Abrasive drill handle with load loss protection function

Abstract

The abrasive drill handle comprises a base plate, an upper cover, a guide rail, a sliding block, a motor support, a motor, a one-way damper, an electromagnet, a spring, a switch button assembly and the like, motor driving is achieved by triggering a switch button after a drill bit makes contact with a hard object, and the abrasive drill handle has the advantages of being simple in structure, low in cost, high in safety and rapid in response. A switch with a pure mechanical structure design is used for triggering driving, and driving is not carried out if triggering is not carried out, so that the device has the characteristic of quick response; the one-way damper slows down the advancing speed of the drill bit after stress is lost, so that the function of load loss protection is achieved; meanwhile, the electromagnet enables the drill bit to stop at a preset position, possible harm to the human body is further reduced, and the characteristic of high safety is achieved; the integrated design greatly reduces the dependence of external components, the structure is simple, and the safety problem of the abrasive drill handle in the operation at the complex tissue of the human body is solved through the capacity of load loss protection and quick response.

Description

Technical Field

[0001] The invention relates to the field of medical burr handles, in particular to a burr handle with load loss protection. Background Art

[0002] With the increasing aging of the population and the increasing incidence of sports injuries, the incidence of aging-related diseases such as osteoarthritis and spinal injuries, as well as chronic orthopedic conditions, is also increasing dramatically. Drill handles play a crucial role in orthopedic joint and spinal surgery, typically grinding bone. Some lesions are hidden behind hard tissue, requiring bone grinding before surgery. Bones often grow alongside soft tissues such as nerves and ligaments, making it a major challenge for surgeons to achieve a smoother, more precise grinding of hard tissue without damaging it.

[0003] Existing patents related to drill handles mostly focus on the rapid replacement of tools, tool design, support accessories of the drill handle, and the design of the handle's clamping and direction-changing functions. There is no patent invention for the use scenario of protecting soft tissue during hard tissue grinding. For example, patent number CN105902295A is a direction-changing drill power handle and its components. A direction drive member is provided on the handle, which is conducive to the direction-changing drive operation of the drill tool. The direction drive member for adjusting the revolution direction and the pitch drive member for adjusting the pitch motion are respectively provided on different components, which is conducive to simplifying the tool structure, making assembly and operation independent, avoiding interference between the revolution drive and other operations on the tool, and helping to improve the operability of the drill assembly and ensure the smooth completion of the operation. However, the multifunctional and complex structure also brings extremely high rigidity. Its design is not suitable for the protection of soft tissue. In the spinal surgery scenario where soft tissues are crisscrossed, it greatly increases the complexity of the operation. Summary of the Invention

[0004] In view of this, the present invention aims to provide a drill handle with a load-loss protection function. By combining a one-way damper and a spring, the handle possesses a load-loss protection function based on structural principles, achieving an optimized design of the drill handle in terms of structural simplification, improved flexibility, and rapid response. The simple structural design and common components help improve the integrity of the drill handle and reduce production costs; the improved flexibility enhances the safety of the drill handle during surgery; and the rapid response lays the foundation for the load-loss protection function during surgery, ensuring a rapid response during the sudden transition from hard tissue to soft tissue, thereby achieving the load-loss protection function of the entire drill handle.

[0005] In order to achieve the above technical objectives and effects, the present invention is implemented through the following technical solutions:

[0006] A drill handle with a load loss protection function, comprising:

[0007] The chassis has slots on the front to facilitate the removal and installation of the chassis and the upper cover. The chassis and the upper cover are fixed by snaps. An extension plate is provided inside the chassis, and the snap-on structure is designed on the plate to cooperate with the groove structure of the upper cover to fix it.

[0008] The upper cover has a groove structure inside, which can cooperate with the snap-on structure of the chassis parts to fix them. A wiring groove is left at the rear end to connect the wires of the internal wired parts to the outside through the wiring groove.

[0009] The guide rail is used in conjunction with the slider and is fixed to the chassis by fixing bolts.

[0010] The slider is used in conjunction with the guide rail and is fixed to the motor bracket by fixing bolts.

[0011] Furthermore, the first electromagnet and the second electromagnet are both fixed to the chassis by screws.

