Circular tube stapler

Abstract

The present invention provides a circular tube type stapler, which includes a stapler body, the stapler body includes a stapler magazine assembly, a stapler pusher, a stapler pusher rod and a staple anvil shaft, a firing piece is provided at the proximal end of the stapler pusher, a curved portion is provided at the proximal end of the firing piece, and a fixing portion is provided on the staple anvil shaft. By adopting the present invention, when the distance between the staple anvil assembly and the staple magazine does not reach a suitable position, the fixing portion cooperating with the firing piece is located in a first position area, the stapler pusher rod and the stapler pusher plate are not linked, even if the operating handle is gripped, the stapler pusher rod will not push the stapler pusher plate, and will not cause misfiring, when the staple anvil assembly moves to a suitable position, the fixing portion is located in a second position area, the stapler pusher rod can be linked with the stapler pusher plate, at this time if the operating handle is gripped, the stapler pusher rod can push the stapler pusher plate to fire; therefore, the present invention prevents misfiring when the operation is not ready, while ensuring the normal operation of the stapler pusher rod and the stapler pusher plate, thereby improving the safety of the instrument.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a circular tubular stapler. Background Art

[0002] Digestive tract diseases are one of the most common diseases in humans. During the treatment process, circular tubular staplers are often used to replace the doctor's manual operation to anastomose physiological tissues such as the digestive tract. Circular tubular staplers are a common surgical instrument, most of which use axial internal stapling to form end-to-end or end-to-side anastomosis of physiological tissues such as the esophagus, stomach, and intestines during surgery. During the anastomosis, the two sections of tissue are contained inwardly in the stapler. After the firing is completed, a circular anastomosis is formed on the tissue, reconstructing the human body channel.

[0003] In the prior art, a circular tube-type stapler includes a stapler body, an operating handle movably connected to the stapler body, and a nail anvil assembly matched with the body. The stapler body includes a nail magazine assembly arranged at the distal end, the nail magazine assembly includes an annular nail magazine, a cutter; and a knob arranged at the proximal end of the body, the knob can rotate relative to the body, and the interior of the stapler body also includes a nail anvil shaft arranged from the proximal end to the distal end. Here, the distal end and the proximal end are relative to the operator, the end closer to the operator is the proximal end, and the end farther from the operator, that is, the end closer to the surgical site is the distal end. In the stapler, the inner side and the outer side are relative to the axis of the stapler, the side close to the axis is the inner side, and the side away from the axis is the outer side. The nail anvil assembly includes a nail anvil, a nail anvil cap arranged at the distal end of the nail anvil, and a knife anvil arranged inside the nail anvil. The nail anvil assembly can be directly connected to the distal end of the nail anvil shaft or connected through a nail anvil shaft connector. During tumor surgery, after the tumor tissue is cut off and removed, the anvil shaft passes through the purse of the residual tissue and is arranged at the distal end of the stapler body. The knob is rotated to gradually reduce the distance between the anvil assembly and the stapler to a suitable distance, and then the firing state is reached. Only then can the operating handle be held to fire the instrument to complete the anastomosis. With the continuous development of medical devices, circular tube staplers are also increasingly widely used in the treatment of diseases such as hemorrhoids.

[0004] As mentioned above, whether in tumor treatment or hemorrhoid treatment, before firing the stapler, the knob needs to be rotated to make the distance between the anvil assembly and the staple cartridge reach an appropriate distance. However, when a circular tube stapler is actually used for surgery, the operator may accidentally hold the operating handle when the distance between the anvil assembly and the staple cartridge is not at an appropriate position, causing misfiring, thereby causing failure of the surgery and even medical accidents. Summary of the invention

[0005] In view of the problems in the prior art, the purpose of the present invention is to provide a circular tubular stapler. When the distance between the anvil assembly and the staple magazine does not reach a suitable position, even if the operating handle is gripped, the staple push rod will not push the staple push plate, thereby preventing misfiring.

