WO2020135563A1 - Medical stapler - Google Patents

Abstract

A medical stapler (100), comprising a stapler body (1), a staple cartridge assembly (2), an anvil assembly (3), and a safety mechanism (4). The safety mechanism (4) is provided with a safety block (41) and an unlocking member (42); when the anvil assembly (3) moves towards the proximal end, the anvil assembly (3) acts on the unlocking member (42) to drive the safety block (41) to move from a first position area where a firing mechanism is locked to a second position area where the firing mechanism is unlocked. Firing when the anvil assembly (3) is not closed in place can be effectively prevented.

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 when performing surgical suture on digestive tract such as esophagus, intestine and foreskin tissue. The two sections of tissue are restrained during anastomosis, forming an annular anastomotic ring inside the tissue. The medical stapler can make the surgical process The resulting body bleeding is discharged with the contents, and the tissue is more likely to heal after the operation.

Existing medical staplers for treating the digestive tract, foreskin, etc. generally include an stapler body, a firing handle that is rotationally connected to the stapler body, and an anvil assembly provided at the distal end of the stapler body. The stapler body includes a casing, a nail cartridge assembly provided at the distal end of the casing to cooperate with the anvil assembly, and a nail pushing rod provided 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, a general surgeon judges whether a medical stapler has reached a fireable state based on his own feeling, and fires a staple and a cutter after the medical stapler reaches a fireable state.

However, on the one hand, the surgeon completely judges based on his own feelings and experience, which may easily lead to the inadequate closure of the anvil component and cause poor staple formation; on the other hand, some careless or inexperienced doctors will When closed in place, the staples and the cutter are accidentally fired, resulting in poor formation of the staples 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 object of the present invention is to provide a medical stapler.

In order to achieve the above object of the invention, the present invention adopts the following technical solution: A medical stapler, including:

The stapler body includes a casing and a firing mechanism arranged on the casing;

Anvil assembly, the anvil assembly can move along the axial direction of the stapler body;

An insurance mechanism is provided between the firing mechanism and the anvil assembly, and the insurance mechanism is provided with:

The safety block is provided in the housing, and can move between the first position area for locking the firing mechanism and the second position area for unlocking the firing mechanism along the lateral direction of the stapler body;

An unlocking member is provided between the anvil assembly and the safety block. When the anvil assembly moves in 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;

As a further improved technical solution of the present invention, the anvil assembly includes an anvil, an anvil shaft connected to a proximal end of the anvil, and a protrusion provided on the outer periphery of the anvil shaft, the protrusion acting on the anvil 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 proximally from the connecting portion, and the safety block is provided on the push rod At the proximal end of, the protrusion acts on the connecting portion, driving the push rod to move toward the proximal end, driving 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 provided at the distal end of the housing; the staple cartridge assembly is provided with a guide slot penetrating in the axial direction, and the push rod The activity is set 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 distally from the main body portion, the unlocking portion cooperating with the push rod; facing from the main body portion

A locking portion extending from 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, and the distal end of the unlocking portion is provided with a second guide structure adapted to the first guide structure, the first A guide structure cooperates with the second guide structure to enable the unlocking member to drive the safety block to move to the second position area in the lateral direction.

As a further improved technical solution of the present invention, the first guide structure is a first guide slope, and the distance from the first guide slope to the axis gradually increases from the proximal end to the distal end; the second guide structure is the first Two guide slopes, the distance from the second guide slope to the axis 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 provided in the housing, and when the safety block is located in the first position area, the locking portion locks the nail push rod.

As a further improved technical solution of the present invention, the nail push rod has a nail push rod body movably provided on the anvil shaft, a resisting portion provided on the nail push rod body, and the safety block is located at the first In a position area, the locking portion acts on the distal end of the resisting portion to restrict the movement of the push rod in the distal direction.

As a further improved technical solution of the present invention, the housing 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, In order to move the safety block in 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 slider.

As a further improved technical solution of the present invention, the insurance mechanism is further provided with an elastic member provided between the housing and the insurance block, the elastic member provides for driving the insurance block to move from the second position area to The biasing force of the first position area.

