Skull drill

Abstract

The skull drill comprises a spherical drill bit, a drill rod and a joint body, the drill rod is connected between the spherical drill bit and the joint body, and the joint body is used for being in transmission connection with a driving device; wherein the spherical drill bit comprises a sphere part and a plurality of blade parts, the blade parts are sequentially arranged on the periphery of the sphere part in the circumferential direction of the drill rod, and the blade parts extend in the axial direction of the drill rod; and in the extension direction of the blade part, the depth of the blade part is gradually increased and then gradually reduced. According to the skull drill, the slippage risk is effectively reduced in the using process, so that the skull drill has high stability, and the consistency of the tapping angle and the preset angle is facilitated. In this way, in the SEEG operation, the angle precision of the implantation path of the guide screw can be high, and then the best treatment effect can be achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a skull drill. BACKGROUND

[0002] In recent years, the global incidence of epilepsy is about 0.5% to 1%, and about 30% of patients are considered to be intractable epilepsy. According to statistics, about one-third of patients with epilepsy are ineffective for drug treatment and need to consider surgical intervention. As an important surgical evaluation method, stereoelectroencephalography (SEEG) can provide high-resolution electroencephalogram information to help accurately locate the epileptic focus and guide surgical treatment decisions. However, the implantation accuracy of SEEG electrodes is crucial to the evaluation results. Precise electrode positioning not only improves the accuracy of preoperative evaluation, but also effectively reduces the risk of complications such as bleeding. Therefore, in the diagnosis and treatment of epilepsy, ensuring the accuracy of SEEG implantation is an important prerequisite for achieving the best treatment effect.

[0003] During SEEG surgery, a guide screw needs to be implanted with the help of a skull drill to guide the implantation of deep brain electrodes. The implantation accuracy of the guide screw determines the implantation accuracy of the deep brain electrodes. The angle of the implantation path is one of the factors that affect the accuracy of the guide screw, so in some cases, the skull drill needs to drill a hole at an angle to the surface of the skull.

[0004] The surface of the skull is a spherical curved surface. When the skull drill drills a hole at an angle to the surface of the skull, there is a risk of slippage in the initial stage of drilling the hole. The slippage of the skull drill will also cause the angle of the hole drilled by the skull drill to deviate from the preset angle, which will also reduce the angle accuracy of the implantation path of the guide screw. CONTENT OF THE UTILITY MODEL

[0005] Therefore, it is necessary to provide a skull drill to solve the slippage problem of the skull drill.

[0006] A skull drill comprises a spherical drill bit, a drill rod, and a joint body, the drill rod is connected between the spherical drill bit and the joint body, and the joint body is used for transmission connection with a driving device;

[0007] The spherical drill bit comprises a spherical body and a plurality of blade portions, the plurality of blade portions are arranged in sequence at the outer periphery of the spherical body in the circumferential direction of the drill rod, and the blade portions extend in the axial direction of the drill rod;

[0008] In the extension direction of the blade portion, the depth of the blade portion gradually increases and then gradually decreases.

[0009] In one embodiment, the drill rod comprises a first rod body and a second rod body, the first rod body is connected between the spherical drill bit and the second rod body;

[0010] The cross-sectional dimension of the first rod body is smaller than the cross-sectional dimension of the second rod body.

[0011] In one embodiment, the first rod body comprises a first rod body part and a second rod body part, and the second rod body part is connected between the first rod body part and the second rod body.

[0012] In the axial direction of the drill rod, the end faces of the two ends of the first rod body part are respectively a first end face and a second end face, the first end face is connected with the spherical drill bit, the second end face is connected with the second rod body part, and in the direction from the first end face to the second end face, the cross-sectional dimension of the first rod body gradually increases.

[0013] In one embodiment, the end face of the second rod body part is a third end face, and the second end face is the same as the third end face.

[0014] In one embodiment, in the axial direction of the skull drill, the orthographic projection plane of the first end face is located in the orthographic projection plane of the spherical body part.

