WO2020119794A1

WO2020119794A1 - Firing mechanism and stapler

Info

Publication number: WO2020119794A1
Application number: PCT/CN2019/125257
Authority: WO
Inventors: 殷冬林; 乔伟; 张育峰
Original assignee: 天臣国际医疗科技股份有限公司
Priority date: 2018-12-14
Filing date: 2019-12-13
Publication date: 2020-06-18
Also published as: DE212019000464U1; BR212021010790U2; JP3235225U

Abstract

Disclosed are a firing mechanism and a stapler, comprising a staple pushing assembly. The staple pushing assembly comprises a firing rod (4), a connecting part and a staple pushing rod (2) being sequentially arranged in the direction from a proximal end to a distal end of the stapler, the connecting part is in linkage with the staple pushing rod (2), the firing rod (4) and the connecting part are selectively linked, and the connecting part has a first state and a second state. When a staple anvil does not reach a suitable position, the connecting part is in the first state, the firing rod (4) is not linked with the connecting part, and even if an operation handle (7) is held and moved, mistaken firing of the stapler is not caused; and when the staple anvil moves to the suitable position relative to a staple cartridge, the connecting part is in the second state, the firing rod (4) is linked with the connecting part, and if the operation handle (7) is held and moved at this moment, the firing rod (4), through the connecting part, can push the staple pushing rod (2) for firing, thus avoiding mistaken firing when an operation is not prepared on the premise of ensuring normal work of the staple pushing rod (2), and improving the usage safety of an instrument.

Description

Firing mechanism and stapler

Technical field

The invention relates to the technical field of medical devices, in particular to a firing mechanism and a stapler

Background technique

Instead of the doctor's manual operation, the anastomosis of the digestive tract and other physiological tissues is performed. The round-tube stapler is a common surgical instrument. Most of them use axial inward binding to form an end-to-end or end-to-side anastomosis of the esophagus, stomach, intestine and other physiological tissues. The segmental tissues are contained and contained in the stapler, and after the firing is completed, a circular anastomosis is formed on the tissue to reconstruct the human passage.

In the prior art, a round tube type stapler includes a stapler body, an operation handle movably connected to the stapler body, and a nail anvil assembly cooperating with the body. The stapler body includes a staple cartridge assembly disposed at a distal end, the staple cartridge assembly includes a ring-shaped staple cartridge, a cutter; and a knob disposed at a proximal end of the body, the knob can rotate relative to the body, and the stapler The interior of the body also includes a nail anvil shaft disposed from the proximal end to the distal end. Here, the distal end and the proximal end are relative to the operator. The end closer to the operator is the proximal end, and the end farther from the operator, that is, the end closer to the operation position is the distal end. In the stapler, the inside and the outside are relative to the axis of the stapler, the side near the axis is the inside, and the side away from the axis is the outside. The nail anvil assembly includes a nail anvil, a nail anvil cap disposed at a distal end of the nail anvil, and a knife anvil disposed inside the nail anvil. The nail anvil assembly may be directly connected to the distal end of the nail anvil shaft or connected through a nail anvil shaft connection . During tumor surgery, after removing the tumor tissue, the nail anvil shaft passes through the purse of the stump tissue and is located at the distal end of the stapler body. Rotate the knob to gradually reduce the distance between the nail anvil assembly and the nail cartridge After reaching a suitable distance, it can reach the firing state, and then the operating handle can be used to complete the anastomosis. With the continuous development of medical devices, the round tube stapler is also more and more widely used in the treatment of hemorrhoids and other diseases.

As mentioned above, both in tumor surgery and hemorrhoids treatment, before firing the stapler, it is necessary to rotate the knob to achieve the proper distance between the nail anvil assembly and the nail cartridge. However, when the tube-type stapler is actually used for the operation, the operator may accidentally hold the operating handle and cause a false firing when the distance between the anvil assembly and the staple cartridge does not reach the proper position, resulting in the failure of the operation. It may even cause a medical accident.

In addition, the operator may use the stapler to complete a firing, because of carelessness or inexperience, he may perform the next operation without replacing a new staple cartridge, which may result in a medical accident, such as a resection. There is no stitching, which causes great safety hazards.

In addition, after the operator operates the stapler to enter the firing state, if the operator finds that the surgical preparation is not perfect or there are other special circumstances that cannot be fired correctly, it needs to be able to return to the unfireable state, but the existing stapler cannot Realize this function.

Summary of the invention

In view of the problems in the prior art, the object of the present invention is to provide a firing mechanism and a round-tube stapler. When the distance between the nail anvil assembly and the nail cartridge does not reach a proper position, even if the operating handle is held, the firing lever It is also impossible to push the push rod without causing a false firing.

An embodiment of the present invention provides a firing mechanism for an stapler. The firing mechanism includes a push nail assembly. The push nail assembly includes a firing rod, a connecting portion, and a firing rod that are sequentially arranged from the proximal end to the distal end of the stapler. A nail push rod, the connecting part is linked with the nail push rod, and the connecting part has a first state and a second state; when the connecting part is in the first state, the firing rod is connected with the When the connection part is not linked, the stapler cannot be fired; when the connection part is in the second state, the firing rod and the connection part are linked, and the stapler can fire.

Optionally, the connecting portion includes at least one rotating block, the distal end of the rotating block is rotatably connected to the proximal end of the push rod; when the connecting portion is in the first state, the rotating block The proximal end flares outward; when the connecting portion is in the second state, the proximal end of the rotating block is folded inward.

Optionally, a screw threaded inside the push nail assembly is further included. The screw thread includes a first screw portion and a second screw portion. The second screw portion is located on the first screw. And the outer diameter of the second screw part is smaller than the outer diameter of the first screw part; when the distal end of the rotating block is located in the first screw part, the The proximal end flares outward; when the distal end of the rotating block is located in the second screw portion, the proximal end of the rotating block is folded inward.

Optionally, the inner wall of the distal end of the rotating block is provided with a boss, and when the connecting portion is in the first state, the boss of the rotating block interferes with the first screw portion.

Optionally, a mounting groove corresponding to the rotating block in one-to-one correspondence is provided at a proximal end of the nail push rod, and a distal end of the rotating block is rotatably installed in the mounting groove through a rotating shaft.

Optionally, a torsion spring is further provided on the rotating shaft, and the deformation recovery force of the torsion spring causes the distal end of the rotating block to gather inward with respect to the screw rod.

Optionally, the end of the boss of the rotating block is provided with a first guiding slope, and when the distal end of the rotating block is located on the first screw part, the first guiding slope of the end of the boss Conflict with the first screw part.

Optionally, a screw connection portion is further provided between the first screw portion and the second screw portion, and the outer surface of the screw connection portion is a transition surface.

Optionally, two rotating blocks are provided at the proximal end of the nail push rod, and the two rotating blocks are arranged oppositely.

Optionally, the distal end of the firing rod is provided with two opposing firing parts, and the firing parts respectively correspond to the proximal ends of the two rotating blocks in the axial direction when being folded.

Optionally, the firing mechanism further includes a safety device, the safety device includes a safety block corresponding to the rotating block, and a proximal end of the second screw portion is provided with a one-to-one correspondence with the safety block The first block of the fuse includes a first end and a second end. The first end of the fuse block is rotatably connected to the inside of the proximal end of the corresponding first groove. Optionally, the first end of the safety block is rotatably installed inside the proximal end of the first groove through a safety pin, a first torsion spring is provided on the safety pin, and the first torsion spring The deformation restoring force causes the safety block to rotate toward the proximal end of the stapler to protrude beyond the first groove.

Optionally, the proximal end of the push rod is provided with two first grooves communicating with each other, and the first ends of the two safety blocks are rotatably installed in the first recess through the same safety pin In the slot.

Optionally, the second end of the safety block is provided with a first guide slope inclined toward the first screw portion.

Optionally, the firing mechanism further includes a retracting device, the connecting part is in the second state, and when the retracting device enters the fourth state from the third state, the connecting part is guided The first state is entered from the second state.

Optionally, a screw threaded inside the push nail assembly is further included. The screw thread includes a first screw portion and a second screw portion. The second screw portion is located on the first screw. The far end of the department.

Optionally, the retracting device includes a retracting block, a first and second grooves are provided at the distal end of the first screw portion, and the retracting block is disposed in the second groove.

Optionally, the outer surface of the retraction block and the distal surface of the retraction block are perpendicular to each other.

Optionally, a stepped portion is provided on a distal end side of the first groove, the stepped portion defines a distal position of the retracting block.

Optionally, a distal end of the retracting block is provided with a driving part and a limiting part, the limiting part cooperates with the stepped part to define a distal position of the retracting block, the driving part It protrudes toward the distal end of the stapler relative to the limit portion.

Optionally, the diameter of the second screw portion is smaller than the diameter of the first screw portion; the connection portion includes at least one rotating block, and the rotating block corresponds to the retreating block in one-to-one correspondence. The distal end of the rotating block is rotatably connected to the proximal end of the nail push rod.

Optionally, the inner wall of the distal end of the rotating block is provided with a boss,

A first guide slope is provided at the end of the boss of the rotating block.

An embodiment of the present invention provides an anastomat, which is characterized by including the firing mechanism.

The firing mechanism and the stapler provided by the present invention have the following advantages:

The present invention provides a firing mechanism for a stapler. When the anvil assembly does not reach the proper position, the connecting portion is in the first state, and the firing rod and the connecting portion do not form a linkage. Even if the operating handle is held, the firing rod cannot Pushing the push rod will not cause false firing of the stapler. When the anvil assembly moves to a proper position relative to the staple cartridge, the connecting part is in the second state, and the firing rod is linked with the connecting part. If you hold the operating handle at this time The firing rod can push the push rod through the connecting part to fire; therefore, the present invention prevents false firing when the operation is not ready, and improves the safety of the instrument under the premise of ensuring the normal operation of the push rod.

