CN219461268U - Surgical anastomat - Google Patents

Abstract

The present utility model provides a surgical stapler, the stapler comprising: a hollow shell, wherein a window is formed in the side wall of the shell; the firing piece is fixed in the shell; the nail bin is positioned at the proximal end side of the firing part, and a anastomotic nail is arranged in the nail bin; the nail anvil is positioned at the proximal end side of the nail bin; and when the driving assembly moves at least partially in the distal direction, the driving assembly drives the nail anvil to move in the distal direction until the driving assembly is matched with the nail bin, and the driving assembly drives the nail bin to move in the distal direction through the nail anvil so as to push out the anastomotic nail in the nail bin towards the nail anvil through the firing piece. The surgical stapler is simple in structure and convenient to use.

Description

Surgical anastomat

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a surgical anastomat.

Background

In surgical treatment, it is often necessary to suture some tissue within the body or to close a tissue opening. For example, in performing a surgical procedure, a portion of tissue is first stapled and then excised. As another example, fistula tracts may form in the human body for various reasons, which refers to pathological drainage ducts connected between the body and a luminal organ or between two luminal organs, due to abscesses. For example, anorectal fistulae are a common benign condition in the anorectal area, and often require a final surgeon to manually close the stoma when surgical treatment is desired. Some instruments for suturing tissue or treating tissue openings are known in the art, however, the construction of existing instruments tends to be relatively complex.

Disclosure of Invention

Aiming at the problems in the prior art, the utility model aims to provide a surgical anastomat with simple and effective structure.

An embodiment of the present utility model provides a surgical stapler including:

a hollow shell, wherein a window is formed in the side wall of the shell;

the firing piece is fixed in the shell;

the nail bin is positioned at the proximal end side of the firing part, and a anastomotic nail is arranged in the nail bin;

the nail anvil is positioned at the proximal end side of the nail bin;

and when the driving assembly moves at least partially in the distal direction, the driving assembly drives the nail anvil to move in the distal direction until the driving assembly is matched with the nail bin, and the driving assembly drives the nail bin to move in the distal direction through the nail anvil so as to push out the anastomotic nail in the nail bin towards the nail anvil through the firing piece.

In some embodiments, in an initial state, the anvil is positioned on a proximal side of the window, and the drive assembly drives the anvil to move to the distal side of the window as the anvil is moved in a distal direction.

In some embodiments, the proximal side of the firing member is provided with a staple pusher and a cutter that, in an initial state, at least partially enter the interior of the staple cartridge.

In some embodiments, a connecting piece extending along the axial direction of the anastomat is also fixed inside the shell, the firing piece, the nail bin and the nail anvil are sequentially arranged on the connecting piece, and the nail bin and the nail anvil can move along the axial direction relative to the connecting piece.

In some embodiments, the proximal end of the housing is provided with a proximal opening and the connector is removably secured to the interior of the housing.

In some embodiments, the drive assembly includes a drive member and a movable handle pivotally connected to a proximal end of the drive member, the movable handle being located on a proximal side of the housing and rotatable relative to the housing;

when the movable handle rotates relative to the shell in a first direction, the driving piece is driven to move towards the distal end side, and the driving piece drives the nail anvil to move towards the distal end side.

In some embodiments, the anvil includes an anvil body and a rack portion on a proximal side of the anvil body, the first surface of the driver being provided with at least one drive tooth that engages the rack portion.

In some embodiments, a second surface of the driving member is provided with a resilient member that imparts a biasing force to the driving teeth toward the rack portion, the second surface of the driving member being opposite the first surface.

In some embodiments, upon rotational repositioning of the movable handle in a second direction, the movable handle drives the drive member in a proximal direction, and the drive teeth are separated from the rack portion.

In some embodiments, the distal end face of each tooth of the rack is a sloped first guide face and/or the proximal end face of the drive tooth is a sloped second guide face.

In some embodiments, the proximal face of each tooth of the rack is a vertical face and/or the distal face of the drive tooth is a vertical face.

In some embodiments, a stationary handle is also included, the stationary handle being at least partially on a distal side of the movable handle, the movable handle being pivotally connected to the housing or the stationary handle.

In some embodiments, one end of the fixed handle is connected to the proximal end of the connector, or one end of the fixed handle is fixed to the proximal end of the housing.

In some embodiments, a first mating portion and a first biasing member are disposed on a side of the fixed handle facing the movable handle, the first biasing member providing a biasing force to the first mating portion that causes it to protrude from a surface of the fixed handle, and/or a second mating portion and a second biasing member are disposed on a side of the movable handle facing the fixed handle, the second biasing member providing a biasing force to the second mating portion that causes it to protrude from a surface of the movable handle;

when the movable handle rotates along the first direction, the movable handle moves towards the fixed handle, the first matching part retracts towards the inner side of the fixed handle, and/or the second matching part retracts towards the inner side of the movable handle.

