Firing mechanism and stapler

Abstract

The present invention provides a firing mechanism and an anastomosis device, which includes a nail pushing assembly, 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 with the connecting portion, and the firing rod and the connecting portion are selectively linked. Through the present invention, when the nail anvil assembly does not reach a suitable position, the connecting portion is in a first state, the firing rod and the connecting portion are not linked, and even if the handle is held, the stapler will not be accidentally fired, and during the resetting process after firing, the safety device is in a fourth state, guiding the connecting portion to enter the first state again, and before the next surgical preparation is completed, the connecting portion is always in the first state, and the stapler cannot be fired again; therefore, the present invention can effectively prevent accidental firing and secondary firing when the fired nail magazine is not replaced, 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 completes a firing with the stapler, the operator may perform the next operation without replacing the new staple cartridge due to carelessness or lack of experience, which may lead to medical accidents, such as resection without suturing, causing great safety hazards. 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 an anastomosis device. When the distance between the anvil assembly and the nail magazine does not reach a suitable position, even if the operating handle is gripped, the nail pushing assembly will not push the nail pushing plate, and will not cause misfiring, and a secondary firing when the fired nail magazine is not replaced can be effectively prevented.

[0007] An embodiment of the present invention provides a firing mechanism for a stapler, the firing mechanism comprising a nail pushing assembly and a safety 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 safety device has a third state and a fourth state;

[0008] When the safety device is in the third state, the connection portion can enter the second state from the first state, and when the safety device is in the fourth state, the connection portion is guided to enter the first state from the second state;

[0009] 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.

[0010] 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;

[0011] When the connecting portion is in the first state, the proximal end of the rotating block opens outward; when the connecting portion is in the second state, the proximal end of the rotating block retracts inward.

[0012] 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;

[0013] 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.

[0014] Optionally, the safety device includes a safety block corresponding to the rotating block one by one, the proximal end of the second screw rod portion is provided with a first groove corresponding to the safety block one by one, the safety block includes a first end and a second end, and the first end of the safety block is rotatably connected to the inner side of the proximal end of the corresponding first groove;

[0015] When the safety device is in the third state, the second end of the safety block rotates toward the distal end side of the first 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 first groove and guides the distal end of the rotating block to move toward the first screw rod portion.

[0016] 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 side of the first groove;

[0017] 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 first 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 comes into contact with the first screw rod.

[0018] Optionally, the first end of the safety block is rotatably mounted on the proximal inner side of the first groove through a safety pin, and a first torsion spring is provided on the safety pin. When the distal end of the rotating block pushes the second end of the safety block to rotate toward the distal side of the first groove, the first torsion spring is deformed. When the rotating block moves toward the distal direction of the stapler until it is disengaged from the safety block, the deformation restoring force of the first torsion spring causes the safety block to rotate toward the proximal direction of the stapler until it protrudes from the first groove.

[0019] Optionally, two rotating blocks are provided at the proximal end of the nail pushing rod, and the rotating blocks are arranged opposite to each other;

[0020] The proximal end of the nail-pushing rod is provided with two first grooves which are communicated with each other, and the first ends of the two safety blocks are rotatably installed in the first grooves through the same safety pin.

[0021] Optionally, the second end of the safety block is provided with a first 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 along the first guiding slope toward the first screw rod portion.

[0022] Optionally, the distal end of the first screw rod portion is provided with a second groove corresponding one-to-one to the rotating block, and a retraction block is respectively arranged in the second groove. When the safety device is in the third state and the screw rod moves toward the distal end direction of the anastomosis device, the rotating block pushes the retraction block toward the proximal side of the second groove.

[0023] Optionally, a retraction compression spring is provided between the retraction block and the proximal side of the second groove, and the retraction compression spring is compressed when the rotating block pushes the retraction block toward the proximal side of the second groove.

[0024] 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 second groove extends from the first screw portion to the screw connecting portion.

[0025] 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.

