Firing mechanism and stapler

Abstract

The present invention provides a firing mechanism and an anastomosis device, including a nail pushing assembly, wherein the nail pushing assembly includes a selectively linked connecting portion and a firing rod. Through the present invention, when the distance between the nail anvil assembly and the nail magazine does not reach a suitable position, the connecting portion is in a first state, the firing rod and the connecting portion are not linked, and even if the handle is gripped, the firing rod will not push the connecting portion, and will not cause misfiring. When the nail anvil assembly moves to a suitable position, the connecting portion is in a second state, the firing rod and the connecting portion are linked, and at this time, if the handle is gripped, the firing rod can push the connecting portion to fire the anastomosis device; therefore, the present invention prevents misfiring when the operation is not ready, while ensuring the normal operation of the nail pushing assembly, thereby improving the safety of the use of the instrument.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a firing mechanism and an anastomosis device. 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 firing mechanism and an anastomosis device. When the distance between the anvil assembly and the stapler does not reach a suitable position, even if the operating handle is gripped, the staple pusher assembly will not push the staple pusher plate, thereby preventing misfiring.

[0006] An embodiment of the present invention provides a firing mechanism for a stapler, comprising a nail pushing assembly, wherein the nail pushing assembly comprises a firing rod and a connecting portion at the distal end of the firing rod, wherein the connecting portion has a first state and a second state;

[0007] When the connecting portion is in the first state, the firing rod is not linked to the connecting portion, and the stapler cannot be fired; when the connecting portion is in the second state, the firing rod is linked to the connecting portion, and the stapler can be fired.

[0008] Optionally, the connecting portion includes two rotating arms arranged opposite to each other, and when the connecting portion is in the first state, the first ends of the two rotating arms are retracted inwardly, and the second ends of the two rotating arms are opened outwardly, and when the connecting portion is in the second state, the first ends of the two rotating arms are opened outwardly, and the second ends of the two rotating arms are retracted inwardly.

[0009] Optionally, the firing mechanism further comprises a screw rod, a top block is arranged on the screw rod, and the top block has a first position area and a second position area;

[0010] When the top block is in the first position area, the top block does not contact the rotating arm, and the first ends of the two rotating arms are retracted. When the top block is in the second position area, the top block enters between the first ends of the two rotating arms to push the first ends of the two rotating arms outward.

[0011] Optionally, the nail pushing assembly further comprises a nail pushing rod located at the distal ends of the two rotating arms, and the rotating arms are linked to the nail pushing rod.

[0012] Optionally, a top block groove is provided on the screw rod, the bottom end of the top block can be rotatably fixed to the distal end of the top block groove, and a reset structure is provided on the top block, and when the top block is not subjected to external force, the top end of the top block protrudes from the top block groove;

[0013] When the top block is located in the first position area, the proximal end of the nail pushing rod presses the top block so that the top end of the top block deflects toward the proximal end of the top block slot and does not move in conjunction with the rotating arm;

[0014] When the top block moves from the first position area to the second position area, the top end of the top block gradually breaks away from the suppression of the proximal end of the nail pushing rod, and the top block rotates under the action of the reset structure until the top end of the top block protrudes from the top block groove and enters between the first ends of the two rotating arms.

[0015] Optionally, an open cavity is provided at the position corresponding to the proximal end of the push rod and the top block groove, and when the top block moves from the first position area to the second position area, the top end of the top block protrudes out of the top block groove and enters the open cavity, and further enters between the first ends of the two rotating arms from the open cavity.

[0016] Optionally, the bottom end of the top end is pivotally fixed to the distal end of the top block slot via a top pin, and the reset structure includes a torsion spring sleeved on the top pin.

[0017] Optionally, when the top block is located in the first position area, the top end of the top block rotates until the top block completely enters the top block groove.

