Firing mechanism and stapler

Abstract

The present invention provides a firing mechanism and an anastomosis device, which includes a nail pushing assembly, the nail pushing assembly includes a selectively linked connecting portion and a firing rod, and a safety device is provided on the connecting portion. Through the present invention, when the distance between the nail anvil assembly and the nail magazine does not reach a suitable position, the connecting portion is in a first state, the firing rod and the connecting portion are not linked, and the stapler will not be misfired at this time. When the nail anvil assembly moves to a suitable position, the connecting portion is in a second state, the firing rod and the connecting portion are linked, and normal firing can be performed at this time. During the resetting process after firing, the safety device is in a fourth state, the connecting portion cannot enter the second state from the first state, 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 not only prevent misfires when the surgery is not ready, but also effectively prevent secondary firings when the fired nail magazine has not been replaced.

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 circular tubular stapler. When the distance between the anvil assembly and the staple magazine does not reach an appropriate position, even if the operating handle is gripped, the staple push assembly will not push the staple push plate, thereby preventing misfiring and effectively preventing secondary firing when the fired staple magazine has not been replaced.

[0007] An embodiment of the present invention provides a firing mechanism for a stapler, comprising a nail pushing assembly, wherein the nail pushing assembly comprises a firing rod and a connecting portion at the distal end of the firing rod, wherein the connecting portion has a first state and a second state, and a safety device is provided on the connecting portion, wherein the safety device comprises 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 cannot enter the second state from the first 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 two rotating arms arranged opposite to each other, and the distal end of the firing rod is opposite to the second ends of the two rotating arms. When the connecting portion is in the first state, the first ends of the two rotating arms are retracted inwardly, and the second ends of the two rotating arms are opened outwardly. When the connecting portion is in the second state, the first ends of the two rotating arms are opened outwardly, and the second ends of the two rotating arms are retracted inwardly.

[0011] Optionally, the safety device includes two safety pins, which are respectively arranged on the inner sides of the first ends of the two rotating arms; when the safety device is in the third state, the ends of the two safety pins approach each other to enter a blocking state, and when the safety device is in the fourth state, the ends of the two safety pins move away from each other to enter a yielding state.

[0012] Optionally, the firing mechanism further comprises a screw rod, a top block groove is formed on the screw rod, a bottom end of a top block is rotatably fixed to the distal end side of the top block groove, and the top block comprises a first position area and a second position area;

[0013] When the top block is in the first position area, the top block does not contact the two rotating arms, and the first ends of the two rotating arms are retracted. When the top block is in the second position area, the top end of the top block protrudes from the top block groove and enters between the first ends of the two rotating arms to push the first ends of the two rotating arms outward.

[0014] Optionally, when the top block moves from the first position area to the second position area, the top end of the top block protrudes from the top block groove, the safety pin enters a yielding state under the pressure of the top block, and the top block enters between the first ends of the two rotating arms;

[0015] When the stapler is fired, the rotating arm moves toward the distal end of the stapler until it is disengaged from the top block, and the safety pin returns to a blocking state. When the rotating arm is reset toward the proximal end of the stapler, the safety pin presses the top end of the top block into the top block groove.

[0016] Optionally, a pin hole is provided on the inner side of the first ends of the two rotating arms, a compression spring is provided in the pin hole, and the safety pin is provided in the pin hole. When the top block enters between the first ends of the two rotating arms, the safety pin enters the pin hole due to the pressure of the top block. After the rotating arm is separated from the top block, the restoring force of the compression spring causes the safety pin to extend out of the pin hole.

[0017] Optionally, a first guiding slope is provided on the distal end side of the safety pin, and when the top block enters between the first ends of the two rotating arms, the first guiding slope is subjected to the pressure of the top block so that the safety pin enters the pin hole.

[0018] Optionally, the first end of the safety pin is rotatably connected to the inner side of the rotating arm, and the first end of the safety pin is provided with a swing reset structure. In an initial state, the safety pin extends toward the rotating arm on the opposite side. When the top block enters between the first ends of the two rotating arms, the safety pin is pushed by the top block toward the proximal end of the anastomosis device and swings toward the proximal end of the rotating arm. After the rotating arm is separated from the top block, the reset force of the swing reset structure restores the safety pin to its initial state.

[0019] Optionally, a reset structure is provided on the top block. When the top end of the top block enters the top block groove due to external force, the reset structure is deformed. After the external force is eliminated, the reset force of the reset structure causes the top end of the top block to rotate toward the distal end of the top block groove until it protrudes from the top block groove.

[0020] Optionally, the nail pushing assembly further comprises a nail pushing rod located at the distal ends of the two rotating arms, and the rotating arms are linked to the nail pushing rod;

[0021] When the top block is located in the first position area, the proximal end of the nail pushing rod presses the top block so that the top end of the top block deflects toward the proximal end of the top block slot and does not move in conjunction with the rotating arm;

[0022] When the top block moves from the first position area to the second position area, the top end of the top block gradually breaks away from the suppression of the proximal end of the nail pushing rod, and the top block rotates under the action of the reset structure until the top end of the top block protrudes from the top block groove and enters between the first ends of the two rotating arms.

