Medical stapler

Abstract

The present invention provides a medical stapler, comprising: a stapler body, a stapler magazine assembly, an anvil assembly, and a safety mechanism, wherein the safety mechanism comprises: a safety block, which can move between a first position area of ​​a locking firing mechanism and a second position area of ​​an unlocking firing mechanism; an unlocking member, which is arranged between the anvil assembly and the safety block, and when the anvil assembly moves in a proximal direction along the axial direction of the stapler body, the anvil assembly acts on the unlocking member, so that the unlocking member drives the safety block to move from the first position area to the second position area; an elastic member, which is arranged between a shell and the safety block, and the elastic member provides a biasing force for driving the safety block to move from the second position area to the first position area; the safety mechanism can effectively prevent a doctor 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] The medical stapler is a medical device frequently used in surgical sutures of the esophagus, intestines and other digestive tracts as well as foreskin tissue. During the anastomosis, the two sections of tissue are brought inward to form a circular anastomotic 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 shell and a firing mechanism arranged on the shell;

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

[0011] A safety mechanism is disposed between the firing mechanism and the anvil assembly, and the safety mechanism comprises:

[0012] A safety block is disposed in the housing and is movable along the lateral direction of the stapler body between a first position area for locking the firing mechanism and a second position area for unlocking the firing mechanism;

[0013] an unlocking member, disposed between the anvil assembly and the safety block, wherein when the anvil assembly moves toward the proximal direction along the axial direction of the stapler body, the anvil assembly acts on the unlocking member, so that the unlocking member drives the safety block to move from the first position area to the second position area;

[0014] An elastic member is disposed between the housing and the safety block, and the elastic member provides a biasing force for driving the safety block to move from the second position area to the first position area.

[0015] 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 unlocking member to move the unlocking member toward the proximal end.

[0016] As a further improved technical solution of the present invention, the unlocking member includes a connecting portion sleeved on the anvil shaft, and a push rod extending from the connecting portion to the proximal end, the safety block is arranged at the proximal end of the push rod, the protrusion acts on the connecting portion, drives the push rod to move toward the proximal end, and drives the safety block to move from the first position area to the second position area.

[0017] As a further improved technical solution of the present invention, the medical stapler further comprises a stapler assembly disposed at the distal end of the shell; the stapler assembly is provided with a guide groove penetrating along the axial direction, and the push rod is movably disposed in the guide groove.

[0018] As a further improved technical solution of the present invention, the safety block comprises: a main body part movably connected to the housing;

[0019] An unlocking portion extending from the main body toward the distal end, the unlocking portion being matched with the push rod;

[0020] A locking portion extends from the main body toward the firing mechanism, and the locking portion cooperates with the firing mechanism.

[0021] As a further improved technical solution of the present invention, the proximal end of the push rod is provided with a first guide structure, and the distal end of the unlocking portion 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 unlocking member can drive the safety block to move laterally toward the second position area.

[0022] 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 increases 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 increases from the proximal end to the distal end.

[0023] As a further improved technical solution of the present invention, the firing mechanism includes a nail pushing rod arranged in the shell and a firing handle pivotally connected to the shell, the nail pushing rod can move along the axial direction of the stapler body, and the firing handle is located at the proximal end of the nail pushing rod, and when the safety block is in the first position area, the locking part locks the nail pushing rod.

[0024] As a further improved technical solution of the present invention, the nail pushing rod has a nail pushing rod body movably arranged on the anvil shaft, and a supporting portion arranged on the nail pushing rod body. When the safety block is located in the first position area, the locking portion acts on the distal end of the supporting portion to limit the movement of the nail pushing rod in the distal direction.

[0025] As a further improved technical solution of the present invention, the shell is provided with a first limiting portion, and the main body is provided with a second limiting portion, and the first limiting portion cooperates with the second limiting portion to enable the safety block to move laterally along the stapler body.

[0026] As a further improved technical solution of the present invention, one of the first limiting portion and the second limiting portion is a sliding groove, and the other is a sliding block.

[0027] As a further improved technical solution of the present invention, the elastic member is a compression spring arranged between the safety block and the shell, and the compression spring is arranged on a side of the safety block away from the axis of the stapler body.

[0028] As a further improved technical solution of the present invention, the safety block has a first marking portion arranged at a lateral interval and a second marking portion different from the first marking portion, and the shell is provided with an observation port, when the safety block is located in a first position area, the first marking portion is exposed from the observation port; when the safety block is located in a second position area, the second marking portion is exposed from the observation port.

[0029] As a further improved technical solution of the present invention, the first marking portion is red and the second marking portion is green.