[0026] Optionally, a mounting groove corresponding to the rotating block is provided at the proximal end of the nail pushing rod, and the distal end of the rotating block is rotatably mounted in the mounting groove via a rotating shaft;

[0027] A second torsion spring is also provided on the rotating shaft. When the connecting portion is in the first state, the second torsion spring is deformed. When the rotating block is separated from the first screw rod portion, the deformation restoring force of the second torsion spring causes the distal end of the rotating block to be retracted inward.

[0028] Optionally, a second guiding slope is provided at the end of the boss of the rotating block, and when the connecting portion is in the first state, the second guiding slope at the end of the boss contacts the first screw rod portion.

[0029] Optionally, the proximal end of the nail pushing rod is provided with two rotating blocks, which are arranged opposite to each other; the distal end of the firing rod is provided with two opposite firing parts, which are axially corresponding to the proximal ends of the two rotating blocks when they are folded;

[0030] The firing rod further comprises a firing rod connecting portion between the two firing portions, the inner surfaces of the firing rod connecting portion are respectively formed as arc surfaces recessed outwardly relative to the screw rod, and the arc surfaces are adapted to the outer surface of the screw rod.

[0031] An embodiment of the present invention further provides a stapler, comprising the firing mechanism.

[0032] The firing mechanism and stapler provided by the present invention have the following advantages:

[0033] 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 accidentally fired 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 normal firing can be performed at this time; and in the resetting process after firing, the safety device is in a fourth state, guiding the connecting part to enter the first state again, and before the next surgical preparation is completed, the connecting part is always in the first state, and the stapler cannot be fired again; therefore, the present invention prevents accidental firing when the surgery is not ready under the premise of ensuring the normal operation of the nail pushing assembly, and at the same time, after the nail anvil assembly and the nail magazine assembly reach a suitable position, it provides a possibility for the doctor to increase the distance between the nail anvil assembly and the nail magazine assembly, and effectively prevents secondary firing when the fired nail magazine has not been replaced, thereby improving the safety of the instrument. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] 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.

[0035] Figure 1 is a schematic structural diagram of a stapler according to an embodiment of the present invention;

[0036] Figure 2 is a schematic diagram of a stapler according to an embodiment of the present invention with one side of the housing removed;

[0037] Figure 3 is a schematic diagram of the cooperation between a pointer and a pull tab according to an embodiment of the present invention;

[0038] 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;

[0039] Figure 5 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;

[0040] 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;

[0041] Figure 7 yes Figure 6 A1-A1 cross-sectional view;

[0042] Figure 8 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;

[0043] Fig. 9It 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;

[0044] Fig.10 yes Fig. 9 A cross-sectional view along the A2-A2 direction;

[0045] Fig.11 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;

[0046] Fig.12 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;

[0047] Fig.13 yes Fig.12 A cross-sectional view along the A3-A3 direction;

[0048] Fig.14 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;

[0049] Fig.15 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;

[0050] Fig.16 yes Fig.15 Cross-sectional view along the A4-A4 direction.

[0051] Reference numerals:

[0052] 11 Stapler body housing 53 Pointer

[0053] 12 Nail magazine assembly 6 Screw rod

[0054] 13 nail anvil assembly 61 first screw rod part

[0055] 2 Pushing rod 611 Second groove

[0056] 21 Proximal end of the push rod 612 Retraction spring

[0057] 3 Rotating block 62 Second screw part

[0058] 31 The distal end 621 of the rotating block The first groove

[0059] 311 Rotating shaft 622 Safety pin

[0060] 312 second torsion spring 623 first torsion spring

[0061] 313 boss 63 screw rod connection

[0062] 314 second guide slope 64 safety block

[0063] 32 Near end 641 of rotating block First safety block

[0064] 321 cavity 642 second safety block

[0065] 4 Firing rod 643 first guide slope

[0066] 41 Distal end of firing rod 65 Retraction block

[0067] 42 Proximal end of firing rod 651 First retraction block

[0068] 43 Firing rod connection part 652 Second retraction block

[0069] 51 Knob 7 Handle

[0070] 52 pull tab DETAILED DESCRIPTION

[0071] 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.

