Medullary cavity file

Abstract

The medullary cavity file comprises a body and a plurality of cutting edges sequentially arranged in the axial direction of the body, the multiple cutting edges are arranged around the body in the circumferential direction of the body, each cutting edge is provided with a front tool face and a rear tool face, the cutting edge is further provided with a connecting end face, the connecting end faces are connected with the front tool faces and the rear tool faces, and the connecting end faces are arranged in the extending direction of the body; one end of the body is provided with a first end face and a second end face, an included angle is formed between the first end face and the second end face, a positioning groove is formed in the first end face, and a directional groove is formed in the second end face. The cutting edge of the medullary cavity file is provided with the connecting end face, the strength and abrasion resistance of the cutting edge are remarkably enhanced through the connecting end face, and the service life of the medullary cavity file can be effectively prolonged. According to the medullary cavity file, the positioning groove and the directional groove are formed in the medullary cavity file body, so that the connection between the medullary cavity file and the medullary cavity beating and pulling device is more stable and reliable, and the situation of loosening or falling can be effectively prevented even if the medullary cavity file bears large pressure and torque in the operation process.

Description

Technical Field

[0001] This application relates to the technical field of medical devices, and in particular to a medullary canal file. Background Technology

[0002] In orthopedic surgery, the medullary reamer is a crucial medical instrument widely used to expand and prepare the medullary cavity, providing suitable space for implants such as intramedullary nails. However, despite its undeniable importance, existing medullary reamers on the market generally suffer from a series of problems that urgently need to be addressed.

[0003] The primary problem lies in the relatively short lifespan and rapid wear of intramedullary files. This is mainly due to the simple design of the cutting edge of intramedullary files, where the cutting edge is formed by the direct connection of two end faces. While this results in high sharpness, it also severely compromises wear resistance. Therefore, on average, an intramedullary file becomes unusable due to significant wear after no more than 100 surgeries. This not only greatly increases the cost of using medical devices but can also lead to interruptions in surgical procedures due to frequent file replacements, severely impacting the efficiency and stability of the surgery.

[0004] To address this issue, the industry has been exploring ways to extend the service life of medullary files and improve their stability. Traditional improvement methods mostly focus on material optimization and cutting edge design, but these methods often have limited effectiveness and fail to fundamentally solve the problem of excessive wear.

[0005] Furthermore, the poor stability of the connection between the medullary file and the medullary extraction device is another issue that cannot be ignored. During the procedure, the medullary file needs to withstand significant pressure and torque. If its connection with the medullary extraction device is not secure enough, it may loosen or detach. This not only jeopardizes the safety and success rate of the surgery but may also cause unnecessary harm to both the doctor and the patient. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the purpose of this application is to provide a medullary canal file that can significantly improve wear resistance and service life, and ensure a stable connection with the medullary canal extraction device.

[0007] The above-mentioned objective of this application is achieved through the following technical solution:

[0008] A medullary file includes a body and a plurality of cutting edges arranged sequentially along the axial direction of the body. The plurality of cutting edges are arranged circumferentially around the body. Each cutting edge has a rake face and a flank face. Each cutting edge also has a connecting end face that connects the rake face and the flank face. The connecting end face is arranged along the extension direction of the body.

[0009] Furthermore, one end of the body has a first end face and a second end face, with an included angle between the first end face and the second end face. A positioning groove is formed on the first end face, and an orientation groove is formed on the second end face.

[0010] This application further specifies that the bottom of the positioning groove is provided with a threaded positioning hole.

[0011] This application further specifies that the positioning groove has a waist-shaped structure.

[0012] This application is further configured such that the positioning groove is perpendicular to the first end face and the orientation groove is perpendicular to the second end face.

[0013] This application is further configured such that the rake faces of the plurality of cutting edges are parallel, and there is a circumferential clearance angle between the rake face of one cutting edge and the clearance face of the adjacent other cutting edge.

[0014] This application further specifies that the back angle of the peripheral blade is 45°.

[0015] This application further specifies that the thickness of the connecting end face is the peripheral blade thickness, and the peripheral blade thickness is 0.3mm.

[0016] This application further provides that an annular chip-receiving groove is formed between the two cutting edges, and the bottom of the chip-receiving groove is arc-shaped to form a bottom arc.