[0030] As a further improved technical solution of the present invention, the medical stapler is a circumcision stapler.

[0031] The beneficial effect of the present invention is that the medical stapler of the present invention is provided with a safety mechanism. When the anvil assembly is not closed in place, the safety mechanism locks the firing mechanism, 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 formation and even medical accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic structural diagram of the medical stapler of the present invention.

[0033] Figure 2 yes Figure 1 A schematic structural diagram of the medical stapler shown in FIG.

[0034] Figure 3 yes Figure 2 A cross-sectional view taken along line AA when the anvil assembly in a traditional Chinese medicine stapler is in an open position.

[0035] Figure 4 yes Figure 3 Enlarged view of point B in FIG.

[0036] Figure 5 yes Figure 4 Schematic diagram of the structure of insurance institutions.

[0037] Figure 6 yes Figure 2 A cross-sectional view taken along the AA direction when the medical stapler is in a fireable state.

[0038] Figure 7 yes Figure 2 A cross-sectional view taken along the AA direction of the medical stapler in the completed firing state. 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 7 It 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 7 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 to apply multiple staples to the physiological tissue of the human body (here, foreskin tissue) and cut the corresponding foreskin 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 other circular tube staplers with double handles.

[0043] The medical stapler 100 comprises a stapler body 1 , an anvil assembly 3 axially movably connected to the stapler body 1 , and a safety mechanism 4 movably disposed in the stapler body 1 .

[0044] The stapler body 1 includes a shell 11, a firing mechanism arranged on the shell 11, a stapler assembly 2 arranged at the distal end of the shell 11, and a knob 15 arranged at the proximal end of the shell 11, wherein the knob 15 is used to drive the anvil assembly 3 to move axially along the stapler body 1.

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

[0046] Specifically, the firing mechanism includes a nail pushing rod 12 movably disposed in the shell 11, and a firing handle 13 pivotally connected to the shell 11 to act on the nail pushing rod 12. The nail pushing rod 12 can move axially along the stapler body 1 to achieve the firing of the staplers and / or cutters.

[0047] When the medical stapler 100 is in a firing state, the medical staff rotates the firing handle 13 to drive the stapler push rod 12 to move from the initial position to the firing position along the axial direction of the stapler body 1 to complete the anastomosis cutting of the foreskin tissue. At this time, the medical stapler 100 / the firing mechanism is in a firing completion state.

[0048] It can be understood that when the firing mechanism is in the initial state, the nail pushing rod 12 is located at the initial position; after the firing mechanism / the medical stapler 100 is in the firing completion state, the nail pushing rod 12 is located at the firing position.

[0049] In this embodiment, the firing handle 13 includes a pivot portion pivotally connected to the housing 11, a pushing portion abutting against the nail pushing rod 12, and an operating portion for medical personnel to operate. When the firing handle 13 rotates, the pushing portion directly abuts against the proximal end of the nail pushing rod 12 to drive the nail pushing rod 12 to move in the distal direction to achieve the firing of the medical stapler 100. However, this is not limited to the above, and a connecting member may also be provided to link the firing handle 13 and the nail pushing rod 12, so that when the firing handle 13 rotates, the nail pushing rod 12 is driven to move along the axial direction of the stapler body 1.

[0050] Furthermore, a reset spring 14 is sleeved on the nail pushing rod 12. When the firing handle 13 is rotated to drive the nail pushing rod 12 to move toward the distal end, the reset spring 14 is gradually compressed. When the gripping force applied to the firing handle 13 is canceled, the nail pushing rod 12 and the firing handle 13 are reset to the initial state under the biasing force of the reset spring 14. Of course, this is not limited to this. For example, a reset member that drives the firing handle 13 to reset can be additionally provided. When the gripping force is canceled, the reset member drives the firing handle 13 to reset.

[0051] Specifically, a protrusion 121 can be provided on the nail pushing rod 12, and the proximal end of the reset spring 14 is abutted against the protrusion 121, and the distal end of the reset spring 14 is abutted against the nail tube of the nail magazine assembly 2. Of course, this is not limited to the above, and the distal end of the reset spring 14 can also be abutted against the shell 11, as long as the distal end of the reset spring 14 can be limited.

[0052] 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.

[0053] Please refer to Figure 3 As shown, the nail magazine assembly 2 includes a nail barrel 21 disposed at the distal end of the housing 11, a nail pushing piece 22 disposed in the nail barrel 21, a cutter disposed on the nail pushing piece 22, and a nail magazine 23 disposed at the distal end of the nail barrel 21. The structures of the various components in the nail magazine assembly 2 and the coordination relationship between them are all existing in the art, and will not be described in detail here.