In addition, when the distance between the anvil assembly and the staple cartridge does not reach the proper position, the connecting portion is in the first state, and the firing rod and the connecting portion are not linked, at this time, it will not cause false firing of the stapler, when the anvil assembly moves When it is in a proper position, the connecting part is in the second state, and the firing rod and the connecting part are linked. At this time, it can be fired normally. During the reset process after the firing, the safety device is in the second state and guides the connecting part to enter the first state again. Before the preparation for the next operation, the connecting part is always in the first state, and the stapler cannot be fired again; therefore, the present invention prevents false firing when the operation is not prepared, and effectively prevents The second firing when the nail cartridge that has been fired is not replaced, and at the same time, after the nail anvil assembly and the nail cartridge assembly reach the proper position, the doctor also needs to increase the distance between the nail anvil assembly and the nail cartridge assembly to provide the possibility to increase The safety of the use of equipment. At the same time, the transition of the connecting part between the first state and the second state is a direct transition, eliminating the uncertain fuzzy zone between the fireable state and the unfireable state of the stapler, and making the operation of the instrument safer.

In addition, when the distance between the anvil assembly and the nail cartridge does not reach the proper position, the connecting portion is in the first state, and the firing rod and the connecting portion are not linked, at this time, it will not cause false firing of the stapler. When moving to a suitable position, the connecting part is in the second state, and the firing lever and the connecting part are linked, and it can be fired normally at this time. After the connecting part enters the second state, if the retracting device goes from the third state to the fourth state, it can Guide the connecting part to return to the first state; thus not only can effectively prevent the false firing of the stapler, but also after the nail anvil assembly and the nail cartridge assembly reach the proper position, the doctor also needs to increase the distance between the nail anvil assembly and the nail cartridge assembly The distance provides the possibility to increase the safety of the device. At the same time, the transition of the connecting part between the first state and the second state is a direct transition, eliminating the uncertain fuzzy zone between the fireable state and the unfireable state of the stapler, and making the operation of the instrument safer.

BRIEF DESCRIPTION

In order to more clearly explain the technical solutions in the embodiments of the present invention, the drawings required in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without paying any creative work, other drawings can be obtained based on these drawings.

1 is a schematic structural diagram of an anastomotic device according to an embodiment of the present invention;

2 is a schematic view of an embodiment of the present invention with one side shell removed;

FIG. 3 is a schematic diagram of the cooperation between the pointer and the pull tab according to an embodiment of the invention;

4 is a schematic view of the structure of the matching part of the push rod and the screw rod in the failure protection mode of an embodiment of the present invention;

FIG. 5 is an exploded view of the matching part of the push rod and the screw rod in the failure protection mode of the stapler according to an embodiment of the invention;

FIG. 6 is a bottom view of a matching part of a push rod and a screw rod in a fail-safe mode according to an embodiment of the present invention;

7 is a cross-sectional view of the direction A1-A1 in FIG. 6;

8 is a schematic view of the structure of the stapling rod and screw rod matching part of the stapler in the firing mode according to an embodiment of the present invention;

FIG. 9 is a bottom view of the stapler and screw cooperating part of the stapler in a firable mode according to an embodiment of the invention;

10 is a cross-sectional view in the direction A2-A2 of FIG. 9;

FIG. 11 is a schematic structural view of a matching part of a push rod and a screw rod in a failure protection mode according to an embodiment of the present invention;

FIG. 12 is an exploded view of the matching part of the push rod and the screw rod in the failure protection mode of the stapler according to an embodiment of the invention;

13 is a bottom view of the matching part of the stapler and the screw according to an embodiment of the present invention in a failure protection mode;

14 is a cross-sectional view in the direction A1'-A1' of FIG. 13;

15 is a schematic view of the structure of the stapling rod and screw rod matching part of the stapler in the firing mode according to an embodiment of the present invention;

FIG. 16 is a bottom view of the stapler and screw cooperating part of the stapler in the firable mode according to an embodiment of the present invention;

17 is a cross-sectional view in the direction A2'-A2' in FIG. 16;

FIG. 18 is a schematic structural view of a part of a screw-fitting part when a staple assembly is reset after firing of an stapler according to an embodiment of the present invention;

FIG. 19 is a bottom view of a portion where the screw assembly is engaged with the screw when the staple assembly is reset after firing of the stapler according to an embodiment of the present invention;

20 is a cross-sectional view of the direction A3-A3 in FIG. 19;

21 is a schematic view of a part of the push nail assembly and the screw when the stapler according to an embodiment of the present invention returns from the firing mode to the fail-safe mode;

FIG. 22 is a bottom view of the matching part of the push pin assembly and the screw rod when the stapler according to an embodiment of the present invention returns to the fail-safe mode from the firable mode;

23 is a cross-sectional view in the direction A4-A4 of FIG. 22;

24 is a schematic view of the structure of the stapler and screw rod matching part of the stapler in a failure protection mode according to an embodiment of the present invention;

FIG. 25 is an exploded view of the matching part of the push rod and the screw rod in the failure protection mode of the stapler according to an embodiment of the invention;

Fig. 26 is a bottom view of the matching part of the push rod and the screw rod in the fail-safe mode of the stapler according to an embodiment of the present invention;

27 is a cross-sectional view in the direction A1"-A1" in FIG. 26;

FIG. 28 is a schematic diagram of the cooperation between the retraction block and the screw rod according to an embodiment of the invention;

FIG. 29 is a schematic view of the structure of the matching part of the push rod and the screw rod in the firing mode according to an embodiment of the present invention;

FIG. 30 is a bottom view of the matching part of the push rod and the screw rod in the firable mode of the stapler according to an embodiment of the present invention; FIG.

31 is a cross-sectional view in the direction A2"-A2" in FIG. 30;

FIG. 32 is a schematic diagram of a matching part of a push nail assembly and a screw rod when the stapler returns to the fail-safe mode from the firable mode according to an embodiment of the present invention;

FIG. 33 is a bottom view of the matching part of the push nail assembly and the screw rod when the stapler according to an embodiment of the present invention returns to the fail-safe mode from the firing mode;

Fig. 34 is a cross-sectional view in the direction A3'-A3' of Fig. 33;

FIG. 35 is a schematic structural view of a part that cooperates with a screw when a staple assembly is reset after firing of an stapler according to an embodiment of the present invention;

FIG. 36 is a bottom view of a portion where the screw assembly is engaged with the screw when the staple assembly is reset after firing of the stapler according to an embodiment of the present invention;

Fig. 37 is a cross-sectional view taken along the line A4'-A4' in Fig. 36.

detailed description

To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of the embodiments of the present invention, but not all the embodiments.

The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments. In order to solve the technical problems in the prior art, the present invention provides a firing mechanism for a stapler. The firing mechanism includes a push nail assembly, and a screw rod is penetrated in the push nail assembly. The nail-pushing assembly includes a firing rod, a connecting portion and a nail-pushing rod that are sequentially arranged from the proximal end to the distal end of the stapler, the connecting portion is linked with the nail-pushing rod, and the connecting portion and the firing rod can be Selective linkage. Specifically, the connecting part has a first state and a second state; when the connecting part is in the first state, the firing rod and the connecting part are not linked, and the connecting part cannot transmit the movement of the firing rod to the nail push rod, The stapler cannot be fired; when the connecting portion is in the second state, the firing rod is linked with the connecting portion, the connecting portion can transmit the motion of the firing rod to the nail push rod, and the stapler can fire.

Therefore, in the present invention, by dividing the push nail assembly into three parts, the connecting portion and the firing rod can be selectively linked. When the distance between the anvil assembly and the nail cartridge does not reach the proper position, the connecting portion is in the first state, the firing rod and the connecting portion do not form a linkage, and will not cause the false firing of the nail cartridge assembly, when the anvil assembly is relative to the nail When the magazine moves to a suitable position, the connecting part is in the second state, and the firing rod and the connecting part form a linkage. At this time, if the operating handle is held, the stapler can be fired.

In an embodiment of the present invention, the connecting portion includes at least one rotating block, and the distal end of the rotating block is rotatably connected to the proximal end of the push rod; when the connecting portion is in the first state, the rotation The proximal end of the block flares outward to form a cavity between the rotating block and the screw; when the connection portion is in the second state, the proximal end of the rotating block is folded inward, thereby entering the firing rod from near The path that moves from end to end. Here, flaring outward means that the proximal end of the rotating block flares away from the screw rod, and inward folding means that the proximal end of the rotating block folds toward the screw rod.

In this embodiment, the screw includes a first screw portion and a second screw portion, the second screw portion is located at the distal end of the first screw portion, and the outer portion of the second screw portion The diameter is smaller than the outer diameter of the first screw part; when the distal end of the rotating block is located in the first screw part, the proximal end of the rotating block flares outward; the distal end of the rotating block is located in the second screw At the time, the proximal end of the rotating block is folded inward.

In the initial state where the anvil assembly and the stapler body have just been successfully docked or the tissue has just been incorporated, the distal end of the rotating block interferes with the first screw portion, and the proximal end of the rotating block is oriented relative to the screw The outside is flared to form a cavity between the rotating block and the screw rod. When the firing rod moves from the proximal end of the stapler to the distal direction, it enters the cavity between the proximal end of the rotating block and the screw rod. Therefore, the firing rod and the rotating block are not linked. At this time, even if the operator accidentally pushes the handle to push the firing rod, it will not cause the firing of the stapler, thereby avoiding the false firing when the operation is not ready to be completed.

During the surgical preparation process, it is necessary to move the screw rod toward the proximal end of the stapler. When the screw rod moves to the distal end of the rotating block at the second screw rod part, the outer diameter of the second screw rod part is smaller than the first The outer diameter of the screw part, the proximal end of the rotating block is retracted inward relative to the screw, and when the firing rod moves from the proximal end of the stapler to the distal direction, it contacts the rotating block and interacts with the rotating block . At this time, if the operator pushes the handle to push the firing rod, the stapler is sequentially fired through the firing rod, the rotating block and the nail pusher, so as to realize the normal function of the stapler.

The structure of the stapler of the present invention will be described in detail below with reference to the drawings. Among them, in FIGS. 4 to 10, in order to clearly show each component, only a part of the screw is cut out to show the structure of the portion blocked by the screw.

