CN222110092U - Nail head and surgical stapler - Google Patents

Abstract

The present application provides a nail head and a surgical stapler, the nail head comprising: a first clamp and a second clamp arranged opposite to each other, a jaw being formed between the two, at least one fixing pin being provided at the proximal end of the second clamp; a spring sheet, the sheet comprising a bending portion, a connecting portion and a supporting portion, the bending portion being provided with a positioning hole, the fixing pin being passed through the positioning hole, the supporting portion being located on the side of the bending portion facing the first clamp, and the connecting portion being connected between the bending portion and the supporting portion; wherein when the first clamp is not subjected to an external force, the supporting portion of the spring sheet abuts against the first clamp, and the spring sheet is configured to apply a biasing force to the first clamp to make it away from the second clamp, so that the jaw is opened; when the first clamp is subjected to an external force, the first clamp compresses the spring sheet to deform, and the jaw is closed. The present application can keep the jaw of the nail head open in the initial state, and the installation process is simple and the structure is stable.

Description

Nail head and surgical stapler

Technical Field

The application relates to the technical field of medical appliances, in particular to a nail head and a surgical anastomat.

Background

Surgical staplers typically include a stapler body, a cartridge assembly and an anvil disposed at a distal end of the stapler body. When the anastomat is triggered, a triggering assembly in the anastomat body moves in the distal direction, and the triggering assembly can drive the nail bin assembly and the nail anvil to suture and cut tissues. As disclosed in the prior patent CN208851552U, in the initial state, the cartridge assembly and the anvil are in a relatively opened state, and a compression spring is disposed on the cartridge assembly, and the open state of the jaw is maintained by the compression spring abutting against the anvil. However, the existing structure adopting the compression spring is not high in stability, if the compression spring is to be firmly fixed, the structure and the installation process are complex, and if the compression spring moves in position, the stability of opening the jaw is affected, and even the smoothness of the closing process of the jaw is possibly affected.

Disclosure of utility model

Aiming at the problems in the prior art, the application aims to provide a nail head and a surgical stapler, wherein a jaw for keeping the nail head is opened in an initial state, the mounting process is simple, and the structure is stable.

The embodiment of the application provides a nail head part, which is used for a surgical anastomat and comprises the following components:

the clamping device comprises a first clamping jaw and a second clamping jaw which are oppositely arranged, wherein a jaw is formed between the first clamping jaw and the second clamping jaw, and at least one fixing pin is arranged at the proximal end of the second clamping jaw;

The elastic sheet comprises a bending part, a connecting part and a supporting part, wherein the bending part is provided with a positioning hole, the fixing pin is arranged in the positioning hole in a penetrating manner, the supporting part is positioned on one side of the bending part facing the first clamp, and the connecting part is connected between the bending part and the supporting part;

When the first clamping jaw is not subjected to external force, the supporting part of the elastic sheet is propped against the first clamping jaw, the elastic sheet is configured to apply a biasing force to the first clamping jaw to enable the first clamping jaw to be far away from the second clamping jaw, so that the clamping jaw is opened, and when the first clamping jaw is subjected to external force, the first clamping jaw presses the elastic sheet to deform, and the clamping jaw is closed.

In some embodiments, the bending portion includes a first bending arm and a second bending arm, one end of the first bending arm is connected with one end of the second bending arm and forms an included angle, an opening of the included angle faces a distal direction, the first bending arm is located at a side of the second bending arm facing the first jaw, and a distal end of the first bending arm is connected to the connecting portion.

In some embodiments, the positioning holes include a first positioning hole provided in the first bending arm and a second positioning hole provided in the second bending arm.

In some embodiments, the distal end face of the securing pin is provided with a step protruding in a distal-side direction, and the first bending arm is located at least partially between the step and the bottom wall of the second jaw.

In some embodiments, the distal face of the fixation pin is provided with a recess recessed in a proximal direction, and the first bending arm is at least partially located inside the recess.

In some embodiments, the second bending arm conforms to an inner surface of a bottom wall of the second jaw, the second bending arm being secured to the bottom wall of the second jaw and/or the securing pin.

In some embodiments, a side surface of the support portion facing the first jaw is a sloped guide surface, and/or an end of the connection portion facing the first jaw is sloped in a distal direction relative to an end facing away from the first jaw.

In some embodiments, the securing pin includes a first end secured to the bottom wall of the second jaw and a second end having a height less than or equal to the highest point height of the support when the jaws are closed.