[0054] The proximal end of the nail pushing piece 22 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 22 to move synchronously, thereby achieving the firing and resetting of the nail pushing piece 22 .

[0055] The anvil assembly 3 can move along the axial direction of the stapler body 1. The anvil assembly 3 includes an anvil 31 and an anvil shaft 32 connected to the proximal end of the anvil 31. The anvil shaft 32 is inserted into the stapler body 1, and the proximal end of the anvil shaft 32 is threadedly connected to the knob 15. By rotating the knob 15, the anvil shaft 32 is driven to move along the axial direction of the stapler body 1, so as to drive the anvil 31 to move toward or away from the stapler cartridge assembly 2. When the anvil assembly 3 is closed in place, the anvil 31 and the stapler cartridge 23 clamp the physiological tissue, which is convenient for subsequent anastomosis cutting and can improve the anastomosis effect.

[0056] In a specific embodiment, the anvil shaft 32 includes an anvil shaft body 321 and a screw rod 322 which are arranged in sections, wherein the anvil shaft body 321 is fixedly connected to the anvil seat 31, and the screw rod 322 connects the anvil shaft body 321 and the knob 15. Of course, this is not limited to the above, and the anvil shaft body 321 and the screw rod 322 can also be arranged in one piece.

[0057] It can be understood that in the embodiment where the anvil shaft body 321 and the screw rod 322 are arranged in sections, the anvil shaft body 321 can be arranged integrally with the anvil 31 , but of course, it is not limited thereto.

[0058] It is understandable that in the embodiment where the medical stapler 100 is a circumcision stapler, the distal end of the anvil assembly 3 is further provided with a glans cavity 33 for accommodating the glans.

[0059] Please refer to Figure 4-Figure 7 As shown, the safety mechanism 4 is disposed between the firing mechanism and the anvil assembly 3. The safety mechanism 4 comprises a safety block 41 disposed in the housing 11, an unlocking member 42 for driving the safety block 41, and an elastic member 43.

[0060] The safety block 41 can move between the first position area and the second position area along the lateral direction of the stapler body 1. In this embodiment, the first position area is defined as being closer to the axis of the stapler body 1 than the second position area, that is, the first position area is closer to the stapler push rod 12 than the second position area; of course, this is not limited thereto.

[0061] When the safety block 41 is located in the first position area, the nail push rod 12 is located in the initial position, and the anvil assembly 3 is located in the open position. At this time, the safety block 41 locks the firing mechanism to prevent the nail push rod 12 from being fired, so that the nail push rod 12 cannot move from the initial position to the distal direction, and the medical stapler 100 is in a state where it cannot be fired.

[0062] It can be understood that the anvil assembly 3 is located in the open position, which specifically means that the anvil assembly 3 is not closed in place.

[0063] Specifically, the safety block 41 has a main body portion 411 movably connected to the shell 11, an unlocking portion 412 extending distally from the main body portion 411 to cooperate with the unlocking member 42, a locking portion 413 provided on the main body portion 411 to cooperate with the firing mechanism, and an elastic connecting portion 414 for connecting the elastic member 42.

[0064] In the present embodiment, when the safety block 41 is located in the first position area, the locking portion 413 locks the nail pushing rod 12 to limit the distal movement of the nail pushing rod 12. It can be understood that at this time, even if the firing handle 13 is held, the firing handle 13 that is supported on the nail pushing rod 12 cannot be rotated because the safety block 41 limits the distal movement of the nail pushing rod 12.

[0065] Of course, it is not limited thereto. When the safety block 41 is located in the first position area, the locking portion 413 can also be configured to lock the firing handle 13 to limit the rotation of the firing handle 13, thereby indirectly preventing the nail push rod 12 from being fired.

[0066] Please refer to Figure 3-Figure 7 In the illustrated embodiment, the nail pushing rod 12 includes a nail pushing rod body 122 movably disposed on the anvil shaft 32, and a supporting portion 123 connected to the nail pushing rod body 122. When the anvil assembly 3 is located in the open position and the safety block 41 is located in the first position area, the locking portion 413 is supported at the distal end of the supporting portion 123 to lock the nail pushing rod 12 and prevent the nail pushing rod 12 from moving in the distal direction to the firing position.

[0067] Of course, it can be understood that the locking method of the locking portion 413 to lock the nail pushing rod 12 is not limited to this. For example, the locking portion 413 can be set to a groove. When the safety block 41 is located in the first position area, at least part of the structure of the supporting portion 123 is accommodated in the locking portion 413 (groove) to lock the nail pushing rod 12; or a limiting groove is directly set on the nail pushing rod body 122. When the safety block 41 is located in the first position area, at least part of the structure of the locking portion 413 is limited in the limiting groove to lock the nail pushing rod 12.