As shown in FIGS. 1 and 2, it is the structure of the stapler according to an embodiment of the present invention. In order to more clearly show the internal structure of the stapler, in FIG. 2, one side of the stapler housing is removed, and the nail The cartridge assembly is shown separately from the stapler body. The stapler includes a stapler body and a nail anvil assembly 13. The stapler body includes a stapler housing 11 and a staple cartridge assembly 12 located at a distal end of the stapler casing 11. The staple cartridge assembly 12 includes an annular staple cartridge and a push nail For the sheet and cutter, the proximal end of the nail cartridge assembly 12 is provided with a push nail assembly. The anvil assembly 11 includes a nail anvil shaft and a nail anvil disposed at a distal end of the nail anvil shaft. The anvil shaft can drive the anvil to move in the axial direction of the anvil shaft, so that the anvil moves toward or away from the cartridge assembly 12.

In the present invention, the distal end and the proximal end are relative to the operator. The end closer to the operator is the proximal end, and the end farther from the operator, that is, the end closer to the operation position is the distal end. That is, in this embodiment, the operator holds the handle to operate the stapler when using it. In the perspective of FIGS. 1 and 2, the end biased to the right is the proximal end, and the end biased to the left is the distal end. For example, for the push nail assembly, the proximal end of the push nail assembly is the end that is biased to the right with respect to the distal end of the push nail assembly. For example, for the screw 6, the proximal end of the screw 6 is relative to the screw The distal end of 6 is biased towards the right end.

In this embodiment, the stapler further includes an operation handle 7 pivotally connected to the stapler body, the distal end of the operation handle 7 corresponds to the proximal end of the push nail assembly, and the operation handle 7 faces the stapler body The rotation action can drive the push nail assembly to move from the proximal end to the distal end of the stapler.

A knob 51 is further provided at the proximal end of the stapler body, and the knob 51 is connected to the proximal end of the nail anvil shaft through the screw assembly 6. When the knob 51 rotates, the screw shaft 6 drives the nail anvil shaft to move axially relative to the stapler body.

The structure of the circular tube-type stapler shown in FIGS. 1 to 2 is only an example. In practical applications, the structure of the circular tube-type stapler is not limited to the structure shown in the figure, and other forms can also be adopted to realize the stapler It can be fired only within the protection scope of the present invention.

As shown in FIG. 3, further, in this embodiment, the stapler body further includes a pointer 53 and a pull tab 52 located inside the stapler body, the proximal end of the pull tab 52 and the wire The rod 6 is connected, and can move along the axial direction of the screw rod with the movement of the screw rod 6. The distal end of the pull tab 52 is opposite to the first end of the pointer 53. The first end of the pointer 53 has a first position area H and a second position area H′, where the first end of the pointer 53 refers to It is the upper end of the pointer 53 in FIG. 3. The pointer 53 is pivotally fixed to the stapler housing 1, and when the pointer 53 rotates, its first end can move between the first position area H and the second position area H'.

In this embodiment, when the knob 51 rotates in the first direction, the screw rod 6 drives the pull tab 52 to move toward the proximal end of the stapler body, and the distal end of the pull tab 52 pulls the The first end of the pointer 53 moves from the first position area to the second position area. In practice, the first position area H generally refers to the initial position area of the pointer 53. At this time, the distance between the staple cartridge assembly 12 and the staple anvil assembly 11 is far away and the proper position is not reached. Therefore, the first position area H It is also a non-fireable area. As the knob 51 rotates in the first direction, the anvil shaft pulls the anvil toward the proximal end of the stapler, so that the distance between the anvil assembly and the staple cartridge assembly 12 reaches an appropriate position, and the pointer 53 is also pulled to the second position area H'by the pull tab 52, at this time the operator is allowed to fire the stapler, so the second position area H'is also called a fireable area. Therefore, the pointer 53 can be used as an indication of the position of the anvil shaft, to indicate whether the stapler has been prepared for surgery, and allows firing.

The manner of indicating the position of the anvil shaft here is only an example, and not as a limitation of the present invention. For example, the position of the anvil shaft may not necessarily be indicated by the pointer 53, and other methods may be used to indicate whether the anvil assembly has reached the firable position, or no visual indication is used.

The invention improves the push nail assembly and the screw rod. As shown in FIG. 4, it is a schematic structural diagram of a push nail assembly and a screw rod according to an embodiment of the present invention. The screw 6 includes a first screw portion 61 at the proximal end of the screw 6 and a second screw portion 62 at the distal end of the screw 6. The outer diameter of the second screw portion 62 is smaller than the first screw portion 61 And the screw 6 can move axially relative to the stapler body. The screw rod 6 is externally provided with a push nail assembly. The push nail assembly includes a firing rod 4, at least one rotating block 3 and a push rod 2 which are sequentially arranged from the proximal end to the distal end of the stapler. The rotating block 3 The distal end 31 is rotatably connected to the proximal end 21 of the push rod 2. The rotating block 3 can be selectively linked with the firing rod 4. When the rotating block 3 and the firing rod 4 are linked, when the rotating block 3 moves from the proximal end of the stapler to the distal direction, the nail bar assembly 12 at the distal end of the stapler body can be moved together by pushing the nail push rod by the nail push rod 2 The middle nail and cutter are launched to complete the stapler firing. The proximal end 42 of the firing rod 4 can be linked with the handle 7. When the handle 7 is gripped, the handle 7 can push the firing rod 4 to move from the proximal end of the stapler to the distal direction. In order to prevent the stapler from being accidentally fired when the anvil assembly is not moved to a proper position, the present invention further adds a failure protection mode.

In this embodiment, there are two rotating blocks 3, and they are arranged opposite to each other in the radial direction of the screw 6. However, the present invention is not limited to this. It is also possible to increase or decrease the number of rotating blocks 3 as needed, for example, only It is within the protection scope of the present invention to provide one rotating block 3 or four rotating blocks 3 surrounding the outside of the screw 6 and so on.

As shown in FIGS. 4-7, a schematic view of the circular tube-type stapler of this embodiment in an initial state is shown. At this time, the circular tube-type stapler is in the fail-safe mode, and the connecting part is in the first state. Specifically, in the initial state, the rotating block 3 is located in the first screw portion 61, the distal end 31 of the rotating block 3 is in conflict with the first screw portion 61, and the proximal end 32 of the rotating block 3 is opposite to the wire The rod 6 flares outward, forming a cavity 321 between the rotating block 3 and the screw rod 6. At this time, if the handle is held to move the firing rod 4 from the proximal end of the stapler to the distal direction, the distal end of the firing rod 4 enters the cavity 321 between the proximal end of the rotating block 3 and the screw rod 6. Therefore, the firing rod 4 and the rotating block 3 are not linked. At this time, even if the operator accidentally pushes the handle 7 to push the firing rod 4, the firing rod 4 cannot drive the push rod 2 to move to the distal end, and it will not cause the stapler Firing to avoid false firing when the surgery is not ready to be completed.

As shown in FIG. 5, in this embodiment, the inner wall of the distal end 31 of the rotating block 3 is provided with a boss 313. In the initial state, the boss 313 of the rotating block 3 and the first screw part 61, the proximal end 32 of the rotating block 3 flares outward with respect to the screw rod 6. In this embodiment, the proximal end 21 of the push rod 2 is provided with a mounting slot corresponding to the rotating block 3 one by one, and the distal end 31 of the rotating block 3 is rotatably mounted on the mounting slot through a rotating shaft 311 , And the boss 313 is located close to the proximal end of the mounting groove, that is, to the right of the mounting groove shown in the figure, without being limited by the mounting groove. The torsion spring 312 is also provided on the rotating shaft 311. In the initial state, the torsion spring 312 is deformed. When the distal end 31 of the rotating block 3 is located in the second screw portion 62, the torsion spring 62 is deformed The restoring force causes the distal end 31 of the rotating block 3 to gather inward relative to the screw 6.

As the screw 6 gradually moves toward the proximal end, the stapler is gradually closed, and when the proper position is reached, the rotating block 3 disengages from the first screw portion 61.

As shown in FIG. 5, a first guide slope 314 is provided at the end of the boss 313 of the rotating block 3. In the initial state, the first guide slope 314 at the end of the boss 313 and the first screw portion 61 conflict. In the initial state, since the proximal end 32 of the rotating block 3 rotates outward, the boss 313 has a certain inclination angle. If the first guide slope 314 is not provided, the contact between the end of the boss 313 and the first screw portion 61 is a point By providing the first guide slope 314, in the initial state, the contact between the boss 313 and the first screw portion 61 becomes a surface contact, thereby increasing the end of the boss 313 and the first screw portion 61 The contact area between them improves the overall stability of the stapler in the initial state.

In this embodiment, a screw connection portion 63 is further provided between the first screw portion 61 and the second screw portion 62, and the outer surface 63 of the screw connection portion is a transition surface, for example, an inclined surface.

Corresponding to the two rotating blocks 3, the distal end 41 of the firing rod 4 is provided with two opposing firing portions, and the firing portions are axially opposite to the proximal ends of the two rotating blocks 3 when folded inward Correspondingly, it can be linked with the rotating block 3 when the two rotating blocks 3 are folded inward. In order to improve the structural cooperation between the firing rod 4 and the screw rod 6, the firing rod 4 further includes a firing rod connecting portion 43 between the two firing sections, which is formed as an arc surface concave outward with respect to the screw rod, the arc surface Compatible with the outer surface of the screw 6. It can be understood that, when the outer surface of the screw 6 is not a curved surface, the inner surface of the firing rod connecting portion 43 is also a non-arc surface corresponding to it, so that when the firing rod 4 moves to the distal end , Can be supported and guided, making the stapler's firing more stable.

