CN211723328U

CN211723328U - Skull drill device

Info

Publication number: CN211723328U
Application number: CN201920980673.6U
Authority: CN
Inventors: 郭毅军; 杨雨烟; 杨永波
Original assignee: Chongqing Xishan Science and Technology Co Ltd
Current assignee: Chongqing Xishan Science and Technology Co Ltd
Priority date: 2019-06-27
Filing date: 2019-06-27
Publication date: 2020-10-23
Anticipated expiration: 2029-06-27

Abstract

The utility model relates to a skull drill device, which comprises a handle body, a handle outer cover, a power shaft and a drill bit. The handle body is provided with a first shaft hole. The handle outer cover is in sleeve joint fit with the handle body, and the handle outer cover is provided with a second shaft hole communicated with the first shaft hole. The power shaft is rotationally arranged in the first shaft hole and the second shaft hole, one end of the power shaft is used for being connected with an output rotating shaft of the motor, and the other end of the power shaft is connected with the drill bit. Foretell skull drill device during operation, drill bit and handle dustcoat synchronous contact skull, the output pivot of motor links to each other with the driving shaft and drives the driving shaft and rotate, and the driving shaft drives the drill bit and rotates, and the drill bit rotates the in-process and bores the skull gradually, plays supporting role when the handle dustcoat is contradicted the skull, can avoid the skull drill device to continue to remove to the skull after the drill bit bores the skull. Compared with the traditional skull drilling device, only one drill bit is adopted for drilling, so that an outer drill bit is omitted, the structure is simplified, and the cost is reduced.

Description

Skull drill device

Technical Field

The utility model relates to the technical field of medical equipment, especially relate to a skull bores device.

Background

Cranial drill devices are used to drill the skull during neurosurgery. A cranial drill device generally includes an outer housing, an outer drill bit disposed within the outer housing, an inner drill bit disposed within the outer drill bit, and a drive shaft for driving the inner drill bit and the outer drill bit to rotate. However, since the conventional skull drilling device includes the inner drill bit and the outer drill bit, the inner drill bit and the outer drill bit are required to jointly perform the drilling operation, the structure is complex, and the cost is high.

SUMMERY OF THE UTILITY MODEL

In view of the foregoing, there is a need to overcome the deficiencies of the prior art and to provide a cranial drill device that simplifies the structure and reduces the cost of the device.

The technical scheme is as follows: a cranial drill device, comprising: the handle comprises a handle body and a handle cover, wherein the handle body is provided with a first shaft hole; handle dustcoat, power shaft and drill bit, the handle dustcoat with the handle body cup joints the cooperation, the handle dustcoat be equipped with the second shaft hole that the first shaft hole communicates, the power shaft rotationally set up in the first shaft hole with in the second shaft hole, power shaft one end is used for linking to each other with the output pivot of motor, the other end of power shaft with the drill bit links to each other.

Foretell skull drill device during operation, drill bit and handle dustcoat synchronous contact skull, the output pivot of motor links to each other with the driving shaft and drives the driving shaft and rotate, and the driving shaft drives the drill bit and rotates, and the drill bit rotates the in-process and bores the skull gradually, plays supporting role when the handle dustcoat is contradicted the skull, can avoid the skull drill device to continue to remove to the skull after the drill bit bores the skull. Compared with the traditional skull drilling device, only one drill bit is adopted for drilling, so that an outer drill bit is omitted, the structure is simplified, and the cost is reduced.

In one embodiment, the power shaft includes a first driving shaft and a second driving shaft, the first driving shaft is rotatably disposed in the first shaft hole, the second driving shaft is rotatably disposed in the second shaft hole, one end of the first driving shaft is used for connecting with the output rotating shaft of the motor, the other end of the first driving shaft is in clutch fit with one end of the second driving shaft, and the other end of the second driving shaft is used for connecting with the drill bit.

In one embodiment, an end face of the first driving shaft facing the second driving shaft extends inwards along the axial direction to form a movable hole, a first elastic piece is arranged in the movable hole, and a plug inserted into the movable hole is arranged at one end of the second driving shaft facing the first driving shaft; or, a movable hole extends inwards along the axial direction from the end face of one end, facing the first driving shaft, of the second driving shaft, a first elastic piece is arranged in the movable hole, and a plug inserted into the movable hole is arranged at one end, facing the second driving shaft, of the first driving shaft.

