Firing mechanism and stapler

Abstract

The present invention provides a firing mechanism and a stapler, which include a staple pushing assembly. The staple pushing assembly includes a firing rod, a connecting portion, and a staple pushing rod that are sequentially arranged from the proximal end to the distal end of the stapler. The connecting portion is linked with the staple pushing rod, the firing rod and the connecting portion are selectively linked, and the connecting portion has a first state and a second state. Through the present invention, when the anvil does not reach the appropriate position, the connecting portion is in the first state, and the firing rod and the connecting portion do not form a linkage. Even if the operating handle is squeezed, accidental firing of the stapler will not occur. When the anvil moves relative to the cartridge to the appropriate position, the connecting portion is in the second state, and the firing rod and the connecting portion are linked. At this time, if the operating handle is squeezed, the firing rod can push the staple pushing rod through the connecting portion for firing. Therefore, on the premise of ensuring the normal operation of the staple pushing rod, the present invention prevents accidental firing when the surgery is not ready, and improves the safety of the use of the instrument.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly relates to a firing mechanism and a stapler. Background Art

[0002] Digestive tract diseases are one of the high-incidence diseases in humans. During the treatment process, a circular stapler is often used to replace the manual operation of doctors to anastomose physiological tissues such as the digestive tract. The circular stapler is a common surgical instrument, and most of them adopt an axial internal stapling method. During the operation, it forms an end-to-end or end-to-side anastomosis of physiological tissues such as the esophagus, stomach, and intestine. When anastomosing, the two sections of tissues are converged and received in the stapler. After firing, a circular anastomotic stoma is formed on the tissue, reconstructing the human body passage.

[0003] In the prior art, the circular stapler includes a stapler body, an operating handle movably connected to the stapler body, and an anvil assembly cooperating with the body. The stapler body includes a cartridge assembly provided at the distal end, and the cartridge assembly includes an annular cartridge and a cutter; and a knob provided at the proximal end of the body, the knob can rotate relative to the body, and the inside of the stapler body further includes an 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 position, is the distal end. In the stapler, the inner side and the outer side are relative to the axis of the stapler. The side closer to the axis is the inner side, and the side away from the axis is the outer side. The anvil assembly includes an anvil, an anvil cap provided at the distal end of the anvil, and a knife anvil provided inside the anvil. The anvil assembly can be directly connected to the distal end of the anvil shaft or connected through an anvil shaft connecting member. During a tumor operation, after the tumor tissue is severed and removed, the anvil shaft passes through the purse string of the stump tissue and is arranged at the distal end of the stapler body. By rotating the knob, the distance between the anvil assembly and the cartridge gradually decreases until it reaches a suitable distance and reaches the firing state, then the operating handle can be held to fire the instrument to complete the anastomosis. With the continuous development of medical devices, the circular stapler is also more and more widely used in the treatment of diseases such as hemorrhoids.

[0004] As described above, whether in a tumor operation or in the treatment of hemorrhoids, before firing the stapler, it is necessary to rotate the knob to make the distance between the anvil assembly and the cartridge reach a suitable distance. However, when actually using a circular stapler for surgery, the operator may accidentally hold and move the operating handle and cause accidental firing when the distance between the anvil assembly and the cartridge has not reached the appropriate position, resulting in the failure of the operation and even possibly causing a medical accident. 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 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 firing rod cannot push the staple push rod, and no accidental firing will occur.

[0006] An embodiment of the present invention provides a firing mechanism for a stapler, the firing mechanism comprising a nail pushing assembly, the nail pushing assembly comprising a firing rod, a connecting portion and a nail pushing rod arranged in sequence from the proximal end to the distal end of the stapler, the connecting portion being linked to the nail pushing rod, and the connecting portion having 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 at least one rotating block, and the distal end of the rotating block is rotatably connected to the proximal end of the nail pushing rod;

[0009] When the connecting portion is in the first state, the proximal end of the rotating block is opened outward; when the connecting portion is in the second state, the proximal end of the rotating block is retracted inward.

