CN111317535A - Tubular Stapler - Google Patents

Abstract

The invention provides a circular tube type anastomat which comprises an anastomat body, wherein the anastomat body comprises a nail pushing sheet, a nail pushing rod and a nail anvil shaft, the nail anvil shaft sequentially penetrates through the nail pushing sheet and the nail pushing rod, and the nail anvil shaft comprises a first nail anvil shaft part with a smaller outer diameter at the far end and a second nail anvil shaft part with a larger outer diameter at the near end. By adopting the stapler, when the distance between the nail anvil component and the nail bin does not reach a proper position, the distal end of the firing piece on the nail pushing piece is positioned on the second nail anvil shaft part, the nail pushing rod and the nail pushing piece are not linked, even if the operating handle is held, the nail pushing rod cannot push the nail pushing piece, the stapler cannot be fired, and only when the nail anvil component moves to a proper position relative to the nail bin, the nail pushing rod is linked with the nail pushing piece, and the nail pushing rod can push the nail pushing piece to fire the stapler; therefore, on the premise of ensuring normal work, the false firing when the operation is not prepared is prevented, and the use safety of the instrument is improved.

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, before firing the stapler, it is necessary to rotate the knob to make the distance between the anvil assembly and the staple cartridge reach an appropriate distance, no matter in tumor surgery or hemorrhoid treatment. 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 circular tube type stapler, the circular tube type stapler includes a stapler body, and the stapler body includes a nail push rod, a nail push piece and a nail that are sequentially arranged from the proximal end to the distal end thereof a cartridge assembly, the nail pushing piece includes at least one firing piece;

The stapler body further includes an anvil shaft, which is successively penetrated through the nail pushing piece and the nail pushing rod, and the anvil shaft includes a first anvil shaft part disposed at the distal end of the anvil shaft; a second anvil shaft part disposed at its proximal end, the outer diameter of the first anvil shaft part is smaller than the outer diameter of the second anvil shaft part, and the anvil shaft can be along the axis of the stapler to move;

When the distal end of the firing piece is located at the shaft portion of the second anvil, the push rod is not linked with the firing piece, and the stapler cannot be fired; the distal end of the firing piece is located at the first anvil When the shaft portion is positioned, the push rod is linked with the firing piece, and the stapler can be fired.

Optionally, the inner wall of the distal end of the firing piece is provided with a boss, and the boss of the firing piece is in contact with the anvil shaft.

Optionally, the nail pushing piece further includes a nail pushing portion, the distal end of the firing piece is connected with the proximal end of the nail pushing portion, and the distal end of the firing piece is an elastic portion.

Optionally, when the distal end of the firing piece is located at the shaft portion of the second anvil, the proximal end of the firing piece is opened axially outward of the anvil to form a cavity with the anvil shaft, When the push rod moves from the proximal end of the stapler to the distal direction, it enters the cavity;

When the distal end of the firing piece is located at the shaft portion of the first anvil, the proximal end of the firing piece is retracted axially inward relative to the anvil, and is linked with the proximal end of the firing piece.

Optionally, the proximal end of the firing piece includes a first matching portion, and the distal end of the nail push rod includes a second matching portion, and when the proximal end of the firing piece is retracted axially inward with respect to the nail anvil, The first fitting portion is fitted with the second fitting portion.

Optionally, the first matching portion includes a protrusion facing the anvil shaft, the second matching portion includes a groove corresponding to the protrusion, and the proximal end of the firing piece is opposite to the When the nail anvil is retracted axially inward, the protrusion of the firing piece is embedded in the groove of the nail push rod.

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 facing outward, the first matching portion includes a groove corresponding to the protrusion, and the proximal end of the firing piece is axially relative to the anvil When the inner side is folded, the protrusion of the nail push rod is embedded in the groove of the firing piece.

Optionally, a connecting portion is provided between the first anvil shaft portion and the second anvil shaft portion, and a surface of the connecting portion is a transition surface.

