CN111317536A - Tubular Stapler - Google Patents

Abstract

The invention provides a cylindrical stapler, which includes a stapler body, the stapler body includes a staple cartridge assembly, a staple push piece, a staple push rod and a staple anvil shaft, the proximal end of the staple push piece is provided with a firing piece for firing The proximal end of the sheet is provided with a warped portion, and the nail anvil shaft is provided with a fixed portion. By adopting the present invention, when the distance between the nail anvil assembly and the nail cartridge does not reach an appropriate position, the fixing part matched with the firing piece is located in the first position area, and the nail push rod and the nail push piece are not linked, even if the operating handle is gripped , the nail push rod will not push the nail push piece, and will not cause false firing. When the nail anvil assembly moves to the appropriate position, the fixed part is located in the second position area, and the nail push rod can be linked with the nail push piece. Holding the operating handle, the nail push rod can push the nail push piece to fire; therefore, under the premise of ensuring the normal operation of the nail push rod and the nail push piece, the present invention prevents misfire when the operation is not ready, and improves the use of the instrument. safety.

Description

Tubular Stapler

technical field

The invention relates to the technical field of medical devices, in particular to a circular tube-type stapler.

Background technique

Digestive tract disease is one of the most common diseases in human beings. In the course of treatment, a cylindrical stapler is often used instead of a doctor's manual operation to anastomos physiological tissues such as the digestive tract. The tubular stapler is a common surgical instrument, most of which use axial inward binding to form end-to-end or end-to-side anastomosis on physiological tissues such as esophagus, stomach, and intestine during surgery. The segmental tissue is restrained and accommodated in the stapler, and after firing is completed, a circular anastomosis is formed on the tissue, and the human body passage is reconstructed.

In the prior art, a cylindrical stapler includes a stapler body, an operating handle movably connected to the stapler body, and an anvil assembly matched with the body. The stapler body includes a staple cartridge assembly at the distal end, the staple cartridge assembly includes an annular staple cartridge, a cutter; and a knob arranged at the proximal end of the body, the knob can be rotated relative to the body, and the stapler The interior of the body also includes an anvil shaft disposed from the proximal end to the distal end. The distal end and the proximal end here are relative to the operator, the end closer to the operator is the proximal end, and the end farther away from the operator, that is, the end closer to the surgical site is the distal end. In the stapler, the inner side and the outer side are relative to the axis of the stapler, the side close to the axis is the inner side, and the side away from the axis is the outer side. The anvil assembly includes an anvil, an anvil cap disposed at the distal end of the anvil, and a knife anvil disposed inside the anvil, and the anvil assembly can be directly connected with the distal end of the anvil shaft or through a connecting piece of the anvil shaft . In the process of tumor surgery, after the tumor tissue is cut off and removed, the anvil shaft passes through the purse of the stump tissue and is disposed at the distal end of the stapler body, and the knob is rotated to gradually reduce the distance between the anvil assembly and the staple cartridge. After reaching a suitable distance, the firing state can be achieved, and the operation handle can be held to fire the instrument to complete the anastomosis. With the continuous development of medical devices, tubular staplers are also more and more widely used in the treatment of hemorrhoids and other diseases.

As mentioned above, no matter in the operation of tumor treatment or the treatment of hemorrhoids, before firing the stapler, it is necessary to rotate the knob to make the distance between the anvil assembly and the staple cartridge reach a proper distance. However, when the cylindrical stapler is actually used for surgery, the operator may accidentally hold the operating handle when the distance between the staple anvil assembly and the staple cartridge does not reach an appropriate position, resulting in a false firing, resulting in the failure of the surgery. It may even lead to medical malpractice.

SUMMARY OF THE INVENTION

In view of the problems in the prior art, the purpose of the present invention is to provide a cylindrical stapler, when the distance between the staple anvil assembly and the staple cartridge does not reach an appropriate position, even if the operating handle is held, the staple push rod will not will push the pusher tab without false firing.

