CN111374730A - Medical anastomat - Google Patents

Abstract

The present invention provides a medical stapler, comprising: a stapler body, a staple cartridge assembly, an anvil assembly, and a safety mechanism, wherein the safety mechanism has a safety block, which can lock the firing mechanism at a first position area and unlock the firing mechanism at a second position The unlocking member is arranged between the anvil assembly and the safety block. 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 from the first A position area moves to a second position area; an elastic piece is arranged between the housing and the safety block, the elastic piece provides a biasing force for driving the safety block to move from the second position area to the first position area; it can be This effectively prevents 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.

Description

medical stapler

technical field

The invention relates to the field of medical instruments, in particular to a medical stapler.

Background technique

Medical stapler is a medical device that is often used in the surgical suture of esophagus, intestine and other digestive tract and foreskin tissue. During anastomosis, the two sections of tissue are restrained and an annular anastomosis ring is formed inside the tissue. The resulting body hemorrhage is expelled along with the contents, and the tissue is easier to heal after surgery.

Existing medical staplers for treating alimentary canal, excessive foreskin, 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 casing, a staple cartridge assembly arranged at the distal end of the casing and matched with the anvil assembly, and a staple push rod arranged in the casing and linked with the firing handle.

When the anvil assembly is closed in place, the medical stapler reaches a fireable state. In the prior art, the general operator judges whether the medical stapler has reached the fireable state by his own feeling, and fires the staples and the cutter after the medical stapler reaches the fireable state.

However, on the one hand, the operator makes a judgment based on his own feeling and experience, which is likely to cause the anvil assembly to not close properly, resulting in poor staple forming; When closed in place, the staples and the cutter are fired by mistake, resulting in poor staple formation and even medical accidents.

In view of this, it is necessary to provide a new medical stapler to solve the above problems.

SUMMARY OF THE INVENTION

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

In order to achieve the above-mentioned purpose of the invention, the present invention adopts the following technical solutions: a medical stapler, comprising:

a stapler body, comprising a casing and a firing mechanism cooperating with the casing;

an anvil assembly movable in the axial direction of the stapler body;

A safety mechanism is arranged between the firing mechanism and the anvil assembly, and the safety mechanism is provided with:

a safety block, which is arranged in the housing and can move 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;

The unlocking piece is arranged between the anvil assembly and the safety block. When the anvil assembly moves toward the proximal direction along the axial direction of the stapler body, the anvil assembly acts on the unlocking piece to make the anvil assembly move toward the proximal end. The unlocking member drives the safety block to move from the first position area to the second position area;

The elastic piece is arranged between the housing and the safety block, and the elastic piece provides a biasing force for driving the safety block to move from the second position area to the first position area.

As a further improved technical solution of the present invention, the anvil assembly includes an anvil seat, an anvil shaft connected to the proximal end of the anvil seat, and a protrusion provided on the outer circumference of the anvil shaft, and the protrusion acts on the anvil shaft The unlocking member moves the unlocking member proximally.

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, and the safety block is provided on the push rod The protruding block acts on the connecting part to drive 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.

As a further improved technical solution of the present invention, the medical stapler further includes a staple cartridge assembly disposed at the distal end of the housing; the staple cartridge assembly is provided with a guide groove extending through the axial direction, and the push rod The movement is arranged in the guide groove.

As a further improved technical solution of the present invention, the safety block has: a main body part movably connected in the housing;

an unlocking portion extending from the main body portion to the distal end, the unlocking portion is matched with the push rod;

A locking portion extending from the body portion toward the firing mechanism, the locking portion cooperating with the firing mechanism.

As a further improved technical solution of the present invention, the proximal end of the push rod is provided with a first guide structure, 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 is provided at the distal end of the unlocking portion. A guide structure cooperates with the second guide structure, so that the unlocking member can drive the safety block to move laterally to the second position area.

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 shaft center gradually increases from the proximal end to the distal end; the second guide structure is a first guide slope. Two guide slopes, the distance between the second guide slope and the shaft center gradually increases from the proximal end to the distal end.