8 to 10 show a schematic diagram of the structure of the circular tube-type stapler of the present invention when the anvil assembly and the staple cartridge assembly reach the proper position during the operation. At this time, the stapler is in the normal firing mode, and the connecting portion is in the second status. When preparing for the operation, the operator turns the proximal knob 51 to drive the screw 6 toward the proximal end of the stapler. The screw 6 moves to the distal end 31 of the rotating block 3 when it is located at the second screw portion 62. The outer diameter of the second screw portion 62 is smaller than the outer diameter of the first screw portion 61, and the proximal end 32 of the rotating block 3 receives the restoring force of the torsion spring 312 and gathers inwardly with respect to the screw 6 so as to at least partially enter The path of the firing rod 4 moving from the proximal end to the distal end. When holding the handle 7 to fire the stapler, the firing rod 4 moves from the proximal end to the distal end of the stapler, and the firing rod 4 is linked with the rotating block 3. During the firing process, when the distal end of the rotating block 3 moves relatively to the second screw part 62, the distal end 31 of the rotating block 3 may interfere with the second screw part 62, or may be suspended, that is, the second screw part The outer diameter of 62 can be designed to be smaller, both of which can achieve the purpose of gathering the proximal end 32 of the rotating block 3 inward. Preferably, the proximal end of the rotating surface and the distal end of the firing rod oppose each other, and, when resisting, the abutting surface is perpendicular to the axis direction to prevent non-operation during firing The mutual guiding action of the vertical resisting surfaces causes an increase in the firing force during anastomosis.

When the pointer 53 is used as the position indication of the anvil assembly in the stapler, when the pointer 53 is located in the first position area H, the distal end 31 of the rotating block 3 interferes with the first screw portion 61 having a larger outer diameter, and the rotating block The proximal end 32 of 3 is flared to the outside without interlocking with the firing rod 4 and the stapler is in the fail-safe mode. At this time, even if the handle 7 is held, the stapler will not be fired. When the pointer 53 is pulled by the pull tab 52 to enter the second position area H′, the distal end 31 of the rotating block 3 is located at the first screw portion 62 with a smaller outer diameter, and the proximal end 32 of the rotating block 3 is folded inward In conjunction with the firing rod 4, the stapler is in a normal firing mode, and if the handle 7 is held at this time, the stapler can be fired normally.

However, some careless or inexperienced operators may want to fire the stapler when the pointer 53 is in the first position area, because the distance between the staple cartridge and the anvil assembly 12 does not reach the proper position , The operation will fail. In addition, when the staple cartridge is not replaced after the stapler firing is completed, the pointer 53 is still in the second position area H'because the position of the screw 6 has not changed. The operator may see the pointer 53 in the second position Area H'mistakenly thought that the preparation for the operation was completed, and firing the stapler again would also fail the operation.

Therefore, the present invention also provides a firing mechanism for an stapler, the firing mechanism includes a push nail assembly and a safety device, the push nail assembly includes a firing rod that is sequentially arranged from the proximal end to the distal direction of the stapler, A connecting part and a push rod, the connecting part is linked with the push rod, and the connecting part has a first state and a second state, the safety device has a first state and a second state; the safety device When in the first state, the connecting part can enter the second state from the first state, and when the safety device is in the second state, guide the connecting part from the second state to the first state; the connecting part is in the first state In one state, the firing rod and the connecting part are not linked, and the stapler cannot be fired; when the connecting part is in the second state, the firing rod and the connecting part are linked, and the stapler can fire.

The working status of the round-tube stapler of the present invention will be introduced in four stages:

In the initial state in which the anvil assembly and the stapler body have just docked successfully or the initial state in which the tissue has just been incorporated, the connecting portion is in the first state, and the firing rod and the connecting portion are not linked. At this time, even if the operator accidentally presses the handle to push the firing rod, the firing rod moves from the proximal end to the distal direction of the stapler, and does not drive the connecting part to move toward the distal end of the stapler, and it does not cause the stapler Firing to avoid false firing when the surgery is not ready to be completed.

After the preparation for surgical firing is completed, the anvil assembly 13 and the staple cartridge assembly 12 reach a suitable distance, the safety device is in the first state, the connection part enters the second state from the first state, and the firing rod and the connection part are linked. At this time, the operator pushes the handle, and can push the connecting part and the nail push rod to move in the distal direction of the stapler by the firing rod, so as to realize the firing of the stapler.

After the stapler is fired, the safety device enters the second state, and guides the connecting part from the second state to the first state again, and the connecting part will always be in the first state. At this time, the firing rod and the connecting part are not linked. At this time, even if the operator accidentally holds the handle and pushes the firing rod, the stapler cannot be fired, thereby effectively preventing the doctor from injuring the tissue again after the firing and causing injury, and improving the safety of using the instrument.

Therefore, the present invention prevents false firing when the nail anvil assembly 13 and the nail cartridge assembly 12 do not reach the proper position during the operation on the premise of ensuring that the push nail assembly can work normally after the operation preparation is completed, and effectively prevents the doctor during the operation After the firing is completed, the damage to the tissue is fired again, which improves the safety of the device. Here, at least the preparations for the operation must be completed: the distance between the anvil assembly and the nail cartridge reaches a suitable position, and the nail cartridge assembly is installed with an unfired new nail cartridge assembly. These two conditions can ensure the successful completion of the operation.

The structure of the stapler of the present invention will be described in detail below with reference to the drawings. Among them, in FIGS. 11 to 23, in order to clearly show each component, only a part of the screw is cut to show the structure of the portion shielded by the screw.

As shown in FIGS. 1 to 3 and FIG. 11, it is a schematic structural diagram of a push nail assembly and a screw rod according to an embodiment of the invention. The screw 6 includes a first screw portion 61 at the proximal end of the screw 6 and a second screw portion 62 at the distal end of the screw 6. The outer diameter of the second screw portion 62 is smaller than the first screw portion 61 And the screw 6 can move axially relative to the stapler body. The proximal end of the second screw portion 62 is provided with at least one first groove 621, and a rotatable safety block 64 is fixed inside the proximal end of each first groove 621. The safety block 64 is the safety device. The first end of the safety block 64 is rotatably connected to the inner side of the proximal end of the first groove 621. Here, the first end of the safety block 64 refers to the end near the axis of the screw 6 and the second end refers to the end away from the axis of the screw 6. For the insurance block 642 located relatively at the upper end, the first end of the insurance block 641 is the bottom end of the insurance block 641, and the second end is the top end of the insurance block 641. For the insurance block 642 located relatively at the lower end The first end of the insurance block 642 is the top of the insurance block 642, and the second end is the bottom end of the insurance block 642. The screw rod 6 is externally provided with a push nail assembly, the push nail assembly includes a firing rod 4, a connecting portion and a push rod 2 which are sequentially arranged from the proximal end to the distal end of the stapler, the connecting portion includes at least one rotation Block 3, the distal end 31 of the rotating block 3 is rotatably connected to the proximal end 21 of the push rod 2, the rotating block 3 corresponds one-to-one with the safety block 64. The rotating block 3 and the push rod 2 are linked, and the firing rod 4 and the rotating block 3 are selectively linked. The proximal end 42 of the firing rod 4 can be linked with the handle 7. When the handle 7 is gripped, the handle 7 can push the firing rod 4 to move from the proximal end of the stapler to the distal direction. When the firing rod 4 is linked with the rotating block 3, holding the handle 7 can push the nail pushing rod 2 through the firing rod 4 and the rotating block 3 to push out the staple cartridge and cutter in the staple cartridge assembly 12 at the distal end of the stapler body. Complete the stapler firing. In order to prevent the stapler from being accidentally fired when the anvil assembly is not moved to a proper position, the present invention further adds a failure protection mode. When the firing rod 4 and the rotating block 3 are not linked, holding the handle 7 can only push the firing rod 4 to move to the distal end, but cannot push the connecting portion 3 and the nail pushing rod 2 to move to the distal end, and thus cannot fire the stapler.

When the safety device is in the first state, the safety block 64 rotates toward the distal end side of the first groove 621 without blocking the distal end of the rotation block 3 from moving to the second screw portion 62, that is, the connecting portion can be moved from the first state In the second state, when the safety device is in the second state, that is, when the safety block 64 is in the second state, the second end of the safety block 64 protrudes from the first groove 621 to guide the rotating block 3 toward The first screw portion 61 moves, that is, the safety block 64 guides the connecting portion from the second state to the first state.

As shown in FIGS. 11-14, a schematic view of the circular tube-type stapler of this embodiment in an initial state is shown. At this time, the circular tube-type stapler is in a fail-safe mode, and the connecting part is in the first state. Specifically, in the initial state, the fuse block 64 is not in contact with the rotating block 3, and the second end of the fuse block 64 protrudes from the first groove 621. The rotating block 3 is located in the first screw portion 61, the distal end 31 of the rotating block 3 is in contact with the first screw portion 61, and the proximal end 82 of the rotating block 3 is flared outward with respect to the screw 6, A cavity 321 is formed between the rotating block 3 and the screw 6. At this time, if the handle is held to move the firing rod 4 from the proximal end of the stapler to the distal direction, the distal end of the firing rod 4 enters the cavity between the proximal end of the rotating block 3 and the screw rod 6. Therefore, the firing rod 4 and the rotating block 3 are not linked. At this time, even if the operator accidentally pushes the handle 7 to push the firing rod 4, the firing rod 4 cannot drive the push rod 2 to move to the distal end, and it will not cause the stapler Firing to avoid false firing when the surgery is not ready to be completed.

As shown in FIG. 12, in this embodiment, the inner wall of the distal end 31 of the rotating block 3 is provided with a boss 313. In the initial state, the boss 313 of the rotating block 3 and the first screw part 61, the proximal end 82 of the rotating block 3 flares outward with respect to the screw rod 6. In this embodiment, the proximal end 21 of the push rod 2 is provided with a mounting slot corresponding to the rotating block 3 one by one, and the distal end 31 of the rotating block 3 is rotatably mounted on the mounting slot through a rotating shaft 311 , And the boss 313 is located close to the proximal end of the mounting groove, that is, to the right of the mounting groove shown in the figure, without being limited by the mounting groove. A second torsion spring 312 is also provided on the rotating shaft 311. In the initial state, the second torsion spring 312 is deformed. When the distal end 31 of the rotating block 3 is located in the second screw portion 62, the first The deformation restoring force of the second torsion spring 62 causes the distal end 31 of the rotating block 3 to gather inward relative to the screw 6.

