Firing mechanism and stapler

Abstract

The present invention provides a firing mechanism and an anastomosis device, which include a nail pushing assembly and a retraction device, wherein the nail pushing assembly includes a firing rod, a connecting portion and a nail pushing rod arranged in sequence from the proximal end to the distal end of the anastomosis device, the nail pushing rod is linked to the connecting portion, the connecting portion has a first state that is not linked to the firing rod and a second state that is linked to the firing rod, after the connecting portion enters the second state, if the retraction device enters the fourth state from the third state, the connecting portion can be guided to return to the first state. Through the present invention, when the nail anvil assembly does not reach a suitable position, the connecting portion is in the first state, the firing rod and the connecting portion are not linked, even if the handle is held, the anastomosis device will not be accidentally fired, and after the anastomosis device enters the fireable state, it can be returned to the non-fireable state through the retraction device, 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 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.

[0005] In addition, after the operator operates the stapler to enter the firing state, if the operator finds that the surgical preparation is not perfect or there are other special circumstances and the stapler cannot be fired correctly, it needs to be able to return to the non-fireable state, but the existing staplers cannot achieve this function. Summary of the invention

[0006] In view of the problems in the prior art, the purpose of the present invention is to provide a firing mechanism and a stapler. When the distance between the anvil assembly and the stapler has not reached a suitable position, even if the operating handle is gripped, the stapler pusher assembly will not push the stapler pusher plate, thereby preventing misfiring, and the stapler can return to a non-firing state after entering the firing state.

[0007] An embodiment of the present invention provides a firing mechanism for a stapler, the firing mechanism comprising a nail pushing assembly and a retraction device, 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 is linked with the nail pushing rod, and the connecting portion has a first state and a second state, and the retraction device includes a third state and a fourth state;

[0008] 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;

[0009] The connecting portion is in the second state, and when the retracting device enters the fourth state from the third state, the connecting portion is guided to enter the first state from the second state.

[0010] Optionally, it also includes a screw rod passing through the interior of the push pin assembly, the screw rod includes 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, when the connecting portion is located at the first screw rod portion, the connecting portion is in the first state, and when the connecting portion is located at the second screw rod portion, the connecting portion is in the second state.

[0011] Optionally, the retraction device includes a retraction block, a first groove is formed at the distal end of the first screw rod, the retraction block is arranged in the first groove, when the retraction block is located at the distal end side of the first groove, the retraction block is in the third state, and when the retraction block is located at the proximal end side of the first groove, the retraction block is in the fourth state;

[0012] When the connecting portion enters the first state from the second state, the retraction block is pushed to move from the distal end side to the proximal end side of the first groove.

[0013] Optionally, a retraction compression spring is provided between the retraction block and the proximal side of the first groove, and when the connecting portion pushes the retraction block to move toward the proximal side of the first groove, the retraction compression spring is compressed.

[0014] Optionally, a screw connecting portion is further provided between the first screw portion and the second screw portion, an outer surface of the screw connecting portion is a transition surface, and the first groove extends from the first screw portion to the screw connecting portion.

[0015] Optionally, the outer surface of the retraction block and the distal end surface of the retraction block are perpendicular to each other.

[0016] Optionally, a step portion is provided on the distal side of the first groove, and the step portion defines the distal position of the retraction block.

[0017] Optionally, a driving portion and a limiting portion are provided at the distal end of the retraction block, the limiting portion cooperates with the step portion to limit the distal position of the retraction block, and the driving portion protrudes toward the distal end of the stapler relative to the limiting portion.

[0018] Optionally, the diameter of the second screw rod portion is smaller than the diameter of the first screw rod portion;

[0019] The connecting portion includes at least one rotating block, the rotating block corresponds to the retracting block one by one, the distal end of the rotating block is rotatably connected to the proximal end of the nail pushing rod, when the connecting portion is in the first state, the distal end of the rotating block is located at the first screw rod portion, and the proximal end of the rotating block is opened outward, and when the connecting portion is in the second state, the distal end of the rotating block is located at the second screw rod portion, and the proximal end of the rotating block is retracted inward;

[0020] When the connecting portion is in the second state and the screw rod moves toward the distal end of the stapler, the distal end of the rotating block pushes the retracting block to move toward the proximal end side of the first groove.

[0021] 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;

[0022] A first guiding bevel is provided at the end of the boss of the rotating block. When the connecting portion is in the second state and the screw rod moves toward the distal end of the stapler, the first guiding bevel contacts the distal end of the retraction block and pushes the retraction block to move toward the proximal side of the first groove.

[0023] Optionally, a safety device is further included. When the safety device is in the third state, the connecting part can enter the second state from the first state. When the safety device is in the fourth state, the connecting part is guided to enter the first state from the second state.