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 along the axial direction of the stapler.

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 an appropriate position, the distal end of the firing plate on the staple pushing plate is sleeved on the second staple anvil with a relatively large outer diameter. On the shaft, the push rod and the push piece are not linked at this time. Even if the operating handle is grasped, the push rod will not push the push piece, and the stapler will not be fired by mistake. When the nail cartridge is moved to the proper position, the distal end of the firing piece is sleeved on the shaft of the first anvil with the smaller outer diameter, and the nail push rod is linked with the nail push piece. The nail pusher can be pushed for firing; therefore, under the premise of ensuring the normal operation of the nail pusher rod and the nail pusher, the present invention prevents misfire when the operation is not ready, and improves the safety of the instrument.

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;

Fig. 5 is the enlarged view of A place in Fig. 4;

FIG. 6 is a schematic structural diagram of a nail push piece according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of the cooperation of the nail push piece and the nail push rod in an initial state according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of the cooperation of the nail push piece and the nail push rod in a failsafe mode according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of a nail push rod and a nail push piece linked together according to an embodiment of the present invention.

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 The firing piece 61 The shaft of the first anvil

321 Boss 62 Second anvil shaft

322 Protrusion 63 Connection

4 Pusher lever 7 Operating handle

41 Groove 8 Anvil Assembly

42 Proximal end of push rod 81 Anvil

51 Knob 82 Anvil Shaft Connector

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 push pins arranged in sequence from the proximal end to the distal end A rod, a staple pushing piece and a staple cartridge assembly, the stapler body further includes a staple anvil shaft disposed from the proximal end to the distal end of the stapler body, the staple pushing piece includes at least one firing piece, and the staple anvil shaft is in turn The anvil shaft includes a first anvil shaft part located at the distal end of the nail anvil shaft and a second nail anvil shaft part located at the proximal end of the nail anvil shaft; The outer diameter of the first anvil shaft portion is smaller than the outer diameter of the second anvil shaft portion, and the anvil shaft can move along the axial direction of the stapler.

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.

When the distal end of the firing piece is located at the shaft portion of the second anvil, the push rod is not linked with the firing piece, and the stapler cannot be fired;

When the distal end of the firing piece is located at the shaft portion of the first anvil, the push rod is linked with the firing piece, and the stapler can be fired.

Specifically, in an embodiment of the present invention, when the anvil assembly of the cylindrical stapler and the stapler body have just been successfully docked in the initial state, the distance between the anvil assembly and the staple cartridge is relatively large. The distance between the assembly and the staple cartridge does not reach an appropriate position, the distal end of the firing piece is sleeved on the shaft portion of the second anvil, and the proximal end of the firing piece is opened axially outward relative to the anvil to be in contact with the second anvil. The anvil shaft forms a cavity, and when the push rod moves from the proximal end of the stapler to the distal direction, it enters the cavity formed by the proximal end of the firing piece, and the action force of the handle cannot be acted on by the firing rod. to the pusher piece, so the pusher rod and the pusher piece with the firing piece are not linked. At this time, even if the operator accidentally presses the handle to fire the pusher rod, it will not cause the stapler to be fired, thus avoiding the need for surgery. Misfire when not ready to finish.

In preparation 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 distal end of the firing piece moves from the anvil assembly to the proximal end of the stapler. The second anvil shaft portion moves to the position of the first anvil shaft portion, the proximal end of the firing piece is retracted axially inward relative to the anvil, and the push rod moves from the proximal end of the stapler to the distal direction When it is in contact with the proximal end of the firing piece, it is 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, during the linkage, the force of the handle can be transmitted to the nail pushing piece through the firing rod, so that the nail pushing piece can move to the distal end.