In some embodiments, a third mating portion and a third biasing member are disposed on a side of the housing facing the movable handle, the third biasing member providing a biasing force to the third mating portion that causes it to protrude from a surface of the housing, and/or a fourth mating portion and a fourth biasing member are disposed on a side of the movable handle facing the housing, the fourth biasing member providing a biasing force to the fourth mating portion that causes it to protrude from a surface of the movable handle;

when the movable handle rotates along the first direction, the movable handle moves towards the shell, the third matching part retracts towards the inner side of the shell, and/or the fourth matching part retracts towards the inner side of the movable handle.

In some embodiments, the proximal end of the staple cartridge is provided with two axially extending stops that are connected to the lateral ends of the staple cartridge, respectively, or the distal end of the anvil is provided with two axially extending stops that are connected to the lateral ends of the anvil, respectively.

In some embodiments, the inner side of each of the stops is provided with an axially extending groove.

In some embodiments, the nail anvil is provided with a stop portion, the driving member is provided with a clamping portion, the clamping portion is located at the distal end side of the stop portion, and after the driving member moves towards the proximal end side direction until the clamping portion abuts against the stop portion, the driving member can drive the nail anvil to move towards the proximal end side direction.

In some embodiments, the driver is fixedly attached to the anvil by a fastener or the driver is directly fixedly attached to the anvil.

The surgical anastomat provided by the utility model has the following advantages:

in the surgical stapler, the firing member, the nail bin and the nail anvil are sequentially arranged in the shell from the far end side to the near end side, when the stapler is fired, the nail anvil is driven to move towards the far end side through the driving component, the nail anvil and the nail bin are closed firstly, and then the nail anvil and the nail bin can be driven to move towards the far end side through the driving component, so that the firing member pushes out the anastomat in the nail bin towards the nail anvil to complete the firing of the stapler.

Drawings

Other features, objects and advantages of the present utility model will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the following drawings.

FIG. 1 is a schematic view of a surgical stapler according to a first embodiment of the utility model;

FIG. 2 is an exploded view of a surgical stapler of a first embodiment of the present utility model;

fig. 3 is a schematic structural view of a housing according to a first embodiment of the present utility model;

FIG. 4 is a schematic view of the firing structure of the first embodiment of the present utility model;

FIG. 5 is a front view of a firing mechanism of the first embodiment of the present utility model;

FIG. 6 is a schematic illustration of the firing member and cartridge cooperation of a first embodiment of the present utility model;

FIGS. 7 and 8 are schematic views of the anvil and driver cooperation of a first embodiment of the present utility model;

FIG. 9 is a cross-sectional view of the movable handle and the fixed handle of the first embodiment of the present utility model mated;

FIG. 10 is a schematic view of a surgical stapler with a movable handle held in accordance with a first embodiment of the present utility model;

FIG. 11 is a front view of a firing mechanism when closed, according to a first embodiment of the present utility model;

FIG. 12 is a schematic view of the structure of the firing mechanism upon closure of the first embodiment of the present utility model;

FIG. 13 is a schematic view of a firing structure upon firing of the first embodiment of the present utility model;

fig. 14 is a schematic view of a surgical stapler according to a second embodiment of the utility model;

fig. 15 is a schematic view of a surgical stapler according to a third embodiment of the present utility model;

FIG. 16 is a schematic view of a surgical stapler with a third embodiment of the present utility model having a housing removed;

FIG. 17 is a schematic view of a firing mechanism according to a third embodiment of the present utility model;

FIG. 18 is a schematic view of a surgical stapler with a movable handle held in accordance with a third embodiment of the present utility model;

FIG. 19 is a schematic view of a fixed handle mated with a connector in accordance with a third embodiment of the present utility model;

FIG. 20 is a schematic view of the anvil and driver cooperation of a third embodiment of the present utility model.