[0015] In one embodiment, the drill rod is used to be rotatably arranged in the positioning sleeve, wherein the second rod body is located in the positioning sleeve, and the structure of the second rod body is a cylinder, a cylindrical through hole is arranged in the positioning sleeve, the circumference of the second rod body is Q mm, and the relationship Q≤0.005 is satisfied.

[0016] In one embodiment, the drill rod is used to be rotatably arranged in the positioning sleeve, so that the spherical drill bit and the engaging body are located on the two sides of the positioning sleeve in the axial direction of the positioning sleeve, and the end face of the engaging body facing the spherical drill bit is adapted to abut against the positioning sleeve for limiting.

[0017] In one embodiment, the engaging body comprises an engaging body and a bearing part, and the bearing part is assembled on the side of the engaging body facing the drill rod in the axial direction of the skull drill.

[0018] The bearing part comprises a first bearing ring and a second bearing ring which can rotate relative to each other, the first bearing ring is fixedly assembled on the engaging body, and the end face of the second bearing ring facing the side of the drill rod is adapted to abut against the positioning sleeve.

[0019] In one embodiment, the engaging body is provided with an engaging part on the side away from the spherical drill bit in the axial direction of the skull drill, and the engaging part is adapted to be connected with the output part of the driving device.

[0020] In one embodiment, the spherical drill bit and the drill rod are integrally formed;

[0021] Alternatively, the drill rod and the engaging body are integrally formed;

[0022] Alternatively, the spherical drill bit, the drill rod and the engaging body are integrally formed.

[0023] The skull drill effectively reduces the risk of slippage during use, so that the skull drill has higher stability, which is conducive to the consistency of the hole angle with the preset angle. In this way, the angle accuracy of the implantation path of the guide screw can be high in the SEEG operation, thereby facilitating the realization of the best treatment effect. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a perspective view of a skull drill according to an embodiment of the present application.

[0025] Figure 2 It is another perspective view of a skull drill according to an embodiment of the present application.

[0026] Figure 3 It is a structural schematic view of a spherical drill bit according to an embodiment of the present application.

[0027] Figure 4 It is a structural schematic view of a joint body according to an embodiment of the present application.

[0028] REFERENCE NUMERALS:

[0029] 100, skull drill; 1, spherical drill bit; 11, blade part; 2, drill rod; 21, first rod body; 211, first rod body part; 212, second rod body part; 22, second rod body; 3, joint body; 31, joint body; 310, joint part. DETAILED DESCRIPTION

[0030] In order to make the above objectives, characteristics and advantages of the present application more apparent and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, a lot of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0031] In the description of the present application, it should be understood that if these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0032] In addition, the terms "first", "second", and the like, if any, are used herein for descriptive purposes only and should not be construed as indicating or implying relative importance or implicating the number of indicated technical features. Thus, a feature defined with "first" or "second" can include at least one of the features explicitly or implicitly. In the description of the present application, the term "plurality" means at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0033] In the present application, unless otherwise explicitly specified and limited, if the terms "mounting", "connecting", "connecting", "fixing" and the like appear, these terms should be interpreted broadly. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] In the present application, unless otherwise explicitly specified and limited, if the first feature is described as "on" or "under" the second feature, etc., it can mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be the first feature directly above or obliquely above the second feature, or it can only mean that the first feature is higher than the second feature in horizontal height. The first feature "below", "below" and "below" the second feature can be the first feature directly below or obliquely below the second feature, or it can only mean that the first feature is lower than the second feature in horizontal height.

[0035] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on another element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are only for illustrative purposes and do not represent the only implementation.

[0036] Reference Figures 1 to 4As shown, the skull drill 100 according to some embodiments of the present application comprises a spherical drill head 1, a drill rod 2 connected between the spherical drill head 1 and a coupling body 3, and the coupling body 3 is used to be drivingly connected with a driving device, so that the driving device can be used to drive the skull drill 100 to rotate around its axis, and then the spherical drill head 1 can be used to drill a hole in the skull. It should be noted that the hole drilled by the spherical drill head 1 in the skull can be a through hole or a counterbore.

[0037] The spherical drill head 1 comprises a spherical body and a plurality of blade portions 11, the plurality of blade portions 11 are arranged in sequence on the outer periphery of the spherical body along the circumferential direction of the drill rod 2, and the blade portions 11 extend along the axial direction of the drill rod 2, and in the extending direction of the blade portions 11, the depth of the blade portions 11 gradually increases and then gradually decreases.