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

As a further improved technical solution of the present invention, the fuse block has a first marking portion arranged at intervals in the lateral direction and a second marking portion different from the first marking portion, and the housing is provided with an observation port, When the fuse block is in the first position area, the first marking portion is exposed from the observation port; when the fuse block is in the second position area, the second marking portion is exposed from the observation port.

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: the medical stapler of the present invention, by providing 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 If the staples and the cutter are fired without being in place, the staples are poorly formed, and even cause a medical accident.

BRIEF DESCRIPTION

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

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

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

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

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

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

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

detailed description

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

The words used to express the position and direction described in the present invention refer to the instrument operator, the end near 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 means The longitudinal direction of a component refers to the direction perpendicular to the axial direction. In addition, the terms first, second, etc. in the present invention are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

As shown in FIGS. 1 to 7, the present invention provides a medical stapler 100 for applying a plurality of staples to physiological tissues of a human body while cutting corresponding physiological tissues.

The medical stapler 100 in the embodiment of the present invention is a circular tube type stapler, which is specifically described by taking the circumcision stapler used for circumcision surgery as an example. The circumcision stapler is used to combine multiple staplers The nail is applied to the physiological tissue of the human body (referred to here 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 types of staplers, such as other round-tube staplers with double handles.

The medical stapler 100 includes a stapler body 1, an anvil assembly 3 that is 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 provided on the housing 11, a staple cartridge assembly 2 provided on the distal end of the housing 11, and a proximal end provided on the housing 11 The knob 15 is used to drive the anvil assembly 3 to move along the axial direction of the stapler body 1.

Preferably, the housing 11 is formed by joining two sub-housings.

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

When the medical stapler 100 is in a fireable state, medical personnel rotate the firing handle 13 to drive 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 push rod 12 is located at the initial position; after the firing mechanism/the medical stapler 100 is in the completed firing state, the push rod 12 Located at the firing position.

In this embodiment, the firing handle 13 includes a pivot portion pivotally connected to the housing 11, a pushing portion that bears against the push rod 12, and an operating portion for medical personnel to operate. When the firing handle 13 rotates, the pushing portion directly bears against the proximal end of the nail pushing rod 12 to drive the nail pushing rod 12 to move in the distal direction, so as to realize the firing of the medical stapler 100 . However, it is not limited to this, and a connecting member may be additionally provided to link the firing handle 13 and the nail push rod 12 to rotate the firing handle 13 to drive the nail push rod 12 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 a distal direction, the return spring 14 is gradually compressed. When the holding 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 return to the initial state; of course, It is not limited to this, for example, a reset member that drives the firing handle 13 to reset can be additionally provided, and when the holding force is canceled, the reset member drives the firing handle 13 to reset.

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

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

As shown in FIG. 3, the nail cartridge assembly 2 includes a nail barrel 21 provided at the distal end of the casing 11, a nail push piece 22 provided in the nail barrel 21, and a nail push piece provided in the nail barrel 21 The cutter on 22 and the nail magazine 23 provided at the distal end of the nail cylinder 21. The structure of each component in the staple cartridge assembly 2 and the cooperation relationship between them are all existing in the art, and will not be repeated here.

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

The anvil assembly 3 can move 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 passed through the stapler body 1, and the proximal end of the anvil shaft 32 Screwed 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 to drive the anvil 31 toward or away from the staple cartridge assembly Moving in the direction of 2, when the anvil assembly 3 is closed in place, the anvil 31 and the staple cartridge 23 clamp physiological tissue, which facilitates subsequent anastomotic cutting and can improve the anastomotic effect.

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

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 may be provided integrally with the anvil 31, of course, not limited to this .

It can be understood 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.

Please refer to FIGS. 4-7, the safety mechanism 4 is provided between the firing mechanism and the anvil assembly 3. The insurance mechanism 4 includes a safety block 41 provided 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 the first position area and the second position area along the lateral direction of the stapler body 1. In this embodiment, it is defined that the first position area is closer to the axis of the stapler body 1 than the second position area, that is, the first position area is closer to the second position area The nail push rod 12; of course, not limited to this.

When the safety block 41 is in the first position area, the 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 to prevent all The nail push rod 12 is 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.