Reference numerals:

1. shell 4 percussion part

11. Window 41 nail pushing sheet

12. Third matching part 42 cutter

13. First pivot connection 5 cartridge

14. Distal opening 51 nail hole

15. Proximal opening 52 feed slot

2. Fixed handle 53 stop

21. First fitting portion 531 groove

22. First holding groove 6 nail anvil

23. First spring 61 nail anvil body

24. Fifth pivot joint 62 rack portion

25. Distal end surfaces of teeth of the sleeve 621

3. Proximal end face of movable handle 622 teeth

31. First end 623 stop

311. Second pivot connection 7 drive

312. Third pivot connection 71 fourth pivot connection

32. Second end 72 drive teeth

33. Second fitting part 73 spring plate

34. Second accommodation groove 74 holding part

35. Second spring 8 connector

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus a repetitive description thereof will be omitted. "or", "or" in the specification may each mean "and" or ". Although the terms "upper", "lower", "between", etc. may be used in this specification to describe various exemplary features and elements of the utility model, these terms are used herein for convenience only, e.g., in terms of the orientation of the examples depicted in the drawings. Nothing in this specification should be construed as requiring a particular three-dimensional orientation of the structure in order to fall within the scope of the utility model. Although the terms "first," "second," "third," "fourth," or "fifth" may be used herein to describe certain features, these features should be interpreted as merely illustrative and as a limitation on the number and importance of the particular features.

The utility model provides a surgical anastomat with a simple and effective structure, which comprises a hollow shell, a driving assembly, and a firing part, a nail bin and a nail anvil which are sequentially arranged in the shell from the far end side to the near end side. The side wall of the shell is provided with a window. The firing member is secured within the housing. The inside of nail storehouse is provided with the anastomat. During operation, the surgical anastomat is firstly placed at a lesion position, and tissues to be anastomosed are pulled into the shell through the window of the side wall, so that the tissues are positioned between the nail anvil and the nail bin. The driving assembly is driven to move at least partially in the distal direction, and the driving assembly firstly drives the nail anvil to move in the distal direction until the nail anvil is matched with the nail cartridge, so that tissues are clamped between the nail cartridge and the nail anvil, and the nail cartridge and the nail anvil are closed. And then continuously driving the driving assembly to move at least partially in the distal direction, and driving the staple cartridge to move in the distal direction through the staple anvil by the driving assembly so as to push out staples in the staple cartridge towards the staple anvil through the firing member, thereby completing the firing of the stapler. The surgical anastomat can complete the closing and firing of the anastomat through a set of driving structure (a driving assembly, a nail anvil, a nail bin and a firing part), simplifies the structure of the anastomat and is more convenient to use.

The structure of the surgical stapling instrument according to various embodiments of the present utility model will be described in detail with reference to the accompanying drawings, with the understanding that the various embodiments are not intended as limitations on the scope of the utility model.

As shown in fig. 1 to 8, a first embodiment of the present utility model provides a surgical stapler having a simple and effective structure, which includes a hollow housing 1, and a firing member 4, a cartridge 5, an anvil 6, and a driving assembly sequentially disposed inside the housing 1 from a distal end side to a proximal end side. Two connecting pieces 8 extending along the axial direction are fixed in the shell 1, and the two connecting pieces 8 are symmetrically arranged relative to the axis of the anastomat. The firing member 4, the staple cartridge 5 and the anvil 6 are sequentially sleeved at the two transverse ends of the connecting member 8, wherein the firing member 4 is fixed at the distal end of the connecting member 8 and cannot axially move, and the staple cartridge 5 and the anvil 6 can axially move by taking the connecting member 8 as a guide rail. In other embodiments, the connecting pieces 8 may be detachably fixed to the inside of the housing 1, and the number of the connecting pieces 8 is not limited to 2, but may be 1 or other numbers. The connector 8 is illustratively separated from the housing 1 in fig. 4 to more clearly illustrate the mating of the connector 8 with other structures.

In the present utility model, the distal end side and the proximal end side are the proximal end side with respect to the operator, and the end closer to the operator, that is, the end closer to the surgical site is the distal end side. The S1 direction in fig. 1 is the proximal-to-distal direction. The direction S1 or the direction opposite to the direction S1 is defined as the axial direction of the anastomat, the direction S2 is defined as the longitudinal direction of the anastomat, and the direction S3 perpendicular to the direction S1 and the direction S2 is defined as the transverse direction of the anastomat. In the present utility model, the inner side and the outer side of a member are the inner side with respect to the axis of the member, and the outer side with respect to the axis.