[0023] Optionally, an open cavity is provided at a position corresponding to the proximal end of the push rod and the top block groove, and when the top block moves from the first position area to the second position area, the top end of the top block protrudes out of the top block groove and enters the open cavity, and further enters between the first ends of the two rotating arms from the open cavity.

[0024] Optionally, a second guiding slope is provided on the distal side of the first end of the rotating arm, and when the top block moves from the first position area to the second position area, the second guiding slope of the rotating arm contacts the top block and guides the top block to enter between the first ends of the two rotating arms.

[0025] Optionally, the proximal side of the top block is provided with two third guiding inclined surfaces corresponding to the two rotating arms;

[0026] When the top block moves from the first position area to the second position area, the third guide slope of the top block contacts the first ends of the two rotating arms respectively and guides the top block to enter between the first ends of the two rotating arms.

[0027] Optionally, a tension spring is connected between the first ends of the two rotating arms, and when the top block is not in contact with the rotating arm, under the action of the tension spring, the first ends of the two rotating arms are retracted inward.

[0028] Optionally, the inner surfaces of the rotating arms are respectively formed as arc surfaces that are recessed outward relative to the screw rod, and the arc surfaces are adapted to the shape of the outer surface of the screw rod.

[0029] Optionally, the second end of the rotating arm is further provided with a driving arm extending toward the proximal end of the stapler, and when the second ends of the two rotating arms are retracted, the firing rod contacts the proximal side of the driving arm and then links with the rotating arm.

[0030] Optionally, the stapler further comprises an operating handle, and the operating handle can drive the firing rod to move from the proximal end to the distal end of the stapler.

[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; during the resetting process after firing, the safety device is in a fourth state, the connecting part cannot enter the second state from the first state, and 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 accidental firing when the operation is not ready, and effectively prevents secondary firing when the fired nail magazine has not been replaced, while ensuring the normal operation of the nail pushing assembly, 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 cooperation between the push pin assembly and the screw rod in the initial state of an embodiment of the present invention;

[0039] Figure 5 and Figure 6 It is an exploded view of the cooperation between the push pin assembly and the screw rod in the initial state of an embodiment of the present invention;

[0040] Figure 7 yes Figure 6 Enlarged view of the M in the middle;

[0041] Figure 8 It is a schematic diagram of the cooperation between the ejector block, the ejector pin and the torsion spring according to one embodiment of the present invention;

[0042] Fig. 9 It is a top view of the push pin assembly and the screw rod in the initial state of an embodiment of the present invention;

[0043] Fig.10 yes Fig. 9 Sectional view along the A1-A1 direction;

[0044] Fig.11 It is a structural schematic diagram of the cooperation between the pin pusher assembly and the screw rod after surgical preparation according to an embodiment of the present invention;

[0045] Fig.12 It is a top view of the pin pusher assembly and the screw rod after surgical preparation according to an embodiment of the present invention;

[0046] Fig.13 yes Fig.12 Sectional view along the A2-A2 direction;

[0047] Fig.14 It is a schematic structural diagram of the cooperation between the stapler pusher assembly and the screw rod after the stapler according to one embodiment of the present invention is fired;

[0048] Fig.15 It is a top view of the stapler according to one embodiment of the present invention after firing, in which the staple pusher assembly cooperates with the screw rod;

[0049] Fig.16 yes Fig.15 Sectional view along the A3-A3 direction;

[0050] Fig.17 It is a structural schematic diagram of the cooperation between the stapler pusher assembly and the screw rod when the stapler is reset after firing according to one embodiment of the present invention;

[0051] Fig.18 It is a top view of the stapler pusher assembly cooperating with the screw rod when the stapler is reset after firing according to one embodiment of the present invention;

[0052] Fig.19 yes Fig.18 Cross-sectional view along the A3-A3 direction.

[0053] Reference numerals:

[0054] 11 Stapler body housing 4 Trigger rod

[0055] 12 Nail cartridge assembly 41 Distal end of firing rod

[0056] 13 nail anvil assembly 42 proximal end of firing rod

[0057] 2 Push rod 51 Knob

[0058] 21 proximal end of the push rod 52 pull tab

[0059] 22 Open cavity 53 Pointer

[0060] 3 Rotating arm 6 Screw

[0061] 31 first end of the rotating arm 61 top block groove

[0062] 311 protrusion 611 distal end of top block groove

[0063] 312 tension spring 612 near end of top block groove

[0064] 313 second guide slope 62 top block

[0065] 314 Pin hole 621 Top of top block

[0066] 315 Compression spring 622 Bottom of top block

[0067] 32 The second end of the rotating arm 623 The third guiding slope

[0068] 321 cavity 63 torsion spring

[0069] 322 drive arm 64 ejector pin

[0070] 33 Safety pin 7 Handle

[0071] 331 First guide slope 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 of the prior art, the present invention provides a firing mechanism for a stapler, including a nail pushing assembly, the nail pushing assembly including a firing rod and a connecting portion located at the distal end of the firing rod, the firing rod and the connecting portion are selectively linked, and the same as the prior art, a screw rod is inserted into the interior of the nail pushing assembly and the nail pushing rod. The connecting portion has a first state and a second state, and a safety device is provided on the connecting portion, and the safety device includes 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 cannot enter the second state from the first 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 at this time, if the operating handle is held, the stapler can be fired.

[0074] Therefore, by adopting the present invention, when the distance between the anvil assembly and the stapler 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 the stapler will not be accidentally fired at this time. 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. During the resetting process after firing, the safety device is in the fourth state, and the connecting portion cannot enter the second state from the first state. Before the preparation for the next operation is completed, the connecting portion is always in the first state, and the stapler cannot be fired again.

[0075] In one embodiment of the present invention, the connecting portion includes two rotating arms arranged opposite to each other, and the two rotating arms include a first end and a second end respectively. In the present invention, the rotating arm can be sleeved on the outside of the screw rod, so that the first end and the second end of the rotating arm are respectively located at the two end portions on the upper and lower sides of the screw rod, and when the first end of the rotating arm moves toward the inside, the second end of the rotating arm moves relatively toward the outside. For example, in each of the drawings of the present invention, the first end of the rotating arm is the top end of the rotating arm, and the second end of the rotating arm is the bottom end of the rotating arm. The distal end of the firing rod is opposite to the second ends of the two rotating arms, and when the connecting portion is in the first state, the first ends of the two rotating arms are retracted, and the second ends of the two rotating arms are opened outwardly, and when the connecting portion is in the second state, the first ends of the two rotating arms are opened outwardly, and the second ends of the two rotating arms are retracted.

[0076] In this embodiment, the safety device includes two safety pins, which are respectively arranged on the inner sides of the first ends of the two rotating arms; when the safety device is in the third state, the ends of the two safety pins approach each other to enter a blocking state, and when the safety device is in the fourth state, the ends of the two safety pins move away from each other to enter a yielding state.

[0077] In this embodiment, the firing mechanism also includes a screw rod, a top block groove is provided on the screw rod, the bottom end of a top block is rotatably fixed to the distal side of the top block groove, and the top block includes a first position area and a second position area; when the top block is in the first position area, the top block does not contact the rotating arm, and the first ends of the two rotating arms are retracted; when the top block is in the second position area, the top end of the top block protrudes from the top block groove and enters between the first ends of the two rotating arms to push the first ends of the two rotating arms outward.

[0078] The working state of the circular tubular stapler of this embodiment is described in four stages below:

[0079] In the initial state where the anvil assembly and the stapler body have just been successfully docked, the top block is located on the proximal side of the first end of the rotating arm and does not contact the rotating arm. The first ends of the two rotating arms are naturally retracted inward when not affected by the top block, and the second ends of the two rotating arms are opened outward, forming a cavity between the second ends of the two rotating arms. When the firing rod moves from the proximal end to the distal end of the stapler, it enters the cavity between the second ends of the two rotating arms. Therefore, the firing rod and the rotating arm are not linked. At this time, even if the operator accidentally presses the handle to push the firing rod, the stapler will not be fired, thereby avoiding accidental firing when the operation is not ready.

[0080] During the surgical preparation process, it is necessary to move the screw rod toward the proximal end of the stapler. When the top block is moved to the second position area, the top end of the top block protrudes from the top block groove, and the safety pin enters a yielding state due to the pressure of the top block. The safety pin will not hinder the relative movement between the top block and the rotating arm. The top block enters between the first ends of the two rotating arms to open the first ends of the two rotating arms outward, that is, the first ends of the two rotating arms are away from each other, and the second ends of the two rotating arms are retracted inward, that is, the second ends of the two rotating arms are close to each other and enter the route of the firing rod moving from the proximal end to the distal end. When the firing rod moves from the proximal end to the distal end of the stapler, it contacts the second end of the rotating arm and then links with the rotating arm. At this time, if the operator presses the handle to push the firing rod, the stapler is fired through the firing rod, the rotating arm and the nail pusher in sequence, thereby realizing the normal function of the stapler.

[0081] When the stapler is fired, the firing rod drives the rotating arm to move toward the distal end of the stapler to fire the stapler. At this time, the rotating arm is separated from the top block, and the top block is located on the proximal side of the rotating arm. The first ends of the two rotating arms are retracted inward again due to the loss of the effect of the top block, and the second ends of the two rotating arms are opened outward so as not to be linked with the firing rod. The safety pin loses the force of the top block and returns to the blocking state.