[0018] Optionally, a first guiding slope is provided on the distal side of the first end of the rotating arm, and when the top block moves from the first position area to the second position area, the first guiding slope of the rotating arm contacts the top block and guides the top block to enter between the first ends of the two rotating arms.

[0019] Optionally, the proximal side of the top block is provided with two second guiding inclined surfaces corresponding to the two rotating arms;

[0020] When the top block moves from the first position area to the second position area, the second guide slope of the top block contacts the first ends of the two rotating arms respectively and guides the top block to enter between the first ends of the two rotating arms.

[0021] Optionally, a tension spring is connected between the first ends of the two rotating arms, and when the connecting portion is in the first state, under the action of the tension spring, the first ends of the two rotating arms are retracted inward and the second ends are opened.

[0022] Optionally, a compression spring is connected between the second ends of the two rotating arms, and when the connecting portion is in the first state, under the action of the compression spring, the second ends of the two rotating arms are opened and the first ends of the two rotating arms are retracted.

[0023] Optionally, the first ends of the two rotating arms are respectively provided with protrusions facing opposite sides, and when the first ends of the two rotating arms are folded together, the protrusions at the first ends of the two rotating arms are in contact with each other.

[0024] Optionally, the inner surfaces of the rotating arms are respectively formed as arc surfaces that are recessed outward relative to the screw rod, and the arc surfaces are adapted to the shape of the outer surface of the screw rod.

[0025] Optionally, the second end of the rotating arm is further provided with a driving arm extending toward the proximal end of the stapler, and when the second ends of the two rotating arms are retracted inwardly, the firing rod contacts the proximal side of the driving arm and then links with the rotating arm.

[0026] Optionally, an operating handle is further included, and the operating handle can drive the firing rod to move from the proximal end to the distal end of the stapler.

[0027] An embodiment of the present invention further provides a stapler, comprising the firing mechanism.

[0028] The firing mechanism and stapler provided by the present invention have the following advantages:

[0029] The present invention provides a firing mechanism for a circular tube-type stapler, in which a nail pushing assembly is designed as a selectively linked connecting part and a firing rod, when the distance between the nail anvil assembly and the nail magazine does not reach a suitable position, the connecting part is in a first state, the firing rod and the connecting part are not linked, even if the operating handle is gripped, the firing rod will not push the connecting part, thereby not causing misfiring; when the nail anvil assembly moves to a suitable position relative to the nail magazine, the connecting part is in a second state, the firing rod and the connecting part are linked, at this time, if the operating handle is gripped, the firing rod can push the connecting part and then fire the stapler; therefore, the present invention prevents misfiring when the operation is not ready, while ensuring the normal operation of the nail pushing assembly, thereby improving the safety of the instrument use. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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.

[0031] Figure 1 is a schematic structural diagram of a stapler according to an embodiment of the present invention;

[0032] Figure 2 is a schematic diagram of a stapler according to an embodiment of the present invention with one side of the housing removed;

[0033] Figure 3 is a schematic diagram of the cooperation between a pointer and a pull tab according to an embodiment of the present invention;

[0034] Figure 4 It is a schematic structural diagram of the cooperation between the push pin assembly and the screw rod in the initial state of an embodiment of the present invention;

[0035] Figure 5 and Figure 6It is an exploded view of the cooperation between the push pin assembly and the screw rod in the initial state of an embodiment of the present invention;

[0036] Figure 7 yes Figure 6 Enlarged view of the M in the middle;

[0037] Figure 8 It is a schematic diagram of the cooperation between the ejector block, the ejector pin and the torsion spring according to one embodiment of the present invention;

[0038] Fig. 9 It is a top view of the push pin assembly and the screw rod in the initial state of an embodiment of the present invention;

[0039] Fig.10 yes Fig. 9 Sectional view along the A1-A1 direction;

[0040] Fig.11 It is a structural schematic diagram of the cooperation between the pin pusher assembly and the screw rod after surgical preparation according to an embodiment of the present invention;

[0041] Fig.12 It is a top view of the pin pusher assembly and the screw rod after surgical preparation according to an embodiment of the present invention;

[0042] Fig.13 yes Fig.12 Cross-sectional view along the A2-A2 direction.

