Medical drill bit structure and drilling device

Abstract

The utility model discloses a medical drill bit structure and a drilling device. The medical drill bit structure comprises a main bearing body, and the main bearing body is hollow; the far end of the main bearing body is a drilling end face, and a cutting edge is arranged on the drilling end face in a protruding mode. Each cutting edge comprises a first cutting face, a second cutting face and a third cutting face, every two of the first cutting face, the second cutting face and the third cutting face intersect, an included angle is formed between the first cutting face and the second cutting face, the third cutting face extends towards the far end of the main bearing body along the inner wall of the main bearing body, and the vertical distance from the far end of the cutting edge to the end face of the drill hole is 0.05-1 mm. According to the drill bit, the phenomenon that the cutting edge of the drill bit is broken in an orthopedic operation can be effectively reduced, the situation that the guide needle is cut in the operation process, so that the guide needle is broken in a body or metal chips exist, or the cutting edge is broken is reduced, and the safety of the operation is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a medical drill bit structure and a drilling device. Background Art

[0002] Surgical instruments such as hollow taps and hollow drills are widely used in surgeries in orthopedics, stomatology and other departments. When these tools are used in surgeries, it is often necessary to drill through hard cortical bone; during the surgery, the skin, subcutaneous tissue and deep fascia are incised, and then a long guide pin is inserted, and then a hollow drill or a hollow tap is introduced along the guide pin.

[0003] In the prior art, the guide pin may bend when entering the body due to force or may be bent and deformed due to the internal environment of the body. When the existing hollow drill is introduced into the human body, the drill bit is likely to grind or even cut the guide pin due to the bending of the guide pin, and there is also a risk of the bone drill chipping. Whether the guide pin breaks in the body or there are metal chips, or the bone drill chips, it is not beneficial to the surgical process, not only prolonging the surgical time, but also causing medical accidents.

[0004] Therefore, it is necessary to provide a new medical drill bit structure and a medical drilling device to solve the above problems existing in the prior art. Utility Model Content

[0005] One of the purposes of the present invention is to provide a medical drill bit structure and a drilling device for drilling bone, which can at least reduce the possibility of the drill bit cutting the guide pin.

[0006] To achieve the above purpose, the technical solution of the present invention is as follows:

[0007] In the first aspect, the present application discloses a medical drill bit structure, which is characterized in that it includes a main carrier, and the main carrier is hollow;

[0008] The distal end of the main carrier is a drilling end face, and a cutting edge is convexly provided on the drilling end face;

[0009] The cutting edge includes a first cutting surface, a second cutting surface and a third cutting surface that intersect pairwise. An included angle is formed between the first cutting surface and the second cutting surface. The third cutting surface extends along the inner wall of the main carrier towards the distal end of the main carrier, so that the vertical distance from the cutting edge protruding from the drilling end face is 0.05 - 1 mm.

[0010] By adopting the above technical solution, the height of the cutting edge above the drilling end face is 0.05 - 1 mm, which can increase the speed of drilling, and at the same time reduce the risk of wear and cutting the guide pin. During the working process, the hollow main carrier is sleeved on the guide pin and moves along the axis of the guide pin on the guide pin, and at the same time rotates around the axis of the main carrier itself; due to the low height of the cutting edge, the situation of cutting the guide pin during the operation, resulting in the fracture of the guide pin in the body or the presence of metal debris, is reduced.

[0011] Optionally, the first cutting surface is circumferentially inclined around the drilling end face and smoothly intersects with the drilling end face.

[0012] By adopting the above technical solution, the first cutting surface is inclined and smoothly intersects with the drilling end face. During the drilling process, the first cutting surface contacts the bone mass, making it easier to drill on the bone mass, improving the drilling efficiency and reducing the operation time.

[0013] Optionally, the included angle between the first cutting surface and the axis of the main carrier is 75 - 85°.

[0014] By adopting the above technical solution, when the included angle between the first cutting surface and the axis of the main carrier is between 75° and 85°, the cutting effect of the cutting edge is better, which helps to improve the drilling efficiency, thereby reducing the operation time and increasing the safety of the operation.