As a further improved technical solution of the present invention, the firing mechanism includes a nail push rod disposed in the housing and a firing handle pivotally connected to the housing, the nail push rod can move along the stapler body and the firing handle is located at the proximal end of the push rod, when the safety block is located in the first position area, the locking portion locks the push rod.

As a further improved technical solution of the present invention, the nail push rod has a nail push rod body movably arranged on the anvil shaft, and a resisting portion provided on the nail push rod body. In a position area, the locking portion acts on the distal end of the abutting portion to restrict the push rod from moving in the distal direction.

As a further improved technical solution of the present invention, the casing is provided with a first limiting portion, the main body portion is provided with a second limiting portion, and the first limiting portion cooperates with the second limiting portion, so as to move the safety block along the lateral direction of the stapler body.

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

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

As a further improved technical solution of the present invention, the safety block has a first marking part arranged at intervals along the lateral direction and a second marking part different from the first marking part; When the safety block is located in the first position area, the first marking part is exposed from the observation port; when the safety block is located in the second position area, the second marking part is exposed from the observation port.

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

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

The beneficial effects of the present invention are: in the medical stapler of the present invention, by setting 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 closing the anvil assembly. The staples and the cutter are fired without being in place, resulting in poor staple formation and even medical accidents.

Description of drawings

FIG. 1 is a schematic structural diagram of a medical stapler in the present invention.

FIG. 2 is a schematic structural diagram of the medical stapler shown in FIG. 1 from another angle.

FIG. 3 is a cross-sectional view taken along A-A when the anvil assembly in the medical stapler of FIG. 2 is in an open position.

FIG. 4 is an enlarged view of B in FIG. 3 .

FIG. 5 is a schematic structural diagram of the insurance mechanism in FIG. 4 .

FIG. 6 is a cross-sectional view taken along the A-A direction when the medical stapler in FIG. 2 is in a fireable state.

FIG. 7 is a cross-sectional view taken along the A-A direction when the medical stapler of FIG. 2 is in a firing completed state.

Detailed ways

The present invention will be described in detail below with reference to the various embodiments shown in the accompanying drawings. Please refer to FIG. 1 to FIG. 7 , which are preferred embodiments of the present invention. However, it should be noted that these embodiments do not limit the present invention, and equivalent transformations or substitutions in functions, methods, or structures made by those of ordinary skill in the art according to these embodiments all fall within the protection scope of the present invention.

The words expressing position and direction described in the present invention are all based on the instrument operator, the end close to the instrument operator is the proximal end, and the end far from the instrument operator is the distal end; the axial direction in the present invention refers to the proximal end. The longitudinal direction of the component, 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 should not be construed as indicating or implying relative importance or implying the number of indicated technical features.

Referring to FIGS. 1 to 7 , the present invention provides a medical stapler 100 , which is used for applying a plurality of staples to the physiological tissue of the human body and simultaneously cutting the corresponding physiological tissue.

The medical stapler 100 in the embodiment of the present invention is a cylindrical stapler, and a circumcision stapler for performing a circumcision operation is taken as an example for specific illustration. The staples are applied to the physiological tissue of the human body (here referred to as the foreskin tissue), while cutting the corresponding foreskin tissue. However, it should be noted that the technical spirit involved in the following embodiments can be alternatively applied to other forms of staplers, such as other cylindrical staplers with double handles.

The medical stapler 100 includes 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 .

The stapler body 1 includes a housing 11 , a firing mechanism arranged on the housing 11 , a staple cartridge assembly 2 arranged at the distal end of the housing 11 , and a proximal end of the housing 11 . The knob 15 is used to drive the anvil assembly 3 to move in the axial direction of the stapler body 1 .

Preferably, the casing 11 is formed by splicing two sub casings.

Specifically, the firing mechanism includes a nail push rod 12 movably disposed in the housing 11 , and a firing handle 13 pivotally connected to the housing 11 to act on the nail push rod 12 . The staple shaft 12 can move in the axial direction of the stapler body 1 to achieve the firing of staples and/or cutters.

