Circular tube stapler

Abstract

The present invention provides a circular tube type stapler, which includes a stapler body, the stapler body includes a nail pushing piece, a nail pushing rod and a nail anvil shaft, the nail anvil shaft is sequentially inserted in the nail pushing piece and the nail pushing rod, and the nail anvil shaft includes a first nail anvil shaft portion with a smaller outer diameter at the distal end and a second nail anvil shaft portion with a larger outer diameter at the proximal end. By adopting the present invention, when the distance between the nail anvil assembly and the nail magazine does not reach a suitable position, the distal end of the firing piece on the nail pushing piece is located on the second nail anvil shaft portion, the nail pushing rod and the nail pushing piece are not linked, even if the operating handle is gripped, the nail pushing rod will not push the nail pushing piece, and the stapler will not be fired. Only when the nail anvil assembly moves to a suitable position relative to the nail magazine, the nail pushing rod and the nail pushing piece are linked, and the nail pushing rod can push the nail pushing piece to fire the stapler; thereby, under the premise of ensuring normal operation, misfiring when the operation is not ready is prevented, 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 hemorrhoids and other diseases.

[0004] As mentioned above, whether in tumor surgery or hemorrhoid treatment, before firing the stapler, it is necessary to rotate the knob to make the distance between the anvil assembly and the staple cartridge reach an appropriate distance. However, when the 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 surgery failure 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] The embodiment of the present invention provides a circular tubular stapler, the circular tubular stapler comprising a stapler body, the stapler body comprising a stapler pushing rod, a stapler pushing sheet and a stapler cartridge assembly arranged in sequence from the proximal end to the distal end thereof, the stapler pushing sheet comprising at least one firing sheet;

[0007] The stapler body further comprises an anvil shaft, which is sequentially inserted into the stapler pushing plate and the stapler pushing rod, and comprises a first anvil shaft portion disposed at its distal end and a second anvil shaft portion disposed at its proximal end, wherein the outer diameter of the first anvil shaft portion is smaller than the outer diameter of the second anvil shaft portion, and the anvil shaft can move along the axial direction of the stapler;

[0008] When the distal end of the firing piece is located at the second anvil shaft, the nail pushing rod is not linked with the firing piece, and the stapler cannot be fired; when the distal end of the firing piece is located at the first anvil shaft, the nail pushing rod is linked with the firing piece, and the stapler can be fired.

[0009] Optionally, a boss is provided on the inner wall of the distal end of the firing piece, and the boss of the firing piece is in contact with the anvil shaft.

[0010] Optionally, the nail pushing piece further includes a nail pushing portion, the distal end of the firing piece is connected to the proximal end of the nail pushing portion, and the distal end of the firing piece is an elastic portion.

[0011] Optionally, when the distal end of the firing plate is located at the second anvil shaft portion, the proximal end of the firing plate opens outward relative to the anvil shaft to form a cavity with the anvil shaft, and the staple push rod enters the cavity when moving from the proximal end to the distal end of the stapler;

[0012] When the distal end of the firing piece is located at the first anvil shaft portion, the proximal end of the firing piece is retracted inwardly relative to the anvil shaft and contacts and operates in conjunction with the proximal end of the firing piece.

[0013] Optionally, the proximal end of the firing plate includes a first matching portion, and the distal end of the nail pushing rod includes a second matching portion, and when the proximal end of the firing plate is retracted axially inward relative to the anvil, the first matching portion is engaged with the second matching portion.

[0014] Optionally, the first mating portion includes a protrusion facing the anvil axis, and the second mating portion includes a groove corresponding to the protrusion, and when the proximal end of the firing plate is retracted inwardly relative to the anvil axis, the protrusion of the firing plate is embedded in the groove of the nail pushing rod.

[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 facing outward, and the first matching portion includes a groove corresponding to the protrusion, and when the proximal end of the firing plate is retracted axially inward relative to the anvil, the protrusion of the nail pushing rod is embedded in the groove of the firing plate.