[0010] Optionally, it further comprises a screw rod passing through the interior of the push pin assembly, the screw rod comprises a first screw rod portion and a second screw rod portion, the second screw rod portion is located at the distal end of the first screw rod portion, and the outer diameter of the second screw rod portion is smaller than the outer diameter of the first screw rod portion;

[0011] When the distal end of the rotating block is located at the first screw rod part, the proximal end of the rotating block opens outward; when the distal end of the rotating block is located at the second screw rod part, the proximal end of the rotating block retracts inward.

[0012] Optionally, a boss is provided on the inner wall of the distal end of the rotating block, and when the connecting portion is in the first state, the boss of the rotating block abuts against the first screw rod portion.

[0013] Optionally, a proximal end of the nail-pushing rod is provided with a mounting groove corresponding one-to-one to the rotating block, and a distal end of the rotating block is rotatably mounted in the mounting groove via a rotating shaft.

[0014] Optionally, a torsion spring is also provided on the rotating shaft. When the distal end of the rotating block is located at the first screw rod part, the torsion spring is deformed. When the distal end of the rotating block is separated from the first screw rod part, the deformation restoring force of the torsion spring causes the distal end of the rotating block to retract inward relative to the screw rod.

[0015] Optionally, a first guiding inclined surface is provided at the end of the boss of the rotating block. When the distal end of the rotating block is located at the first lead screw portion, the first guiding inclined surface at the end of the boss abuts against the first lead screw portion.

[0016] Optionally, a lead screw connecting portion is further provided between the first lead screw portion and the second lead screw portion, and the outer surface of the lead screw connecting portion is a transition surface.

[0017] Optionally, two rotating blocks are provided at the proximal end of the staple pushing rod, and the two rotating blocks are arranged oppositely.

[0018] Optionally, two opposite firing portions are provided at the distal end of the firing rod, and the firing portions are axially corresponding to the proximal ends of the two rotating blocks when in the retracted state respectively.

[0019] Optionally, the firing mechanism further includes a lead screw disposed inside the staple pushing assembly, the firing rod further includes a firing rod connecting portion between the two firing portions, and the inner surface of the firing rod connecting portion is formed as an arc surface recessed outward relative to the lead screw, and the arc surface is adapted to the outer surface of the lead screw.

[0020] Optionally, the stapler further includes an operating handle, and the operating handle can drive the firing rod to move from the proximal end to the distal end of the stapler.

[0021] An embodiment of the present invention further provides a stapler including the firing mechanism as described above.

[0022] The firing mechanism and the stapler provided by the present invention have the following advantages:

[0023] The present invention provides a firing mechanism for a stapler. When the anvil assembly has not reached the appropriate position, the connecting portion is in the first state, and the firing rod and the connecting portion do not form a linkage. Even if the operating handle is squeezed, the firing rod cannot push the staple pushing rod, and misfiring of the stapler will not occur. When the anvil assembly moves relative to the cartridge to the appropriate position, the connecting portion is in the second state, and the firing rod and the connecting portion are in linkage. At this time, if the operating handle is squeezed, the firing rod can push the staple pushing rod through the connecting portion for firing; therefore, on the premise of ensuring the normal operation of the staple pushing rod, the present invention prevents misfiring when the operation is not ready, and improves the safety of the use of the instrument. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Other features, objects, and advantages of the present invention will become more apparent by reading the detailed description of the non-limiting embodiments with reference to the following drawings.

[0025] Figure 1 is a schematic structural diagram of a stapler according to an embodiment of the present invention;

[0026] Figure 2Schematic diagram of removing one side housing of a stapler according to an embodiment of the present invention;

[0027] Figure 3 Schematic diagram of the cooperation between the pointer and the pull tab according to an embodiment of the present invention;

[0028] Figure 4 Schematic diagram of the structure of the cooperating part of the staple pushing rod and the lead screw when the stapler is in the failure protection mode according to an embodiment of the present invention;

[0029] Figure 5 Exploded view of the cooperating part of the staple pushing rod and the lead screw when the stapler is in the failure protection mode according to an embodiment of the present invention;

[0030] Figure 6 Bottom view of the cooperating part of the staple pushing rod and the lead screw when the stapler is in the failure protection mode according to an embodiment of the present invention;

[0031] Figure 7 It is Figure 6 Cross-sectional view in the direction of A1 - A1 in;

[0032] Figure 8 Schematic diagram of the structure of the cooperating part of the staple pushing rod and the lead screw when the stapler is in the firing mode according to an embodiment of the present invention;

[0033] Figure 9 Bottom view of the cooperating part of the staple pushing rod and the lead screw when the stapler is in the firing mode according to an embodiment of the present invention;

[0034] Figure 10 It is Figure 9 Cross-sectional view in the direction of A2 - A2 in.