[0024] Optionally, the safety device comprises a safety block corresponding to the rotating block one by one, the proximal end of the second screw rod portion is provided with a second groove corresponding to the safety block one by one, the safety block comprises a first end and a second end, and the first end of the safety block is rotatably fixed to the inner side of the proximal end of the corresponding second groove;

[0025] When the safety device is in the third state, the second end of the safety block rotates toward the distal end side of the second groove without blocking the distal end of the rotating block from moving toward the second screw rod portion. When the safety device is in the fourth state, the second end of the safety block protrudes from the second groove and guides the distal end of the rotating block to move toward the first screw rod portion.

[0026] Optionally, when the screw moves toward the proximal end of the stapler, the distal end of the rotating block pushes the second end of the safety block to rotate toward the distal end of the second groove, so that the connecting portion enters the second state;

[0027] When the stapler is fired, the rotating block moves toward the distal end of the stapler until it is disengaged from the safety block, and the second end of the safety block rotates toward the proximal end of the stapler until it protrudes from the second groove. When the rotating block is reset toward the proximal end of the stapler, the distal end of the rotating block passes over the safety block and then collides with the first screw rod portion, and the connecting portion enters the first state.

[0028] Optionally, the second end of the safety block is provided with a second guiding slope inclined toward the first screw rod portion, and when the rotating block is reset toward the proximal end direction of the stapler, the distal end of the rotating block moves toward the first screw rod portion along the second guiding slope.

[0029] An embodiment of the present invention further provides a stapler, comprising the firing mechanism.

[0030] The firing mechanism and stapler provided by the present invention have the following advantages:

[0031] The present invention provides a firing mechanism for a stapler, when the distance between the anvil assembly and the staple magazine has not reached a suitable position, the connecting part is in a first state, the firing rod and the connecting part are not linked, and at this time, the stapler will not be misfired; when the anvil assembly moves to a suitable position, the connecting part is in a second state, the firing rod and the connecting part are linked, and normal firing can be performed at this time; after the connecting part enters the second state, if the retracting device enters the fourth state from the third state, the connecting part can be guided to return to the first state; thereby, not only can misfire of the stapler be effectively prevented under the premise that the normal operation of the stapler can be achieved, but also after the anvil assembly and the staple magazine assembly reach a suitable position, it is possible for the doctor to increase the distance between the anvil assembly and the staple magazine assembly, thereby improving the safety of the instrument use. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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.

[0033] Figure 1 is a schematic structural diagram of a stapler according to an embodiment of the present invention;

[0034] Figure 2 is a schematic diagram of a stapler according to an embodiment of the present invention with one side of the housing removed;

[0035] Figure 3 is a schematic diagram of the cooperation between a pointer and a pull tab according to an embodiment of the present invention;

[0036] Figure 4 It is a schematic structural diagram of the matching parts of the stapler push rod and the screw rod in a failure protection mode of an embodiment of the present invention;

[0037] Figure 5 It is an exploded view of the mating part of the stapler and the screw rod when the stapler according to one embodiment of the present invention is in a failure protection mode;

[0038] Figure 6 It is a bottom view of the mating part of the stapler and the screw rod when the stapler according to one embodiment of the present invention is in a failure protection mode;

[0039] Figure 7 yes Figure 6 A1-A1 cross-sectional view;

[0040] Figure 8 It is a schematic diagram of the cooperation between the retraction block and the screw rod according to an embodiment of the present invention;

[0041] Fig. 9 It is a schematic structural diagram of the matching parts of the stapler push rod and the screw rod in an embodiment of the present invention when the stapler is in a firing mode;

[0042] Fig.10It is a bottom view of the mating part of the stapler and the screw rod of an embodiment of the present invention in a firing mode;

[0043] Fig.11 yes Fig.10 A cross-sectional view along the A2-A2 direction;

[0044] Fig.12 It is a schematic diagram of the mating part of the staple pusher assembly and the screw rod when the stapler according to one embodiment of the present invention returns from the firing mode to the failure protection mode;

[0045] Fig.13 It is a bottom view of the mating part of the staple pusher assembly and the screw rod when the stapler according to one embodiment of the present invention returns from the firing mode to the failure protection mode;

[0046] Fig.14 yes Fig.13 A cross-sectional view along the A3-A3 direction;

[0047] Fig.15 It is a structural schematic diagram of the part of the stapler according to one embodiment of the present invention that cooperates with the screw rod when the stapler pusher assembly is reset after the stapler has been fired;

[0048] Fig.16 A bottom view of the portion of the stapler according to an embodiment of the present invention that cooperates with the lead screw when the staple pusher assembly is reset after the stapler has been fired;

[0049] Fig.17 yes Fig.16 Cross-sectional view along the A4-A4 direction.

