Medical stapler

Abstract

The present invention provides a medical stapler, comprising a stapler body, a stapler pusher rod, a firing handle, an anvil assembly, and a safety mechanism movably arranged in the stapler body, wherein the safety mechanism switches the firing handle and the stapler pusher rod between a first state in which the stapler is not linked and a second state in which the stapler can be linked, and the safety mechanism is provided with: a linkage assembly having a first position region in which the firing handle and the stapler pusher rod are located in the first state and a second position region in the second state; a transmission member, which is arranged between the anvil assembly and the linkage assembly, and during the process in which the anvil assembly moves toward the proximal direction, the anvil assembly acts on the transmission member, and drives the linkage assembly to move from the first position region to the second position region through the transmission member; the doctor can be effectively prevented from firing the staples and the cutter when the anvil assembly is not fully closed, resulting in poor staple forming and even medical accidents.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to a medical stapler. Background Art

[0002] A medical stapler is a medical device that is often used during surgical sutures of the esophagus, intestines and other digestive tracts, as well as physiological tissues such as the foreskin. During the anastomosis, the two sections of tissue are retracted to form an annular anastomosis ring inside the tissue. The medical stapler can discharge the body's bleeding produced during the operation along with the contents, making it easier for the tissue to heal after the operation.

[0003] The existing medical staplers used for treating digestive tract, prepuce hyperplasia, etc. generally include a stapler body, a firing handle rotatably connected to the stapler body, and an anvil assembly disposed at the distal end of the stapler body. The stapler body includes a housing, a staple cartridge assembly disposed at the distal end of the housing and cooperating with the anvil assembly, and a staple push rod disposed in the housing and linked to the firing handle.

[0004] When the anvil assembly is closed in place, the medical stapler reaches a firing state. In the prior art, surgeons generally judge whether the medical stapler reaches the firing state by their own feelings, and fire the stapler and the cutter after the medical stapler reaches the firing state.

[0005] However, on the one hand, the surgeon completely relies on his or her own feeling and experience to judge, which may easily lead to the anvil assembly not being closed properly and causing poor staple formation; on the other hand, some careless or inexperienced doctors may mistakenly fire the staple and the cutter when the anvil assembly is not closed properly, resulting in poor staple formation and even medical accidents.

[0006] In view of this, it is necessary to provide a new medical stapler to solve the above problems. Summary of the invention

[0007] The purpose of the present invention is to provide a medical stapler.

[0008] To achieve the above-mentioned purpose, the present invention adopts the following technical solution: a medical stapler, comprising:

[0009] The stapler body comprises a housing, a stapler-pushing rod movably disposed in the housing, and a firing handle pivotally connected to the housing, wherein the stapler-pushing rod can move along the axial direction of the stapler body;

[0010] an anvil assembly, wherein the anvil assembly can move along the axial direction of the stapler body;

[0011] A safety mechanism movably disposed in the stapler body, the safety mechanism switches the firing handle and the nail pushing rod between a first state in which they are not linked and a second state in which they can be linked, and the safety mechanism is provided with:

[0012] A linkage assembly is movably disposed in the housing and has a first position area for making the firing handle and the nail pushing rod be in a first state and a second position area in a second state;

[0013] The transmission member is arranged between the anvil assembly and the linkage assembly, and when the anvil assembly moves in the proximal direction, the anvil assembly acts on the transmission member and drives the linkage assembly to move from the first position area to the second position area through the transmission member.

[0014] As a further improved technical solution of the present invention, there is a clearance space between the firing handle and the nail pushing rod; when the linkage assembly is located in the second position area, at least part of the structure of the linkage assembly extends into the clearance space, so that the firing handle can act on the nail pushing rod through the linkage assembly.

[0015] As a further improved technical solution of the present invention, the first position area and the second position area are arranged along the transverse direction of the stapler body; the linkage assembly has a base movably connected to the shell along the transverse direction and a linkage member cooperating with the base. During the movement of the anvil assembly in the proximal direction, the anvil assembly acts on the transmission member, and the base is driven to move laterally through the transmission member. The base pushes the linkage member so that at least part of the structure of the linkage member extends into the clearance space.

[0016] As a further improved technical solution of the present invention, the linkage member is movably connected to the base and can move along the axial direction of the stapler body.

[0017] As a further improved technical solution of the present invention, a lateral guide structure is provided between the base and the shell to guide the lateral movement of the base along the stapler body.

[0018] As a further improved technical solution of the present invention, the lateral guiding structure is a sliding groove and a sliding block that cooperate with each other.

[0019] As a further improved technical solution of the present invention, the anvil assembly includes an anvil, an anvil shaft connected to the proximal end of the anvil, and a protrusion arranged on the outer periphery of the anvil shaft, and the protrusion acts on the transmission member to move the transmission member toward the proximal end.

[0020] As a further improved technical solution of the present invention, the transmission member includes a supporting portion sleeved on the anvil shaft, a transmission rod extending from the supporting portion to the proximal end, and the base is arranged at the proximal end of the transmission rod; the protrusion acts on the supporting portion to drive the transmission rod to move toward the proximal end, driving the linkage assembly to move from the first position area to the second position area.

[0021] As a further improved technical solution of the present invention, the stapler body further comprises a stapler magazine assembly disposed at the distal end of the shell, the stapler magazine assembly is provided with a guide groove penetrating along the axial direction; the transmission rod is movably disposed in the guide groove.