When the medical stapler 100 is in a fireable state, the medical staff rotates the firing handle 13, and drives the 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 foreskin tissue. At this time, the medical stapler 100/the firing mechanism is in a firing completed state.

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 at the firing position.

In this embodiment, the firing handle 13 includes a pivot portion pivotally connected to the housing 11 , a push portion pressed against the nail push rod 12 , and an operation portion for medical personnel to operate. When the firing handle 13 rotates, the pushing portion directly abuts against the proximal end of the push rod 12 to drive the push rod 12 to move in the distal direction, thereby realizing the firing of the medical stapler 100 . However, it is not limited to this, and a connecting piece may be additionally provided to link the firing handle 13 and the push rod 12 , so that when the firing handle 13 is rotated, the push rod 12 is driven along the stapler body 1 . axial movement.

Further, a return spring 14 is sleeved on the nail push rod 12 . During the process of rotating the firing handle 13 to drive the nail push rod 12 to move in the distal direction, the return spring 14 is gradually compressed. When the gripping force exerted on the firing handle 13 is cancelled, under the action of the biasing force of the return spring 14, the nail push rod 12 and the firing handle 13 are reset to the initial state; of course, Not limited to this, for example, a reset member for driving the firing handle 13 to reset may be additionally provided, and when the gripping force is canceled, the reset member drives the firing handle 13 to reset.

Specifically, a convex portion 121 may be provided on the push rod 12 , the proximal end of the return spring 14 abuts on the convex portion 121 , and the distal end of the return spring 14 abuts against the staple cartridge assembly 2, of course, it is not limited to this, the distal end of the return spring 14 can also be against the housing 11, as long as the limit of the distal end of the return spring 14 can be achieved. .

In this embodiment, two firing handles 13 are symmetrically disposed on opposite sides of the housing 11 , but not limited to this, and only one firing handle 13 may be provided.

Referring to FIG. 3 , the staple cartridge assembly 2 includes a staple barrel 21 provided at the distal end of the housing 11 , a staple push piece 22 provided in the staple barrel 21 , and a staple push piece provided on the staple barrel 21 . The cutter on 22 , and the staple cartridge 23 located at the distal end of the staple barrel 21 . The structures of the components in the staple cartridge assembly 2 and the matching relationship between them are all existing in the art, and will not be repeated here.

The proximal end of the nail push piece 22 is connected with the distal end of the nail push rod 12 , so that the nail push rod 12 can drive the nail push piece 22 to move synchronously, so as to realize the firing and reset of the nail push piece 22 .

The anvil assembly 3 is movable along the axial direction of the stapler body 1 . The anvil assembly 3 includes an anvil 31 , 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 It 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 approach or move away from the staple cartridge assembly. 2, when the anvil assembly 3 is closed in place, the anvil 31 and the staple cartridge 23 clamp the physiological tissue, which is convenient for subsequent anastomosis and cutting, and can improve the anastomosis effect.

In a specific embodiment, the anvil shaft 32 includes a segmented anvil shaft body 321 and a screw rod 322 , the anvil shaft body 321 is fixedly connected to the anvil 31 , and the screw rod 322 is connected to the The anvil shaft body 321 and the knob 15 . Of course, it is not limited to this, and the anvil shaft body 321 and the screw rod 322 may also be integrally provided.

It can be understood that, in the embodiment in which the anvil shaft body 321 and the screw rod 322 are arranged in sections, the anvil shaft body 321 and the anvil seat 31 can be integrally formed, of course, it is not limited to this .

It can be understood that, in the embodiment in which 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.

Referring to FIGS. 4-7 , the safety mechanism 4 is provided between the firing mechanism and the anvil assembly 3 . The safety mechanism 4 includes a safety block 41 disposed in the housing 11 , an unlocking member 42 for driving the safety block 41 , and an elastic member 43 .

The safety block 41 can move between a first position area and a second position area along the lateral direction of the stapler body 1 . In this embodiment, it is defined that the first location area is closer to the axis of the stapler body 1 than the second location area, that is, the first location area is closer to the second location area The nail push rod 12; of course, it is not limited to this.