[0043] Reference numerals:

[0044] 11 Stapler body housing 42 Proximal end of firing rod

[0045] 12 Nail cartridge assembly 51 Knob

[0046] 13 nail anvil assembly 52 pull tab

[0047] 2 Push rod 53 Pointer

[0048] 21 Proximal end of the push rod 6 Screw rod

[0049] 22 Open cavity 61 Top block groove

[0050] 3 Rotating arm 611 Far end of top block slot

[0051] 31 first end of the rotating arm 612 proximal end of the top block groove

[0052] 311 protrusion 62 top block

[0053] 312 tension spring 621 top of top block

[0054] 313 first guide slope 622 bottom end of top block

[0055] 32 The second end of the rotating arm 623 The second guiding slope

[0056] 321 cavity 63 torsion spring

[0057] 322 drive arm 64 ejector pin

[0058] 4 Trigger rod 7 Handle

[0059] 41 Distal end of firing rod DETAILED DESCRIPTION

[0060] 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.

[0061] In order to solve the technical problems of the prior art, the present invention provides a firing mechanism for a stapler, including a nail pushing assembly, the nail pushing assembly including a firing rod and a connecting portion located at the distal end of the firing rod, the connecting portion having a first state and a second state; when the connecting portion is in the first state, the firing rod and the connecting portion are not linked, and the stapler cannot be fired; when the connecting portion is in the second state, the firing rod and the connecting portion are linked, and the stapler can be fired. Similar to the prior art, a screw rod is inserted into the nail pushing assembly and the nail pushing rod.

[0062] Specifically, the present invention designs the nail pushing assembly into a connecting portion and a firing rod, and the connecting portion and the firing rod are selectively linked. When the distance between the nail anvil assembly and the nail magazine does not reach a suitable position, the connecting portion is in a first state, the firing rod and the connecting portion are not linked, and the nail magazine assembly will not be accidentally fired. When the nail anvil assembly moves to a suitable position relative to the nail magazine, the connecting portion is in a second state, the firing rod and the connecting portion are linked, and at this time, if the operating handle is gripped, the stapler can be fired.

[0063] In one embodiment of the present invention, the connecting portion includes two rotating arms arranged opposite to each other, and the two rotating arms include a first end and a second end respectively. In the present invention, the rotating arm can be sleeved on the outside of the screw rod, so that the first end and the second end of the rotating arm are respectively located at the two end portions on the upper and lower sides of the screw rod, and when the first end of the rotating arm moves toward the inside, the second end of the rotating arm moves relatively toward the outside. For example, in each of the figures of the present invention, the first end of the rotating arm is the top end of the rotating arm, and the second end of the rotating arm is the bottom end of the rotating arm. The distal end of the firing rod is opposite to the second ends of the two rotating arms, and when the connecting mechanism is in the first state, the first ends of the two rotating arms are retracted inwardly, and the second ends of the two rotating arms are opened outwardly, and when the connecting mechanism is in the second state, the first ends of the two rotating arms are opened outwardly, and the second ends of the two rotating arms are retracted inwardly.

[0064] In the initial state, the top block is located in the first position area, the top block is located on the distal side of the first end of the rotating arm and does not contact the rotating arm, the first ends of the two rotating arms are naturally retracted inward when not affected by the top block, and the second ends of the two rotating arms are opened outward, forming a cavity between the second ends of the two rotating arms, and when the firing rod moves from the proximal end to the distal end of the stapler, it enters the cavity between the second ends of the two rotating arms. Therefore, the firing rod and the rotating arm are not linked. At this time, even if the operator accidentally presses the handle to push the firing rod, the stapler will not be fired, thereby avoiding accidental firing when the operation is not ready.