[0082] When the stapler is reset after being fired, the rotating arm moves toward the proximal end of the stapler and resets, and the safety pin in a blocking state blocks the relative movement of the top end of the top block and the rotating arm, and the top block cannot enter from the proximal side of the first end of the rotating arm to the first end of the rotating arm. The safety pin presses the top end of the top block into the top block groove. At this time, the first end of the rotating arm is not stretched open and is still retracted inward, and the second end of the rotating arm is still opened outward and is not linked to the firing rod. At this time, even if the operator accidentally holds the handle to push the firing rod, the firing rod will enter the cavity at the second end of the rotating arm and the stapler cannot be fired, thereby effectively preventing secondary firing when the fired staple cartridge has not been replaced, thereby improving the safety of the instrument.

[0083] Therefore, the present invention prevents misfiring when the operation is not ready, and effectively prevents secondary firing when the fired nail cartridge is not replaced, while ensuring that the nail pushing assembly can work normally after the operation is prepared, thereby improving the safety of the instrument. The operation preparation here must at least meet the following two conditions: the distance between the nail anvil and the nail cartridge reaches a suitable position and a new nail cartridge that has not been fired is installed in the nail cartridge assembly, so as to ensure the smooth completion of the operation.

[0084] The structure of the stapler of the present invention is described in detail below with reference to the accompanying drawings. Figures 4 to 19 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.

[0085] like Figure 1 and Figure 2 FIG. 1 is a diagram showing the structure of a stapler according to an embodiment of the present invention, wherein in order to more clearly show the internal structure of the stapler, Figure 2 In the figure, one side of the stapler housing is removed, and the stapler assembly is separated from the stapler body. The stapler includes a stapler body and 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 provided at the distal end of the stapler body. The anvil shaft can drive the anvil to move along the axial direction of the anvil shaft, so that the anvil is close to or away from the stapler assembly 12.

[0086] In the present invention, the distal end and the proximal end are relative to the operator. The end closer to the operator is the proximal end, and the end farther from the operator, that is, the end closer to the surgical site is the distal end. That is, in this embodiment, since the operator holds the handle to operate the stapler, Figure 1 and Figure 2In the perspective of the drawing, the end that is biased to the right is the proximal end, and the end that is biased to the left is the distal end. For example, for the push pin assembly, the proximal end of the push pin assembly is the end that is biased to the right relative to the distal end of the push pin assembly, and for example, for the screw rod 6, the proximal end of the screw rod 6 is the end that is biased to the right relative to the distal end of the screw rod 6. The top and bottom in the present invention are relative to the drawing, the direction above the drawing is the top, and the opposite direction is the bottom.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] In this embodiment, when the knob 51 rotates in the first direction, the screw 6 drives the pull tab 52 to move toward the proximal end of the stapler body, and the distal end of the pull tab 52 pulls the first end of the pointer 53 from the third position area to the fourth position area. In practice, the third position area generally refers to the initial position area of ​​the pointer 53. At this time, the distance between the stapler assembly 12 and the anvil assembly 11 is far and has not reached the appropriate position. Therefore, the third position area is also a non-firing area. As the knob 51 rotates in the first direction, the anvil shaft pulls the anvil toward the stapler, so that the distance between the anvil assembly 13 and the stapler assembly 12 reaches the appropriate position. At this time, the pointer 53 is also pulled by the pull tab 52 to the fourth position area. At this time, the operator is allowed to fire the stapler, so the fourth position area is also called the firing area. Therefore, the pointer 53 can be used as an indicator of the position of the anvil shaft to indicate whether the stapler has completed the surgical preparation and is allowed to fire.

[0092] The position indication method of the anvil shaft is only an example and is not intended to be a limitation of the present invention. For example, the position of the anvil shaft may not necessarily be indicated by the pointer 53, but may be indicated by other methods to indicate whether the anvil shaft and the anvil have reached the firing position, or without visual indication.

[0093] However, some careless or inexperienced operators may want to fire the stapler when the pointer 53 is in the third position area. In this case, the distance between the stapler magazine and the anvil assembly 13 has not reached the appropriate position, which may lead to the failure of the operation. 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 fourth position area. The operator may see that the pointer 53 is in the fourth position area and mistakenly believe that the operation is ready. If he fires the stapler again, the operation will also fail.