[0072] In order to solve the technical problems in the prior art, the present invention provides a firing mechanism for a stapler, the firing mechanism comprising a nail pushing assembly and a safety 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 safety device has a third state and a fourth state; when the safety device is in the third state, the connecting portion can enter the second state from the first state, and when the safety device is in the fourth state, the connecting portion is guided to enter the first state from the second state; when the connecting portion is in the first state, the firing rod and the connecting portion are not linked, and the stapler cannot be fired; when the connecting portion is in the second state, the firing rod and the connecting portion are linked, and the stapler can be fired.

[0073] The working state of the circular tubular stapler of the present invention is described in four stages below:

[0074] In the initial state where the anvil assembly and the stapler body have just been successfully docked or the tissue has just been inserted, the connecting portion is in the first state, and the firing rod and the connecting portion are not linked. At this time, even if the operator accidentally presses the handle to push the firing rod, the firing rod moves from the proximal end to the distal end of the stapler, and will not drive the connecting portion to move toward the distal end of the stapler, and will not cause the stapler to fire, thereby avoiding accidental firing when the operation is not ready.

[0075] After the surgical firing preparation is completed, the anvil assembly 13 and the stapler assembly 12 reach a suitable distance, the safety device is in the third state, the connecting part enters the second state from the first state, and the firing rod and the connecting part are linked. At this time, the operator presses the handle, and the firing rod can push the connecting part and the stapler push rod toward the distal end of the stapler to fire the stapler.

[0076] After the stapler is fired, the safety device enters the fourth state and guides the connection part to enter the first state from the second state again, and the connection part will remain in the first state. At this time, the firing rod and the connection part are not linked. At this time, even if the operator accidentally holds the handle to push the firing rod, the stapler cannot be fired, thereby effectively preventing the doctor from causing damage to the tissue by firing again after the firing is completed, thereby improving the safety of the instrument.

[0077] Therefore, the present invention, under the premise of ensuring that the nail pushing assembly can work normally after the surgical preparation is completed, prevents the accidental firing of the nail anvil assembly 13 and the nail magazine assembly 12 when they are not in the appropriate position during the operation, and effectively prevents the damage to the tissue caused by the doctor firing again after the firing is completed during the operation, thereby improving the safety of the instrument. The surgical preparation here must at least meet the following two conditions: the distance between the nail anvil assembly and the nail magazine reaches the appropriate position and the nail magazine assembly is installed with a new nail magazine assembly that has not been fired, so as to ensure the smooth completion of the operation.

[0078] The structure of the stapler of the present invention is described in detail below with reference to the accompanying drawings. Figures 4 to 16 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.

[0079] like Figure 1 and Figure 2 FIG. 1 is a diagram showing the structure of a stapler according to an embodiment of the present invention, wherein in order to more clearly show the internal structure of the stapler, Figure 2In the figure, one side of the stapler housing is removed, and the stapler assembly is shown separated from the stapler body. The stapler includes a stapler body and an anvil assembly 13. The stapler body includes a stapler housing 11 and a stapler assembly 12 located at the distal end of the stapler housing 11. The stapler assembly 12 includes an annular stapler, a staple pusher 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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 3The 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.

[0085] 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.

[0086] 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.

[0087] However, some careless or inexperienced operators may want to fire the stapler when the pointer 53 is in the first position area. In this case, the distance between the stapler magazine and the anvil assembly 12 has not reached the appropriate position, which may lead to surgery failure. In addition, when the stapler magazine is not replaced after the stapler is fired, the position of the screw rod 6 has not changed, and the pointer 53 is still in the second position area. The operator may see that the pointer 53 is in the second position area and mistakenly believe that the operation is ready. If he fires the stapler again, the operation will also fail.