[0065] During the surgical preparation process, it is necessary to move the screw rod toward the proximal end of the stapler. When the top block is located in the second position area, the top block enters between the first ends of the two rotating arms to push the first ends of the two rotating arms outward, that is, the first ends of the two rotating arms are away from each other, and the second ends of the two rotating arms are retracted inward, that is, the second ends of the two rotating arms are close to each other and enter the route where the firing rod moves from the proximal end to the distal end. When the firing rod moves from the proximal end to the distal end of the stapler, it contacts the second end of the rotating arm and then links with the rotating arm. At this time, if the operator presses the handle to push the firing rod, the stapler can be fired, thereby realizing the normal function of the stapler.

[0066] The structure of the stapler of the present invention is described in detail below with reference to the accompanying drawings. Figures 4 to 11 In order to clearly show the various components, only a portion of the screw rod is cut out to show the structure of the portion blocked by the screw rod.

[0067] 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 shown separated from the stapler body. The stapler includes a stapler body and an anvil assembly 13. The stapler body includes a stapler housing 11 and a stapler assembly 12 located at the distal end of the stapler housing 11. The stapler assembly 12 includes an annular stapler, a staple pusher and a cutter. The proximal end of the stapler assembly 12 is provided with a staple pusher assembly. The anvil assembly 11 includes an anvil shaft and an anvil disposed at the distal end of the anvil shaft. The anvil shaft can drive the anvil to move along the axial direction of the anvil shaft, so that the anvil is close to or away from the stapler assembly 12.

[0068] 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 In the perspective of the drawing, 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. For example, for the push pin assembly, the proximal end of the push pin assembly is the end that is biased to the right relative to the distal end of the push pin assembly. For example, for the screw rod 6, the proximal end of the screw rod 6 is the end that is biased to the right relative to the distal end of the screw rod 6. The top and bottom in the present invention are relative to the drawing, the direction above the drawing is the top, and the opposite direction is the bottom.

[0069] 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 pusher assembly, and the rotation of the operating handle 7 toward the stapler body can drive the stapler pusher assembly to move from the proximal end to the distal end of the stapler.

[0070] 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 through a screw assembly 6. When the knob 51 rotates, the screw 6 drives the anvil shaft to move axially relative to the stapler body.

[0071] 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.

[0072] like Figure 3As shown, further, in this embodiment, the stapler body further includes a pointer 53 and a pull tab 52 located inside the stapler body, and the proximal end of the pull tab 52 is connected to the screw rod 6 and can move along the axial direction of the screw rod with the movement of the screw rod 6. The distal end of the pull tab 52 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.

[0073] In this embodiment, when the knob 51 rotates in the first direction, the screw 6 drives the pull tab 52 to move toward the proximal end of the stapler body, and the distal end of the pull tab 52 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 12 and the anvil assembly 11 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 pulls the anvil toward the stapler, so that the distance between the anvil assembly and the stapler assembly 12 reaches the appropriate position. At this time, the pointer 53 is also pulled by the pull tab 52 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 to indicate whether the stapler has completed the surgical preparation and is allowed to fire.

[0074] The position indication method of the anvil shaft is only an example and is not intended to be a limitation of the present invention. For example, the position of the anvil shaft may not necessarily be indicated by the pointer 53, but may be indicated by other methods to indicate whether the anvil shaft and the anvil have reached the firing position, or without visual indication.

[0075] In some staplers, the anvil shaft may not be provided, but the anvil may be directly provided at the distal end of the screw rod, which is also applicable to the present invention.