[0035] Reference numerals:

[0036] 11 Stapler body housing 4 Firing rod

[0037] 12 Cartridge assembly 41 Distal end of the firing rod

[0038] 13 Anvil assembly 42 Proximal end of the firing rod

[0039] 2 Staple pushing rod 43 Firing rod connection part

[0040] 21 Proximal end of the staple pushing rod 51 Knob

[0041] 3 Rotating block 52 Pull tab

[0042] 31 Distal end of the rotating arm 53 Pointer

[0043] 311 Rotating shaft 6 Lead screw

[0044] 312 Torsion spring 61 First lead screw part

[0045] 313 boss 62 second lead screw part

[0046] 314 first guiding inclined surface 63 lead screw connecting part

[0047] 32 proximal end of the rotating arm 7 handle

[0048] 321 cavity Detailed implementation manners

[0049] Example embodiments will now be described more specifically with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. Like reference numerals in the figures denote the same or similar structures, and thus their repeated description will be omitted.

[0050] To solve the technical problems in the prior art, the present invention provides a firing mechanism for a stapler. The firing mechanism includes a staple pushing assembly, and a lead screw is disposed through the staple pushing assembly. The staple pushing assembly includes a firing rod, a connecting part, and a staple pushing rod, which are sequentially arranged from the proximal end to the distal end of the stapler. The connecting part is linked with the staple pushing rod, and the connecting part is selectively linked with the firing rod. Specifically, the connecting part has a first state and a second state; when the connecting part is in the first state, the firing rod is not linked with the connecting part, and the connecting part cannot transfer the movement of the firing rod to the staple pushing rod, and the stapler cannot be fired; when the connecting part is in the second state, the firing rod is linked with the connecting part, and the connecting part can transfer the movement of the firing rod to the staple pushing rod, and the stapler can be fired.

[0051] Therefore, in the present invention, the staple pushing assembly is divided into three parts, and the connecting part is selectively linked with the firing rod. When the distance between the anvil assembly and the cartridge has not reached the appropriate position, the connecting part is in the first state, and the firing rod is not linked with the connecting part, so that misfiring of the cartridge assembly will not occur. When the anvil assembly moves relative to the cartridge to the appropriate position, the connecting part is in the second state, and the firing rod and the connecting part are linked. At this time, if the operating handle is gripped, the stapler can be fired.

[0052] In an embodiment of the present invention, the connecting portion includes at least one rotating block, and the distal end of the rotating block is rotatably connected to the proximal end of the staple pushing rod; when the connecting portion is in the first state, the proximal end of the rotating block opens outward to form a cavity between the rotating block and the lead screw; when the connecting portion is in the second state, the proximal end of the rotating block closes inward, so as to enter the path of the firing rod moving from the proximal end to the distal end. Here, opening outward means that the proximal end of the rotating block opens in a direction away from the lead screw, and closing inward means that the proximal end of the rotating block closes in a direction close to the lead screw.

[0053] In this embodiment, the lead screw includes a first lead screw portion and a second lead screw portion. The second lead screw portion is located at the distal end of the first lead screw portion, and the outer diameter of the second lead screw portion is smaller than that of the first lead screw portion; when the distal end of the rotating block is located on the first lead screw portion, the proximal end of the rotating block opens outward; when the distal end of the rotating block is located on the second lead screw portion, the proximal end of the rotating block closes inward.