In this embodiment, the insurance block 64 is correspondingly provided with two upper and lower blocks: a first insurance block 641 and a second insurance block 642, the first insurance block 641 and the second insurance block 642 are rotatably mounted on the same insurance pin 622 In the first groove 621. The first groove 621 of the first fuse block 641 and the first groove 621 of the second fuse block 642 are connected up and down. It can also be said that the two fuse blocks share a first groove 621. In other embodiments, the first fuse block 641 and the second fuse block 642 may be respectively provided with a first groove 621, the two first grooves 621 are not connected to each other, and the first fuse block 641 and the second fuse block 642 A safety pin 622 is rotatably connected to the inside of the proximal end of the corresponding first groove 621 respectively. In other embodiments, if the number of rotating blocks 3 changes, the number of fuse blocks 64 may also change correspondingly. The first grooves 621 of each fuse block 64 may be connected or separate.

In this embodiment, the safety pin 622 is provided with a first torsion spring 623, and the anvil assembly 13 moves toward the proximal end when the operation is prepared, that is, when the screw 6 moves toward the proximal end of the stapler, the far side of the rotating block 3 When the end 31 pushes the second end of the safety block 64 to rotate toward the distal end side of the first groove 621, the first torsion spring 623 deforms. When the anvil assembly 13 and the staple cartridge assembly 12 reach the proper positions, the stapler fires , The rotating block 3 moves toward the distal end of the stapler to disengage from the fuse block 64, and the deformation recovery force of the first torsion spring 623 restores the fuse block 64 to the initial state, that is, the second end of the fuse block 64 is near the stapler The end rotates to protrude from the first groove 621. Specifically, the closing process when preparing for surgery, the state of the safety block 64 when the stapler is fired, and when the stapler is reset will be described in detail below.

In this embodiment, the distal end of the first screw portion 61 is further provided with a second groove 611 corresponding to the rotating block 3 one by one, each second groove 611 is provided with a retracting block 65, the second The distal end of the groove 611 may extend all the way to the screw connection 63. The outer surface of the retracting block 65 is in contact with the rotating block, and the outer surface of the retracting block 65 and the distal end face thereof are perpendicular to each other. In the initial state, the distal end 31 of the rotating block 3 interferes with the outer side of the retracting block 65. In this embodiment, the back-off block includes a first back-off block 651 and a second back-off block 652. From the perspectives in FIGS. 11 and 12, the distal end 31 of the upper rotating block 3 interferes with the upper side of the first retracting block 651, and the distal end 31 of the lower rotating block 3 interferes with the lower side of the second retracting block 652 side. The function of the back-off block 65 will be described in detail below with reference to FIGS. 21-23.

The second end of the safety block 64 is provided with a second guide slope 643 inclined toward the first screw portion 61. After the stapler is fired, the rotary block 3 moves toward the proximal end of the stapler to reset, the distal end 31 of the rotary block 3 The distal end 31 of the rotary block 3 moves along the second guide slope 643 to interfere with the first screw portion 61. Therefore, the first guide slope 643 can better serve as a transition between the second screw portion 62 and the first screw portion 61 to guide the movement of the rotating block 3 toward the proximal end of the stapler.

As shown in FIG. 12, in this embodiment, the end of the boss 313 of the rotating block 3 is provided with a second guide slope 314. In the initial state, the first guide slope 814 of the end of the boss 313 and the first A screw portion 61 interferes, in this embodiment, the outer surface of the retracting block 65. In the initial state, since the proximal end 82 of the rotating block 3 rotates outward, the boss 313 has a certain inclination angle. If the first guide slope 814 is not provided, the end of the boss 313 and the first screw portion 61 (or retreat) The contact of the block 65) is a point contact, and by providing the first guide slope 814, in the initial state, the contact between the boss 313 and the first screw portion 61 (or the retreating block 65) becomes a surface contact, thereby adding The contact area between the end of the boss 313 and the first screw portion 61 is increased, and the stability of the overall stapler in the initial state is improved. In addition, during the reset process after the stapler is fired, the first guide slope 814 will contact the distal end of the retracting block 65 and push the retracting block 65 toward the proximal end side of the second groove 611. Without the first guiding slope 814, the distal end 31 of the rotating block 3 and the distal end of the retracting block 65 would be point-to-point contact, which is very unstable. After the addition of the first guiding slope 814, the retracting block 65 can be better pushed to the proximal end.

Corresponding to the two rotating blocks 3, the distal end 41 of the firing rod 4 is provided with two opposing firing portions, and the firing portions are axially opposite to the proximal ends of the two rotating blocks 3 when folded inward Correspondingly, it can be linked with the rotating block 3 when the two rotating blocks 3 are folded inward. In order to improve the structural cooperation between the firing rod 4 and the screw rod 6, the firing rod 4 further includes a firing rod connecting portion 43 between the firing sections, which is formed as an arc surface recessed outward with respect to the screw rod 6. The outer surface shape of the screw 6 is adapted. It can be understood that, when the outer surface of the screw 6 is not a curved surface, the inner surface of the firing rod connecting portion 43 is also a non-arc surface corresponding to it, so that when the firing rod 4 moves to the distal end , Can be supported and guided, making the stapler's firing more stable.

15 to 17 show a schematic diagram of the structure of the circular tube-type stapler of the present invention when the nail anvil assembly and the staple cartridge assembly reach a suitable position during the operation. At this time, the stapler is in a normal firing mode, and the connecting portion is in the first position. status. When preparing for the operation, the operator turns the proximal knob 51 to drive the screw 6 toward the proximal end of the stapler. During the movement of the screw 6, the rotating block 3 contacts the fuse block 64, and then A thrust toward the distal end of the stapler, so the distal end 31 of the rotating block 3 pushes the second end of the safety block 64 to the distal end of the first groove 621 in the third state, so that the safety block 64 can rotate the rotating block 3 avoidance, and the first torsion spring 623 is torsionally deformed. Since the distal surface and the outer surface of the retracting block 65 are perpendicular to each other, when the screw rod 6 moves to the proximal end, there is no transition surface, and when the rotating block 3 and the retracting block 65 are detached, they will suddenly detach . When the distal end 31 of the rotating block 3 is located in the second screw portion 62, since the outer diameter of the second screw portion 62 is smaller than the outer diameter of the first screw portion 61, the proximal end 82 of the rotating block 3 is twisted The restoring force of the spring 312 is retracted inwardly with respect to the screw rod 6 so as to at least partially enter the path where the firing rod 4 moves from the proximal end to the distal end. When holding the handle 7 and firing the stapler, the firing rod 4 moves from the proximal end to the distal end of the stapler, interlocking with the rotating block 3. That is, the rotating block 3 moves distally to the second screw part 62, and the distal end 31 of the rotating block 3 can cross the fuse block 64 and collide with the second screw part 62, or it can be suspended over the fuse block 64, that is, the second The outer diameter of the screw portion 62 can be designed to be smaller, or the distal end 31 of the rotating block 3 can interfere with the second end of the safety block 64, etc., all of which can close the proximal end 82 of the rotating block 3 inward purpose. When the pointer 53 is used as the position indication of the anvil assembly in the stapler, when the pointer 53 is located in the first position area, the distal end 31 of the rotating block 3 interferes with the first screw portion 61 having a larger outer diameter, and the rotating block 3 The proximal end 82 of the splayed to the outside without interlocking with the firing rod 4, the stapler is in the fail-safe mode, and even if the handle 7 is held, the stapler will not be fired at this time. When the pointer 53 is pulled by the pull tab 52 and enters the second position area, the distal end 31 of the rotating block 3 is located at the first screw portion 62 with a smaller outer diameter, and the proximal end 82 of the rotating block 3 is folded inward to The firing rod 4 is linked, and the stapler is in a normal firing mode. At this time, if the handle 7 is held, the stapler can be fired normally.

When the stapler is fired, the rotating block 3 moves toward the distal end of the stapler until the rotating block 3 is separated from the fuse block 64. The rotating block 3 comes to the distal side of the fuse block 64. The second end of the fuse block 64 is lost due to In response to the force of the rotating block 3, it returns to the fourth state under the action of the first torsion spring 623, that is, the second end of the safety block 64 rotates toward the proximal portion of the stapler to protrude beyond the first groove 621.

As shown in FIGS. 18 to 20, it shows the structure of the part that cooperates with the screw rod when the push nail assembly is reset after the stapler of this embodiment is fired. When the push pin assembly is reset, the safety device is in the second state, and the rotating block 3 is reset toward the proximal end of the stapler. The distal end 31 of the rotating block 3 first interferes with the safety block 64. In this embodiment, the safety block 64 Both ends are provided with a first guide slope 643 toward the first screw portion 61, and the rotary block 3 moves along the first guide slope 643 in the proximal direction of the stapler. As the outer diameter of the screw 6 of the portion where the distal end 31 of the rotating block 3 abuts becomes larger and larger, the proximal end 82 of the rotating block 3 will gradually expand outward, so that the firing rod 4 and the rotating block 3 become Not linked, that is, the stapler is still in the fail-safe mode. If you accidentally hold the handle 7 and push the firing rod 4, the firing rod 4 will still enter the cavity 321 between the rotating block 3 and the screw rod 6, so as to avoid failure. The second firing during the replacement of the staple cartridge caused the operation to fail.

In the state of FIGS. 15-17, the stapler is already in a fireable mode, the connecting portion is in the second state, and the proximal end 82 of the rotating block 3 is retracted inward relative to the screw rod 6. At this time, if you hold the handle 7, you can sequentially The stapler is fired by the firing rod 4, the rotating block 3 and the nail push rod 2. In this state, if the operator finds that the surgical preparation is not perfect or there are other special circumstances that need to be returned to the fail-safe mode, this function can be achieved through the retraction block 65. For example, at this time, the operator needs to increase the distance between the staple cartridge assembly 12 and the anvil assembly 13, that is, the knob 51 will be rotated in the opposite direction, at this time, the screw 6 moves to the distal end, and the retracting block 65 It will be pushed to the proximal end by the rotating block 3, and at the same time, the retracting compression spring 612 will be compressed.