[0076] The present invention improves the push pin assembly and the screw rod. Figure 4The figure shows a schematic diagram of the structure of the push pin assembly and the screw rod according to an embodiment of the present invention. Among them, a top block 62 is arranged on the screw rod 6, and the push pin assembly is divided into three parts: the push pin rod 2 located at the distal end, the firing rod 4 located at the proximal end, and the rotating arm 3 located between the push pin rod 2 and the firing rod 4 in the axial direction, and the rotating arm 3 and the firing rod 4 are selectively linked. There are two rotating arms 3, which are arranged opposite to each other and cover the screw rod 6 together. The rotating arm 3 and the firing rod 4 can be selectively linked. When the push pin rod 2 moves toward the distal end of the stapler, it can push the push pin sheet to realize the firing of the stapler. The proximal end 42 of the firing rod 4 is linked with the operating handle 7. When holding the handle 7, the firing rod 4 can be pushed to move toward the distal end of the stapler. If the firing rod 4 is linked with the rotating arm 3 at this time, the firing rod 4 can push the push pin rod 2 through the rotating arm 3, thereby realizing the firing of the stapler. It is understandable that in practical applications, the nail push rod 2 is not a necessary component, and the rotating arm 3 can also be directly matched with the nail push piece, which also falls within the protection scope of the present invention. In order to prevent the stapler from being accidentally fired when the nail anvil assembly is not moved to a suitable position, the present invention further adds a failure protection mode.

[0077] In this embodiment, the second end 32 of the rotating arm 3 is also provided with a driving arm 322 extending toward the proximal end of the stapler. When the second ends of the two rotating arms 3 are retracted, the firing rod 4 contacts the proximal side of the driving arm 322 and then links with the rotating arm 3.

[0078] like Figures 4 to 10 As shown, a schematic diagram of the circular tubular stapler of this embodiment in the initial state is shown, and the circular tubular stapler is in a failure protection mode at this time. In the initial state, the top block 62 is located in the first position area, the top block 62 is located at the distal side of the first end of the rotating arm 3 and does not contact the rotating arm 3, the first ends 31 of the two rotating arms 3 are naturally retracted inward when not affected by the top block 62, and the second ends 32 of the two rotating arms 3 are opened outward, forming a cavity between the second ends 32 of the two rotating arms 3, and the firing rod 4 moves from the proximal end to the distal end of the stapler, and enters the cavity 321 between the second ends 32 of the two rotating arms 3, so the firing rod 4 and the rotating arm 3 are not linked, and even if the operator accidentally presses the handle 7 to push the firing rod 4, it will not cause the stapler to fire, thereby avoiding misfiring when the operation is not ready. The inside and outside mentioned in the present invention are relative, and the direction of approaching each other is inside, and the opposite direction is outside.

[0079] In this embodiment, a top block groove 61 is provided on the screw rod 6, and the bottom end 622 of the top block 62 is rotatably fixed to the distal side of the top block groove 61. A reset structure is provided on the top block 62. When the top block 62 is not subjected to external force, the top end 621 of the top block 62 at least partially protrudes from the top block groove 61. An open cavity 22 is provided at the proximal end of the push rod. When the top block 62 is located in the first position area, the push rod 2 covers the distal end of the top block groove 61 and presses the top block 621 of the top block 62, so that the top block 621 of the top block 62 rotates toward the proximal end of the top block groove 61. At this time, the top block 621 of the top block 62 is lowered relative to the screw rod 6, and can further fully enter the top block groove 61. When the top block 62 moves from the first position area to the second position area, the top block groove 61 moves toward the proximal end of the anastomosis device relative to the nail pushing rod 2. Since the distal end of the top block groove 61 is separated from the nail pushing rod 2, the top block 62 is rotated under the action of the rotational reset structure until the top block 621 of the top block 62 protrudes from the top block groove 61 and first enters the open cavity 22 of the nail pushing rod.