[0054] In the initial state when the anvil assembly and the stapler body are just successfully docked or in the initial state when the tissue is just incorporated, the distal end of the rotating block abuts against the first lead screw portion, and the proximal end of the rotating block opens outward relative to the lead screw to form a cavity between the rotating block and the lead screw. When the firing rod moves from the proximal end to the distal end of the stapler, it enters the cavity between the proximal end of the rotating block and the lead screw. Therefore, the firing rod and the rotating block are not linked. At this time, even if the operator accidentally presses the handle to push the firing rod, it will not cause the stapler to fire, thus avoiding accidental firing when the operation is not ready.

[0055] During the operation preparation process, it is necessary to move the lead screw in the proximal direction of the stapler. When the lead screw moves to the position where the distal end of the rotating block is located on the second lead screw portion, since the outer diameter of the second lead screw portion is smaller than that of the first lead screw portion, the proximal end of the rotating block closes inward relative to the lead screw. When the firing rod moves from the proximal end to the distal end of the stapler, it contacts the rotating block and is linked with the rotating block. At this time, if the operator presses the handle to push the firing rod, the stapler is fired through the firing rod, the rotating block and the staple pushing piece in sequence, so as to realize the normal function of the stapler.

[0056] The structure of the stapler of the present invention will be introduced in detail below with reference to the accompanying drawings. Among them, in Figures 4 to 10 In order to clearly show each component, only a part of the lead screw is intercepted to show the structure of the part blocked by the lead screw.

[0057] As Figure 1 and Figure 2 shown, it is the structure of the stapler according to an embodiment of the present invention. In order to more clearly show the internal structure of the stapler, in Figure 2The middle part of one side of the stapler housing is removed, and the cartridge assembly is separated from the stapler body and shown. Among them, the stapler includes a stapler body and an anvil assembly 13. The stapler body includes a stapler housing 11 and a cartridge assembly 12 located at the distal end of the stapler housing 11. The cartridge assembly 12 includes an annular cartridge, a pusher plate, and a cutter. A pusher assembly is provided at the proximal end of the cartridge assembly 12. The anvil assembly 11 includes an anvil shaft and an anvil provided 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 moves towards or away from the cartridge assembly 12.

[0058] 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 position, is the distal end. That is, in this embodiment, when the operator uses it, the operator holds the handle to operate the stapler. In Figure 1 and Figure 2 's perspective, the end biased towards the right is the proximal end, and the end biased towards the left is the distal end. For example, for the pusher assembly, the proximal end of the pusher assembly is the end biased towards the right relative to the distal end of the pusher assembly. For example, for the lead screw 6, the proximal end of the lead screw 6 is the end biased towards the right relative to the distal end of the lead screw 6.

[0059] In this embodiment, the stapler further 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 pusher assembly. The rotational movement of the operating handle 7 towards the stapler body can drive the pusher assembly to move from the proximal end to the distal end of the stapler.

[0060] A knob 51 is further provided at the proximal end of the stapler body. The knob 51 is connected to the proximal end of the anvil shaft through a lead screw assembly 6. When the knob 51 rotates, the lead screw 6 drives the anvil shaft to axially move relative to the stapler body.

[0061] Figures 1 to 2 The structure of the circular tube type stapler shown in

[0062] is only an example. In practical applications, the structure of the circular tube type 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, and all belong to the protection scope of the present invention. Figure 3 As Figure 3The upper end of the middle pointer 53. The pointer 53 is pivotally fixed to the stapler housing 1. When the pointer 53 rotates, its first end can move between a first position area and a second position area.

[0063] In this embodiment, when the knob 51 rotates in the first direction, the lead screw 6 drives the pull tab 52 to move in the proximal direction of the stapler body, and the distal end of the pull tab 52 pulls the first end of the pointer 53 to move 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 staple cartridge assembly 12 and the anvil assembly 11 is relatively 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 pulls the anvil towards the stapler, so that the distance between the anvil assembly and the staple cartridge assembly 12 reaches the appropriate position. At this time, the pointer 53 is also pulled by the pull tab 52 to the second position area. At this time, the operator is allowed to fire the stapler. Therefore, the second position area is also called the firing area. Therefore, the pointer 53 can be used as an indication of the position of the anvil shaft to indicate whether the stapler has completed the surgical preparation and allows firing.