[0018] Optionally, a connecting portion is provided between the first anvil shaft portion and the second anvil shaft portion, and a surface of the connecting portion is a transition surface.

[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 anvil shaft is driven to move axially along the stapler via the screw assembly.

[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 distal end of the firing piece on the nail pushing piece is sleeved on the second nail anvil shaft portion with a relatively large outer diameter, at this time, the nail pushing rod and the nail pushing piece are not linked, even if the operating handle is gripped, the nail pushing rod will not push the nail pushing piece, 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 distal end of the firing piece is sleeved on the first nail anvil shaft portion with a relatively small outer diameter, the nail pushing rod and the nail pushing piece are linked, 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 accidental firing 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 use 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 2is 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 yes Figure 4 Enlarged view of point A in the middle;

[0029] Figure 6 It is a structural schematic diagram of a nail pushing piece according to an embodiment of the present invention;

[0030] Figure 7 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;

[0031] Figure 8 is a schematic diagram of the cooperation between the nail pushing sheet and the nail pushing rod in a failure protection mode of an embodiment of the present invention;

[0032] Fig. 9 It is a schematic diagram of the nail pushing rod and the nail pushing sheet in linkage according to one embodiment of the present invention.

[0033] Reference numerals:

[0034] 1 Stapler body housing 52 Screw assembly

[0035] 2 Nail magazine assembly 53 pointer

[0036] 3 Push-nail piece 54 Pull-tab

[0037] 31 nail pusher 6 nail anvil shaft

[0038] 32 firing piece 61 first anvil shaft

[0039] 321 boss 62 second anvil shaft

[0040] 322 protrusion 63 connection part

[0041] 4 Push rod 7 Operating handle

[0042] 41 groove 8 nail anvil assembly

[0043] 42 Proximal end of the push rod 81 Anvil

[0044] 51 Knob 82 Anvil shaft connector DETAILED DESCRIPTION

[0045] 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.

[0046] In order to solve the technical problems in the prior art, the present invention provides a circular tubular stapler, which includes a stapler body, wherein the stapler body includes a nail pushing rod, a nail pushing plate and a nail magazine assembly which are sequentially arranged from the proximal end to the distal end of the stapler body, the stapler body also includes an anvil shaft which is arranged from the proximal end to the distal end of the stapler body, the nail pushing plate includes at least one firing plate, the anvil shaft is sequentially penetrated through the nail pushing plate and the nail pushing rod, the anvil shaft includes a first anvil shaft portion located at the distal end of the anvil shaft and a second anvil shaft portion located at the proximal end of the anvil shaft, the outer diameter of the first anvil shaft portion is smaller than the outer diameter of the second anvil shaft portion, and the anvil shaft can move along the axial direction of the stapler.

[0047] 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.

[0048] When the distal end of the firing piece is located at the second anvil shaft portion, the nail pushing rod is not linked with the firing piece, and the stapler cannot be fired;

[0049] When the distal end of the firing piece is located at the first anvil shaft portion, the nail pushing rod is linked with the firing piece, and the stapler can be fired.

[0050] Specifically, in one embodiment of the present invention, in the initial state when the anvil assembly of the circular tubular stapler and the stapler body have just been successfully docked, the distance between the anvil assembly and the stapler magazine is large. At this time, the distance between the anvil assembly and the stapler magazine has not reached a suitable position, and the distal end of the firing plate is sleeved on the second anvil shaft portion, and the proximal end of the firing plate is opened outward relative to the anvil shaft 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 formed by the proximal end of the firing plate. At this time, the force of the handle cannot be applied to the nail pushing plate through the firing rod. Therefore, the nail pushing rod and the nail pushing plate with the firing plate are not linked. At this time, even if the operator accidentally presses the handle to fire the nail pushing rod, it will not cause the stapler to fire, thereby avoiding accidental firing when the operation is not ready.