[0080] like Figure 5 and Figure 6 As shown, in this embodiment, the bottom end 622 of the top block 62 is pivotally fixed to the distal end of the top block slot 62 through a top pin 64, and the reset structure includes a torsion spring 622 sleeved on the top pin 64. In the initial state, the top block 62 is subjected to the pressure of the nail pushing rod 2, and the torsion spring 622 is rotated and deformed to a certain extent. When the distal end of the top block slot 61 gradually separates from the nail pushing rod 2, the top block 62 loses the pressure of the nail pushing 2, and under the deformation recovery force of the torsion spring 622, the top block 621 of the top block 62 is pushed to rotate toward the distal end of the top block slot 61 until it protrudes from the top block slot 61 and enters the open cavity 22 of the nail pushing rod, and then with the further movement of the nail anvil shaft 6, the top block 62 enters from the open cavity 22 of the nail pushing rod to between the first ends 31 of the two rotating arms 3. This is only an example of the reset structure. In practical applications, other reset structures, such as other forms of springs, etc., can be used, all of which belong to the protection scope of the present invention.

[0081] like Figure 7 As shown, in this embodiment, in order to better guide the top block 62 to enter between the first ends 31 of the rotating arms 3 when the top block 62 moves toward the proximal direction of the anastomosis device relative to the rotating arm 3, the distal side of the first end 31 of the rotating arm 3 is respectively provided with a first guiding slope 313, when the top block 62 moves from the first position area to the second position area, the first guiding slope 313 of the rotating arm 3 contacts with the top block 62 and guides the top block 62 to enter between the first ends 31 of the two rotating arms 3.

[0082] like Figure 8As shown, corresponding to the two first guide slopes 313, the top block 62 and the corresponding surfaces of the two rotating arms 3 are respectively provided with two second guide slopes 623; when the top block 62 moves from the first position area to the second position area, the second guide slopes 623 of the top block 62 respectively contact the first ends 31 of the two rotating arms 3, and guide the top block 623 to enter between the first ends 623 of the two rotating arms 3.

[0083] In this embodiment, the first ends 31 of the two rotating arms 3 are respectively provided with protrusions 311 facing inwards, and when the first ends 31 of the two rotating arms 3 are folded, the protrusions 311 of the first ends 31 of the two rotating arms 3 are in contact with each other. At the same time, in order to better maintain the connection between the rotating arms 3 and the screw rod 6, the inner surfaces of the rotating arms 3 are respectively formed into arc surfaces that are concave outwards relative to the screw rod 6, and the arc surfaces are adapted to the shape of the outer surface of the screw rod 6.

[0084] like Figures 11 to 13 The schematic diagram of the structure of the circular tubular stapler in the present invention after surgical preparation is shown, and the stapler is in a normal firing mode at this time. During surgical preparation, the operator turns the knob 51 at the proximal end to drive the screw rod 6 to move toward the proximal end of the stapler, thereby driving the top block 62 to disengage from the nail push rod 2, and the top block 62 rotates until the top of the top block 62 protrudes from the top block groove 61. The top block 62 is guided by the second guide slope 623 and the first guide slope 313 to enter between the first ends 31 of the two rotating arms 3, and the first ends 31 of the two rotating arms 3 are spread apart, that is, the first ends 31 of the two rotating arms 3 are separated from each other, and the second ends 32 of the two rotating arms 3 are then retracted inward to reduce or eliminate the cavity between the second ends 32 of the two rotating arms 3, and the second ends 32 of the two rotating arms 3 enter the path of the firing rod 4 moving from the proximal end to the distal end. The distal end 41 of the firing rod 4 is opposite to the proximal end of the second ends 32 of the two rotating arms 3. When the gripping handle 7 pushes the firing rod 4, after the distal end 41 of the firing rod 4 contacts the proximal ends of the second ends 32 of the two rotating arms 3, the firing rod 41 is linked with the rotating arms 3 to push the rotating arms 3 and the nail pushing rod 2 to achieve normal firing of the stapler.

