Drill bit and bone drill device

Abstract

The utility model relates to a drill bit and bone drill device, can install the elastic ring on the second installation groove of shell and form the pre -installation whole, when pre -installation whole opposite connecting post moves to make second installation groove and first installation groove along the radial direction corresponding intercommunication and forms the limiting cavity, the elastic ring contracts under the reset force of self and one part is arranged in first installation groove and another part is arranged in second installation groove, at this moment, the two outer side walls of elastic ring along the axial direction respectively with the two inner side walls of limiting cavity opposite abutment limit cooperation, and then can limit shell relative connecting post movement in the axial direction, in turn can avoid the drill bit to take place axial scattering in the operation process. Meanwhile, through the wrapping of shell to elastic ring and the inner side wall of limiting cavity to the axial movement of elastic ring, also can not appear the medical accident of spare part falling and missing in the patient's body.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a drill bit and bone drill device. Background Technology

[0002] Bone drills are primarily used for drilling and other operations on bone tissues such as the skull. The drill bit consists of a housing and a connecting post, with the housing fitted onto the outer wall of the connecting post. To prevent relative axial displacement between the housing and the connecting post, the traditional method involves radially connecting them with screws. However, screw connections are unreliable; screws coming loose can cause the entire drill bit to axially disintegrate. Furthermore, due to their small size, screws are more likely to be left inside the patient during surgery, potentially leading to medical accidents. Current solutions involve adding a locking protrusion to the housing and a locking groove to the connecting post, using the engagement of the protrusion and groove to achieve axial connection and fixation. However, this method still carries the risk of axial disintegration. Utility Model Content

[0003] Therefore, it is necessary to provide a drill bit and bone drill device to address the problem of axial breakage of drill bits.

[0004] The technical solution is as follows:

[0005] On the one hand, a drill bit is provided, comprising:

[0006] A drill bit used for drilling bone tissue;

[0007] A connecting post is connected to the drill head drive, and the outer side wall of the connecting post is provided with a first mounting groove in the circumferential direction;

[0008] A housing, wherein the housing is fitted onto the outer periphery of the connecting post, and the inner sidewall of the housing is provided with a second mounting groove along the circumferential direction, the second mounting groove and the first mounting groove being radially corresponding and communicating to form an annular limiting cavity; and

[0009] The elastic retaining ring has a break to allow its inner diameter to be adjustable. The elastic retaining ring is disposed within the limiting cavity, with a portion of the elastic retaining ring disposed within the first mounting groove and another portion of the elastic retaining ring disposed within the second mounting groove.

[0010] The technical solution will be further explained below:

[0011] In one embodiment, the first mounting groove includes a first groove and a second groove that are interconnected, the depth of the first groove is greater than the depth of the second groove, and the elastic retaining ring is provided with a retaining protrusion that engages with the first groove.

[0012] In one embodiment, the connecting post has a transmission end that is assembled with a power handle, the first groove is disposed near the transmission end relative to the second groove, and the elastic retaining ring has a guide surface on the side away from the retaining protrusion that guides and engages with the outer wall of the connecting post.

[0013] In one embodiment, the connecting column is further provided with a first limiting part, which is axially spaced from the first mounting groove, and the inner sidewall of the housing is further provided with a second limiting part, which is axially limited and engaged with the first limiting part.

[0014] In one embodiment, the first limiting portion includes a limiting protrusion, and the second limiting portion includes a limiting flange, wherein the limiting protrusion and the limiting flange abut against each other along the axial direction.

[0015] In one embodiment, the outer side wall of the connecting column is further provided with a third limiting part that is spaced apart from the first limiting part along the axial direction, the first mounting groove is provided between the first limiting part and the third limiting part, and the outer shell is further provided with a fourth limiting part that limits and engages with the third limiting part.

[0016] In one embodiment, the third limiting portion includes a limiting step, and the end of the housing forms the fourth limiting portion, with the end of the housing engaging with the limiting step.

[0017] In one embodiment, the connecting column includes an inner drill bit and an outer drill bit, the outer drill bit being drivenly connected to the inner drill bit, the inner drill bit being provided with a first limiting part, and the outer drill bit being provided with a first mounting groove.

