Electric drill bit for animal skull defect modeling

Abstract

The invention discloses an electric drill bit for animal skull defect modeling, and belongs to the technical field of electric drill bits. Comprising a drill bit body, an annular interlayer is arranged on the lower portion in the drill bit body, a plurality of sets of fixing needles are arranged in the interlayer, the fixing needles are distributed in an annular array with the drill bit body as the axis, and a bottom annular plate is fixed to the position, around a drill bit of the drill bit body, of the bottom of the drill bit body. When the skull is modeled, firstly, the drill bit body is used for drilling a hole in the skull, when each downward part of the drill bit body needs to be further explored, the fixing needle is moved out of the opening through the push-out mechanism, the fixing needle can be inserted into the partially separated skull bone, then the drill bit body is lifted to judge the skull separation degree, and if the skull separation degree is not enough, the drill bit body is pushed out. By means of the mode, the skull can be separated carefully during drilling, and damage to meninx and brain parenchyma is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of electric drill bits, and more particularly to an electric drill bit used for modeling animal skull defects. Background Art

[0002] The main purpose of animal skull defect modeling is to study the repair mechanism and treatment methods of skull defects, as well as to evaluate the efficacy of different treatment methods. Animal skull defect models are widely used in the field of medical research, especially in neurosurgery and orthopedics. By constructing a skull defect model, researchers can simulate the situation of human skull defects, and then study the repair process, influencing factors and possible treatment methods of skull defects. This model can help scientists understand the regeneration mechanism of bones after skull defects, and how to promote bone regeneration through medical means. In addition, by comparing the efficacy of different treatment methods, it can provide a reference for clinical treatment, improve treatment effects, and promote patient recovery.

[0003] Animal skull defect models are very common. The commonly used tool is an electric drill. However, during the drilling process, the depth may not be well controlled, resulting in direct damage to the brain substance due to penetration of the bone layer, leading to model failure. In order to solve this problem, many patents have been designed for electric drills with limited depth. The purpose is to limit the depth of the drill to prevent the drill from being too deep and damaging the brain substance. However, due to individual differences in animals, the thickness of the skull of each animal is different, and there is no unified standard. If the depth limit is set too deep, the brain substance will still be damaged. If it is too shallow, some thick skulls cannot be drilled through. Generally, the damage occurs at the moment when the bone is about to be drilled through. In actual operation, an operating skill is to evaluate the depth of the drill in real time. Every time you drill down a little, use fine tweezers or a needle to pry or pull up the separated skull. If there is a sense of separation, stop drilling further and use a controllable method of pulling or prying to carefully separate the skull to avoid damage to the meninges and brain parenchyma and complete the modeling. This process cannot be achieved by a depth-limited electric drill. However, it is cumbersome to explore every time you drill a little depth, and when the probe is moved away and then inserted again, the modeling area may be expanded due to the misalignment of the probe. To this end, an electric drill for animal skull defect modeling is proposed. Summary of the invention

[0004] In view of the problem that the brain substance is easily damaged during the drilling process of animal skull modeling in the prior art, the purpose of the present invention is to provide an electric drill bit for animal skull defect modeling.

[0005] To solve the above problems, the present invention adopts the following technical solutions.

[0006] An electric drill for animal skull defect modeling, comprising a drill body, an annular interlayer is arranged at the lower part of the drill body, a plurality of groups of fixing pins are arranged inside the interlayer, the fixing pins are distributed in an annular array with the drill body as the axis, a bottom ring plate is fixed around the drill at the bottom of the drill body, a plurality of groups of openings are arranged on the bottom ring plate, the openings correspond to the number and position of the fixing pins one by one, a push-out mechanism is arranged inside the interlayer, and the push-out mechanism can move the fixing pins out from the openings;

[0007] A rotating ring is provided at the bottom of the interlayer, and a plurality of mounting openings are provided on the surface of the rotating ring. Rubber layers are fixedly connected inside the mounting openings, and the rubber layers correspond to the number of openings one by one. A rotating mechanism is provided inside the interlayer, and the rotating mechanism drives the rotating ring to rotate so that the rubber layer is aligned with or staggered from the opening.

[0008] Optionally, the ejection mechanism includes an annular plate arranged inside the interlayer, the annular plate is slidably sleeved on the drill body, one end of the fixed pin is fixedly connected to the annular plate, the fixed ends of the first electric push rod are fixedly installed on both sides of the top of the interlayer, and the telescopic end of the first electric push rod is fixedly connected to the annular plate.

[0009] Optionally, the rotating mechanism includes a wedge block fixedly mounted on the upper surface of the rotating ring, the upper surface of the wedge block is an inclined surface, the lower surface of the annular plate is fixedly connected to a push plate, the lower end of the push plate is located on the inclined surface of the wedge block, and a reset mechanism is provided between the wedge block and the inner surface of the interlayer.

[0010] Optionally, the reset mechanism includes a fixed block fixedly mounted on the inner surface of the interlayer, an arc rod fixedly connected to the surface of the fixed block, one end of the arc rod is slidably inserted into the inside of the wedge block and forms a moving pair therein, an arc spring is sleeved on the surface of the arc rod, one end of the arc spring is fixedly connected to the fixed block, and the other end of the arc spring is fixedly connected to the wedge block.

[0011] Optionally, a limiting slider is fixedly connected to the top of the wedge block, a notch is provided on the surface of the annular plate, and the limiting slider is located inside the notch.

[0012] Optionally, a sliding groove adapted to the arc-shaped rod is provided inside the wedge-shaped block, and the center of the arc-shaped rod is located on the axis of the drill body.