[0051] 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 cartridge reaches a suitable position, the distal end of the firing piece moves from the second anvil shaft portion to the first anvil shaft portion, and the proximal end of the firing piece is retracted inward relative to the anvil shaft. When the nail pushing rod moves from the proximal end to the distal end of the stapler, it contacts the proximal end of the firing piece and then links with the firing piece. At this time, if the operator presses the handle to fire the nail pushing rod, the stapler will be fired, thereby realizing the normal function of the stapler. That is, during linkage, the force of the handle can be transmitted to the nail pushing piece through the firing rod, thereby causing the nail pushing piece to move toward the distal end.

[0052] 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.

[0053] 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 2 In 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. The staple pusher 3 is located at the distal end of the stapler 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. In one type of cylindrical stapler, 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 can be connected to the distal end of the anvil shaft 6. When the anvil assembly 8 is docked with the stapler body, the anvil shaft connector 82 can drive the anvil 81 to move along the axial direction of the anvil shaft connector 82, so that the anvil assembly 8 is close to or away from the staple cartridge assembly 2.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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 first position area and a second 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 first position area and the second position area.

[0060] 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 first position area to the second position area. In practice, the first 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 first 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 second position area. At this time, the operator is allowed to fire the stapler, so the second 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.

[0061] 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.

[0062] 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 5 As shown, in this embodiment, the anvil shaft 6 includes a first anvil shaft portion 61 and a second anvil shaft portion 62, wherein the first anvil shaft portion 61 is located at the distal end of the anvil shaft 6, and the second anvil shaft portion 62 is located at the proximal end of the anvil shaft 6. The outer diameter D1 of the first anvil shaft portion 61 is smaller than the outer diameter D2 of the second anvil shaft portion 62. Figure 6 As shown, the nail pushing piece 3 includes a nail pushing portion 31 located at the distal end of the nail pushing piece 3 and at least one firing piece 32 located at the proximal end of the nail pushing piece 3. The distal end of the firing piece 32 is connected to the proximal end of the nail pushing portion 31. In this embodiment, the nail pushing portion 31 and the firing piece 32 are integrally formed, but the present invention is not limited thereto. The number of firing pieces 32 can be selected as needed, such as two, four, six, etc., all of which fall within the protection scope of the present invention. The area where the first anvil shaft portion 61 and the second anvil shaft portion 62 intersect is Figure 4 and Figure 5 Area A in .

[0063] Since the outer diameter D1 of the first anvil shaft portion 61 is smaller than the outer diameter D2 of the second anvil shaft portion 62, the distal end of the firing piece 32 will be in different states when it is sleeved on the first anvil shaft portion 61 and when it is sleeved on the second anvil shaft portion 62. Figure 5 As shown, in this embodiment, a connecting portion 63 may be further included between the first anvil shaft portion 61 and the second anvil shaft portion 62, and the surface of the connecting portion 63 is a transition slope inclined toward the second anvil shaft portion 62. The connecting portion 63 can well guide the nail pushing piece 3 to move between the first anvil shaft portion 61 and the second anvil shaft portion 62. The connecting portion 63 is not limited to a slope, and may also be other shapes that can achieve a transition function, such as a curved surface.

[0064] Combine the following Figure 7 to Figure 9 (The anvil is omitted in the figure) The states of the stapler when the distal end of the firing piece 32 is sleeved on the first anvil shaft portion 61 and sleeved on the second anvil shaft portion 62 are respectively introduced.

[0065] like Figure 7 As shown, at this time, the area A where the first anvil shaft portion 61 and the second anvil shaft portion 62 intersect is located on the left side of the nail pushing piece 3. When the distal end of the firing piece 32 is sleeved on the second anvil shaft portion 62, the firing piece 32 is stretched open due to the larger outer diameter D2 of the second anvil shaft portion 62, and the proximal end of the firing piece 32 is stretched outward relative to the anvil shaft 6. In this embodiment, a boss 321 facing the axial direction of the anvil shaft 6 is also provided at the distal end of the firing piece 32, and the boss 321 contacts the second anvil shaft portion 62, thereby stretching the proximal end of the firing piece 32 outward.