[0018] In one embodiment, the outer drill bit has an assembly end that is assembled with the inner drill bit, the first limiting portion has a first limiting surface and a second limiting surface that are opposite each other, the second limiting portion is axially limited to the first limiting surface, and the assembly end is axially limited to the second limiting surface.

[0019] On the other hand, a bone drill device is provided, including a power handle and the drill bit, wherein the power handle is kinetically connected to the connecting column.

[0020] In the drill and bone drill device of the above embodiment, the elastic retaining ring can be first installed on the second mounting groove of the outer shell, so that the elastic retaining ring and the outer shell are assembled to form a pre-assembled whole. Then, the pre-assembled whole is sleeved on the outer side wall of the connecting column from one end of the connecting column along the axial direction. During the sleeve process, the elastic retaining ring is subjected to compressive force, which causes the fracture surface to enlarge and the inner diameter of the elastic retaining ring to increase. This allows the pre-assembled whole to be smoothly sleeved on the outer side wall of the connecting column without interference or obstruction. When the pre-assembled whole moves axially relative to the connecting column until the second mounting groove and the first mounting groove are radially connected to form a limiting cavity, the elastic retaining ring contracts under its own restoring force, with part of it set in the first mounting groove and the other part set in the second mounting groove. At this time, the two outer side walls of the elastic retaining ring along the axial direction respectively abut against the two inner side walls opposite to the limiting cavity and limit the movement of the outer shell relative to the connecting column in the axial direction, thereby preventing the drill from axially disintegrating during the operation. At the same time, by enclosing the elastic retaining ring with the outer shell and limiting the axial movement of the elastic retaining ring with the inner wall of the limiting cavity, there will be no medical accidents caused by parts falling off and being left inside the patient's body. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of a drill bit according to one embodiment;

[0024] Figure 2 for Figure 1 An axial sectional view of the drill bit;

[0025] Figure 3 for Figure 2 A magnified view of part A of the drill bit.

[0026] Explanation of reference numerals in the attached figures:

[0027] 10. Drill bit; 100. Connecting post; 101. External drill bit; 1011. Assembly end; 102. Internal drill bit; 103. Transmission end; 110. First mounting groove; 111. First recess; 112. Second recess; 120. First limiting part; 121. First limiting surface; 122. Second limiting surface; 130. Third limiting part; 200. Outer shell; 210. Second mounting groove; 220. Second limiting part; 230. Fourth limiting part; 300. Elastic retaining ring; 310. Break; 320. Snap-fit ​​protrusion; 330. Guide surface; 400. Limiting cavity. Detailed Implementation

[0028] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0029] like Figure 1 and Figure 2 As shown, in one embodiment, a bone drilling device is provided, including a power handle (not shown) and a drill bit 10. The power handle is tractively connected to the drill bit 10, thereby transmitting power to the drill bit 10 to drive it to rotate at high speed, enabling surgical operations such as drilling into bone tissues like the skull. Furthermore, during the procedure, the drill bit 10 will not axially disintegrate, and there is no risk of medical accidents involving parts being left inside the patient.

[0030] Optionally, the transmission connection between the power handle and the drill bit 10 can be achieved through a plug-in connection or other means. Since this is existing technology, it will not be elaborated or enumerated here.

[0031] It should be noted that the power handle can use an existing structure, which is already existing technology and will not be elaborated or listed here.

[0032] like Figures 1 to 3 As shown, in one embodiment, a drill bit 10 is provided, including a drill bit, a connecting post 100, a housing 200, and a resilient retaining ring 300.

[0033] Among them, the drill bit is used to drill bone tissue to complete operations such as drilling.

[0034] Alternatively, the drill bit can use an existing structure, which will not be elaborated or exhaustively listed here.

[0035] The connecting post 100 can be driven to rotate via a power handle to perform operations such as drilling into bone tissue like the skull. Specifically, the connecting post 100 is driven to a drill head to perform operations such as drilling into bone tissue like the skull. Figure 3 As shown, the outer side wall of the connecting column 100 is provided with a first mounting groove 110 along the circumferential direction.

[0036] like Figure 3 As shown, the outer shell 200 can be a hollow cylindrical structure or similar. The outer shell 200 can be fitted onto the outer periphery of the connecting post 100. Furthermore, a second mounting groove 210 is provided circumferentially on the inner wall of the outer shell 200. The second mounting groove 210 and the first mounting groove 110 are radially connected to form an annular limiting cavity 400.