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 provided on the body 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 43.

In this embodiment, when the safety block 41 is located in the first position area, the locking portion 413 locks the push rod 12 to restrict the distal movement of the push rod 12. It can be understood that at this time, Even if the firing handle 13 is held, since the safety block 41 restricts the movement of the nail pushing rod 12 in the distal direction, the firing handle 13 against the nail pushing 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 may also be configured to lock the firing handle 13 to restrict the firing handle 13 from rotating, thereby indirectly preventing the push pin Rod 12 is fired.

Please refer to the embodiments shown in FIGS. 3-7, the nail push rod 12 includes a nail push rod body 122 movably disposed on the anvil shaft 32, and an abutment connected to the nail push rod body 122 Portion 123, when the anvil assembly 3 is in the open position and the safety block 41 is in the first position area, the locking portion 413 abuts against the distal end of the resisting portion 123 to lock the The nail push rod 12 prevents the nail push rod 12 from moving to the firing position in the distal direction.

Of course, it can be understood that the locking manner by which the locking portion 413 locks the push rod 12 is not limited to this, for example, the locking portion 413 may be provided as a groove, and the safety block 41 is located at the first position In the area, at least part of the structure of the resisting portion 123 is received 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 structure of the locking portion 413 is limited to the limiting groove to lock the push rod 12.

In a specific embodiment, the resisting portion 123 is provided at the proximal end of the push rod 12 and extends in the lateral direction, and the locking portion 413 extends from the body portion 411 in the proximal direction to form Cooperate with the resisting portion 123. Of course, it is not limited to this. It can be understood that, as long as the resisting 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, it is restricted The push rod 12 can be moved to the distal end.

It can be understood that, in this embodiment, the resisting portion 123 may be a part of the convex portion 121 to simplify the structure of the push rod 12. At this time, the convex portion 121 (resisting portion 123) In the embodiment provided at the proximal end of the nail push rod body 122, the nail push rod 12 is T-shaped in a 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 nail 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 movement path of the push rod 12 nor on the rotation path of the firing handle 13, so that The firing handle 13 can be rotated to drive the nail push rod 12 to move from the initial position to the firing position to complete 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, only the safety block 41 When it is located in the second position area, the firing mechanism is in the unlocked state.

Further, a first limiting portion is provided on the casing 11, a second limiting portion is provided on the main body portion 411, the first limiting portion cooperates with the second limiting portion to guide The safety block 41 moves along 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 slider 415 that cooperate with each other. The sliding groove 111 extends laterally of the housing 11. Of course, Not limited to this.

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

In a specific embodiment, the sliding grooves 111 are provided at opposite positions on the two sub-housings, and the slider 415 is provided on opposite sides of the main body portion 411, so that the The opposite sides of the fuse block 41 are slidingly connected to the corresponding sliding grooves 111 to enhance the stability of the fuse block 41 to move. Of course, it is not limited to this. In other embodiments, the sliding groove 111 may be provided on only one of the sub-housings, as long as the fuse block 41 can be guided to the first position area along the lateral direction. Just 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, two of the safety mechanisms 4 are located on opposite sides of the push rod 12 in the axial direction, and two The safety block 41 corresponds to the two firing handles 13 one by one. 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 insurance institutions 4 is not limited to the above two, and can be set according to specific circumstances.

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

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

In a specific embodiment, the first stop portion 112 includes a first limit 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 groove 4161 that cooperates with the first limiting block 1121. The first limiting groove 4161 is provided on the main body 411.

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 location at the first position area is restricted The fuse block 41 moves along the axial direction of the stapler body 1. When the unlocking member 42 acts on the fuse block 41, the fuse block 41 can only move laterally to the second position area, and at the same time, The first limiting block 1121 cooperates with the first limiting slot 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 erroneously operated and the pushing force applied to the nail push rod 12 is transmitted to the fuse block 41, the fuse block 41 cannot move in the distal direction, so that the fuse block 41 There is no mutual pushing force between the unlocking pieces 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 piece 42 It will leave the first position area and enhance the locking effect of the safety block 41.

