Skull drill

Abstract

The embodiment of the present application discloses a skull drill bit, which utilizes a plurality of first cutting edges arranged circumferentially on a positioning table to process a skull, so as to rotate and cut a counterbore at an outer end of a skull opening. Thus, on the one hand, the skull opening position can form a counterbore for accommodating an implant device fixing device, the volume of the implant device fixing device outside the skull is reduced, the postoperative aesthetics is improved, and wound healing is facilitated. On the other hand, the positioning table is matched with the reserved skull opening during the rotation and cutting, so that the counterbore can be close to or keep the same axis as the reserved skull opening, and the installation accuracy of the implant device fixing device is improved. On the other hand, the first cutting edge cuts the table surface of the counterbore into a curved surface, so that the shape of the counterbore can be more fitted to the curvature of the skull. After the mounting surface of the implant device fixing device is set to a corresponding shape, the adaptability of the implant device fixing device and the skull can be further ensured.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and more particularly to a skull drill bit. Background Technology

[0002] Electrodes implanted in the human brain can be used to treat various diseases, including Parkinson's disease, epilepsy, dystonia, and depression, by electrically stimulating the brain. Since the electrodes remain in the skull for extended periods, they require fixation devices. The surgery creates a craniotomy opening that penetrates the skull. Due to limitations in surgical instruments, the resulting opening often has poor compatibility with the fixation device, causing the device to protrude significantly from the skull, affecting aesthetics and wound healing. Summary of the Invention

[0003] In view of this, embodiments of the present invention provide a skull drill bit that uses a first cutting edge located on the cutting tool and a positioning table that cooperates therewith to machine a stepped hole located at the skull opening and having an arc-shaped table surface.

[0004] The skull drill bit of this invention includes:

[0005] A positioning platform is rotatably or fixedly mounted on the head of the skull drill bit and directly opposite the rotation axis of the skull drill bit.

[0006] Multiple cutting blades are arranged circumferentially along the head of the skull drill bit, and each cutting blade includes a first cutting edge. One end of the first cutting edge extends to the side wall of the positioning table, and the other end is inclined toward the table surface of the positioning table. At the same time, the first cutting edge is bent in the opposite direction to the table surface of the positioning table.

[0007] Furthermore, the skull drill bit has a chip-collecting area located between two adjacent cutting blades and adjacent to the first cutting edge and the positioning table.

[0008] Furthermore, the first cutting edge bends in the opposite direction to the cutting direction of the cutting tool, and forms the chip-receiving area at the connection position between the first cutting edge and the positioning table.

[0009] Furthermore, the cutting tool includes a first clearance surface, and the first cutting edge is located at the edge of the first clearance surface;

[0010] The first clearance surface faces the cutting direction of the cutting tool.

[0011] Furthermore, the cutting tool includes a second clearance surface, and the first cutting edge is formed at the intersection of the second clearance surface and the first clearance surface;

[0012] The second clearance surface is located on the side of the cutting tool close to the positioning table surface, and the side of the second clearance surface away from the first cutting edge is inclined in a direction away from the positioning table surface.

[0013] Furthermore, the cutting tool has a third clearance surface facing outward in the circumferential direction, the third clearance surface intersecting with the first clearance surface to form a second cutting edge, the second cutting edge being disposed in the thickness direction of the cutting tool, and the side of the third clearance surface away from the second cutting edge being inclined toward the rotation axis of the skull drill bit.

[0014] Furthermore, the second cutting edge includes a tip;

[0015] The end of the second cutting edge near the positioning table surface is connected to the end of the first cutting edge away from the positioning table to form the tip.

[0016] Furthermore, the end of the second cutting edge furthest from the tip is inclined toward the axis of rotation of the skull drill bit.

[0017] Furthermore, the sidewall of the positioning platform includes a cylindrical surface;

[0018] The plurality of cutting tools are three cutting tools, which are evenly distributed along the circumference of the positioning table.