Specifically, as shown in FIGS. 21 to 23, it is a schematic diagram of the mating part of the push nail assembly and the screw when the stapler returns from the firable mode to the fail-safe mode according to an embodiment of the present invention. status. In the fireable mode, the boss 313 of the distal end 31 of the rotating block 3 is located between the retracting block 65 and the safety block 64. At this time, it is only necessary to rotate the knob 51 in the second direction, the second direction is opposite to the first direction, the screw 6 re-drives the anvil axially to move the distal end of the stapler in the opposite direction, and the first end of the pointer 53 returns to the first position . At this time, the first guiding slope 814 of the distal end 31 of the rotating block 3 is in contact with the distal end of the retracting block 65, and the rotating block 3 gives the retracting block 65 a thrust in the proximal direction of the stapler through the first guiding slope 814 , So that the retracting block 65 moves toward the proximal end side of the second groove 611. A retracting spring 612 is provided between the proximal end side of the second groove 611 and the retracting block 65, and the retracting spring 612 is compressed and deformed by the retracting block 65. As the distal end 31 of the rotating block 3 moves toward the proximal end of the stapler, the proximal end 82 of the rotating block 3 gradually expands outward relative to the screw 6 and the stapler returns to the fail-safe mode again. The firing lever 4 is not linked.

After the stapler is fired, the push pin assembly will move to the proximal end under the action of the reset structure, that is, during this process, the rotating block 3 will also move toward the proximal direction, when passing the safety block 6, it will follow the safety The first guiding slope 643 of the block is gradually expanded to form the cavity 321, at this time the safety block 64 is in the fourth state, the push pin assembly is in the first state, and the firing rod 4 is not interlocked with the connection part and coincides The device is in a disabled state and cannot be fired.

However, some careless or inexperienced operators may want to fire the stapler when the pointer 53 is in the first position area, because the distance between the staple cartridge and the anvil assembly 12 does not reach the proper position , The operation will fail. In addition, after the operator operates the stapler from the unfireable state to the fireable state, if the operator finds that the surgical preparation is not perfect or there are other special circumstances that cannot be fired correctly, it needs to be able to return to the unfireable state.

Therefore, an embodiment of the present invention further provides a firing mechanism for an anastomotic device. The firing mechanism includes a push nail assembly and a retracting device. The push nail assembly includes an orderly arrangement from the proximal end to the distal end of the stapler. A firing rod, a connecting part and a nail pushing rod, the connecting part is linked with the nail pushing rod, and the connecting part has a first state and a second state, and the retracting device includes a third state and a fourth state; When the connecting part is in the first state, the firing rod and the connecting part are not linked, and the stapler cannot be fired; when the connecting part is in the second state, the firing rod and the connecting part are linked, and the stapler Can be fired. An embodiment of the present invention also provides an anastomotic device, including the firing mechanism.

By adopting the present invention, when the distance between the nail anvil assembly and the nail cartridge does not reach the proper position, the connecting portion is in the first state, and the firing rod and the connecting portion are not linked, at this time, it will not cause false firing of the stapler. When the anvil assembly is moved to a suitable position, the connecting part is in the second state, and the firing rod and the connecting part are linked, and normal firing can be performed at this time, thereby ensuring that false firing is effectively prevented under the premise that the stapler can work normally.

In addition, when the connecting part is in the second state and the retracting device enters the fourth state from the third state, the connecting part is guided from the second state to the first state, that is, the stapler is retracted from the fireable state To the unfireable state, it is convenient for the operator to adjust the instrument. Therefore, after the nail anvil assembly and the staple cartridge assembly reach the proper positions, the doctor is also required to increase the distance between the nail anvil assembly and the cartridge assembly.

The structures of the firing mechanism and the stapler according to an embodiment of the present invention are further described below with reference to FIGS. 1-36. Among them, in FIGS. 24 to 27, in order to clearly show each component, only a part of the screw is cut to show the structure of the portion shielded by the screw.

As shown in FIGS. 1 to 3 and FIGS. 24 to 28, the firing mechanism of this embodiment includes a push nail assembly and a retracting device. The push nail assembly includes a firing rod 4 that is sequentially arranged from the proximal end to the distal end of the stapler. A connecting part and a push rod 2, the connecting part is linked with the push rod 2, and the connecting part has a first state and a second state, and the retracting device includes a third state and a fourth state; When the connecting part is in the first state, the firing rod 4 is not linked with the connecting part, and the stapler cannot be fired to prevent accidental firing of the stapler; when the connecting part is in the second state, the firing rod 4 Linked with the connecting part, the stapler can be fired. The connection part is in the second state, and when the retracting device enters the fourth state from the third state, the connection part is guided from the second state to the first state, that is, from the fireable state to the fireable state . Therefore, not only can the false firing of the stapler be effectively prevented under the premise that the stapler can work normally, but after the nail anvil assembly and the nail cartridge assembly reach the proper position, the doctor also needs to increase the nail anvil assembly and the nail cartridge assembly The distance between them offers the possibility.

In this embodiment, the firing mechanism further includes a screw 6 threaded inside the push nail assembly, the screw 6 includes a first screw portion 61 and a second screw portion 62, the second When the screw part 62 is located at the distal end of the first screw part 61, when the connecting part is located at the first screw part 61, the connecting part is in the first state, and the connecting part is located at the second screw At 62, the connecting portion is in the second state.

The retracting device includes a retracting block 65, a second groove 711 is formed at the distal end of the first screw portion 61, the retracting block 65 is disposed in the second groove 711, When the retreat block 65 is located at the distal end side of the second groove 711, the retreat block 65 is in the third state, and when the retreat block 65 is located at the proximal end side of the second groove 711, the retreat The block 65 is in the fourth state; when the connecting portion enters the first state from the second state, the retracting block 65 is pushed to move from the distal side to the proximal side of the second groove 711.

Further, a retracting compression spring 612 is provided between the retracting block 65 and the proximal end side of the second groove 711, and the connecting portion pushes the retracting block 65 toward the proximal end side of the first groove 711 When moving, the retracting compression spring 612 is compressed, and after the retracting block 65 is detached from the connection portion, that is, after the external force received by the retracting block 65 is eliminated, the deformation recovery force of the retracting compression spring 612 The retracting block 65 can be pushed toward the distal side of the second groove 711.

Further, a screw connecting portion 63 is further provided between the first screw portion 61 and the second screw portion 62, the outer surface of the screw connecting portion 63 is a transition surface, and the second groove 711 It extends from the first screw portion 61 to the screw connection portion 63. The transition surface is, for example, an inclined surface.

In this embodiment, the outer surface of the retracting block 65 is preferably perpendicular to the distal end surface of the retracting block 65. When the screw 6 moves toward the proximal end, the connecting portion is removed from the first screw portion 61 moves to the second screw part 62, because there is no transition surface in the movement trajectory without the connecting part, when the rotating block 3 and the retracting block 65 are detached, they will suddenly detach, that is, the connecting part is in the first state and The transition between the second states is a direct transition, which eliminates the uncertain fuzzy zone between the fireable state and the unfireable state, and makes the operation of the instrument safer.

As shown in FIG. 28, the distal end side of the second groove 711 is provided with a step portion 613 that defines the distal position of the retracting block 65. The distal end of the retracting block 65 is provided with a driving portion 653 and a limiting portion 654, the limiting portion 654 cooperates with the stepped portion 613 to define the distal position of the retracting block 65, The driving portion 653 protrudes toward the distal end of the stapler relative to the limiting portion 654. When the connecting portion pushes the retracting block 65, the connecting portion is in direct contact with the driving portion 653.

In this embodiment, the diameter of the second screw portion 62 is smaller than the diameter of the first screw portion 61. The connecting portion includes at least one rotating block 3, the rotating block 3 corresponds to the retracting block 65 one by one, the distal end 31 of the rotating block 3 is rotatably connected to the proximal end 21 of the push rod 2, When the connecting portion is in the first state, the distal end of the rotating block 3 is located in the first screw portion 61, and the proximal end 82 of the rotating block 3 is splayed outward. At this time, holding the handle 7 and firing the lever 4 It will enter the cavity 321 surrounded by the rotating block 3 and the screw rod 6 without interlocking with the rotating block 3 and will not fire the stapler. When the connecting portion is in the second state, when the distal end 31 of the rotating block 3 is located in the second screw portion 62, the proximal end 82 of the rotating block 3 is folded inward, and at this time, holding the handle 7, the firing lever 4 will push the rotating block 3 to move to the distal end of the stapler together to fire the stapler. When the connecting portion is in the second state and the screw 6 moves toward the distal end of the stapler, the distal end 31 of the rotating block 3 pushes the retracting block 65 toward the proximal end side of the second groove 711 The movement makes the retreating block 65 enter the fourth state from the third state, and the distal end 31 of the rotating block 3 moves to the first screw portion 61, and the connecting portion retreats back to the first state.

In this embodiment, the inner wall of the distal end 31 of the rotating block 3 is provided with a boss 313. When the connecting portion is in the first state, the boss 313 of the rotating block 3 and the first screw portion 61 conflict. The proximal end 21 of the push rod 2 is provided with a mounting groove corresponding to the rotating block 3 one by one, the distal end 31 of the rotating block 3 is rotatably mounted in the mounting groove through a rotating shaft 311, and the convex The stage 313 is located close to the proximal end of the mounting groove, that is, to the right of the mounting groove shown in the figure, without being restricted by the mounting groove. A second torsion spring 312 is also provided on the rotating shaft 311. In the initial state, the second torsion spring 312 is deformed. When the distal end 31 of the rotating block 3 is located in the second screw portion 62, the first The deformation restoring force of the second torsion spring 62 causes the distal end 31 of the rotating block 3 to gather inward relative to the screw 6.

In addition, when the staple cartridge is not replaced after the stapler firing is completed, the pointer 53 is still in the second position area because the position of the screw 6 is not changed. The operator may see the pointer 53 in the second position area and mistakenly think that the surgery has been prepared. And firing the stapler again will also fail the operation.

In order to further prevent the second firing of the stapler, the firing mechanism of this embodiment further includes a safety device. When the safety device is in the first state, the connecting portion can enter the second state from the first state, and the safety device is in In the second state, the connection part is guided from the second state to the first state.

