Automatic reset rack structure applied to electric medical instrument

Abstract

The utility model discloses an automatic reset rack structure applied to an electric medical instrument, which comprises a rack, a movable tooth is arranged at the firing tail end of the rack, and the movable tooth is connected to the firing tail end of the rack in a manner of sliding along the axial direction of the rack through a connecting piece. The rack is rebounded to be meshed with the output gear of the motor through the elastic force of the spring in the connecting piece, it is ensured that the rack can be reset when the output gear of the motor rotates reversely, the overall structure is simple, and the function can be achieved only by slightly transforming an existing rack.

Description

Technical Field

[0001] The utility model relates to the field of medical devices, in particular to a rack structure that can automatically reset in an electric medical device. Background Art

[0002] A stapler is a device used in medicine to replace manual suturing. Its main working principle is to use titanium staples to cut or anastomose tissues, similar to a stapler. Compared with traditional manual suturing, the advantages of using a stapler are: 1. Simple and convenient operation, saving surgical time; 2. Using titanium staples or stainless steel staples (skin staplers) for suturing is tight and moderate in tension; 3. The wound surface is smaller, so the side effects on patients are smaller, and it is more conducive to avoiding the occurrence of complications.

[0003] In the existing designs on the market, the existing stapler fires the rack through a motor, and the rack drives the cartridge to cut or anastomose tissues. In this operation process, there is often a situation where after the motor fires the rack, the rack is in an overfiring state due to inertia and other factors, that is, the rack disengages from the output gear of the motor, and it is impossible to drive the output gear to reverse by the motor to complete the reset of the rack. In response to this phenomenon, this application proposes a solution. Summary of the Invention

[0004] Purpose of the utility model: The purpose of the utility model is to provide a rack structure that can automatically reset in an electric medical device, which can automatically reset the rack and the output gear of the motor to the meshing state when the rack is in an overfiring state, and reuse the motor to reset the rack to the initial state.

[0005] Technical solution: A rack structure that can automatically reset in an electric medical device described in the utility model includes a rack. An active tooth is arranged at the firing end of the rack, and the active tooth is connected to the firing end of the rack through a connecting piece and can slide axially along the rack.

[0006] Preferably, the connecting piece includes a bolt and a spring. A threaded hole is arranged on the end face of the firing end of the rack. The bolt is connected to the rack through the threaded hole, and the spring is arranged on the outer wall of the bolt and accommodated in the threaded hole.

[0007] Preferably, the threaded hole includes a threaded section and a cavity section. The inner wall of the threaded section is provided with threads that mesh with the bolt, and the spring is accommodated in the cavity section.

[0008] Preferably, the outer diameter of the cavity section is larger than the outer diameter of the threaded section.

[0009] Preferably, the bolt penetrates through the active tooth, and the active tooth is slidably arranged on the screw rod of the bolt, between the spring and the bolt head of the bolt.

[0010] Preferably, a space for the movable teeth to move along the axial direction of the rack is provided between the bolt head of the bolt and the end face of the firing end of the rack.

[0011] Preferably, the structure of the movable teeth is the same as that of the teeth on the rack.

[0012] Beneficial effects: Compared with the prior art, the present utility model has the following advantages:

[0013] In this application, through the design of the movable teeth, the elastic force of the spring is used to rebound the rack to a state where it meshes with the output gear of the motor, ensuring that the rack can be reset when the output gear of the motor rotates in reverse. The overall structure is simple, and this function can be achieved only by making a small modification to the existing rack, which is suitable for popularization in such products.

[0014] When the rack is in the overfiring state, the output gear of the motor meshes with the movable teeth and drives the movable teeth to displace towards the end face of the firing end of the rack. During this process, the spring is compressed. When the spring is compressed to the extreme, the other Description of the Drawings

[0015] Figure 1 It is a three-dimensional structure diagram of the present utility model installed in a stapler.

[0016] Figure 2 It is a front view cross-sectional view of the present utility model.

[0017] Figure 3 It is a three-dimensional structure diagram of the rack in the present utility model.

[0018] Figure 4 It is a three-dimensional structure diagram of the movable teeth and the connecting piece in the present utility model.

[0019] Wherein: 1, rack; 2, movable teeth; 3, connecting piece; 4, bolt; 5, spring; 6, screw hole; 7, motor; 8, output gear; 41, screw rod; 42, bolt head; 61, threaded section; 62, cavity section. Detailed Embodiment

[0020] The technical solution of the present utility model will be further described below with reference to the drawings.