When the safety block 41 is located in the first position area, the nail push rod 12 is in the initial position, and the anvil assembly 3 is in the open position, at this time, the safety block 41 locks the firing mechanism, preventing all The push rod 12 is fired, so that the 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.

It can be understood that the anvil assembly 3 is in the open position, specifically, the anvil assembly 3 is not closed in place.

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

In this embodiment, when the safety block 41 is located in the first position area, the locking portion 413 locks the push rod 12 and restricts the push rod 12 from moving to the distal end. It can be understood that at this time, Even if the firing handle 13 is held, because the safety block 41 restricts the push rod 12 from moving in the distal direction, the firing handle 13 against the push rod 12 cannot be rotated.

Of course, it is not limited to this, 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 restrict the firing handle 13 from rotating, thereby indirectly preventing the push nail The rod 12 is fired.

Referring to the embodiments shown in FIGS. 3 to 7 , the nail push rod 12 includes a nail push rod body 122 movably disposed on the anvil shaft 32 , and a pusher rod body 122 connected to the push rod body 122 . When the anvil assembly 3 is in the open position and the safety block 41 is in the first position area, at this time, the locking portion 413 abuts against the distal end of the abutting portion 123 to lock the The push rod 12 prevents the push rod 12 from moving in the distal direction to the firing position.

Of course, it can be understood that the locking manner of the locking portion 413 for locking the nail push rod 12 is not limited to this. For example, the locking portion 413 may be configured as a groove, and the safety block 41 is located at the first position. At least part of the structure of the resisting portion 123 is accommodated in the locking portion 413 (groove) to lock the push rod 12; or a limiting groove is directly provided on the push rod body 122 , when the safety block 41 is located in the first position area, at least part of the locking portion 413 is limited in the limiting groove to lock the nail push rod 12 .

In an embodiment, the resisting portion 123 is disposed at the proximal end of the push rod 12 and extends in a lateral direction, and the locking portion 413 extends from the main body portion 411 toward the proximal end, so as to Match with the resisting portion 123 . Of course, it is not limited to this, and it can be understood that, as long as the abutting portion 123 and the locking portion 413 are configured to be able to lock the nail push rod 12 when the safety block 41 is located in the first position area, limit any The push rod 12 can be moved to the distal end.

It can be understood that, in this embodiment, the abutting portion 123 may be a part of the protruding portion 121 to simplify the structure of the nail push rod 12. In this case, the protruding portion 121 (the abutting portion 123) In the embodiment provided at the proximal end of the push rod body 122, the push rod 12 is T-shaped in the direction from the proximal end to the distal end.

When the safety block 41 is located in the second position area, the firing mechanism is unlocked, and the push 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 push rod 12, nor on the rotation path of the firing handle 13, so that the The firing handle 13 can be rotated to drive the push rod 12 to move from the initial position to the firing position, thereby completing the firing of the medical stapler 100 .

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 only when the safety block 41 moves The firing mechanism is only in the unlocked state when it is in the second position area.

Further, the casing 11 is provided with a first limiting portion, the main body portion 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 moves in the lateral direction of the stapler body 1 , so that the unlocking member 42 can drive the safety block 41 to move between the first position area and the second position area in the lateral direction. In this embodiment, the first limiting portion and the second limiting portion include a sliding groove 111 and a sliding block 415 that cooperate with each other. The sliding groove 111 extends along the lateral direction of the housing 11. Of course, the Not limited to this.

In this embodiment, the slider 415 is provided on the main body portion 411 , and the sliding slot 111 is provided on the housing 11 . Of course, it is not limited to this. For example, the sliding block 415 may also be provided on the housing 11 , and in this case, the sliding groove 111 is provided on the main body portion 411 .

In a specific embodiment, the sliding grooves 111 are provided at opposite positions of the two sub-shells, and the sliding blocks 415 are provided on opposite sides of the main body 411, so that the The opposite sides of the safety block 41 are both slidably connected in the corresponding sliding grooves 111 , which enhances the movement stability of the safety block 41 . Of course, it is not limited to this. In other embodiments, the sliding slot 111 may be provided on only one of the sub-shells, as long as the safety block 41 can be guided in the lateral direction in the first position area with the You can move between the second location areas.

