A locking mechanism for the firing lever of a stapler

Abstract

This invention provides a locking mechanism for a stapler firing rod, comprising: an axial groove on the surface of the firing rod and a limiting groove connected to the axial groove; a locking ring with a locking tongue sleeved on the firing rod and cooperating with the limiting groove; and a driving part located at the tail of the laparoscopic cutting assembly for pushing the locking ring to rotate and switching the locking tongue between an axially locked position and an axially unlocked position. When the laparoscopic cutting assembly is not installed or not properly assembled, the locking tongue of the locking ring is located in the limiting groove of the firing rod, in an axially locked position, restricting the axial movement of the firing rod. When the laparoscopic cutting assembly is properly assembled, the driving part at the tail of the laparoscopic cutting assembly pushes the locking tongue of the locking ring out of the limiting groove and slides into the axial groove, so that the locking tongue of the locking ring is in an axially unlocked position, and the firing rod can move axially. This invention has a simple and effective structure. Through the setting of the locking ring, locking tongue, driving part, axial groove, and limiting groove, the firing rod can be kept in the locked position when not properly installed, preventing accidental firing.

Description

Technical Field

[0001] This utility model relates to the field of minimally invasive surgery technology, and in particular to a locking mechanism for the firing rod of a stapler. Background Technology

[0002] In the field of minimally invasive surgery, the laparoscopic cutting and anastomosis device is an important surgical instrument. It allows entry through small incisions, enabling surgeons to quickly and conveniently cut and anastomose tissues as needed. Currently, with advancements in technology, the stapler is becoming increasingly accepted by surgeons due to its labor-saving and convenient operation. The stapler consists of a laparoscopic cutting and anastomosis component at the front end and a handle. Surgeons can choose different sizes of laparoscopic cutting components and handles to perform surgical procedures. However, achieving convenient and reliable replacement is a problem we need to solve.

[0003] Currently available staplers, such as the most representative Covidien stapler, use a linkage mechanism on a rack connected to the firing lever for positioning. When the handle is installed with the assembly, it pushes the sleeve on the firing lever, causing the linkage to move and thus unlocking the firing lever to fire forward. Simultaneously, during firing, it's necessary to ensure the endoscope cutting assembly disengages from the barrel, requiring a spring-loaded locking mechanism inside the barrel. These mechanisms occupy considerable space and have high manufacturing costs. Utility Model Content

[0004] The purpose of this utility model is to overcome the problems of complex structure, large space occupation, and high production and maintenance costs of existing firing rod locking mechanisms. It provides a locking mechanism for the firing rod of a stapler. By setting a connecting axial groove and a limiting groove on the surface of the firing rod, and cooperating with a locking ring with a locking tongue and a driving part for driving the locking ring, the firing rod is kept in the locked position when it is not installed in place, thus preventing the firing rod from being fired accidentally.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a locking mechanism for a stapler firing rod, characterized in that it includes: an axial groove disposed on the surface of the firing rod and a limiting groove connected to the axial groove; a locking ring sleeved on the firing rod and cooperating with the limiting groove, having a locking tongue; and a driving part disposed at the tail of the laparoscopic cutting assembly for pushing the locking ring to rotate and switching the locking tongue between an axially locked position and an axially unlocked position; when the laparoscopic cutting assembly is not installed or not assembled in place, the locking tongue of the locking ring is located in the limiting groove of the firing rod and is in an axially locked position, restricting the axial movement of the firing rod; when the laparoscopic cutting assembly is assembled in place, the driving part at the tail of the laparoscopic cutting assembly pushes the locking tongue of the locking ring to disengage from the limiting groove and slide into the axial groove, so that the locking tongue of the locking ring is in an axially unlocked position, and the firing rod can move axially.

[0006] Furthermore, when the locking ring's latch is in the axial unlocked position, the axial groove (2) of the firing rod slides axially with the locking ring's latch, and the locking ring is restricted from rotating during the firing rod's forward firing and backward reset processes.

[0007] Furthermore, a circumferential locking mechanism is provided between the drive unit and the locking ring to achieve interlocking of the rotation direction; during the firing rod's forward firing and backward reset process, the laparoscopic cutting assembly is restricted from rotating by the circumferential locking mechanism.

[0008] Furthermore, the circumferential locking mechanism includes: a locking boss and an unlocking boss radially symmetrically arranged on the tail drive portion of the laparoscopic cutting assembly, and a locking surface and an unlocking surface correspondingly arranged on the locking ring. The side of the locking boss is in contact with the locking surface of the locking ring, and the side of the unlocking boss is in contact with the unlocking surface of the locking ring. The locking boss pushes the locking surface to cause the locking ring tongue to enter the axial locking position, and the unlocking boss pushes the unlocking surface to cause the locking ring tongue to enter the axial unlocking position.

