connector 82 in the axial direction of the anvil shaft 6, thereby bringing the anvil assembly 8 closer to or farther from the cartridge assembly 2.

Of course, in another type of tubular stapler, such as the tubular stapler for hemorrhoid surgery described above, the anvil assembly 8 is directly connected to the stapler body, and the anvil assembly 8 cannot be removed from the stapler body, i.e. the anvil assembly 8 does not include the anvil shaft connector 82, and the anvil 81 is directly connected to the distal end of the anvil shaft 6. The present invention will be described with reference to such a stapler.

In the present invention, the distal end and the proximal end are the proximal end with respect to the operator, and the end farther from the operator, i.e., the end closer to the surgical site is the distal end. That is, in this embodiment, since the operator is holding the handle to operate the stapler when using, the end that is biased to the right is the proximal end and the end that is biased to the left is the distal end in the view of fig. 1 and 2. For example, the proximal end 42 of the ejector pin 4 is the end that is offset to the right with respect to the distal end of the ejector pin 4 for the ejector pin 4, and the proximal end of the ejector pin 3 is the end that is offset to the right with respect to the distal end of the ejector pin 3 for the ejector pin 3.

In this embodiment, the stapler further comprises an operating handle 7 pivotally connected to the stapler body, the distal end of the operating handle 7 corresponds to the proximal end of the ejector pin 4, and the rotary motion of the operating handle 7 towards the stapler body can drive the ejector pin 4 to move in a distal direction from the proximal end of the stapler.

The proximal end of the stapler body is further provided with a knob 51, and the knob 51 is connected with the proximal end of the anvil shaft 6 through a screw rod assembly 52. When the knob 51 rotates, the screw rod assembly 52 drives the anvil shaft 6 to axially move relative to the stapler body.

The structure of the circular tube type anastomat shown in fig. 1-2 is only an example, and in practical application, the structure of the circular tube type anastomat is not limited to the structure shown in the drawings, and other forms can be adopted, so that the firing of the anastomat can be realized, and the structure is within the protection scope of the invention.

Further, in this embodiment, as shown in fig. 3, the stapler body further includes a pointer 53 and a pull tab 54 positioned within the stapler body, wherein a proximal end of the pull tab 54 is coupled to the lead screw assembly 52 for movement in the axial direction of the lead screw as the lead screw assembly 52 moves. The distal end of the pull tab 54 is opposite the first end of the pointer 53, the first end of the pointer 53 having a third location area and a fourth location area, where the first end of the pointer 53 refers to the upper end of the pointer 53 in fig. 3. The pointer 53 is pivotally secured to the stapler housing 1, and the first end of the pointer 53 is movable between a third position area and a fourth position area when rotated.

In this embodiment, when the knob 51 is rotated in the first direction, the lead screw assembly 52 moves the pull tab 54 in the proximal direction of the stapler body, and the distal end of the pull tab 54 pulls the first end of the pointer 53 from the third position area to the fourth position area. In practice, the third position zone is generally referred to as the initial position zone of the pointer 53, where the distance between the cartridge assembly 2 and the anvil assembly 8 is relatively long and is not in place, and is therefore also an unfired zone, and as the knob 51 is rotated in the first direction, the anvil shaft 6 pulls the anvil 81 toward the stapler so that the distance between the anvil 81 and the cartridge assembly 2 is in place, where the pointer 53 is also pulled by the pull tab 54 to a fourth position zone, where the operator is allowed to fire the stapler, and the fourth position zone is also referred to as a cockable zone. Thus, the pointer 53 may be used as an indication of the position of the anvil shaft 6 to indicate whether the stapler has completed surgical preparation, allowing firing.

The manner in which the anvil shaft 6 is moved and the manner in which the position is indicated is merely exemplary and is not intended to be limiting of the invention. For example, the axial movement of anvil shaft 6 may be driven by other means, not necessarily using knob 51 and screw assembly 52 of the present invention, nor does the position of anvil shaft 6 necessarily use pointer 53 to indicate, or may use other means to indicate whether anvil shaft 6 and anvil 81 have reached a cocked position, or not visually.