[0088] The present invention improves the push pin assembly and the screw rod. Figure 4The figure is a schematic diagram of the structure of the push pin assembly and the screw rod in cooperation with one embodiment of the present invention. The screw rod 6 includes a first screw rod portion 61 at the proximal end of the screw rod 6 and a second screw rod portion 62 at the distal end of the screw rod 6. The outer diameter of the second screw rod portion 62 is smaller than the outer diameter of the first screw rod portion 61, and the screw rod 6 can move axially relative to the stapler body. The proximal end of the second screw rod portion 62 is provided with at least one first groove 621, and a rotatable safety block 64 is fixed to the inner side of the proximal end of each first 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 first 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 outer sleeve of the screw rod 6 is provided with a nail pushing assembly, which 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, and the connecting part includes at least one rotating block 3, the distal end 31 of the rotating block 3 is rotatably connected to the proximal end 21 of the nail pushing rod 2, and the rotating block 3 corresponds to the safety block 64 one by one. The rotating block 3 is linked with the nail pushing rod 2, and the firing rod 4 is selectively linked with the rotating block 3. The proximal end 42 of the firing rod 4 can be linked with the handle 7. When the handle 7 is gripped, the handle 7 can push the firing rod 4 to move from the proximal end to the distal end of the stapler. When the firing rod 4 is linked with the rotating block 3, by holding the handle 7, the nail pushing rod 2 can be pushed through the firing rod 4 and the rotating block 3 to push out the nail magazine and the cutter in the nail magazine assembly 12 at the distal end of the stapler body, thereby completing the firing of the stapler. In order to prevent the stapler from being fired by mistake when the nail anvil assembly is not moved to the appropriate position, the present invention further adds a failure protection mode. When the firing rod 4 is not linked with the rotating block 3, holding the handle 7 will only push the firing rod 4 to move toward the distal end, but will not be able to push the connecting portion 3 and the nail pushing rod 2 to move toward the distal end, and thus the stapler cannot be fired.

[0089] When the safety device is in the third state, the safety block 64 rotates toward the distal side of the first 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 first 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.

[0090] 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.

[0091] like Figures 4 to 7 , which shows a schematic diagram of the circular tubular stapler of this embodiment in the initial state, at which time the circular tubular stapler is in a failure protection mode. Specifically, in the initial state, the safety block 64 does not contact the rotating block 3, and the second end of the safety block 64 protrudes from the first groove 621. The rotating block 3 is located at the first screw rod portion 61, the distal end 31 of the rotating block 3 contacts 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 of the stapler to the distal end, 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, and will not cause the stapler to fire, thereby avoiding misfiring when the operation is not ready.

[0092] 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. The rotating shaft 311 is also provided with a second torsion spring 312. 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 part 62, the deformation recovery force of the second torsion spring 62 causes the distal end 31 of the rotating block 3 to be retracted inward relative to the screw 6.

[0093] 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 .

[0094] 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 first groove 621 through the same safety pin 622. The first groove of the first safety block 641 and the first 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 first groove 621. In other embodiments, the first safety block 641 and the second safety block 642 can also be provided with a first groove 621 respectively, and the two first 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 inner side of the proximal end of the corresponding first 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 first grooves 621 of each safety block 64 can be connected or separated separately.

[0095] 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 first 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 first 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.

[0096] In this embodiment, the distal end of the first screw rod portion 61 is further provided with second grooves 611 corresponding one to one with the rotating block 3, and each second groove 611 is provided with a retraction block 65, and the distal end of the second groove 611 can extend all the way to the screw rod connecting portion 63. The outer surface of the retraction block 65 contacts the rotating block, and the outer surface of the retraction block 65 and its distal end surface are perpendicular to each other. In the initial state, the distal end 31 of the rotating block 3 conflicts with the outer side surface of the retraction block 65. In this embodiment, the retraction block includes a first retraction block 651 and a second retraction block 652. Figure 4 and Figure 5 From the perspective of FIG. 1 , the distal end 31 of the upper rotating block 3 abuts against the upper side of the first retracting block 651, and the distal end 31 of the lower rotating block 3 abuts against the lower side of the second retracting block 652. The function of the retracting block 65 will be combined with the following Figures 14 to 16 Detailed introduction.