As shown in fig. 1 to 3, the housing 1 has a tubular or nearly tubular shape, and a window 11 is formed in a side wall of the housing 1. In the initial state, the nail anvil 6 is positioned at the proximal end side of the window 11, and the nail bin 5 is positioned at the distal end side of the window 11, so that in the anastomotic process of the alimentary canal tissue, the anastomat is attached to the natural growth form of the tissue, the window 11 is attached to the tissue to be anastomosed, the tissue to be anastomosed is more easily pulled into the window 11 positioned at the side wall of the shell 1, the anastomosed tissue is more similar to the natural form of the human tissue, and discomfort such as foreign body feeling after operation can not be caused. As shown in fig. 2, the distal end of the anastomat is provided with a distal end opening 14, and the distal end opening 14 prevents a closed space from being formed between the distal end of the anastomat and the tissue cavity when the anastomat is placed into the tissue, thereby preventing the influence of normally secreted gas liquid and contents in the digestive tract. As shown in fig. 3, the proximal end of the stapler is provided with a proximal opening 15, through which proximal opening 15 the operator can observe the interior of the housing 1.

As shown in fig. 4 to 6, the trigger 4 is fixed to the inside of the housing 1 by the connector 8, and a nail pushing plate 41 and a cutter 42 are provided on the proximal end side of the trigger 4. The inside of nail storehouse 5 is provided with the staple, the proximal end face of nail storehouse 5 is provided with a plurality of nail holes 51 and feed groove 52. In an initial state, the staple pushing plate 41 and the cutter 42 of the firing member 4 at least partially enter the interior of the staple cartridge 5 from the distal end of the staple cartridge 5. When the stapler is fired, the staple cartridge 5 moves in the distal direction, so that the staple pusher 41 and the cutter 42 of the firing member 4 further enter the inside of the staple cartridge 5, and the staples and the cutter 42 are pushed out toward the anvil 6.

As shown in fig. 6, the proximal end of the cartridge 5 is provided with two stoppers 53, the two stoppers 53 are respectively connected to both lateral ends of the cartridge 5, and the two stoppers 53 extend from the proximal end surface of the cartridge 5 in the proximal axial direction of the stapler, so that when the stapler is closed, the tissue can be confined between the two stoppers 53, and the two stoppers 53 prevent the tissue from overflowing. The two stops 53 are located inside the two connectors 8, respectively. In another embodiment, two stoppers may be disposed at the distal end of the anvil 6, and the two stoppers are respectively connected to two lateral ends of the anvil 6, and extend from the distal end surface of the anvil 6 in the axial distal direction, so that the tissue spill prevention can be achieved. Further, the inner side of each of the stoppers 53 is provided with a groove 531 extending in the axial direction to enhance the clamping effect on the tissue.

As shown in fig. 4 to 7, the drive assembly includes a drive member 7 and a movable handle 3, the movable handle 3 being located on the proximal side of the housing 1. The proximal end of the housing is provided with a first pivot connection 13, the first end 31 of the movable handle 3 is provided with a second pivot connection 311 and a third pivot connection 312, and the proximal end of the driving member 7 comprises a fourth pivot connection 71. The second pivot connection 311 of the movable handle 3 is pivotally connected to the first pivot connection 13 of the housing 1 and the movable handle 3 is detachably connected to the housing 1, the movable handle 3 being detachable from the proximal end of the housing 1 when required. The second end 32 of the movable handle 3 is a holding end for an operator to hold. The proximal end of the housing 1 is further provided with a fixed handle 2, the fixed handle 2 is located at the distal end side of the movable handle 3, and the fixed handle 2 and the housing 1 are integrally formed or one end of the fixed handle 2 is fixed to the housing 1. When the movable handle 3 is gripped, the movable handle 3 is rotated in the first direction to approach the fixed handle 2, and the third pivot coupling portion 312 drives the fourth pivot coupling portion 71 so that the driving member 7 moves in the distal direction. In the view of fig. 1, the first direction is clockwise. The second direction opposite to the first direction is a counterclockwise direction.

As shown in fig. 7 and 8, the anvil 6 includes an anvil body 61 and a rack portion 62, the rack portion 62 is located at a proximal end side of the anvil body 61, a distal end surface of the anvil 6 is a anvil surface opposite to the staple cartridge 5, and a surface of the rack portion 62 facing the driver 7 is provided with a tooth surface. The first surface of the driver 7 facing the anvil 6 is provided with at least one driving tooth 72, which driving tooth 72 engages with the rack portion 62. When the driver 7 moves in the distal direction, the driving teeth 72 mesh with the teeth of the rack portion 62, and thereby the rack portion 62 is driven to move in the distal direction. As shown in fig. 7 and 8, the proximal face 622 of each tooth of the rack portion 62 is a vertical face, and the distal face of the drive tooth 72 is a vertical face, improving the stability of the mating of the drive tooth 72 and the rack portion 62 upon firing of the stapler and better transmitting the driving force to the rack portion 62. The distal end face 621 of each tooth of the rack portion 62 is a first inclined guide face, and the proximal end face of the drive tooth 72 is a second inclined guide face. When the movable handle 3 is rotated in the second direction for resetting, the movable handle 3 drives the driving member 7 to move in the proximal direction, and the driving teeth 72 are separated from the rack portion 62 by the guiding action of the first guiding surface and the second guiding surface, so that the anvil 6 can be kept stationary.