[0068] In a specific embodiment, the abutting portion 123 is provided at the proximal end of the nail pushing rod 12 and extends in the transverse direction, and the locking portion 413 is formed by extending from the main body 411 in the proximal direction to cooperate with the abutting portion 123. Of course, it is not limited thereto, and it can be understood that the abutting portion 123 and the locking portion 413 can be configured to lock the nail pushing rod 12 when the safety block 41 is located in the first position area, so as to limit the movement of the nail pushing rod 12 toward the distal end.

[0069] It can be understood that, in this embodiment, the supporting portion 123 can be a part of the protrusion 121 to simplify the structure of the nail pushing rod 12. At this time, in the embodiment where the protrusion 121 (supporting portion 123) is arranged at the proximal end of the nail pushing rod body 122, the nail pushing rod 12 is T-shaped from the proximal end to the distal end.

[0070] When the safety block 41 is located in the second position area, the firing mechanism is unlocked, and the nail pushing rod 12 can be fired to move from the initial position to the firing position. It can be understood that when the safety block 41 is located in the second position area, the locking portion 413 is not on the moving path of the nail pushing rod 12, nor on the rotating path of the firing handle 13, so that the firing handle 13 can be rotated to drive the nail pushing rod 12 to move from the initial position to the firing position, completing the firing of the medical stapler 100.

[0071] It should be noted that, during the movement of the safety block 41 between the first position area and the second position area, the locking portion 413 always locks the firing mechanism, and the firing mechanism is in an unlocked state only when the safety block 41 is located in the second position area.

[0072] Furthermore, the housing 11 is provided with a first limiting portion, and the main body 411 is provided with a second limiting portion, and the first limiting portion cooperates with the second limiting portion to guide the safety block 41 to move laterally along the stapler body 1, so that the unlocking member 42 can drive the safety block 41 to move laterally between the first position area and the second position area. In this embodiment, the first limiting portion and the second limiting portion include a slide groove 111 and a slider 415 that cooperate with each other, and the slide groove 111 extends laterally along the housing 11, but of course, it is not limited to this.

[0073] In this embodiment, the slider 415 is disposed on the main body 411, and the slide groove 111 is disposed on the housing 11. Of course, this is not limited to this, for example, the slider 415 can also be disposed on the housing 11, and in this case, the slide groove 111 is disposed on the main body 411.

[0074] In a specific embodiment, the slide grooves 111 are provided at opposite positions on the two sub-shells, and the sliders 415 are provided on opposite sides of the main body 411, so that the opposite sides of the safety block 41 are slidably connected to the corresponding slide grooves 111, thereby enhancing the stability of the movement of the safety block 41. Of course, this is not limited to this, and in other embodiments, the slide groove 111 can also be provided on only one of the sub-shells, as long as it can guide the safety block 41 to move between the first position area and the second position area in the lateral direction.

[0075] In a preferred embodiment of the present invention, the medical stapler 100 includes two safety mechanisms 4, which are arranged on opposite axial sides of the nail push rod 12, and the two safety blocks 41 correspond to the two firing handles 13 one by one, and the two safety mechanisms are integrally arranged and sleeved on the anvil assembly 3 to enhance the locking effect of the safety mechanism 4. Of course, it can be understood that the specific number of the safety mechanisms 4 is not limited to the above two, and can be set according to specific circumstances.

[0076] It can be understood that in the embodiment where the medical stapler 100 includes two integrally arranged safety mechanisms 4, the shell 11 is provided with two slide grooves 111 respectively cooperating with the two safety blocks 41, and the two slide grooves 111 are symmetrically arranged on opposite sides of the nail pushing rod 12.

[0077] Furthermore, the first limiting portion and the second limiting portion further include a first stopping portion 112 and a second stopping portion 416 respectively cooperating with each other.

[0078] In a specific embodiment, the first stop portion 112 includes a first limit block 1121 provided on the shell 11 and corresponding to the first position area, and the second stop portion 416 includes a first limit groove 4161 cooperating with the first limit block 1121, and the first limit groove 4161 is provided on the main body 411.