In one embodiment, the end surface of the first driving shaft facing the second driving shaft is further provided with a concave part, and the end of the second driving shaft facing the first driving shaft is further provided with an insertion block matched with the concave part; or, a concave part is further arranged on the end face of one end, facing the first driving shaft, of the second driving shaft, and an insertion block matched with the concave part is further arranged on one end, facing the second driving shaft, of the first driving shaft.

In one embodiment, a linkage sleeve is fixedly sleeved on the second driving shaft, a limiting sleeve is rotatably sleeved outside the linkage sleeve, and the limiting sleeve is in magnetic attraction fit with the linkage sleeve; the outer side wall of the limiting sleeve is provided with first threads, the inner side wall of the second shaft hole is provided with second threads matched with the first threads, and the limiting sleeve is sleeved in the second shaft hole.

In one embodiment, the second driving shaft is movably sleeved with a limiting bearing, the second driving shaft is further provided with a first clamping ring and a second elastic piece, the second elastic piece is arranged between the first clamping ring and the limiting bearing, and the end face of the limiting bearing is used for being in interference fit with the end face of the limiting sleeve.

In one embodiment, the second elastic member is a spring; the second driving shaft is further provided with a flange which is used for being in interference fit with the limiting bearing, and the flange is located between the first clamping ring and the limiting bearing.

In one embodiment, a cutter mounting seat is arranged at one end of the second driving shaft far away from the first driving shaft, and the drill bit is detachably arranged on the cutter mounting seat.

In one embodiment, the side wall of the end of the handle housing for contacting with the skull bone is provided with a notch for exposing the cutter mounting seat.

In one embodiment, a groove is formed in the inner side wall of the handle outer cover, a limiting block is arranged on the outer side wall of the handle body of the handle, and the limiting block is arranged in the groove and can move along the bottom wall of the groove; the handle body is provided with a hand-held handle; a first bearing is arranged in the first shaft hole, and the first driving shaft is rotatably arranged in the first bearing; and a second bearing is arranged in the second shaft hole, and the second driving shaft is rotatably arranged in the second bearing.

Drawings

Fig. 1 is a schematic axial cross-sectional structural view of a cranial drill device according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a cranial drill device according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a cranial drill device according to an embodiment of the present invention;

fig. 4 is a schematic view illustrating a first state of the skull drill device for drilling the skull according to an embodiment of the present invention;

fig. 5 is a schematic view illustrating a second state of the skull drill device for drilling the skull according to an embodiment of the present invention;

fig. 6 is a schematic view illustrating a third state of drilling the skull by the skull drill device according to the embodiment of the present invention;

fig. 7 is a schematic view illustrating a fourth state of the skull drilling device according to an embodiment of the present invention;

fig. 8 is a schematic structural view of a second driving shaft of a cranial drill device according to an embodiment of the present invention;

fig. 9 is a schematic structural view of a first driving shaft of a cranial drill device according to an embodiment of the present invention;

fig. 10 is a schematic structural view illustrating a combination of a first driving shaft and a second driving shaft of a cranial drill device according to an embodiment of the present invention;

fig. 11 is a schematic structural view of a cranial drill device according to an embodiment of the present invention, in which a first driving shaft is separated from a second driving shaft;

fig. 12 is a schematic view of a second driving shaft of a cranial drill device according to an embodiment of the present invention;

fig. 13 is a schematic structural view of a handle housing of a cranial drill device according to an embodiment of the present invention;

fig. 14 is a schematic structural view of a stop collar of a cranial drill device according to an embodiment of the present invention.

Reference numerals:

10. the handle comprises a handle body, 11, a first shaft hole, 12, a limiting block, 13, a handheld handle, 14, a first bearing, 20, a handle outer cover, 21, a second shaft hole, 22, a second thread, 23, a notch, 24, a groove, 25, a second bearing, 31, a first driving shaft, 311, a movable hole, 312, a concave part, 32, a second driving shaft, 321, a plug, 322, an insertion block, 323, a flange, 40, a drill bit, 50, a first elastic piece, 60, a linkage sleeve, 61, a first magnet, 70, a limiting sleeve, 71, a first thread, 72, a second magnet, 81, a limiting bearing, 82, a first clamping ring, 83, a second elastic piece, 84, a second clamping ring, 85, a third clamping ring, 86, a third elastic piece, 90, a cutter mounting seat, 100 and a skull bone.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

In the description of the present invention, it is to be understood that the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the description of the present invention, it is to be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly connected" to another element, there are no intervening elements present.