Further, as shown in fig. 7 and 8, the second surface of the driving member 7 is provided with an elastic member that biases the driving teeth 72 toward the rack portion 62, the second surface of the driving member 7 being opposite to the first surface, and in the view of fig. 7 and 8, the first surface of the driving member 7 is a lower surface and the second surface is an upper surface. The elastic piece can keep the driving teeth 72 and the rack part 62 in the engaged state all the time in the firing process, so that the driving teeth and the rack part are not easy to be disengaged. In this embodiment, the elastic member is a spring plate 73, two ends of the spring plate 73 are fixed to the second surface of the driving member 7, and an elastic portion of the spring plate 73 abuts against the inner wall of the housing 1. However, the present utility model is not limited thereto, and in other alternative embodiments, the elastic member may be a spring, an elastic pad, or other elastic structures.

As shown in fig. 9, a first engaging portion 21 and a first biasing member are provided on a side of the fixed handle 2 facing the movable handle 3, the first biasing member biasing the first engaging portion 21 to protrude from a surface of the fixed handle 2. The fixed handle 2 is provided with a first accommodating groove 22 for accommodating the first engaging portion 21 which is forced to retract inward. The movable handle 3 is provided with a second mating portion 33 and a second biasing member on a side facing the fixed handle 2, the second biasing member biasing the second mating portion 33 to protrude from the surface of the movable handle 3. The movable handle 3 is provided with a second receiving groove 34 for receiving the second engaging portion 33 which is forced to retract inward. In this embodiment, the first biasing member is a first spring 23 disposed in the first receiving groove, and the second biasing member is a second spring 35 disposed in the second receiving groove 34, but the present utility model is not limited thereto. The first biasing member and the second biasing member may also be other elastic structures such as a spring plate, an elastic pad, and the like.

In the initial state, under the action of the first spring 23, the first engaging portion 21 protrudes at least partially from the proximal side of the fixed handle 2, under the action of the second spring 35, the second engaging portion 33 protrudes at least partially from the distal side of the movable handle 3, and the first engaging portion 21 and the second engaging portion 33 abut against each other, so that the initial position of the movable handle 3 can be defined. When the movable handle 3 is held to rotate in the first direction, the movable handle 3 moves toward the fixed handle 2, the first engaging portion 21 and the second engaging portion 33 interact such that the first engaging portion 21 is retracted into the first accommodating groove 22 toward the inside of the fixed handle 2, the first spring 23 is elastically deformed, the second engaging portion 33 is retracted into the second accommodating groove 34 toward the inside of the movable handle 3, and the second spring 35 is elastically deformed. After the movable handle 3 is released, the first engaging portion 21 and the second engaging portion 33 move outwards under the action of elastic deformation restoring force of the first spring 23 and the second spring 35, and the movable handle 3 rotates in the second direction and returns to the initial position under the abutting action of the first engaging portion 21 and the second engaging portion 33, so that the movable handle 3 is reset.

In another embodiment, only the first engaging portion 21 may be provided, and the second engaging portion 33 may not be provided, and in the initial state, the first engaging portion 21 may abut against the distal end surface of the movable handle 3. When the movable handle 3 is held, the movable handle 3 acts on the first matching part 21, so that the first matching part 21 is retracted inwards, and after the movable handle 3 is released, the movable handle 3 is reset through the outward abutting action of the first matching part 21. In still another embodiment, only the second engaging portion 33 may be provided, and the first engaging portion 21 may not be provided, and in the initial state, the second engaging portion 23 may abut against the proximal end surface of the fixed handle 2. When the movable handle 3 is held, the fixed handle 2 acts on the second matching part 33, so that the second matching part 33 is retracted inwards, and after the movable handle 3 is released, the movable handle 3 is reset through the outward abutting action of the second matching part 33.

In this embodiment, the anvil 6 has a first position and a second position, the second position being distal to the first position. The first and second positions are located on the proximal and distal sides of the window 11, respectively. Wherein the first position refers to the initial position of the anvil 6 and the second position refers to the anvil 6 being moved to a closed position clamping tissue with the cartridge 5. In the initial state, as shown in fig. 1-5, the anvil 6 is in a first position away from the staple cartridge 5. The cartridge 5 is located on the distal side of the window 11. The first engaging portion 21 protrudes from the proximal side surface of the fixed handle 2, and the second engaging portion 33 protrudes from the distal side surface of the movable handle 3 and abuts against the first engaging portion 21. The movable handle 3 is in an initial position away from the fixed handle 2.