[0079] When the safety block 41 is located in the first position area, at least part of the structure of the first limiting block 1121 is located in the first limiting groove 4161. On the one hand, the safety block 41 located in the first position area is limited from moving axially along the stapler body 1. When the unlocking member 42 acts on the safety block 41, the safety block 41 can only move laterally to the second position area. At the same time, the first limiting block 1121 cooperates with the first limiting groove 4161 to guide the safety block 41 to move laterally between the first position area and the second position area. On the other hand, when the user misoperates the firing handle 13 and the pushing force applied to the nail pushing rod 12 is transmitted to the safety block 41, the safety block 41 cannot move in the distal direction. Therefore, no mutual pushing force will be generated between the safety block 41 and the unlocking member 42, and the safety block 41 will not move to the second position area. That is, the safety block 41 will leave the first position area only when driven by the unlocking member 42, thereby enhancing the locking effect of the safety block 41.

[0080] Specifically, the first limiting groove 4161 is formed by being recessed from the side of the main body 411 close to the nail pushing rod 12 to the side away from the nail pushing rod 12. At this time, the main body 411 is in a U-shape with a side opening. Of course, it is not limited thereto. The first limiting groove 4161 can also be a long groove with both ends closed extending in the transverse direction. When the safety block 41 moves between the first position area and the second position area, the first limiting block 1121 is always received in the first limiting groove 4161 and moves along the first limiting groove 4161.

[0081] At the same time, in this embodiment, when the safety block 41 is located in the second position area, part of the structure of the first limit block 1121 is still located in the first limit groove 4161. During the movement of the safety block 41 between the first position area and the second position area, the first limit block 1121 always cooperates with the first limit groove 4161, so that the safety block 41 can only move along the lateral direction of the stapler body 1 and guide the safety block 41 to move between the first position area and the second position area. Of course, it is not limited to this. When the safety block 41 is located in the second position, the first limit block 1121 can also be separated from the first limit groove 4161.

[0082] Furthermore, the first stop portion 112 further includes a second limit groove 1122 corresponding to the second position region, and the second stop portion 416 further includes a second limit block 4162 matched with the second limit groove 1122. The second limit groove 1122 opens toward the main body 411, and when the safety block 41 is located in the second position region, at least a portion of the second limit block 4162 is accommodated in the second limit groove 1122.

[0083] During the movement of the anvil assembly 3 from the open position to the proximal end, the anvil assembly 3 acts on the unlocking member 42, so that the unlocking member 42 drives the safety block 41 to move from the first position area to the second position area, and when the anvil assembly 3 moves to the closed position, the safety block 41 is located in the second position area, unlocking the firing mechanism. Thus, by setting the safety mechanism 4, the firing mechanism can only be fired when the anvil assembly 3 is in the closed position. At this time, the medical stapler 100 is in a firing state, which can effectively prevent the doctor from firing the staples and the cutter when the anvil assembly 3 is not closed in place, resulting in poor staple formation and even medical accidents.

[0084] It can be understood that when the anvil assembly 3 is located in the closed position, it means that the anvil assembly 3 is closed in place.

[0085] The above-mentioned firing state means that the anvil assembly 3 is closed in place, so that the nail magazine assembly 2 and the anvil 31 have clamped the foreskin tissue to be cut in place, and the firing mechanism is in an unlocked state.

[0086] Furthermore, the anvil assembly 3 also includes a protrusion 34 arranged on the outer periphery of the anvil shaft 32, and the unlocking member 42 is arranged at the proximal end of the protrusion 34. When the anvil assembly 3 moves toward the proximal end, the protrusion 34 abuts against the unlocking member 42 to drive the unlocking member 42 to move toward the proximal end.

[0087] In a specific embodiment, the unlocking member 42 is sleeved on the anvil shaft 32, and the protrusion 34 is annular to resist and act on the unlocking member 42. However, this is not limited to the above, and the protrusion 34 may not be annular. It is understandable that the protrusion 34 only needs to be able to resist and act on the unlocking member 42.

[0088] It is understandable that in the embodiment where the anvil shaft 32 has a segmented anvil shaft body 321 and a screw rod 322, the protrusion 34 can be arranged on the outer periphery of the anvil shaft body 321, or on the outer periphery of the screw rod 322. As long as it is possible to achieve driving the unlocking member 42 to move proximally during the process of the anvil assembly 3 moving proximally.

[0089] It can be understood that the outer diameter of the proximal end of the anvil shaft body 321 is generally larger than the outer diameter of the screw rod 322, so that in the embodiment where the protrusion 34 is arranged on the outer periphery of the anvil shaft body 321, the protrusion 34 can be used as a part of the anvil shaft body 321. For example, the proximal end of the anvil shaft body 321 can be set as the protrusion 34. When the anvil assembly 3 moves toward the proximal end, the proximal end of the anvil shaft body 321 can abut against the unlocking member 42, driving the unlocking member 42 to move synchronously in the proximal direction, so as to drive the safety block 41 to move from the first position area to the second position area. Of course, this is not limited to this, and the protrusion 34 can also be arranged at other axial parts of the anvil shaft body 321, as long as the protrusion 34 can drive the unlocking member 42 to move synchronously in the proximal direction when the anvil assembly 3 moves toward the proximal direction.