In a preferred embodiment of the present invention, the medical stapler 100 includes two of the safety mechanisms 4 , and the two safety mechanisms 4 are respectively disposed on opposite sides of the push rod 12 in the axial direction, and two of the safety mechanisms 4 The safety blocks 41 are in one-to-one correspondence with the two firing handles 13 , and the two safety mechanisms are integrally provided 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 insurance institutions 4 is not limited to the above two, and can be set according to specific conditions.

It can be understood that, in the embodiment in which the medical stapler 100 includes the two safety mechanisms 4 provided integrally, the housing 11 is provided with two safety blocks 41 that are respectively matched with the two safety blocks 41 . The sliding grooves 111 and the two sliding grooves 111 are symmetrically arranged on opposite sides of the nail pushing rod 12 .

Further, the first limiting portion and the second limiting portion further include a first stop portion 112 and a second stop portion 416 that cooperate with each other.

In an embodiment, the first stop portion 112 includes a first stop block 1121 disposed on the housing 11 and corresponding to the first position area, and the second stop portion 416 It includes a first limiting slot 4161 matched with the first limiting block 1121 , and the first limiting slot 4161 is provided on the main body portion 411 .

When the safety block 41 is located in the first position region, at least a part of the structure of the first limit block 1121 is located in the first limit groove 4161 . The safety block 41 moves along the axial direction of the stapler body 1. When the unlocking member 42 acts on the safety block 41, the safety block 41 can only move to the second position in the lateral direction. The first limit block 1121 cooperates with the first limit groove 4161, and can also guide the safety block 41 to move between the first position area and the second position area in the lateral direction; When the firing handle 13 is misoperated, when the pushing force applied to the push rod 12 is transmitted to the safety block 41, the safety block 41 cannot move in the distal direction, so that the safety block 41 and There is no mutual pushing force between the unlocking members 42, and the safety block 41 will not move to the second position area, that is, the safety block 41 is only driven by the unlocking member 42. It will leave the first position area to enhance the locking effect of the safety block 41 .

Specifically, the first limiting groove 4161 is concavely formed from the side of the main body portion 411 close to the nail push rod 12 to the side away from the nail push rod 12 . At this time, the main body portion 411 is U-shaped with side openings. Of course, it is not limited to this, the first limiting groove 4161 can also be a long groove extending in the lateral direction and closed at both ends, and the safety block 41 moves between the first position area and the second position area During the process, the first limiting block 1121 is always accommodated in the first limiting groove 4161 and moves along the first limiting groove 4161 .

Meanwhile, 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 , and the safety block 41 In the process of moving 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 The lateral movement of the stapler body 1 is controlled, and the safety block 41 is guided 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 at the second position, the first limiting block 1121 can also be disengaged from the first limiting groove 4161 .

Further, the first stop portion 112 further includes a second limit groove 1122 corresponding to the second position area, and the second stop portion 416 further includes a second limit groove 1122 corresponding to the second stop portion 416 . The matching second limit block 4162. The second limiting slot 1122 opens toward the main body portion 411 . When the safety block 41 is located in the second position area, at least part of the structure of the second limiting block 4162 is accommodated in the second limiting block 416 . in bit slot 1122.

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 from the first position area to the unlocking member 42 . The second position area moves, and when the anvil assembly 3 moves to the closed position, the safety block 41 is located in the second position area, and the firing mechanism is unlocked. When the anvil assembly 3 is in the closed position, the firing mechanism can fire the operation. At this time, the medical stapler 100 is in a fireable state, which can effectively prevent the doctor from performing operations when the anvil assembly 3 is not closed in place. The firing of staples and cutters leads to poor staple formation and even medical accidents. .

It can be understood that when the anvil assembly 3 is in the closed position, that is, the anvil assembly 3 is closed in place.

