Medical skull drill

Abstract

The invention discloses a medical skull drill, which relates to the technical field of medical instruments and comprises a support frame, a guide connecting rod, a handheld frame, a driving mechanism and a drill rod, the support frame is movably sleeved on the guide connecting rod; the guide connecting rod is fixedly connected with the handheld frame; the driving mechanism comprises a driving motor and a drill rod motor; the drill rod is arranged in a through hole penetrating through the guide connecting rod and the handheld frame and is driven by a drill rod motor embedded in the handheld frame; a swing connecting rod mechanism is arranged on the supporting frame, a telescopic foot is installed on the swing connecting rod mechanism, the swing connecting rod mechanism is embedded in a sliding groove of the guide connecting rod mechanism, and the supporting frame is driven by a driving motor fixed to the handheld frame to drive the swing connecting rod mechanism to move, expand the telescopic foot and form a circular ring structure to expand skin and flesh in an operation area. The driving motor is synchronously started during drilling, the feeding depth of the drill bit can be accurately controlled, intracranial soft tissue of a patient is prevented from being damaged, a surgery application area is clear and clean in cooperation with flushing water injection on the device, and the success rate of a surgery is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of medical instruments, and more particularly to a medical skull drill. Background Art

[0002] The craniotomy drill is a medical device widely used in neurosurgery, mainly used for cutting and perforating the skull. When drilling a hole in the skull, the doctor needs to manually push and press the drill bit to make a delicate and precise hole in the skull above the lesion in the brain, so that the drill bit just penetrates the skull without touching other soft tissues in the skull.

[0003] In the existing technology, such as in the Chinese patent application number CN202011260352.2, a skull drill is disclosed, which uses a feed motor to realize the uniform movement of the drill bit to drill holes, and uses a synchronous telescopic frame that can be extended outward to stretch the skin and flesh around the surgical area to realize a single-person drilling operation. However, in this scheme, only the control of the drill bit feed is guaranteed. The synchronous telescopic frame structure in contact with the skull cannot provide stable support for the device. It is easy to affect the final operation accuracy due to force offset, drilling vibration and other factors, resulting in uncontrollable risks and affecting the success of the operation. In addition, when the arc-shaped push plate on the synchronous telescopic frame structure expands outward, it cannot effectively fit with the arc-shaped surface of the skull, affecting the effect of stretching the skin and flesh. Summary of the invention

[0004] In order to solve the above-mentioned technical problems, the present invention provides a medical skull drill, which can ensure that the support structure stably supports the skull drill as a whole while controlling the feeding of the drill bit, and can stretch and fix the skin and flesh around the surgical area during drilling with the skull drill.

[0005] The medical skull drill of the present invention comprises a supporting frame, a guide connecting rod, a hand-held frame, a driving mechanism and a drill rod.

[0006] The support frame is composed of an inner support frame and an outer support frame movable set, both of which are hollow cylinders, and are fixedly connected to a plurality of swing link mechanisms at the same end, and the swing link mechanisms of the inner support frame and the outer support frame are arranged alternately. Each set of swing link mechanisms is equipped with an arc-shaped telescopic foot, and all the telescopic feet are assembled to form a circular ring structure.

[0007] A plurality of slide grooves are evenly distributed on the cylindrical guide connecting rod, and the swing connecting rod mechanism is slidably embedded in the slide grooves. A drill rod hole is formed on the axis of the guide connecting rod.

[0008] The hand-held frame comprises a fixedly connected cylindrical handle and a hollow central rod, one end of the central rod is movably sleeved in the inner support frame and fixedly connected to the center of the guide connecting rod. The drill rod is movably installed in the inner hole of the central rod.

[0009] The driving mechanism includes a support driving motor and a drill rod motor. The support driving motor is fixedly arranged outside the handheld frame to drive the inner support frame and the outer support frame to slide along the center rod individually or synchronously. The drill rod motor is embedded in the handle, and the motor shaft is fixedly connected to one end of the drill rod.

[0010] As a further improvement of the present invention, each set of swing link mechanisms includes a sliding rod, a telescopic rod 1 and a telescopic rod 2. The sliding rod is embedded in the slide groove, one end of which is fixedly connected to the corresponding inner support frame or the outer support frame, and the other end is provided with a protrusion, and a notch parallel to the slide groove is opened in the center of the protrusion. The telescopic rod 1 and the telescopic rod 2 are of the same length, and both ends of the two are provided with cylindrical hinge shafts on both sides.