[0037] Alternatively, the outer casing 200 can be made of materials such as plastic, as long as it meets the requirements for medical use, which will not be elaborated or listed here.

[0038] like Figure 1 and Figure 3 As shown, the elastic retaining ring 300 has a break 310, which allows the inner diameter of the elastic retaining ring 300 to be adjustable. Specifically, when the elastic retaining ring 300 is subjected to an external force, the size of the break 310 can change, thereby causing the inner diameter of the elastic retaining ring 300 to change accordingly. Furthermore, the elastic retaining ring 300 is disposed within the limiting cavity 400, and a portion of the elastic retaining ring 300 is disposed within the first mounting groove 110, while another portion of the elastic retaining ring 300 is disposed within the second mounting groove 210.

[0039] In the above embodiment, the drill bit 10 can first install the elastic retaining ring 300 on the second mounting groove 210 of the housing 200, so that the elastic retaining ring 300 and the housing 200 are assembled to form a pre-assembled whole. Then, the pre-assembled whole is sleeved on the outer side wall of the connecting post 100 from one end along the axial direction of the connecting post 100. During the sleeved process, the elastic retaining ring 300 is subjected to compressive force, which causes the fracture 310 to become larger, thereby increasing the inner diameter of the elastic retaining ring 300. This allows the pre-assembled whole to be smoothly sleeved on the outer side wall of the connecting post 100 without interference or obstruction. When the pre-assembled integral relative connecting column 100 moves axially to such that the second mounting groove 210 and the first mounting groove 110 are radially connected to form a limiting cavity 400, the elastic retaining ring 300 contracts under its own restoring force, with one part set in the first mounting groove 110 and the other part set in the second mounting groove 210. At this time, the two outer sidewalls of the elastic retaining ring 300 along the axial direction respectively abut and limit the movement of the outer shell 200 relative to the connecting column 100, thereby preventing the drill bit 10 from axially disintegrating during surgery. At the same time, by having the outer shell 200 wrap around the elastic retaining ring 300 and the inner sidewall of the limiting cavity 400 limiting the axial movement of the elastic retaining ring 300, there will be no medical accidents of parts falling off and being left inside the patient's body.

[0040] Optionally, when the elastic retaining ring 300 is first installed on the second mounting groove 210 of the housing 200 to form a pre-assembled whole, part of the elastic retaining ring 300 is located in the second mounting groove 210, and part of the elastic retaining ring 300 protrudes out of the second mounting groove 210.

[0041] like Figure 3 As shown, in one embodiment, the first mounting groove 110 includes a first groove 111 and a second groove 112 that are interconnected. The depth of the first groove 111 (the depth along the radial direction) is greater than the depth of the second groove 112, and the elastic retaining ring 300 is provided with a retaining protrusion 320 that engages with the first groove 111. Thus, when the pre-assembled integral formed by the elastic retaining ring 300 and the outer shell 200 moves axially relative to the connecting post 100 until the second mounting groove 210, the first groove 111, and the second groove 112 are radially connected to form a limiting cavity 400, the elastic retaining ring 300 contracts under its own restoring force, causing the locking protrusion 320 to engage with the first groove 111. This allows the elastic retaining ring 300 to be stably and reliably installed in the limiting cavity 400, so that the two outer sidewalls of the elastic retaining ring 300 along the axial direction form a stable abutting limiting engagement with the two inner sidewalls of the limiting cavity 400, thereby restricting the movement of the outer shell 200 relative to the connecting post 100 in the axial direction, and thus preventing the drill bit 10 from axially disintegrating during the operation.

[0042] like Figure 2 and Figure 3 As shown, in one embodiment, the connecting post 100 has a transmission end 103 that is assembled with the power handle. Thus, the transmission end 103 can be assembled with the power handle to transmit torque. Furthermore, the first groove 111 is positioned closer to the transmission end 103 than the second groove 112. The elastic retaining ring 300 has a guide surface 330 on the side away from the locking protrusion 320 that guides and engages with the outer wall of the connecting post 100. Thus, when the pre-assembled assembly formed by the elastic retaining ring 300 and the housing 200 is fitted onto the outer wall of the connecting post 100 from the transmission end 103 along the axial direction of the connecting post 100, the guide surface 330 and the outer wall of the connecting post 100 provide a smoother and easier fit, preventing interference or contact. This ensures that the pre-assembled assembly can move axially relative to the connecting post 100 until the second mounting groove 210 and the first mounting groove 110 are radially connected to form a limiting cavity 400.