[0097] The second end of the safety block 64 is provided with a first 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 first guiding slope 643 until the distal end 31 of the rotating block 3 contacts the first screw rod portion 61. Therefore, the first 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.

[0098] like Figure 5 As shown, a second guiding bevel 314 is provided at the end of the boss 313 of the rotating block 3. In the initial state, the second guiding bevel 314 at the end of the boss 313 conflicts with the first screw part 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 second guiding bevel 314 is not provided, the contact between the end of the boss 313 and the first screw part 61 (or the retraction block 65) is point contact. By providing the second guiding bevel 314, in the initial state, the contact between the boss 313 and the first screw part 61 (or the retraction block 65) becomes surface contact, thereby increasing the contact area between the end of the boss 313 and the first screw part 61, and improving the overall stability of the stapler in the initial state. In addition, during the resetting process after the stapler is fired, the second guiding bevel 314 will contact the distal end of the retraction block 65, pushing the retraction block 65 toward the proximal side of the second groove 611. Without the second guiding bevel 314, the contact between the distal end 31 of the rotating block 3 and the distal end of the retraction block 65 will be point-to-point contact, which is very unstable. After the second guiding bevel 314 is added, the retraction block 65 can be better pushed toward the proximal end.

[0099] 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.

[0100] 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.

[0101] like Figures 8 to 10 The schematic diagram of the structure of the circular tube stapler of 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, so that 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 first 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 produces torsional deformation. Since the distal end surface of the retraction block 65 is perpendicular to the outer surface, 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. 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. That is, the rotating block 3 moves distally to the second screw part 62, and 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 it 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. 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.

[0102] 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 first groove 621.

[0103] like Figures 11 to 13As shown, the structure of the part of the stapler pusher assembly cooperating with the screw rod when the stapler pusher assembly is reset after the stapler of this embodiment is fired is shown. When the stapler pusher 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 of the contact part of the distal end 31 of the rotating block 3 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 avoiding the failure of the operation caused by the secondary firing when the staple cartridge is not replaced.

[0104] exist Figures 8 to 10 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.

[0105] Specifically, Figures 14 to 16 As 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 second 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 second guide bevel 314, so that the retraction block 65 moves toward the proximal side of the second groove 611. A retraction spring 612 is arranged between the proximal side of the second groove 611 and the retraction block 65, and 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.

[0106] 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 is gradually 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, the stapler pusher assembly is 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.

[0107] The firing mechanism and stapler provided by the present invention have the following advantages:

[0108] The present invention provides a firing mechanism for a stapler, when the distance between the nail anvil assembly and the nail magazine does not reach a suitable position, the connecting part is in a first state, the firing rod and the connecting part are not linked, 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. During the resetting process after firing, the safety device is in a fourth state, guiding the connecting part to enter the first state again. Before the preparation for the next operation is completed, the connecting part is always in the first state, and the stapler cannot be fired again; therefore, the present invention prevents misfires when the operation is not ready, and effectively prevents secondary firing when the fired nail magazine is not replaced, while ensuring the normal operation of the nail push assembly. At the same time, after the nail anvil assembly and the nail magazine assembly reach a suitable position, it provides a possibility for the doctor 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, eliminating the uncertain fuzzy zone between the stapler being in a fireable state and an unfireable state, making the operation of the instrument safer.

[0109] 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 and a safety device, 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 comprises at least one rotating block, the distal end of the rotating block is rotatably connected to the proximal end of the nail-pushing rod, the connecting portion is linked with the nail-pushing rod, and the connecting portion has a first state and a second state, the safety device comprises a safety block corresponding to the rotating block one by one, and the safety device has a third state and a fourth state; When the connecting portion is in the first state, the proximal end of the rotating block opens outward, 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 proximal end of the rotating block is retracted inward, the firing rod is linked to the connecting portion, and the stapler can be fired; When the safety device is in the third state, the safety block does not block the distal end of the rotating block from moving in the distal direction, and the connecting portion can enter the second state from the first state. When the safety device is in the fourth state, one end of the safety block guides the distal end of the rotating block to move in the proximal direction, and the connecting portion enters the first state from the second state.