[0006] An embodiment of the present invention provides a circular tubular stapler, comprising a stapler body, wherein the stapler body comprises 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, wherein the proximal end of the nail pushing sheet comprises at least one firing sheet, and the stapler body further comprises an anvil shaft, wherein the anvil shaft is sequentially passed through the nail pushing sheet and the nail pushing rod, wherein a fixing portion is arranged on the anvil shaft, wherein the firing sheet is passed through the fixing portion and the anvil shaft, wherein the fixing portion can move between a first position region and a second position region, wherein the second position region is located at the proximal end side of the first position region;

[0007] When the fixing portion is located in the first position area, 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 nail pushing rod and the firing piece are linked, and the stapler can be fired.

[0008] Optionally, the fixing portion is a fixing ring surrounding the anvil shaft.

[0009] Optionally, at least one connecting block is provided on the fixing ring, the fixing ring is fixedly connected to the anvil shaft via the connecting block, the firing plates are at least two plates, and the connecting block is located between the firing plates.

[0010] Optionally, the fixing portion includes a plurality of fixing members, and 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.

[0011] Optionally, a curved portion is provided at the proximal end of the firing piece, and 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, but is tilted outward to form a cavity with the nail anvil shaft, and the nail pushing rod enters the cavity when moving from the proximal end to the distal end of the stapler;

[0012] 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 by the pressure of the fixing portion. When the stapler pusher moves from the proximal end to the distal end, it contacts and moves in conjunction with the curved portion.

[0013] Optionally, 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.

[0014] Optionally, the first matching portion includes a protrusion provided on the warped portion and facing the anvil shaft, and the second matching portion includes a groove corresponding to the protrusion, and when the warped portion is retracted inwardly, the protrusion is embedded in the groove.

[0015] Optionally, the groove at the distal end of the nail pushing rod includes a plurality of grooves corresponding one-to-one to the firing plates.

[0016] Optionally, the groove at the distal end of the nail pushing rod is a concave ring surrounding the nail pushing rod.

[0017] Optionally, the second matching portion includes a protrusion provided on the nail pushing rod and facing outward, and 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.

[0018] Optionally, the warping portion is an elastic member.

[0019] Optionally, the stapler further comprises an operating handle pivotally connected to the stapler body, and pressing the operating handle can drive the stapler pushing rod to move from the proximal end to the distal end of the stapler.

[0020] Optionally, 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.

[0021] The circular tubular stapler provided by the present invention has the following advantages:

[0022] The present invention provides a circular tube type stapler, when the distance between the nail anvil assembly and the nail magazine does not reach a suitable position, the fixed part matched with the firing plate is located in a first position area, at this time, the nail pushing rod and the nail pushing plate are not linked, even if the operating handle is gripped, the nail pushing rod will not push the nail pushing plate, and will not cause the stapler to fire accidentally, when the nail anvil assembly moves to a suitable position relative to the nail magazine, the fixed part is located in a second position area, the nail pushing rod and the nail pushing plate are linked, at this time, if the operating handle is gripped, the nail pushing rod can push the nail pushing plate to fire the stapler; therefore, the present invention prevents accidental firing when the operation is not ready, while ensuring the normal operation of the nail pushing rod and the nail pushing plate, thereby improving the safety of the instrument. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Other features, objectives and advantages of the present invention will become more apparent from a reading of the detailed description of non-limiting embodiments made with reference to the following accompanying drawings.