[0022] As a further improved technical solution of the present invention, a first guide structure is provided at the distal end of the base, and a second guide structure adapted to the first guide structure is provided at the proximal end of the transmission rod, and the first guide structure cooperates with the second guide structure so that the transmission rod can drive the base to move laterally.

[0023] As a further improved technical solution of the present invention, the first guide structure is a first guide slope, and the distance between the first guide slope and the axis gradually decreases from the proximal end to the distal end; the second guide structure is a second guide slope, and the distance between the second guide slope and the axis gradually decreases from the proximal end to the distal end.

[0024] As a further improved technical solution of the present invention, the safety mechanism further includes a reset mechanism, and the reset mechanism is used to drive the linkage assembly to move from the second position area to the first position area.

[0025] As a further improved technical solution of the present invention, the first position area and the second position area are arranged along the transverse direction of the anastomosis device body; the linkage assembly has a base connected to the shell along the transverse direction and a linkage member movably arranged on the base along the axial direction, and the reset mechanism connects the base and the shell.

[0026] As a further improved technical solution of the present invention, the reset mechanism is an elastic member connecting the linkage assembly and the housing.

[0027] As a further improved technical solution of the present invention, the medical stapler is a circumcision stapler, and the distal end of the anvil assembly is provided with a glans cavity for accommodating the glans.

[0028] The beneficial effect of the present invention is that the medical stapler of the present invention is provided with a safety mechanism, and only when the anvil assembly is closed in place, the safety mechanism will put the firing handle and the staple push rod in the second state that can be linked, which can effectively prevent the doctor from firing the staples and the cutter when the anvil assembly is not closed in place, resulting in poor staple forming and even medical accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic structural diagram of the medical stapler of the present invention.

[0030] Figure 2 yes Figure 1 A schematic structural diagram of the medical stapler shown in FIG.

[0031] Figure 3 yes Figure 2 A cross-sectional view of the medical stapler taken along the AA axis when the anvil assembly is not closed into place.

[0032] Figure 4 yes Figure 3 Magnified view of point B in FIG.

[0033] Figure 5 yes Figure 4 Schematic diagram of the structure of insurance institutions.

[0034] Figure 6 yes Figure 1 The schematic diagram of the structure of the medical stapler after removing the shell is shown.

[0035] Figure 7 yes Figure 1 The schematic diagram of the structure of the stapler pusher rod in the medical stapler is shown.

[0036] Figure 8 yes Figure 2 A cross-sectional view of the medical stapler taken along the AA direction after the anvil assembly is closed in place and the handle is grasped.

[0037] Fig. 9 yes Figure 2 A cross-sectional view of the medical stapler taken along the AA axis after the anvil assembly is closed into place.

[0038] Fig.10 yes Figure 2 A cross-sectional view of the medical stapler taken along the AA direction after the anvil assembly is closed in place and the handle is grasped. DETAILED DESCRIPTION

[0039] The present invention will be described in detail below in conjunction with the various embodiments shown in the accompanying drawings. Figures 1 to 10It is shown as a preferred embodiment of the present invention. However, it should be noted that these embodiments are not limitations of the present invention, and any equivalent transformation or replacement of functions, methods, or structures made by ordinary technicians in the field according to these embodiments shall fall within the protection scope of the present invention.

[0040] The words expressing position and direction described in the present invention are all based on the instrument operator as a reference, the end close to the instrument operator is the proximal end, and the end away from the instrument operator is the distal end; the axial direction in the present invention refers to the length direction of the component, and the transverse direction refers to the direction perpendicular to the axial direction. In addition, the terms first, second, etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0041] Please refer to Figures 1 to 10 As shown, the present invention provides a medical stapler 100, which is used to apply a plurality of staples to physiological tissues of a human body and cut the corresponding physiological tissues at the same time.

[0042] The medical stapler 100 in the embodiment of the present invention is a circular tube stapler, and a circumcision stapler used for circumcision surgery is used as an example for specific description, so as to apply multiple staples to the physiological tissue of the human body (here, foreskin) and cut the corresponding physiological tissue at the same time. However, it should be noted that the technical spirit involved in the following embodiments can be replaced and applied to other forms of staplers, such as a circular tube stapler with double handles.

[0043] The circumcision stapler 100 comprises a stapler body 1 , an anvil assembly 2 axially movably connected to the stapler body 1 , and a safety mechanism 3 movably disposed in the stapler body 1 .

[0044] The stapler body 1 includes a shell 11, a nail pushing rod 12 movably disposed in the shell 11, a firing handle 13 pivotally connected to the shell 11, a nail magazine assembly 14 disposed at the distal end of the shell 11, and a knob 15 disposed at the proximal end of the shell 11 to drive the anvil assembly 2 to move axially along the stapler body 1. The nail pushing rod 12 can move axially along the stapler body 1.

[0045] Preferably, the housing 11 is formed by splicing two sub-housings.

[0046] In this embodiment, the firing handle 13 includes a rotating portion 131 pivotally connected to the housing 11, a second connecting portion 132 for driving the nail pushing rod 12, and an operating portion 133 for medical personnel to operate. When the firing handle 13 rotates, the second connecting portion 132 directly or indirectly abuts against the nail pushing rod 12 to drive the nail pushing rod 12 to move in the distal direction, thereby achieving the firing of the circumcision stapler 100. It is understandable that the linkage between the firing handle 13 and the nail pushing rod 12 is not limited to this.