In the description of the present invention, "drilling" means drilling at any time during the drilling process.

In one embodiment, referring to fig. 1-3, a cranial drill device includes a handle body 10, a handle housing 20, a power shaft (31, 32) and a drill bit 40. The handle body 10 is provided with a first shaft hole 11. The handle outer cover 20 is matched with the handle body 10 in a sleeved mode, and the handle outer cover 20 is provided with a second shaft hole 21 communicated with the first shaft hole 11. The power shaft is rotatably arranged in the first shaft hole 11 and the second shaft hole 21, one end of the power shaft is used for being connected with an output rotating shaft of a motor, and the other end of the power shaft is connected with the drill bit 40.

Referring to fig. 4 to 7, when the skull drilling device works, the drill bit 40 and the handle housing 20 synchronously contact the skull 100, the output rotating shaft of the motor is connected with the power shaft to drive the power shaft to rotate, the power shaft drives the drill bit 40 to rotate, the skull 100 is gradually drilled through during the rotation of the drill bit 40, the handle housing 20 plays a supporting role when abutting against the skull 100, and the skull drilling device can be prevented from continuously moving into the skull 100 after the drill bit 40 drills through the skull 100. Compared with the traditional skull drilling device, only one drill bit 40 is adopted for drilling, the outer drill bit 40 is omitted, the structure is simplified, and the cost is reduced.

In one embodiment, the power shaft includes a first drive shaft 31 and a second drive shaft 32. The first drive shaft 31 is rotatably disposed in the first shaft hole 11, and the second drive shaft 32 is rotatably disposed in the second shaft hole 21. One end of the first driving shaft 31 is used for being connected with an output rotating shaft of the motor, the other end of the first driving shaft 31 is in clutch fit with one end of the second driving shaft 32, and the other end of the second driving shaft 32 is used for being connected with the drill bit 40. In this way, during the drilling process of the drill bit 40 through the skull 100, the first driving shaft 31 is always combined with the second driving shaft 32, so that the drill bit 40 on the end part of the second driving shaft 32 can be always driven to rotate for drilling operation; when the drill bit 40 drills through the skull 100, the second drive shaft 32 is separated from the first drive shaft 31, the first drive shaft 31 can not drive the second drive shaft 32 to rotate any more, and the drill bit 40 stops drilling.

Further, a movable hole 311 extends inwards along the axial direction from an end surface of the first driving shaft 31 facing the second driving shaft 32, a first elastic member 50 is arranged in the movable hole 311, and a plug 321 for inserting into the movable hole 311 is arranged at an end of the second driving shaft 32 facing the first driving shaft 31. Specifically, the first elastic member 50 is a spring or a silica gel block. Of course. Based on the above structure, the following structure (not shown) is easily conceivable by those skilled in the art: the end face of one end, facing the first driving shaft, of the second driving shaft extends inwards along the axial direction to form a movable hole, a first elastic piece is arranged in the movable hole, and a plug inserted into the movable hole is arranged at one end, facing the second driving shaft, of the first driving shaft. This structure also belongs to the utility model discloses a protection category.

Further, referring to fig. 1, 8 to 11, a concave portion 312 is further disposed on an end surface of the first driving shaft 31 facing the second driving shaft 32, and an insertion block 322 adapted to the concave portion 312 is further disposed on an end of the second driving shaft 32 facing the first driving shaft 31. The insertion block 322 may be a bolt installed on the second driving shaft 32. In this way, when the end of the second driving shaft 32 is coupled to the end of the first driving shaft 31, the plug 321 is inserted into the movable hole 311, and the insertion block 322 is inserted into the recess 312, so that the rotation of the first driving shaft 31 rotates the second driving shaft 32. After the drill 40 drills through the skull bone 100, the first elastic element 50 pushes the plug 321 out of the movable hole 311, the plug 322 correspondingly moves out of the recess 312, the end of the second driving shaft 32 is no longer engaged with the first driving shaft 31, i.e. the first driving shaft 31 does not drive the second driving shaft 32 to rotate for drilling, and at this time, the drill 40 stops drilling. Of course. Based on the above structure, the following structure (not shown) is easily conceivable by those skilled in the art: the end face of one end, facing the first driving shaft, of the second driving shaft is further provided with a concave portion, and the end, facing the second driving shaft, of the first driving shaft is further provided with an insertion block matched with the concave portion. This structure also belongs to the utility model discloses a protection category.