Specifically, the first limiting groove 4161 is formed by being recessed from the side of the main body portion 411 close to the push rod 12 toward the side away from the push rod 12, in this case, the main body section 411 is U-shaped with lateral opening. Of course, it is not limited to this. The first limiting groove 4161 may also be a long groove closed at both ends extending in the lateral direction, 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 contained in the first limiting slot 4161, and moves along the first limiting slot 4161.

At the same time, in this embodiment, when the fuse block 41 is located in the second position area, part of the structure of the first limiting block 1121 is still located in the first limiting slot 4161, the fuse block 41 During the movement between the first position area and the second position area, the first limit block 1121 always cooperates with the first limit slot 4161, so that the safety block 41 can only move along the The lateral movement of the stapler body 1 is described, 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 in the second position, the first limiting block 1121 may also be separated from the first limiting slot 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 phase opposite to the second limit groove 1122 Cooperate the second limit block 4162. The second limiting groove 1122 opens toward the main body portion 411, and 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 limit Inside the slot 1122.

During the proximal movement of the anvil assembly 3 from the open position, 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 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 to unlock the firing mechanism, so that by providing the safety mechanism 4, only Only when the anvil assembly 3 is in the closed position, the firing mechanism can perform the firing operation. At this time, the medical stapler 100 is in a fireable state, which can effectively prevent the doctor from performing when the anvil assembly 3 is not closed in place The firing of staples and knives leads to poor formation of staples 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 firable state means that the anvil assembly 3 is closed in place, so that the staple tissue 2 and the anvil 31 have the foreskin tissue to be cut already clamped in place, and the firing mechanism is in an unlocked state.

Further, the anvil assembly 3 further includes a protrusion 34 provided on the outer periphery of the anvil shaft 32, and the unlocking member 42 is provided on the proximal end of the protrusion 34 when the anvil assembly 3 moves toward the proximal end , The protrusion 34 resists the unlocking member 42 and drives the unlocking member 42 to move proximally.

In a specific embodiment, the unlocking member 42 is sleeved on the anvil shaft 32, and the protrusion 34 has a ring shape to resist the unlocking member 42. However, it is not limited to this, and the protrusion 34 may not be provided in a ring shape. It can be understood that the protrusion 34 only needs to be able to resist the unlocking member 42.

It can be understood that, in the embodiment where the anvil shaft 32 has the anvil shaft body 321 and the screw rod 322 arranged in sections, the protrusion 34 may be provided on the outer periphery of the anvil shaft body 321 or may be provided on The outer periphery of the screw 322. As long as the anvil assembly 3 is moved toward the proximal end, the unlocking member 42 can be driven to move 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 that in the embodiment where the protrusion 34 is provided on the outer periphery of the anvil shaft body 321 The protrusion 34 may be a part of the anvil shaft body 321. For example, the proximal end of the anvil shaft body 321 may be provided 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 bear against the unlocking member 42 and drive the unlocking member 42 to move in the proximal direction synchronously to drive the safety block 41 from the first position area to the second position Regional movement. Of course, not limited to this, the protrusion 34 may be provided at other parts of the anvil shaft body 321 in the axial direction, as long as the anvil assembly 3 moves in the proximal direction, the protrusion 34 can be driven The unlocking member 42 may move synchronously in the proximal direction.

Further, the nail magazine assembly 2 is provided with a guide groove 25 penetrating the nail magazine 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 protrusion 34, a push rod 422 extending proximally from the connecting portion 421, the push rod 422 The inside 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 resists 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 close to the axis of the staple cartridge assembly 2, more specifically, the nail pusher 22 is close to its axis Side. It can be understood that the guide groove 25 simultaneously penetrates the nail barrel 21 and the nail pushing piece 22 so that the push rod 422 can pass through the guide groove 25 from the inside of the nail 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 moving direction of the unlocking member 42.

In an embodiment where the medical stapler 100 has two safety mechanisms 4, the two unlocking members 42 share one connection portion 421, and the connection 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. During the movement of the anvil assembly 3 from the open position to the closed position, the protrusion 34 acts on the The connecting portion 421 drives the two push rods 422 to move in the proximal direction synchronously, and drives the corresponding safety block 41 to move to the second position area synchronously. 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.