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

Further, the anvil assembly 3 further includes a protruding block 34 disposed on the outer periphery of the anvil shaft 32, and the unlocking member 42 is disposed at the proximal end of the protruding block 34, when the anvil assembly 3 moves toward the proximal end , the protruding block 34 acts against the unlocking member 42 to drive the unlocking member 42 to move toward the proximal end.

In a specific embodiment, the unlocking member 42 is sleeved on the anvil shaft 32 , and the protruding block 34 is annular so as to resist and act on the unlocking member 42 . However, it is not limited to this, and the protruding block 34 may not be annular. It is understood that the protruding block 34 only needs to be able to resist and act on the unlocking member 42 .

It can be understood that, in the embodiment in which the anvil shaft 32 has the anvil shaft body 321 and the screw rod 322 arranged in sections, the protrusions 34 may be provided on the outer circumference of the anvil shaft body 321, or may be provided on the anvil shaft body 321. the outer circumference of the screw rod 322 . As long as it is possible to drive the unlocking member 42 to move toward the proximal end during the process of moving the anvil assembly 3 toward the proximal end.

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 in the embodiment in which the protrusions 34 are provided on the outer circumference 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 to the proximal end, the The proximal end of the anvil shaft body 321 can abut on the unlocking member 42, and drive the unlocking member 42 to move toward the proximal end synchronously, so as to drive the safety block 41 from the first position area to the second position Area moves. Of course, it is not limited to this, and the protrusions 34 can also be provided at other axial positions of the anvil shaft body 321 , as long as the protrusions 34 can drive the anvil assembly 3 when the anvil assembly 3 moves in the proximal direction The unlocking member 42 can move in the proximal direction synchronously.

Further, the staple cartridge assembly 2 is provided with a guide groove 25 extending through the staple cartridge assembly 2 in the axial direction. The unlocking member 42 includes a connecting portion 421 located in the staple cartridge assembly 2 to cooperate with the protruding block 34, and a push rod 422 extending from the connecting portion 421 to the proximal end, the push rod 422 extending from the The inner side of the staple cartridge assembly 2 enters the housing 11 through the guide groove 25 and cooperates with the unlocking portion 412 , that is, the proximal end of the push rod 422 abuts against the unlocking portion 412 of the safety block 41 . Cooperate.

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

During the movement of the unlocking member 42 along the axial direction of the medical stapler 100 , the push rod 422 moves along the guide groove 25 to limit the movement direction of the unlocking member 42 .

In the embodiment in which the medical stapler 100 has two safety mechanisms 4 , the two unlocking members 42 share one connecting portion 421 , and the connecting portion 421 is sleeved on the anvil shaft 32 , And the two push rods 422 are connected to the opposite ends of the connecting portion 421. During the movement of the anvil assembly 3 from the open position to the closed position, the protrusions 34 act on the on the connecting portion 421 to drive the two push rods 422 to move toward the proximal end synchronously, and synchronously drive the corresponding safety block 41 to move toward 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 toward the proximal direction.

In this embodiment, the push rod 422 is detachably connected to the connecting portion 421 to facilitate the assembly of the unlocking member 42 . Of course, it is not limited to this, and the push rod 422 can also be fixedly connected with the connecting portion 421 .

Further, a guide structure 44 is provided between the safety block 41 and the unlocking member 42 to guide the relative movement of the unlocking member 42 and the safety block 41 .

In this embodiment, the above-mentioned guiding the relative movement of the unlocking member 42 and the safety block 41 includes that the unlocking member 42 is axially approached during the movement of the anvil assembly 3 from the open position to the closed position. When the anvil assembly 3 moves from the closed position to the open position, the safety block 41 moves laterally to the first position area. , so as to drive the unlocking member 42 to move in the axial direction toward the distal end. Of course, it is not limited to this.

Referring to the embodiment shown in FIG. 5 , 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 to the second position area in the lateral direction. Of course, it is not limited to this, and the guide structure can also be provided only on the push rod 422 or the unlocking portion 412, as long as the relative movement between the unlocking member 42 and the safety block 41 can be guided. Can.