[0038] For example, in some embodiments of the present application, the skull drill 100 is used to drill a hole in the skull. Since the overall shape of the spherical drill head 1 of the skull drill 100 according to the present application is spherical, the contact area between the spherical drill head 1 and the skull is the same in the case that the skull drill 100 contacts the surface of the skull at different inclination angles. The plurality of blade portions 11 are arranged in sequence and uniformly on the outer periphery of the spherical body along the circumferential direction of the drill rod 2, and the blade portions 11 extend along the axial direction of the drill rod 2, so that the hole drilled by the skull drill 100 does not have the problem of slippage caused by the sharp point effect of the conventional skull drill in the initial stage of drilling. It should be understood that the sharp point effect of the conventional skull drill refers to the fact that the tip portion of the conventional skull drill will produce some special phenomena during drilling. Due to the stress concentration at the sharp point of the conventional skull drill, the material removal rate is relatively high. When the conventional skull drill drills a hole in the skull, the tip portion of the conventional skull drill first cuts into the material. Due to the sharp point effect, the cutting force of the tip portion of the conventional skull drill in the direction perpendicular to the axis will produce a component force. For example, if the cutting force of the drill head is decomposed into an axial force (in the direction along the axis of the drill head, used to make the drill head advance) and a radial force (perpendicular to the axis), the strong cutting action at the sharp point will cause the radial force to be distributed unevenly, resulting in a force that deviates the original rotation center of the drill head.

[0039] In addition, referring to Figures 1 to 3 As shown, since the blade portions 11 extend helically along the axial direction of the drill rod 2, and the depth of the blade portions 11 gradually increases and then gradually decreases in the extending direction of the blade portions 11, this is conducive to chip removal during drilling operation. The chips are smoothly discharged along the chip removal groove defined by the adjacent two blade portions 11, preventing the chips from being blocked in the hole, and ensuring the smoothness of the drilling process.

[0040] Therefore, the skull drill 100 according to this application effectively reduces the risk of slippage, making the skull drill 100 highly stable, which is beneficial for the consistency of the opening angle with the preset angle. This allows for high angular accuracy of the guide screw implantation path during SEEG surgery, thereby contributing to optimal treatment results.

[0041] In some embodiments of this application, the diameter of the spherical drill bit 1 is R mm, which satisfies the relationship: 1.5≤R≤3.0, and the arc range of the cutting edge 11 of the spherical drill bit 1 is θ°, which satisfies the relationship: 20≤θ≤30. In addition, the maximum depth of the cutting edge 11 is H mm, which satisfies the relationship: 0.1≤R≤0.2.

[0042] In some embodiments, the skull drill 100 of this application can be used to drill a through hole in the skull, or the skull drill 100 of this application can be used to drill a countersunk hole in the skull, and then a conventional skull drill can be used to drill a through hole. It should be further noted that, in the method of first using the skull drill 100 of this application and then using a conventional skull drill, since the bottom surface of the countersunk hole drilled by the skull drill 100 of this application is a concave pit, the conventional skull drill can also avoid the occurrence of a cusp effect during the secondary drilling process, allowing the conventional skull drill to penetrate the skull at a preset angle.

[0043] It should be noted that in some embodiments of this application, the skull drill 100 is used to drill holes in the skull, but this application is not limited to this, and the skull drill 100 can also be applied to other application scenarios.

[0044] See Figure 1 and Figure 2 As shown, in some embodiments of this application, the skull drill 100 can be assembled in the positioning sleeve of a positioning device (not shown in the figure). When the skull drill 100 is assembled in the positioning sleeve, it passes through the positioning sleeve and is rotatable relative to the positioning sleeve. When the skull drill 100 is assembled in the positioning sleeve, the drill rod 2 is located within the through hole formed by the positioning sleeve, and the drill rod 2 is rotatably inserted through the positioning sleeve. Thus, in the axial direction of the positioning sleeve, the spherical drill bit 1 and the coupling body 3 are located on opposite sides of the positioning sleeve. Since the drill rod 2 passes through the positioning sleeve, the skull drill 100 is also limited in the radial direction by the positioning sleeve. Furthermore, along the axial direction of the skull drill 100, the end face of the coupling body 3 facing the spherical drill bit 1 is adapted to abut against and limit the positioning sleeve. Thus, in the axial direction of the skull drill 100, the skull drill 100 is limited in the positioning sleeve. Therefore, the skull drill 100 according to this application is suitable for a positioning device for positioning it, so as to further improve the stability of the skull drill 100 during use.