[0024] Figure 1 is a schematic structural diagram of a stapler according to an embodiment of the present invention;

[0025] Figure 2 is a schematic diagram of a stapler according to an embodiment of the present invention with one side of the housing removed;

[0026] Figure 3 is a schematic diagram of the cooperation between a pointer and a pull tab according to an embodiment of the present invention;

[0027] Figure 4 is a schematic structural diagram of an anvil shaft according to an embodiment of the present invention;

[0028] Figure 5 is a schematic diagram of the cooperation between the nail pushing sheet and the nail pushing rod in the initial state of one embodiment of the present invention;

[0029] Figure 6 yes Figure 5 A1 in the middle is an enlarged view;

[0030] Figure 7 is a cross-sectional view of the nail pushing piece and the nail pushing rod in a failure protection state in one embodiment of the present invention;

[0031] Figure 8 yes Figure 7 A2 in the middle is an enlarged view;

[0032] Fig. 9 It is a schematic diagram of the cooperation between the nail pushing sheet and the nail pushing rod in a normal working state according to an embodiment of the present invention;

[0033] Fig.10 It is a cross-sectional view of the nail pushing sheet and the nail pushing rod in cooperation with each other in a normal working state according to an embodiment of the present invention;

[0034] Fig.11 yes Fig.10 Enlarged view of A3 in the middle.

[0035] Reference numerals:

[0036] 1 Stapler body housing 52 Screw assembly

[0037] 2 Nail magazine assembly 53 pointer

[0038] 3 Push-nail piece 54 Pull-tab

[0039] 31 nail pusher 6 nail anvil shaft

[0040] 32 firing piece 61 fixing ring

[0041] 321 warping portion 62 connecting block

[0042] 322 Raised 7 Handle

[0043] 4 Push rod 8 Anvil assembly

[0044] 41 groove 81 anvil

[0045] 42 proximal end of the nail push rod 82 nail anvil shaft connecting piece

[0046] 51 Knob DETAILED DESCRIPTION

[0047] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their repeated description will be omitted.

[0048] In order to solve the technical problems in the prior art, the present invention provides a circular tube type stapler, the circular tube type stapler includes a stapler body, wherein the stapler body includes a nail pushing rod, a nail pushing sheet and a nail magazine assembly arranged in sequence from the proximal end to the distal end of the stapler body, the proximal end of the nail pushing sheet includes at least one firing sheet, the stapler body also includes a nail anvil shaft, the nail anvil shaft is sequentially inserted in the nail pushing sheet and the nail pushing rod, a fixing portion is arranged on the nail anvil shaft, the firing sheet is inserted between the fixing portion and the nail anvil shaft, the fixing portion can move between a first position area and a second position area, and the second position area is located on the proximal side of the first position area. When the stapler is in an initial state and has not reached a firing state, the fixing portion is located in the first position area, and the first position area is close to the distal end of the stapler.

[0049] When the fixing portion is located in the first position area, 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 nail pushing rod and the firing piece are linked, and the stapler can be fired.

[0050] Furthermore, the stapler may also include an anvil assembly, the anvil assembly including an anvil, the anvil may be connected to the distal end of the anvil shaft via an anvil shaft connector, or the anvil may be directly connected to the distal end of the anvil shaft. When the anvil shaft moves along the axial direction of the stapler, the anvil assembly is driven to move along the axial direction of the stapler, so that the anvil assembly moves away from or close to the staple cartridge.

[0051] In one embodiment of the present invention, a curved portion is provided at the proximal end of the firing plate, and the curved portion naturally opens outward relative to the anvil shaft when no external force is applied.

[0052] When the anvil assembly of the circular tubular stapler is in the initial state where it has just been successfully docked with the stapler body, the distance between the anvil assembly and the stapler magazine is relatively large. At this time, the distance between the anvil assembly and the stapler magazine has not reached a suitable position. The fixing portion is located in a first position area closer to the distal end of the stapler. 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, but is tilted outward to form a cavity between the anvil shaft and the nail push rod. When the nail push rod moves from the proximal end to the distal end of the stapler, it enters the cavity without being linked with the firing piece. At this time, even if the operator accidentally presses the handle to fire the nail push rod, the stapler will not be fired, thereby avoiding accidental firing when the operation is not ready.