[0064] The position indication method of the anvil shaft here is only an example and is not a limitation of the present invention. For example, the position of the anvil shaft does not necessarily use the pointer 53 for indication, and other methods can also be used to indicate whether the anvil assembly has reached the firing position, or a visual indication method is not used.

[0065] The present invention has improved the staple pushing assembly and the lead screw. As Figure 4 shown, it is a schematic structural diagram of the cooperation between the staple pushing assembly and the lead screw according to an embodiment of the present invention. Among them, the lead screw 6 includes a first lead screw portion 61 at the proximal end of the lead screw 6 and a second lead screw portion 62 at the distal end of the lead screw 6. The outer diameter of the second lead screw portion 62 is smaller than the outer diameter of the first lead screw portion 61, and the lead screw 6 can axially move relative to the stapler body. A staple pushing assembly is sleeved outside the lead screw 6. The staple pushing assembly includes a firing rod 4, at least one rotating block 3 and a staple pushing rod 2 arranged in sequence from the proximal end to the distal end of the stapler. The distal end 31 of the rotating block 3 is rotatably connected to the proximal end 21 of the staple pushing rod 2. The rotating block 3 can be selectively linked with the firing rod 4. When the rotating block 3 is linked with the firing rod 4, when the rotating block 3 moves from the proximal end to the distal end of the stapler, it can push the staple pushing piece to move together through the staple pushing rod 2, and push out the staple cartridge and the cutter in the staple cartridge assembly 12 at the distal end of the stapler body to complete the firing of the stapler. The proximal end 42 of the firing rod 4 can be linked with the handle 7. When the handle 7 is held tightly, the handle 7 can push the firing rod 4 to move from the proximal end to the distal end of the stapler. In order to prevent the stapler from being accidentally fired when the anvil assembly has not moved to the appropriate position, the present invention further adds a failure protection mode.

[0066] In this embodiment, there are two rotating blocks 3, and they are arranged relative to each other in the radial direction of the screw rod 6, but the present invention is not limited to this. It is also possible to increase or decrease the number of rotating blocks 3 as needed. For example, only one rotating block 3 is set, or four rotating blocks 3 are set around the outside of the screw rod 6, etc., all of which fall within the protection scope of the present invention.

[0067] like Figures 4 to 7 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. Specifically, in the initial state, the rotating block 3 is located at the first screw rod portion 61, the distal end 31 of the rotating block 3 conflicts with the first screw rod portion 61, and the proximal end 32 of the rotating block 3 opens outward relative to the screw rod 6, forming a cavity 321 between the rotating block 3 and the screw rod 6. At this time, if the handle is held to move the firing rod 4 from the proximal end to the distal end of the stapler, the distal end of the firing rod 4 enters the cavity between the proximal end of the rotating block 3 and the screw rod 6. Therefore, the firing rod 4 is not linked with the rotating block 3. At this time, even if the operator accidentally presses the handle 7 to push the firing rod 4, the firing rod 4 cannot drive the nail push rod 2 to move to the distal end, nor will it cause the stapler to fire, thereby avoiding accidental firing when the operation is not ready.

[0068] like Figure 5 As shown, in this embodiment, the inner wall of the distal end 31 of the rotating block 3 is provided with a boss 313. In the initial state, the boss 313 of the rotating block 3 contacts the first screw part 61, and the proximal end 32 of the rotating block 3 opens outward relative to the screw 6. In this embodiment, the proximal end 21 of the push rod 2 is provided with a mounting groove corresponding to the rotating block 3. The distal end 31 of the rotating block 3 is rotatably mounted in the mounting groove through a rotating shaft 311, and the boss 313 is located at a position close to the proximal end of the mounting groove, that is, the right side of the mounting groove shown in the figure, and is not restricted by the mounting groove. A torsion spring 312 is also provided on the rotating shaft 311. In the initial state, the torsion spring 312 is deformed. When the distal end 31 of the rotating block 3 is located at the second screw part 62, the deformation recovery force of the torsion spring 62 causes the distal end 31 of the rotating block 3 to retract inward relative to the screw 6.

[0069] As the screw rod 6 gradually moves toward the proximal end, the stapler gradually closes, and when it reaches a suitable position, the rotating block 3 separates from the first screw rod portion 61 .