[0019] Furthermore, the skull drill bit also includes:

[0020] The drive handle includes a drive end and a connecting end arranged opposite to each other. The connecting end and the positioning platform are located on opposite sides of the head of the skull drill bit. The drive end has a guide step and a fixing post. The guide step protrudes from the end face of the drive end. The fixing post protrudes from the guide step and has a connecting groove circumferentially formed on the fixing post.

[0021] The skull drill bit of this invention utilizes multiple first cutting edges arranged circumferentially on a positioning platform to machine the skull, thereby creating a countersunk hole at the outer end of the cranial opening. This serves two purposes: firstly, it allows for the formation of a countersunk hole at the cranial opening to accommodate an implantable device fixation device, reducing its volume on the outer side of the skull, improving postoperative aesthetics, and promoting wound healing. Secondly, during the rotary cutting process, the positioning platform cooperates with the pre-reserved cranial opening, ensuring that the countersunk hole is close to or concentric with it, thus improving the installation accuracy of the implantable device fixation device. Furthermore, the first cutting edges shape the countersunk hole's platform into an arc, allowing the hole's shape to better conform to the curvature of the skull. By setting the mounting surface of the implantable device fixation device to a corresponding shape, the adaptability of the implantable device fixation device to the skull can be further guaranteed. Attached Figure Description

[0022] The above and other objects, features and advantages of the present invention will become clearer from the following description of embodiments of the invention with reference to the accompanying drawings, in which:

[0023] Figure 1 This is a three-dimensional schematic diagram of the implantable device fixation device in the related technology in the state before and after wearing;

[0024] Figure 2 This is a cross-sectional schematic diagram of an implantable device fixation device in related technologies.

[0025] Figure 3 This is a three-dimensional schematic diagram of the drilling state of the skull drill bit according to an embodiment of the present invention;

[0026] Figure 4 This is an embodiment of the present invention. Figure 3 Schematic diagram of the cross section at point DD;

[0027] Figure 5 This is a cross-sectional enlarged schematic diagram of the drilling state of the skull drill bit according to an embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of one side of the skull drill bit according to an embodiment of the present invention;

[0029] Figure 7 This is a schematic diagram of the structure of the other side of the skull drill bit according to an embodiment of the present invention;

[0030] Figure 8 This is a schematic diagram of the structure of another side of the skull drill bit according to an embodiment of the present invention.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1-Cutting tool;

[0033] 11-First cutting edge; 12-Chip-receiving area; 13-First clearance surface; 14-Second clearance surface; 15-Third clearance surface; 16-Second cutting edge; 17-Tip;

[0034] 2-Positioning stage;

[0035] 3-Drive handle; 31-Drive end; 311-Guide step; 312-Fixing post; 3121-Connecting groove; 32-Connecting end;

[0036] A-Head; A1-Skull; A2-Craniotomy; A3-Tabletop;

[0037] B - Rotation axis; C - Implantable device fixation device. Detailed Implementation

[0038] The present invention is described below based on embodiments, but the invention is not limited to these embodiments. In the detailed description of the invention below, certain specific details are described in detail. Those skilled in the art will fully understand the invention even without these details. To avoid obscuring the essence of the invention, well-known methods, processes, flows, elements, and circuits are not described in detail.

[0039] Furthermore, those skilled in the art should understand that the accompanying drawings provided herein are for illustrative purposes only and are not necessarily drawn to scale.

[0040] Unless the context explicitly requires it, words such as "including" or "contains" throughout the application should be interpreted as including rather than exclusive or exhaustive; that is, meaning "including but not limited to".

[0041] In the description of this invention, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0042] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," 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 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 expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0043] For ease of explanation, spatially related terms such as “inside,” “outside,” “below,” “below,” “lower,” “above,” “upper,” etc., are used herein to describe the relationship between one element or feature illustrated in the figure and another. It will be understood that spatially related terms may be intended to encompass different orientations of the device in use or operation besides those depicted in the figure. For example, if the device in the figure is flipped, an element described as “below” or “below” another element or feature would then be positioned “above” that other element or feature. Thus, the exemplified term “below” can encompass both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially related descriptive terms used herein should be interpreted accordingly.