An embodiment of the present invention provides a cylindrical stapler, including a stapler body, wherein the stapler body includes a nail push rod, a nail push piece and a nail cartridge assembly sequentially arranged from the proximal end to the distal end of the staple pusher. The proximal end of the piece includes at least one firing piece, and the stapler body further includes a nail anvil shaft, which is passed through the nail pushing piece and the nail pushing rod in sequence, and the nail anvil shaft is arranged on the nail anvil shaft. There is a fixing part, the firing piece is penetrated between the fixing part and the anvil shaft, the fixing part can move between a first position area and a second position area, and the second position area is located at the proximal side of the first location region;

When the fixing part is located in the first position area, the push rod is not linked with the firing piece, and the stapler cannot be fired; when the fixing part is located in the second position area, the push nail The rod is linked with the firing tab, and the stapler can be fired.

Optionally, the fixing portion is a fixing ring surrounding the anvil shaft.

Optionally, at least one connecting block is provided on the fixing ring, the fixing ring is fixedly connected with the nail anvil shaft through the connecting block, the firing piece is at least two pieces, and the connecting block is located in the between the firing pieces.

Optionally, the fixing part includes a plurality of fixing pieces, the fixing pieces are in one-to-one correspondence with the firing pieces, and the proximal ends of the firing pieces are penetrated through the corresponding fixing pieces and the nails. between the anvil shafts.

Optionally, the proximal end of the firing piece is provided with a curved portion, and when the fixing portion is located in the first position region, the curved portion of the firing piece protrudes from the proximal end of the fixing portion and is not subject to the pressure of the fixing part and is lifted to the outside to form a cavity with the anvil shaft, and the push rod enters the cavity when it moves from the proximal end of the stapler to the distal direction;

When the fixing part is located in the second position area, the warped part enters between the fixing part and the nail anvil shaft and is compressed inward by the pressure of the fixing part; When the proximal end of the stapler moves to the distal end, it is in contact with the curved portion to be linked.

Optionally, the proximal end of the curved portion includes a first matching portion, and the distal end of the nail push rod includes a second matching portion. When the curved portion is folded inward, the The first matching portion is fitted in the second matching portion of the push rod.

Optionally, the first matching portion includes a protrusion disposed on the warped portion and facing the anvil shaft, the second matching portion includes a groove corresponding to the protrusion, the curved portion When the warped portion is retracted inwardly, the protrusion is embedded in the groove.

Optionally, the groove at the distal end of the push rod includes a plurality of grooves corresponding to the firing pieces one-to-one.

Optionally, the groove at the distal end of the push rod is a concave ring surrounding the push rod.

Optionally, the second matching portion includes a protrusion disposed on the push rod and facing outward, the first matching portion includes a groove corresponding to the protrusion, and the warped portion faces inward When folded, the protrusion is embedded in the groove.

Optionally, the warped portion is an elastic member.

Optionally, the stapler further includes an operating handle pivotally connected to the stapler body, and pressing the operating handle can drive the push rod to move from the proximal end of the stapler to the distal direction.

Optionally, the stapler body further includes a knob located at the proximal end of the stapler body, the knob is connected with the proximal end of the anvil shaft through a rod assembly, and when the knob is rotated, the knob is passed through the knob. The screw assembly drives the anvil shaft to move axially relative to the stapler body.

The cylindrical stapler provided by the present invention has the following advantages:

The invention provides a cylindrical stapler. When the distance between the staple anvil assembly and the staple cartridge does not reach a proper position, the fixing part that cooperates with the firing piece is located in the first position area. The pieces are not interlocked, even if the operating handle is held, the push rod will not push the push piece, and the stapler will not be fired by mistake. In the second position area, the push rod is linked with the push piece. At this time, if the operating handle is held, the push rod can push the push piece to fire the stapler. Therefore, the present invention ensures the normal operation of the push rod and the push piece. Under the premise of preventing the accidental firing when the operation is not ready, the safety of the instrument is improved.

Description of drawings

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

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

FIG. 2 is a schematic diagram of removing one side housing of the stapler according to an embodiment of the present invention;

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

4 is a schematic structural diagram of an anvil shaft according to an embodiment of the present invention;

5 is a schematic diagram of the cooperation between the nail push piece and the nail push rod in an initial state according to an embodiment of the present invention;

Fig. 6 is an enlarged view at A1 in Fig. 5;

FIG. 7 is a cross-sectional view of the cooperation of the nail push piece and the nail push rod in a fail-safe state according to an embodiment of the present invention;

Fig. 8 is an enlarged view at A2 in Fig. 7;

FIG. 9 is a schematic diagram of the cooperation between the nail push piece and the nail push rod in a normal working state according to an embodiment of the present invention;

10 is a cross-sectional view of the cooperation of the nail push piece and the nail push rod in a normal working state according to an embodiment of the present invention;

FIG. 11 is an enlarged view of A3 in FIG. 10 .