[0009] Furthermore, the circumferential locking mechanism includes: a plurality of driving bosses disposed at the tail drive portion of the laparoscopic cutting assembly and a locking ring disposed on the locking ring and having a notch adapted to the shape of the plurality of driving bosses.

[0010] In particular, this utility model also includes a stapler, which includes the stapler firing rod locking mechanism described above.

[0011] The beneficial effects of this utility model are: 1. This utility model features a connecting axial groove and a limiting groove on the surface of the firing lever, coupled with a locking ring with a locking tongue. This allows the locking tongue of the locking ring to have both an axially locked and an axially unlocked position. A driving unit at the tail of the laparoscopic cutting assembly drives the locking tongue to switch between these two positions, linking the unlocking of the firing lever with the installation of the laparoscopic cutting assembly. This ensures the firing lever can only be unlocked after the laparoscopic cutting assembly is installed, effectively guaranteeing operational safety and preventing instrument damage or medical accidents caused by accidental firing or disassembly by the doctor. Compared to existing technologies that commonly use multiple links to limit the forward movement of the firing lever within the handle, and a spring mechanism inside the barrel to prevent the laparoscopic cutting assembly from detaching from the barrel after firing, this utility model has a simpler and more effective structure, occupies less space, and reduces manufacturing costs.

[0012] 2. This utility model achieves interlocking between the rotational locking ring and the laparoscopic cutting assembly through a circumferential locking mechanism between the drive unit and the locking ring. During the forward firing and backward resetting movements of the firing lever, the locking ring and the laparoscopic cutting assembly are effectively restricted from rotation, preventing the laparoscopic cutting assembly from rotating out of the barrel and ensuring safety during the surgical procedure. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments will be briefly described below.

[0014] Figure 1 This is a schematic diagram of the overall structure of the anastomosis device of this utility model.

[0015] Figure 2 This is a schematic diagram of the overall structure of the axial locking position of this utility model.

[0016] Figure 3 This is an enlarged schematic diagram of the axial locking position A of this utility model.

[0017] Figure 4 This is a schematic diagram of the overall structure of the axial unlocking position of this utility model.

[0018] Figure 5 This is an enlarged schematic diagram of the axial unlocking position B of this utility model.

[0019] Figure 6 This is a schematic diagram of the tail structure of the endoscopic cutting assembly of this utility model.

[0020] Figure 7 This is a schematic diagram of the locking ring structure of this utility model.

[0021] Figure 8 This is a schematic diagram of the firing lever structure of this utility model.

[0022] Figure 9 This is a schematic diagram of the tail structure of the endoscopic cutting assembly according to another embodiment of the present invention.

[0023] Figure 10 This is a schematic diagram of the locking ring structure of another embodiment of the present invention.

[0024] Explanation of reference numerals in the attached figures: 1. Firing lever; 2. Axial groove; 3. Limiting groove; 4. Locking ring; 5. Locking tongue; 6. Endoscope cutting assembly; 7. Drive unit; 8. Locking boss; 9. Unlocking boss; 10. Locking surface; 11. Unlocking surface; 12. Drive boss; 13. Locking ring; 14. Assembly mounting base; 15. Barrel; 16. Handle. Detailed Implementation

[0025] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0026] This utility model relates to a stapler firing rod locking mechanism and a stapler, see reference. Figures 1 to 8 .

[0027] like Figures 1 to 5 As shown, the stapler includes: a handle 16, a firing rod 1, a component fixing seat 14, a barrel 15, and a laparoscopic cutting component 6. The firing rod 1 is located at the output end of the handle 16, the component fixing seat 14 is sleeved on the firing rod 1, the barrel 15 is sleeved on the component fixing seat 14, and the tail end of the laparoscopic cutting component 6 is inserted into and rotatably installed at the interface of the barrel 15. Compared with the prior art, the improvement of this embodiment of the stapler lies in the fact that by setting a communicating axial groove and a limiting groove on the surface of the firing rod, and cooperating with a locking ring with a locking tongue and a driving part for driving the locking ring, the firing rod is kept in the locked position when not fully installed, preventing the firing rod from being accidentally fired. That is, the stapler firing rod locking mechanism in the following embodiment is adopted.