[0070] like Figure 5As shown, a first guiding bevel 314 is provided at the end of the boss 313 of the rotating block 3. In the initial state, the first guiding bevel 314 at the end of the boss 313 contacts the first screw rod portion 61. In the initial state, since the proximal end 32 of the rotating block 3 rotates outward, the boss 313 has a certain inclination angle. If the first guiding bevel 314 is not provided, the contact between the end of the boss 313 and the first screw rod portion 61 is point contact. However, by providing the first guiding bevel 314, in the initial state, the contact between the boss 313 and the first screw rod portion 61 becomes surface contact, thereby increasing the contact area between the end of the boss 313 and the first screw rod portion 61 and improving the overall stability of the stapler in the initial state.

[0071] In this embodiment, a screw connecting portion 63 is further provided between the first screw portion 61 and the second screw portion 62 , and an outer surface 63 of the screw connecting portion is a transition surface, such as an inclined surface.

[0072] Corresponding to the two rotating blocks 3, the distal end 41 of the firing rod 4 is provided with two opposite firing parts, and the firing parts respectively correspond to the proximal ends of the two rotating blocks 3 when they are retracted inwardly, so as to be able to work in conjunction with the rotating blocks 3 when the two rotating blocks 3 are retracted inwardly. In order to improve the structural coordination between the firing rod 4 and the screw rod 6, the firing rod 4 also includes a firing rod connecting part 43 between the two firing parts, which is formed as an arc surface that is recessed outwardly relative to the screw rod, and the arc surface is adapted to the outer surface of the screw rod 6. It is understandable that when the outer surface of the screw rod 6 is not an arc surface, the inner surface of the firing rod connecting part 43 is also a non-arc surface adapted thereto, so that the firing rod 4 can be supported and guided when it moves toward the distal end, so that the firing of the stapler is more stable.

[0073] like Figures 8 to 10The schematic diagram of the structure of the circular tubular stapler of the present invention is shown when the anvil assembly and the stapler assembly reach the appropriate position during surgery, and the stapler is in a normal firing mode. 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. When the screw rod 6 moves to the distal end 31 of the rotating block 3 and is located at the second screw rod portion 62, since the outer diameter of the second screw rod portion 62 is smaller than the outer diameter of the first screw rod portion 61, the proximal end 32 of the rotating block 3 is retracted inwardly relative to the screw rod 6 by the reset force of the torsion spring 312, thereby at least partially entering the path of the firing rod 4 moving from the proximal end to the distal end. When the handle 7 is held to fire the stapler, the firing rod 4 moves from the proximal end to the distal end of the stapler, and the firing rod 4 is linked with the rotating block 3. Among them, when the distal end of the rotating block 3 moves relative to the second screw part 62 during the firing process, the distal end 31 of the rotating block 3 can abut against the second screw part 62, or can be designed to be suspended, that is, the outer diameter of the second screw part 62 can be designed to be smaller, both of which can achieve the purpose of retracting the proximal end 32 of the rotating block 3 inward. Preferably, the proximal end of the rotating surface and the distal end of the firing rod are end-to-end abutted, and, when abutting, the abutting surface is perpendicular to the axial direction to prevent the mutual guiding effect of the non-vertical abutting surfaces during firing to increase the firing force during the anastomosis.

[0074] When the pointer 53 is used as the position indicator of the anvil assembly in the stapler, when the pointer 53 is located in the first position area, the distal end 31 of the rotating block 3 contacts the first screw rod portion 61 with a larger outer diameter, and the proximal end 32 of the rotating block 3 opens outward without being linked to the firing rod 4, and the stapler is in a 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 second position area, the distal end 31 of the rotating block 3 is located at the first screw rod portion 62 with a smaller outer diameter, and the proximal end 32 of the rotating block 3 is retracted inward and linked to the firing rod 4, and the stapler is in a normal firing mode. At this time, if the handle 7 is held, the stapler can be fired normally.