In some embodiments, the device further comprises a cutter comprising a first beam engaged with the first jaw and a second beam engaged with the second jaw, the cutter being positioned at a first location proximal to the second jaw, the jaws being open, the cutter moving distally to a second location, the jaws being closed;

when the jaw is closed, the height of the lowest point of the first cross beam of the cutter is equal to or higher than the height of the second end of the fixing pin.

In some embodiments, the cutter comprises two fixing pins and two elastic sheets, wherein the fixing pins are symmetrically arranged on two sides of the cutter.

The application also provides a surgical anastomat, which comprises the nail head.

The nail head and the surgical stapler provided by the application have the following advantages:

According to the application, the elastic piece is arranged between the first clamp and the second clamp of the nail head part, the elastic piece is fixed on the second clamp through the fixing pin, the supporting part of the elastic piece always supports against the first clamp, the stability of opening the clamp jaw in an initial state is maintained, the elastic piece is matched with the fixing pin through the positioning hole, the installation process is simple, the position stability of the elastic piece can be well maintained, the structure is simple, and the use is convenient.

Drawings

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

FIG. 1 is a schematic view of the structure of a first embodiment of the application with the jaws of the staple head open;

FIG. 2 is a schematic illustration of a cartridge assembly of a staple head in accordance with a first embodiment of the present application mated with an anvil;

FIG. 3 is a top view of the cartridge bay in accordance with the first embodiment of the present application mated with the spring;

FIG. 4 is a cross-sectional view taken along the direction A1-A1 in FIG. 3;

FIG. 5 is a schematic structural view of a spring plate according to a first embodiment of the present application;

FIG. 6 is a top view of the cartridge bay in cooperation with the spring as the jaws of the first embodiment of the present application are closed;

FIG. 7 is a cross-sectional view taken along the direction A2-A2 in FIG. 6;

FIG. 8 is a schematic view of the configuration of the spring plate and cartridge bay according to the second embodiment of the present application;

Fig. 9 is a schematic structural view of the cooperation between the elastic sheet and the cartridge frame according to the third embodiment of the present application.

Reference numerals:

1. Nail bin body 43 groove

11. Step of cartridge body 44

12. Nail bin frame 5 spring plate

2. Anvil 51 support

3. Cutter 52 connecting part

31. First beam 53 first bending arm

32. First positioning hole of second cross beam 531

4. Second bending arm of fixing pin 54

41. First end 541 second positioning hole

42. Second end

Detailed Description

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

The application provides a nail head and a surgical anastomat comprising the same. The anastomat comprises an anastomat body and a nail head part arranged at the distal end of the anastomat body. The nail head comprises a first clamping jaw and a second clamping jaw which are oppositely arranged, a jaw is formed between the first clamping jaw and the second clamping jaw, at least one fixing pin is arranged at the proximal end of the second clamping jaw, the elastic sheet comprises a bending part, a connecting part and a supporting part, the bending part is provided with a positioning hole, the fixing pin penetrates through the positioning hole, the supporting part is located at one side of the bending part, which faces the first clamping jaw, and is connected between the bending part and the supporting part, wherein when the first clamping jaw is not subjected to external force, the supporting part of the elastic sheet is propped against the first clamping jaw, and the elastic sheet is configured to apply a biasing force to the first clamping jaw, which enables the first clamping jaw to be far away from the second clamping jaw, so that the jaw is opened, when the first clamping jaw is subjected to external force, which enables the first clamping jaw to be relatively closed relative to the second clamping jaw, the first clamping jaw is pressed and is closed. Therefore, the elastic piece is arranged between the first clamp and the second clamp of the nail head part, the elastic piece is fixed on the second clamp through the fixing pin, the supporting part of the elastic piece always supports against the first clamp, the stability of opening the clamp jaw in an initial state is kept, the elastic piece is matched with the fixing pin through the positioning hole, the installation process is simple, the position stability of the elastic piece can be well kept, the structure is simple, and the use is convenient.

The structure of the head of the nail in the specific embodiment will be described with reference to the accompanying drawings. It is to be understood that the drawings and the following description are only exemplary and are not intended to limit the scope of the application. In the present application, the distal and proximal ends are distal ends, relative to the operator, away from the operator, i.e., near the surgical site, and proximal ends, proximal to the operator, i.e., away from the surgical site. The axial direction refers to the distal to proximal or proximal to distal direction of the stapler, the lateral direction refers to the width direction of the stapler, and the longitudinal direction is the height direction. As in the view of fig. 1, the S1 direction or the direction opposite to the S1 direction is the axial direction, the S2 direction or the direction opposite to the S2 direction is the lateral direction, and the S3 direction is the height direction in the view of fig. 4.