[0017] This application further specifies that the dimension of the bottom arc of the groove is 0.8 mm.

[0018] This application further specifies that a color ring groove is provided on one side of the body, and the surface of the medullary canal file has a titanium nitride coating.

[0019] In summary, the beneficial technical effects of this application are as follows:

[0020] 1. The cutting edge of the medullary file of this application is provided with a connecting end face. The connecting end face significantly enhances the strength and wear resistance of the cutting edge. Compared with the traditional cutting edge formed by directly connecting two end faces, the cutting edge with the connecting end face is more robust and durable, which can effectively extend the service life of the medullary file, reduce the replacement frequency due to wear, thereby reducing the cost of using medical devices and improving the efficiency and stability of surgery.

[0021] 2. The medullary canal file body of this application has a positioning groove and a directional groove, which makes the connection between the medullary canal file and the medullary canal extractor more stable and reliable. Even when subjected to greater pressure and torque during the operation, it can effectively prevent loosening or falling off. The combined use of the positioning groove and the directional groove not only improves the stability of the connection, but also ensures the precise positioning of the medullary canal file during the operation, further improving the safety and success rate of the operation. Attached Figure Description

[0022] Figure 1 This is a front view schematic diagram of a medullary canal file.

[0023] Figure 2 This is a partially enlarged schematic diagram of the cutting edge of a medullary canal file.

[0024] Figure 3 This is a right-side view of the medullary canal file.

[0025] Figure 4 This is a top view of the medullary canal file.

[0026] Figure 5 This is a cross-sectional schematic diagram of a medullary canal file.

[0027] Explanation of reference numerals in the attached figures: 1. Body; 11. First end face; 111. Positioning groove; 112. Threaded positioning hole; 12. Second end face; 121. Orientation groove; 2. Cutting edge; 21. Rake face; 22. Back face; 23. Connecting end face; 24. Peripheral clearance angle; 25. Peripheral thickness; 26. Chip groove; 3. Color ring groove. Detailed Implementation

[0028] The present application will be further described in detail below with reference to the accompanying drawings.

[0029] like Figures 1-5 As shown, a medullary file includes a body 1 and a plurality of cutting edges 2 arranged sequentially along the axial direction of the body 1. The plurality of cutting edges 2 are arranged around the body 1 in the circumferential direction. Each cutting edge 2 has a rake face 21 and a flank face 22. The cutting edge 2 also has a connecting end face 23, which connects the rake face 21 and the flank face 22. The connecting end face 23 is arranged along the extension direction of the body 1. One end of the body 1 has a first end face 11 and a second end face 12. There is an included angle between the first end face 11 and the second end face 12. A positioning groove 111 is provided on the first end face 11, and an orientation groove 121 is provided on the second end face 12.

[0030] like Figure 1 As shown, the dimensions of the body 1 gradually decrease from one end to the other. It is worth noting that the direction from one end of the body 1 to the other is the axial direction of the body 1. Figure 1 The general direction is upward and downward. This ensures that the medullary cavity can be expanded evenly and effectively during the operation.

[0031] Each cutting edge 2 has a rake face 21 and a flank face 22, as well as a connecting end face 23 connecting the rake face 21 and the flank face 22. The connecting end face 23 is arranged along the extension direction of the body 1. This design makes the cutting edge 2 more stable under stress and less prone to deformation or breakage.

[0032] On one end of the main body 1, there is a first end face 11 and a second end face 12. The first end face 11 and the second end face 12 have a certain included angle. A positioning groove 111 is formed on the first end face 11, and a directional groove 121 is formed on the second end face 12. This design provides two connecting surfaces when the medullary canal file and the medullary canal extractor are connected, cleverly achieving a dual fixation function with the medullary canal extractor. Specifically, the positioning groove 111 on the first end face 11 is used for a tight fit with the medullary canal extractor, ensuring that the medullary canal file will not shift or rotate during the operation, achieving precise positioning. The directional groove 121 on the second end face 12 also matches the medullary canal extractor, further guiding the insertion direction of the medullary canal file, improving the accuracy and safety of the operation.