[0066] like Figure 8 As shown, in Figure 7 In this state, if the nail pushing rod 4 moves from the proximal end to the distal end of the stapler, the nail pushing rod 4 will enter the cavity between the proximal end of the firing plate 3 and the anvil shaft 6, that is, it is in the failure protection mode at this time. Even if the operator accidentally presses the handle 7 and pushes the nail pushing rod 4 from the proximal end to the distal end of the stapler, it will not push the nail pushing plate 3 and then fire the stapler, thus forming a failure protection state.

[0067] like Fig. 9 As shown, compared to Figure 7In the state, the anvil shaft 6 moves relative to the stapler body toward the proximal end of the stapler body, and the area A at the junction of the first anvil shaft portion 61 and the second anvil shaft portion 62 enters the interior of the nail pushing piece 3. The distal end of the firing piece 32 moves from the second anvil shaft portion 62 to the first anvil shaft portion 61, and the boss 321 at the distal end of the firing piece 32 contacts the first anvil shaft portion 61. Since the outer diameter D1 of the first anvil shaft portion 61 is small, the proximal end of the firing piece 32 is retracted inwardly relative to the anvil shaft 6 and enters the path where the nail pushing rod 4 moves from the proximal end to the distal end. When the nail pushing rod 4 moves from the proximal end to the distal end of the stapler, it contacts the proximal end of the firing piece 32 and then moves in conjunction with the firing piece 32. At this time, pressing the handle 7 can drive the nail pushing piece 3 through the nail pushing rod 4 to complete the firing of the stapler.

[0068] In this embodiment, the portion where the distal end of the firing piece 32 is connected to the nail pushing portion 31 is an elastic portion, so as to realize the opening and closing of the proximal end of the firing piece 32 relative to the nail anvil shaft 6. Alternatively, the distal end of the firing piece 32 can be pivotally connected to the proximal end of the nail pushing portion 31, that is, the distal end of the firing piece 32 can rotate around the rotation axis relative to the proximal end of the nail pushing portion 31, so as to realize the opening and closing of the proximal end of the firing piece 32 relative to the nail anvil shaft 6. The connection between the firing piece 32 and the nail pushing portion 31 can be in other ways, all of which fall within the scope of protection of the present invention. It can be understood that the nail pushing piece 3 has a certain strength as a whole, so as to stably transmit force and realize the firing of the stapler.

[0069] In this embodiment, if a pointer 53 is used to indicate the position of the anvil shaft 6, when the first end of the pointer 53 is located in the first position area, the distal end of the firing piece 32 is sleeved on the second anvil shaft portion 62, and the stapler is in a failure protection state; when the first end of the pointer 53 moves from the first position area to the second position area, the anvil shaft 6 moves toward the proximal direction of the stapler body, so that the distal end of the firing piece 32 moves from the second anvil shaft portion 62 to the first anvil shaft portion 61, and if the handle 7 is pressed at this time, the stapler can be fired normally.

[0070] There are many ways to match the proximal end of the firing piece 32 and the distal end of the nail pushing rod 4. In this embodiment, the proximal end of the firing piece 32 includes a first matching portion, and the distal end of the nail pushing rod 4 includes a second matching portion. When the proximal end of the firing piece 32 is retracted inwardly relative to the nail anvil shaft 6, the first matching portion is engaged with the second matching portion to achieve the linkage between the nail pushing rod 4 and the firing piece 32 and even the nail pushing piece 3.

[0071] In this embodiment, the first matching portion includes a protrusion 322 facing the anvil shaft 6, and the second matching portion includes a groove 41 corresponding to the protrusion 322. When the proximal end of the firing plate 32 is retracted inward relative to the anvil shaft 6, the protrusion 322 of the firing plate 32 is embedded in the groove 41 of the nail pushing rod 4. The groove 41 at the distal end of the nail pushing rod 4 may include a plurality of grooves 41 corresponding to the firing plates 32 one by one, and each groove 41 may be slightly larger than the protrusion 322 of the firing plate 32. In other embodiments, the groove 41 at the distal end of the nail pushing rod 4 may be directly set as a concave ring surrounding the nail pushing rod 4.