Fig. 1 to 7 show the structure of a nail head according to a first embodiment of the present application. In this first embodiment, the head includes oppositely disposed first and second jaws. In this embodiment, a first jaw is shown as anvil 2 and a second jaw is shown as cartridge assembly 1. In other alternative embodiments, the first jaw may also be a cartridge assembly and the second jaw may be an anvil, respectively. A jaw is formed between the anvil 2 and the cartridge assembly 1. The cartridge assembly 1 comprises a cartridge body 11 containing staples, a cartridge holder 12 containing the cartridge body 11 and a cutter 3 for cutting tissue. The cutter 3 is an I-shaped cutter with a first cross beam 31 and a second cross beam 32, and the first cross beam 31 and the second cross beam 32 are respectively matched with the nail anvil 2 and the nail bin frame 12. The cartridge housing 12 comprises two side walls and a bottom wall connected between the bottoms of the two side walls, and the proximal end of the side walls of the cartridge housing 12 is rotatably connected with the proximal end of the anvil 2. In an initial state, the cutter 3 is positioned at a first position at the proximal end of the cartridge frame 12, and a jaw between the cartridge assembly 1 and the anvil 2 is opened. When the cutter 3 is driven to move to the second position in the distal direction, the cutter 3 applies an external force to the anvil 2 to close the anvil relative to the cartridge assembly 1, the jaw between the cartridge frame 12 and the anvil 2 is gradually closed under the action of the cutter 3, the closing of the stapler is completed, so as to clamp tissues, and the cutter 3 can be continuously driven to move in the distal direction to fire the stapler in the closed state of the stapler.

As shown in fig. 2 to 4, at least one fixing pin 4 is disposed at the proximal end of the cartridge frame 12. The fixed pin 4 is sleeved with a spring piece 5. In this embodiment, two fixing pins 4 and corresponding two spring plates 5 are provided, the two fixing pins 4 being symmetrically located on both lateral sides of the cutter 3. However, the present application is not limited thereto, and in other embodiments, the number and positions of the fixing pin 4 and the elastic piece 5 may be adjusted as needed. The securing pin 4 includes a bottom first end 41 and a top second end 42, the first end 41 being secured to the bottom wall of the cartridge housing 12. The fixing pin 4 may be integrally formed with the cartridge frame 12, or the fixing pin 4 may be a single formed part and fixed to the bottom wall of the cartridge frame 12 by welding, screwing, riveting, or the like. The elastic sheet 5 comprises a bending part, a connecting part 52 and a supporting part 51, wherein the bending part is provided with a positioning hole, the fixing pin 4 is arranged in the positioning hole in a penetrating way, the supporting part 51 is positioned on one side of the bending part facing the nail anvil 2, and the connecting part 52 is connected between the bending part and the supporting part 51.

When the nail anvil 2 is not subjected to external force, the supporting part 51 of the elastic sheet 5 is propped against the nail anvil 2, and the elastic sheet 5 is configured to apply a biasing force to the nail anvil 2 to make the nail anvil 2 far away from the nail cartridge frame 12, so that the jaws are opened. When the nail anvil 2 is subjected to external force for closing the nail anvil relative to the nail bin assembly 1, the nail anvil 2 presses the supporting part 51 of the elastic sheet 5, so that the elastic sheet 5 is elastically deformed, the supporting part 51 moves downwards, and the whole height of the elastic sheet 5 is reduced without obstructing the normal closing of the jaws until the jaws are closed. Therefore, the spring plate 5 is arranged between the nail anvil 2 of the nail head and the nail bin frame 12, the spring plate 5 is fixed on the nail bin frame 12 through the fixing pin 4, the supporting part 51 of the spring plate 5 always abuts against the nail anvil 2, and the stability of opening the jaw in an initial state is maintained. The elastic sheet 5 is matched with the fixed pin 4 through the positioning hole, and when the elastic sheet 5 is installed, the elastic sheet 5 is sleeved downwards from the second end 42 of the fixed pin 4, the installation process is simple, the position stability of the elastic sheet 5 can be well maintained, the structure is simple, and the use is convenient.