Alternatively, the end surface of the first driving shaft 31 facing the second driving shaft 32 is not provided with the recess 312, and the end of the second driving shaft 32 facing the first driving shaft 31 is not provided with the insertion block 322, but the movable hole 311 is provided with a non-circular hole, the cross section of which may be oval, square, polygonal, etc., the plug 321 is adapted to the movable hole 311, that is, when the plug 321 is inserted into the movable hole 311, the first driving shaft 31 rotates to drive the second driving shaft 32 to rotate, so as to ensure that the first driving shaft 31 is combined with the second driving shaft 32; when the plug 321 is separated from the movable hole 311 by the first elastic member 50 after the drill bit 40 is drilled through the skull bone 100, the second driving shaft 32 is separated from the first driving shaft 31.

Further, referring to fig. 1, 12 to 14, a linkage sleeve 60 is fixedly sleeved on the second driving shaft 32, a limiting sleeve 70 is rotatably sleeved outside the linkage sleeve 60, and the limiting sleeve 70 is magnetically engaged with the linkage sleeve 60. The outer side wall of the limiting sleeve 70 is provided with a first thread 71, the inner side wall of the second shaft hole 21 is provided with a second thread 22 matched with the first thread 71, and the limiting sleeve 70 is sleeved in the second shaft hole 21. Specifically, the linkage sleeve 60 is embedded or embedded with the first magnet 61, and the stop sleeve 70 is embedded or embedded with the second magnet 72 magnetically attracted and matched with the first magnet 61, so that the magnetic attraction and matching between the linkage sleeve 60 and the stop sleeve 70 is ensured. Therefore, in the rotation process of the second driving shaft 32, the linkage sleeve 60 drives the limiting sleeve 70 to rotate through magnetic force, the limiting sleeve 70 synchronously moves towards the direction of the drill bit 40 along the axial direction of the second shaft hole 21 in the rotation process, and after the skull 100 is drilled through, the second driving shaft 32 is separated from the first driving shaft 31, at the moment, the limiting sleeve 70 plays an axial limiting role in the end part of the handle body 10, the handle body 10 is prevented from moving towards the direction of the drill bit 40, and the first driving shaft 31 and the second driving shaft 32 can be prevented from being combined together again.

Further, the handle grip 10 is movably sleeved in the handle housing 20, and a gap is formed between the end of the handle grip 10 and the stop sleeve 70. The gap may be 1mm, 2mm or 3mm or other size. When the skull 100 is drilled, the second driving shaft 32 is separated from the first driving shaft 31, and the limiting sleeve 70 is used for abutting against the handle body 10 which moves forwards, axially limiting the end part of the handle body 10, preventing the handle body 10 from moving towards the drill bit 40, and preventing the first driving shaft 31 and the second driving shaft 32 from being combined together again.

Further, referring to fig. 1 and 12, a limit bearing 81 is movably sleeved on the second driving shaft 32, and a first collar 82 and a second elastic member 83 are further disposed on the second driving shaft 32. The second elastic element 83 is disposed between the first collar 82 and the limiting bearing 81, and the end surface of the limiting bearing 81 is used for being in interference fit with the end surface of the limiting sleeve 70. Thus, when the second driving shaft 32 drives the drill bit 40 to rotate and drill the skull 100, and the drill bit 40 drills in situ without advancing, the relative position of the second driving shaft 32 and the handle housing 20 in the axial direction is unchanged, at this time, the linkage sleeve 60 drives the stop collar 70 to rotate, the stop collar 70 continues to move towards the drill bit 40 when rotating, and when the stop collar 70 abuts against the end surface of the stop bearing 81, the stop bearing 81 can limit the stop collar 70 to rotate on the one hand, and can abut against the stop collar 70 on the other hand to prevent the stop collar 70 from continuing to move forward, so as to play a role in limiting the position of the stop collar 70 in the axial direction of the second shaft hole 21. After the drill bit 40 drills through the skull bone 100, the second driving shaft 32 is separated from the first driving shaft 31 under the elastic force of the first elastic element 50, the end part of the handle 10 is abutted against the limiting sleeve 70 when moving forwards, and the limiting sleeve 70 can correspondingly limit the handle 10 to move forwards continuously, so that the first driving shaft 31 and the second driving shaft 32 can be prevented from being combined again, and the bad phenomenon that the skull bone 100 drills through the second driving shaft 32 without stopping can be avoided. In addition, after the drill 40 drills through the skull bone 100, the second driving shaft 32 is separated from the first driving shaft 31 by the elastic force of the first elastic member 50, and the stop bearing 81 moves toward the stop collar 70 and abuts against the stop collar 70 by the elastic force of the second elastic member 83.