In this embodiment, the push rod 422 and the connecting portion 421 are detachably connected to facilitate the assembly of the unlocking member 42. Of course, it is not limited to this, and the push rod 422 may be fixedly connected to 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 relative movement of the unlocking member 42 and the safety block 41 includes that during the movement of the anvil assembly 3 from the open position to the closed position, the unlocking member 42 approaches the axial direction Moving in the end direction, driving the fuse block 41 to move laterally to the second position area; and during the movement of the anvil assembly 3 from the closed position to the open position, the fuse block 41 moves laterally to the first position area To drive the unlocking member 42 to move in the distal direction in the axial direction. Of course, not limited to this.

In the embodiment shown in FIG. 5, the guide structure 44 includes a first guide structure 441 provided at the proximal end of the push rod 422 and a second guide structure 442 provided at the distal end of the unlocking portion 412. When the unlocking member 42 moves proximally, the first guide structure 441 and the second guide structure 442 cooperate to move the safety block 41 to the second position area in the lateral direction. Of course, not limited to this, the guide structure may 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 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, a guide is used between the unlocking portion 412 and the push rod 422 The inclined surface fits, the structure is relatively simple, and the fit is stable. Of course, not limited to this.

Specifically, the distance between the first guide slope and the second guide slope from the axis gradually increases from the proximal end to the distal end, and 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 limit cylinder 24 provided in the staple cartridge 21, and the anvil assembly 3 moves along when the anvil assembly 3 moves between the open position and the closed position 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 limit barrel 24. When the anvil assembly 3 moves from the open position to the closed position, the proximal end of the anvil shaft body 321 is removed from the limit barrel 24. The proximal end penetrates and acts on the unlocking member 42 to push the unlocking member 42 to move in the proximal direction to drive the safety block 41 to move from the first position area to the second position area.

Further, 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 a closed position, the first cooperation The portion 3211 cooperates with the second fitting portion 241 to restrict the anvil assembly 3 from continuing to move in the proximal direction, preventing the closure from being over-tightened, so as not to press the foreskin tissue excessively.

In this embodiment, the first engaging portion 3211 is a stepped portion provided at the distal end of the anvil shaft body 321, and the second engaging 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 restrict the anvil assembly 3 from continuing to move in the proximal direction to prevent over-tightening of the closure , So as not to over-press the foreskin tissue.

Of course, it is not limited to this. For example, the second fitting portion 241 may 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 engaging portion 3211 and the second engaging 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 bears against the proximal end of the limiting barrel 24 to restrict the unlocking member 42 from moving axially to the proximal end and strengthen The stability of the unlocking member 42.

The elastic member 43 is disposed between the housing 11 and the fuse block 41, and the elastic member 43 is used to provide an offset that drives the fuse block 41 to move from the second position area to the first position area force. After the thrust 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 to lock the 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 where it cannot be fired, which can prevent medical personnel from firing by mistake, resulting in poor formation of staples and even medical accidents. occur.

In this embodiment, the elastic member 43 is located on the side of the safety block 41 facing away from the push rod 12. Understandably, at this time, the elastic connecting part 414 is located away from the pushing part of the main body 411 One side of the nail rod 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, 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 gradually compresses, so that when the push rod 12 is in the initial position and the anvil assembly 3 is in the open position When moving, the pressure exerted by the unlocking member 42 on the safety block 41 gradually disappears, and 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 fuse block 41 and the housing 11. Of course, the elastic member 43 is not limited to the compression spring, but may also be a spring block, etc. The structure only needs to be able to drive the safety block 41 to switch from the second position area to the first position area.

Further, the main body portion 411 has a first marking portion 417 spaced along the lateral direction and a second marking portion 418 different from the first marking portion 417, and the casing 11 is provided with an observation port 113, When the fuse block 41 is in the first position, the first marking portion 417 is exposed from the observation port 113; when the fuse block 41 is in the second position, the second marking portion 418 is from the observation port 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 making a mistake, and the anvil assembly 3 is not closed Fired by mistake when in place, resulting in poorly formed staples and even medical accidents.

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 may be distinguished by other colors or other methods, such as patterns, etc. Part 417 and the second marking part 418.