To avoid the stapler being misfiring when anvil 81 is not moved into place. The invention further improves the anvil shaft 6, the ejector blade 3 and the ejector pin 4. As shown in fig. 4, the anvil shaft 6 is provided with a fixing portion, which in this embodiment is an annular fixing ring 61, the fixing ring 61 is sleeved on the anvil shaft 6, the fixing ring 61 is fixed on the anvil shaft 6 through a connecting block 62, and when the anvil shaft 6 moves towards the proximal direction of the anastomat, the fixing ring 61 can move along with the anvil shaft 6, and moves from the first position area to the second position area.

As shown in fig. 5 to 8 (the anvil is omitted in the drawing), the stapler is in an initial state in which the anvil assembly 8 and the stapler body are just successfully docked, and a larger distance exists between the anvil assembly 8 and the cartridge assembly 2, that is, a proper position is not reached between the anvil assembly 8 and the cartridge, and the fixing ring 61 is located in the first position area. The ejector plate 3 includes an ejector pin portion 31 at a distal end of the ejector plate 3 and a firing plate 32 at a proximal end of the ejector plate 3, and the ejector pin portion 31 and the firing plate 32 may be integrally formed, but the present invention is not limited thereto, and it is also possible to employ two separate portions and then fixedly connect. The number of firing plates 32 can be selected as desired, such as two, four, six, etc., and are within the scope of the present invention. The proximal end of the firing plate 32 is provided with a curved portion 321, and the curved portion 321 naturally opens outwards under the condition of no external force, where outwards opens refers to outwards opening relative to the axis of the anvil shaft 6.

In this embodiment, the bending portion 321 may be an elastic member, and has a shape of bending outwards in advance, when no external force is applied, the bending portion 321 keeps its initial shape to open outwards, when pressure is applied, the shape can be changed according to the direction of the pressure, and after the pressure is removed, the bending portion 321 can be restored to its initial shape. In other embodiments, the bending portion 321 may not be an elastic member, but a member pivotally connected to the proximal end of the firing plate 32, and a return mechanism may be provided at the pivotal connection, where the return mechanism may be a torsion spring, and in the initial state, the bending portion 321 has a certain rotation angle with respect to the firing plate 32, that is, the bending portion is opened outward with respect to the anvil shaft 6, and when an external force is applied, the bending portion may be folded inward with respect to the anvil shaft 6, and the torsion spring may be deformed at this time, and after the external force is removed, may return to the initial state due to the restoring force of the torsion spring. It will be appreciated that the ejector blade 3 as a whole is of a certain strength to effectively transmit force for the firing of the stapler.

When the fixing ring 61 is located in the first position area, the bent portion 321 protrudes from the proximal side of the fixing ring 421, i.e., the right side in fig. 5, after passing through the cavity between the fixing ring 421 and the anvil shaft 6. The bent and tilted portion 321 is naturally opened outward without being pressed by the fixing ring 421. At this time, if the ejector pin rod 4 moves toward the distal end of the stapler, it enters the cavity between the bent portion 321 and the anvil shaft 6, and does not drive the firing plate 32 and thus the ejector pin plate 3 to fire the stapler. Therefore, the stapler is in a failure protection state at this time, and false firing is avoided when the anvil and the staple cartridge are not in place before the operation is not ready.

In this embodiment, the securing portion is a securing ring 61 encircling the anvil shaft 6. In other embodiments, the fixing portion may not be an annular structure, but includes a plurality of fixing pieces, where the plurality of fixing pieces are in one-to-one correspondence with the firing pieces, and the proximal end of the firing piece is disposed between the corresponding fixing piece and the anvil shaft in a penetrating manner. When the fixing piece is in the first position area, the bending part of each firing piece penetrates through the corresponding fixing piece and then extends out of the proximal end side of the corresponding fixing piece.