[0094] 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 nail assembly and the screw rod according to an embodiment of the present invention. Among them, a top block groove 61 is provided on the screw rod 6, and a top block 62 is provided in the top block groove 61. The bottom end 622 of the top block 62 is rotatably fixed to the distal side of the top block groove 61. The push nail assembly is divided into three parts in this embodiment: a push nail rod 2 located at the distal end, a firing rod 4 located at the proximal end, and a rotating arm 3 located between the push nail rod 2 and the firing rod 4. The rotating arm 3 and the firing rod 4 are selectively connected. There are two rotating arms 3, which are arranged opposite to each other and cover the screw rod 6 together. The first end of the rotating arm 3 is respectively provided with a safety pin 33 extending toward the inside. After the rotating arm 3 contacts with the push nail rod 2, they can be linked. When the push nail rod 2 moves toward the distal end of the stapler, it can push the push nail piece to realize the firing of the stapler. The proximal end 42 of the firing rod 4 is opposite to the operating handle 7. When holding the handle 7, the firing rod 4 can be pushed to move toward the distal end of the stapler. If the firing rod 4 is linked with the rotating arm 3 at this time, the firing rod 4 can push the nail pushing rod 2 through the rotating arm 3, thereby achieving the firing of the stapler. It is understandable that in actual applications, the nail pushing rod 2 is not a necessary component, and the rotating arm 3 can also be directly coordinated with the nail pushing piece, which also falls within the protection scope of the present invention. In order to prevent the stapler from being accidentally fired when the nail anvil assembly 13 is not moved to the appropriate position, the present invention further adds a failure protection mode.

[0095] In this embodiment, the second end 32 of the rotating arm 3 is also provided with a driving arm 322 extending toward the proximal end of the stapler. When the second ends of the two rotating arms 3 are retracted, the firing rod 4 contacts the proximal side of the driving arm 322 and then links with the rotating arm 3.

[0096] like Figures 4 to 10 As shown, a schematic diagram of the circular tubular stapler of this embodiment in the initial state is shown, and the circular tubular stapler is in a failure protection mode at this time. In the initial state, the top block 62 is located in the first position area, the top block 62 is located on the proximal side of the first end of the rotating arm 3 and does not contact the rotating arm 3, the safety pin 33 of the rotating arm 3 is in a blocking state without receiving the pressure of the top block 62, the first ends 31 of the two rotating arms 3 are naturally retracted inward when not affected by the top block 62, the second ends 32 of the two rotating arms 3 are opened outward, and a cavity is formed between the second ends 32 of the two rotating arms 3, and the firing rod 4 moves from the proximal end to the distal end of the stapler, and enters the cavity 321 between the second ends 32 of the two rotating arms 3, so the firing rod 4 and the rotating arm 3 are not linked, and at this time, even if the operator accidentally presses the handle 7 to push the firing rod 4, it will not cause the stapler to fire, thereby avoiding misfiring when the operation is not ready. In the present invention, the inside and outside are relative, the direction close to each other is inside, and the opposite direction is outside.

[0097] In this embodiment, the first ends 31 of the two rotating arms 3 are respectively provided with pin holes 314, and the pin holes 314 are provided with compression springs 315, and the safety pin 33 is arranged in the pin holes 314. When the safety pin 33 does not receive external force, the compression spring 315 does not deform, and the safety pin 33 extends out of the first end 31 of the rotating arm 3 and extends toward the opposite side. At this time, the safety pin 33 is in a blocking state. When the top block 62 moves toward the proximal end of the stapler, the top block 62 will press the distal side of the safety pin 33 so that the safety pin 33 enters the pin hole 314, and the compression spring 315 will be compressed and deformed. The safety pin 33 is in a yielding state and does not block the top block 62 from entering between the first ends 31 of the rotating arms 3. After the top block 62 is separated from the rotating arm 3, the restoring deformation force of the compression spring 315 will push the safety pin 33 to extend outward and return to the blocking state. In this embodiment, a first guiding slope 331 is further provided on the distal side of the safety pin 33 . When the top block 62 presses the safety pin 33 from the distal side of the safety pin 33 , the first guiding slope 331 is pressed by the top block so that the safety pin 33 enters the pin hole 314 .

[0098] Here, only one way of switching the safety pin 33 between the yielding state and the blocking state is shown. In another embodiment, the first end of the safety pin 33 is rotatably connected to the inner side of the rotating arm 3, and the first end of the safety pin is provided with a swing reset torsion spring. In the initial state, the safety pin extends toward the rotating arm 3 on the opposite side, and the swing reset torsion spring does not deform. When the top block 62 enters between the first ends 31 of the two rotating arms 3, the safety pin is pushed toward the proximal end of the stapler by the top block 62 and swings toward the proximal end of the rotating arm 3. At this time, the swing reset torsion spring deforms. After the rotating arm 3 is separated from the top block 62, the reset force of the swing reset torsion spring causes the safety pin 33 to swing back and return to the initial state.

[0099] In this embodiment, the bottom end 622 of the top block 62 is provided with a reset structure, and the proximal end of the nail pushing rod is provided with an open cavity 22. When the top block 62 is located in the first position area, the nail pushing rod 2 covers the distal end of the top block groove 61 and presses the top end 621 of the top block 62, so that the top block 621 of the top block 62 rotates toward the proximal end of the top block groove 61. At this time, the top end 621 of the top block 62 is lowered relative to the height of the screw rod 6 and can further fully enter the top block groove 61. When the top block 62 moves from the first position area to the second position area, the top block groove 61 moves toward the proximal end of the stapler relative to the nail pushing rod 2. Since the distal end of the top block groove 61 is separated from the nail pushing rod 2, the top block 62 rotates under the action of the reset structure until the top block 621 of the top block 62 protrudes from the top block groove 61 and first enters the open cavity 22 of the nail pushing rod.