[0085] In this embodiment, a tension spring 312 is further connected between the first ends 31 of the two rotating arms 3. When the top block 62 is not in contact with the rotating arms 3, under the action of the tension spring 312, the first ends 31 of the two rotating arms 3 are retracted inwards, that is, close to each other. At this time, the tension spring 312 does not deform or slightly deforms and is stretched. When the top block 62 enters between the first ends 31 of the two rotating arms 3, the first ends 31 of the two rotating arms 3 are stretched apart. Fig.11As shown, the tension spring 312 is stretched and deformed. After the top block 62 and the first ends 31 of the two rotating arms 3 are separated from the proximal ends of the first ends 31, the tension spring 312 pulls the first ends 31 of the two rotating arms 3 back to a retracted state close to each other.

[0086] In other embodiments, the resetting and holding structure of the rotating arm 3 may not use the tension spring 312. For example, a compression spring may be connected between the second ends 32 of the two rotating arms 3. When the top block 62 is not in contact with the rotating arm 3, under the action of the compression spring, the second ends 32 of the two rotating arms 3 are opened and the first ends 31 of the two rotating arms 3 are retracted, and the compression spring is not deformed at this time. When the top block 62 enters between the first ends 31 of the two rotating arms 3, the first ends 31 of the two rotating arms 3 are stretched apart, and the second ends 32 of the two rotating arms 3 are retracted inwardly, and the compression spring is deformed. After the top block 62 is separated from the first ends 31 of the two rotating arms 3, the deformation recovery force of the compression spring stretches the second ends 32 of the two rotating arms 3 again, so that the first ends 31 of the two rotating arms 3 are pulled back to the retracted state.

[0087] When the pointer 53 is used as the position indicator of the anvil assembly 13 in the stapler, when the pointer 53 is in the third position area, the top block 62 is in the first position area, and the stapler is in the failure protection mode. At this time, even if the handle 7 is held, the stapler will not be fired. When the pointer 53 is pulled by the pull tab 52 and enters the fourth position area, the top block 62 also moves into the second position area with the movement of the screw rod 6, and the stapler is in the normal firing mode. At this time, if the handle 7 is held, the stapler can be fired normally.

[0088] The firing mechanism and stapler provided by the present invention have the following advantages:

[0089] The present invention provides a firing mechanism for a circular tube-type stapler, in which a nail pushing assembly is designed as a selectively linked connecting part and a firing rod, when the distance between the nail anvil assembly and the nail magazine does not reach a suitable position, the connecting part is in a first state, the firing rod and the connecting part are not linked, even if the operating handle is gripped, the firing rod will not push the connecting part, thereby not causing misfiring; when the nail anvil assembly moves to a suitable position relative to the nail magazine, the connecting part is in a second state, the firing rod and the connecting part are linked, at this time, if the operating handle is gripped, the firing rod can push the connecting part and then fire the stapler; therefore, the present invention prevents misfiring when the operation is not ready, while ensuring the normal operation of the nail pushing assembly, thereby improving the safety of the instrument use.

[0090] 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 scope of protection of the present invention.

Claims

1. A firing mechanism, characterized in that: Used in a stapler, comprising a stapler pusher assembly, the stapler pusher assembly comprising a firing rod and a connecting portion at the distal end of the firing rod, the connecting portion comprising two rotating arms arranged opposite to each other, the connecting portion having a first state and a second state; When the connecting portion is in the first state, the first ends of the two rotating arms are retracted inwardly, and the second ends of the two rotating arms are opened outwardly, the firing rod is not linked to the connecting portion, and the stapler cannot be fired; when the connecting portion is in the second state, the first ends of the two rotating arms are opened outwardly, and the second ends of the two rotating arms are retracted inwardly, the firing rod is linked to the connecting portion, and the stapler can be fired.

2. The firing mechanism according to claim 1, characterized in that: The firing mechanism further comprises a screw rod, on which a top block is arranged, and the top block has a first position area and a second position area; When the top block is in the first position area, the top block does not contact the rotating arm, and the first ends of the two rotating arms are retracted. When the top block is in the second position area, the top block enters between the first ends of the two rotating arms to push the first ends of the two rotating arms outward.