[0050] Reference numerals:

[0051] 11 Stapler body housing 61 First screw rod

[0052] 12 Nail cartridge assembly 611 first groove

[0053] 13 Anvil assembly 612 Retraction spring

[0054] 2 Push rod 613 step part

[0055] 21 proximal end of the push rod 62 second screw rod portion

[0056] 3 Rotating block 621 Second groove

[0057] 31 Distal end of rotating block 622 Safety pin

[0058] 311 rotating shaft 623 first torsion spring

[0059] 312 second torsion spring 63 screw rod connection part

[0060] 313 boss 64 safety block

[0061] 314 first guide slope 641 first safety block

[0062] 32 Near end of rotating block 642 Second safety block

[0063] 321 cavity 643 second guide slope

[0064] 4 Trigger rod 65 Retraction block

[0065] 41 The distal end of the firing rod 651 The first retraction block

[0066] 42 proximal end of firing rod 652 second retraction block

[0067] 43 firing rod connection part 653 driving part

[0068] 51 knob 654 limiter

[0069] 52 Pull tab 655 Far end face of the retraction block

[0070] 53 Pointer 656 Outer surface of the rollback block

[0071] 6 Screw 7 Handle DETAILED DESCRIPTION

[0072] 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.

[0073] In order to solve the technical problems in the prior art, an embodiment of the present invention provides a firing mechanism for a stapler, the firing mechanism includes a nail pushing assembly and a retraction device, the nail pushing assembly includes 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 is linked with the nail pushing rod, and the connecting portion has a first state and a second state, and the retraction device includes a third state and a fourth state; when the connecting portion is in the first state, 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 firing rod is linked with the connecting portion, and the stapler can be fired. An embodiment of the present invention also provides a stapler, including the firing mechanism.

[0074] Therefore, by adopting the present invention, when the distance between the anvil assembly and the staple magazine has not reached the appropriate position, the connecting portion is in the first state, and the firing rod and the connecting portion are not linked, and at this time, the stapler will not be accidentally fired. When the anvil assembly moves to the appropriate position, the connecting portion is in the second state, and the firing rod and the connecting portion are linked, and normal firing can be performed at this time, thereby ensuring that accidental firing can be effectively prevented under the premise that the stapler can work normally.

[0075] In addition, when the connecting portion is in the second state and the retracting device enters the fourth state from the third state, the connecting portion is guided to enter the first state from the second state, that is, the stapler is retracted from the firing state to the non-firing state, which is convenient for the operator to adjust the instrument. Therefore, after the anvil assembly and the staple cartridge assembly reach a suitable position, it is possible for the doctor to increase the distance between the anvil assembly and the staple cartridge assembly.

[0076] The following is combined with Figures 1 to 16 The structure of the firing mechanism and the stapler of one embodiment of the present invention is further described. Figures 4 to 17 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.

[0077] 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 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 sheet 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 moves toward or away from the stapler assembly 12.

[0078] 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, the operator holds the handle to operate the stapler. Figure 1 and Figure 2 In the perspective of the present invention, 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] like Figure 3 As 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 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.

[0083] 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 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 12 and the anvil assembly 11 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 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 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 to indicate whether the stapler has completed the surgical preparation and is allowed to fire.

[0084] Here, 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 assembly has reached the firing position, or without visual indication.

[0085] However, some careless or inexperienced operators may want to fire the stapler when the pointer 53 is in the first position area. At this time, the distance between the stapler cartridge and the staple anvil assembly 12 is not at a suitable position, which may cause the operation to fail. In addition, after the operator operates the stapler from the non-fireable state to the fireable state, if the operator finds that the surgical preparation is not perfect or there are other special circumstances and the stapler cannot be fired correctly, it is necessary to be able to return to the non-fireable state.

[0086] The present invention improves the firing mechanism. Figures 4 to 8 As shown, the firing mechanism of this embodiment includes a nail pushing assembly and a retraction device, wherein the nail pushing assembly includes a firing rod 4, a connecting part and a nail pushing rod 2 arranged in sequence from the proximal end to the distal end of the stapler, wherein the connecting part is linked with the nail pushing rod 2, and the connecting part has a first state and a second state, and the retraction device includes a third state and a fourth state; when the connecting part is in the first state, the firing rod 4 is not linked with the connecting part, and the stapler cannot be fired, so as to prevent the stapler from being fired accidentally; when the connecting part is in the second state, the firing rod 4 is linked with the connecting part, and the stapler can be fired. When the connecting part is in the second state and the retraction device enters the fourth state from the third state, the connecting part is guided to enter the first state from the second state, that is, to retract from the firing state to the firing state. In this way, not only can the stapling device be effectively prevented from being fired accidentally under the premise that the stapler can work normally, but also after the anvil assembly and the staple cartridge assembly reach a suitable position, it provides the possibility for the doctor to increase the distance between the anvil assembly and the staple cartridge assembly.