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 , and the nail push piece 3 is located at the distal end of the nail push rod 4 . When the push rod 4 is linked with the push piece 3, the movement of the push rod 4 to the distal end of the stapler can drive the push piece 3 to move toward the distal end of the stapler. When the push piece 3 moves to 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 further includes an anvil shaft 6 disposed from the proximal end to the distal end, and the anvil shaft 6 is passed through the nail push rod 4 and the nail push piece 3 . In one type of cylindrical stapler, the anvil assembly 8 includes an anvil shaft connector 82 and an anvil 81 disposed at the distal end of the anvil shaft connector 82. The proximal end of the anvil shaft connector 82 can be 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 connecting member 82 can drive the staple anvil 81 to move along the axial direction of the staple anvil shaft connecting member 82 , so that the staple anvil assembly 8 is close to or away from the staple cartridge assembly 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 first position area and a second 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 first position area and the second 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 first position area to the second position area. In practice, the first 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 first 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 second position area, the operator is allowed to fire the stapler, so the second 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. 5 , in this embodiment, the anvil shaft 6 includes a first anvil shaft portion 61 and a second anvil shaft portion 62 , the first anvil shaft portion 61 is located at the distal end of the anvil shaft 6 , the The two anvil shaft portions 62 are located at the proximal end of the anvil shaft 6 . And the outer diameter D1 of the first anvil shaft portion 61 is smaller than the outer diameter D2 of the second anvil shaft portion 62 . As shown in FIG. 6 , the nail pushing piece 3 includes a nail pushing portion 31 located at the distal end of the nail pushing piece 3 and at least one firing piece 32 located at the proximal end of the nail pushing piece 3 . The distal end of the firing piece 32 is connected with the proximal end of the push pin portion 31 . In this embodiment, the nail push portion 31 and the firing piece 32 are integrally formed, but the present invention is not limited thereto. 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 area where the first anvil shaft portion 61 and the second anvil shaft portion 62 meet is the area A in FIGS. 4 and 5 .

Since the outer diameter D1 of the first anvil shaft portion 61 is smaller than the outer diameter D2 of the second anvil shaft portion 62 , the distal end of the firing piece 32 is sleeved on the first anvil shaft portion 61 and sleeved on the second anvil shaft portion 61 . There are different states when the anvil shaft portion 62 is on. As shown in FIG. 5 , in this embodiment, a connecting portion 63 may be further included between the first anvil shaft portion 61 and the second anvil shaft portion 62 , and the surface of the connecting portion 63 is directed toward the The transition slope of the second anvil shaft portion 62 is inclined. The connecting portion 63 can well guide the push piece 3 to move between the first anvil shaft portion 61 and the second anvil shaft portion 62 . The connecting portion 63 is not limited to an inclined surface, and can also be other shapes that can achieve a transition function, such as an arc surface and the like.

7 to 9 (the anvil is omitted in the drawings), respectively, when the distal end of the firing blade 32 is sleeved on the first anvil shaft 61 and the second anvil shaft 62, the stapler will be status.

As shown in FIG. 7 , at this time, the area A where the first anvil shaft portion 61 and the second anvil shaft portion 62 meet is located on the left side of the nail pushing piece 3 . When the distal end of the firing piece 32 is sleeved on the second anvil shaft portion 62, since the outer diameter D2 of the second anvil shaft portion 62 is larger, the firing piece 32 is stretched, and the proximal end of the firing piece 32 is stretched. Open to the outside with respect to the anvil shaft 6 . In this embodiment, the distal end of the firing piece 32 is further provided with a boss 321 facing the axial center of the anvil shaft 6 . Spread out.

As shown in FIG. 8 , in the state of FIG. 7 , if the push rod 4 moves from the proximal end of the stapler to the distal direction, the push rod 4 will enter the proximal end of the firing piece 3 and the anvil shaft The cavity between 6, that is, the fail-safe mode at this time, even if the operator accidentally presses the handle 7 and pushes the push rod 4 to move from the proximal end of the stapler to the distal direction, it will not push the push piece 3 This in turn fires the stapler, creating a failsafe state.