[0011] As a further improvement of the present invention, the telescopic foot includes an inner telescopic foot and an outer telescopic foot, both of which are arc-shaped and can be assembled into a partial ring. The inner telescopic foot and the outer telescopic foot are staggered and can be assembled with adjacent parts to form a partial ring. All partial rings can form a complete ring structure. A rectangular protrusion is formed on the inner side of the inner telescopic foot and the outer telescopic foot, and a notch perpendicular to the plane of the ring is opened in the center of the protrusion.

[0012] As a further improvement of the present invention, one end of a pair of telescopic rods 1 and 2 is respectively hinged to the slot on the sliding rod, and the other end is respectively hinged to the slot on the corresponding inner telescopic foot or outer telescopic foot to form a parallelogram linkage mechanism.

[0013] As a further improvement of the present invention, a vertical through slot is provided at the center of one end of the telescopic rod 1 hinged with the sliding rod, and a horizontal notch is provided at a position of the through slot away from the hinged end. One end of the telescopic rod 2 hinged with the telescopic foot can be rotated into the notch and overlapped with the telescopic rod 1 in a colinear manner.

[0014] As a further improvement of the present invention, it also includes a closing torsion spring, which is arranged at one end of the hinged connection between the telescopic rod 2 and the sliding rod. One end of the closing torsion spring is fixed to the telescopic rod 2, and the other end is fixed to the notch on the sliding rod. The telescopic rod 2 is driven by the torsional elastic force of the closing torsion spring, and has a movement tendency to rotate toward one side of the guide connecting rod and overlap with the telescopic rod 1 in a colinear manner.

[0015] As a further improvement of the present invention, when telescopic rod 2 and telescopic rod 1 are overlapped in a colinear manner, adjacent inner telescopic legs fit together to form a nearly circular ring structure, and the outer telescopic legs are located above the inner telescopic legs, corresponding one by one to the adjacent fitting positions of the inner telescopic legs.

[0016] As a further improvement of the present invention, the arc-shaped ends of the inner telescopic foot have an inclined trend of contracting inward from bottom to top, and the arc-shaped ends of the outer telescopic foot have an inclined trend of expanding outward from bottom to top. The inclination angles of the inner telescopic foot and the outer telescopic foot are consistent, so they can fit tightly.

[0017] As a further improvement of the present invention, a through hole is provided on the inner telescopic leg, the through hole leads from the outer side of the inner telescopic leg to the inner side, and a flushing and water injection pipe is connected to the outer through hole.

[0018] Compared with the prior art, the beneficial effect of the present invention is that the present invention positions and supports the direction and plane of the drill bit through the support frame, providing doctors with stable drilling grip conditions. Moreover, by electrically driving the movement of the inner and outer support frames, the drill bit can be fed in a controlled downward pressure to prevent the drill bit from extending too far and damaging the patient's intracranial tissue. In addition, the support legs on the support frame can be combined into a circular ring shape to support the skin and flesh at the surgical site, and the water injection and cleaning of the through holes can provide doctors with a clear and clean surgical field, reduce the difficulty of operation, and improve the stability and success rate of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the interior of the handle of the present invention when it is half cut; Figure 3 It is a schematic diagram of the support frame structure of the present invention; Figure 4 For the present invention Figure 3 The enlarged schematic diagram of point A in the middle; Figure 5 It is a schematic diagram of the guide connecting rod structure of the present invention; Figure 6 It is a structural schematic diagram of the handheld stand of the present invention; Figure 7 It is a structural schematic diagram of the sliding rod on the outer support frame of the present invention; Figure 8 It is a schematic structural diagram of the sliding rod on the inner support frame of the present invention; Fig. 9 It is a schematic diagram of the structure of the inner support frame and the outer support frame of the present invention when they are assembled together; Fig.10 It is a structural schematic diagram of the swing link mechanism of the present invention when it is connected to the outer telescopic foot; Fig.11 It is a schematic structural diagram of the swing link mechanism of the present invention when it is connected to the inner telescopic foot; Fig.12 It is a schematic diagram of the inner telescopic legs and the outer telescopic legs of the present invention when they are assembled into a circular ring-shaped support frame; Fig.13 It is a schematic diagram of the inner telescopic leg and the outer telescopic leg of the present invention when they are separated; Fig.14 It is a schematic diagram of the inner telescopic foot of the present invention after improvement and the addition of a water injection hole; Description of the numbers in the figure: 1. Support frame; 2. Guide connecting rod; 3. Hand-held frame; 4. Driving mechanism; 5. Drill rod; 101. Inner support frame; 102. Outer support frame; 103. Swing connecting rod mechanism; 1031. Sliding rod; 1032. Telescopic rod one; 1033. Telescopic rod two; 104. Telescopic foot; 1041. Inner telescopic foot; 1042. Outer telescopic foot; 105. Retracting torsion spring; 201. Slide groove; 202. Drill rod hole; 301. Handle; 302. Center rod; 401. Driving motor; 402. Drill rod motor. DETAILED DESCRIPTION