[0033] During the manufacturing process, we selected high-strength, high-wear-resistant metal materials, such as stainless steel or titanium alloy, to forge the body 1 and the cutting edge 2. Preferably, the surface of the medullary file has a titanium nitride coating to increase surface hardness, ensuring not only the durability of the medullary file but also enabling it to withstand various challenges during surgery. Meanwhile, the rake face 21 and flank face 22 of the cutting edge 2 have undergone precision grinding to ensure its sharpness and cutting efficiency.

[0034] By designing the front cutting face 21, the rear cutting face 22, and the connecting end face 23 that connects them, the cutting edge 2 can be subjected to more even force during surgery, reducing wear. At the same time, the application of a high-strength, high-wear-resistant titanium nitride coating to the body 1 and the cutting edge 2 further improves the wear resistance and service life of the medullary file, reducing the cost of using medical devices.

[0035] Specifically, the positioning groove 111 is perpendicular to the first end face 11, and the orientation groove 121 is perpendicular to the second end face 12. Since there is an included angle between the first end face 11 and the second end face 12, see... Figure 5 As shown, there is also an included angle between the positioning groove 111 and the orientation groove 121. Therefore, the medullary file and the medullary extraction device are positioned and oriented through two different angles. This design enhances the stability and reliability of the connection. Because the connection between the medullary file and the medullary extraction device is more stable and reliable, the surgeon can operate with greater confidence during the operation, reducing surgical interruptions and delays caused by connection problems.

[0036] Furthermore, the bottom of the positioning groove 111 is provided with a threaded positioning hole 112.

[0037] Furthermore, the positioning groove 111 has an waist-shaped structure.

[0038] Specifically, the threaded positioning hole 112 is used to mate with the corresponding threaded portion on the medullary canal extractor, thereby further enhancing the connection stability between the medullary canal file and the medullary canal extractor. The tight fit of the threads ensures that the medullary canal file will not loosen or fall off due to external forces during the procedure, further improving surgical safety.

[0039] Specifically, the medullary canal extraction device has a limiting part that cooperates with the positioning groove 111 and the orientation groove 121. When connecting, the limiting part is engaged with the positioning groove 111 and the orientation groove 121, and then a bolt is used to pass through the limiting part and connect it with the threaded positioning hole 112. M6 bolts are preferred.

[0040] More specifically, the positioning groove 111 is designed with an waist-shaped structure. Compared with the traditional circular or square positioning groove 111, the waist-shaped positioning groove 111 has a larger contact area and better guidance. This design not only improves the connection strength between the medullary canal file and the medullary canal extraction device, but also makes the medullary canal file easier to insert into the medullary cavity, reducing resistance and improving the efficiency and success rate of the operation.

[0041] By creating a threaded positioning hole 112 at the bottom of the positioning groove 111, and having it engage with the corresponding threaded portion on the medullary canal extractor, the connection stability between the medullary canal file and the medullary canal extractor can be further enhanced. This design makes the medullary canal file more stable and reliable during surgery, reducing the surgical risks caused by loose connections.

[0042] Further, see Figure 1 and Figure 3 The rake faces 21 of the multiple cutting edges 2 are all parallel, and there is a circumferential clearance angle 24 between the rake face 21 of one cutting edge 2 and the clearance face 22 of the adjacent cutting edge 2. Specifically, the circumferential clearance angle 24 is 45°. Furthermore, the thickness of the connecting end face 23 is the circumferential clearance thickness 25, which is 0.3 mm.

[0043] like Figure 2 As shown, the peripheral blade clearance angle 24 is set to 45°, ensuring optimal cutting performance and durability of the cutting edge 2 during tissue removal. Furthermore, the thickness of the connecting end face 23 is precisely set to the peripheral blade thickness 25, i.e., 0.3 mm. This ensures that the cutting edge 2 has sufficient strength and rigidity during surgery while maintaining a small size and weight.

[0044] By setting the rake faces 21 of multiple cutting edges 2 to be parallel, and the circumferential clearance angle 24 between the rake face 21 of one cutting edge 2 and the clearance face 22 of the adjacent cutting edge 2 to be 45°, the cutting edges 2 can be ensured to have optimal cutting effect and durability when removing tissue within the medullary cavity. This design not only improves surgical efficiency but also extends the service life of the medullary cavity file.