[0043] The guide surface 330 can be in the form of a guide slope or a guide arc surface, so that the elastic retaining ring 300 is flared on the side facing the transmission end 103, which facilitates the insertion of the transmission end 103.

[0044] like Figure 2 and Figure 3 As shown, in one embodiment, the connecting post 100 is further provided with a first limiting part 120, and the first limiting part 120 and the first mounting groove 110 are spaced apart along the axial direction. Furthermore, the inner sidewall of the outer shell 200 is also provided with a second limiting part 220, which is axially limited and engaged with the first limiting part 120. Thus, when the pre-assembled whole formed by the elastic retaining ring 300 and the outer shell 200 moves along the axial direction of the connecting post 100 until the second limiting part 220 and the first limiting part 120 are axially limited and engaged, it ensures that the second mounting groove 210 can accurately communicate radially with the first mounting groove 110 to form a limiting cavity 400. This ensures accurate assembly and positioning between the connecting post 100, the outer shell 200, and the elastic retaining ring 300, and ensures that the two outer sidewalls of the elastic retaining ring 300 along the axial direction can accurately form a stable abutting and limiting engagement with the two inner sidewalls opposite to the limiting cavity 400, respectively. At the same time, the limiting cooperation between the second limiting part 220 and the first limiting part 120 can also play the role of axial limiting. Combined with the axial limiting of the elastic retaining ring 300, the axial limiting effect is strengthened to prevent axial disintegration.

[0045] The axial limiting fit between the second limiting part 220 and the first limiting part 120 can be achieved through the contact fit between the surfaces.

[0046] In one embodiment, the first limiting part 120 includes a limiting protrusion, and the second limiting part 220 includes a limiting flange. The limiting protrusion and the limiting flange abut against each other along the axial direction. At this time, the second mounting groove 210 and the first mounting groove 110 are radially connected to form a limiting cavity 400, which ensures that the connecting post 100, the outer shell 200 and the elastic retaining ring 300 can be accurately assembled and positioned, and ensures that the two outer side walls of the elastic retaining ring 300 along the axial direction can accurately form a stable abutting limiting fit with the two inner side walls opposite to the limiting cavity 400.

[0047] like Figure 2 As shown, in one embodiment, the outer wall of the connecting post 100 is further provided with a third limiting part 130 spaced axially from the first limiting part 120, and a first mounting groove 110 is disposed between the first limiting part 120 and the third limiting part 130. The outer shell 200 is further provided with a fourth limiting part 230, which is in a limiting fit with the third limiting part 130. Thus, when the pre-assembled whole formed by assembling the elastic retaining ring 300 and the outer shell 200 moves axially along the connecting post 100 to such that the fourth limiting part 230 and the third limiting part 130 are in a limiting fit along the axial direction, it ensures that the second mounting groove 210 can accurately communicate radially with the first mounting groove 110 to form a limiting cavity 400, ensuring accurate assembly and positioning between the connecting post 100, the outer shell 200, and the elastic retaining ring 300, and ensuring that the two outer walls of the elastic retaining ring 300 axially can accurately form a stable abutting limiting fit with the two inner walls opposite to the limiting cavity 400, respectively. At the same time, the limiting cooperation between the fourth limiting part 230 and the third limiting part 130 can also play the role of axial limiting. Combined with the axial limiting of the elastic retaining ring 300, the axial limiting effect is strengthened to prevent axial disintegration.

[0048] Meanwhile, when the pre-assembled whole formed by the elastic retaining ring 300 and the outer shell 200 moves along the axial direction of the connecting column 100 to such that the second limiting part 220 and the first limiting part 120 are axially limited and engaged, and the fourth limiting part 230 and the third limiting part 130 are axially limited and engaged, it more accurately ensures that the second mounting groove 210 and the first mounting groove 110 are radially connected to form the limiting cavity 400, ensuring accurate assembly and positioning between the connecting column 100, the outer shell 200 and the elastic retaining ring 300, and ensuring that the two outer side walls of the elastic retaining ring 300 along the axial direction can accurately form a stable abutting limiting engagement with the two inner side walls opposite to the limiting cavity 400.