[0047] Furthermore, the firing handle 13 and the nail pushing rod 12 have a first state of non-coupling and a second state of cooperating. It is understandable that, in the embodiment in which the nail pushing rod 12 is pushed by the second connecting portion 132 to perform a firing motion, the first state of non-coupling between the firing handle 13 and the nail pushing rod 12 means that during the process of holding the firing handle 13 to rotate the firing handle 13, the second connecting portion 132 cannot directly or indirectly act on the nail pushing rod 12, so that the nail pushing rod 12 cannot perform a firing motion; correspondingly, the second state of cooperating means that during the process of holding the firing handle 13 to rotate the firing handle 13, the second connecting portion 132 will directly or indirectly act on the nail pushing rod 12, so that the nail pushing rod 12 can perform a firing motion.

[0048] In a specific embodiment, a first connecting portion 121 is provided on the nail pushing rod 12, and a clearance space is provided between the firing handle 13 and the nail pushing rod 12, that is, the firing handle 13 and the nail pushing rod 12 are arranged at an axial interval along the anastomosis body 1. It can be understood that the clearance space is located between the first connecting portion 121 and the second connecting portion 132.

[0049] Please refer to Figure 8 As shown, when the anvil assembly 2 is not closed in place, when the firing handle 13 is held and rotated, the second connecting portion 132 moves in the clearance space and is unable to directly or indirectly resist and act on the nail pushing rod 12, so that the nail pushing rod 12 cannot perform the firing movement. It can be understood that, at this time, the firing handle 13 and the nail pushing rod 12 are in the first state.

[0050] Moreover, in the present embodiment, the first connecting portion 121 is disposed at the proximal end of the nail pushing rod 12. Of course, this is not limited to the above. The first connecting portion 121 can be disposed at any axial position of the nail pushing rod 12. As long as the firing handle 13 and the nail pushing rod 12 are in the second state, the firing handle 3 can be rotated to drive the nail pushing rod 12 to move toward the distal end by acting on the first connecting portion 121.

[0051] Furthermore, a first return spring 16 is sleeved on the nail pushing rod 12, and in the second state between the firing handle 13 and the nail pushing rod 12, the first return spring 16 is gradually compressed during the process of holding the firing handle 13 and driving the nail pushing rod 12 to move toward the distal direction. When the holding force applied to the firing handle 13 is canceled, the nail pushing rod 12 is driven by the biasing force of the first return spring 16 to return to the initial position toward the proximal end.

[0052] Specifically, a convex portion can be provided on the nail pushing rod 12, and the proximal end of the first return spring 16 abuts against the convex portion, and the distal end of the first return spring 16 abuts against the nail tube of the nail magazine assembly 14. Of course, this is not limited to the above. The distal end of the first return spring 16 can also abut against the shell 11, as long as the distal end of the first return spring 16 can be limited.

[0053] Preferably, the convex portion is a part of the first connecting portion 121 to simplify the structure of the nail pushing rod 12. In this case, in an embodiment where the first connecting portion 121 (convex portion) is disposed at the proximal end of the nail pushing rod 12, the nail pushing rod 12 is T-shaped from the proximal end to the distal end. Of course, this is not limited thereto.

[0054] Furthermore, a second resetting elastic member 17 is provided between the firing handle 13 and the shell 11. When the firing handle 13 is held and rotated, the second resetting elastic member 17 is gradually compressed. When the holding force applied to the firing handle 13 is cancelled, the firing handle 13 is reset to its initial position under the action of the biasing force of the second resetting elastic member 17.

[0055] In a specific implementation, the second resetting elastic member 17 is a spring. Of course, the present invention is not limited thereto. The second resetting elastic member 17 may also be an elastic block.

[0056] In this embodiment, two firing handles 13 are symmetrically disposed on two opposite sides of the housing 11 , but the present invention is not limited thereto, and only one firing handle 13 may be disposed.

[0057] Please refer to Figure 3 As shown, the nail magazine assembly 14 includes a nail barrel 141 disposed at the distal end of the housing 11, a nail pushing piece 142 disposed in the nail barrel 141, a cutter disposed on the nail pushing piece 142, and a nail magazine 143 disposed at the distal end of the nail barrel 141. The structures of the various components in the nail magazine assembly 14 and the coordination relationship between them are all existing in the art, and are not described in detail here.

[0058] The proximal end of the nail pushing piece 142 is connected to the distal end of the nail pushing rod 12 , so that the nail pushing rod 12 can drive the nail pushing piece 142 to move synchronously.

[0059] The anvil assembly 2 includes an anvil 21 that cooperates with the stapler assembly 14 and an anvil shaft 22 connected to the proximal end of the anvil 21. The anvil shaft 22 is inserted into the stapler body 1, and the proximal end of the anvil shaft 22 is threadedly connected to the knob 15. By rotating the knob 15, the anvil assembly 2 is driven to move axially along the stapler body 1 so that the anvil 21 moves toward or away from the stapler assembly 14. When the anvil assembly 2 is closed in place, the anvil 21 and the stapler 143 clamp the physiological tissue to facilitate subsequent anastomosis cutting and improve the anastomosis effect.