[0028] like Figures 1 to 8 As shown, the locking mechanism of the anastomosis device firing rod in this embodiment includes: an axial groove 2 disposed on the surface of the firing rod 1, a limiting groove 3 connected to the axial groove 2, a locking ring 4 having a locking tongue 5 that cooperates with the limiting groove 3, and a driving part 7 disposed at the tail of the laparoscopic cutting assembly 6. The limiting groove 3 is located on one side of the top of the axial groove 2, so that the locking ring 4 and locking tongue 5 can only rotate into the axial locking position after the firing rod 1 has been fully retracted to the initial position. The locking ring 4 is sleeved on the firing rod 1, and the locking tongue 5 of the locking ring 4 slides in cooperation with the axial groove 2 and the limiting groove 3. The driving part 7 is used to push the locking ring 4 to rotate, so that the locking tongue 5 switches between the axial locking position and the axial unlocking position. The locking tongue 5 slides into the limiting groove 3 to be in the axial locking position, and the locking tongue 5 slides into the axial groove 2 to be in the axial unlocking position. The locking ring 4 is rotatably installed in the assembly fixing seat 14, and the two axial ends of the locking ring 4 are supported inside the assembly fixing seat 14 to restrict the axial movement of the locking ring 4. In another embodiment, an elastic element is also provided between the locking ring 4 and the component fixing seat 14, so that when the locking ring 4 is not driven by the driving part 7, the locking tongue 5 of the locking ring 4 is kept in the limiting groove 3, that is, the locking tongue 5 is in the initial position and the firing rod 1 cannot move axially. This is beneficial to prevent the locking tongue 5 from leaving the limiting groove 3 and causing accidental firing when the laparoscopic cutting component 6 is not installed.

[0029] When the locking tongue 5 of the locking ring 4 is in the axial unlocked position, the locking tongue 5 is located in the axial groove 2, and the axial groove 2 and the locking tongue 5 of the locking ring 4 slide in the axial direction. During the forward firing and backward reset movements of the firing rod 1, the locking ring 4 is restricted from rotating. Since a circumferential locking mechanism is also provided between the drive unit 7 and the locking ring 4, the circumferential locking mechanism is used to interlock the rotation direction of the drive unit 7 and the locking ring 4. During the forward firing and backward reset movements of the firing rod 1, the laparoscopic cutting assembly 6 is restricted from rotating by the circumferential locking mechanism.

[0030] like Figures 6 to 8As shown, the circumferential locking mechanism includes: a locking boss 8 and an unlocking boss 9 disposed on the tail drive part 7 of the laparoscopic cutting assembly 6, and a locking surface 10 and an unlocking surface 11 correspondingly disposed on the locking ring 4. The locking boss 8 and the unlocking boss 9 are radially symmetrically arranged. The side of the locking boss 8 is in contact with the locking surface 10 of the locking ring 4, and the side of the unlocking boss 9 is in contact with the unlocking surface 11 of the locking ring 4. The side of the locking boss 8, the side of the unlocking boss 9, the locking surface 10, and the unlocking surface 11 are on the same plane. The locking boss 8 is used to push the locking surface 10 to make the locking tongue 5 of the locking ring 4 enter the axial locking position, and the unlocking boss 9 is used to push the unlocking surface 11 to make the locking tongue 5 of the locking ring 4 enter the axial unlocking position. The forces on the locking surface 10 and the unlocking surface 11 are in opposite directions. In another embodiment, as shown... Figure 9 , Figure 10 The circumferential locking mechanism shown includes: a plurality of driving bosses 12 disposed on the tail drive part 7 of the laparoscopic cutting assembly 6 and a locking ring 13 disposed on the locking ring 4 and having notches adapted to the shape of the plurality of driving bosses 12. The plurality of driving bosses 12 and the notches of the locking ring 13 are adapted to each other, so that the tail drive part 7 of the laparoscopic cutting assembly 6 is circumferentially locked to the locking ring 4, effectively ensuring that the rotation of the laparoscopic cutting assembly 6 is restricted during the forward firing and backward reset of the firing rod 1.