[0087] In this embodiment, the firing mechanism also includes a screw rod 6 passing through the interior of the pin pusher assembly, the screw rod 6 includes a first screw rod portion 61 and a second screw rod portion 62, the second screw rod portion 62 is located at the distal end of the first screw rod portion 61, when the connecting portion is located at the first screw rod portion 61, the connecting portion is in a first state, and when the connecting portion is located at the second screw rod portion 62, the connecting portion is in a second state.

[0088] The retraction device includes a retraction block 65. A first groove 611 is opened at the distal end of the first screw rod part 61. The retraction block 65 is arranged in the first groove 611. When the retraction block 65 is located on the distal side of the first groove 611, the retraction block 65 is in the third state. When the retraction block 65 is located on the proximal side of the first groove 611, the retraction block 65 is in the fourth state. When the connecting part enters the first state from the second state, the retraction block 65 is pushed to move from the distal side to the proximal side of the first groove 611.

[0089] Furthermore, a retraction compression spring 612 is arranged between the retraction block 65 and the proximal side of the first groove 611. When the connecting part pushes the retraction block 65 to move toward the proximal side of the first groove 611, the retraction compression spring 612 is compressed. After the retraction block 65 is released from the pressure of the connecting part, that is, after the external force on the retraction block 65 is eliminated, the deformation recovery force of the retraction compression spring 612 can push the retraction block 65 to move toward the distal side of the first groove.

[0090] Furthermore, a screw connecting portion 63 is provided between the first screw portion 61 and the second screw portion 62, and the outer surface of the screw connecting portion 63 is a transition surface, and the first groove 611 extends from the first screw portion 61 to the screw connecting portion 63. The transition surface is, for example, an inclined surface.

[0091] In this embodiment, the outer surface of the retraction block 65 is preferably perpendicular to the distal surface of the retraction block 65. When the screw rod 6 moves toward the proximal end, the connecting portion moves from the first screw rod portion to the second screw rod portion. Since there is no transition surface in the moving trajectory of the connecting portion, the rotating block 3 will suddenly and cleanly disengage from the retraction block 65 when it disengages from the rotating block 3. That is, the conversion of the connecting portion between the first state and the second state is a clean mutation, which eliminates the uncertain fuzzy zone between the fireable state and the unafireable state of the stapler, making the operation of the instrument safer.

[0092] like Figure 8 As shown, a step portion 613 is provided at the distal end side of the first groove 611, and the step portion 613 defines the distal end position of the retraction block 65. A driving portion 653 and a limiting portion 654 are provided at the distal end of the retraction block 65, and the limiting portion 654 cooperates with the step portion 613 to define the distal end position of the retraction block 65, and the driving portion 653 protrudes toward the distal end direction of the stapler relative to the limiting portion 654. When the connecting portion pushes the retraction block 65, the connecting portion is in direct contact with the driving portion 653.

[0093] In this embodiment, the diameter of the second screw part 62 is smaller than the diameter of the first screw part 61. The connecting part includes at least one rotating block 3, and the rotating block 3 corresponds to the retracting block 65 one by one. The distal end 31 of the rotating block 3 is rotatably connected to the proximal end 21 of the nail pushing rod 2. When the connecting part is in the first state, the distal end of the rotating block 3 is located at the first screw part 61, and the proximal end 32 of the rotating block 3 is opened outward. At this time, when the handle 7 is held, the firing rod 4 will enter the cavity 321 surrounded by the rotating block 3 and the screw 6, and will not be linked with the rotating block 3, and will not fire the stapler. When the connecting part is in the second state, when the distal end 31 of the rotating block 3 is located at the second screw part 62, the proximal end 32 of the rotating block 3 is retracted inwardly. At this time, when the handle 7 is held, the firing rod 4 will push the rotating block 3 to move toward the distal end of the stapler to fire the stapler. When the connecting portion is in the second state and the screw rod 6 moves toward the distal end of the anastomosis device, the distal end 31 of the rotating block 3 pushes the retraction block 65 to move toward the proximal side of the first groove 611, so that the retraction block 65 enters the fourth state from the third state, and the distal end 31 of the rotating block 3 moves to the first screw rod portion 61, and the connecting portion retracts to the first state.