[0060] In a specific embodiment, the anvil shaft 22 includes an anvil shaft body 221 and a screw rod 222 which are arranged in sections, wherein the anvil shaft body 221 is fixedly connected to the anvil seat 21, and the screw rod 222 connects the anvil shaft body 221 and the knob 15. Of course, this is not limited to the above, and the anvil shaft body 221 and the screw rod 222 can also be arranged in one piece.

[0061] It can be understood that in the embodiment where the medical stapler is a circumcision stapler, the distal end of the anvil assembly 2 is further provided with a glans cavity for accommodating the glans.

[0062] Please refer to Figure 3-Figure 10 As shown, the safety mechanism 3 is movably disposed in the stapler body 1, and the safety mechanism 3 can switch the firing handle 13 and the nail pushing rod 12 between the first state and the second state.

[0063] For further information, see Figure 4-Figure 5 As shown, the safety mechanism 3 includes a linkage assembly 31 movably arranged in the shell 11, and a transmission member 32 axially arranged between the anvil assembly 2 and the linkage assembly 31. During the movement of the anvil assembly 2 in the proximal direction, the anvil assembly 2 acts on the transmission member 32 and drives the linkage assembly 31 to move through the transmission member 32.

[0064] The linkage assembly 31 can move between a first position area in which the firing handle 13 and the nail pushing rod 12 are located in a first state and a second position area in a second state. It can be understood that, for the implementation scheme in which the make way space is set, when the linkage assembly 31 is located in the first position area, the linkage assembly 31 is away from the make way space, so that the firing handle 13 is in an empty firing state, that is, when the firing handle 13 is rotated, the second connecting portion 132 of the firing handle 13 is always unable to directly or indirectly act on the nail pushing rod 12, thereby failing to fire the stapler. At this time, the firing handle 13 and the nail pushing rod 12 are in the first state; when the linkage assembly 31 is located in the second position area, at least part of the structure of the linkage assembly 31 extends into the make way space, so that the firing handle 13 can indirectly act on the nail pushing rod 12 through the linkage assembly 31. At this time, the firing handle 13 and the nail pushing rod 12 are in the second state, and the nail pushing rod 12 can be driven to move toward the distal direction to fire the stapler by rotating the firing handle 13.

[0065] Further, the first position area and the second position area are arranged along the transverse direction of the stapler body 1, and in this embodiment, the second position area is defined as being closer to the axis of the stapler body 1 than the first position area, that is, the second position area is closer to the stapler push rod 12 than the first position area. Of course, this is not limited to this.

[0066] Specifically, the linkage assembly 31 has a base 311 movably connected to the shell 11 and a linkage member 312 cooperating with the base 311. The base 311 can move laterally. During the movement of the anvil assembly 2 in the proximal direction, the anvil assembly 2 acts on the transmission member 32 to drive the base 311 to move laterally. The base 311 pushes the linkage member 312 so that at least part of the structure of the linkage member 312 extends into the clearance space, so that the firing handle 13 and the nail pushing rod 12 are switched to the second state to facilitate subsequent firing.

[0067] Ginseng Figure 4-Figure 5 In the illustrated embodiment, the linkage member 312 is movably connected to the base 311, and the linkage member 312 can move along the axial direction of the stapler body 1. When the linkage assembly 31 is located in the second position area, at least part of the linkage member 312 extends into the clearance space to connect the first connection portion 121 and the second connection portion 132. Holding the firing handle 13, the firing handle 13 pushes the linkage member 312 to move in the distal direction, and the linkage member 312 drives the staple pusher rod 12 to move in the distal direction to fire the staples and the cutter.

[0068] Of course, this is not limited to the above, the linkage member 312 may also be movably connected to the nail pushing rod 12, it is understandable that the linkage member 312 only needs to be configured to be able to move laterally between the first position area and the second position area, and to be able to move in the distal direction synchronously with the nail pushing rod 12.

[0069] Furthermore, the stapler body 1 also has a guide channel 18 arranged between the first connecting portion 121 and the second connecting portion 132, and the guide channel 18 is located in the make way space. When the linkage assembly 31 moves between the first position area and the second position area, the guide channel 18 guides the linkage member 312 to move horizontally along the stapler body 1, and limits the position of the linkage member 312 so that the linkage member 312 is located between the first connecting portion 121 and the second connecting portion 132. Therefore, when the linkage assembly 31 is located in the second position area, the firing handle 13 and the nail pushing rod 12 are in the second state; when the linkage assembly 31 is located in the second position area, the guide channel 18 accommodates at least a portion of the linkage member 312, and in the process of rotating the firing handle 13, the guide channel 18 can limit the shaking of the linkage member 312, so that the firing movement is more stable.

[0070] It is understandable that when the linkage assembly 31 is located in the first position area, the linkage member 312 is located outside the guide channel 18, so that the first connecting portion 121 and the second connecting portion 132 are spaced apart, and the firing handle 13 and the nail pushing rod 12 are in the first state.

[0071] At Figure 7 In the specific embodiment shown, the first connecting portion 121 has extension walls 122 located on two opposite sides of the axial direction, the extension walls 122 protrude toward the second connecting portion 132 along the circumferential direction, and the guide channel 18 is formed between the extension walls 122. Of course, this is not limited thereto.

[0072] Furthermore, a transverse guide structure 4 is provided between the base 311 and the shell 11 to guide the transverse movement of the base 311 along the stapler body 1, so that the transmission member 32 can drive the linkage assembly 31 to move transversely between the first position area and the second position area.