[0090] Furthermore, the staple cartridge assembly 2 is provided with a guide groove 25 that axially penetrates the staple cartridge assembly 2. The unlocking member 42 includes a connecting portion 421 located in the staple cartridge assembly 2 to cooperate with the protrusion 34, and a push rod 422 extending from the connecting portion 421 to the proximal end. The push rod 422 enters the housing 11 from the inner side of the staple cartridge assembly 2 through the guide groove 25 and cooperates with the unlocking portion 412, that is, the proximal end of the push rod 422 abuts and cooperates with the unlocking portion 412 of the safety block 41.

[0091] In the present invention, the inner side of the nail magazine assembly 2 refers to the side of the nail magazine assembly 2 close to the axis of the nail magazine assembly 2, and more specifically, refers to the side of the nail pushing piece 22 close to its axis. It can be understood that the guide groove 25 penetrates the nail barrel 21 and the nail pushing piece 22 at the same time, so that the push rod 422 can pass through the guide groove 25 and pass out from the inner side of the nail magazine assembly 2, so as to enter the housing 11 and cooperate with the safety block 41.

[0092] During the process of the unlocking member 42 moving along the axial direction of the medical stapler 100 , the push rod 422 moves along the guide groove 25 to limit the moving direction of the unlocking member 42 .

[0093] In the embodiment where the medical stapler 100 has two safety mechanisms 4, the two unlocking members 42 share a connecting portion 421, the connecting portion 421 is sleeved on the anvil shaft 32, and the two push rods 422 are connected to opposite ends of the connecting portion 421. When the anvil assembly 3 moves from the open position to the closed position, the protrusion 34 acts on the connecting portion 421 to drive the two push rods 422 to move synchronously in the proximal direction, and synchronously drive the corresponding safety block 41 to move to the second position area. Of course, it is not limited to this, as long as the anvil assembly 3 can synchronously drive the two unlocking members 42 to move in the proximal direction.

[0094] In this embodiment, the push rod 422 is detachably connected to the connecting portion 421, which facilitates the assembly of the unlocking member 42. Of course, it is not limited thereto, and the push rod 422 can also be fixedly connected to the connecting portion 421.

[0095] Furthermore, a guide structure 44 is provided between the safety block 41 and the unlocking member 42 to guide the relative movement between the unlocking member 42 and the safety block 41 .

[0096] In this embodiment, the above-mentioned guiding the unlocking member 42 and the safety block 41 to move relative to each other includes that during the process of the anvil assembly 3 moving from the open position to the closed position, the unlocking member 42 moves axially toward the proximal direction to drive the safety block 41 to move laterally toward the second position area; and during the process of the anvil assembly 3 moving from the closed position to the open position, the safety block 41 moves laterally toward the first position area to drive the unlocking member 42 to move axially toward the distal direction. Of course, this is not limited to this.

[0097] Please refer to Figure 5 In the illustrated embodiment, the guide structure 44 includes a first guide structure 441 disposed at the proximal end of the push rod 422 and a second guide structure 442 disposed at the distal end of the unlocking portion 412. When the unlocking member 42 moves toward the proximal end, the first guide structure 441 cooperates with the second guide structure 442 to move the safety block 41 laterally toward the second position region. Of course, this is not limited to this, and the guide structure may be disposed only on the push rod 422 or the unlocking portion 412, as long as it can guide the relative movement between the unlocking member 42 and the safety block 41.

[0098] In a specific embodiment, the first guide structure 441 is a first guide slope, and the second guide structure 442 is a second guide slope, that is, the unlocking portion 412 and the push rod 422 are matched with guide slopes, which has a simpler structure and more stable matching. Of course, this is not limited to this.

[0099] Specifically, the distances between the first guide slope and the second guide slope and the axis gradually increase from the proximal end to the distal end. When the unlocking member 42 moves toward the proximal end, the safety block 41 can be driven to move from the first position area to the second position area farther away from the axis.

[0100] Specifically, the nail magazine assembly 2 also includes a limiting cylinder 24 arranged in the nail tube 21. When the anvil assembly 3 moves between the open position and the closed position, the anvil assembly 3 moves along the limiting cylinder 24, which can guide the anvil assembly 3 to move along the axial direction of the medical stapler 100 to prevent the anvil assembly 3 from shaking during the movement.