Further, referring to fig. 1, 4 to 7, the second elastic element 83 is a spring. In addition, a flange 323 for interference fit with the limit bearing 81 is further provided on the second driving shaft 32, and the flange 323 is located between the first collar 82 and the limit bearing 81. Thus, when the second driving shaft 32 drives the drill bit 40 to rotate and drill the skull 100, and the drill bit 40 drills in situ without advancing, the relative position of the second driving shaft 32 and the handle housing 20 in the axial direction is not changed, at this time, the linkage sleeve 60 drives the position-limiting sleeve 70 to rotate, the position-limiting sleeve 70 continues to move towards the drill bit 40 when rotating, and when the position-limiting sleeve 70 abuts against the end surface of the position-limiting bearing 81, the position-limiting bearing 81 is driven by the position-limiting sleeve 70 to move along the second driving shaft 32 and compress the second elastic element 83, the position-limiting bearing 81 abuts against the flange 323 after moving for a certain distance, and the flange 323 can limit the position of the position-limiting bearing 81, so as to limit the position-limiting sleeve 70. In addition, when the drill bit 40 is changed from the state of drilling in situ without advancing to the state of continuing advancing, the limiting bearing 81 moves forwards along with the second driving shaft 32 and releases the limiting sleeve 70, and the limiting sleeve 70 correspondingly moves forwards synchronously. Therefore, the limiting sleeve 70 and the second driving shaft 32 can synchronously move forwards, so that the skull bone 100 can be drilled through by the drill bit 40, after the second driving shaft 32 is separated from the first driving shaft 31 under the pushing action of the first elastic part 50, the limiting sleeve 70 can abut against the handle body 10 moving forwards to limit the handle body 10, the first driving shaft 31 is prevented from being combined with the second driving shaft 32 again, and the second driving shaft 32 is immediately stopped after the skull bone 100 is drilled through. Meanwhile, the unfavorable phenomenon that the limiting sleeve 70 is excessively moved forwards and cannot have the function of limiting the end part of the handle body 10 in a butting mode after the drill bit 40 drills through the skull 100 is avoided.

In one embodiment, referring to fig. 1, 4 to 7, when the cranial drill device is in the initial state, the drill bit 40 protrudes slightly outside the handle housing 20, specifically, the distance d1 that the drill bit 40 protrudes outside the second axial hole 21 of the handle housing 20 is 0.5mm to 2 mm. In addition, the flange 323 and the limit bearing 81 are spaced apart from each other, and the distance d2 between the flange 323 and the limit bearing 81 is specifically 0.5 to 2 mm. At this time, the first drive shaft 31 and the second drive shaft 32 are in a separated state. In addition, when the skull drill device works in the process of drilling the skull 100, the end surface of the handle body 10 and the limiting sleeve 70 are arranged at intervals, and the distance d3 between the handle body 10 and the limiting sleeve 70 is specifically 0.5 mm-2 mm. At this time, the first drive shaft 31 and the second drive shaft 32 are in a coupled state.

Further, referring to fig. 1 and 12, a cutter mounting seat 90 is disposed at an end of the second driving shaft 32 away from the first driving shaft 31, and the drill 40 is detachably mounted on the cutter mounting seat 90. Therefore, the drill bit 40 is disassembled, replaced and maintained on the cutter mounting seat 90, the drill bit 40 can be conveniently disassembled, replaced and maintained, and the operation is convenient.

Further, referring to fig. 1 to 3, the side wall of the end of the handle housing 20 for contacting the skull bone 100 is provided with a notch 23 exposing the cutter mounting seat 90. Therefore, the drill bit 40 is convenient to disassemble, assemble, replace and maintain, and the operation is convenient.

In one embodiment, referring to fig. 1, a groove 24 is formed on an inner side wall of the handle housing 20, a stop block 12 is formed on an outer side wall of the handle body 10, and the stop block 12 is disposed in the groove 24 and can move along a bottom wall of the groove 24.