[0073] Furthermore, two symmetrically arranged transverse guide mechanisms 4 are provided between the base 311 and the shell 11 to further enhance the stability of the base 311 in transverse movement. Of course, this is not limited to this, and the transverse guide mechanism 4 can also be provided on only one side of the base 311.

[0074] In this embodiment, the transverse guide structure 4 is a slide groove 41 and a slider 42 that cooperate with each other, and the slide groove 41 extends in the transverse direction of the stapler body 1 to connect the base 311 to the housing 11 in a slidable manner in the transverse direction. Of course, this is not limited to this, and it can be understood that the transverse guide structure 4 only needs to be configured to connect the base 311 to the housing 11 in a slidable manner in the transverse direction.

[0075] In a specific embodiment, the slider 42 is disposed on the base 311, and the slide groove 41 is disposed on the housing 11. Of course, this is not limited to this, for example, the slider 42 can also be disposed on the housing 11, and in this case, the slide groove 41 is disposed on the base 311.

[0076] It is understandable that in the embodiment with two firing handles 13, the circumcision stapler 100 has two safety mechanisms 3 respectively matched with the firing handles 13, the two safety mechanisms 3 are respectively arranged on opposite sides of the nail pushing rod 12, and the two safety mechanisms 3 are integrally arranged to enhance the effect of the safety mechanisms 3. Of course, this is not limited to this, for example, the specific number of the safety mechanisms 3 is not limited to the above two, and can be set according to specific circumstances; or the two safety mechanisms 3 can be set separately.

[0077] The transmission member 32 is movably arranged in the stapler body 1. When the anvil assembly 2 moves toward the proximal direction, the anvil assembly 2 acts on the transmission member 32 to drive the transmission member 32 to move toward the proximal direction. The transmission member 32 drives the linkage assembly 31 to move from the first position area to the second position area, converting the axial movement of the transmission member 32 into the lateral movement of the linkage assembly 31. When the anvil assembly 2 is closed in place, at least part of the linkage member 312 extends into the guide channel 18 to realize the anvil assembly 2. The firing handle 13 and the nail pushing rod 12 are linked, so that only when the anvil assembly 2 is closed in place, the firing handle 13 and the nail pushing rod 12 are in the second state, that is, the firing handle 13 and the nail pushing rod 12 can be linked. At this time, the circumcision stapler 100 is in a fireable state, which can effectively prevent the doctor from holding the firing handle 13 when the anvil assembly 2 is not closed in place, and firing the staples and the cutter, resulting in poor staple forming and even causing medical accidents.

[0078] The above-mentioned firing state means that the anvil assembly 2 is closed in place, so that the nail magazine assembly 14 and the anvil 21 have clamped the foreskin to be cut in place, and the firing handle 13 and the nail pushing rod 12 are also in the second state that can be linked.

[0079] Specifically, in the axial direction, the transmission member 32 is located between the anvil assembly 2 and the base 311. When the anvil assembly 2 moves in the proximal direction, the anvil assembly 2 acts on the transmission member 32, and the base 311 is driven to move laterally toward the second position area through the transmission member 32, so as to drive the linkage member 312 to extend into the guide channel 18.

[0080] Furthermore, the anvil assembly 2 also includes a protrusion 23 arranged on the outer periphery of the anvil shaft 22, and the transmission member 32 is arranged at the proximal end of the protrusion 23. When the anvil assembly 2 moves toward the proximal end, the protrusion 23 abuts against the transmission member 32 to drive the transmission member 32 to move toward the proximal end.

[0081] In a specific embodiment, the transmission member 32 is sleeved on the anvil shaft 22, and the protrusion 23 is annular to resist the transmission member 32. However, this is not limited to the embodiment, and the protrusion 23 may not be annular. It is understandable that the protrusion 23 only needs to be able to resist the transmission member 32.

[0082] In the embodiment where the anvil shaft 22 has an anvil shaft body 221 and a screw rod 222 that are arranged in sections, the protrusion 23 can be arranged on the outer periphery of the anvil shaft body 221 or on the outer periphery of the screw rod 222 .

[0083] It can be understood that the outer diameter of the anvil shaft body 221 is generally larger than the outer diameter of the screw rod 222, so that in the embodiment where the protrusion 23 is arranged on the outer periphery of the anvil shaft body 221, the protrusion 23 can be used as a part of the anvil shaft body 221. For example, the protrusion 23 is the proximal end of the anvil shaft body 221. During the movement of the anvil assembly 2 in the proximal direction, the proximal end of the anvil shaft body 221 abuts against the transmission member 32, pushing the transmission member 32 and the anvil assembly 2 to move in the proximal direction synchronously, so as to drive the linkage assembly 31 to move from the first position area to the second position area. Of course, this is not limited to the above, and the protrusion 23 can also be arranged at other axial positions of the anvil shaft body 221, as long as the protrusion 23 can drive the transmission member 32 to move in the proximal direction synchronously when the anvil assembly 2 moves in the proximal direction.

[0084] Specifically, the transmission member 32 includes a supporting portion 321 sleeved on the anvil shaft 22 and a transmission rod 322 extending from the supporting portion 321 toward the proximal end, and the supporting portion 321 is in abutment with the protrusion 23. When the anvil assembly 2 moves toward the proximal end, the protrusion 23 abuts against the supporting portion 321, driving the transmission rod 322 to move toward the proximal end, thereby driving the linkage assembly 31 to move from the first position area to the second position area.