[0044] In implantation surgery, an incision is made in the body to insert an implanted device, including electrodes, into the body. Taking brain electrode implantation as an example, an incision, known as craniotomy A2, is made in the patient's skull A1. Craniotomy A2 connects the patient's brain to the outside world.

[0045] The existing electrode fixation device protrudes from the skull A1 after installation. The portion protruding from the outer side of the skull can further affect parts of the body such as hair or scalp, causing damage and ulceration in the cranial opening A2 and surrounding areas. At the same time, the patient's activities while wearing the device can also affect the electrodes and electrode fixation device. For example, when the hand moves near the head A, it may bump into the electrode fixation device.

[0046] Figure 1 and Figure 2 These are three-dimensional schematic diagrams of the implantable device fixation device in the relevant technology before and after wearing, as well as a cross-sectional schematic diagram of the implantable device fixation device. For example... Figure 1-2 As shown, in order to allow the implanted device fixation device to sink into the inside of cranial incision A2, this embodiment has a stepped hole machined at the location of cranial incision A2 (e.g., Figure 1 As shown in the middle right figure, the platform A3 of the stepped hole allows the implantable device fixation device to sink into it. The top of the implantable device fixation device within the stepped hole can maintain a good alignment with the shape of the patient's head A (e.g., ...). Figure 1 (As shown in the middle left figure). Figure 2 This is an implantable device fixation device that can be installed in the aforementioned stepped hole. The implantable device fixation device in the figure has an overall flat structure, and the bottom of the flanges on both sides can be recessed into the platform A3 of the aforementioned stepped hole. For this purpose, the bottom of the flanges is set as an arc surface adapted to the platform A3.

[0047] Figure 3-4 These are a three-dimensional schematic diagram and a cross-sectional schematic diagram of the drilling state of the skull drill bit. Figure 6-8 This is a schematic diagram of the skull drill bit from different orientations. The head of the skull drill bit in the diagram has a cutting tool, and the tail of the skull drill bit faces upwards and can be driven to rotate by hand crank or motor (the drive mechanism is not shown in the diagram), thereby causing the head to perform a rotary cutting motion on skull A1. Figure 5 This is an enlarged cross-sectional view of the skull drill bit during the drilling process. The table A3 in the figure is formed after the drill cuts away the skull.

[0048] In some implementations, such as Figure 1-8As shown, the skull drill bit in this embodiment includes a positioning platform 2 and multiple cutting blades 1. The positioning platform 2 is disposed at the head of the skull drill bit and is directly opposite the rotation axis B of the skull drill bit. The multiple cutting blades 1 are arranged circumferentially along the head of the skull drill bit, and each cutting blade 1 includes a first cutting edge 11. One end of the first cutting edge 11 is connected to the side wall of the positioning platform 2, and the other end is inclined toward the table surface of the positioning platform 2. At the same time, the first cutting edge 11 is bent in the opposite direction to the table surface of the positioning platform 2.

[0049] The bending direction of the first cutting edge 11 in this embodiment is as follows: Figure 5 The bending direction of the cutting blade 1 is shown. The cutting blade 1 has a first arc in this bending direction, meaning the plane containing this first arc passes through the rotation axis B of the cranial drill. When the cranial drill rotates, its positioning platform 2 passes through the pre-reserved cranial opening A2, thereby causing the side wall of the positioning platform 2 to engage with the inner wall of the pre-reserved cranial opening A2, ensuring that the rotation axis B of the cutting blade 1 coincides with or nearly coincides with the center of the pre-reserved cranial opening A2. The inner diameter of this pre-reserved cranial opening can be between 12mm and 20mm.

[0050] In other embodiments, the positioning table 2 is rotatably mounted on the head of the skull drill. That is, the positioning table 2 has rotational freedom on the axis of rotation B. In this case, one end of the first cutting edge 11 extends to the side wall of the positioning table 2, thereby ensuring the curvature integrity of the machined table surface A3. Thus, when machining the table surface A3 with the skull drill, the rotatable positioning table 2 allows it to remain stationary or nearly stationary within the cranial opening A2, avoiding friction between the side wall of the positioning table 2 and the side wall of the cranial opening A2, and preventing secondary damage.