In an embodiment, the first guide structure 441 is a first guide slope, and the second guide structure 442 is a second guide slope, that is, a guide is used between the unlocking portion 412 and the push rod 422 . The inclined surface is matched, the structure is relatively simple, and the fit is stable. Of course, it is not limited to this.

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

Specifically, the staple cartridge assembly 2 further includes a limiting barrel 24 disposed in the staple barrel 21. When the anvil assembly 3 moves between the open position and the closed position, the anvil assembly 3 moves along the The movement of the limiting cylinder 24 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.

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 moves away from the limiting cylinder 24 . The proximal end protrudes out and acts on the unlocking member 42 to push the unlocking member 42 to move toward the proximal end, so as to drive the safety block 41 to move from the first position area to the second position area.

Further, the anvil shaft body 321 is provided with a first fitting portion 3211, and the limiting cylinder 24 is provided with a second fitting portion 241. When the anvil assembly 3 moves to the closed position, the first fitting portion 3211 is formed. The portion 3211 cooperates with the second matching portion 241 to restrict the anvil assembly 3 from continuing to move in the proximal direction, preventing the closure from being too tight, and preventing the foreskin tissue from being over-pressed.

In this embodiment, the first matching portion 3211 is a stepped portion disposed 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 stepped portion abuts against the distal end surface of the limiting cylinder 24 to restrict the anvil assembly 3 from continuing to move in the proximal direction and prevent over-tightening of the closure. , so as not to overpress the foreskin tissue.

Of course, it is not limited to this, for example, the second matching portion 241 can also be provided 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 restrict the anvil assembly 3 from continuing to move in the proximal direction when the anvil assembly 3 moves to the closed position.

Further, 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 movement of the unlocking member 42 to the proximal end in the axial direction, enhancing the The stability of the unlocking member 42 .

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 bias for driving the safety block 41 to move from the second position area to the first position area force. After the pushing force exerted by the unlocking member 42 on 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, so as to lock the nail push rod 12 Therefore, when the glans anvil assembly 3 is not closed to the closed position, the push rod 12 is always in a state that cannot be fired, which can prevent medical staff from firing by mistake, resulting in poor staple forming and even medical accidents. occur.

In this embodiment, the elastic member 43 is located on the side of the safety block 41 away from the push rod 12 . It can be understood that at this time, the elastic connecting portion 414 is located at the main body 411 away from the pusher. One side of the shank 12. One end of the elastic member 43 is connected to the elastic connecting portion 414 , and the other end is connected to the second limiting groove 1122 . Of course, it is not limited to this.

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, so that when the nail push rod 12 is at the initial position and the anvil assembly 3 is at the open position When moving, the pressure exerted by the unlocking member 42 on 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 in the distal direction.

In a specific embodiment, the elastic member 43 is a compression spring connecting the safety block 41 and the housing 11 . Of course, the elastic member 43 is not limited to the compression spring, but can also be an elastic block or the like. structure, as long as the safety block 41 can be driven to switch from the second position area to the first position area.

Further, the main body portion 411 has a first marking portion 417 arranged at intervals in the lateral direction and a second marking portion 418 which is different from the first marking portion 417. The casing 11 is provided with a viewing port 113, and 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 . 113 is exposed, so that through the observation port 113, the 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 the medical staff from misjudging that the anvil assembly 3 is not closed. Misfired when in place, resulting in poor staple formation and even medical malpractice.

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

In the embodiment in which the sliding block 415 is provided on the main body part 411 , the first marking part 417 and the second marking part 418 can be provided on the sliding block 415 to simplify the safety block 41 Structure.

Compared with the prior art, in the medical stapler 100 of the present invention, by setting the 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 The staples and the cutter are fired when the anvil assembly 3 is not closed in place, resulting in poor staple formation and even medical accidents.

It should be understood that although this specification is described in terms of embodiments, not every embodiment only includes an independent technical solution, and this description in the specification is only for the sake of clarity, and those skilled in the art should take the specification as a whole, and each The technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

The series of detailed descriptions listed above are only specific descriptions for the feasible embodiments of the present invention, and they are not used to limit the protection scope of the present invention. Changes should all be included within the protection scope of the present invention.