[0015] Optionally, the side wall of the main carrier is provided with an external thread, the external thread extends along the axial direction of the main carrier, and the outer diameter of the external thread gradually decreases in the direction close to the cutting edge.

[0016] By adopting the above technical solution, the outer diameter of the thread at the cutting edge forms a tapered angle, which is beneficial to the cutting edge to break through the bone mass, can achieve labor saving, and thus improve the drilling efficiency; at the same time, due to the design feature of the external thread with a tapered angle, better self-locking performance can be provided during the drilling process, thereby improving the stability during the drilling process; at the same time, such a setting can provide a larger contact area at the root of the external thread, so as to better distribute the force, reduce local stress concentration, and thus reduce the possibility of thread damage during the drilling process.

[0017] Optionally, the external thread has a cutting side wall, and there is a transition surface between the cutting side wall and the side wall of the main carrier.

[0018] By adopting the above technical solution, there is a transition surface between the cutting side wall and the side wall of the main carrier. The transition surface is mainly used to reduce the stress concentration at the part where the cutting side wall contacts the side wall of the main carrier, that is, to reduce the stress concentration at the root of the cutting edge, thereby reducing the possibility of the cutting edge breaking.

[0019] Optionally, the transition surface is an arc surface, and the radius of the transition surface is 0.5-1 mm.

[0020] By adopting the above technical solution, the transition surface is an arc surface. The arc setting enables the transition surface to provide a smooth transition from the high-stress area to the low-stress area, reducing the stress gradient and thus reducing the degree of stress concentration. Since the stress is more evenly distributed in the arc area, the arc surface helps to improve the overall strength and fatigue life of the structure.

[0021] Optionally, the angle between the cutting side wall and the axis of the main carrier is 50-70°.

[0022] By adopting the above technical solution, the angle between the cutting side wall and the axis of the main carrier is 50-70°. When drilling into the bone, the cutting side wall can provide a force along the movement direction of the main carrier to the main carrier, enabling the drilling process to be completed more quickly and efficiently.

[0023] Optionally, the main carrier further includes:

[0024] A self-tapping groove that divides the external thread along the axial direction of the main carrier;

[0025] The self-tapping groove includes a first self-tapping surface and a second self-tapping surface, and the angle between the first self-tapping surface and the second self-tapping surface is greater than 0° and less than 180°.

[0026] By adopting the above technical solution, the self-tapping groove divides the external thread along the axial direction of the main carrier, making the external thread a non-continuous thread structure, facilitating the drilling process. At the same time, the angle between the first self-tapping surface and the second self-tapping surface is greater than 0° and less than 180°, increasing the contact area between the side wall of the self-tapping groove and the bone during the drilling process, thus enabling the thread to be tapped more quickly.

[0027] Optionally, the number of cutting edges is multiple, and the multiple cutting edges are evenly distributed along the circumferential direction of the drilling end face.

[0028] By adopting the above technical solution, during the drilling process, multiple cutting edges act on the bone together, effectively improving the drilling efficiency.

[0029] Optionally, the side wall at the distal end of the main carrier is provided with a plurality of connecting surfaces, and the connecting surfaces are disposed between adjacent two of the cutting edges; the connecting surfaces are inclined from the drilling end face along the axial direction of the main carrier towards the direction away from the axis of the main carrier.

[0030] By adopting the above technical solution, the connecting surfaces are inclined from the drilling end face along the axial direction of the main carrier towards the direction away from the axis of the main carrier, reducing the width of the drilling end face in the radial direction of the main carrier, facilitating the drilling process.

[0031] Optionally, the included angle between the connecting surface and the axis of the main carrier is 15-30°.

[0032] By adopting the above technical solution, when the inclination angle of the connecting surface is between 15° and 30°, the drilling efficiency is better, and it is helpful to quickly discharge some bone chips generated by drilling the bone.

[0033] In a second aspect, the present application also discloses a medical drilling device, including a connecting rod and a drill bit structure. The distal end of the connecting rod is provided with the main carrier, and the proximal end of the connecting rod is provided with a driving joint. The driving joint is arranged at the proximal end of the connecting rod, and the cross section of the driving joint is circular or polygonal.