In an embodiment in which the slider 415 is provided on the main body 411, the first marking part 417 and the second marking part 418 may be provided on the slider 415, simplifying the safety block 41 Structure.

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

It should be understood that although this specification is described according to embodiments, not every embodiment includes only an independent technical solution. This description of the specification is for clarity only, and those skilled in the art should treat the specification as a whole, each The technical solutions in the embodiments may also be combined appropriately 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 of feasible embodiments of the present invention, they are not intended to limit the scope of protection of the present invention, and equivalent embodiments or technical equivalents made without departing from the technical spirit of the present invention Changes should be included in the protection scope of the present invention.

Claims (15)

A medical stapler, including: The stapler body includes a casing and a firing mechanism arranged on the casing; Anvil assembly, the anvil assembly can move along the axial direction of the stapler body; It is characterized in that the medical stapler further includes: an insurance mechanism, which is arranged between the firing mechanism and the anvil assembly, and the insurance mechanism is provided with: The safety block is provided in the housing, and can move between the first position area for locking the firing mechanism and the second position area for unlocking the firing mechanism along the lateral direction of the stapler body; An unlocking member is provided between the anvil assembly and the safety block. When the anvil assembly moves in 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; . The medical stapler according to claim 1, wherein the anvil assembly includes an anvil, an anvil shaft connected to a proximal end of the anvil, and a protrusion provided on the outer periphery of the anvil shaft, The protrusion acts on the unlocking member to move the unlocking member toward the proximal end. The medical stapler according to claim 2, wherein the unlocking member includes a connecting portion sleeved on the anvil shaft, a push rod extending proximally from the connecting portion, and the safety block Located 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. The medical stapler according to claim 3, characterized in that the medical stapler further comprises a staple cartridge assembly provided at the distal end of the housing; the staple cartridge assembly is provided with a guide penetrating in the axial direction Groove; the push rod is movably arranged in the guide groove. The medical stapler according to claim 3, wherein the safety block has: Main body part movably connected in the housing; An unlocking portion extending distally from the main body portion, the unlocking portion cooperating with the push rod; A locking portion extending from the main body portion toward the firing mechanism, the locking portion cooperating with the firing mechanism. 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 second adapted to the first guide structure A guide structure, the first guide structure cooperates with the second guide structure to enable the unlocking member to drive the safety block to move to the second position area in the lateral direction. The medical stapler according to claim 6, wherein the first guide structure is a first guide slope, and the distance from the first guide slope to the axis gradually increases from the proximal end to the distal end; The second guide structure is a second guide slope, and the distance from the second guide slope to the axis gradually increases from the proximal end to the distal end. The medical stapler according to claim 5, wherein the firing mechanism includes a push rod provided in the housing, and when the safety block is located in the first position area, the locking portion locks the Push the nail rod. The medical stapler according to claim 8, wherein the nail push rod has a nail push rod body movably provided on the anvil shaft, and a resisting portion provided on the nail push rod body. When the safety block is located in the first position area, the locking portion acts on the distal end of the resisting portion to limit the movement of the push rod in the distal direction. The medical stapler according to claim 5, wherein the housing is provided with a first limiting portion, the main body portion is provided with a second limiting portion, the first limiting portion and the first The two limiting portions cooperate to move the safety block along the lateral direction of the stapler body. 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 slider. The medical stapler according to claim 1, characterized in that: the insurance mechanism is further provided with an elastic member provided between the housing and the insurance block, the elastic member is provided to drive the insurance block from The bias force of the second position area moving to the first position area. The medical stapler according to claim 12, wherein the elastic member is a compression spring provided between the fuse block and the housing, and the compression spring is provided on the fuse block away from the One side of the axis of the stapler body. The medical stapler according to claim 1, characterized in that the fuse block has a first marking portion spaced apart in the lateral direction, and a second marking portion different from the first marking portion, and the housing There is an observation port on the top, when the fuse block is in the first position area, the first marking portion is exposed from the observation port; when the fuse block is in the second position area, the second marking portion is The observation port is exposed. The medical stapler according to claim 1, wherein the medical stapler is a circumcision stapler.

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