[0101] The unlocking member 42 is located at the proximal end of the limiting cylinder 24. When the anvil assembly 3 moves from the open position to the closed position, the proximal end of the anvil shaft body 321 passes through the proximal end of the limiting cylinder 24 and acts on the unlocking member 42 to push the unlocking member 42 to move in the proximal direction, so as to drive the safety block 41 to move from the first position area to the second position area.

[0102] Furthermore, a first matching portion 3211 is provided on the anvil shaft body 321, and a second matching portion 241 is provided on the limiting cylinder 24. When the anvil assembly 3 moves to the closed position, the first matching portion 3211 cooperates with the second matching portion 241 to limit the anvil assembly 3 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.

[0103] In this embodiment, the first matching portion 3211 is a step portion arranged at the distal end of the anvil shaft body 321, and the second matching portion 241 is the distal end surface of the limiting cylinder 24. When the anvil assembly 3 moves to the closed position, the proximal end surface of the step portion abuts against the distal end surface of the limiting cylinder 24 to limit the anvil assembly 3 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.

[0104] Of course, it is not limited to this. For example, the second matching portion 241 can also be arranged at the proximal end of the limiting cylinder 24 and protrude toward the central axis of the limiting cylinder 24. It can be understood that the first matching portion 3211 and the second matching portion 241 only need to be configured to limit the anvil assembly 3 from continuing to move in the proximal direction when the anvil assembly 3 moves to the closed position.

[0105] Furthermore, when the safety block 41 is located in the first position area, the unlocking member 42 abuts against the proximal end of the limiting cylinder 24 to limit the axial movement of the unlocking member 42 toward the proximal end, thereby enhancing the stability of the unlocking member 42 .

[0106] The elastic member 43 is disposed between the housing 11 and the safety block 41, and the elastic member 43 is used to provide a biasing force to drive the safety block 41 to move from the second position area to the first position area. After the thrust applied by the unlocking member 42 to the safety block 41 is cancelled, the elastic member 43 drives the safety block 41 to move from the second position area to the first position area to lock the nail push rod 12, so that when the glans anvil assembly 3 is not closed to the closed position, the nail push rod 12 is always in a state where it cannot be fired, which can prevent medical staff from firing by mistake, resulting in poor staple formation, and even causing medical accidents.

[0107] In this embodiment, the elastic member 43 is located at the side of the safety block 41 away from the nail pushing rod 12. It can be understood that at this time, the elastic connection portion 414 is located at the side of the main body 411 away from the nail pushing rod 12. One end of the elastic member 43 is connected to the elastic connection portion 414, and the other end is connected to the second limiting groove 1122. Of course, this is not limited to this.

[0108] During the movement of the safety block 41 from the first position area to the second position area, the elastic member 43 is gradually compressed. Therefore, when the nail pushing rod 12 is located at the initial position and the anvil assembly 3 moves to the open position, the pressure applied by the unlocking member 42 to the safety block 41 gradually disappears. Driven by the biasing force of the elastic member 43, the safety block 41 moves from the second position area to the first position area. At the same time, the safety block 41 drives the unlocking member 42 to move toward the distal direction.

[0109] In a specific embodiment, the elastic member 43 is a compression spring connecting the safety block 41 and the shell 11. Of course, the elastic member 43 is not limited to the compression spring, and can also be a spring block or other structure, as long as it can drive the safety block 41 to switch from the second position area to the first position area.

[0110] Furthermore, the main body 411 has a first marking portion 417 arranged at a lateral interval and a second marking portion 418 different from the first marking portion 417, and the shell 11 is provided with an observation port 113. When the safety block 41 is in the first position, the first marking portion 417 is exposed from the observation port 113; when the safety block 41 is in the second position, the second marking portion 418 is exposed from the observation port 113. Therefore, through the observation port 113, medical staff can intuitively identify the position of the safety block 41 to determine whether the anvil assembly 3 is closed in place, which can prevent medical staff from making mistakes in judgment and accidentally firing when the anvil assembly 3 is not closed in place, resulting in poor formation of the anastomosis staples and even causing medical accidents.

[0111] In a specific embodiment, the first marking portion 417 is red and the second marking portion 418 is green; of course, it is not limited to this, and the first marking portion 417 and the second marking portion 418 can also be distinguished by other colors or other methods, such as patterns.

[0112] In an embodiment in which the slider 415 is disposed on the main body 411 , the first marking portion 417 and the second marking portion 418 may be disposed on the slider 415 to simplify the structure of the safety block 41 .