[0020] Specific embodiment 1: Please refer to the attached drawings, A medical skull drill comprises a support frame 1, a guide connecting rod 2, a handheld frame 3, a driving mechanism 4 and a drill rod 5.

[0021] The support frame 1 includes an inner support frame 101 and an outer support frame 102, both of which are cylindrical hollow sleeves, and both have axially arranged racks on the outer wall of the sleeves, which start from one end face and extend to the middle of the sleeve. The inner diameter of the sleeve of the outer support frame 102 is equal to the outer diameter of the sleeve of the inner support frame 101, and the sleeve is movably mounted on the outer side thereof. An axial through groove is opened on the sleeve wall opposite to the rack of the outer support frame 102, and the width of the rack of the inner support frame 101 matches the width of the through groove, and is embedded therein when mounted. The other end faces of the inner support frame 101 and the outer support frame 102 extend radially outward to form a circle of annular outer edges, and the outer diameters of the two are the same. The annular outer edges of the two are cross-distributed on the side away from the sleeve, and four sets of swing link mechanisms 103 are installed along the axial direction of the sleeve, and each set of swing link mechanisms 103 is installed with arc-shaped telescopic feet 104. After the inner support frame 101 and the outer support frame 102 are assembled, the swing link mechanisms 103 of the two are arranged in pairs and staggered to form a cross-shaped distribution. The annular outer edge of the inner support frame 101 is provided with four notches, which are arranged at intervals between two adjacent sets of swing link mechanisms 103 to allow the four sets of swing link mechanisms 103 of the outer support frame 102 to slide through.

[0022] The guide link 2 is a cylindrical part, and eight axial slide grooves 201 are evenly formed around the cylindrical surface, and eight groups of swing link mechanisms 103 arranged in an interlaced manner are slidably embedded therein. A drill rod hole 202 is formed through the axis of the guide link 2 for installing the drill rod.

[0023] The hand-held frame 3 includes a cylindrical handle 301 and a center rod 302. The center rod 302 is a cylindrical rod with a through hole formed on the axis, and is movably mounted in the sleeve of the inner support frame 101. One end of the center rod 302 is fixedly connected to the center of the guide connecting rod 2, and the other end is fixedly connected to the center of the handle 301. A cavity is formed in the handle 301, and the through hole of the center rod 302 connects the drill rod hole 202 of the guide connecting rod 2 and the cavity of the handle 301 from both ends, and the drill rod 5 is movably installed in the through hole of the center rod 302.

[0024] The driving mechanism 4 includes a support drive motor 401 and a drill rod motor 402. A pair of support drive motors 401 are symmetrically arranged at one end of the handheld frame 3 close to the support frame 1. A T-shaped bracket extends from the handheld frame 3. The two support drive motors 401 are respectively fixedly installed at both ends of the bracket, and are arranged on both sides of the support frame 1. The motor shaft directions of the two support drive motors 401 are perpendicular to the axis of the support frame 1. Gears are arranged on the motor shafts of the two support drive motors 401, which are respectively engaged with the racks of the inner support frame (101) and the outer support frame (102), and can drive the corresponding sleeves to slide axially separately or simultaneously. A drill rod motor 402 is embedded in the cavity of the handle 301, and its motor shaft is fixedly connected to one end of the drill rod 5. To drive it to rotate and drill holes.