Reference number:

1 Stapler body housing 52 Screw assembly

2 Cartridge Assembly 53 Pointer

3 Push tab 54 Pull tab

31 Push nail 6 Anvil shaft

32 Firing Plate 61 Retaining Ring

321 Warped part 62 Connection block

322 Raised 7 Handles

4 Push rod 8 Anvil assembly

41 Groove 81 Anvil

42 Proximal end of push rod 82 Anvil shaft connection

51 Knob

Detailed ways

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments, however, can be embodied in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repeated descriptions will be omitted.

In order to solve the technical problems in the prior art, the present invention provides a circular-tube-type stapler, the circular-tube-type stapler includes a stapler body, wherein the stapler body includes a direction from the proximal end of the stapler body to the stapler body. A nail push rod, a nail push piece and a nail cartridge assembly are arranged in sequence at the distal end, the proximal end of the nail push piece includes at least one firing piece, and the stapler body also includes a nail anvil shaft, which is passed through in sequence In the nail pushing piece and the nail pushing rod, the nail anvil shaft is provided with a fixing part, the firing piece is penetrated between the fixing part and the nail anvil shaft, and the fixing part can be in the first position area and the second position area. Moving between location areas, the second location area is located on the proximal side of the first location area. When the stapler is in the initial state and has not reached the fireable state, the fixing portion is located in a first position area, and the first position area is close to the distal end of the stapler.

When the fixing part is located in the first position area, the push rod and the firing piece are not linked, and the stapler cannot be fired; when the fixing part is located in the second position area, the nail push rod and the The firing tabs are linked and the stapler can be fired.

Further, the stapler may further include a nail anvil assembly, the nail anvil assembly includes a nail anvil, the nail anvil may be connected to the distal end of the nail anvil shaft through the nail anvil shaft connector, and the nail anvil may also be directly connected to the distal end of the nail anvil shaft. end connection. When the anvil shaft moves in the axial direction of the stapler, the staple anvil assembly is driven to move along the axial direction of the stapler, so that the staple anvil assembly is away from or close to the staple cartridge.

In an embodiment of the present invention, the proximal end of the firing piece is provided with a warped portion, and the warped portion naturally opens outward relative to the anvil shaft when no external force is applied.

In the initial state when the anvil assembly of the cylindrical stapler and the stapler body are just successfully connected, the distance between the anvil assembly and the staple cartridge is relatively large, and the distance between the anvil assembly and the staple cartridge is not suitable at this time. position, the fixing part is located in the first position area closer to the distal end of the stapler, the curved part of the firing piece protrudes from the proximal end of the fixing part and is warped outward without being pressed by the fixing part A cavity is formed between it and the anvil shaft. When the push rod moves from the proximal end to the distal end of the stapler, it enters the cavity without linkage with the firing piece. At this time, even if the operator does not Carefully press the handle to fire the push rod, and it will not cause the stapler to fire, thus avoiding false firing when the surgery is not ready.

When preparing for surgery, the knob is rotated so that the anvil shaft drives the anvil assembly to move toward the proximal end of the stapler, and when the distance between the anvil assembly and the staple cartridge reaches an appropriate position, the fixing portion will move from the first position. The area moves to the second position area, the warped portion enters between the fixing portion and the nail anvil shaft and is compressed inwardly by the pressure of the fixing portion, and the push rod is from the proximal end of the stapler When moving to the distal end, it is in contact with the curved portion to be linked with the firing piece. At this time, if the operator presses the handle to fire the push rod, the stapler will be fired, thereby realizing the normal function of the stapler. That is, the force of the handle will be transmitted by the firing rod to the push rod, so that the instrument is fired.