[0034] By adopting the above technical solution, the main carrier can be used in cooperation with an external quick-change handle through the driving joint to achieve quick replacement, which is convenient for the drilling process.

[0035] The drill bit structure of the medical drill bit and drilling device provided by the present invention has at least the following beneficial effects:

[0036] 1. In this solution, the special edge structure is set. Without affecting the sharpness of the drill bit during the operation, the situation of grinding or even cutting the guide pin is reduced; since the edge height is between 0.05-1 mm, it is avoided that the guide pin is worn or cut during the operation, resulting in the fracture of the guide pin in the body or metal debris, effectively improving the safety of the operation process.

[0037] 2. An arc-shaped transition surface is arranged at the outer thread near the edge at the distal end, which effectively disperses the stress concentration at the edge, improves the overall strength and fatigue life of the structure. At the same time, the arc-shaped surface can reduce the initiation and propagation of cracks, thereby prolonging the fatigue life of the structure; in this solution, the possibility of fracture and chipping at the root of the edge is effectively reduced, thus improving the safety of the operation process.

[0038] 3. The drilling end face is a plane perpendicular to the axis of the main carrier. During the drilling process, even if the guide pin is bent to a certain extent, the inner diameter edge of the drilling end face arranged as a plane will not cut the side wall of the guide pin, further reducing the possibility of generating metal debris.

[0039] 4. A driving joint is arranged at the end of the connecting rod. Through the driving joint, an external handle can be connected. At the same time, when the cross section of the driving joint is polygonal, quick replacement of the external handle can be realized, effectively reducing the time for replacing the handle, thereby reducing the operation time and increasing the safety of the operation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the main structure of an embodiment of the present invention;

[0041] Figure 2 It is a partial enlarged view of an embodiment of the present invention;

[0042] Figure 3 is Figure 1 the enlarged view of part A in

[0043] Figure 4 is Figure 2 the enlarged view of part B in

[0044] Figure 5 It is a schematic diagram of the angle between the first cutting surface, the cutting side wall and the axis of the main carrier;

[0045] Figure 6 It is a schematic diagram of the angle between the connecting surface and the axis of the main carrier;

[0046] Figure 7 It is a schematic diagram of the thread outer diameter angle at the distal end of the external thread near the cutting edge.

[0047] Reference numerals:

[0048] 100, main carrier; 110, drilling end face; 120, cutting edge; 130, first cutting surface; 140, second cutting surface; 150, third cutting surface; 160, external thread; 161, cutting side wall; 162, transition surface; 170, self-tapping groove; 171, first self-tapping surface; 172, second self-tapping surface; 180, connecting surface; 200, connecting rod; 210, driving joint. Detailed implementation manners

[0049] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meanings understood by those of ordinary skill in the art in the field to which the present invention belongs. The words such as "including" used herein mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects.

[0050] The term "distal end" in the text refers to the end far from the operator and close to the patient; the term "proximal end" refers to the end close to the operator and far from the patient.

[0051] The following further elaborates on the detailed implementation manners of the present invention with reference to the accompanying drawings.