[0053] When preparing for surgery, the knob is turned so that the anvil shaft drives the anvil assembly to move toward the proximal end of the stapler. When the distance between the anvil assembly and the staple magazine reaches a suitable position, the fixed portion moves from the first position area to the second position area, and the curved portion enters between the fixed portion and the anvil shaft and is retracted inwardly by the pressure of the fixed portion. When the stapler push rod moves from the proximal end to the distal end of the stapler, it contacts the curved portion and is linked to the firing piece. At this time, if the operator presses the handle to fire the stapler push rod, the stapler will be fired, thereby realizing the normal function of the stapler. That is, the force of the handle will be transmitted to the stapler push rod by the firing rod, causing the instrument to fire.

[0054] The structure of a circular tubular stapler according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0055] like Figure 1 and Figure 2 FIG. 1 is a diagram showing the structure of a stapler according to an embodiment of the present invention, wherein in order to more clearly show the internal structure of the stapler, Figure 2In the figure, one side of the stapler housing is removed, and the stapler assembly is separated from the stapler body. The stapler includes a stapler body and a staple anvil assembly 8. The stapler body includes a stapler housing 1 and a stapler assembly 2 located at the distal end of the stapler housing 1. The stapler assembly 2 includes an annular stapler and a cutter. The stapler assembly 2 is provided with a staple pusher 3 and a staple pusher rod 4. When the staple pusher rod 4 is linked with the staple pusher 3, the movement of the staple pusher rod 4 toward the distal end of the stapler can drive the staple pusher 3 to move toward the distal end of the stapler. When the staple pusher 3 moves toward the distal end of the stapler, the staples and the cutter in the stapler assembly 2 can be pushed out to staple and cut the tissue. The stapler body also includes a staple anvil shaft 6 arranged from the proximal end to the distal end, and the staple anvil shaft 6 is penetrated by the staple pusher rod 4 and the staple pusher 3. The anvil assembly 8 includes an anvil shaft connector 82 and an anvil 81 disposed at the distal end of the anvil shaft connector 82, and the proximal end of the anvil shaft connector 82 is connected to the distal end of the anvil shaft 6. When the anvil assembly 8 is docked with the stapler body, the anvil shaft 6 can drive the anvil 81 to move along the axial direction of the anvil shaft 6 through the anvil shaft connector 82, so that the anvil assembly 8 is close to or away from the staple cartridge assembly 2.

[0056] Of course, in another type of circular tube stapler, such as the circular tube stapler for hemorrhoid surgery mentioned above, the anvil assembly 8 is directly connected to the stapler body, and the anvil assembly 8 cannot be removed from the stapler body. In this case, 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 is described by taking this type of stapler as an example.

[0057] In the present invention, the distal end and the proximal end are relative to the operator. The end closer to the operator is the proximal end, and the end farther from the operator, that is, the end closer to the surgical site is the distal end. That is, in this embodiment, since the operator holds the handle to operate the stapler, Figure 1 and Figure 2 For example, for the nail pushing rod 4, the proximal end 42 of the nail pushing rod 4 is the end that is biased to the right relative to the distal end of the nail pushing rod 4, and for the nail pushing sheet 3, the proximal end of the nail pushing sheet 3 is the end that is biased to the right relative to the distal end of the nail pushing sheet 3.

[0058] In this embodiment, the stapler also includes 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 stapler push rod 4, and the rotation of the operating handle 7 toward the stapler body can drive the stapler push rod 4 to move from the proximal end to the distal end of the stapler.

[0059] The proximal end of the stapler body is further provided with a knob 51, which is connected to the proximal end of the anvil shaft 6 via a screw assembly 52. ​​When the knob 51 rotates, the screw assembly 52 drives the anvil shaft 6 to move axially relative to the stapler body.