The structure of the cylindrical stapler according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1 and FIG. 2, it is the structure of a stapler according to an embodiment of the present invention, wherein in order to show the internal structure of the stapler more clearly, in FIG. 2, one side of the stapler housing is removed, and the staples are The cartridge assembly is shown separate from the stapler body. The stapler includes a stapler body and an anvil assembly 8, the stapler body includes a stapler housing 1 and a staple cartridge assembly 2 at the distal end of the stapler housing 1, and the staple cartridge assembly 2 includes an annular staple cartridge and a cutter , the staple cartridge assembly 2 is provided with a nail push piece 3 and a nail push rod 4. When the nail push rod 4 is linked with the nail push piece 3, the movement of the nail push rod 4 to the distal end of the stapler can drive the nail push piece 3 to the far end of the stapler. When the staple pushing piece 3 moves toward the distal end of the stapler, the staples and the cutter in the staple cartridge assembly 2 can be pushed out to perform anastomosis and cutting of the tissue. The stapler body also includes an anvil shaft 6 disposed from the proximal end to the distal end, and the anvil shaft 6 is passed through the nail pushing rod 4 and the nail pushing piece 3 . The anvil assembly 8 includes an anvil shaft connecting piece 82 and an anvil 81 disposed at the distal end of the anvil shaft connecting piece 82 . The proximal end of the anvil shaft connecting piece 82 is connected with the distal end of the anvil shaft 6 . After the staple anvil assembly 8 is docked with the stapler body, the staple anvil shaft 6 can drive the staple anvil 81 to move along the axial direction of the staple anvil shaft 6 through the staple anvil shaft connector 82, so that the staple anvil assembly 8 is close to or away from the staple cartridge component 2.

Of course, in another type of tubular stapler, such as the aforementioned tubular stapler for hemorrhoid surgery, the staple anvil assembly 8 is directly connected to the stapler body, and the staple anvil assembly 8 cannot The anvil assembly 8 does not include the anvil shaft connecting piece 82 , and the anvil 81 is directly connected to the distal end of the anvil shaft 6 . The present invention is described by taking such a stapler as an example.

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 away from the operator, that is, the end closer to the operating position is the distal end. That is, in this embodiment, since the operator uses the handle to operate the stapler, in the perspectives of FIGS. 1 and 2 , the end deviating to the right is the proximal end, and the end deviating to the left is the distal end . For example, for the nail push rod 4, the proximal end 42 of the nail push rod 4 is the end that is offset to the right relative to the distal end of the nail push rod 4, and for the nail push piece 3, the proximal end of the nail push piece 3 is An end that is deviated to the right with respect to the distal end of the pusher piece 3 .

In this embodiment, the stapler further comprises an operating handle 7 pivotally connected to the stapler body, the distal end of the operating handle 7 corresponds to the proximal end of the push rod 4, and the operating handle 7 faces the stapler The rotation of the body can drive the push rod 4 to move from the proximal end of the stapler to the distal direction.

The proximal end of the stapler body is further provided with a knob 51 , and the knob 51 is connected with the proximal end of the anvil shaft 6 through the screw rod assembly 52 . When the knob 51 is rotated, the screw assembly 52 drives the anvil shaft 6 to move axially relative to the stapler body.

The structures of the cylindrical stapler shown in FIGS. 1 to 2 are only examples. In practical applications, the structure of the cylindrical stapler is not limited to the structure shown in the figures, and other forms can also be used to realize the stapler. The firing can be done, all belong to 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 54 located inside the stapler body, and the proximal end of the pull tab 54 is connected to the wire The rod assembly 52 is connected and can move along the axial direction of the screw rod with the movement of the screw rod assembly 52 . The distal end of the pull-tab 54 is opposite to the first end of the pointer 53, and the first end of the pointer 53 has a third position area and a fourth position area, where the first end of the pointer 53 refers to the The upper end of the pointer 53 in FIG. 3 . The pointer 53 is pivotally fixed on the stapler housing 1, and when the pointer 53 is rotated, its first end can move between the third position area and the fourth position area.

In this embodiment, when the knob 51 rotates in the first direction, the screw assembly 52 drives the pull tab 54 to move toward the proximal end of the stapler body, and the distal end of the pull tab 54 pulls the The first end of the pointer 53 moves from the third position area to the fourth position area. In practice, the third position area generally refers to the initial position area of the pointer 53. At this time, the distance between the staple cartridge assembly 2 and the staple anvil assembly 8 is far away and does not reach the proper position. Therefore, the third position area is also inaccessible. In the firing area, with the rotation of the knob 51 in the first direction, the anvil shaft 6 pulls the anvil 81 to move toward the stapler, so that the distance between the anvil 81 and the cartridge assembly 2 reaches an appropriate position, and the pointer 53 also Pulled by the pull tab 54 to the fourth position area, the operator is allowed to fire the stapler, so the fourth position area is also called the fireable area. Therefore, the pointer 53 can be used as an indication of the position of the anvil shaft 6 to indicate whether the stapler has been surgically prepared to allow firing.