[0052] In a first aspect, an embodiment of the present invention provides a drill bit structure for a medical drilling device, referring to Figures 1-7 , which includes: a main carrier 100. The main carrier 100 is hollow, and the distal end in the axial direction of the main carrier 100 is a drilling end face 110. The axis of the main carrier 100 is perpendicular to the drilling end face 110. A cutting edge 120 is convexly provided on the drilling end face 110 by an integral molding method. The cutting edge 120 includes a first cutting surface 130, a second cutting surface 140, and a third cutting surface 150. The first cutting surface 130, the second cutting surface 140, and the third cutting surface 150 intersect pairwise. Among them, a certain angle is formed between the first cutting surface 130 and the second cutting surface 140, and the first cutting surface 130 intersects with the drilling end face 110; the third cutting surface 150 is coplanar with the inner wall of the main carrier 100, and the third cutting surface 150 extends along the inner wall of the main carrier 100 towards the distal end of the main carrier 100, so that the height H of the cutting edge 120 protruding from the drilling end face 110 is 0.05 - 1 mm, that is, the vertical distance from the distal end of the cutting edge 120 to the drilling end face 110 is between 0.05 - 1 mm, as Figure 4 shown. The hollow part of the main carrier 100 is used to thread a guide pin. During the working process, the guide pin is positioned at a predetermined position on the bone, the main carrier 100 is sleeved on the guide pin, and it moves along the axial direction of the guide pin. During this process, the main carrier 100 rotates, so that the cutting edge 120 cuts and drills at the predetermined position, completing the drilling process. During this process, since the height of the cutting edge 120 protruding from the drilling end face 110 is 0.05 - 1 mm, during the drilling process, the cutting edge 120 on the drilling end face 110 can quickly complete the drilling process, which can increase the speed of drilling; at the same time, selecting this height can reduce the risk of the cutting edge 120 chipping when encountering hard bone; since the protruding height of the cutting edge 120 on the drilling end face 110 is between 0.05 - 1 mm, it reduces the occurrence of the cutting edge 120 cutting the side wall of the guide pin during the operation, resulting in the fracture of the guide pin in the body or the generation of metal debris.

[0053] Referring to Figures 1-7 , the cutting edge 120 has a first cutting surface 130. The first cutting surface 130 is inclined along the main carrier 100 circumferentially around the drilling end face 110. One side smoothly intersects with the drilling end face 110, and the other side intersects with the second cutting surface 140. Preferably, the angle between the first cutting surface 130 and the axis of the main carrier 100 is 75 - 85°. The drilling effect is better within this range. In this embodiment, as Figure 5 shown, specifically, the angle between the first cutting surface 130 and the axis of the main carrier 100 is selected to be 80°.

[0054] The second cutting surface 140 of the cutting edge 120 intersects the first cutting surface 130 and the drilling end face 110 simultaneously. At the same time, the first cutting surface 130, the second cutting surface 140 and the third cutting surface 150 intersect, and the cutting edge 120 is arranged in a sharp angle shape. The included angle between the second cutting surface 140 and the drilling end face 110 is preferably 90°, that is, the third cutting surface 150 is perpendicular to the drilling end face 110, which is convenient for the drilling process.

[0055] Reference Figures 1-7 , an external thread 160 is provided on the side wall of the main carrier 100, and the external thread 160 extends along the axial direction of the main carrier 100 on the side wall of the main carrier 100; during the drilling process, the external thread 160 on the main carrier 100 cooperates with the cutting edge 120 to break through the bone mass; or only relying on the cutting edge 120 can also achieve the effect of breaking through the bone mass.

[0056] In some embodiments, the outer diameter of the thread of the external thread 160 gradually decreases in the direction close to the cutting edge 120, that is, the external thread 160 at the distal end of the main carrier 100 is designed in a tapered manner, so that a tapered structure is formed at the position where the external thread 160 is close to the cutting edge 120. The external thread 160 arranged in this way is convenient for cooperating with the cutting edge 120 to break through the bone mass during the drilling process and achieve the effect of saving effort. In some embodiments, as Figure 7 shown, the tapered angle of the tapered structure formed at the position where the external thread 160 at the distal end is close to the cutting edge 120 is 15-16°.

[0057] In some embodiments, the external thread 160 located at the proximal end of the main carrier 100 also gradually decreases in the direction away from the cutting edge 120 and forms a tapered structure, which is convenient for the drilling process; that is, the connection line of the outer diameters of the external thread 160 in the middle of the main carrier 100 is parallel to the axis of the main carrier 100, and the outer diameters of the external thread 160 at both ends gradually decrease, which helps the drilling process.

[0058] The external thread 160 provided on the outer side wall of the main carrier 100 is a multi-threaded structure, and a double-threaded structure is adopted in this embodiment; the multi-threaded structure can move a longer distance during each rotation. Therefore, in the case of moving the same distance, compared with the single-threaded structure, the required number of rotation turns is less, thereby improving the drilling efficiency. At the same time, because the distance moved per revolution is longer, the multi-threaded structure can bear a greater axial force, so it has a higher load-bearing capacity, making the external thread 160 not easily damaged and enhancing the service life of the external thread 160.