[0012] Furthermore, the motor bracket is a special-shaped part, which combines an ordinary motor bracket, a rack and a spring fixing part. The rack part cooperates with the gear assembly of the one-way damper. A spring is installed in the spring fixing part to fix the spring. There is a through hole with a diameter of 3.4 mm at its bottom for cooperating with the slider. In addition, there are installation grooves reserved around it to install the first permanent magnet and the second permanent magnet. The installation method is to form a fixed connection through 502 strong glue; the special-shaped part is made by 3D printing, and one part combines multiple functions, which saves space and reduces the size of the drill handle.

[0013] Furthermore, the one-way damper includes a one-way damper gear and a one-way damper base, which cooperate to form a one-way damper. The one-way damper base cooperates with the upper cover through fixing bolts, and the one-way damper gear engages with the rack portion of the motor bracket.

[0014] Furthermore, the switch button assembly includes a button seat, a switch button and a thin film pressure sensor. The switch button is installed and matched with the mounting groove reserved on the button seat. The thin film pressure sensor is glued to the button seat with 502 strong glue to form the switch button assembly.

[0015] Compared with the existing technology, the beneficial effects of the present invention are:

[0016] The present invention provides a drill grinding handle with a load loss protection function. The drill grinding handle is driven by only one motor, which reduces the dependence on driving components and simplifies the structure. The one-way damper and the spring are combined to provide a load loss protection function based on the structural principle. At the same time, the drill grinding handle is driven by only one motor, combined with the usage scenario, and utilizes the different forces applied to the drill bit by soft and hard tissues to realize the self-starting function of the drill grinding handle for hard tissue and the non-starting function for soft tissue, without relying on sensors. The drill grinding handle is optimized in terms of simple structure, high flexibility and rapid response. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of a drill handle with a load loss protection function according to the present invention;

[0018] Figure 2 This is an exploded view of the structure of a drill handle with a load loss protection function according to the present invention;

[0019] Figure 3 This is a second angle structural diagram of a drill handle with a load loss protection function according to the present invention;

[0020] Figure 4 Schematic diagram of the structure of the switch button assembly of the present invention;

[0021] Figure 5 This is a structural diagram of the parts of the motor bracket in the present invention;

[0022] Figure 6 Schematic diagram of the overall structure of the drill handle of the present invention (undriven state);

[0023] Figure 7 Schematic diagram of the overall structure of the drill handle of the present invention (driving state);

[0024] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0025] 1- Chassis; 2- Upper cover; 3- Motor bracket; 4- Motor; 5- One-way damper; 6- Guide rail; 7- Slider; 8- Switch button assembly; 9- First electromagnet; 10- Second electromagnet; 11- First permanent magnet; 12- Second permanent magnet; 13- Spring; 14- Coupling; 15- Drill bit; 501- One-way damper gear; 502- One-way damper base; 801- Button seat; 802- Switch button; 803- Thin film pressure sensor. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention 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 only used to explain the present invention and are not intended to limit the present invention.

[0027] like Figures 1 to 7 As shown, the present invention is a drill handle with a load loss protection function, which includes: a chassis 1, an upper cover 2, a motor bracket 3, a motor 4, a one-way damper 5, a guide rail 6, a slider 7, a switch button assembly 8, a first electromagnet 9, a second electromagnet 10, a first permanent magnet 11, a second permanent magnet 12, a spring 13, a coupling 14, and a drill bit 15. The chassis 1 and the upper cover 2 can be portable assembled and disassembled through their own buckle and groove structure. The switch button assembly 8 includes a button seat 801, a switch button 802 and a film pressure The sensor 803 and the switch button 802 are installed in cooperation with the mounting grooves reserved on the button seat 801, and the thin film pressure sensor 803 is fixed to the button seat 801 by means of strong glue 502; the one-way damper 5 includes a one-way damper gear 501 and a one-way damper base 502, and the one-way damper gear 501 and the one-way damper base 502 are bonded together; the drill bit 15 is connected to the output shaft of the motor 4 through the coupling 14; the first electromagnet 9 and the second electromagnet 10 are both installed on the chassis 1.

[0028] In this embodiment, the one-way damper gear 501 cooperates with the one-way damper base 502 to provide unidirectional damping for the drill handle, thereby realizing the load-loss protection function.