[0085] Furthermore, the nail magazine assembly 14 is provided with a guide groove 144 which is axially penetrated, and the transmission rod 322 enters the shell 11 from the inner side of the nail magazine assembly 14 through the guide groove 144 and cooperates with the base 311, that is, the proximal end of the transmission rod 322 is abutted and cooperated with the base 311.

[0086] In the present invention, the inner side of the nail magazine assembly 14 refers to the side of the nail magazine assembly 14 close to the axis of the nail magazine assembly 14, more specifically, the side of the nail pushing piece 142 close to its axis. It can be understood that the guide groove 144 penetrates the nail barrel 141 and the nail pushing piece 142 at the same time, so that the transmission rod 322 can pass through the guide groove 144 and pass through the inner side of the nail magazine assembly 14 into the housing 11.

[0087] During the axial movement of the transmission member 32 along the medical stapler 100 , the transmission rod 322 moves along the guide groove 144 to guide and limit the movement of the transmission member 32 .

[0088] Furthermore, an axial guide structure is provided between the transmission member 32 and the stapler body 1 to guide the transmission member 32 to move along the axial direction of the stapler body.

[0089] In this embodiment, the axial guide structure is a through slot 3221 and a guide block 1411 that cooperate with each other. When the transmission member 32 moves axially, the through slot 3221 moves along the guide block 1411 to guide and limit the movement of the transmission member 32.

[0090] In a specific embodiment, the through slot 3221 is provided on the transmission rod 322 and extends in the axial direction, and the guide block 1411 is provided on the nail barrel 141 and is located in the guide slot 144, that is, the guide block 1411 divides the guide slot 144 into two independent guide slots for the transmission rod 322 to pass through. Of course, it is not limited to this, and it can be understood that the guide block 1411 can also be provided on the housing 11, as long as it can cooperate with the through slot 3221 for guidance.

[0091] Furthermore, the abutting portion 321 is detachably connected to the transmission rod 322, so as to facilitate the assembly of the transmission member 32 into the stapler body 1. Of course, it is not limited thereto, and the transmission rod 322 may also be fixedly connected to the abutting portion 321.

[0092] In the embodiment where the circumcision stapler 100 has two safety mechanisms 3, the two transmission members 32 share one abutting portion 321, the abutting portion 321 is sleeved on the anvil shaft 22, and the two transmission rods 322 are connected to opposite ends of the abutting portion 321. When the anvil assembly 2 moves in the proximal direction, the anvil assembly 2 acts on the abutting portion 321 to drive the two transmission rods 322 to move in the proximal direction synchronously, and synchronously drive the corresponding linkage assembly 31 to move to the second position area. Of course, it is not limited to this, as long as the two transmission members 32 can be driven to move in the proximal direction synchronously through the driving of the anvil assembly 2.

[0093] Furthermore, the linkage assembly 31 is provided with a first guide structure 313, and the transmission member 32 is provided with a second guide structure 323 adapted to the first guide structure 313. When the transmission member 32 moves toward the proximal end, the first guide structure 313 cooperates with the second guide structure 323 to make the linkage assembly 31 move laterally toward the second position area. Of course, it is not limited to this, and the guide structure can also be provided only on the linkage assembly 31 or the transmission member 32, as long as it can guide the relative movement between the transmission member 32 and the linkage assembly 31.

[0094] It can be understood that when the linkage assembly 31 moves laterally to the first position, the first guide structure 313 cooperates with the second guide structure 323 to drive the transmission member 32 to move axially toward the distal direction.

[0095] It is understandable that, in this embodiment, the first guide structure 313 is disposed at the distal end of the base 311, and the second guide structure is disposed at the proximal end of the transmission rod 322. Of course, this is not limited thereto.

[0096] Please refer to Figure 5 In the embodiment shown, the first guide structure 313 is a first guide slope, and the second guide structure 323 is a second guide slope, that is, the base 311 and the transmission rod 322 are matched with guide slopes, which has a simple structure and stable matching. Of course, this is not limited to this.

[0097] Specifically, the distances between the first guide slope and the second guide slope and the axis center gradually decrease from the proximal end to the distal end. When the transmission member 32 moves toward the proximal end, it can drive the linkage assembly 31 to move from the first position area to the second position area closer to the axis center.

[0098] Furthermore, the nail magazine assembly 14 also includes a limiting cylinder 145 arranged in the nail tube 141. When the anvil assembly 2 moves along the axial direction of the stapler body 1, the anvil assembly 2 moves along the limiting cylinder 145, which can guide the movement of the anvil assembly 2 to prevent the anvil assembly 2 from shaking during the movement.

[0099] The transmission member 32 is located at the proximal end of the limiting cylinder 145. In an embodiment in which the anvil shaft 22 has a segmented anvil shaft body 221 and a screw rod 222, during the movement of the anvil assembly 2 in the proximal direction, the proximal end of the anvil shaft body 221 penetrates from the proximal end of the limiting cylinder 145 and acts on the transmission member 32, pushing the transmission member 32 to move synchronously with the anvil assembly 2 in the proximal direction, so as to drive the linkage assembly 31 to move from the first position area to the second position area.