2. The firing mechanism according to claim 1, characterized in that: It also includes a screw rod that passes 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, and the outer diameter of the second screw rod portion is smaller than the outer diameter of the first screw rod portion; 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.

3. The firing mechanism according to claim 2, characterized in that: The proximal end of the second screw rod is provided with a first 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 connected to the inner side of the proximal end of the corresponding first groove; When the safety device is in the third state, the second end of the safety block rotates toward the distal end side of the first 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 first groove and guides the distal end of the rotating block to move toward the first screw rod portion.

4. The firing mechanism according to claim 3, characterized in that: When the screw rod 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 side of the first groove; 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 first 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 comes into contact with the first screw rod.

5. The firing mechanism according to claim 4, characterized in that: The first end of the safety block is rotatably mounted on the proximal inner side of the first groove through a safety pin, and a first torsion spring is arranged on the safety pin. When the distal end of the rotating block pushes the second end of the safety block to rotate toward the distal side of the first groove, the first torsion spring is deformed. When the rotating block moves toward the distal direction of the stapler until it is separated from the safety block, the deformation restoring force of the first torsion spring causes the safety block to rotate toward the proximal direction of the stapler until it protrudes from the first groove.

6. The firing mechanism according to claim 3, characterized in that: The proximal end of the nail pushing rod is provided with two rotating blocks, which are arranged opposite to each other; The proximal end of the nail-pushing rod is provided with two first grooves which are communicated with each other, and the first ends of the two safety blocks are rotatably installed in the first grooves through the same safety pin.

7. The firing mechanism according to claim 3, characterized in that: The second end of the safety block is provided with a first 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 along the first guiding slope toward the first screw rod portion.

8. The firing mechanism according to claim 2, characterized in that: The distal end of the first screw rod portion is provided with a second groove corresponding to the rotating block one by one, and a retraction block is respectively arranged in the second groove. When the safety device is in the third state and the screw rod moves toward the distal end of the anastomosis device, the rotating block pushes the retraction block toward the proximal side of the second groove.

9. The firing mechanism according to claim 8, characterized in that: A retraction compression spring is arranged between the retraction block and the proximal side of the second groove, and the retraction compression spring is compressed when the rotating block pushes the retraction block toward the proximal side of the second groove.

10. The firing mechanism according to claim 9, 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 second groove extends from the first screw portion to the screw connecting portion.

11. The firing mechanism according to claim 2, 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.

12. The firing mechanism according to claim 11, characterized in that: The proximal end of the nail pushing rod is provided with a mounting groove corresponding to the rotating block one by one, and the distal end of the rotating block is rotatably mounted in the mounting groove via a rotating shaft; A second torsion spring is also provided on the rotating shaft. When the connecting portion is in the first state, the second torsion spring is deformed. When the rotating block is separated from the first screw rod portion, the deformation restoring force of the second torsion spring causes the distal end of the rotating block to be retracted inward.

13. The firing mechanism according to claim 11, characterized in that: The end of the boss of the rotating block is provided with a second guiding inclined surface. When the connecting portion is in the first state, the second guiding inclined surface of the end of the boss contacts the first screw rod portion.

14. The firing mechanism according to claim 2, characterized in that: The proximal end of the nail pushing rod is provided with two rotating blocks, which are arranged opposite to each other; the distal end of the firing rod is provided with two opposite firing parts, which are axially corresponding to the proximal ends of the two rotating blocks when they are folded; The firing rod further comprises a firing rod connecting portion between the two firing portions, the inner surfaces of the firing rod connecting portion are respectively formed as arc surfaces recessed outwardly relative to the screw rod, and the arc surfaces are adapted to the outer surface of the screw rod.

15. A stapler, characterized in that: Comprising the firing mechanism of any one of claims 1 to 14.

Images