[0060] Figures 1-2 The structure of the circular tubular stapler shown in the figure is only an example. In actual applications, the structure of the circular tubular stapler is not limited to the structure shown in the figure, and other forms can also be adopted as long as the stapler can be fired, which falls within the protection scope of the present invention.

[0061] like Figure 3 As shown, further, in this embodiment, the stapler body further includes a pointer 53 and a pull tab 54 located inside the stapler body, and the proximal end of the pull tab 54 is connected to the screw assembly 52, and can move along the axial direction of the screw assembly 52 as the screw assembly 52 moves. The distal end of the pull tab 54 is opposite to the first end of the pointer 53, and the first end of the pointer 53 has a third position area and a fourth position area. Here, the first end of the pointer 53 refers to Figure 3 The upper end of the middle pointer 53. The pointer 53 is pivotally fixed to the stapler housing 1, and when the pointer 53 rotates, its first end can move between the third position area and the fourth position area.

[0062] In this embodiment, when the knob 51 rotates in the first direction, the screw assembly 52 drives the pull tab 54 to move toward the proximal end 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 area generally refers to the initial position area of ​​the pointer 53. At this time, the distance between the stapler assembly 2 and the anvil assembly 8 is far and has not reached the appropriate position. Therefore, the third position area is also a non-firing area. As the knob 51 rotates 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 stapler assembly 2 reaches the appropriate position. At this time, the pointer 53 is also pulled by the pull tab 54 to the fourth position area. At this time, the operator is allowed to fire the stapler, so the fourth position area is also called the firing area. Therefore, the pointer 53 can be used as an indicator of the position of the anvil shaft 6 to indicate whether the stapler has completed the surgical preparation and is allowed to fire.

[0063] The movement mode and position indication mode of the anvil shaft 6 are only examples and are not intended to be limiting of the present invention. For example, the axial movement of the anvil shaft 6 may be driven by other components, not necessarily by the knob 51 and the screw assembly 52 of the present invention, and the position of the anvil shaft 6 may not necessarily be indicated by the pointer 53. Other modes may be used to indicate whether the anvil shaft 6 and the anvil 81 have reached the firing position, or no visual indication may be used.

[0064] In order to prevent the stapler from being fired accidentally when the anvil 81 is not moved to a suitable position, the present invention further improves the anvil shaft 6, the nail pushing plate 3 and the nail pushing rod 4. Figure 4 As shown, a fixing portion is provided on the anvil shaft 6. In this embodiment, the fixing portion is an annular fixing ring 61, which is sleeved on the anvil shaft 6. The fixing ring 61 is fixed to the anvil shaft 6 through a connecting block 62. When the anvil shaft 6 moves toward the proximal end of the stapler, the fixing ring 61 can move with the anvil shaft 6 from the first position area to the second position area.

[0065] like Figures 5 to 8 As shown (the anvil is omitted in the figure), the stapler is in the initial state where the anvil assembly 8 and the stapler body have just been successfully docked. There is a large distance between the anvil assembly 8 and the stapler magazine assembly 2, that is, the anvil assembly 8 and the stapler magazine have not reached a suitable position, and the fixing ring 61 is located in the first position area. The nail pushing piece 3 includes a nail pushing portion 31 located at the distal end of the nail pushing piece 3 and a firing piece 32 located at the proximal end of the nail pushing piece 3. The nail pushing portion 31 and the firing piece 32 can be integrally formed, but the present invention is not limited to this. It is also possible to use two separate parts and then fix them together. The number of firing pieces 32 can be selected as needed, such as two, four, six, etc., all of which are within the scope of protection of the present invention. The proximal end of the firing piece 32 is provided with a warped portion 321, which is naturally opened outward when not subjected to external force. Here, opening outward refers to opening outward relative to the axis of the anvil shaft 6.