In operation, the surgical stapler is first placed in the lesion, and the tissue to be stapled is pulled into the housing 1 through the window 11 of the side wall, so that the tissue is located between the anvil 6 and the cartridge 5. At this time, the movable handle 3 is held so that the movable handle 3 rotates in the first direction. As shown in fig. 10, the second engaging portion 33 abuts against the first engaging portion 21, the first engaging portion 21 is retracted into the fixed handle 2, the second engaging portion 33 is retracted into the movable handle 3, at this time, the first engaging portion 21 is retracted into the first accommodating groove 22, and the second engaging portion 33 is retracted into the second accommodating groove 34. In this process, the movable handle 3 drives the driving member 7 to move in the distal direction, and the driving member 7 first drives the anvil 6 to move in the distal direction by one stroke. Then, the movable handle 3 is released, the movable handle 3 is restored to the initial position under the action of the first spring 23 and the second spring 35, the driving member 7 is driven to move in the proximal direction, the driving teeth 72 are separated from the rack portion 62 under the guiding action of the first guiding surface and the second guiding surface, and the anvil 6 is maintained at the current position. When the movable handle 3 is held again, the movable handle 3 drives the anvil 6 again to move in the distal direction by one stroke via the driving member 7. After a few strokes, the anvil 6 moves in the distal direction to a second position, i.e. as shown in fig. 11 and 12, the anvil 6 cooperates with the cartridge 5 to clamp tissue between the cartridge 5 and the anvil 6, completing the closing of the stapler. The cooperation of the anvil 6 and the cartridge 5 refers to a linkage state in which the anvil 6 and the cartridge 5 can drive the cartridge 5 to move in the distal direction when the anvil 6 moves in the distal direction after the anvil 6 and the cartridge 5 clamp tissue. The length of the stroke in which the movable handle 3 is gripped each time to drive the anvil 6 in motion is related to the number of grips required to close the stapler. For example, the distance between the first position and the second position is L0, the length of a single stroke in which the movable handle 3 is gripped and the anvil 6 is driven to move in the distal direction for each time is L1, and the number of times of gripping required to close the stapler is equal to L0/L1. When L1 is smaller than L0, the anastomat needs to be closed by multiple times of holding, when L1 is equal to L0, the anastomat can be closed by one time of holding, and when L1 is larger than L0, the closing of the anastomat can be completed when the movable handle 3 is not held to the bottom.

After the anastomat is closed, the movable handle 3 is held again or the movable handle 3 is held continuously, the movable handle 3 pushes the driving piece 7 to move towards the distal side, the driving piece 7 drives the nail bin 5 to move towards the distal side through the nail anvil 6, as shown in fig. 13, as the firing piece 4 is fixed, the nail pushing piece 41 and the cutter 42 of the firing piece 4 further enter the inside of the nail bin 5 so as to push out the anastomat in the nail bin 5 towards the nail anvil 6 through the nail pushing piece 41, suture on tissues and form on the nail anvil surface of the nail anvil 6, and the cutter 42 penetrates out of the cutter groove 52 of the nail bin 5 to reach the nail anvil surface of the nail anvil 6 to cut tissues, thereby completing the firing of the anastomat. Therefore, the surgical anastomat can complete the closing and firing of the anastomat through a set of driving structure, simplifies the structure of the anastomat and is more convenient to use.

Fig. 14 is a schematic view showing a structure of a surgical stapler according to a second embodiment of the present utility model. This embodiment differs from the first embodiment in that the second pivot connection 311 of the movable handle 3 is non-detachably connected to the first pivot connection 13 of the housing 1. A third fitting portion 12 and a third biasing member are provided on a side of the housing 1 facing the movable handle 3, the third biasing member biasing the third fitting portion 12 to a biasing force protruding from a proximal side surface of the housing 1, and a third receiving groove (not shown) is provided on a side of the housing 1 facing the movable handle 3. In the initial state, the third engaging portion 12 protrudes from the proximal end side surface of the housing 1 and abuts against the distal end surface of the movable handle 3. When the movable handle 3 is held, the movable handle 3 moves towards the shell 1, and the movable handle 3 presses the third matching part 12, so that the third matching part 12 enters the third accommodating groove, and the third biasing member is driven to deform. After the movable handle 3 is released, under the action of the deformation restoring force of the third biasing member, the third matching part 12 is driven to protrude out of the proximal side surface of the shell 1 again, and the movable handle 3 is driven to rotate and reset along the second direction. The third biasing member may be a spring, a spring plate, an elastic pad, etc. disposed in the third accommodating groove.