[0100] Furthermore, a first matching portion 223 is provided on the anvil shaft body 221, and a second matching portion 1451 is provided on the limiting cylinder 145. When the anvil assembly 2 is closed in place, the first matching portion 223 cooperates with the second matching portion 1451 to limit the anvil assembly 2 from continuing to move in the proximal direction to prevent the closure from being too tight, thereby preventing the foreskin tissue from being excessively squeezed.

[0101] In this embodiment, the first matching portion 223 is a step portion arranged at the distal end of the anvil shaft body 221, and the second matching portion 1451 is the distal end surface of the limiting cylinder 145. When the anvil assembly 2 is closed in place, the proximal end surface of the step portion abuts against the distal end surface of the limiting cylinder 145 to limit the anvil assembly 2 from continuing to move in the proximal direction, preventing the closure from being too tight, so as to prevent the foreskin tissue from being excessively squeezed.

[0102] Of course, it is not limited to this. For example, the second matching portion 1451 can also be arranged at the proximal end of the limiting cylinder 145 and protrude toward the center line of the limiting cylinder 145. It can be understood that the first matching portion 223 and the second matching portion 1451 only need to be configured to limit the anvil assembly 2 from continuing to move in the proximal direction when the anvil assembly 2 is closed in place.

[0103] Furthermore, the safety mechanism 3 also includes a reset mechanism 33. When the anvil assembly 2 moves toward the distal direction, the reset mechanism 33 drives the linkage assembly 31 to move from the second position area to the first position area, so that the firing handle 13 and the nail push rod 12 are switched to the first state to prevent accidental firing.

[0104] In the embodiment where the linkage member 312 is movably connected to the base 311, the reset mechanism 33 is located between the housing and the base 311, so as to drive the base 311 to move laterally toward the first position area, thereby driving the linkage member 312 to move synchronously in the direction away from the guide channel 18. However, it is not limited thereto, and it can be understood that when the linkage member 312 is connected to the nail pushing rod 12, the reset mechanism 33 can be arranged between the linkage member 312 and the nail pushing rod 12, so that when the base 311 cancels the force applied to the linkage member 312, the reset mechanism 33 can drive the linkage member 312 away from the guide channel 18, so that the firing handle 13 and the nail pushing rod 12 are switched to the first state, thereby preventing accidental firing.

[0105] In this embodiment, the reset mechanism 33 is an elastic member connecting the base 311 and the shell 11, preferably, a tension spring. Of course, this is not limited to this. The reset mechanism 33 can also be an elastic block or other structure, as long as it can drive the linkage assembly 31 to move from the second position area to the first position area.

[0106] During the movement of the linkage assembly 31 from the first position area to the second position area, the tension spring is gradually stretched, so that when the anvil assembly 2 moves in the distal direction, the transmission member 32 cancels the pressure applied to the linkage assembly 31, and driven by the biasing force of the tension spring, the linkage assembly 31 moves from the second position area to the first position area, and at the same time, the linkage assembly 31 drives the transmission member 32 to move in the distal direction.

[0107] Furthermore, the safety mechanism 3 also includes a limiting structure 35 arranged in the stapler body 1. When the linkage assembly 31 is located in the first position area, the limiting structure 35 is used to limit the distal movement of the transmission member 32 to enhance the stability of the transmission member 32, so that the transmission member 32 can act on the linkage assembly 31 when it moves proximally.

[0108] Specifically, the limiting structure 35 includes a first abutting surface provided at the distal end of the housing 11 , and when the linkage assembly 31 is located in the first position area, the transmission rod 322 abuts against the first abutting surface to limit the transmission member 32 from moving toward the distal end.

[0109] In a specific embodiment, the transmission rod 322 is provided with a second abutting surface 3222 which is parallel to and opposite to the first abutting surface. When the linkage assembly 31 is located in the first position area, the second abutting surface 3222 abuts against and fits with the first abutting surface, thereby limiting the distal movement of the transmission member 32 and enhancing the stability of the transmission member 32.

[0110] Furthermore, the limiting mechanism 35 also includes a receiving portion 351 provided at the proximal end of the nail tube 145. When the linkage assembly 31 is located in the first position area, at least part of the structure of the abutting portion 321 is received in the receiving portion 351, and the abutting portion 321 abuts against the proximal end of the nail tube 145, thereby limiting the distal movement of the transmission member 32 and also limiting the rotation of the transmission member 32.

[0111] Furthermore, the safety mechanism 3 is provided with a marking portion 34, and the shell 11 is provided with an observation port 111 for exposing the marking portion 35 to observe the position of the safety mechanism 3, so that medical staff can intuitively identify the position of the safety mechanism 3 through the observation port 111, thereby determining whether the anvil assembly 2 is closed in place.

[0112] In this embodiment, the marking portion 34 includes a first marking portion 341 arranged at intervals and a second marking portion 342 different from the first marking portion 341. When the linkage assembly 31 is located in the first position area, the first marking portion 341 is exposed from the observation port 111; when the linkage assembly 31 is located in the second position area, the second marking portion 342 is exposed from the observation port 111, so that medical staff can intuitively identify the position of the safety mechanism 3 through the observation port 111, thereby determining whether the anvil assembly 2 is closed in place.