The movement manner and the position indication manner of the anvil shaft 6 here are only examples, and are not intended to limit the present invention. For example, the axial movement of the anvil shaft 6 can be driven by other components, instead of the knob 51 and the screw assembly 52 of the present invention, and the position of the anvil shaft 6 is not necessarily indicated by the pointer 53, but can also be Other ways to indicate whether the anvil shaft 6 and the anvil 81 have reached the fireable position, or not by means of a visual indication.

In order to avoid misfire of the stapler when the anvil 81 is not moved to the proper position. The present invention further improves the nail anvil shaft 6 , the nail pushing piece 3 and the nail pushing rod 4 . As shown in FIG. 4 , the nail anvil shaft 6 is provided with a fixing part. In this embodiment, the fixing part is an annular fixing ring 61 . The fixing ring 61 is sleeved on the nail anvil shaft 6 . The fixing ring 61 The connecting block 62 is fixed on the anvil shaft 6. When the anvil shaft 6 moves toward the proximal end of the stapler, the fixing ring 61 can move together with the anvil shaft 6 from the first position area to the second position area.

As shown in Figures 5-8 (the anvil is omitted in the figure), at this time, the stapler is in the initial state where the staple anvil assembly 8 and the stapler body have just been connected successfully, and there is a large gap between the staple anvil assembly 8 and the staple cartridge assembly 2. The distance between the staple anvil assembly 8 and the staple cartridge does not reach a proper position, the fixing ring 61 is located in the first position area. The nail pushing piece 3 includes a nail pushing portion 31 located at the distal end of the nail pushing piece 3 and a firing piece 32 located at the proximal end of the nail pushing piece 3. The nail pushing portion 31 and the firing piece 32 may be integrally formed, but the present invention is not limited thereto. , which takes two separate parts, then a fixed connection is also possible. The number of the firing pieces 32 can be selected as required, for example, two, four, six, etc., all fall within the protection scope of the present invention. The proximal end of the firing piece 32 is provided with a warped portion 321, and the warped portion 321 is naturally open to the outside under the condition of no external force. Here, the outward open refers to the axis relative to the anvil shaft 6 Open to the outside.

In this embodiment, the warped portion 321 may be an elastic member, and has a shape that is bent outward in advance. When no external force is applied, the warped portion 321 maintains its initial shape and expands outward. When the pressure is applied, its shape can be changed according to the direction of the pressure. After the pressure is removed, the warped portion 321 can return to its original shape. In other embodiments, the warped portion 321 may not be an elastic member, but a member pivotally connected to the proximal end of the firing plate 32, and a reset mechanism is provided at the pivotal connection, and the reset mechanism can be a torsion spring , when the torsion spring is not deformed in the initial state, the warped portion 321 has a certain rotation angle relative to the firing plate 32, that is, it opens outward relative to the nail anvil shaft 6, and can be relative to the nail anvil when external force is applied. When the shaft 6 is folded inward, the torsion spring will be deformed at this time, and after the external force is removed, it can return to the initial state due to the restoring force of the torsion spring. It can be understood that, the staple pushing piece 3 has a certain strength as a whole, so as to transmit force effectively to fire the stapler.

When the fixing ring 61 is located in the first position area, the curved portion 321 protrudes from the proximal end side of the fixing ring 421 , ie, the right side in FIG. 5 , after passing through the cavity between the fixing ring 421 and the anvil shaft 6 . The warped portion 321 is naturally opened to the outside without the pressure of the fixing ring 421 . At this time, if the pusher rod 4 moves toward the distal end of the stapler, it will enter the cavity between the warped portion 321 and the anvil shaft 6, and will not drive the firing piece 32 and even the pusher piece 3 to fire the stapler . Therefore, at this time, the stapler is in a fail-safe state to avoid false firing when the staple anvil and the staple cartridge do not reach the proper position before the surgery is ready.

In this embodiment, the fixing portion is a fixing ring 61 surrounding the anvil shaft 6 . In other embodiments, the fixing portion may not be a ring-shaped structure, but may include a plurality of fixing pieces, the fixing pieces are in one-to-one correspondence with the firing piece, and the proximal end of the firing piece is pierced through the firing piece. between the corresponding fixing piece and the nail anvil shaft. When the fixing piece is in the first position area, the curved portion of each firing piece passes through the corresponding fixing piece and protrudes from the proximal end side of the corresponding fixing piece.