[0100] like Figure 5 and Figure 6As shown, in this embodiment, the bottom end 622 of the top block 62 is pivotally fixed to the distal end of the top block slot 62 by a top pin 64, and the reset structure includes a torsion spring 622 sleeved on the top pin 64. In the initial state, the top block 62 is subjected to the pressure of the nail pushing rod 2, and the torsion spring 622 is rotated and deformed to a certain extent. When the distal end of the top block slot 61 is separated from the nail pushing rod 2, the top block 62 loses the pressure of the nail pushing 2, and under the deformation recovery force of the torsion spring 622, the top block 621 of the top block 62 is pushed to rotate toward the distal end of the top block slot 61 until it protrudes from the top block slot 61 and enters the open cavity 22 of the nail pushing rod, and then with the further movement of the nail anvil shaft 6, the top block 62 enters from the open cavity 22 of the nail pushing rod to between the first ends 31 of the two rotating arms 3. This is only an example of the reset structure. In practical applications, other reset structures can be used, such as other forms of springs, etc., all of which belong to the protection scope of the present invention.

[0101] like Figure 7 As shown, in this embodiment, in order to better guide the top block 62 to enter between the first ends 31 of the rotating arms 3 when the top block 62 moves toward the proximal direction of the anastomosis device relative to the rotating arm 3, the proximal side of the first end 31 of the rotating arm 3 is respectively provided with a second guiding slope 313, when the top block 62 moves from the first position area to the second position area, the second guiding slope 313 of the rotating arm 3 contacts with the top block 62 and guides the top block 62 to enter between the first ends 31 of the two rotating arms 3.

[0102] like Figure 8 As shown, corresponding to the two second guide slopes 313, two third guide slopes 623 corresponding to the two rotating arms 3 are provided on the distal side of the top block 62; when the top block 62 moves from the first position area to the second position area, the third guide slopes 623 of the top block 62 respectively contact the first ends 31 of the two rotating arms 3, and guide the top block 623 to enter between the first ends 623 of the two rotating arms 3.

[0103] In this embodiment, the first ends 31 of the two rotating arms 3 are respectively provided with protrusions 311 facing inwards, and when the first ends 31 of the two rotating arms 3 are folded, the protrusions 311 of the first ends 31 of the two rotating arms 3 are in contact with each other. At the same time, in order to better maintain the connection between the rotating arms 3 and the screw rod 6, the inner surfaces of the rotating arms 3 are respectively formed into arc surfaces that are concave outwards relative to the screw rod 6, and the arc surfaces are adapted to the shape of the outer surface of the screw rod 6.

[0104] like Figures 11 to 14The schematic diagram of the structure of the circular tube type stapler in the present invention after surgical preparation is shown, and the stapler is in a normal firing mode at this time. During surgical preparation, the operator rotates the knob 51 at the proximal end to drive the screw rod 6 to move toward the proximal end of the stapler, thereby driving the top block 62 to disengage from the nail push rod 2, and the top block 62 rotates until the top of the top block 62 protrudes from the top block groove 61. The top block 62 is guided by the third guide slope 623 and the second guide slope 313 to enter between the first ends 31 of the two rotating arms 3, and the first ends 31 of the two rotating arms 3 are spread apart, that is, the first ends 31 of the two rotating arms 3 are separated from each other, and at the same time, the safety pin 31 is pressed into the pin hole 314 through the third guide slope 331, and the safety pin 31 enters the yielding state from the blocking state, and the second ends 32 of the two rotating arms 3 are then retracted inward to reduce or eliminate the cavity between the second ends 32 of the two rotating arms 3, and the second ends 32 of the two rotating arms 3 enter the path of the firing rod 4 moving from the proximal end to the distal end. The proximal end 41 of the firing rod 4 is opposite to the second ends 32 of the two rotating arms 3. When the grip 7 pushes the firing rod 4, the proximal end 41 of the firing rod 4 contacts the second ends 32 of the two rotating arms 3, and the firing rod 41 and the rotating arms 3 are linked to push the rotating arms 3 and the nail pushing rod 2, so as to realize the normal firing of the stapler.

[0105] In this embodiment, a tension spring 312 is further connected between the first ends 31 of the two rotating arms 3. When the top block 62 is not in contact with the rotating arms 3, the first ends 31 of the two rotating arms 3 are retracted inwardly under the action of the tension spring 312, and the tension spring 312 does not deform. When the top block 62 enters between the first ends 31 of the two rotating arms 3, the first ends 31 of the two rotating arms 3 are stretched apart. Fig.11 As shown, the tension spring 312 is stretched and deformed. After the top block 62 is separated from the first ends 31 of the two rotating arms 3, the tension spring 312 pulls the first ends 31 of the two rotating arms 3 back to the folded state.