[0072] In other embodiments, the second matching portion may also include a protrusion 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 proximal end of the firing plate is retracted inwardly relative to the anvil axis, the protrusion of the nail pushing rod is embedded in the groove of the firing plate.

[0073] The circular tubular stapler provided by the present invention has the following advantages:

[0074] 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 distal end of the firing piece is sleeved on the second nail anvil shaft portion with a relatively large outer diameter, and the proximal end of the firing piece is stretched open and separated from the nail pushing rod. At this time, the nail pushing rod and the nail pushing piece are not linked. 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 distal end of the firing piece is sleeved on the first nail anvil shaft portion with a relatively small outer diameter, and the proximal end of the firing piece is closed and contacts and cooperates with the nail pushing rod, so that the nail pushing rod and the nail pushing piece are linked. 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.

[0075] 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 circular tubular stapler, characterized in that: The circular tube-type stapler comprises a stapler body, wherein the stapler body comprises a stapler push rod, a stapler push plate and a stapler cartridge assembly arranged in sequence from the proximal end to the distal end thereof, wherein the stapler push plate comprises at least one firing plate; The stapler body further comprises an anvil shaft, which is sequentially inserted into the stapler pushing plate and the stapler pushing rod, and comprises a first anvil shaft portion disposed at its distal end and a second anvil shaft portion disposed at its proximal end, wherein the outer diameter of the first anvil shaft portion is smaller than the outer diameter of the second anvil shaft portion, and the anvil shaft can move along the axial direction of the stapler; When the distal end of the firing piece is located at the second anvil shaft portion, the proximal end of the firing piece is opened outwardly relative to the anvil shaft to form a cavity with the anvil shaft, and 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 is not linked with the firing piece, and the stapler cannot be fired; when the distal end of the firing piece is located at the first anvil shaft portion, the proximal end of the firing piece is retracted inwardly relative to the anvil shaft, contacts and links with the proximal end of the firing piece, and the stapler can be fired.

2. The circular tubular stapler according to claim 1, characterized in that: The inner wall of the distal end of the firing piece is provided with a boss, and the boss of the firing piece is in contact with the anvil shaft.

3. The circular tubular stapler according to claim 1, characterized in that: The nail pushing piece also includes a nail pushing portion, the distal end of the firing piece is connected to the proximal end of the nail pushing portion, and the distal end of the firing piece is an elastic portion.

4. The circular tubular stapler according to claim 1, characterized in that: The proximal end of the firing piece includes a first matching portion, and the distal end of the nail pushing rod includes a second matching portion. When the proximal end of the firing piece is retracted axially inwardly relative to the anvil, the first matching portion is engaged with the second matching portion.

5. The circular tubular stapler according to claim 4, characterized in that: The first matching portion includes a protrusion facing the anvil axis, and the second matching portion includes a groove corresponding to the protrusion. When the proximal end of the firing plate is retracted inwardly relative to the anvil axis, the protrusion of the firing plate is embedded in the groove of the nail pushing rod.

6. The circular tubular stapler according to claim 5, 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.

7. The circular tubular stapler according to claim 5, characterized in that: The groove at the distal end of the nail pushing rod is a concave ring surrounding the nail pushing rod.

8. The circular tubular stapler according to claim 4, characterized in that: The second matching portion includes a protrusion facing outward, and the first matching portion includes a groove corresponding to the protrusion. When the proximal end of the firing plate is retracted axially inward relative to the anvil, the protrusion of the nail pushing rod is embedded in the groove of the firing plate.

9. The circular tubular stapler according to claim 1, characterized in that: A connecting portion is provided between the first anvil shaft portion and the second anvil shaft portion, and a surface of the connecting portion is a transition surface.

10. 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.

11. 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 along the axial direction of the stapler.

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