As shown in FIGS. 9 to 11 , at this time, the anvil shaft 6 moves further toward the proximal end of the stapler relative to the stapler body, and drives the fixing ring 61 to move from the first position area to the second position area. At this time, the anvil anvil moves The distance from the staple cartridge to the appropriate position. The curved portion 321 enters between the fixing ring 61 and the anvil shaft 6 and is compressed inwardly by the pressure of the fixing ring 61 , and the push rod 4 moves from the proximal end to the distal end of the stapler When moving in direction, after contacting with the warped portion 321 , it is linked with the firing piece 32 through the cooperation with the warped portion 321 . At this time, if the operator holds the handle 7 and fires the pusher rod 4 to move from the proximal end of the stapler to the distal end, it also pushes the pusher piece 3 to push out the staple cartridge and the cutter in the staple cartridge assembly 2 for tissue suturing and cutting. cut to achieve firing of the stapler.

In this embodiment, when the pointer 53 is used to indicate the positions of the anvil shaft 6 and the nail anvil 81, when the first end of the pointer 53 is located in the third position area, the fixing ring 61 is located in the first position area, the When the first end of the pointer 53 moves from the third position area to the fourth position area, the anvil shaft 6 moves toward the proximal end of the stapler body, so that the fixing ring 61 moves from the first position area to the fourth position area. The second location area moves. Therefore, the operator can judge whether a proper position is currently reached between the staple anvil 81 and the staple cartridge assembly 2 according to the position of the first end of the pointer 53 . When the first end of the pointer 53 reaches the fourth position area, the stapler can be fired by pressing the handle 7 to perform the operation, and when the first end of the pointer 53 reaches the third position area, even if the operator accidentally presses the handle 7. Since the stapler is in a fail-safe state, the staple pusher 3 will not be pushed to fire the stapler, thereby avoiding the operation failure caused by false firing.

There can be many ways of matching the curved portion 321 with the distal end of the push rod 4 . In this embodiment, the proximal end of the curved portion 321 includes a first matching portion, and the distal end of the push rod 4 includes a second matching portion. When the curved portion 321 is folded inward, the curved portion 321 The first matching portion of the upturned portion 321 is fitted into the second matching portion of the push rod 4, and enters the path where the push rod 4 moves from the proximal end to the distal end.

As shown in FIG. 11 , the first matching portion includes a protrusion 322 of the warped portion 321 facing the anvil shaft 6 , and the second matching portion includes a groove 41 corresponding to the protrusion 322 . , when the curved portion 321 is folded inwardly, the protrusion 322 of the curved portion 321 is embedded in the groove 41 of the push rod 4 . In this embodiment, the groove 41 at the distal end of the push rod 4 may include a plurality of grooves 41 corresponding to the firing pieces 32 one-to-one. The structure of the grooves 41 can be referred to in FIG. 6 . The protrusions 41 may be slightly larger than the protrusions 322 of the curved portion 321 . In other embodiments, the groove 41 at the distal end of the push rod 4 may also be a concave ring surrounding the push rod 4 .

In other embodiments, the second matching portion may also include a protrusion facing the outside of the nail push rod, and the first matching portion includes a groove corresponding to the protrusion. That is, compared with the previous embodiment, the protrusion is arranged on the push rod, and the groove is arranged on the firing piece. When the warped portion is folded inward, the protrusion of the nail push rod is embedded in the groove of the warped portion.

The cylindrical stapler provided by the present invention has the following advantages:

The present invention provides a cylindrical stapler. When the distance between the staple anvil assembly and the staple cartridge does not reach a proper position, the curved portion at the proximal end of the firing piece protrudes out of the fixing portion, and naturally occurs without external force. Open, so the warped part is separated from the nail push rod. At this time, the nail push rod and the nail push piece are not linked. Even if the operating handle is held, the nail push rod will not push the nail push piece, and will not cause false firing. , when the nail anvil assembly moves to a proper position relative to the nail cartridge, the warped portion at the proximal end of the firing piece enters the fixed portion and is compressed inward by the pressure of the fixed portion, and the warped portion thus cooperates with the nail push rod, so that the nail is pushed The rod is linked with the nail pusher. At this time, if the operating handle is held, the nail pusher can push the nail pusher to fire. Therefore, the present invention can prevent the operation when the operation is not ready under the premise of ensuring the normal operation of the nail pusher and the nail pusher. It can improve the safety of equipment use.