[0051] Optionally, the positioning stage 2 can be rotatably connected to the head of the skull drill bit via a plastic bearing (not shown in the figure).

[0052] The skull drill bit of this embodiment uses multiple first cutting edges 11 arranged circumferentially on the positioning platform 2 to process the skull A1, thereby rotary-cutting a countersunk hole at the outer end of the cranial opening A2. This achieves two advantages: firstly, it allows the cranial opening A2 to form a countersunk hole for accommodating an implantable device fixation device, reducing its volume on the outer side of the skull A1, improving postoperative aesthetics, and promoting wound healing. Secondly, during rotary cutting, the positioning platform 2, by cooperating with the pre-reserved cranial opening A2, ensures that the countersunk hole is close to or concentric with the pre-reserved cranial opening A2, thereby improving the installation accuracy of the implantable device fixation device. Furthermore, the first cutting edges 11 cut the countersunk hole's platform surface A3 into an arc shape, allowing the shape of the countersunk hole to better conform to the curvature of the skull. After setting the mounting surface of the implantable device fixation device to a corresponding shape, the adaptability of the implantable device fixation device to the skull A1 can be further guaranteed.

[0053] In some implementations, such as Figure 1-8 As shown, the skull drill bit has a chip-collecting region 12, which is located between two adjacent cutting blades 1 and adjacent to the first cutting edge 11 and the positioning table 2. In this embodiment, the chip-collecting region 12 is disposed immediately adjacent to the first cutting edge 11, that is, disposed in the rotary cutting direction of the first cutting edge 11 (e.g., ...). Figure 6 (As indicated by the arrow in the image). Thus, when the cutting blade 1 cuts the skull A1, the resulting skull A1 debris can be contained in the debris-containing area 12, facilitating the cleaning and handling of skull debris during surgery and reducing the occurrence of skull A1 debris falling off.

[0054] Furthermore, the first cutting edge 11 bends in the opposite direction of the cutting blade 1's rotation, forming a chip-collecting area 12 at the connection point between the first cutting edge 11 and the positioning table 2. In this embodiment, the first cutting edge 11 also has a second curvature in its rotational direction. This second curvature prevents the skull A1 debris generated by the first cutting edge 11 from scattering outwards, but instead causes it to converge towards the connection point between the cutting blade 1 and the positioning table 2, thereby further improving the cleanliness of the surgery and facilitating the centralized treatment of the skull A1 debris located in the chip-collecting area 12.

[0055] In some implementations, such as Figure 1-8 As shown, the cutting tool 1 includes a first clearance surface 13, and a first cutting edge 11 is located at the edge of the first clearance surface 13. The first clearance surface 13 faces the cutting direction of the cutting tool 1. Specifically, in this embodiment, the bottom of the first clearance surface 13 is used to form the first cutting edge 11, and the shape of the first clearance surface 13 is adapted to both the first curvature and the second curvature of the first cutting edge 11.

[0056] Furthermore, the cutting tool 1 includes a second clearance surface 14, the intersection of which with the first clearance surface 13 forms a first cutting edge 11. The second clearance surface 14 is located on the side of the cutting tool 1 closest to the table surface 2, and the side of the second clearance surface 14 away from the first cutting edge 11 is inclined in a direction away from the table surface 2 (e.g., Figure 8 (As shown in region I). In this embodiment, the second clearance surface 14 is located at the bottom of the cutting blade 1. This position will be directly opposite the table surface A3 during the rotary cutting process. In order to reduce friction with the table surface A3 and to make the first cutting edge 11 sharper, the second clearance surface 14 is configured to rise in a direction away from the table surface A3.