[0045] The thickness of the connecting end face 23 is precisely set to a peripheral blade thickness 25 of 0.3 mm. This thickness ensures that the cutting edge 2 has sufficient strength and rigidity during the operation, so as to withstand greater pressure and torque and reduce the surgical risks caused by deformation or breakage of the cutting edge 2.

[0046] An annular chip groove 26 is formed between the two cutting edges 2. The bottom of the chip groove 26 is arc-shaped to form a bottom arc, and the size of the bottom arc is 0.8mm.

[0047] Since the cutting edge 2 is annular, the chip-collecting groove 26 formed between the two cutting edges 2 is also annularly arranged around the body 1. The main function of the chip-collecting groove 26 is to collect and contain bone chips and debris generated during the cutting process, so as to prevent them from accumulating near the cutting edge 2 and affecting the cutting effect and surgical progress. The design of the chip-collecting groove 26 not only improves the efficiency of the operation, but also reduces the risk of wear and breakage of the cutting edge 2 due to bone chip accumulation.

[0048] More importantly, the bottom of the chip groove 26 is designed to be arc-shaped, forming a circular arc at the bottom. The size of this arc is 0.8mm. The arc-shaped bottom ensures that bone chips and debris can slide and be discharged smoothly during the cutting process, avoiding the problems of bone chip accumulation and jamming caused by uneven bottom. In addition, setting its peripheral cutting edge back angle 24 to 45° and the size of the arc at the bottom of the groove 0.8mm can obtain a larger chip groove 26, increasing the corresponding capacity of the chip groove 26 and improving the chip holding effect.

[0049] like Figure 1 As shown, further, a color ring groove 3 is provided on one side of the main body 1. Specifically, color ring grooves 3 are provided on both sides of the main body 1. The color ring grooves 3 are different in color from other parts of the main body 1. Their function is to serve as a visual marker to remind the surgeon of the insertion depth of the medullary canal file during surgery, thereby avoiding surgical risks caused by over-insertion. The design of the color ring grooves 3 is not only eye-catching and easy to see, but also provides the surgeon with an intuitive reference during surgery.

[0050] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A canal file, characterized in that, The device includes a body (1) and a plurality of cutting edges (2) arranged sequentially along the axial direction of the body (1). The plurality of cutting edges (2) are arranged around the body (1) in the circumferential direction. Each cutting edge (2) has a rake face (21) and a flank face (22). The cutting edge (2) also has a connecting end face (23) that connects the rake face (21) and the flank face (22). The connecting end face (23) is arranged along the extension direction of the body (1). The body (1) has a first end face (11) and a second end face (12) on one end. There is an included angle between the first end face (11) and the second end face (12). A positioning groove (111) is provided on the first end face (11), and an orientation groove (121) is provided on the second end face (12).

2. The medullary canal file according to claim 1, characterized in that, The bottom of the positioning groove (111) is provided with a threaded positioning hole (112).

3. The medullary canal file according to claim 1, characterized in that, The positioning groove (111) has a waist-shaped structure.

4. The medullary canal file according to claim 1, characterized in that, The positioning groove (111) is perpendicular to the first end face (11), and the orientation groove (121) is perpendicular to the second end face (12).

5. The medullary canal file according to claim 1, characterized in that, The rake faces (21) of the plurality of cutting edges (2) are parallel, and there is a circumferential clearance angle (24) between the rake face (21) of one cutting edge (2) and the clearance face (22) of the adjacent cutting edge (2).

6. The medullary canal file according to claim 5, characterized in that, The back angle (24) of the peripheral blade is 45°.

7. The medullary canal file according to claim 1, characterized in that, The thickness of the connecting end face (23) is the peripheral blade thickness (25), which is 0.3 mm.

8. The medullary canal file according to claim 1, characterized in that, An annular chip groove (26) is formed between the two cutting edges (2), and the bottom of the chip groove (26) is arc-shaped to form a bottom arc.

9. The medullary canal file according to claim 8, characterized in that, The dimension of the arc at the bottom of the groove is 0.8 mm.

10. The medullary canal file according to claim 1, characterized in that, The body (1) has a color ring groove (3) on one side surface, and the surface of the medullary file has a titanium nitride coating.

Images