Claims (15)

1. A medical stapler, comprising: a stapler body, comprising a casing and a firing mechanism cooperating with the casing; an anvil assembly movable in the axial direction of the stapler body; It is characterized in that, the medical stapler further comprises: a safety mechanism arranged between the firing mechanism and the anvil assembly, and the safety mechanism is provided with: a safety block, which is arranged in the housing and can move 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; The unlocking piece is arranged between the anvil assembly and the safety block. When the anvil assembly moves toward the proximal direction along the axial direction of the stapler body, the anvil assembly acts on the unlocking piece to make the anvil assembly move toward the proximal end. The unlocking member drives the safety block to move from the first position area to the second position area; The elastic piece is arranged between the housing and the safety block, and the elastic piece 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, wherein the anvil assembly comprises an anvil, an anvil shaft connected to the proximal end of the anvil, and a protruding block disposed on the outer periphery of the anvil shaft, The protrusion acts on the unlocking member to move the unlocking member towards the proximal end. 3. The medical stapler according to claim 2, wherein the unlocking member comprises a connecting portion sleeved on the anvil shaft, and a push rod extending from the connecting portion toward the proximal end, the The safety block is arranged at the proximal end of the push rod, and the bump acts on the connecting portion to drive the push rod to move toward the proximal end, and drive the safety block from the first position area to the second position area move. 4. The medical stapler according to claim 3, characterized in that: the medical stapler further comprises a staple cartridge assembly disposed at the distal end of the housing; the staple cartridge assembly is provided with an axially extending through the guide groove; the push rod is movably arranged in the guide groove. 5 . The medical stapler according to claim 3 , wherein the safety block has: a main body part movably connected in the housing; 5 . an unlocking portion extending from the main body portion to the distal end, the unlocking portion is matched with the push rod; A locking portion extending from the body portion toward the firing mechanism, the locking portion cooperating with the firing mechanism. 6 . The medical stapler according to claim 5 , wherein 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 guide structure adapted to the first guide structure. 7 . The second guide structure, the first guide structure cooperates with the second guide structure, so that the unlocking member can drive the safety block to move to the second position area in the lateral direction. 7. The medical stapler according to claim 6, wherein the first guide structure is a first guide slope, and the distance between the first guide slope and the shaft center 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. 8 . The medical stapler of claim 5 , wherein the firing mechanism comprises a nail push rod disposed in the housing, a firing handle pivotally connected to the housing, and the push nail The rod can move along the axial direction of the stapler body, the firing handle is located at the proximal end of the push rod, and the locking portion locks the push rod when the safety block is located in the first position area . 9 . The medical stapler according to claim 8 , wherein the push rod has a push rod body movably disposed on the anvil shaft, and a resisting portion disposed on the push rod body. 10 . , when the safety block is located in the first position area, the locking portion acts on the distal end of the abutting portion to restrict the push rod from moving in the distal direction. 10 . The medical stapler according to claim 5 , wherein the casing is provided with a first limiting portion, the main body portion is provided with a second limiting portion, and the first limiting portion is connected to the first limiting portion. 11 . The second limiting portion is matched to make the safety block move along the lateral direction of the stapler body. 11 . The medical stapler according to claim 10 , wherein one of the first limiting portion and the second limiting portion is a sliding groove, and the other is a sliding block. 12 . 12 . The medical stapler according to claim 1 , wherein the elastic member is a compression spring arranged between the safety block and the housing, and the compression spring is arranged when the safety block faces away from the safety block. 13 . one side of the shaft of the stapler body. 13 . The medical stapler according to claim 1 , wherein the safety block has first marking parts arranged at intervals along the transverse direction, and second marking parts different from the first marking parts, the safety block 13 . The casing is provided with an observation port, and when the safety block is located in the first position area, the first marking portion is exposed from the observation port; when the safety block is located in the second position area, the second mark The portion is exposed from the viewing port. 14. The medical stapler of claim 13, wherein the first marking portion is red, and the second marking portion is green. 15. The medical stapler of claim 1, wherein the medical stapler is a circumcision stapler.

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