[0049] The axial limiting fit between the fourth limiting part 230 and the third limiting part 130 can be achieved through the contact fit between the surfaces.

[0050] like Figure 2As shown, in one embodiment, the third limiting part 130 includes a limiting step, and the end of the outer shell 200 forms a fourth limiting part 230. The end of the outer shell 200 abuts against the limiting step. At this time, the second mounting groove 210 and the first mounting groove 110 are radially connected to form a limiting cavity 400, ensuring accurate assembly and positioning between the connecting post 100, the outer shell 200, and the elastic retaining ring 300. This ensures that the two outer sidewalls of the elastic retaining ring 300 along the axial direction can accurately form a stable abutting limiting fit with the two inner sidewalls opposite to the limiting cavity 400. Furthermore, by directly utilizing the abutting fit between the end of the outer shell 200 and the limiting step, no additional processing of the outer shell 200 is required, saving processing and material costs.

[0051] like Figures 1 to 3 As shown, in one embodiment, the connecting post 100 includes an inner drill bit 102 and an outer drill bit 101, wherein the outer drill bit 101 is tractively connected to the inner drill bit 102. Thus, after the power handle is tractively connected to the inner drill bit 102, power is transmitted to the outer drill bit 101 through the inner drill bit 102, enabling the outer drill bit 101 to rotate at high speed for drilling operations such as drilling into bone tissues like the skull. The inner drill bit 102 is provided with a first limiting portion 120, and the outer drill bit 101 is provided with a first mounting groove 110. Thus, when the pre-assembled overall relative connecting column 100 moves axially to such that the second limiting part 220 and the first limiting part 120 are in a limiting engagement and the second mounting groove 210 and the first mounting groove 110 are radially connected to form a limiting cavity 400, the elastic retaining ring 300 contracts under its own restoring force and is partially disposed in the first mounting groove 110 and the other part disposed in the second mounting groove 210. At this time, the two outer side walls of the elastic retaining ring 300 in the axial direction respectively abut against the two inner side walls of the limiting cavity 400 for limiting engagement, thereby restricting the relative movement of the outer shell 200, the inner drill bit 102 and the outer drill bit 101 in the axial direction, thereby preventing the drill bit 10 from axially disintegrating during the operation.

[0052] The other parts of the outer drill bit 101 and the inner drill bit 102 can adopt existing structures, which will not be described in detail or listed here.

[0053] Optionally, the external drill bit 101 can be a split structure or an integral structure.

[0054] like Figure 3As shown, in one embodiment, the outer drill bit 101 has an assembly end 1011 for assembly with the inner drill bit 102. Furthermore, the first limiting portion 120 has opposing first limiting surfaces 121 and second limiting surfaces 122. The second limiting portion 120 is axially limited to the first limiting surface 121, and the assembly end 1011 is axially limited to the second limiting surface 122. Thus, the first limiting portion 120 can be used to axially limit the axial movement of the outer drill bit 101 relative to the inner drill bit 102 and the axial movement of the housing 200 relative to the inner drill bit 102. Combined with the axial limiting effect of the elastic retaining ring 300, the axial limiting effect is good, and the overall assembly structure is more compact.

[0055] It should be noted that "a certain body" or "a certain part" can be a portion of the corresponding "component," meaning that "a certain body" or "a certain part" is integrally formed and manufactured with the "other parts of the component"; or it can be an independent component that can be separated from the "other parts of the component," meaning that "a certain body" or "a certain part" can be manufactured independently and then combined with the "other parts of the component" to form a whole. The expression of "a certain body" or "a certain part" in this application is only one embodiment for ease of reading, and is not intended to limit the scope of protection of this application. Any technical solution that includes the above features and has the same function should be understood as an equivalent technical solution of this application.

[0056] It should be noted that the components included in the terms "unit," "component," "mechanism," and "device" of this application can be flexibly combined, enabling modular production according to actual needs and facilitating modular assembly. The division of the above-mentioned components in this application is merely one embodiment for ease of reading and is not intended to limit the scope of protection of this application. Any solution that includes the above-mentioned components and has the same function should be understood as an equivalent technical solution of this application.