[0106] In other embodiments, the resetting and holding structure of the rotating arm 3 may not use the tension spring 312. For example, a compression spring may be connected between the second ends 32 of the two rotating arms 3. When the top block 62 is not in contact with the rotating arm 3, under the action of the compression spring, the second ends 32 of the two rotating arms 3 are opened and the first ends 31 of the two rotating arms 3 are retracted, and the compression spring is not deformed at this time. When the top block 62 enters between the first ends 31 of the two rotating arms 3, the first ends 31 of the two rotating arms 3 are stretched apart, and the second ends 32 of the two rotating arms 3 are retracted inwardly, and the compression spring is deformed. After the top block 62 is separated from the first ends 31 of the two rotating arms 3, the deformation recovery force of the compression spring stretches the second ends 32 of the two rotating arms 3 again, so that the first ends 31 of the two rotating arms 3 are pulled back to the retracted state.

[0107] When the pointer 53 is used as the position indicator of the anvil assembly 13 in the stapler, when the pointer 53 is in the third position area, the top block 62 is in the first position area, and the stapler is in the failure protection mode. At this time, even if the handle 7 is held, the stapler will not be fired. When the pointer 53 is pulled by the pull tab 52 and enters the fourth position area, the top block 62 also moves into the second position area with the movement of the screw rod 6, and the stapler is in the normal firing mode. At this time, if the handle 7 is held, the stapler can be fired normally.

[0108] like Figures 14 to 16 As shown in FIG. 1 , it is a schematic diagram of the cooperation between the push pin assembly and the screw rod when the cylindrical stapler of the embodiment is fired. At this time, the stapler returns from the normal firing mode to the failure protection mode. When firing, the firing rod 4 drives the rotating arm 3 to move toward the distal end of the stapler. After the rotating arm 3 moves, the top block 62 comes to the proximal side of the rotating arm 3 (at this time, the screw rod 6 does not move, and the rotating arm 3 moves and changes the positional relationship between the top block 62 and the rotating arm 3). After the top block 62 is completely separated from the rotating arm 3, the first end 31 of the rotating arm 3 will be pulled back to the inner side by the tension spring 312. At this time, the second end 32 of the rotating arm 3 opens outward again to form a cavity 321. Due to the existence of the cavity 321, the firing rod 4 and the rotating arm 3 are not linked. At the same time, due to the loss of the pressure of the top block 62, the safety pin 33 extends out of the pin hole again under the action of the compression spring 315 and returns to the blocking state.

[0109] like Figures 17 to 19 As shown, it is a schematic diagram of the cooperation between the push nail assembly and the screw rod during the resetting process after the firing of the circular tubular stapler of this embodiment. At this time, the stapler is still kept in the failure protection mode to prevent the operator from firing a second time when the surgical preparation is not completed. At this time, the rotating arm 3 is reset toward the proximal end of the stapler, the safety pin 33 is in a blocking state, and there is no guiding slope on the proximal side of the safety pin 33. After it contacts the top block 62, it gives the top block 62 a thrust toward the proximal direction of the stapler, forcing the top 621 of the top block 62 to rotate toward the proximal side of the top block groove 61 until the top 621 of the top block 62 enters the top block groove 61. Since the top 621 of the top block 62 is located in the top block groove 61, it will not contact the protrusion 311 of the first end 31 of the rotating arm 3, and the first end 31 of the rotating arm 3 will not be stretched to both sides. At this time, the rotating arm 3 and the firing rod 4 are still not linked, that is, the stapler is still in the failure protection mode, thereby avoiding the failure of the operation caused by the secondary firing when the nail magazine is not replaced.

[0110] The firing mechanism and stapler provided by the present invention have the following advantages:

[0111] The present invention provides a firing mechanism and a stapler, when the distance between the nail anvil assembly and the nail magazine does not reach a suitable position, the top block on the screw rod does not contact the rotating arm, and the firing rod and the rotating arm do not interact, so that the stapler will not be misfired at this time, and when the nail anvil assembly moves to a suitable position relative to the nail magazine, the top block pushes the first end of the rotating arm outward, and the firing rod and the rotating arm form a linkage, and the stapler can be fired normally at this time, and in the resetting process of the rotating arm after firing, the safety pin can press the top block to enter the top block groove, and the first end of the rotating arm is still kept retracted, the firing rod and the rotating arm cannot be linked, and the stapler cannot be fired again before the next surgical preparation is completed; therefore, the present invention prevents misfire 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 pushing assembly, thereby improving the safety of the instrument.