[0021] Referring to the attached Figures 1 to 4 Figure, the self-resetting rack structure applicable to an electric medical device shown in the present utility model includes a rack 1. A movable tooth 2 is provided at the firing end of the rack 1. The movable tooth 2 is connected to the firing end of the rack 1 through a connecting piece 3 and can slide axially along the rack 1.

[0022] In this embodiment, the connecting member 3 includes a bolt 4 and a spring 5. A threaded hole 6 is provided on the end face of the firing end of the rack 1. The bolt 4 is connected to the rack 1 through the threaded hole 6. The spring 5 is arranged on the outer wall of the bolt 4 and is accommodated in the threaded hole 6.

[0023] In this embodiment, the threaded hole 6 includes a threaded section 61 and a cavity section 62. The inner wall of the threaded section 61 is provided with threads, which mesh with the bolt 4 to fix the bolt 4. The spring 5 is accommodated in the cavity section 62. At the same time, the outer diameter of the cavity section 62 is larger than that of the threaded section 61, enabling the spring 5 to be compressed and rebound within the cavity section 62.

[0024] In this embodiment, the bolt 4 penetrates through the movable tooth 2, and the movable tooth 2 is slidably arranged on the screw rod 41 of the bolt 4 and is located between the spring 5 and the bolt head 42 of the bolt 4.

[0025] In this embodiment, a space for the movable tooth 2 to move axially along the rack 1 is provided between the bolt head 42 of the bolt 4 and the end face of the firing end of the rack 1.

[0026] In this embodiment, the structure of the movable tooth 2 is the same as that of the teeth on the rack 1, ensuring that the output gear 8 of the motor 7 can mesh with the movable tooth 2.

[0027] When the present application is in operation, when the rack 1 is in an over-firing state, that is, the firing end of the rack 1 disengages from the output gear 8 of the motor 7. At this time, the movable tooth 2 meshes with the output gear 8 of the motor 7, and the output gear 8 of the motor 7 drives the movable tooth 2 to displace towards the end face of the firing end of the rack 1. During this process, the movable tooth 2 compresses the spring 5. When the movable tooth 2 displaces towards the end face of the firing end of the rack 1 and disengages from the output gear 8 of the motor 7, the motor 7 stops working at this time. The movable tooth 2 is not subjected to the thrust of the output gear 8 of the motor 7 and is only subjected to the elastic force of the spring 5. Under the action of the elastic force of the spring 5, it rebounds until the movable tooth 2 applies a rebounding force to the end face of the bolt head 42 in the bolt 4, thereby driving the entire rack 1 to rebound by the bolt 4 to a state of meshing with the output gear 8 of the motor 7. At this time, the motor 7 is restarted to reverse, and the output gear 8 of the motor 7 drives the rack 1 to reset, and the entire reset process is completed.

Claims

1. A rack structure capable of automatically resetting used in an electric medical device, comprising a rack, characterized in that: The firing end of the rack is provided with a movable tooth, and the movable tooth is connected to the firing end of the rack through a connecting piece so as to be slidable along the axial direction of the rack.

2. The rack structure capable of automatically resetting in an electric medical device according to claim 1, characterized in that: The connecting piece includes a bolt and a spring. A screw hole is arranged on the end surface of the firing end of the rack. The bolt is connected to the rack through the screw hole. The spring is arranged on the outer wall of the bolt and accommodated in the screw hole.

3. The rack structure capable of automatically resetting in an electric medical device according to claim 2, characterized in that: The screw hole comprises a threaded section and a cavity section. The inner wall of the threaded section is provided with threads for meshing with the bolt. The cavity section contains a spring.

4. The rack structure capable of automatically resetting in an electric medical device according to claim 3, characterized in that: The outer diameter of the cavity section is greater than the outer diameter of the threaded section.

5. The rack structure capable of automatically resetting in an electric medical device according to claim 2, characterized in that: The bolt passes through the movable tooth, and the movable tooth is slidably arranged on the screw rod of the bolt and is located between the spring and the bolt head of the bolt.

6. The rack structure capable of automatically resetting in an electric medical device according to claim 2, characterized in that: A space is provided between the bolt head of the bolt and the end surface of the firing end of the rack for the movable tooth to move axially along the rack.

7. The rack structure capable of automatically resetting in an electric medical device according to claim 1, characterized in that: The movable teeth have the same structure as the teeth on the rack.

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