[0057] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. The term "and / or" used in this utility model includes any and all combinations of one or more of the related listed items.

[0058] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0059] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0060] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0061] It should be noted that when a component is referred to as "fixed to," "set on," "fixed to," or "mounted on" another component, it can be directly on the other component or there may be an intervening component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intervening component. Furthermore, when a component is considered to be "fixed transmission connection" to another component, the two can be fixed in a detachable or non-detachable manner, as long as power transmission can be achieved, such as sleeve, snap-fit, integral molding, welding, etc., which can be achieved in the prior art and will not be elaborated here. When a component is perpendicular or approximately perpendicular to another component, it means that the two are ideally perpendicular, but due to the influence of manufacturing and assembly, there may be a certain degree of perpendicularity error. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation. The term "and / or" used herein includes any and all combinations of one or more of the associated listed items.

[0062] It should also be understood that, in interpreting the connection or positional relationships of components, although not explicitly described, connection and positional relationships are interpreted to include a range of error, which should be within the acceptable deviation range of a specific value as determined by a person skilled in the art. For example, "approximately," "about," or "substantially" can mean within one or more standard deviations, without limitation herein.

[0063] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0064] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A drill bit, characterized in that, include: A drill bit used for drilling bone tissue; A connecting post is connected to the drill head drive, and the outer side wall of the connecting post is provided with a first mounting groove in the circumferential direction; The outer shell is sleeved on the outer periphery of the connecting column, and the inner sidewall of the outer shell is provided with a second mounting groove along the circumferential direction. The second mounting groove and the first mounting groove are radially connected to form an annular limiting cavity. as well as The elastic retaining ring has a break to allow its inner diameter to be adjustable. The elastic retaining ring is disposed within the limiting cavity, with a portion of the elastic retaining ring disposed within the first mounting groove and another portion of the elastic retaining ring disposed within the second mounting groove.

2. The drill bit according to claim 1, characterized in that, The first mounting groove includes a first groove and a second groove that are interconnected. The depth of the first groove is greater than the depth of the second groove. The elastic retaining ring is provided with a retaining protrusion that engages with the first groove.

3. The drill bit according to claim 2, characterized in that, The connecting post has a transmission end that is assembled with the power handle. The first groove is positioned close to the transmission end relative to the second groove. The elastic retaining ring has a guide surface on the side away from the retaining protrusion that guides and engages with the outer wall of the connecting post.

4. The drill bit according to any one of claims 1 to 3, characterized in that, The connecting column is also provided with a first limiting part, which is axially spaced from the first mounting groove. The inner sidewall of the outer shell is also provided with a second limiting part, which is axially limited and engaged with the first limiting part.

5. The drill bit according to claim 4, characterized in that, The first limiting part includes a limiting protrusion, and the second limiting part includes a limiting flange, wherein the limiting protrusion and the limiting flange abut against each other along the axial direction.

6. The drill bit according to claim 4, characterized in that, The outer side wall of the connecting column is also provided with a third limiting part that is spaced apart from the first limiting part along the axial direction. The first mounting groove is provided between the first limiting part and the third limiting part. The outer shell is also provided with a fourth limiting part that limits and cooperates with the third limiting part.

7. The drill bit according to claim 6, characterized in that, The third limiting part includes a limiting step, and the end of the outer shell forms the fourth limiting part, with the end of the outer shell engaging with the limiting step.

8. The drill bit according to claim 4, characterized in that, The connecting column includes an inner drill bit and an outer drill bit. The outer drill bit is connected to the inner drill bit in a transmission manner. The inner drill bit is provided with the first limiting part, and the outer drill bit is provided with the first mounting groove.

9. The drill bit according to claim 8, characterized in that, The outer drill bit has an assembly end that is assembled with the inner drill bit. The first limiting part has a first limiting surface and a second limiting surface that are opposite each other. The second limiting part is axially limited and engaged with the first limiting surface. The assembly end is axially limited and engaged with the second limiting surface.

10. A bone drill device, characterized in that, It includes a power handle and a drill bit as described in any one of claims 1 to 9, wherein the power handle is kinetically connected to the connecting column.

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