[0045] In some embodiments, since the engaging body 3 is adapted to abut against the positioning sleeve in the axial direction of the skull drill 100, when the spherical drill bit 1 is in contact with the surface of the skull during the drilling operation of the skull drill 100 in the skull, the engaging body 3 is spaced apart from the positioning sleeve, so that when the engaging body 3 abuts against the positioning sleeve, the skull drill 100 cannot be further moved in its axial direction, achieving the effect of controlling the opening depth of the skull drill 100. Thus, the skull drill 100 according to the present application can also achieve the effect of controlling the opening depth by cooperating with the positioning sleeve, so that the actual hole depth conforms to the preset hole depth. Since the skull drill 100 according to the present application can control the opening depth, it can prevent the dura mater and brain tissue inside the skull from being damaged due to over-drilling, thereby improving the operation safety.

[0046] Referring to FIGS. 1 and 2, Figure 1 and Figure 2 In some embodiments of the present application, the drill rod 2 includes a first rod body 21 and a second rod body 22, and the first rod body 21 is connected between the spherical drill bit 1 and the second rod body 22. The cross-sectional dimension of the first rod body 21 is smaller than that of the second rod body 22. Since the engaging body 3 is used for transmission connection with the driving device, the driving force applied by the driving device to the engaging body 3 is transmitted along the second rod body 22, the first rod body 21, and the spherical drill bit 1 in sequence. Thus, since the cross-sectional dimension of the first rod body 21 is larger than that of the second rod body 22, the rigidity of the second rod body 22 is higher than that of the first rod body 21, so as to facilitate reducing the risk of shaking of the spherical drill bit 1 during rotation of the skull drill 100.

[0047] In some embodiments of the present application, when the skull drill 100 is assembled in the positioning sleeve, the second rod body 22 is located in the through hole of the positioning sleeve, and the structure of the second rod body 22 is a cylinder, and the through hole in the positioning sleeve is also a cylinder, so that the second rod body 22 is adapted to be penetrated in the positioning sleeve, and the second rod body 22 can rotate relative to the positioning sleeve, so as to achieve that the skull drill 100 is rotatably assembled in the positioning sleeve. Moreover, the circumference of the second rod body 22 is Q mm (millimeter), and the relationship Q≤0.005 is satisfied. Thus, during rotation of the skull drill 100, since the circumference of the second rod body 22 is small, the skull drill 100 can rotate more stably at high speed, which facilitates reducing the risk of shaking of the spherical drill bit 1, and reduces the energy loss and component wear caused by vibration.

[0048] Referring to FIGS. 1 and 2, Figure 1 and Figure 2As shown, in some embodiments of this application, the first rod 21 includes a first rod portion 211 and a second rod portion 212, with the second rod portion 212 connected between the first rod portion 211 and the second rod portion 212. Along the axial direction of the drill rod 2, the end faces at both ends of the first rod portion 211 are a first end face (not shown in the figure) and a second end face (not shown in the figure), respectively. The first end face is connected to the spherical drill bit 1, and the second end face is connected to the second rod portion 212. Furthermore, the cross-sectional dimension of the first rod 21 gradually increases from the first end face to the second end face. This reduces the moment of inertia at the first end face during the rotation of the skull drill 100, thereby further reducing the risk of vibration in the spherical drill bit 1. It should be understood that the farther the mass distribution is from the axis of rotation, the greater the moment of inertia. Therefore, since the cross-sectional dimensions of the first rod 211 gradually increase from the first end face to the second end face, the moment of inertia at the first end face is minimized, thus reducing the risk of vibration of the spherical drill bit 1. At the same time, the cross-sectional dimensions of the portion of the first rod 211 closer to the second end face are larger, which also ensures the rigidity of the first rod 211.