[0059] In some embodiments, as Figure 3As shown, the external thread 160 has a cutting side wall 161 that intersects with the first cutting surface 130. At the same time, there is a certain angle between the cutting side wall 161 and the axis of the main carrier 100. Preferably, the angle between the cutting side wall 161 and the axis of the main carrier 100 is 50 - 70°. In a preferred embodiment, as Figure 5 shown, the angle between the cutting side wall 161 and the axis of the main carrier 100 is 60°. Such a setting increases the contact area between the main carrier 100 and the predetermined position on the bone during the drilling process, facilitating the drilling process. In addition, a transition surface 162 is provided between the cutting side wall 161 and the side wall of the main carrier 100. The transition surface 162 is used to reduce the stress concentration at the root of the cutting edge 120, thereby reducing the possibility of the root of the cutting edge 120 breaking during operation. The transition surface 162 can be a planar transition or a curved surface transition. In this embodiment, the transition surface 162 is an arc surface, and the radius of the transition surface 162 is 0.5 - 1 mm.

[0060] In some embodiments, referring to Figure 2 , the main carrier 100 further includes a self - tapping groove 170. The length direction of the self - tapping groove 170 is parallel to the axis direction of the main carrier 100. The self - tapping groove 170 penetrates the external thread 160 along the axis direction of the main carrier 100 and divides the external thread 160. The self - tapping groove 170 is mainly used for tapping threads.

[0061] In addition, the self - tapping groove 170 can also extend to the side wall of the main carrier 100 while penetrating and dividing the thread, that is, the self - tapping groove 170 divides the side wall of the main carrier 100 while dividing the external thread 160. In this embodiment, the case where the self - tapping groove 170 divides the side wall of the main carrier 100 at the same time is preferably selected. At the same time, the self - tapping groove 170 does not extend radially into the interior of the main carrier 100.

[0062] The number of self-tapping grooves 170 can be selected as one, two or multiple. In this embodiment, the number of self-tapping grooves 170 is selected as three. The self-tapping grooves 170 increase the contact surface between the external thread 160 and the bone. At the same time, the cooperation between the self-tapping grooves 170 and the multi-start thread will make the drilling speed faster and the effect of tapping the thread better, which is beneficial to the later screw screwing. The self-tapping grooves 170 can be composed of two intersecting surfaces or multiple intersecting surfaces along the axial direction of the main carrier 100. In this embodiment, the self-tapping grooves 170 include two surfaces along the axial direction of the main carrier 100, namely the first self-tapping surface 171 and the second self-tapping surface 172. The first self-tapping surface 171 intersects with the second self-tapping surface 172, and the included angle between the first self-tapping surface 171 and the second self-tapping surface 172 is greater than 0° and less than 180°. In this embodiment, the included angle between the first self-tapping surface 171 and the second self-tapping surface 172 is 90°, that is, the first self-tapping surface 171 is perpendicular to the second self-tapping surface 172. Such a setting can maximize the contact area between the side wall of the self-tapping groove 170 and the bone, facilitating the drilling and tapping processes.

[0063] When the self-tapping grooves 170 are composed of multiple surfaces, the surfaces on both sides of the self-tapping grooves 170 in contact with the outer diameter of the thread of the external thread 160 are defined as the first self-tapping surface 171 and the second self-tapping surface 172. At this time, the included angle between the first self-tapping surface 171 and the second self-tapping surface 172 can be 0° or 180°, that is, the state where the first self-tapping surface 171 and the second self-tapping surface 172 have a certain included angle is included, and the state of being parallel to each other is also included.

[0064] Reference Figures 1-7 , in some embodiments, the number of cutting edges 120 is multiple, and the multiple cutting edges 120 are evenly distributed along the circumferential direction of the drilling end face 110. In the preferred embodiment, the number of cutting edges 120 is three, that is, the number of cutting edges 120 is the same as the number of self-tapping grooves 170.