[0066] In this embodiment, the warped portion 321 may be an elastic member, and has a pre-bent shape toward the outside. When not subjected to external force, the warped portion 321 maintains its initial shape and opens toward the outside. When subjected to pressure, it can change its shape according to the direction of the pressure. After the pressure is eliminated, the warped portion 321 can return to its initial shape. In other embodiments, the warped portion 321 may not be set as an elastic member, but a component pivotally connected to the proximal end of the firing piece 32, and a reset mechanism is set at the pivot connection. The reset mechanism may be a torsion spring. In the initial state, when the torsion spring is not deformed, the warped portion 321 has a certain rotation angle relative to the firing piece 32, that is, it opens toward the outside relative to the nail anvil shaft 6. When subjected to external force, it can be retracted toward the inside relative to the nail anvil shaft 6. At this time, the torsion spring will be deformed. After the external force is eliminated, it can return to its initial state due to the restoring force of the torsion spring. It can be understood that the nail pushing piece 3 has a certain strength as a whole, so as to effectively transmit force to fire the stapler.

[0067] When the fixing ring 61 is located in the first position area, after the curved portion 321 passes through the cavity between the fixing ring 421 and the nail anvil shaft 6, the curved portion 321 is extended from the proximal side of the fixing ring 421. Figure 5 The curved portion 321 is not subjected to the pressure of the fixing ring 421 and opens outward naturally. At this time, if the stapler push rod 4 moves toward the distal end of the stapler, it will enter the cavity between the curved portion 321 and the anvil shaft 6, and will not drive the firing piece 32 or even the stapler push piece 3 to fire the stapler. Therefore, the stapler is in a failure protection state at this time, avoiding accidental firing when the anvil and the stapler magazine are not in the proper position before the operation is ready.

[0068] In this embodiment, the fixing portion is a fixing ring 61 surrounding the anvil shaft 6. In other embodiments, the fixing portion may not be an annular structure, but may include a plurality of fixing members, the plurality of fixing members corresponding to the firing pieces one by one, and the proximal end of the firing piece is inserted between the corresponding fixing member and the anvil shaft. When the fixing member is in the first position area, the warped portion of each firing piece passes through the corresponding fixing member and extends from the proximal end side of the corresponding fixing member.

[0069] like Figures 9 to 11 As shown, 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 at this time, the distance between the anvil and the stapler reaches a suitable position. The curved portion 321 enters between the fixing ring 61 and the anvil shaft 6 and is retracted inwardly by the pressure of the fixing ring 61. When the nail push rod 4 moves from the proximal end to the distal end of the stapler, it contacts the curved portion 321 and then cooperates with the firing plate 32 through the cooperation with the curved portion 321. At this time, if the operator holds the handle 7 to fire the nail push rod 4 from the proximal end to the distal end of the stapler, it will also push the nail push plate 3 to push out the stapler and the cutter in the stapler assembly 2 to perform tissue suturing and cutting, thereby realizing the firing of the stapler.

[0070] In this embodiment, when the pointer 53 is used to indicate the position of the anvil shaft 6 and the anvil 81, when 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 toward the proximal end of the stapler body, so that the fixing ring 61 moves from the first position area to the second position area. Therefore, the operator can judge whether the current anvil 81 and the stapler assembly 2 have reached a suitable position according to the position of the first end of the pointer 53. When the first end of the pointer 53 reaches the fourth position area, the stapler can be fired by pressing the handle 7 to perform the operation, and when the first end of the pointer 53 reaches the third position area, even if the operator accidentally presses the handle 7, since the stapler is in a failure protection state, it will not push the stapler pusher 3 and then fire the stapler, thereby avoiding the failure of the operation caused by misfiring.

[0071] There are many ways to match the warped portion 321 with the distal end of the nail pushing rod 4. In this embodiment, the proximal end of the warped portion 321 includes a first matching portion, and the distal end of the nail pushing rod 4 includes a second matching portion. When the warped portion 321 is retracted inward, the first matching portion of the warped portion 321 is embedded in the second matching portion of the nail pushing rod 4, and enters the path of the nail pushing rod 4 moving from the proximal end to the distal end.