As shown in fig. 4 and 5, the bending portion includes a first bending arm 53 and a second bending arm 54, one end of the first bending arm 53 is connected with one end of the second bending arm 54 to form an included angle, an opening of the included angle faces a distal direction, the first bending arm 53 is located at a side of the second bending arm 54 facing the anvil 2, and a distal end of the first bending arm 53 is connected to the connecting portion 52. The positioning holes include a first positioning hole 531 formed in the first bending arm 53 and a second positioning hole 541 formed in the second bending arm 54, and the fixing pin 4 is simultaneously inserted into the first positioning hole 531 and the second positioning hole 541. The first positioning hole 531 has a hole diameter larger than the size of the fixing pin 4, so that the first bending arm 53 can move up and down with respect to the fixing pin 4. The second bending arm 54 is attached to the inner surface of the bottom wall of the cartridge frame 12, and the second bending arm 54 is optionally fixed to the bottom wall of the cartridge frame 12 and/or the fixing pin 4. For example, the second bending arm 54 may be welded to the bottom wall of the cartridge wall, or the second positioning hole 541 of the second bending arm 54 is in interference fit with the fixing pin 4, so that the second bending arm 54 does not move up and down relative to the fixing pin 4, and further maintains the position stability of the elastic sheet 5. The whole elastic sheet 5 may be an integrally formed metal sheet or plastic sheet, but the application is not limited thereto. The fixing pin 4 is a square column pin, and the first positioning hole 531 and the second positioning hole 541 are square holes, so that a connection that is not rotatable relative to the fixing pin 4 is formed between the elastic sheet 5 and the fixing pin 4. However, the present application is not limited thereto, and in other embodiments, the fixing pin 4 may be a cylindrical pin or other shape.

As shown in fig. 4, a side surface of the support portion 51 facing the anvil 2 is an inclined guide surface, and a top end of the guide surface is inclined toward a distal end side with respect to a bottom end. The connecting portion 52 is inclined toward the distal end side with respect to the end away from the anvil 2 at the end of the anvil 2, and the guide surface of the supporting portion 51 is inclined to a greater extent than the connecting portion 52. The anvil 2 is also inclined with respect to the cartridge frame 12 during jaw closure of the staple head. The direction of inclination of the guide surface and the connecting portion 52 is similar to the direction of inclination of the anvil 2 during closing. When the nail anvil 2 and the nail bin assembly 1 are relatively closed, the nail anvil 2 can be better matched with the supporting part 51 to press the guiding surface of the supporting part 51, so that the supporting part 51 moves towards the far-end side direction relative to the bending part, the deformation of the elastic sheet 5 is smoother in the process, and the blocking of the elastic sheet 5 to the jaw closing process of the nail head is avoided.

Fig. 6 and 7 show the state when the cutter 3 is moved to the second position. The knife 3 drives the jaws closed at this point. As shown in fig. 7, during the closing of the jaws, the supporting portion 51 moves in a distal direction with respect to the position thereof when the jaws are opened, and moves downward, the bending portion is bent and deformed, and the overall height of the elastic sheet 5 is reduced. After the jaws are closed, the height of the second end 42 of the fixing pin 4 is smaller than or equal to the height of the highest point of the supporting portion 51, and the height of the lowest point of the first cross beam 31 of the cutter 3 is equal to or higher than the height of the highest point of the supporting portion 51, that is, equal to or higher than the height of the second end 42 of the fixing pin 4. Therefore, the fixing pin 4 is not contacted with the nail anvil 2 all the time, and the normal closing of the nail anvil 2 is not affected.

After the anastomat is triggered, when the cutter 3 is pulled back to the first position at the proximal end of the cartridge frame 12, the jaw can be opened again, and the opening process of the jaw is smoother under the biasing force of the elastic sheet 5. After the jaws are opened, the elastic sheet 5 is restored to the state shown in fig. 4, and the stability of the opened state of the jaws can be maintained under the biasing force of the elastic sheet 5.

Fig. 8 shows the configuration of the spring 5 of the second embodiment of the present application mated with the cartridge holder 12. The difference between the embodiment and the first embodiment is that the distal end surface of the fixing pin 4 is provided with a recess 43 recessed toward the proximal end side, and the first bending arm 53 is at least partially located inside the recess 43. Therefore, the upper wall surface of the groove 43 may define the movement stroke of the first bending arm 53. In this embodiment, the second bending arm 54 may be fixed to the fixing pin 4 or may be movable up and down with respect to the fixing pin 4. In the process of opening the jaw of the nail head, the elastic sheet 5 stretches upwards to increase in height, and under the limiting action of the groove 43 on the first bending arm 53, the elastic sheet 5 cannot break away from connection with the fixing pin 4, so that the matching structure of the elastic sheet 5 and the fixing pin 4 is more stable.