[0029] In this embodiment, the spring 13 and the thin film pressure sensor 803 fit together to transmit pressure. When the drill bit loses force or the force is reduced, the spring 13 extends and pushes the motor bracket 3 to push the off button 802 away. The thin film pressure sensor 803 detects the pressure change, and at this time triggers the first electromagnet 9 and the second electromagnet 10 to attract the first permanent magnet 11 and the second permanent magnet 12, so that the slowly moving drill bit 15 stops at a preset position, further reducing possible harm to the human body.

[0030] In this embodiment, the invention mainly has two systematic working stages: the retreat trigger switch button stage and the load loss protection stage.

[0031] During the retraction stage of triggering the switch button 802, the drill bit 15 is subjected to force, and the force is transmitted along the rigid structure to drive the motor bracket 3 to retract along the slider 7 on the guide rail 6. When the switch button 802 is pressed to a certain extent, the circuit is connected and the motor 4 rotates, and the grinding drill handle starts working. This requires that the drill bit 15 needs to be subjected to a certain degree of force to trigger the switch. In the scenario of grinding hard tissue, the motor 4 can work normally, and in the scenario of soft tissue, the motor 4 will not work. Therefore, it is a structural design that protects soft tissue. This is the retraction stage of the trigger switch button.

[0032] During the unload protection stage, the drill bit 15 loses its force and the energy accumulated in the spring 13 is released. At this time, the motor bracket 3 drives the drill bit 15 to move forward as a whole. Just as it moves forward, the switch button 802 is released, the motor 4 stops, and the rack on the motor bracket 3 is tightly attached to the one-way damper gear 501. Due to the effect of damping, the drill bit 15 moves forward at a very slow speed. At this time, the spring 13 stretches and releases energy. The thin-film pressure sensor 803 detects that the pressure becomes smaller and connects the electromagnet circuit. The first electromagnet 9 attracts the first permanent magnet 11, and the second electromagnet 10 attracts the second permanent magnet 12. The motor bracket 3 stops at the designed position and no longer moves forward.

[0033] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A drill handle with load loss protection, characterized in that: include: Chassis (1), upper cover (2), motor bracket (3), motor (4), one-way damper (5), guide rail (6), slider (7), switch button assembly (8), first electromagnet (9), second electromagnet (10), first permanent magnet (11), second permanent magnet (12), spring (13), coupling (14), drill bit (15); The chassis (1) is fixed to the guide rail (6), the switch button assembly (8), the first electromagnet (9) and the second electromagnet (10) by bolt connection; the motor bracket (3) is fixed to the motor (4) and the slider (7) by bolt connection; the one-way damper (5) is fixed to the upper cover (2) by bolt connection; and the drill bit (15) is fixed to the output shaft of the motor (4) by a coupling (14).

2. A drill handle with unload protection according to claim 1, characterized in that: The switch button assembly (8) comprises a button seat (801), a switch button (802) and a thin film pressure sensor (803); the switch button (802) is mounted in a mounting groove reserved on the button seat (801); and the thin film pressure sensor (803) is fixed to the button seat (801) by glue. The first permanent magnet (11) and the second permanent magnet (12) are fixedly bonded to the outer side of the motor bracket (3) by glue, and the spring (13) is installed in a spring installation groove at the bottom of the motor bracket (3), and the spring installation groove plays a limiting role; The one-way damper (5) comprises a one-way damper gear (501) and a one-way damper base (502); the one-way damper gear (501) and the one-way damper base (502) are bonded together to form the one-way damper (5).

3. The drill handle with unload protection according to claim 1, characterized in that: The load-loss protection method is as follows: when the working scene of the drill bit (15) changes from hard to soft, the spring (13) behind the motor bracket (3) will return to its original state from the compressed state to release energy. At this time, the spring (13) pushes the motor bracket (3) forward, and the forward direction is exactly the damping direction of the one-way damper (5). Therefore, the forward speed of the drill bit (15) is slowed down, which plays a role in load-loss protection; the first electromagnet (9), the second electromagnet (10), the first permanent magnet (11), and the second permanent magnet (12) play a role in protecting the load-loss protection function of the one-way damper (5), so that the drill bit (15) stops rotating and stops moving forward during the load-loss process, thereby better protecting the human body.

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