[0113] In this embodiment, the marking portion 34 is provided on the base 311, and the first marking portion 341 and the second marking portion 342 are provided on the base 311 at intervals along the lateral direction, so that when the base 311 moves laterally, the first marking portion 341 or the second marking portion 342 can be exposed from the observation port 111. Of course, this is not limited to this, for example, the marking portion 34 can also be provided on the transmission rod 322, and in this case, the first marking portion 341 and the second marking portion 342 are provided on the transmission rod 322 at intervals along the axial direction, so that when the transmission rod 322 moves axially, the first marking portion 341 or the second marking portion 342 can be exposed from the observation port 111.

[0114] In a specific embodiment, the first marking portion 341 is red and the second marking portion 342 is green; of course, it is not limited to this, and the first marking portion 341 and the second marking portion 342 can also be distinguished by other colors or other methods, such as patterns.

[0115] Further, when the slider 42 is disposed on the base 311 and the marking portion 34 is disposed on the base 311 , the first marking portion 341 and the second marking portion 342 may be disposed on the slider 42 to simplify the structure of the base 311 .

[0116] Compared with the prior art, the medical stapler 100 of the present invention is provided with a safety mechanism 3. Only when the anvil assembly 2 is closed in place, the safety mechanism 3 will put the firing handle 13 and the staple push rod 12 in the second state in which they can be linked. This can effectively prevent the doctor from firing the staples and the cutter when the anvil assembly 2 is not closed in place, resulting in poor staple formation and even medical accidents.

[0117] It should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0118] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A medical stapler, comprising: The stapler body comprises a housing, a stapler-pushing rod movably disposed in the housing, and a firing handle pivotally connected to the housing, wherein the stapler-pushing rod can move along the axial direction of the stapler body; an anvil assembly, wherein the anvil assembly can move along the axial direction of the stapler body; The invention is characterized in that there is a space between the firing handle and the nail pushing rod; The medical stapler further comprises a safety mechanism movably arranged in the stapler body, the safety mechanism switches the firing handle and the nail pushing rod between a first state of non-coupling and a second state of cooperating, and the safety mechanism comprises: A linkage assembly is movably disposed in the shell and has a first position area where the firing handle and the nail pushing rod are located in a first state and a second position area in a second state, wherein the first position area and the second position area are arranged along the transverse direction of the stapler body; the linkage assembly comprises a base movably connected to the shell along the transverse direction and a linkage member matched with the base, and when the linkage assembly is located in the second position area, at least a part of the structure of the linkage member extends into the clearance space, so that the firing handle can act on the nail pushing rod through the linkage member; A transmission member is disposed between the anvil assembly and the linkage assembly, and when the anvil assembly moves in the proximal direction, the anvil assembly acts on the transmission member, and the base is driven to move laterally through the transmission member, and the base pushes the linkage member, so that at least part of the structure of the linkage member extends into the clearance space.

2. The medical stapler according to claim 1, characterized in that: The linkage member is movably connected to the base and can move along the axial direction of the stapler body.

3. The medical stapler according to claim 1, characterized in that: A lateral guide structure is provided between the base and the shell to guide the lateral movement of the base along the stapler body.

4. The medical stapler according to claim 3, characterized in that: The transverse guiding structure is a sliding groove and a sliding block that cooperate with each other.

5. The medical stapler according to claim 1, characterized in that: The anvil assembly comprises an anvil, an anvil shaft connected to the proximal end of the anvil, and a protrusion arranged on the outer periphery of the anvil shaft, wherein the protrusion acts on the transmission member to make the transmission member move toward the proximal end.

6. The medical stapler according to claim 5, characterized in that: The transmission member includes a supporting portion sleeved on the anvil shaft, a transmission rod extending from the supporting portion to the proximal end, and the base is arranged at the proximal end of the transmission rod; the protrusion acts on the supporting portion to drive the transmission rod to move toward the proximal end, driving the linkage assembly to move from the first position area to the second position area.

7. The medical stapler according to claim 6, characterized in that: The stapler body further comprises a stapler cartridge assembly disposed at the distal end of the shell, the stapler cartridge assembly being provided with a guide groove penetrating along the axial direction; the transmission rod is movably disposed in the guide groove.

8. The medical stapler according to claim 6, characterized in that: The distal end of the base is provided with a first guide structure, the proximal end of the transmission rod is provided with a second guide structure adapted to the first guide structure, and the first guide structure cooperates with the second guide structure so that the transmission rod can drive the base to move laterally.

9. The medical stapler according to claim 8, characterized in that: The first guiding structure is a first guiding slope, and the distance between the first guiding slope and the axis gradually decreases from the proximal end to the distal end; the second guiding structure is a second guiding slope, and the distance between the second guiding slope and the axis gradually decreases from the proximal end to the distal end.

10. The medical stapler according to claim 1, characterized in that: The safety mechanism further comprises a reset mechanism, and the reset mechanism is used to drive the linkage assembly to move from the second position area to the first position area.

11. The medical stapler according to claim 10, characterized in that: The first position area and the second position area are arranged along the transverse direction of the stapler body; the linkage assembly has a base movably connected to the shell along the transverse direction, and a linkage member movably arranged on the base along the axial direction; the reset mechanism connects the base and the shell.

12. The medical stapler according to claim 10 or 11, characterized in that: The reset mechanism is an elastic member connecting the linkage assembly and the housing.

13. The medical stapler according to claim 1, characterized in that: The medical stapler is a circumcision stapler, and the distal end of the anvil assembly is provided with a glans cavity for accommodating the glans.

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