[0072] like Fig.11 As shown, the first matching portion includes a protrusion 322 of the curved portion 321 facing the anvil shaft 6, and the second matching portion includes a groove 41 corresponding to the protrusion 322. When the curved portion 321 is retracted inward, the protrusion 322 of the curved portion 321 is embedded in the groove 41 of the nail pushing rod 4. In this embodiment, the groove 41 at the far end of the nail pushing rod 4 may include a plurality of grooves 41 corresponding to the firing plate 32 one by one. The structure of the groove 41 can be seen in Figure 6 In the embodiment, the groove 41 can be opened to be slightly larger than the protrusion 322 of the curved portion 321. In other embodiments, the groove 41 at the distal end of the nail pushing rod 4 can also be a concave ring surrounding the nail pushing rod 4.

[0073] In other embodiments, the second matching portion may also include a protrusion of the nail pushing rod facing outward, and the first matching portion may include a groove corresponding to the protrusion. That is, compared with the previous embodiment, the protrusion is provided on the nail pushing rod, and the groove is provided on the firing plate. When the curved portion is retracted inward, the protrusion of the nail pushing rod is embedded in the groove of the curved portion.

[0074] The circular tubular stapler provided by the present invention has the following advantages:

[0075] The present invention provides a circular tube type stapler, when the distance between the nail anvil assembly and the nail magazine does not reach a suitable position, the curved portion at the proximal end of the firing piece extends out of the fixed portion and opens naturally due to no external force, so the curved portion is separated from the nail pushing rod. At this time, the nail pushing rod and the nail pushing piece are not linked, and even if the operating handle is gripped, the nail pushing rod will not push the nail pushing piece, and will not cause misfiring. When the nail anvil assembly moves to a suitable position relative to the nail magazine, the curved portion at the proximal end of the firing piece enters the fixed portion and is retracted inwardly by the pressure of the fixed portion, and the curved portion is thereby matched with the nail pushing rod, so that the nail pushing rod and the nail pushing piece are linked, and at this time, if the operating handle is gripped, the nail pushing rod can push the nail pushing piece to fire; therefore, the present invention prevents misfiring when the operation is not ready, while ensuring the normal operation of the nail pushing rod and the nail pushing piece, thereby improving the safety of the instrument.

[0076] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A cylindrical stapler, comprising a stapler body, wherein the stapler body comprises 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, wherein the proximal end of the nail pushing sheet comprises at least one firing sheet, and the stapler body further comprises a nail anvil shaft, wherein the nail anvil shaft is sequentially arranged in the nail pushing sheet and the nail pushing rod, wherein: The proximal end of the firing piece is provided with a curved portion, the anvil shaft is provided with a fixed portion, the firing piece is inserted between the fixed portion and the anvil shaft, the fixed portion can move between a first position area and a second position area, and the second position area is 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, characterized in that: The fixing portion is a fixing ring surrounding the anvil shaft.

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

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

5. The circular tubular stapler according to claim 1, 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. 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, characterized in that: The first matching portion includes a protrusion disposed on the curved portion and facing the anvil shaft, and the second matching portion includes a groove corresponding to the protrusion. 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 with 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, characterized in that: The second matching portion includes a protrusion which is arranged on the nail pushing rod and faces outward, and the first matching portion includes a groove corresponding to the protrusion. When the curved portion is retracted inward, the protrusion is embedded in the groove.

10. The circular tubular stapler according to claim 1, characterized in that: The warping 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 pushing rod to move from the proximal end to the distal end of the stapler.

12. The circular tubular stapler according to claim 1, characterized in that: The stapler body also includes a knob located at the proximal end of the stapler body, and the knob is connected to the proximal end of the anvil shaft through a screw assembly. When the knob rotates, the screw assembly drives the anvil shaft to move axially relative to the stapler body.

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