[0057] In some implementations, such as Figure 1-8 As shown, the cutting tool 1 has a third clearance surface 15 facing outward in the circumferential direction. The third clearance surface 15 intersects with the first clearance surface 13 to form a second cutting edge 16. The second cutting edge 16 is disposed in the thickness direction of the cutting tool 1. The side of the third clearance surface 15 away from the second cutting edge 16 is inclined towards the rotation axis B of the skull drill bit (e.g., Figure 8 (As shown in region III). In the above embodiment, the first cutting edge 11 can cut the skull A1 to form a platform A3, while the second cutting edge 16 provided in this embodiment can also trim the sidewall of the platform A3 as the skull drill continuously feeds into the skull. This allows the skull drill to form an arc-shaped platform A3 after drilling, while the sidewall of the stepped hole also has high dimensional accuracy, thus providing a mounting base for the implantable device fixation device. Simultaneously, the avoidance area formed by the third avoidance surface 15 can effectively prevent circumferential friction between the cutting blade 1 and the skull A1.

[0058] Preferably, those skilled in the art can configure the length of the second cutting edge 16 in this embodiment, that is, configure the dimension of the third clearance surface 15 in the thickness direction of the cutting tool 1, so that it can exactly match the depth of the platform A3 of the stepped hole. Therefore, when the operator drills a hole in the skull A1, the appropriate drilling depth can be determined based on the height of the third clearance surface 15 or the length of the second cutting edge 16. That is, the drilling operation is immediately stopped when the top of the second cutting edge 16 just penetrates the skull A1.

[0059] Furthermore, the second cutting edge 16 includes a tip 17. The end of the second cutting edge 16 near the table surface of the positioning table 2 is connected to the end of the first cutting edge 11 away from the positioning table 2 to form the tip 17. In this embodiment, the first cutting edge 11 and the second cutting edge 16 of the cutting tool 1 are arranged adjacent to each other, thereby forming a tip located at the tip of the cutting tool 1. When the skull drill bit is fed towards the skull A1, this tip 17 can effectively improve the cutting ability of the skull drill bit and increase cutting efficiency.

[0060] Furthermore, the end of the second cutting edge 16 furthest from the tip 17 is inclined toward the rotation axis B of the skull drill bit (e.g., Figure 8 (As shown in region II). The tip 17 in this embodiment consists of three edges: the bottom of the first clearance surface 13 (first cutting edge 11), the bottom of the second clearance surface 14, and the second cutting edge 16. By configuring the angle of the second cutting edge 16, the tip 17 becomes sharper in both the direction of movement and the thickness direction of the cutting tool 1, further improving its ability to trim the sidewall of the table A3.

[0061] In some implementations, such as Figure 1-8 As shown, the sidewall of the positioning stage 2 includes a cylindrical surface. The multiple cutting blades 1 consist of three cutting blades 1, which are evenly distributed along the circumference of the positioning stage 2. In cutting the skull A1, the cutting blades 1 in this embodiment can generate the same cutting force in the circumference, thereby ensuring their stability in the feed direction and preventing the skull drill bit from wobbling during drilling, which would otherwise lead to inconsistent circumferential depths of the stepped hole's platform A3.

[0062] In other embodiments, the number of cutting blades 1 is four, five, or more. Those skilled in the art can select the appropriate number based on the diameter of the cranial opening A2, thereby maximizing cutting efficiency.

[0063] In some implementations, such as Figure 1-8 As shown, the skull drill bit also includes a drive shank 3. The drive shank 3 includes a drive end 31 and a connecting end 32 disposed opposite to each other. The connecting end 32 and the positioning platform 2 are located on opposite sides of the skull drill bit head. The drive end 31 has a guide step 311 and a fixing post 312. The guide step 311 protrudes from the end face of the drive end 31, and the fixing post 312 protrudes from the guide step 311. A connecting groove 3121 is circumferentially formed on the fixing post 312. Taking a motor as an example, when driving the skull drill bit, the skull drill bit can be connected to the drive mechanism via the drive shank 3 in this embodiment, using the connecting groove 3121, to position the skull drill bit axially. Then, the torque in the rotational direction can be transmitted using the guide step 311 of the drive end 31. Figure 7 The diagram shows a guide step 311 structure with two guide surfaces facing both sides of the drive shank 3. The torque of the motor can be transmitted to the skull drill bit via these two guide surfaces.