Specifically, the proximal end of the second screw portion 62 is provided with at least one first groove 721, and a rotatable fuse block 64 is fixed inside the proximal end of each first groove 721, and the fuse block 64 is the fuse In the device, the first end of the safety block 64 is rotatably connected to the inside of the proximal end of the first groove 721. Here, the first end of the safety block 64 refers to the end near the axis of the screw 6 and the second end refers to the end away from the axis of the screw 6. For the insurance block 642 located relatively at the upper end, the first end of the insurance block 641 is the bottom end of the insurance block 641, and the second end is the top end of the insurance block 641. For the insurance block 642 located relatively at the lower end The first end of the insurance block 642 is the top of the insurance block 642, and the second end is the bottom end of the insurance block 642. The rotating blocks 3 correspond to the safety blocks 64 one by one.

When the safety device is in the first state, the safety block 64 rotates toward the distal end side of the first groove 721 without blocking the distal end of the rotation block 3 from moving to the second screw portion 62, that is, the connecting portion can be moved from the first state In the second state, when the safety device is in the second state, that is, when the safety block 64 is in the second state, the second end of the safety block 64 protrudes from the first groove 721 to guide the rotating block 3 to The first screw portion 61 moves, that is, the safety block 64 guides the connecting portion from the second state to the first state.

The state of the stapler in each stage is introduced below. Figures 24-28 show the state of the stapler when it is in the fail-safe mode, Figures 29-31 show the state of the stapler when it is in the firing mode; Figures 32-34 show the stapler from being fireable The state when the mode returns to the fail-safe mode; Figures 35 to 37 show the state when the stapler is reset after firing is completed.

As shown in FIGS. 24 to 28, a schematic view of the circular tube-type stapler of this embodiment in an initial state is shown. At this time, the circular tube-type stapler is in a fail-safe mode, and the connecting part is in the first state. Specifically, in the initial state where the staple cartridge assembly 12 and the anvil assembly 13 have just been docked successfully or the tissue has just been incorporated, the safety block 64 does not contact the rotating block 3, and the second end of the safety block 64 protrudes from First groove 721. The rotating block 3 is located in the first screw portion 61, the distal end 31 of the rotating block 3 is in contact with the first screw portion 61, and the proximal end 82 of the rotating block 3 is flared outward with respect to the screw 6, A cavity 321 is formed between the rotating block 3 and the screw 6. At this time, if the handle is held to move the firing rod 4 from the proximal end of the stapler to the distal direction, the distal end of the firing rod 4 enters the cavity between the proximal end of the rotating block 3 and the screw rod 6. Therefore, the firing rod 4 and the rotating block 3 are not linked. At this time, even if the operator accidentally pushes the handle 7 to push the firing rod 4, the firing rod 4 cannot drive the push rod 2 to move to the distal end, and it will not cause the stapler Firing to avoid false firing when the anvil assembly 13 and the staple cartridge assembly 12 have not reached the proper position.

In this embodiment, the insurance block 64 is correspondingly provided with two upper and lower blocks: a first insurance block 641 and a second insurance block 642, the first insurance block 641 and the second insurance block 642 are rotatably mounted on the same insurance pin 622 In the first groove 721. The first groove of the first fuse block 641 and the first groove 721 of the second fuse block 642 are connected up and down. It can also be said that the two fuse blocks share a first groove 721. In other embodiments, the first fuse block 641 and the second fuse block 642 may be respectively provided with a first groove 721, the two first grooves 721 are not connected to each other, the first fuse block 641 and the second fuse block 642 A safety pin 622 is rotatably connected to the inside of the proximal end of the corresponding first groove 721 respectively. In other embodiments, if the number of rotating blocks 3 changes, the number of fuse blocks 64 may also change correspondingly. The first grooves 721 of each fuse block 64 may be connected or separate.

In this embodiment, the safety pin 622 is provided with a first torsion spring 623, and the anvil assembly 13 moves toward the proximal end when the operation is prepared, that is, when the screw 6 moves toward the proximal end of the stapler, the far side of the rotating block 3 When the end 31 pushes the second end of the safety block 64 toward the distal side of the first groove 721, the first torsion spring 623 is deformed. When the anvil assembly 13 and the staple cartridge assembly 12 reach the proper positions, the stapler fires , The rotating block 3 moves toward the distal end of the stapler to disengage from the fuse block 64, and the deformation recovery force of the first torsion spring 623 restores the fuse block 64 to the initial state, that is, the second end of the fuse block 64 is near the stapler The end rotates to protrude beyond the first groove 721. Specifically, the closing process when preparing for surgery, the state of the safety block 64 when the stapler is fired, and when the stapler is reset will be described in detail below.

The second end of the safety block 64 is provided with a second guide slope 643 inclined toward the first screw portion 61. After the stapler is fired, the rotary block 3 moves toward the proximal end of the stapler to reset, the distal end 31 of the rotary block 3 The distal end 31 of the rotary block 3 moves along the second guide slope 643 to interfere with the first screw portion 61. Therefore, the second guide slope 643 can better serve as a transition between the second screw portion 62 and the first screw portion 61 to guide the movement of the rotating block 3 toward the proximal end of the stapler.

A first guide slope 314 is provided at the end of the boss 313 of the rotating block 3. In the initial state, the first guide inclined surface 314 at the end of the boss 313 interferes with the first screw portion 61, and in this embodiment, the outer surface of the retracting block 65. In the initial state, since the proximal end 82 of the rotating block 3 rotates outward, the boss 313 has a certain inclination angle. If the first guide slope 314 is not provided, the contact between the end of the boss 313 and the retracting block 65 is point contact. By providing the first guide slope 314, in the initial state, the contact between the boss 313 and the retracting block 65 becomes a surface contact, thereby increasing the contact area between the end of the boss 313 and the first screw portion 61 , Improve the overall stability of the stapler in the initial state. In addition, during the reset process after the stapler is fired, the first guide slope 314 will contact the distal end of the retracting block 65 and push the retracting block 65 toward the proximal end side of the second groove 711. Without the first guide slope 314, the distal end 31 of the rotating block 3 and the distal end of the retracting block 65 would be point-to-point contact, which is very unstable. After adding the first guiding slope 314, the retracting block 65 can be better pushed to the proximal end.

Corresponding to the two rotating blocks 3, the distal end 41 of the firing rod 4 is provided with two opposing firing portions, and the firing portions are axially opposite to the proximal ends of the two rotating blocks 3 when folded inward Correspondingly, it can be linked with the rotating block 3 when the two rotating blocks 3 are folded inward. In order to improve the structural cooperation between the firing rod 4 and the screw rod 6, the firing rod 4 further includes a firing rod connecting part 43 between the firing parts, which is formed as an arc surface recessed outwardly with respect to the screw rod, the arc surface and the wire The shape of the outer surface of the rod 6 is adapted. It can be understood that, when the outer surface of the screw 6 is not a curved surface, the inner surface of the firing rod connecting portion 43 is also a non-arc surface corresponding to it, so that when the firing rod 4 moves to the distal end , Can be supported and guided, making the stapler's firing more stable.

29 to 31 show the structure diagram of the round tube-type stapler of the present invention when the anvil assembly and the staple cartridge assembly reach the proper position during the operation. At this time, the stapler is in the normal firing mode, and the connecting portion is in the second status. When preparing for the operation, the operator turns the proximal knob 51 to drive the screw 6 toward the proximal end of the stapler. During the movement of the screw 6, the rotating block 3 contacts the fuse block 64, and then A thrust toward the distal end of the stapler, so the distal end 31 of the rotating block 3 pushes the second end of the safety block 64 to the distal end of the first groove 721 in the third state to achieve the safety block 64 to the rotating block 3 avoidance, and the first torsion spring 623 is torsionally deformed. Since the distal surface 655 and the outer surface 656 of the retracting block 65 are perpendicular to each other, when the screw rod 6 moves toward the proximal end, there is no transition surface, and when the rotating block 3 and the retracting block 65 are detached, they will suddenly and simply Earthly. When the distal end 31 of the rotating block 3 is located in the second screw portion 62, since the outer diameter of the second screw portion 62 is smaller than the outer diameter of the first screw portion 61, the proximal end 82 of the rotating block 3 is twisted The restoring force of the spring 312 is retracted inwardly with respect to the screw rod 6 so as to at least partially enter the path where the firing rod 4 moves from the proximal end to the distal end. When holding the handle 7 and firing the stapler, the firing rod 4 moves from the proximal end to the distal end of the stapler, interlocking with the rotating block 3. During the firing process, when the distal end of the rotating block 3 moves relatively to the second screw portion 62, the distal end 31 of the rotating block 3 can cross the fuse block 64 and collide with the second screw portion 62, or can pass the fuse block 64 and hang in the air. , That is, the outer diameter of the second screw portion 62 can be designed to be smaller, or the distal end 31 of the rotating block 3 and the second end of the safety block 64 are in conflict, etc., all of which can realize the proximal end 82 of the rotating block 3 The purpose of gathering inward. Preferably, the proximal end of the rotating surface and the distal end of the firing rod oppose each other, and, when resisting, the abutting surface is perpendicular to the axis direction to prevent non-operation during firing The mutual guiding action of the vertical resisting surfaces causes an increase in the firing force during anastomosis.

When the pointer 53 is used as the position indication of the anvil assembly in the stapler, when the pointer 53 is located in the first position area, the distal end 31 of the rotating block 3 interferes with the first screw portion 61 having a larger outer diameter, and the rotating block 3 The proximal end 82 of the splayed to the outside without interlocking with the firing rod 4, the stapler is in the fail-safe mode, and even if the handle 7 is held, the stapler will not be fired at this time. When the pointer 53 is pulled by the pull tab 52 and enters the second position area, the distal end 31 of the rotating block 3 is located at the second screw portion 62 with a smaller outer diameter, and the proximal end 82 of the rotating block 3 is folded inwardly to The firing rod 4 is linked, and the stapler is in a normal firing mode. At this time, if the handle 7 is held, the stapler can be fired normally.