[0025] Each set of swing link mechanisms 103 described above includes a sliding rod 1031, a telescopic rod 1 1032 and a telescopic rod 2 1033. The sliding rod 1031 is a rod with a rectangular cross section, and one end close to the support frame 1 is fixedly connected to the corresponding annular outer edge, and the end away from the support frame 1 is formed with a rectangular protrusion, and a notch parallel to the slide groove 201 is opened in the center of the protrusion, and the sliding rod (1031) is slidably embedded in the slide groove (201). The telescopic rod 1 1032 and the telescopic rod 2 1033 are rectangular cross-section rods of the same length, and both ends of the two are formed with cylindrical hinge shafts on both sides.

[0026] The telescopic foot 104 described above includes an inner telescopic foot 1041 and an outer telescopic foot 1042, both of which are arc-shaped and can be assembled into a set of quarter-circle rings, and four sets of quarter-circle rings can be assembled into a complete circle. The inner side of the inner telescopic foot 1041 and the outer telescopic foot 1042 are both formed with rectangular protrusions, and the center of the protrusions is provided with a vertical circular plane notch.

[0027] One end of a pair of telescopic rods 1032 and 1033 is respectively hinged in the notch on the sliding rod 1031, and the other end is respectively hinged in the notch on the corresponding inner telescopic foot 1041 or outer telescopic foot 1042, forming a parallelogram linkage mechanism. One end of the telescopic rod 1033 hinged to the sliding rod 1031 is provided with a closing torsion spring 105 on its cylindrical hinge shaft. One end of the closing torsion spring 105 is fixed to the telescopic rod 1033, and the other end is fixed to the notch on the sliding rod 1031. The telescopic rod 1033 is driven by the torsion elastic force of the closing torsion spring 105, and has a movement tendency to rotate toward one side of the guide link 2.

[0028] Furthermore, a vertical through slot is formed at the center of one end of the telescopic rod 1032 hinged with the sliding rod 1031, and a horizontal slot is formed at a position away from the hinged end of the through slot. The telescopic rod 2 1033 can be rotated as a whole into the vertical through slot of the telescopic rod 1032, and one end of the telescopic rod 2 1033 hinged with the telescopic foot 104 can be rotated into the horizontal slot. Driven by the torsional elastic force of the closing torsion spring 105, the telescopic rod 2 1033 rotates toward the guide link 2, and due to the nature of the parallelogram link mechanism, the telescopic rod 1 1032 also rotates synchronously until the closing action of the telescopic rod 2 1033 and the telescopic rod 1 1032 being colinearly overlapped is achieved.

[0029] How to use: Before drilling, the medical skull drill of the present invention is initially in a folded state where the telescopic rod 2 1033 and the telescopic rod 1 1032 are colinearly overlapped, and at this time, the four groups of telescopic legs 1041 are in close contact with each other. Fig.13 As shown, a nearly circular ring structure is formed, and the four groups of outer telescopic legs 1042 are located above the inner telescopic legs 1041, corresponding to the two-to-two contacting positions of the inner telescopic legs 1041, and the lower surface of the outer telescopic legs 1042 abuts against the upper surface of the inner telescopic legs 1041. The swing link mechanism 103 of the two is locked due to the abutment relationship and cannot swing outward. Figure 1 As shown, the drill tip of the drill rod 5 is at a distance from or flush with the bottom surface of the nearly circular ring structure of the inner telescopic foot 1041 .

[0030] The first step is to start drilling. The doctor first cuts open the surface skin around the target drilling point of the skull, then puts the four sets of inner telescopic legs 1041 that form a nearly circular ring structure into the incision to continue to stretch the surrounding skin, adjusts the position, and aligns the drill bit of the drill rod 5 with the drilling point, preparing to start drilling.

[0031] The second step is drilling. Start the drill rod motor 402 to drive the drill rod 5 to rotate, then start the support drive motor 401 connected to the rack on the outer support frame 102 to drive the outer support frame 102 to retreat to the handle 301 side. At this time, the four groups of inner telescopic feet 1041 forming a nearly circular ring structure are no longer abutted by the outer telescopic feet 1042. The doctor can hold the medical skull drill of the present invention and exert force downward to make the drill bit of the drill rod 5 contact the skull drilling point to start drilling. While exerting downward force, the support drive motor 401 connected to the rack on the inner support frame 101 is started to drive the inner support frame 101 to slowly retreat. Since the four groups of inner telescopic feet 1041 are no longer abutted by the outer telescopic feet 1042, they are subjected to downward pressure and each opens radially to the four sides. The four groups of swing link mechanisms 103 connected to them are also subjected to force to overcome the retraction force of the retraction torsion spring 105, and the telescopic rod 2 1033 is separated from the telescopic rod 1 1032, ending the overlapping state.