[0094] In this embodiment, a boss 313 is provided on the inner wall of the distal end 31 of the rotating block 3. When the connecting portion is in the first state, the boss 313 of the rotating block 3 abuts against the first screw portion 61. 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, on the right side of the mounting groove shown in the figure, and is not restricted by the mounting groove. A second torsion spring 312 is also provided on the rotating shaft 311. In the initial state, the second torsion spring 312 is deformed. When the distal end 31 of the rotating block 3 is located at the second screw portion 62, the deformation recovery force of the second torsion spring 62 causes the distal end 31 of the rotating block 3 to retract inward relative to the screw 6.

[0095] 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.

[0096] In addition, when the stapler is fired but the stapler magazine is not replaced, since the position of the screw rod 6 does not change, the pointer 53 is still in the second position area. The operator may see the pointer 53 in the second position area and mistakenly believe that the operation is ready. If the stapler is fired again, the operation will also fail.

[0097] In order to further prevent the stapler from being fired a second time, the firing mechanism of this embodiment also includes a safety device. When the safety device is in the third state, the connecting part can enter the second state from the first state. When the safety device is in the fourth state, the connecting part is guided to enter the first state from the second state.

[0098] Specifically, at least one second groove 621 is provided at the proximal end of the second screw rod portion 62, and a rotatable safety block 64 is fixed to the inner side of the proximal end of each second groove 621. The safety block 64 is the safety device, and the first end of the safety block 64 is rotatably connected to the inner side of the proximal end of the second groove 621. Here, the first end of the safety block 64 refers to the end close to the axis of the screw rod 6, and the second end refers to the end away from the axis of the screw rod 6. For the safety block 642 arranged relatively at the upper end, the first end of the safety block 641 is the bottom end of the safety block 641, and the second end is the top end of the safety block 641. For the safety block 642 arranged relatively at the lower end, the first end of the safety block 642 is the top end of the safety block 642, and the second end is the bottom end of the safety block 642. The rotating block 3 is arranged correspondingly to the safety block 64.

[0099] When the safety device is in the third state, the safety block 64 rotates toward the distal side of the second groove 621 without blocking the distal end of the rotating block 3 from moving toward the second screw rod portion 62, that is, the connecting portion can enter the second state from the first state. When the safety device is in the fourth state, that is, when the safety block 64 is in the fourth state, the second end of the safety block 64 protrudes from the second groove 621 and can guide the rotating block 3 to move toward the first screw rod portion 61, that is, the safety block 64 guides the connecting portion from the second state to the first state.

[0100] The following describes the status of the stapler at each stage. Figures 4 to 8 The figure shows the state of the stapler in the fail-safe mode. Figures 9-11 The stapler is shown in a state in a firing mode; Figures 12-14 The diagram shows the state of the stapler when it returns from the fireable mode to the fail-safe mode; Figures 15 to 17 The figure shows the state of the stapler when it is reset after firing.

[0101] like Figures 4 to 8As 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 where the staple magazine assembly 12 and the staple anvil assembly 13 have just been successfully docked or the initial state where the tissue has just been taken in, the safety block 64 does not contact the rotating block 3, and the second end of the safety block 64 protrudes from the second groove 621. The rotating block 3 is located at the first screw rod portion 61, the distal end 31 of the rotating block 3 is in contact with the first screw rod portion 61, and the proximal end 32 of the rotating block 3 is opened 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 to 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 pushing rod 2 to move distally, nor will it cause the stapler to fire, thereby avoiding accidental firing when the anvil assembly 13 and the nail magazine assembly 12 have not reached the appropriate position.

[0102] In this embodiment, the safety block 64 is correspondingly provided with two upper and lower blocks: a first safety block 641 and a second safety block 642, and the first safety block 641 and the second safety block 642 are rotatably installed in the second groove 621 through the same safety pin 622. The first groove of the first safety block 641 and the second groove 621 of the second safety block 642 are connected up and down, and it can also be said that the two safety blocks share a second groove 621. In other embodiments, the first safety block 641 and the second safety block 642 can also be provided with a second groove 621 respectively, and the two second grooves 621 are not connected to each other, and the first safety block 641 and the second safety block 642 are rotatably connected to the proximal inner side of the corresponding second groove 621 through a safety pin 622. In other embodiments, if the number of rotating blocks 3 changes, the number of safety blocks 64 can also change accordingly, and the second grooves 621 of each safety block 64 can be connected or separated separately.