[0065] In the case where the number of cutting edges 120 is different from the number of self-tapping grooves 170, the self-tapping grooves 170 and the cutting edges 120 can be staggered, or the inner side walls of some self-tapping grooves 170 can be arranged to coincide with the side walls of the cutting edges 120.

[0066] In the case where the number of cutting edges 120 is the same as the number of self-tapping grooves 170, the self-tapping grooves 170 and the cutting edges 120 can be staggered, or the inner side walls of the self-tapping grooves 170 can be arranged to coincide with the side walls of the cutting edges 120. In this embodiment, it is preferably to arrange the inner side walls of the self-tapping grooves 170 to coincide with the side walls of the cutting edges 120, that is, the second self-tapping surface 172 and the second cutting surface 140 are located in the same plane. Such a setting facilitates the manufacturing process of the self-tapping grooves 170 and the cutting edges 120, and at the same time can make the process of the cutting edges 120 drilling on the bone smoother.

[0067] In addition, the part of the external thread 160 extending to the cutting edge 120 can directly extend to the drilling end face 110 or extend to the cutting edge 120. In the preferred embodiment, the external thread 160 partially extends to the cutting edge 120. When the external thread 160 extends to the cutting edge 120, the plane where the external thread 160 extends to the cutting edge 120 can be in the same plane as the second cutting surface 140 and the second self-tapping surface 172; it can also be in a different plane from the second cutting surface 140 and the second self-tapping surface 172. In this embodiment, the plane where the external thread 160 extends to the cutting edge 120, the second cutting surface 140, and the second self-tapping surface 172 are in the same plane; such a setting facilitates the manufacture of each component on the main carrier 100 and makes the process of drilling into the bone smoother.

[0068] In some embodiments, referring to Figure 3 as shown, a plurality of connecting surfaces 180 are provided on the side wall at the distal end of the main carrier 100. The connecting surfaces 180 are disposed between two adjacent cutting edges 120 and connect the two adjacent cutting edges 120. At the same time, the connecting surfaces 180 intersect with the drilling end face 110. The connecting surfaces 180 are inclined from the drilling end face 110 in the axial direction of the main carrier 100 towards the direction away from the axis of the main carrier 100. At the same time, the angle between the connecting surfaces 180 and the axis of the main carrier 100 is 15 - 30°. In the preferred embodiment, as Figure 6 shown, it is preferred to select the angle between the connecting surface 180 and the axis of the main carrier 100 to be 22°; the connecting surface 180 reduces the width of the drilling end face 110 in the radial direction of the main carrier 100, facilitating the process of drilling the main carrier 100 into the bone.

[0069] In a second aspect, the present invention also provides a medical drilling device. Referring to Figure 1 as shown, it includes the above-mentioned drill bit structure and a connecting rod 200. The main carrier 100 is disposed at the distal end of the connecting rod 200, which can be fixedly connected or detachably connected. In this embodiment, an integrally formed fixed connection method is adopted. A driving joint 210 is provided at the proximal end of the connecting rod 200. The driving joint 210 and the main carrier 100 can be detachably connected or fixedly connected. In this embodiment, a fixed connection between the driving joint 210 and the main carrier 100 is adopted. At the same time, the driving joint 210 is hollow, and in this embodiment, the inner diameter of the driving joint 210 is the same as the inner diameter of the main carrier 100; in addition, an embodiment in which the inner diameter of the driving joint 210 is different from the inner diameter of the main carrier 100 can also be selected, which will not be elaborated in this embodiment.

[0070] The cross-section of the drive joint 210 can be circular or polygonal. In this embodiment, the cross-section of the drive joint 210 is polygonal, and a square or hexagonal shape is selected. Such a setting enables the main carrier 100 to cooperate with an external quick-change handle to achieve quick replacement and facilitate the drilling process.