As shown in fig. 9 to 11, at this time, the anvil shaft 6 moves further toward the proximal end of the stapler relative to the stapler body, driving the fixing ring 61 to move from the first position area to the second position area, and the distance between the anvil and the cartridge reaches a proper position. The bending part 321 enters between the fixing ring 61 and the anvil shaft 6 and is folded inwards under the pressure of the fixing ring 61, and when the staple pushing rod 4 moves from the proximal end to the distal end of the stapler, the staple pushing rod contacts with the bending part 321 and then is linked with the firing plate 32 through the cooperation of the bending part 321. At this time, if the operator holds the handle 7 to fire the nail pushing rod 4 to move from the proximal end to the distal end of the anastomat, the nail pushing sheet 3 is also pushed to push out the nail bin and the cutter in the nail bin assembly 2, and tissue suturing and cutting are performed, so that the firing of the anastomat is realized.

In this embodiment, when the position of the anvil shaft 6 and the anvil 81 is indicated by the pointer 53, the first end of the pointer 53 is located in the third position area, the fixing ring 61 is located in the first position area, and when the first end of the pointer 53 moves from the third position area to the fourth position area, the anvil shaft 6 moves in the proximal direction of the stapler body, so that the fixing ring 61 moves from the first position area to the second position area. Accordingly, the operator can determine whether the proper position is currently reached between anvil 81 and cartridge assembly 2 based on the position of the first end of pointer 53. When the first end of the pointer 53 reaches the fourth position area, the stapler can be triggered by pressing the handle 7, and the operation is performed, and when the first end of the pointer 53 reaches the third position area, even if an operator carelessly presses the handle 7, the stapler is in a failure protection state, the staple pushing sheet 3 is not pushed, and then the stapler is triggered, so that the operation failure caused by false triggering is avoided.

There are a variety of ways in which the curved portion 321 may be engaged with the distal end of the push rod 4. In this embodiment, the proximal end of the bending portion 321 includes a first mating portion, and the distal end of the push rod 4 includes a second mating portion, and when the bending portion 321 is folded inwards, the first mating portion of the bending portion 321 is engaged with the second mating portion of the push rod 4, and enters the path of the push rod 4 moving from the proximal end to the distal end.

As shown in fig. 11, the first mating portion includes a protrusion 322 of the bending portion 321 facing the anvil shaft 6, the second mating portion includes a groove 41 corresponding to the protrusion 322, and when the bending portion 321 is folded inwards, the protrusion 322 of the bending portion 321 is embedded in the groove 41 of the staple pushing rod 4. In this embodiment, the recess 41 at the distal end of the staple pusher 4 may include a plurality of recesses 41 corresponding to the firing plates 32 one by one, and the recess 41 may be configured as shown in fig. 6, and the recess 41 may be formed to be slightly larger than the protrusion 322 of the bent portion 321. In other embodiments, the recess 41 of the distal end of the ejector pin 4 may also be a recessed ring surrounding the ejector pin 4.

In other embodiments, the second mating portion may also include an outward facing protrusion of the staple pushing rod, and the first mating portion may include a recess corresponding to the protrusion. That is, in contrast to the previous embodiment, the protrusions are provided on the staple pusher bar and the recesses are provided on the firing plate. When the bending part is folded inwards, the protrusions of the nail pushing rod are embedded in the grooves of the bending part.

The invention provides a circular tube type anastomat, when the distance between a nail anvil assembly and a nail bin does not reach a proper position, a bending part at the proximal end of a firing sheet extends out of a fixing part and is naturally opened due to no external force, so that the bending part is separated from a nail pushing rod, at the moment, the nail pushing rod and the nail pushing sheet are not linked, even if an operation handle is held, the nail pushing rod can not push the nail pushing sheet, and false firing can not be caused, when the nail anvil assembly moves to a proper position relative to the nail bin, the bending part at the proximal end of the firing sheet enters the fixing part and is folded inwards under the pressure of the fixing part, and the bending part is matched with the nail pushing rod, so that the nail pushing rod and the nail pushing sheet are linked, and at the moment, if the operation handle is held, the nail pushing rod can push the nail pushing sheet to fire, on the premise that the nail pushing rod and the nail pushing sheet work normally, the false firing when an operation is not ready is prevented, and the safety of an instrument is improved.