As shown in FIG. 9 , compared with the state of FIG. 7 , the anvil shaft 6 moves toward the proximal end of the stapler body relative to the stapler body, and at this time the first anvil shaft portion 61 and the second anvil shaft portion 62 The bordered area A enters the inside of the pusher piece 3 . The distal end of the firing piece 32 comes from the second anvil shaft portion 62 to the first anvil shaft portion 61, and the boss 321 at the distal end of the firing piece 32 is in contact with the first anvil shaft portion 61. The outer diameter D1 of an anvil shaft portion 61 is relatively small, and the proximal end of the firing piece 32 is retracted inward relative to the anvil shaft 6 and enters the path where the push rod 4 moves from the proximal end to the distal end, so When the push rod 4 moves from the proximal end of the stapler to the distal direction, it contacts with the proximal end of the firing piece 32 and is linked with the firing piece 32. At this time, the handle 7 is pressed to pass the push rod. 4. Drive the staple push piece 3 to complete the firing of the stapler.

In this embodiment, the part where the distal end of the firing piece 32 is connected to the nail pushing part 31 is an elastic part, so as to realize the opening and closing of the proximal end of the firing piece 32 relative to the anvil shaft 6 . Alternatively, the distal end of the firing piece 32 can be pivotally connected to the proximal end of the push pin portion 31 , that is, the distal end of the firing piece 32 can rotate relative to the proximal end of the push pin portion 31 around the axis of rotation, so as to realize the Opening and retracting of the proximal end relative to the anvil shaft 6 . The connection between the firing piece 32 and the nail push portion 31 can be connected in other ways, which all fall within the protection scope of the present invention. It can be understood that the staple pushing piece 3 has a certain strength as a whole, so as to stably transmit the force and realize the firing of the stapler.

In this embodiment, if the pointer 53 is used to indicate the position of the anvil shaft 6, when the first end of the pointer 53 is located in the first position area, the distal end of the firing piece 32 is sleeved on the second anvil The shaft portion 62, the stapler is in a fail-safe state at this time; when the first end of the pointer 53 moves from the first position area to the second position area, the anvil shaft 6 faces the proximal direction of the stapler body Move, so that the distal end of the firing piece 32 moves from the second anvil shaft portion 62 to the first anvil shaft portion 61, and at this time, if the handle 7 is pressed, the stapler can be normally fired.

There are many ways for the proximal end of the firing piece 32 to cooperate with the distal end of the push rod 4 . In this embodiment, the proximal end of the firing piece 32 includes a first matching portion, the distal end of the push rod 4 includes a second matching portion, and the proximal end of the firing piece 32 is opposite to the anvil shaft 6 When folded inwardly, the first matching portion is fitted with the second matching portion, so as to realize the linkage between the nail push rod 4 and the firing piece 32 and even the nail push piece 3 .

In this embodiment, the first matching portion includes a protrusion 322 facing the anvil shaft 6 , the second matching portion includes a groove 41 corresponding to the protrusion 322 , and the firing piece 32 When the proximal end of the nail is retracted inward relative to the nail anvil shaft 6 , the protrusion 322 of the firing piece 32 is embedded in the groove 41 of the nail push rod 4 . The groove 41 at the distal end of the push rod 4 may include a plurality of grooves 41 corresponding to the firing plate 32 one-to-one, and each groove 41 may be slightly larger than the protrusion 322 of the firing plate 32 . . In other embodiments, the groove 41 at the distal end of the push rod 4 can be directly set as a concave ring surrounding the push rod 4 .

In other embodiments, the second matching portion may also include a protrusion facing outward, 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 proximal end of the firing piece is retracted axially inward relative to the nail anvil, the protrusion of the nail pushing rod is embedded in the groove of the firing piece.