[0071] The specific implementation principle of a medical drilling device in this embodiment is as follows: During surgery, the guide pin is inserted into a predetermined position on the bone mass. The drive joint 210 is connected to the quick-release handle for applying power. The main carrier 100 is sleeved on the guide pin, and the main carrier 100 moves along the axis direction of the guide pin and rotates around the axis of the main carrier 100. During this process, the cutting edge 120 first contacts the bone mass and drills a hole in the bone mass. The external thread 160, self-tapping groove 170, etc. provided on the side wall of the main carrier 100 cooperate with the cutting edge 120 to jointly perform the drilling work. During this process, compared with a conventional drilling device, the structure in this solution will not grind or even cut the guide pin during drilling, is not prone to chipping, is more labor-saving, and is not prone to breakage when breaking through harder bone mass.

[0072] Although the embodiments of the present invention have been described in detail above, it is obvious to those skilled in the art that various modifications and changes can be made to these embodiments. However, it should be understood that such modifications and changes are all within the scope and spirit of the present invention described in the claims. Moreover, the present invention described herein can have other embodiments and can be implemented or realized in various ways.

Claims

1. A medical drill bit structure, characterized in that, It includes a main carrier (100), and the main carrier (100) is hollow inside; The distal end of the main carrier (100) is a drilling end face (110), and a cutting edge (120) protrudes from the drilling end face (110); The cutting edge (120) includes a first cutting surface (130), a second cutting surface (140) and a third cutting surface (150) that intersect pairwise. An angle is formed between the first cutting surface (130) and the second cutting surface (140). The third cutting surface (150) extends along the inner wall of the main carrier (100) towards the distal end of the main carrier (100), so that the vertical distance by which the cutting edge (120) protrudes from the drilling end face (110) is 0.05 - 1 mm.

2. The drill bit structure according to claim 1, wherein The first cutting surface (130) is circumferentially inclined around the drilling end face (110) and smoothly intersects with the drilling end face (110).

3. The drill bit structure according to claim 2, wherein, The angle between the first cutting surface (130) and the axis of the main carrier (100) is 75 - 85°.

4. The drill bit structure according to claim 1, wherein An external thread (160) is provided on the side wall of the main carrier (100), and the external thread (160) extends along the axial direction of the main carrier (100).

5. The drill bit structure according to claim 4, wherein, The external thread (160) has a cutting side wall (161), and there is a transition surface (162) between the cutting side wall (161) and the side wall of the main carrier (100).

6. The drill bit structure according to claim 5, wherein, The transition surface (162) is an arc surface, and the radius of the transition surface (162) is 0.5 - 1 mm.

7. The drill bit structure according to claim 5, characterized in that, The angle between the cutting side wall (161) and the axis of the main carrier (100) is 50 - 70°.

8. The drill bit structure according to claim 4, wherein The main carrier (100) further includes: A self - tapping groove (170) that axially divides the external thread (160) along the main carrier (100); The self - tapping groove (170) includes a first self - tapping surface (171) and a second self - tapping surface (172), and the angle between the first self - tapping surface (171) and the second self - tapping surface (172) is greater than 0° and less than 180°.

9. The drill bit structure according to claim 1, characterized in that, The number of the cutting edges (120) is multiple, and the multiple cutting edges (120) are evenly distributed circumferentially along the drilling end face (110).

10. The drill bit structure according to claim 1, characterized in that, Several connecting surfaces (180) are provided on the side wall at the distal end of the main carrier (100), and the connecting surfaces (180) are located between adjacent two of the cutting edges (120); The connecting surfaces (180) are inclined from the drilling end face (110) along the axial direction of the main carrier (100) towards the direction away from the axis of the main carrier (100).

11. The drill bit structure according to claim 10, wherein, The angle between the connecting surface (180) and the axis of the main carrier (100) is 15 - 30°.

12. A medical drilling device, characterized in that, It includes a connecting rod (200) and the drill bit structure according to any one of claims 1 - 11. The main carrier (100) is provided at the distal end of the connecting rod (200), and a drive joint (210) is provided at the proximal end of the connecting rod (200). The drive joint (210) is arranged at the proximal end of the connecting rod (200), and the cross - section of the drive joint (210) is circular or polygonal.

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