In another embodiment, a fourth mating portion and a fourth biasing member may also be provided on a side of the movable handle 3 facing the housing 1, and a fourth receiving groove for receiving the fourth mating portion may be provided on a side of the movable handle 3 facing the housing 1. The fourth biasing member gives the fourth fitting portion a biasing force that makes it protrude from the distal end side surface of the movable handle 3. In the initial state, the fourth engaging portion protrudes from the distal end side surface of the movable handle 3 to abut against the third engaging portion 12. When holding the movable handle 3, the movable handle 3 rotates in the first direction, the movable handle 3 moves toward the housing 1, the third engaging portion 12 retracts toward the inside of the housing 1, and the fourth engaging portion retracts toward the inside of the movable handle 3. After the movable handle 3 is released, the movable handle 3 is driven to rotate and reset along the second direction under the action of the deformation restoring force of the third biasing member and the fourth biasing member. The fourth biasing member may be a spring, a spring plate, an elastic pad, etc. disposed in the fourth accommodating groove.

Fig. 15 to 20 are schematic structural views of a surgical stapler according to a third embodiment of the present utility model. This embodiment differs from the first embodiment in that one end of the fixed handle 2 is not fixed to the housing 1, but is sleeved on the proximal end of the connecting member 8 by the sleeved portion 25, and the connecting member 8 is detachably connected to the housing 1, and the second pivot connection portion 311 of the movable handle 3 is pivotally connected to the fifth pivot connection portion 24 of the fixed handle 2. With this construction, the connector 8, firing member 4, cartridge 5, anvil 6, fixed handle 2, and movable handle 3 can be separated from the housing 1 together through the proximal opening 15 of the housing 1. When in use, the connecting piece 8, the firing piece 4, the nail bin 5, the nail anvil 6, the fixed handle 2 and the movable handle 3 can be taken out of the shell 1 integrally, so that more space is reserved for convenient operation of doctors. And also to facilitate replacement of some or all of the components therein after surgery.

As shown in fig. 20, a retraction mechanism of the anvil 6 is also added to this third embodiment. Specifically, the anvil 6 is provided with a stop portion 623, the stop portion 623 is disposed on the proximal end side of the rack portion 62, the driver 7 is provided with a holding portion 74, the holding portion 74 is disposed on the distal end side of the driver 7, and the holding portion 74 is disposed on the distal end side of the stop portion 623. After the firing of the anastomat is completed, the driving piece 7 is driven to move towards the proximal direction, so that the driving piece 7 moves until the clamping part 74 abuts against the stopping part 623, and the driving piece 7 can drive the anvil 6 to move towards the proximal direction, thereby realizing the separation of the anvil 6 and the staple cartridge 5.

In each of the above embodiments, the driving member and the anvil are matched through the driving teeth and the rack portion, so that the driving member drives the anvil. In another embodiment, the driving member may be fixedly connected to the anvil, for example, by clamping, or the driving member may be directly and fixedly connected to the anvil, so that when the driving member is driven to move in a distal direction while holding the movable handle to rotate in the first direction, the driving member directly drives the anvil to move in the distal direction until the anvil and the staple cartridge clamp tissue, and then the movable handle is continuously held, and the driving member continuously drives the anvil and the staple cartridge to move in the distal direction, thereby firing the stapler.

The structures of the components of the above embodiments may be combined with each other to obtain a new embodiment, which is also within the scope of the present utility model. For example, the stopper and the catch of the third embodiment can be applied to the first embodiment or the second embodiment as well. The movable handle of the first embodiment may also be a non-detachable pivotal connection with the housing. The fixed handles of the first and second embodiments may also employ the structure of the fixed handle of the third embodiment. The connector in each embodiment may be configured to be removably or non-removably secured to the housing.

The foregoing is a further detailed description of the utility model in connection with the preferred embodiments, and it is not intended that the utility model be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the utility model, and these should be considered to be within the scope of the utility model.

Claims (19)

1. A surgical stapler, for use with a surgical stapler, the surgical stapler comprising:

a hollow shell, wherein a window is formed in the side wall of the shell;

the firing piece is fixed in the shell;

the nail bin is positioned at the proximal end side of the firing part, and a anastomotic nail is arranged in the nail bin;

the nail anvil is positioned at the proximal end side of the nail bin;

and when the driving assembly moves at least partially in the distal direction, the driving assembly drives the nail anvil to move in the distal direction until the driving assembly is matched with the nail bin, and the driving assembly drives the nail bin to move in the distal direction through the nail anvil so as to push out the anastomotic nail in the nail bin towards the nail anvil through the firing piece.