[0113] Compared with the prior art, the medical stapler 100 of the present invention is provided with a safety mechanism 4. When the anvil assembly 3 is not closed in place, the safety mechanism 4 locks the firing mechanism, which can effectively prevent the doctor from firing the staples and the cutter when the anvil assembly 3 is not closed in place, resulting in poor staple formation and even medical accidents.

[0114] 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.

[0115] 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 shell and a firing mechanism arranged on the shell; an anvil assembly, wherein the anvil assembly can move along the axial direction of the stapler body; The medical stapler further comprises: a safety mechanism disposed between the firing mechanism and the anvil assembly, and the safety mechanism is provided with: a safety block, which is disposed in the shell and can move along the lateral direction of the stapler body between a first position region for locking the firing mechanism and a second position region for unlocking the firing mechanism, wherein the safety block comprises a main body portion movably connected to the shell along the lateral direction, an unlocking portion extending from the main body portion to the distal end, and a locking portion extending from the main body portion toward the firing mechanism, wherein when the safety block is located in the first position region, the locking portion locks the firing mechanism; An unlocking member is movably disposed between the anvil assembly and the safety block along the axial direction, the distal end of the unlocking member cooperates with the anvil assembly, and the proximal end of the unlocking member cooperates with the unlocking portion, when the anvil assembly moves toward the proximal direction along the axial direction of the stapler body, the anvil assembly drives the unlocking member to move toward the proximal direction synchronously, so that the unlocking member drives the safety block to move from the first position area to the second position area; An elastic member is disposed between the housing and the safety block, and the elastic member provides a biasing force for driving the safety block to move from the second position area to the first position area.

2. 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 unlocking member to make the unlocking member move toward the proximal end.

3. The medical stapler according to claim 2, characterized in that: The unlocking member includes a connecting portion sleeved on the anvil shaft, and a push rod extending from the connecting portion to the proximal end, the safety block is arranged at the proximal end of the push rod, the push rod cooperates with the unlocking portion, the protrusion acts on the connecting portion, drives the push rod to move toward the proximal end, and drives the safety block to move from the first position area to the second position area.

4. The medical stapler according to claim 3, characterized in that: The medical stapler also includes a stapler assembly disposed at the distal end of the shell; the stapler assembly is provided with a guide groove penetrating along the axial direction; and the push rod is movably disposed in the guide groove.

5. The medical stapler according to claim 3, characterized in that: A first guide structure is provided at the proximal end of the push rod, and a second guide structure adapted to the first guide structure is provided at the distal end of the unlocking portion. The first guide structure cooperates with the second guide structure so that the unlocking member can drive the safety block to move laterally toward the second position area.

6. The medical stapler according to claim 5, characterized in that: The first guiding structure is a first guiding slope, and the distance between the first guiding slope and the axis gradually increases 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 increases from the proximal end to the distal end.

7. The medical stapler according to claim 3, characterized in that: The firing mechanism includes a nail pushing rod arranged in the shell and a firing handle pivotally connected to the shell. The nail pushing rod can move along the axial direction of the stapler body, and the firing handle is located at the proximal end of the nail pushing rod. When the safety block is located in the first position area, the locking part locks the nail pushing rod.

8. The medical stapler according to claim 7, characterized in that: The nail pushing rod comprises a nail pushing rod body movably arranged on the anvil shaft and a supporting portion arranged on the nail pushing rod body. When the safety block is located in the first position area, the locking portion acts on the distal end of the supporting portion to limit the movement of the nail pushing rod in the distal direction.

9. The medical stapler according to claim 1, characterized in that: The shell is provided with a first limiting portion, and the main body is provided with a second limiting portion, and the first limiting portion cooperates with the second limiting portion to enable the safety block to move laterally along the stapler body.

10. The medical stapler according to claim 9, characterized in that: One of the first limiting portion and the second limiting portion is a sliding groove, and the other is a sliding block.

11. The medical stapler according to claim 1, characterized in that: The elastic member is a compression spring arranged between the safety block and the shell, and the compression spring is arranged on a side of the safety block away from the axis of the stapler body.

12. The medical stapler according to claim 1, characterized in that: The safety block has a first marking portion arranged at a lateral interval, and a second marking portion different from the first marking portion. The shell is provided with an observation port. When the safety block is located in a first position area, the first marking portion is exposed from the observation port; when the safety block is located in a second position area, the second marking portion is exposed from the observation port.

13. The medical stapler according to claim 12, characterized in that: The first marking portion is red, and the second marking portion is green.

14. The medical stapler according to claim 1, characterized in that: The medical stapler is a circumcision stapler.

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