[0112] 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 in a stapler, comprising a staple pusher assembly, the staple pusher assembly comprising a firing rod and a connecting portion at the distal end of the firing rod, the connecting portion comprising two rotating arms arranged opposite to each other, the distal end of the firing rod being opposite to the second ends of the two rotating arms, the connecting portion having a first state and a second state, a safety device being arranged on the connecting portion, the safety device comprising two safety pins, the two safety pins being arranged at the inner sides of the first ends of the two rotating arms respectively, and the safety device comprising a third state and a fourth state; When the safety device is in the third state, the ends of the two safety pins move away from each other to enter a yielding state, and the connecting portion can enter the second state from the first state; when the safety device is in the fourth state, the ends of the two safety pins move closer to each other to enter a blocking state, and the connecting portion cannot enter the second state from the first state; When the connecting portion is in the first state, the first ends of the two rotating arms are retracted inwardly, the second ends of the two rotating arms are opened outwardly, the firing rod is not linked to the connecting portion, and the stapler cannot be fired; when the connecting portion is in the second state, the first ends of the two rotating arms are opened outwardly, the second ends of the two rotating arms are retracted inwardly, the firing rod is linked to the connecting portion, and the stapler can be fired.

2. The firing mechanism according to claim 1, characterized in that: The firing mechanism further comprises a screw rod, a top block groove is provided on the screw rod, a bottom end of a top block is rotatably fixed to the distal end side of the top block groove, and the top block comprises a first position area and a second position area; When the top block is in the first position area, the top block does not contact the two rotating arms, and the first ends of the two rotating arms are retracted. When the top block is in the second position area, the top end of the top block protrudes from the top block groove and enters between the first ends of the two rotating arms to push the first ends of the two rotating arms outward.

3. The firing mechanism according to claim 2, characterized in that: When the top block moves from the first position area to the second position area, the top end of the top block protrudes from the top block groove, the safety pin enters a yielding state under the pressure of the top block, and the top block enters between the first ends of the two rotating arms; When the stapler is fired, the rotating arm moves toward the distal end of the stapler until it is disengaged from the top block, and the safety pin returns to a blocking state. When the rotating arm is reset toward the proximal end of the stapler, the safety pin presses the top end of the top block into the top block groove.

4. The firing mechanism according to claim 3, characterized in that: A pin hole is provided on the inner side of the first ends of the two rotating arms, a compression spring is provided in the pin hole, and the safety pin is provided in the pin hole. When the top block enters between the first ends of the two rotating arms, the safety pin enters the pin hole under the pressure of the top block. After the rotating arm is separated from the top block, the restoring force of the compression spring causes the safety pin to extend out of the pin hole.

5. The firing mechanism according to claim 4, characterized in that: A first guiding slope is arranged on the distal end side of the safety pin. When the top block enters between the first ends of the two rotating arms, the first guiding slope is pressed by the top block to make the safety pin enter the pin hole.

6. The firing mechanism according to claim 3, characterized in that: The first end of the safety pin is rotatably connected to the inner side of the rotating arm, and the first end of the safety pin is provided with a swing reset structure. In an initial state, the safety pin extends toward the rotating arm on the opposite side. When the top block enters between the first ends of the two rotating arms, the safety pin is pushed by the top block toward the proximal end of the stapler and swings toward the proximal end of the rotating arm. After the rotating arm is separated from the top block, the reset force of the swing reset structure restores the safety pin to its initial state.

7. The firing mechanism according to claim 2, characterized in that: A reset structure is provided on the top block. When the top end of the top block enters the top block groove due to external force, the reset structure is deformed. After the external force is eliminated, the reset force of the reset structure causes the top end of the top block to rotate toward the distal end of the top block groove until it protrudes from the top block groove.

8. The firing mechanism according to claim 7, characterized in that: The nail pushing assembly further comprises a nail pushing rod located at the distal ends of the two rotating arms, and the rotating arms are linked to the nail pushing rod; When the top block is located in the first position area, the proximal end of the nail pushing rod presses the top block so that the top end of the top block deflects toward the proximal end of the top block slot and does not move in conjunction with the rotating arm; When the top block moves from the first position area to the second position area, the top end of the top block gradually breaks away from the pressure of the proximal end of the nail pushing rod, and the top block rotates under the action of the reset structure until the top end of the top block protrudes from the top block groove and enters between the first ends of the two rotating arms.

9. The firing mechanism according to claim 8, characterized in that: An open cavity is provided at the position corresponding to the proximal end of the push rod and the top block groove. When the top block moves from the first position area to the second position area, the top end of the top block protrudes out of the top block groove and enters the open cavity, and further enters between the first ends of the two rotating arms from the open cavity.

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

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

12. The firing mechanism according to claim 2, characterized in that: A tension spring is connected between the first ends of the two rotating arms. When the top block is not in contact with the rotating arm, the first ends of the two rotating arms are retracted inwardly under the action of the tension spring.

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

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

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

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

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