[0075] The firing mechanism and stapler provided by the present invention have the following advantages:

[0076] The present invention provides a firing mechanism for a stapler, wherein when the nail anvil assembly has not reached 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 operating handle is gripped, the firing rod cannot push the nail pushing rod, and will not cause misfiring of the stapler; 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 firing rod can push the nail pushing rod through the connecting portion to fire; therefore, the present invention prevents misfiring when the operation is not ready, while ensuring the normal operation of the nail pushing rod, thereby improving the safety of the use of the instrument.

[0077] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the concept of the present invention, several simple deductions or substitutions can be made, and all should be regarded as falling within the protection scope of the present invention.

Claims

1. A firing mechanism, characterized in that, For a stapler, the stapler includes an operating handle, and the firing mechanism includes a staple pushing assembly and a lead screw disposed inside the staple pushing assembly. The staple pushing assembly includes a firing rod, a connecting portion, and a staple pushing rod sequentially arranged from the proximal end to the distal end of the stapler. The connecting portion is linked with the staple pushing rod. The connecting portion includes at least one rotating block. The distal end of the rotating block is rotatably connected to the proximal end of the staple pushing rod, and the connecting portion has a first state and a second state; When the connecting portion is in the first state, the proximal end of the rotating block opens outward. When the firing rod is driven by the operating handle to move from the proximal end to the distal end of the stapler, it enters the cavity between the proximal end of the rotating block and the lead screw. The firing rod is not linked with the connecting portion, and the stapler cannot be fired; When the connecting portion is in the second state, the proximal end of the rotating block closes inward. When the firing rod is driven by the operating handle to move from the proximal end to the distal end of the stapler, after the firing rod contacts the rotating block, the firing rod is linked with the connecting portion. The firing rod drives the staple pushing rod through the connecting portion, and the stapler can be fired.

2. The firing mechanism according to claim 1, wherein, It further includes that the lead screw includes a first lead screw portion and a second lead screw portion. The second lead screw portion is located at the distal end of the first lead screw portion, and the outer diameter of the second lead screw portion is smaller than the outer diameter of the first lead screw portion; When the distal end of the rotating block is located at the first lead screw portion, the proximal end of the rotating block opens outward; when the distal end of the rotating block is located at the second lead screw portion, the proximal end of the rotating block closes inward.

3. The firing mechanism according to claim 2, characterized in that, A convex platform is provided on the inner wall of the distal end of the rotating block. When the connecting portion is in the first state, the convex platform of the rotating block abuts against the first lead screw portion.

4. The firing mechanism according to claim 3, characterized in that, The proximal end of the staple pushing rod is provided with mounting grooves corresponding to the rotating blocks one by one. The distal end of the rotating block is rotatably mounted in the mounting groove through a rotating shaft.

5. The firing mechanism according to claim 4, characterized in that, A torsion spring is further provided on the rotating shaft. When the distal end of the rotating block is located at the first lead screw portion, the torsion spring is deformed. When the distal end of the rotating block disengages from the first lead screw portion, the deformation restoring force of the torsion spring causes the distal end of the rotating block to close inward relative to the lead screw.

6. The firing mechanism according to claim 3, characterized in that, A first guiding inclined surface is provided at the end of the convex platform of the rotating block. When the distal end of the rotating block is located at the first lead screw portion, the first guiding inclined surface at the end of the convex platform abuts against the first lead screw portion.

7. The firing mechanism according to claim 2, characterized in that A lead screw connecting portion is further provided between the first lead screw portion and the second lead screw portion, and the outer surface of the lead screw connecting portion is a transition surface.

8. The firing mechanism according to claim 1, characterized in that, Two rotating blocks are provided at the proximal end of the staple pushing rod, and the two rotating blocks are arranged oppositely.

9. The firing mechanism according to claim 8, characterized in that, Two opposite firing portions are provided at the distal end of the firing rod, and the firing portions are axially corresponding to the proximal ends of the two rotating blocks when they are closed.

10. The firing mechanism according to claim 9, characterized in that, The firing rod further includes a firing rod connecting portion between the two firing portions. The inner surface of the firing rod connecting portion is formed as an arc surface recessed outward relative to the lead screw, and the arc surface is adapted to the outer surface of the lead screw.

11. A stapler, characterized in that, It includes the firing mechanism according to any one of claims 1 to 10.

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