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

Claims

1. A circular tubular stapler, comprising a stapler body, the stapler body comprising a nail pushing rod, a nail pushing sheet and a nail magazine assembly arranged in sequence from the proximal end to the distal end thereof, the proximal end of the nail pushing sheet comprising at least one firing sheet, the stapler body further comprising a nail anvil shaft, the nail anvil shaft being sequentially penetrated through the nail pushing sheet and the nail pushing rod, characterized in that the proximal end of the firing sheet is provided with a curved portion, the nail anvil shaft is provided with a fixing portion, the firing sheet is penetrated between the fixing portion and the nail anvil shaft, the fixing portion can move between a first position area and a second position area, the second position area being located at the proximal end side of the first position area;

When the fixing portion is located in the first position area, the curved portion of the firing piece extends from the proximal end of the fixing portion and is not subjected to the pressure of the fixing portion and is tilted outward to form a cavity with the anvil shaft. When the nail pushing rod moves from the proximal end to the distal end of the stapler, it enters the cavity, the nail pushing rod and the firing piece are not linked, and the stapler cannot be fired; when the fixing portion is located in the second position area, the curved portion enters between the fixing portion and the anvil shaft and is retracted inwardly due to the pressure of the fixing portion. When the nail pushing rod moves from the proximal end to the distal end of the stapler, it contacts the curved portion and causes the nail pushing rod to be linked with the firing piece, and the stapler can be fired.

2 . The circular tubular stapler according to claim 1 , wherein the fixing portion is a fixing ring surrounding the anvil shaft.

3. The circular tubular stapler according to claim 2 is characterized in that at least one connecting block is provided on the fixing ring, the fixing ring is fixedly connected to the anvil shaft through the connecting block, the firing plates are at least two plates, and the connecting block is located between the firing plates.

4. The circular tubular stapler according to claim 1 is characterized in that the fixing portion comprises a plurality of fixing members, the plurality of fixing members correspond to the firing plates one by one, and the proximal end of the firing plate is inserted between the corresponding fixing member and the anvil shaft.

5. The circular tubular stapler according to claim 1 is characterized in that the proximal end of the curved portion includes a first matching portion, and the distal end of the nail pushing rod includes a second matching portion, and when the curved portion is retracted inward, the first matching portion of the curved portion is embedded in the second matching portion of the nail pushing rod.

6. The circular tubular stapler according to claim 5 is characterized in that the first matching portion includes a protrusion provided on the curved portion and facing the anvil shaft, and the second matching portion includes a groove corresponding to the protrusion, and when the curved portion is retracted inwardly, the protrusion is embedded in the groove.

7. The circular tubular stapler according to claim 6, characterized in that the groove at the distal end of the nail pushing rod includes a plurality of grooves corresponding one-to-one to the firing plates.

8. The circular tubular stapler according to claim 6, characterized in that the groove at the distal end of the nail pushing rod is a concave ring surrounding the nail pushing rod.

9. The circular tubular stapler according to claim 5 is characterized in that the second matching portion includes a protrusion provided on the nail pushing rod and facing outward, the first matching portion includes a groove corresponding to the protrusion, and when the curved portion is retracted inwardly, the protrusion is embedded in the groove.

10. The circular tubular stapler according to claim 1, characterized in that the warped portion is an elastic member.

11. The circular tubular stapler according to claim 1, characterized in that the stapler further comprises an operating handle pivotally connected to the stapler body, and pressing the operating handle can drive the stapler pusher rod to move from the proximal end to the distal end of the stapler.

12. The circular tubular stapler according to claim 1 is characterized in that the stapler body further comprises a knob located at the proximal end of the stapler body, the knob being connected to the proximal end of the anvil shaft via a screw assembly, and when the knob rotates, the screw assembly drives the anvil shaft to move axially relative to the stapler body.