2. The surgical stapler of claim 1, wherein in an initial state, the anvil is positioned on a proximal side of the window, and wherein the drive assembly drives the anvil to move to the distal side of the window as the anvil is moved in a distal direction.

3. The surgical stapler of claim 1, wherein a proximal side of the firing member is provided with a staple pusher and a cutter, the staple pusher and cutter at least partially entering the interior of the staple cartridge in an initial state.

4. The surgical stapler of claim 1, wherein a connector extending in an axial direction of the stapler is further secured within the housing, the firing member, the staple cartridge, and the anvil are sequentially disposed on the connector, and the staple cartridge and the anvil are movable in the axial direction relative to the connector.

5. The surgical stapler of claim 4, wherein the proximal end of the housing is provided with a proximal opening and the connector is removably secured to the interior of the housing.

6. The surgical stapler of claim 4, wherein the drive assembly includes a drive member and a movable handle pivotally connected to a proximal end of the drive member, the movable handle being located on a proximal side of the housing and rotatable relative to the housing;

when the movable handle rotates relative to the shell in a first direction, the driving piece is driven to move towards the distal end side, and the driving piece drives the nail anvil to move towards the distal end side.

7. The surgical stapler of claim 6, wherein the anvil comprises an anvil body and a rack portion, the rack portion being located on a proximal side of the anvil body, the first surface of the driver being provided with at least one drive tooth, the drive tooth being engaged with the rack portion.

8. The surgical stapler of claim 7, wherein a second surface of the drive member is provided with a resilient member that imparts a biasing force to the drive teeth toward the rack portion, the second surface of the drive member being opposite the first surface.

9. The surgical stapler of claim 7, wherein upon rotational repositioning of the movable handle in the second direction, the movable handle drives the drive member in a proximal direction and the drive teeth are disengaged from the rack portion.

10. The surgical stapler according to claim 9, wherein the distal end face of each tooth of the rack is a sloped first guide face and/or the proximal end face of the drive tooth is a sloped second guide face.

11. The surgical stapler of claim 7, wherein the proximal face of each tooth of the rack is a vertical face and/or the distal face of the drive tooth is a vertical face.

12. The surgical stapler of claim 6, further comprising a fixed handle at least partially located on a distal side of the movable handle, the movable handle pivotally connected to the housing or the fixed handle.

13. The surgical stapler of claim 12, wherein one end of the fixed handle is connected to the proximal end of the connector or one end of the fixed handle is fixed to the proximal end of the housing.

14. The surgical stapler according to claim 12, wherein a side of the fixed handle facing the movable handle is provided with a first engagement portion and a first biasing member, the first biasing member giving the first engagement portion a biasing force that makes it protrude from a surface of the fixed handle, and/or a side of the movable handle facing the fixed handle is provided with a second engagement portion and a second biasing member giving the second engagement portion a biasing force that makes it protrude from a surface of the movable handle;

when the movable handle rotates along the first direction, the movable handle moves towards the fixed handle, the first matching part retracts towards the inner side of the fixed handle, and/or the second matching part retracts towards the inner side of the movable handle.

15. The surgical stapler according to claim 6, wherein a side of the housing facing the movable handle is provided with a third fitting portion and a third biasing member, the third biasing member giving the third fitting portion a biasing force to protrude from a surface of the housing, and/or a side of the movable handle facing the housing is provided with a fourth fitting portion and a fourth biasing member giving the fourth fitting portion a biasing force to protrude from a surface of the movable handle;

when the movable handle rotates along the first direction, the movable handle moves towards the shell, the third matching part retracts towards the inner side of the shell, and/or the fourth matching part retracts towards the inner side of the movable handle.

16. The surgical stapler of claim 1, wherein the proximal end of the staple cartridge is provided with two axially extending stops, the two stops being connected to the lateral ends of the staple cartridge, respectively, or the distal end of the anvil is provided with two axially extending stops, the two stops being connected to the lateral ends of the anvil, respectively.

17. The surgical stapler of claim 16, wherein an inner side of each of the stops is provided with an axially extending groove.

18. The surgical stapler according to claim 6, wherein the anvil is provided with a stopper portion, the driver is provided with a holding portion, the holding portion is located at a distal end side of the stopper portion, and the driver is movable in a proximal direction until the holding portion abuts against the stopper portion, and the driver is movable in a proximal direction.

19. The surgical stapler of claim 6, wherein the driver is fixedly coupled to the anvil via a fastener or wherein the driver is directly fixedly coupled to the anvil.