[0032] During this process, the four groups of inner telescopic feet 1041 gradually expand outward, the inner support frame 101 slowly retreats, and the central drill rod 5 is synchronously and slowly fed into the skull. The four groups of inner telescopic feet 1041 continue to provide reliable support and positioning for the doctor while expanding outward, and stretch the surrounding skin.

[0033] The third step is to expand the hole. Continue to manually press down and feed. As the downward pressure continues, the two side surfaces of the four groups of outer telescopic feet 1042 on the upper side gradually approach the side surfaces of the inner telescopic feet 1041 on both sides until they are in contact, and are driven by them to expand outwards until the two are completely assembled to form a Fig.13 The complete ring shape shown.

[0034] In the above process, the four groups of inner telescopic feet 1041 start to expand until they are assembled into a circular ring with the four groups of outer telescopic feet 1042, and the manual feeding is stopped, and the drill rod driving motor 402 is turned off. The feeding distance of the drill rod is related to the retreat distance of the outer support frame 102 in the second step. The more the retreat distance, the more the downward pressure distance required for the assembly and the retreat distance of the inner support frame 101, and the deeper the drill rod drills into the target point of the skull. In particular, the second and third steps are only for drilling the drill rod 5 into the skull to form a borehole, rather than completing the perforation. The depth of the borehole is specifically adjusted according to the above steps according to different patients.

[0035] Step 4: punching. After completing the above steps and stopping manual feeding, the doctor lifts the medical skull drill of the present invention, adjusts the two support drive motors 401, restores the inner support frame 101 and the outer support frame 102 to the state at the beginning of the first step, and the swing link mechanism 103 is driven to fold and overlap by the torsional elastic force of the closing torsion spring 105, and the lower surface of the outer telescopic foot 1042 abuts against the upper surface of the inner telescopic foot 1041. The swing link mechanism 103 of the two is locked due to the abutment relationship. At this time, the drill rod drive motor 402 is started, and the drill rod 5 is aligned with the previously formed drill hole. The two support drive motors 401 are controlled to rotate slowly and synchronously to achieve the movement effect of the overall retreat of the support frame 1 toward the handle 301 side and the slow feeding of the drill rod 5 until the punching is completed.

[0036] During the above process, the lower telescopic foot 104 continuously provides reliable support and positioning for the doctor, and the two supporting drive motors 401 provide controllable and precise drill rod feeding, ensuring the final stable and reliable skull penetration.

[0037] Specific embodiment 2: Based on the specific embodiment 1, the arc-shaped ends of the inner telescopic foot 1041 are inclined to form an inclination trend of contracting inwards from bottom to top, and the arc-shaped ends of the outer telescopic foot 1042 are inclined to form an inclination trend of expanding outwards from bottom to top. The inner telescopic foot 1041 and the outer telescopic foot 1042 have the same inclination angle and can fit tightly. The above-mentioned inclined surface processing makes the circular splicing movement of the inner telescopic foot 1041 and the outer telescopic foot 1042 in the third step of the operation step smoother.

[0038] Specific embodiment 3: Based on the specific embodiment 2, Fig.14 As shown, a through hole is provided on the inner telescopic leg 1041, and the through hole leads from the outer side of the inner telescopic leg 1041 to the inner side, and a flushing water injection pipe is connected to the outer through hole. During the drilling process, physiological saline can be continuously injected into the inner side of the inner telescopic leg 1041 through the water injection pipe to continuously flush and clean the drilling area, ensuring that the operation area is clear and clean.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to be limiting. All variations, modifications, and substitutions within the spirit and principle of the design are within the protection scope of the present invention.