[0049] See Figure 1 and Figure 2 As shown, in some embodiments of this application, the end faces of the second rod portion 212 and the first rod portion 211 are third end faces (not shown in the figure). The second end face and the third end face are identical, which can be understood as the second end face and the third end face having the same shape and equal size. This gives the first rod 21 and the second rod 22 a higher connection strength. In addition, this provides a better transition of force between the first rod 21 and the second rod 22, reducing the risk of vibration at the first end face, thereby further reducing the risk of vibration in the spherical drill bit 1.

[0050] See Figure 1 and Figure 2 As shown, in some embodiments of this application, the orthographic projection plane of the first end face is located within the orthographic projection plane of the spherical portion along the axial direction of the skull drill 100. This can also be understood as the orthographic projection plane of the first end face completely coinciding with the orthographic projection plane of the spherical portion, or the orthographic projection plane of the first end face being smaller than the orthographic projection plane of the spherical portion. This makes the size of the first end face smaller than the maximum cross-sectional size of the spherical portion, thus helping to avoid interference between the drill rod 2 and the skull when the skull drill 100 is drilling at a large angle.

[0051] See Figure 1 and Figure 2As shown, in some embodiments of the present application, the cross-sectional dimension of the first rod body 21 is smaller than that of the second rod body 22, and the cross-sectional dimension of the first rod body 21 gradually increases from the first end face to the second end face, and the orthographic projection of the first end face is located in the orthographic projection of the spherical body portion in the axial direction of the skull drill 100. In this way, when the operator uses the skull drill 100 to perform drilling, the first rod body 21 does not block the line of sight when the operator observes the spherical drill bit 1, so that the operator can easily observe the spherical drill bit 1. In addition, since the diameter of the spherical drill bit 1 is known, the operator can also determine the size of the drilled hole depth by observing the position of the spherical drill bit 1 during the drilling operation of the operator using the skull drill 100, which is beneficial to reduce the situation of drilling too deep.

[0052] Referring to Figure 1 As shown, in some embodiments of the present application, the engaging body 3 includes an engaging body 31 and a bearing (not shown in the figure), and the bearing is assembled on the side of the engaging body 3 facing the drill rod 2 in the axial direction of the skull drill 100. The bearing includes a first bearing ring and a second bearing ring that can rotate relative to each other, the first bearing ring is fixedly assembled on the engaging body 31, and the second bearing ring is adapted to abut against the positioning sleeve on the side of the end face facing the drill rod 2. When the engaging body 3 abuts against the positioning sleeve, since the second bearing ring abuts against the positioning sleeve and the first bearing ring is fixedly assembled on the engaging body 31, the resistance generated by the positioning sleeve on the skull drill 100 is reduced, the rotation speed of the skull drill 100 is ensured, and at the same time, the shaking of the skull drill 100 during rotation can also be avoided.

[0053] Referring to Figure 2 As shown, in some embodiments of the present application, the engaging body 3 is provided with an engaging portion 310 away from the spherical drill bit 1 in the axial direction of the skull drill 100, and the engaging portion 310 is adapted to be connected with the output portion of the driving device, so that the skull drill is driven to rotate by the driving device. In some embodiments, one of the engaging portion 310 and the output portion is a plug-in groove, and the other is a plug-in protrusion. It can also be understood that when the engaging portion 310 is a plug-in groove, the output portion is a plug-in protrusion, or when the engaging portion 310 is a plug-in protrusion, the output portion is a plug-in groove. For example, referring to Figures 3 to 4 As shown, in some embodiments of the present application, the engaging portion 310 is a plug-in groove, and the cross-sectional shape of the plug-in groove is hexagonal, and correspondingly, the output portion is a plug-in protrusion with a hexagonal cross-sectional shape, so that the output portion is adapted to be connected with the engaging portion 310. In this way, the plug-in protrusion and the plug-in groove are plugged and connected, so that the engaging portion 310 is connected with the output portion of the driving device, and the driving device drives the skull drill to rotate.