In addition, the handle body 10 is provided with a hand grip 13, and the operation is convenient by holding the hand grip 13. In addition, a first bearing 14 is provided in the first shaft hole 11, and the first drive shaft 31 is rotatably provided in the first bearing 14. A second bearing 25 is provided in the second shaft hole 21, and the second drive shaft 32 is rotatably provided in the second bearing 25. The rotation effect of the first driving shaft 31 is stable under the supporting action of the first bearing 14. Similarly, the second driving shaft 32 is supported by the second bearing 25 to have a stable rotation effect.

Further, referring to fig. 1 and 12, the second driving shaft 32 is further provided with a second collar 84 and a third collar 85 disposed on both sides of the tool mounting seat 90. A third resilient member 86 is also provided on the second drive shaft 32. The second collar 84 abuts against one side of the tool mount 90, and the tool mount 90 is connected to the third collar 85 through the third elastic member 86. The third elastic member 86 is embodied as a spring.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A cranial drill device, comprising:

the handle comprises a handle body and a handle cover, wherein the handle body is provided with a first shaft hole;

handle dustcoat, power shaft and drill bit, the handle dustcoat with the handle body cup joints the cooperation, the handle dustcoat be equipped with the second shaft hole that the first shaft hole communicates, the power shaft rotationally set up in the first shaft hole with in the second shaft hole, power shaft one end is used for linking to each other with the output pivot of motor, the other end of power shaft with the drill bit links to each other.

2. A cranial drilling device according to claim 1, wherein the power shaft comprises a first drive shaft rotatably disposed in the first shaft bore and a second drive shaft rotatably disposed in the second shaft bore, the first drive shaft having one end for coupling to the output shaft of the motor, the other end of the first drive shaft being in clutching engagement with one end of the second drive shaft, the other end of the second drive shaft being for coupling to the drill bit.

3. A cranial drilling device according to claim 2, wherein the end face of the first drive shaft facing the second drive shaft has a movable hole extending inwardly in the axial direction, a first resilient member being provided in the movable hole, and a plug for insertion into the movable hole being provided at the end of the second drive shaft facing the first drive shaft; or, a movable hole extends inwards along the axial direction from the end face of one end, facing the first driving shaft, of the second driving shaft, a first elastic piece is arranged in the movable hole, and a plug inserted into the movable hole is arranged at one end, facing the second driving shaft, of the first driving shaft.

4. A cranial drilling device according to claim 3, wherein the end face of the first drive shaft facing the second drive shaft is further provided with a recess, and the end of the second drive shaft facing the first drive shaft is further provided with an insert adapted to the recess; or, a concave part is further arranged on the end face of one end, facing the first driving shaft, of the second driving shaft, and an insertion block matched with the concave part is further arranged on one end, facing the second driving shaft, of the first driving shaft.

5. A cranial drill device according to claim 2, wherein a linkage sleeve is fixedly sleeved on the second drive shaft, a stop sleeve is rotatably sleeved outside the linkage sleeve, and the stop sleeve is magnetically engaged with the linkage sleeve; the outer side wall of the limiting sleeve is provided with first threads, the inner side wall of the second shaft hole is provided with second threads matched with the first threads, and the limiting sleeve is sleeved in the second shaft hole.

6. A cranial drilling device according to claim 5, wherein a stop bearing is movably sleeved on the second drive shaft, a first collar and a second elastic member are further arranged on the second drive shaft, the second elastic member is arranged between the first collar and the stop bearing, and the end surface of the stop bearing is used for interference fit with the end surface of the stop sleeve.

7. A cranial drill device according to claim 6, wherein the second resilient member is a spring; the second driving shaft is further provided with a flange which is used for being in interference fit with the limiting bearing, and the flange is located between the first clamping ring and the limiting bearing.

8. A cranial drill device according to claim 2, wherein the end of the second drive shaft remote from the first drive shaft is provided with a cutter mounting seat on which the drill bit is removably mounted.

9. A cranial drilling device according to claim 8, wherein the side wall of the end of the handle housing intended to come into contact with the skull is provided with a notch exposing the cutter mount.

10. A cranial drill device according to any of claims 2 to 9, wherein the inner side wall of the handle housing is provided with a groove and the outer side wall of the handle body is provided with a stop block, the stop block being arranged in the groove and movable along the bottom wall of the groove; the handle body is provided with a hand-held handle; a first bearing is arranged in the first shaft hole, and the first driving shaft is rotatably arranged in the first bearing; and a second bearing is arranged in the second shaft hole, and the second driving shaft is rotatably arranged in the second bearing.