[0103] In this embodiment, a first torsion spring 623 is provided on the safety pin 622. When the anvil assembly 13 moves toward the proximal end during surgical preparation, that is, when the screw rod 6 moves toward the proximal end of the stapler, the distal end 31 of the rotating block 3 pushes the second end of the safety block 64 to rotate toward the distal side of the second groove 621, and the first torsion spring 623 is deformed. When the anvil assembly 13 and the stapler assembly 12 reach a suitable position and the stapler is fired, the rotating block 3 moves toward the distal end of the stapler to disengage from the safety block 64, and the deformation recovery force of the first torsion spring 623 restores the safety block 64 to its initial state, that is, the second end of the safety block 64 rotates toward the proximal end of the stapler to protrude from the second groove 621. Specifically, the closing process during surgical preparation, the state of the safety block 64 when the stapler is fired, and the state of the safety block 64 when the stapler is reset will be described in detail below.

[0104] The second end of the safety block 64 is provided with a second guiding slope 643 inclined toward the first screw rod portion 61. After the stapler is fired, when the rotating block 3 moves toward the proximal end of the stapler to reset, the distal end 31 of the rotating block 3 moves along the second guiding slope 643 until the distal end 31 of the rotating block 3 contacts the first screw rod portion 61. Therefore, the second guiding slope 643 can better serve as a transition between the second screw rod portion 62 and the first screw rod portion 61, and guide the movement of the rotating block 3 toward the proximal end of the stapler.

[0105] The end of the boss 313 of the rotating block 3 is provided with a first guiding bevel 314. In the initial state, the first guiding bevel 314 at the end of the boss 313 conflicts with the first screw rod portion 61, and in this embodiment, conflicts with the outer side surface of the retraction block 65. 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 retraction block 65 is point contact. By providing the first guiding bevel 314, in the initial state, the contact between the boss 313 and the retraction block 65 becomes a 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. In addition, during the resetting process of the stapler after firing, the first guiding bevel 314 will contact the distal end of the retraction block 65, pushing the retraction block 65 toward the proximal side of the first groove 611. Without the first guiding slope 314, the distal end 31 of the rotating block 3 and the distal end of the retracting block 65 would be in point-to-point contact, which is very unstable. However, after the first guiding slope 314 is added, the retracting block 65 can be pushed toward the proximal end better.

[0106] 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 that they can be linked 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 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 shape of the screw rod 6. It can be understood 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.

[0107] like Figures 9-11 The schematic diagram of the structure of the circular tube type stapler in the present invention when the nail anvil assembly and the nail magazine assembly reach the appropriate position during the operation is shown, and the stapler is in a normal firing mode at this time. During the operation preparation, the operator turns the knob 51 at the proximal end to drive the screw 6 to move toward the proximal end of the stapler. During the movement of the screw 6, after the rotating block 3 contacts the safety block 64, a thrust is given to the second end of the safety block 64 toward the distal end of the stapler. Therefore, the distal end 31 of the rotating block 3 pushes the second end of the safety block 64 to rotate toward the distal end of the second groove 621 in the third state, so as to achieve the safety block 64 to avoid the rotating block 3, and the first torsion spring 623 is torsionally deformed. Since the distal end surface 655 of the retraction block 65 is perpendicular to the outer surface 656, when the screw 6 moves toward the proximal end, due to the lack of a transition surface, the rotating block 3 will suddenly and cleanly disengage from the retraction block 65 when it disengages from the retraction block 65. When the distal end 31 of the rotating block 3 is located at the second screw part 62, since the outer diameter of the second screw part 62 is smaller than the outer diameter of the first screw part 61, the proximal end 32 of the rotating block 3 is retracted inwardly relative to the screw 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 is linked with the rotating block 3. During the firing process, when the distal end of the rotating block 3 moves relative to the second screw part 62, the distal end 31 of the rotating block 3 can pass over the safety block 64 and collide with the second screw part 62, or can pass over the safety block 64 and then be suspended, that is, the outer diameter of the second screw part 62 can be designed to be smaller, or the distal end 31 of the rotating block 3 conflicts with the second end of the safety block 64, etc., all of which can achieve the purpose of retracting the proximal end 32 of the rotating block 3 inwardly. 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 from causing an increase in the firing force during the anastomosis.

[0108] 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.

[0109] When the stapler is fired, the rotating block 3 moves toward the distal end of the stapler until the rotating block 3 is disengaged from the safety block 64, and the rotating block 3 comes to the distal side of the safety block 64. The second end of the safety block 64 loses the force of the rotating block 3 and recovers to the fourth state under the action of the first torsion spring 623, that is, the second end of the safety block 64 rotates toward the proximal end of the stapler until it protrudes from the second groove 621.