[0064] Electrode implantation surgery can be performed using the cranial drill bit described in the above embodiments, such as... Figure 1-8 As shown, in one optional implementation, the electrode implantation surgery includes: First, creating a pre-reserved cranial incision in the patient's skull A1, and aligning a cranial drill corresponding to the pre-reserved cranial incision with the incision. The positioning stage 2 is then inserted into the pre-reserved cranial incision. Next, the cranial drill is rotated, applying pressure to the skull A1. During the rotary cutting process of the cutting blade 1, skull debris from the debris-collecting area 12 is continuously cleaned. Finally, after drilling is completed, the corresponding electrode fixation device is installed within the cranial incision A2.

[0065] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. For those skilled in the art, the present invention can be modified and varied in various ways. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the present invention should be included within the scope of protection of the present invention.

Claims

1. A cranial drill bit, characterized in that, The skull drill bit comprises: a positioning platform (2) arranged rotatably or fixedly on the head of the skull drill bit and opposite to the rotation axis (B) of the skull drill bit; a plurality of cutting blades (1) arranged circumferentially on the head of the skull drill bit, and the cutting blade (1) comprises a first cutting edge (11), one end of the first cutting edge (11) extends to the side wall position of the positioning platform (2), the other end is inclined towards the direction of the table surface of the positioning platform (2), and the first cutting edge (11) is bent towards the opposite direction of the table surface of the positioning platform (2); the skull drill bit has a chip containing area (12) located between two adjacent cutting blades (1); the cutting blade (1) comprises a first relief surface (13), a second relief surface (14) and a third relief surface (15), the first relief surface (13) is towards the rotation direction of the cutting blade (1), the second relief surface (14) is located on the side of the cutting blade (1) close to the table surface of the positioning platform (2), and the third relief surface (15) is located on the circumference of the cutting blade (1) and is towards the outside; the first relief surface (13) has a first edge and a second edge, the first edge intersects with the second relief surface (14) to form the first cutting edge (11), the first cutting edge (11) is bent towards the opposite direction of the rotation of the cutting blade (1), the second edge intersects with the third relief surface (15) to form a second cutting edge (16), the second cutting edge (16) is arranged in the thickness direction of the cutting blade (1), and one end of the second cutting edge (16) close to the table surface of the positioning platform (2) is connected with the other end of the first cutting edge (11) away from the positioning platform (2) to form a tip (17); the shape of the first relief surface (13) is adapted to the bending direction of the first cutting edge (11), and in the thickness direction of the cutting blade (1), the first relief surface (13) penetrates through the cutting blade (1).

2. The cranial drill bit of claim 1, wherein, The chip containing area (12) is located at the position adjacent to the first cutting edge (11) and the positioning platform (2).

3. The cranial drill bit of claim 2, wherein, The connection position of the first cutting edge (11) and the positioning platform (2) forms the chip containing area (12).

4. The cranial drill bit of claim 1, wherein, The side of the second relief surface (14) away from the first cutting edge (11) is inclined away from the table surface of the positioning platform (2).

5. The cranial drill bit of claim 1, wherein, The side of the third relief surface (15) away from the second cutting edge (16) is inclined towards the rotation axis (B) of the skull drill bit.

6. The cranial drill bit of claim 1, wherein, The end of the second cutting edge (16) away from the tip (17) is inclined towards the rotation axis (B) of the skull drill bit.

7. The cranial drill bit of claim 1, wherein, The side wall of the positioning platform (2) comprises a cylindrical surface; the plurality of cutting blades (1) are three cutting blades (1), and the three cutting blades (1) are uniformly distributed circumferentially on the positioning platform (2).

8. The cranial drill bit of claim 1, wherein, The skull drill bit further comprises: The drive handle (3) includes a drive end (31) and a connecting end (32) arranged opposite to each other. The connecting end (32) and the positioning platform (2) are located on opposite sides of the head of the skull drill bit. The drive end (31) has a guide step (311) and a fixing post (312). The guide step (311) protrudes from the end face of the drive end (31). The fixing post (312) protrudes from the guide step (311). The fixing post (312) has a connecting groove (3121) in the circumferential direction.

Images