The above content is a further detailed description of the present invention in combination with specific preferred embodiments, and it cannot be considered that the specific implementation of the present invention is limited to these descriptions. For those of ordinary skill in the technical field of the present invention, without departing from the concept of the present invention, some simple deductions or substitutions can be made, which should be regarded as belonging to the protection scope of the present invention.

Claims (13)

1. A circular tube type anastomat comprises an anastomat body, wherein the anastomat body comprises a nail pushing rod, a nail pushing sheet and a nail bin assembly which are sequentially arranged from the near end to the far end of the anastomat body, the near end of the nail pushing sheet comprises at least one triggering sheet, the anastomat body further comprises a nail anvil shaft, and the nail anvil shaft sequentially penetrates through the nail pushing sheet and the nail pushing rod;

when the fixing part is positioned in the first position area, the nail pushing rod is not linked with the firing plate, and the anastomat cannot be fired; when the fixing part is located in the second position area, the nail pushing rod is linked with the firing piece, and the anastomat can be fired.

2. The circular tube-type anastomat of claim 1, wherein the fixing portion is a fixing ring surrounding the anvil shaft.

3. The circular tube-type anastomat as claimed in claim 2, wherein the fixing ring is provided with at least one connecting block, the fixing ring is fixedly connected with the nail anvil shaft through the connecting block, the number of the firing plates is at least two, and the connecting block is located between the firing plates.

4. The circular tube-type anastomat of claim 1, wherein the fixing portion comprises a plurality of fixing pieces, the fixing pieces correspond to the firing plates one by one, and the proximal ends of the firing plates penetrate between the corresponding fixing pieces and the anvil shaft.

5. The circular tube type anastomat of claim 1, wherein a bent portion is arranged at a proximal end of the firing plate, when the fixing portion is located in the first position area, the bent portion of the firing plate extends out of the proximal end of the fixing portion and is not pressed by the fixing portion to be bent outwards to form a cavity with the anvil shaft, and when the nail pushing rod moves from the proximal end to the distal end of the anastomat, the nail pushing rod enters the cavity;

when the fixing part is located in the second position area, the warping part enters the fixing part and the nail anvil shaft and is drawn in to the inner side under the pressure of the fixing part, and the nail pushing rod is in contact with the warping part to be linked when moving from the near end to the far end of the anastomat.

6. The circular tube-type anastomat of claim 5, wherein the proximal end of the warped portion comprises a first mating portion, the distal end of the push rod comprises a second mating portion, and when the warped portion is folded inwards, the first mating portion of the warped portion is fitted into the second mating portion of the push rod.

7. The circular tube-type anastomat of claim 6, wherein the first matching portion comprises a protrusion arranged on the warped portion and facing the anvil shaft, the second matching portion comprises a groove corresponding to the protrusion, and when the warped portion is folded inwards, the protrusion is embedded in the groove.

8. The circular tube-type stapler of claim 7, wherein the recess of the distal end of the staple pushing rod comprises a plurality of recesses corresponding to the firing plates one to one.

9. The circular tube-type anastomat of claim 7, wherein the groove at the distal end of the nail pushing rod is a concave ring surrounding the nail pushing rod.

10. The circular tube-type anastomat of claim 6, wherein the second matching portion comprises a protrusion which is arranged on the nail pushing rod and faces outwards, the first matching portion comprises a groove corresponding to the protrusion, and when the warped portion is folded inwards, the protrusion is embedded in the groove.

11. The circular tube-type anastomat of claim 5, wherein the warped portion is an elastic member.

12. The circular tube-type stapler according to claim 1, wherein the stapler further comprises an operating handle pivotally connected to the stapler body, wherein pressing the operating handle drives the pusher rod to move from a proximal end of the stapler to a distal end.

13. The circular tube-type anastomat of claim 1, wherein the anastomat body further comprises a knob located at the proximal end of the anastomat body, the knob is connected with the proximal end of the nail anvil shaft through a screw rod assembly, and when the knob rotates, the nail anvil shaft is driven to move axially relative to the anastomat body through the screw rod assembly.

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