[0110] exist Figures 9-11 In the state, the stapler is already in the firing mode, and the proximal end 32 of the rotating block 3 is retracted inwardly relative to the screw rod 6. At this time, if the handle 7 is held, the stapler can be fired in sequence through the firing rod 4, the rotating block 3 and the nail pushing rod 2. In this state, if the operator finds that the surgical preparation is not perfect or there are other special circumstances that require returning to the failure protection mode, this function can be achieved through the retraction block 65. For example, at this time, the operator needs to increase the distance between the staple magazine assembly 12 and the nail anvil assembly 13, that is, the knob 311 will be rotated in the opposite direction, and the screw rod 6 will move toward the distal end. At this time, the retraction block 65 will be pushed to the proximal end by the rotating block 3, and at the same time, the retraction compression spring 612 will be compressed.

[0111] Specifically, Figures 12-14As shown, it is a schematic diagram of the mating part of the nail pushing assembly and the screw rod when the stapler of one embodiment of the present invention returns from the firing mode to the failure protection mode. In the firing mode, the boss 313 of the distal end 31 of the rotating block 3 is located between the retraction block 65 and the safety block 64. At this time, it is only necessary to rotate the knob 51 in the second direction, which is opposite to the first direction, and the screw rod 6 drives the nail anvil axis to move in the opposite direction toward the distal end of the stapler again, and the first end of the pointer 53 returns to the first position area. At this time, the first guide bevel 314 of the distal end 31 of the rotating block 3 contacts the distal end of the retraction block 65, and the rotating block 3 gives the retraction block 65 a thrust in the proximal direction of the stapler through the first guide bevel 314, so that the retraction block 65 moves toward the proximal side of the first groove 611. The retraction spring 612 is compressed and deformed by the retraction block 65. As the distal end 31 of the rotating block 3 moves toward the proximal end of the stapler, the proximal end 32 of the rotating block 3 gradually opens outward relative to the screw rod 6, and the stapler returns to the failure protection mode, and the rotating block 3 and the firing rod 4 are no longer linked.

[0112] When the stapler is fired, the stapler pusher assembly moves proximally under the action of the reset structure, that is, during this process, the rotating block 3 also moves proximally, and when passing through the safety block 6, it will gradually be stretched open along the first guide slope 643 of the safety block to form a cavity 321. At this time, the safety block 64 is in the fourth state, and the connecting part will always be in the first state. The firing rod 4 is not linked to the connecting part, and the stapler is in an invalid state and cannot be fired.

[0113] like Figures 15 to 17 As shown, the structure of the part of the stapler assembly that cooperates with the screw rod when the stapler is reset after the stapler of this embodiment is fired is shown. When the stapler assembly is reset, the safety device is in the fourth state, the rotating block 3 is reset toward the proximal end of the stapler, and the distal end 31 of the rotating block 3 first contacts the safety block 64. In this embodiment, the second end of the safety block 64 is provided with a first guiding slope 643 facing the first screw rod 61, and the rotating block 3 moves toward the proximal end of the stapler along the first guiding slope 643. As the outer diameter of the screw rod 6 that the distal end 31 of the rotating block 3 contacts becomes larger and larger, the proximal end 32 of the rotating block 3 will slowly expand outward, so that the firing rod 4 and the rotating block 3 become non-linked again, that is, the stapler is still in the failure protection mode. If the handle 7 is not held carefully to push the firing rod 4, the firing rod 4 will still enter the cavity 321 between the rotating block 3 and the screw rod 6, thereby preventing the doctor from causing damage to the tissue after firing again.

[0114] The firing mechanism and stapler provided by the present invention have the following advantages:

[0115] The present invention provides a firing mechanism for a stapler, when the distance between the nail anvil assembly and the nail magazine has not reached a suitable position, the connecting part is in a first state, the firing rod and the connecting part are not linked, and the stapler will not be misfired at this time. When the nail anvil assembly moves to a suitable position, the connecting part is in a second state, the firing rod and the connecting part are linked, and the stapler can be fired normally at this time. After the connecting part enters the second state, if the retracting device enters the fourth state from the third state, the connecting part can be guided to return to the first state; thereby, not only can the misfire of the stapler be effectively prevented, but also after the nail anvil assembly and the nail magazine assembly reach a suitable position, the doctor needs to increase the distance between the nail anvil assembly and the nail magazine assembly, thereby improving the safety of the use of the instrument. At the same time, the conversion of the connecting part between the first state and the second state is a clean mutation, which eliminates the uncertain fuzzy zone between the stapler being in a firing state and an unfireable state, making the operation of the instrument safer.