[0031] When the laparoscopic cutting assembly 6 is not installed, the locking tongue 5 of the locking ring 4 is in the initial position (in embodiments with elastic elements, the elastic element provides force to keep the locking tongue 5 in the initial position), which is the axial locking position. The locking tongue 5 is completely within the limiting groove 3, and the firing rod 1 cannot move axially. When the laparoscopic cutting assembly 6 is being installed but not yet fully assembled, the drive unit 7 pushes the locking ring 4 to rotate, causing the locking tongue 5 to slide from the limiting groove 3 to the axial groove 2. However, at this time, the locking tongue 5 of the locking ring 4 is still completely or partially within the limiting groove 3 of the firing rod 1, in the axial locking position, and the firing rod 1 still cannot move axially. When the laparoscopic cutting assembly 6 is fully assembled, the drive unit 7 at the tail of the laparoscopic cutting assembly 6 pushes the locking tongue 5 of the locking ring 4 to completely disengage from the limiting groove 3 and slide into the axial groove 2, so that the locking tongue 5 of the locking ring 4 is in the axial unlocking position, and the firing rod 1 can move axially. This effectively ensures the safety of the installation process and avoids instrument damage or medical accidents caused by doctors accidentally firing or disassembling the assembly. The rotation angle of the laparoscopic cutting assembly 6 during installation is the same as the rotation angle at which the drive unit 7 of the laparoscopic cutting assembly 6 pushes the locking ring 4 and locking tongue 5 from the axial locking position to the axial unlocking position, which is approximately 45°. When the firing lever 1 fires forward and resets backward, the locking tongue 5 is located in the axial groove 2, and the locking ring 4 and the laparoscopic cutting assembly 6 are restricted from rotation, preventing the laparoscopic cutting assembly from rotating out of the barrel and ensuring safety during the operation.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An anastomosis device firing rod lock mechanism characterized by include: An axial groove (2) and a limiting groove (3) connected to the axial groove (2) are provided on the surface of the firing rod (1), a locking ring (4) with a locking tongue (5) is sleeved on the firing rod (1) and cooperates with the limiting groove (3), and a drive part (7) provided at the tail of the laparoscopic cutting assembly (6) for pushing the locking ring (4) to rotate so that the locking tongue (5) can switch between the axial locking position and the axial unlocking position. When the laparoscopic cutting assembly (6) is not installed or not assembled in place, the locking tongue (5) of the locking ring (4) is located in the limiting groove (3) of the firing rod (1) and is in the axial locking position, which restricts the axial movement of the firing rod (1); when the laparoscopic cutting assembly (6) is assembled in place, the driving part (7) at the tail of the laparoscopic cutting assembly (6) pushes the locking tongue (5) of the locking ring (4) to disengage from the limiting groove (3) and slide into the axial groove (2), so that the locking tongue (5) of the locking ring (4) is in the axial unlocking position, and the firing rod (1) can move axially.

2. The stapler firing bar lockout mechanism of claim 1, wherein: When the locking tongue (5) of the locking ring (4) is in the axial unlocked position, the axial groove (2) of the firing rod (1) slides axially with the locking tongue (5) of the locking ring (4). During the firing of the firing rod (1) forward and the resetting of the locking ring (4), the locking ring (4) is restricted from rotating.

3. The anastomat firing rod lockout mechanism of claim 1, wherein: A circumferential locking mechanism is provided between the drive unit (7) and the locking ring (4) to achieve interlocking of the rotation direction; during the firing rod (1) firing forward and resetting backward, the endoscopic cutting assembly (6) is restricted from rotating by the circumferential locking mechanism.

4. The stapler firing bar lockout mechanism of claim 3, wherein: The circumferential locking mechanism includes: a locking boss (8) and an unlocking boss (9) radially symmetrically arranged on the tail drive part (7) of the endoscopic cutting assembly (6), and a locking surface (10) and an unlocking surface (11) correspondingly arranged on the locking ring (4). The side of the locking boss (8) is in contact with the locking surface (10) of the locking ring (4), and the side of the unlocking boss (9) is in contact with the unlocking surface (11) of the locking ring (4). The locking boss (8) is used to push the locking surface (10) to make the locking tongue (5) of the locking ring (4) enter the axial locking position, and the unlocking boss (9) is used to push the unlocking surface (11) to make the locking tongue (5) of the locking ring (4) enter the axial unlocking position.

5. The stapler firing bar lockout mechanism of claim 3, wherein: The circumferential locking mechanism includes: a plurality of driving bosses (12) disposed on the tail drive part (7) of the endoscopic cutting assembly (6) and a locking ring (13) disposed on the locking ring (4) and having a notch adapted to the shape of the plurality of driving bosses (12).

6. The anastomat firing rod lockout mechanism of claim 1, wherein: The rotation angle of the laparoscopic cutting assembly (6) during installation is the same as the rotation angle at which the drive unit (7) of the laparoscopic cutting assembly (6) pushes the locking ring (4) and the locking tongue (5) from the axial locking position to the axial unlocking position.

7. The anastomat firing rod lockout mechanism of claim 1, wherein: The limiting groove (3) is located on one side of the top of the axial groove (2), so that the locking ring (4) and the locking tongue (5) can only rotate into the axial locking position after the firing rod (1) has been fully retracted to the initial position.

8. The anastomat firing rod lockout mechanism of claim 1, wherein: The firing rod (1) is fitted with a component fixing seat (14) at the limiting groove (3). The component fixing seat (14) is fitted with a gun barrel (15). The locking ring (4) is rotatably installed in the component fixing seat (14). The locking ring (4) is supported at both ends of the axial direction by the component fixing seat (14) to restrict the axial movement of the locking ring (4). The end of the laparoscopic cutting component (6) is inserted into and rotatedly installed at the interface of the gun barrel (15).

9. The anastomosis device firing lever locking mechanism as described in claim 8, characterized in that: An elastic element is provided between the locking ring (4) and the component fixing seat (14) so ​​that the locking tongue (5) of the locking ring (4) is kept in the limiting groove (3) when the locking ring (4) is not driven by the driving part (7).

10. A stapler, characterized in that: Includes the stapler firing lever locking mechanism as described in any one of claims 1-9.

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