Fig. 9 shows a configuration in which the elastic piece 5 of the third embodiment of the present application is engaged with the cartridge holder 12. The difference between the embodiment and the first embodiment is that the distal end surface of the fixing pin 4 is provided with a stepped portion 44 protruding toward the distal end side, and the first bending arm 53 is at least partially located between the stepped portion 44 and the bottom wall of the cartridge holder 12. The shape of the step portion 44 shown in fig. 9 is only an example, and the present application is not limited thereto. In this embodiment, the second bending arm 54 may be fixed to the fixing pin 4 or may be movable up and down with respect to the fixing pin 4. In the process of opening the jaw of the nail head, the elastic sheet 5 stretches upwards to increase in height, and under the limiting action of the step part 44 on the first bending arm 53, the elastic sheet 5 cannot break away from connection with the fixing pin 4, so that the matching structure of the elastic sheet 5 and the fixing pin 4 is more stable.

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

Claims (11)

1. A head for a surgical stapler, the head comprising:

the clamping device comprises a first clamping jaw and a second clamping jaw which are oppositely arranged, wherein a jaw is formed between the first clamping jaw and the second clamping jaw, and at least one fixing pin is arranged at the proximal end of the second clamping jaw;

The elastic sheet comprises a bending part, a connecting part and a supporting part, wherein the bending part is provided with a positioning hole, the fixing pin is arranged in the positioning hole in a penetrating manner, the supporting part is positioned on one side of the bending part facing the first clamp, and the connecting part is connected between the bending part and the supporting part;

When the first clamping jaw is not subjected to external force, the supporting part of the elastic sheet is propped against the first clamping jaw, the elastic sheet is configured to apply a biasing force to the first clamping jaw to enable the first clamping jaw to be far away from the second clamping jaw, so that the clamping jaw is opened, and when the first clamping jaw is subjected to external force, the first clamping jaw presses the elastic sheet to deform, and the clamping jaw is closed.

2. The stapling head according to claim 1, wherein the bending portion comprises a first bending arm and a second bending arm, wherein one end of the first bending arm is connected with one end of the second bending arm and forms an included angle, an opening of the included angle faces a distal direction, the first bending arm is located at a side of the second bending arm facing the first jaw, and a distal end of the first bending arm is connected to the connecting portion.

3. The staple head of claim 2 wherein said locating holes comprise a first locating hole provided in said first bending arm and a second locating hole provided in said second bending arm.

4. A stapling head according to claim 3, wherein the distal end face of the securing pin is provided with a step protruding in a distal side direction, the first bending arm being at least partially located between the step and the bottom wall of the second jaw.

5. A stapling head according to claim 3, wherein the distal end face of the securing pin is provided with a recess recessed in the proximal direction, the first bending arm being at least partially located inside the recess.

6. The stapling head according to claim 2, wherein the second bending arm engages an inner surface of a bottom wall of the second jaw, the second bending arm being fixed to the bottom wall of the second jaw and/or to the fixing pin.

7. The stapling head according to claim 1, wherein a side surface of the supporting portion facing the first jaw is an inclined guide surface, and/or wherein an end of the connecting portion facing the first jaw is inclined in a distal direction with respect to an end facing away from the first jaw.

8. The stapling head according to claim 1, wherein the securing pin comprises a first end and a second end, the first end of the securing pin being secured to the bottom wall of the second jaw, the second end of the securing pin having a height less than or equal to a highest point height of the support portion when the jaws are closed.

9. The stapling head of claim 8, further comprising a knife comprising a first beam engaged with said first jaw and a second beam engaged with said second jaw, said knife being positioned at a first location proximal of said second jaw, said jaws being open, said knife moving distally to a second location, said jaws being closed;

when the jaw is closed, the height of the lowest point of the first cross beam of the cutter is equal to or higher than the height of the second end of the fixing pin.

10. The stapling head according to claim 9, comprising two of the fixing pins and two of the spring plates, the fixing pins being symmetrically disposed on both sides of the cutter.

11. A surgical stapler comprising a stapling head according to any one of claims 1 to 10.