[0116] 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 firing mechanism, characterized in that: Used for a stapler, the firing mechanism comprises a nail pushing assembly, a retracting device and a screw rod penetrating the inside of the nail pushing assembly, the screw rod comprises a first screw rod portion and a second screw rod portion, a first groove is provided at the distal end of the first screw rod portion, the second screw rod portion is located at the distal end of the first screw rod portion, the nail pushing assembly comprises 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 is linked with the nail pushing rod, when the connecting portion is located at the first screw rod portion, the connecting portion is in a first state, and when the connecting portion is located at the second screw rod portion, the connecting portion is in a second state; Wherein, the retraction device comprises a retraction block arranged in the first groove, when the retraction block is located at the distal end side of the first groove, the retraction block is in a third state, and when the retraction block is located at the proximal end side of the first groove, the retraction block is in a fourth state; 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; The connecting portion is in the second state, and when the retracting device enters the fourth state from the third state, the connecting portion is guided to enter the first state from the second state.

2. The firing mechanism according to claim 1, characterized in that: When the connecting portion enters the first state from the second state, the retraction block is pushed to move from the distal end side to the proximal end side of the first groove.

3. The firing mechanism according to claim 2, characterized in that: A retraction compression spring is arranged between the retraction block and the proximal side of the first groove, and when the connecting portion pushes the retraction block to move toward the proximal side of the first groove, the retraction compression spring is compressed.

4. The firing mechanism according to claim 2, characterized in that: A screw connecting portion is further provided between the first screw portion and the second screw portion, an outer surface of the screw connecting portion is a transition surface, and the first groove extends from the first screw portion to the screw connecting portion.

5. The firing mechanism according to claim 2, characterized in that: The outer surface of the retraction block and the distal end surface of the retraction block are perpendicular to each other.

6. The firing mechanism according to claim 2, characterized in that: A step portion is provided on the distal end side of the first groove, and the step portion defines the distal end position of the retraction block.

7. The firing mechanism according to claim 6, characterized in that: The distal end of the retraction block is provided with a driving portion and a limiting portion, the limiting portion cooperates with the step portion to limit the distal position of the retraction block, and the driving portion protrudes toward the distal end direction of the stapler relative to the limiting portion.

8. The firing mechanism according to claim 2, characterized in that: The diameter of the second screw rod portion is smaller than the diameter of the first screw rod portion; The connecting portion includes at least one rotating block, the rotating block corresponds to the retracting block one by one, the distal end of the rotating block is rotatably connected to the proximal end of the nail pushing rod, when the connecting portion is in the first state, the distal end of the rotating block is located at the first screw rod portion, and the proximal end of the rotating block is opened outward, and when the connecting portion is in the second state, the distal end of the rotating block is located at the second screw rod portion, and the proximal end of the rotating block is retracted inward; When the connecting portion is in the second state and the screw moves toward the distal end of the stapler, the distal end of the rotating block pushes the retracting block to move toward the proximal end side of the first groove.

9. The firing mechanism according to claim 8, characterized in that: The inner wall of the distal end of the rotating block is provided with a boss, and when the connecting portion is in the first state, the boss of the rotating block abuts against the first screw rod portion; A first guiding bevel is provided at the end of the boss of the rotating block. When the connecting portion is in the second state and the screw rod moves toward the distal end of the stapler, the first guiding bevel contacts the distal end of the retraction block and pushes the retraction block to move toward the proximal side of the first groove.

10. The firing mechanism according to claim 8, characterized in that: It also includes a safety device, which includes a safety block corresponding to the rotating block one by one, and a second groove corresponding to the safety block is provided at the proximal end of the second screw rod part, and the safety block includes a first end and a second end, and the first end of the safety block can be rotatably fixed to the inner side of the proximal end of the corresponding second groove; when the safety device is in a fifth state, the second end of the safety block rotates toward the distal end side of the second groove without blocking the distal end of the rotating block from moving toward the second screw rod part, and the connecting part can enter the second state from the first state, and when the safety device is in a sixth state, the second end of the safety block protrudes from the second groove and guides the distal end of the rotating block to move in the direction of the first screw rod part, and the safety block guides the connecting part to enter the first state from the second state.

11. The firing mechanism according to claim 10, characterized in that: When the screw moves toward the proximal end of the stapler, the distal end of the rotating block pushes the second end of the safety block to rotate toward the distal end of the second groove, so that the connecting portion enters the second state; When the stapler is fired, the rotating block moves toward the distal end direction of the stapler until it is disengaged from the safety block, and the second end of the safety block rotates toward the proximal end direction of the stapler until it protrudes from the second groove. When the rotating block is reset toward the proximal end direction of the stapler, the distal end of the rotating block passes over the safety block and then collides with the first screw rod portion, and the connecting portion enters the first state.

12. The firing mechanism according to claim 11, characterized in that: The second end of the safety block is provided with a second guiding slope inclined toward the first screw rod portion. When the rotating block is reset toward the proximal end of the stapler, the distal end of the rotating block moves toward the first screw rod portion along the second guiding slope.

13. A stapler, characterized in that: Comprising the firing mechanism of any one of claims 1 to 12.

Images