When the stapler is fired, the rotating block 3 moves toward the distal end of the stapler until the rotating block 3 is separated from the fuse block 64. The rotating block 3 comes to the distal side of the fuse block 64. The second end of the fuse block 64 is lost due to In response to the force of the rotating block 3, it returns to the fourth state under the action of the first torsion spring 623, that is, the second end of the safety block 64 rotates toward the proximal section of the stapler to protrude beyond the first groove 721.

In the state of FIGS. 29 to 31, the stapler is already in a fireable mode, the connecting portion is in the second state, and the proximal end 82 of the rotating block 3 is retracted inward relative to the screw 6, at this time, if you hold the handle 7, you can sequentially The stapler is fired by the firing rod 4, the rotating block 3 and the nail push rod 2. In this state, if the operator finds that the surgical preparation is not perfect or there are other special circumstances that need to be returned to the fail-safe mode, then this function can be achieved through the retraction block 65. For example, at this time, the operator needs to increase the distance between the staple cartridge assembly 12 and the anvil assembly 13, that is, the knob 311 will be rotated in the opposite direction, at this time, the screw 6 moves to the distal end, and the retracting block 65 It will be pushed to the proximal end by the rotating block 3, and at the same time, the back pressure spring 612 will be compressed.

Specifically, as shown in FIGS. 32 to 34, it is a schematic diagram of a matching part of the push nail assembly and the screw rod when the stapler according to an embodiment of the present invention returns from the firable mode to the fail-safe mode. In the fireable mode, the boss 313 of the distal end 31 of the rotating block 3 is located between the retracting block 65 and the safety block 64. At this time, it is only necessary to rotate the knob 51 in the second direction, the second direction is opposite to the first direction, the screw 6 re-drives the anvil axially to move the distal end of the stapler in the opposite direction, and the first end of the pointer 53 returns to the first position area . At this time, the first guiding slope 314 of the distal end 31 of the rotating block 3 is in contact with the distal end of the retracting block 65, and the rotating block 3 gives the retracting block 65 a thrust in the proximal direction of the stapler through the first guiding slope 314 , So that the retracting block 65 moves toward the proximal end side of the second groove 711. The retracting spring 612 is compressed by the retracting block 65 and deformed. As the distal end 31 of the rotating block 3 moves toward the proximal end of the stapler, the proximal end 82 of the rotating block 3 gradually expands outward relative to the screw 6 and the stapler returns to the fail-safe mode again. The firing lever 4 is not linked.

After the stapler is fired, the push pin assembly will move to the proximal end under the action of the reset structure, that is, during this process, the rotating block 3 will also move toward the proximal direction, when passing the safety block 6, it will follow the safety The first guiding slope 643 of the block is gradually expanded to form the cavity 321, at this time the safety block 64 is in the fourth state, and the connection part will always be in the first state, the firing rod 4 is not linked with the connection part, the stapler It is in a disabled state and cannot be fired.

As shown in FIGS. 35 to 37, after the firing of the stapler of this embodiment is completed, the structure of the part that cooperates with the screw when the push nail assembly is reset, and the connecting portion is in the first state. When the push pin assembly is reset, the safety device is in the second state, and the rotating block 3 is reset toward the proximal end of the stapler. The distal end 31 of the rotating block 3 first interferes with the safety block 64. In this embodiment, the safety block 64 Both ends are provided with a first guide slope 643 toward the first screw portion 61, and the rotary block 3 moves along the first guide slope 643 in the proximal direction of the stapler. As the outer diameter of the screw 6 of the portion where the distal end 31 of the rotating block 3 abuts becomes larger and larger, the proximal end 82 of the rotating block 3 will gradually expand outward, so that the firing rod 4 and the rotating block 3 become Not linked, that is, the stapler is still in the fail-safe mode. If you accidentally hold the handle 7 and push the firing rod 4, the firing rod 4 will still enter the cavity 321 between the rotating block 3 and the screw rod 6, thereby avoiding the doctor After the firing of the tissue is completed, the firing again causes damage.

In addition, when the distance between the anvil assembly and the staple cartridge does not reach the proper position, the connecting portion is in the first state, and the firing rod and the connecting portion are not linked, at this time, it will not cause false firing of the stapler, when the anvil assembly moves When it is in a proper position, the connection part is in the second state, and the firing rod and the connection part are linked. At this time, it can be fired normally. During the reset process after the firing, the safety device is in the second state and guides the connection part to enter the first state again. Before the preparation for the next operation is completed, the connecting portion is always in the first state, and the stapler cannot be fired again; therefore, the present invention prevents false firing when the operation is not prepared, and effectively prevents The second firing when the nail cartridge that has been fired is not replaced, and at the same time, after the nail anvil assembly and the nail cartridge assembly reach the proper position, the doctor also needs to increase the distance between the nail anvil assembly and the nail cartridge assembly to provide the possibility to increase The safety of the use of equipment. At the same time, the transition of the connecting part between the first state and the second state is a direct transition, eliminating the uncertain fuzzy zone between the fireable state and the unfireable state of the stapler, and making the operation of the instrument safer.

Claims

A firing mechanism is characterized in that it is used for an stapler. The firing mechanism includes a push nail assembly, and the push nail assembly includes a firing rod, a connecting portion and a firing rod arranged in order from the proximal end to the distal end of the stapler A nail push rod, the connecting part is linked with the nail push rod, and the connecting part has a first state and a second state;

When the connecting portion is in the first state, the firing lever and the connecting portion are not linked, and the stapler cannot be fired; when the connecting portion is in the second state, the firing lever and the The connection part is linked, and the stapler can be fired.
The firing mechanism according to claim 1, wherein the connecting portion includes at least one rotating block, and the distal end of the rotating block is rotatably connected to the proximal end of the push rod;

When the connecting portion is in the first state, the proximal end of the rotating block is splayed outward; when the connecting portion is in the second state, the proximal end of the rotating block is folded inward.
The firing mechanism according to claim 2, further comprising a screw threaded inside the push nail assembly, the screw thread including a first screw portion and a second screw portion, the second The screw portion is located at the distal end of the first screw portion, and the outer diameter of the second screw portion is smaller than the outer diameter of the first screw portion; the distal end of the rotating block is located at the first In the case of the screw part, the proximal end of the rotating block flares outward; when the distal end of the rotating block is located in the second screw part, the proximal end of the rotating block is gathered inward.
The firing mechanism according to claim 3, wherein the inner wall of the distal end of the rotating block is provided with a boss, and when the connecting portion is in the first state, the boss of the rotating block and the The first screw portion is in conflict.
The firing mechanism according to claim 2, wherein the proximal end of the nail push rod is provided with a mounting groove corresponding to the rotating block one by one, and the distal end of the rotating block is rotatably connected by a rotating shaft Installed in the installation slot.
The firing mechanism according to claim 5, wherein a torsion spring is further provided on the rotating shaft, and the deformation restoring force of the torsion spring causes the distal end of the rotating block to gather inward relative to the screw rod .
The firing mechanism according to claim 4, wherein the end of the boss of the rotating block is provided with a first guide slope, and when the distal end of the rotating block is located in the first screw part, the The first guide slope at the end of the boss is in contact with the first screw portion.
The firing mechanism according to claim 3, wherein a screw connecting portion is further provided between the first screw portion and the second screw portion, and the outer surface of the screw connecting portion is a transition surface.
The firing mechanism according to claim 2, characterized in that two rotating blocks are provided at the proximal end of the nail push rod, and the two rotating blocks are arranged oppositely.
The firing mechanism according to claim 9, wherein the distal end of the firing rod is provided with two opposite firing parts, and the firing parts are respectively axially proximal to the proximal ends of the two rotating blocks when folded Corresponding.
The firing mechanism according to claim 3, wherein the firing mechanism further includes a safety device, the safety device includes a safety block corresponding to the rotating block one-to-one, and the proximal end of the second screw part A first groove corresponding to the fuse block is provided. The fuse block includes a first end and a second end. The first end of the fuse block is rotatably connected to the corresponding first groove. Proximal medial.
The firing mechanism according to claim 11, wherein the first end of the safety block is rotatably installed inside the proximal end of the first groove through a safety pin, and the safety pin is provided with a first A torsion spring, the deformation restoring force of the first torsion spring causes the safety block to rotate toward the proximal end of the stapler until it protrudes from the first groove.
The firing mechanism according to claim 11, wherein the proximal end of the push rod is provided with two first grooves communicating with each other, and the first ends of the two safety blocks pass through the same safety pin The first groove is rotatably installed.
The firing mechanism according to claim 11, wherein the second end of the safety block is provided with a first guide slope inclined toward the first screw portion.
The firing mechanism according to claim 1, wherein the firing mechanism further includes a retracting device, the connecting portion is in the second state, and the retracting device enters the third state from the third state In the fourth state, the connection part is guided from the second state to the first state.
The firing mechanism according to claim 15, further comprising a screw threaded inside the push nail assembly, the screw thread including a first screw portion and a second screw portion, the second The screw portion is located at the distal end of the first screw portion.
The firing mechanism according to claim 16, wherein the retracting device includes a retracting block, a second groove is opened at a distal end of the first screw portion, and the retracting block is disposed at the In the second groove.
The firing mechanism according to claim 17, wherein the outer surface of the retractable block and the distal surface of the retractable block are perpendicular to each other.
The firing mechanism according to claim 17, wherein a stepped portion is provided on a distal end side of the first groove, the stepped portion defines a distal position of the retracting block.
The firing mechanism according to claim 19, wherein a distal end of the retracting block is provided with a driving part and a limiter, the limiter cooperates with the stepped part to define the retracting In the distal position of the block, the driving portion protrudes toward the distal end of the stapler relative to the limit portion.
The firing mechanism according to claim 17, wherein the diameter of the second screw portion is smaller than the diameter of the first screw portion;

The connecting portion includes at least one rotating block, and the rotating block corresponds to the retracting block in one-to-one relationship. The distal end of the rotating block is rotatably connected to the proximal end of the nail push rod.
The firing mechanism according to claim 21, wherein the inner wall of the distal end of the rotating block is provided with a boss,

A first guide slope is provided at the end of the boss of the rotating block.
An anastomat is characterized by comprising the firing mechanism according to any one of claims 1 to 22.