Claims

1. A medical skull drill, characterized in that: It comprises a support frame (1), a guide connecting rod (2), a hand-held frame (3), a driving mechanism (4) and a drill rod (5); The support frame (1) is composed of an inner support frame (101) and an outer support frame (102) as a movable set. The two are hollow cylinders, and a plurality of groups of swing link mechanisms (103) are fixedly connected at the same end. The swing link mechanisms (103) of the inner support frame (101) and the outer support frame (102) are arranged alternately. Each group of swing link mechanisms (103) is equipped with an arc-shaped telescopic foot (104). All the telescopic feet (104) are assembled to form a circular ring structure. A plurality of sliding grooves (201) are evenly distributed on the cylindrical guide link (2), and the swing link mechanism (103) is slidably embedded therein; The guide connecting rod (2) is provided with a drill rod hole (202) extending therethrough at its axis. The handheld frame (3) comprises a cylindrical handle (301) and a hollow central rod (302) which are fixedly connected to each other. One end of the central rod (302) is movably sleeved in the inner support frame (101) and is fixedly connected to the center of the guide connecting rod (2). The drill rod (5) is movably installed in the inner hole of the central rod (302). The driving mechanism (4) comprises a support driving motor (401) and a drill rod motor (402); the support driving motor (401) is fixedly arranged outside the handheld frame (3) and drives the inner support frame (101) and the outer support frame (102) to slide along the central rod (302) individually or synchronously; the drill rod motor (402) is embedded in the handle (301), and the motor shaft is fixedly connected to one end of the drill rod (5).

2. A medical skull drill according to claim 1, characterized in that: Each set of swing link mechanisms (103) comprises a sliding rod (1031), a telescopic rod 1 (1032) and a telescopic rod 2 (1033); the sliding rod (1031) is embedded in the slide groove (201), one end of which is fixedly connected to the corresponding inner support frame (101) or the outer support frame (102), and the other end of which is provided with a protrusion, and a notch parallel to the slide groove (201) is opened at the center of the protrusion; the telescopic rod 1 (1032) and the telescopic rod 2 (1033) are of the same length, and both ends of the two are provided with cylindrical hinge shafts on both sides.

3. A medical skull drill according to claim 2, characterized in that: The telescopic foot (104) comprises an inner telescopic foot (1041) and an outer telescopic foot (1042), both of which are arc-shaped and can be assembled into a partial circular ring. The inner telescopic foot (1041) and the outer telescopic foot (1042) are arranged alternately and can be assembled with adjacent parts to form a partial circular ring. All partial circular rings can form a complete circular ring structure. The inner sides of the inner telescopic foot (1041) and the outer telescopic foot (1042) are both provided with rectangular protrusions, and the centers of the protrusions are provided with notches perpendicular to the plane of the circular ring.

4. A medical skull drill according to claim 3, characterized in that: One end of a pair of telescopic rods 1 (1032) and 1033 is respectively hinged in a notch on the sliding rod (1031), and the other end is respectively hinged in a notch on a corresponding inner telescopic foot (1041) or outer telescopic foot (1042), forming a parallelogram linkage mechanism.

5. A medical skull drill according to claim 4, characterized in that: A vertical through slot is provided at the center of one end of the telescopic rod (1032) hinged to the sliding rod (1031), and a horizontal notch is provided at a position away from the hinged end of the through slot; one end of the telescopic rod (1033) hinged to the telescopic foot (104) can be rotated and received in the notch to overlap with the telescopic rod (1032) in a colinear manner.

6. A medical skull drill according to claim 5, characterized in that: It also includes a closing torsion spring (105), which is arranged at one end of the telescopic rod (1033) and the sliding rod (1031) hinged together; one end of the closing torsion spring (105) is fixed to the telescopic rod (1033), and the other end is fixed to the notch on the sliding rod (1031); the telescopic rod (1033) is driven by the torsional elastic force of the closing torsion spring (105) to rotate toward one side of the guide connecting rod (2) and has a movement tendency to overlap with the telescopic rod (1032) in a colinear manner.

7. A medical skull drill according to claim 6, characterized in that: When the second telescopic rod (1033) and the first telescopic rod (1032) are colinearly overlapped, adjacent inner telescopic legs (1041) fit together to form a nearly circular ring structure, and the outer telescopic legs (1042) are located above the inner telescopic legs (1041) and correspond one-to-one to the adjacent fitting positions of the inner telescopic legs (1041).

8. A medical skull drill according to claim 3, characterized in that: The arc-shaped ends of the inner telescopic foot (1041) have an inclination trend of contracting inwards from bottom to top, and the arc-shaped ends of the outer telescopic foot (1042) have an inclination trend of expanding outwards from bottom to top. The inner telescopic foot (1041) and the outer telescopic foot (1042) have the same inclination angle and can fit tightly.

9. A medical skull drill according to claim 3, characterized in that: A through hole is provided on the inner telescopic leg (1041), and the through hole leads from the arc-shaped outer side of the inner telescopic leg (1041) to the inner side, and a flushing water injection pipe is connected to the outer through hole.

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