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 distal end of the firing piece is sleeved on the second staple anvil shaft portion with a relatively large outer diameter, The proximal end of the firing piece is stretched and separated from the nail push rod. At this time, the nail push rod and the nail push piece are not linked. Misfired, when the anvil assembly moves to a proper position relative to the staple cartridge, the distal end of the firing piece is sleeved on the shaft of the first anvil with the smaller outer diameter, and the proximal end of the firing piece is closed and in contact with the push rod The nail push rod and the nail push piece are linked together. At this time, if the operating handle is held, the nail push rod can push the nail push piece to fire; therefore, the present invention can prevent the nail push rod and the nail push piece from working properly under the premise of ensuring the normal operation of the nail push rod and the nail push piece. Misfired when surgery is not ready, improving the safety of instrument 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 (12)

1. The circular tube type anastomat is characterized by comprising 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, and the nail pushing sheet comprises at least one firing sheet;

the anastomat body further comprises a nail anvil shaft, the nail anvil shaft sequentially penetrates through the nail pushing sheet and the nail pushing rod, the nail anvil shaft comprises a first nail anvil shaft part arranged at the far end of the nail anvil shaft and a second nail anvil shaft part arranged at the near end of the nail anvil shaft, the outer diameter of the first nail anvil shaft part is smaller than that of the second nail anvil shaft part, and the nail anvil shaft can move along the axial direction of the anastomat;

when the distal end of the firing plate is positioned at the second nail anvil shaft part, the nail pushing rod is not linked with the firing plate, and the anastomat can not be fired; when the far end of the firing plate is positioned at the first nail anvil shaft part, the nail pushing rod is linked with the firing plate, and the anastomat can be fired.

2. The circular tube-type anastomat of claim 1, wherein the inner wall of the distal end of the firing plate is provided with a boss, and the boss of the firing plate is in contact with the anvil shaft.

3. The circular tube-type anastomat of claim 1, wherein the nail pushing plate further comprises a nail pushing portion, the distal end of the firing plate is connected with the proximal end of the nail pushing portion, and the distal end of the firing plate is an elastic portion.

4. The circular tube-type anastomat of claim 1, wherein when the distal end of the firing plate is located at the second anvil shaft portion, the proximal end of the firing plate opens outwardly relative to the anvil shaft to form a cavity with the anvil shaft, and the staple pushing rod enters the cavity when moving from the proximal end to the distal end of the anastomat;

when the far end of the firing plate is positioned on the first nail anvil shaft part, the near end of the firing plate is folded inwards relative to the nail anvil shaft and is contacted with the near end of the firing plate to be linked.

5. The circular tube-type anastomat of claim 4, wherein the proximal end of the trigger piece comprises a first matching portion, the distal end of the nail pushing rod comprises a second matching portion, and when the proximal end of the trigger piece is folded inwards relative to the anvil shaft, the first matching portion is embedded with the second matching portion.

6. The circular tube-type anastomat of claim 5, wherein the first matching portion comprises a protrusion facing the anvil shaft, the second matching portion comprises a groove corresponding to the protrusion, and when the proximal end of the trigger is folded inwards relative to the anvil shaft, the protrusion of the trigger is embedded in the groove of the nail pushing rod.

7. The circular tube-type stapler of claim 6, 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.

8. The circular tube-type anastomat of claim 6, wherein the groove at the distal end of the nail pushing rod is a concave ring surrounding the nail pushing rod.

9. The circular tube-type anastomat of claim 5, wherein the second matching portion comprises a protrusion facing outward, the first matching portion comprises a groove corresponding to the protrusion, and when the proximal end of the firing plate is folded inward relative to the anvil shaft, the protrusion of the nail pushing rod is embedded in the groove of the firing plate.

10. The circular tube-type anastomat of claim 1, wherein a connecting part is arranged between the first anvil shaft part and the second anvil shaft part, and the surface of the connecting part is a transition surface.

11. 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.

12. 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 along the axial direction of the anastomat through the screw rod assembly.

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