3. The firing mechanism according to claim 2, characterized in that: The nail pushing assembly also includes a nail pushing rod located at the distal ends of the two rotating arms, and the rotating arms are linked to the nail pushing rod.

4. The firing mechanism according to claim 3, characterized in that: The screw rod is provided with a top block groove, the bottom end of the top block can be rotatably fixed to the distal end of the top block groove, and a reset structure is provided on the top block, and when the top block is not subjected to external force, the top end of the top block protrudes from the top block groove; When the top block is located in the first position area, the proximal end of the nail pushing rod presses the top block so that the top end of the top block deflects toward the proximal end of the top block slot and does not move in conjunction with the rotating arm; When the top block moves from the first position area to the second position area, the top end of the top block gradually breaks away from the suppression of the proximal end of the nail pushing rod, and the top block rotates under the action of the reset structure until the top end of the top block protrudes from the top block groove and enters between the first ends of the two rotating arms.

5. The firing mechanism according to claim 4, characterized in that: An open cavity is provided at the position corresponding to the proximal end of the push rod and the top block groove. When the top block moves from the first position area to the second position area, the top end of the top block protrudes out of the top block groove and enters the open cavity, and further enters between the first ends of the two rotating arms from the open cavity.

6. The firing mechanism according to claim 4, characterized in that: The bottom end of the top end is pivotally fixed to the distal end of the top block slot through a top pin, and the reset structure comprises a torsion spring sleeved on the top pin.

7. The firing mechanism according to claim 4, characterized in that: When the top block is located in the first position area, the top end of the top block rotates until the top block completely enters the top block groove.

8. The firing mechanism according to claim 2, characterized in that: A first guiding slope is provided on the distal side of the first end of the rotating arm. When the top block moves from the first position area to the second position area, the first guiding slope of the rotating arm contacts the top block and guides the top block to enter between the first ends of the two rotating arms.

9. The firing mechanism according to claim 2, characterized in that: The proximal end side of the top block is provided with two second guiding inclined surfaces corresponding to the two rotating arms; When the top block moves from the first position area to the second position area, the second guide slope of the top block contacts the first ends of the two rotating arms respectively and guides the top block to enter between the first ends of the two rotating arms.

10. The firing mechanism according to claim 1, characterized in that: A tension spring is connected between the first ends of the two rotating arms. When the connecting portion is in the first state, under the action of the tension spring, the first ends of the two rotating arms are retracted inward and the second ends are opened.

11. The firing mechanism according to claim 1, characterized in that: A compression spring is connected between the second ends of the two rotating arms. When the connecting portion is in the first state, under the action of the compression spring, the second ends of the two rotating arms are opened and the first ends of the two rotating arms are retracted.

12. The firing mechanism according to claim 1, characterized in that: The first ends of the two rotating arms are respectively provided with protrusions facing the opposite sides, and when the first ends of the two rotating arms are folded together, the protrusions at the first ends of the two rotating arms are in contact with each other.

13. The firing mechanism according to claim 2, characterized in that: The inner surfaces of the rotating arms are respectively formed into arc surfaces that are recessed outward relative to the screw rod, and the arc surfaces are adapted to the shape of the outer surfaces of the screw rod.

14. The firing mechanism according to claim 1, characterized in that: The second end of the rotating arm is also provided with a driving arm extending toward the proximal end of the stapler. When the second ends of the two rotating arms are retracted inward, the firing rod contacts the proximal end side of the driving arm and then links with the rotating arm.

15. The firing mechanism according to claim 1, characterized in that: It also includes an operating handle, which can drive the firing rod to move from the proximal end to the distal end of the stapler.

16. A stapler, characterized in that: Includes the firing mechanism described in any one of claims 1 to 15.

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