[0054] In some embodiments of the present application, referring toFigure 4 Figure 4 Figure 1 As shown, the spherical drill bit is integrally formed with the drill rod, so as to ensure the connection strength of the spherical drill bit and the drill rod. Alternatively, the drill rod is integrally formed with the joint body 3, so as to ensure the connection strength of the drill rod and the joint body 3. Alternatively, the spherical drill bit, the drill rod and the joint body 3 are integrally formed, which can also be understood as the craniopunch is integrally formed, so that the spherical drill bit and the drill rod, and the drill rod and the joint body 3 have high connection strength. In an embodiment of the present application, the spherical drill bit, the drill rod and the joint body 3 are integrally formed, so that the craniopunch has high structural strength, and the coaxiality of the spherical drill bit, the drill rod and the joint body 3 can be effectively ensured, so as to further improve the stability of the spherical drill bit.

[0055] The technical features of the above embodiments can be combined in any manner. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present application.

[0056] The above embodiments only express several implementation manners of the present application, and the description is specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be pointed out that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A skull drill, characterized in that The application relates to a skull drill, comprising: a spherical drill head, a drill rod connected between the spherical drill head and a joint body, and the joint body being used for transmission connection with a driving device; wherein the spherical drill head comprises a spherical body and a plurality of blade parts, the blade parts are sequentially arranged on the outer periphery of the spherical body in the circumferential direction of the drill rod, and the blade parts extend in the axial direction of the drill rod; the depth of the blade part gradually increases and then gradually decreases in the extending direction of the blade part. The drill rod comprises a first rod body and a second rod body, the first rod body is connected between the spherical drill head and the second rod body; the cross-sectional dimension of the first rod body is smaller than that of the second rod body. The first rod body comprises a first rod body part and a second rod body part, the second rod body part is connected between the first rod body part and the second rod body; in the axial direction of the drill rod, the end faces of the two ends of the first rod body part are respectively a first end face and a second end face, the first end face is connected with the spherical drill head, the second end face is connected with the second rod body part, and in the direction from the first end face to the second end face, the cross-sectional dimension of the first rod body gradually increases. The second rod body part has a third end face which is the same as the second end face.

2. The cranial drill according to claim 1, characterized in that In the axial direction of the skull drill, the normal projection plane of the first end face is located in the normal projection plane of the spherical body. The drill rod is used for being rotatably arranged in a positioning sleeve, the second rod body is located in the positioning sleeve, the second rod body has a cylindrical structure, a cylindrical through hole is arranged in the positioning sleeve, the circumferential degree of the second rod body is Q mm, and the relationship Q<=0.005 is met.

3. The cranial drill according to claim 2, wherein, The drill rod is used for being rotatably arranged in a positioning sleeve, the spherical drill head and the joint body are respectively located on the two sides of the positioning sleeve in the axial direction of the positioning sleeve, and the end face of the joint body towards the spherical drill head is adapted to abut against the positioning sleeve for limiting. The joint body comprises a joint body and a bearing part, the bearing part is assembled on the side of the joint body towards the drill rod in the axial direction of the skull drill.

4. The cranial drill according to claim 3, wherein, The bearing part comprises a first bearing ring and a second bearing ring which can relatively rotate, the first bearing ring is fixedly assembled on the joint body, and the end face of the second bearing ring towards the side of the drill rod is adapted to abut against the positioning sleeve.

5. The cranial drill according to claim 4, characterized in that The joint body is provided with a joint part away from the spherical drill head in the axial direction of the skull drill, and the joint part is adapted to be matched with the output part of the driving device.

6. The cranial drill according to claim 2, wherein, The spherical drill head and the drill rod are integrally formed; or the drill rod and the joint body are integrally formed; or the spherical drill head, the drill rod and the joint body are integrally formed.

7. The cranial drill according to any one of claims 1 to 6, characterized in that, ​ 8. The cranial drill according to claim 7, characterized in that ​ ​ 9. The cranial drill according to any one of claims 1 to 6, characterized in that, ​ 10. The cranial drill according to any one of claims 1 to 6, characterized in that, ​ ​ ​

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