[0013] Optionally, the fixed needles include a needle rod and a needle head, the needle head and the needle rod are connected by an elastic member, a second electric push rod is fixedly connected inside the needle rod, the telescopic end of the second electric push rod is aligned with the movable end of the needle head, a control member is provided between the needle head and the needle rod, and when the needle head contacts the needle rod, the control member can close the first electric push rod and open the second electric push rod.

[0014] Optionally, the elastic member includes a T-rod, a vertical end of the T-rod is fixedly connected to the needle, a groove is provided inside the needle rod, a horizontal end of the T-rod is located inside the groove and forms a moving pair therein, a telescopic spring is sleeved on the surface of the T-rod, one end of the telescopic spring is fixedly connected to the needle rod, and the other end of the telescopic spring is fixedly connected to the needle, and the telescopic end of the second electric push rod is connected to the horizontal end of the T-rod.

[0015] Optionally, the control member includes a touch block fixedly mounted on a horizontal end surface of the T-bar, a touch switch is fixedly mounted on a side of the inner surface of the slot body away from the T-bar, and the touch switch is located in the moving direction of the touch block.

[0016] Optionally, a plurality of groups of drill teeth are fixedly connected to the bottom edge of the drill bit body, and the drill teeth are distributed in a ring array with the drill bit body as the axis.

[0017] Compared with the prior art, the technical solution provided by the present invention has at least the following beneficial effects:

[0018] In the above scheme, by setting a fixing needle and a pushing mechanism, when modeling the skull, the skull is first drilled using the drill body. When the drill body moves downward and needs to be further explored, the fixing needle is removed from the opening by the pushing mechanism, and the fixing needle can be inserted into the partially separated skull bone. Then, the degree of skull separation is judged by pulling up the drill body. If the separation is not enough, the button is pressed again, the fixing needle is retracted, and the exploration continues until a suitable position is found. This method can carefully separate the skull when drilling to avoid damage to the meninges and brain substance.

[0019] In order to prevent bone fragments from entering the interlayer from the opening during drilling, the present invention provides a rubber layer so that the fixing needle can penetrate the rubber layer and move out from the opening, and the rubber layer can also block the opening to prevent bone fragments from entering the interlayer from the opening.

[0020] By arranging the elastic member and the control member in cooperation, the contact between the needle and the skull can be detected, and the depth of the needle inserted into the skull can be controlled, ensuring that the needle can fix the skull while not piercing too deeply to damage the brain substance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, further serve to explain the principles of the invention and to enable those skilled in the relevant art to make and use the invention.

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0023] Figure 2 For the present invention Figure 1 A partial structural cross-sectional view;

[0024] Figure 3 A cross-sectional view of the drill bit body interlayer of the present invention;

[0025] Figure 4 It is a structural schematic diagram of the ejection mechanism and the fixing needle of the present invention;

[0026] Figure 5 It is a structural schematic diagram of the rotating mechanism of the present invention;

[0027] Figure 6 For the present invention Figure 2 The enlarged view of point A in the middle;

[0028] Figure 7 It is a cross-sectional view of the fixing needle of the present invention.

[0029] [Reference Signs]

[0030] 1. Drill bit body; 2. Interlayer;

[0031] 3. ejection mechanism; 31. annular plate; 32. first electric push rod;

[0032] 4. Opening; 5. Rotating ring; 6. Rubber layer;

[0033] 7. Rotating mechanism; 71. Push plate; 72. Notch; 73. Wedge block; 74. Limiting slider; 75. Fixed block; 76. Arc spring; 77. Arc rod;

[0034] 8. Fixed needle; 81. Second electric push rod; 82. Needle head; 83. Telescopic spring; 84. T-bar; 85. Slot body; 86. Touch block; 87. Touch switch; 88. Needle bar;

[0035] 9. Drill teeth.

[0036] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments. DETAILED DESCRIPTION

[0037] The following is a detailed description of an electric drill for animal skull defect modeling provided by the present invention in conjunction with the accompanying drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art may also adopt other alternative methods to implement some known technologies; and the accompanying drawings are only for a more specific description of the embodiments, and are not intended to specifically limit the present invention.

[0038] It should be noted that the references to "one embodiment", "embodiment", "exemplary embodiments", "some embodiments" and the like in the specification indicate that the embodiments described may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, when a specific feature, structure or characteristic is described in conjunction with an embodiment, it should be within the knowledge of a person skilled in the art to implement such feature, structure or characteristic in conjunction with other embodiments (whether or not explicitly described).

[0039] In general, a term can be understood, at least in part, from its use in context. For example, depending, at least in part, on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending, at least in part, on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0040] It will be understood that the meanings of “on,” “over,” and “above” in the present invention should be interpreted in the broadest manner, so that “on” not only means “directly on” something, but also includes the meaning of being “on” something with intervening features or layers therebetween, and “on” or “over” not only means “on” or “above” something, but also includes the meaning of being “on” or “above” something with no intervening features or layers therebetween.

[0041] Additionally, spatially relative terms such as "under," "beneath," "lower," "above," "upper," and the like may be used herein for descriptive convenience to describe the relationship of one element or feature to another element or features, as shown in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially relative descriptors used herein may be similarly interpreted accordingly.

[0042] like Figures 1 to 7 As shown, an embodiment of the present invention provides an electric drill for animal skull defect modeling, including a drill body 1, an annular interlayer 2 is arranged at the lower part of the drill body 1, and multiple groups of fixing pins 8 are arranged inside the interlayer 2. The fixing pins 8 are distributed in an annular array with the drill body 1 as the axis. A bottom ring plate is fixed around the drill bit at the bottom of the drill body 1, and multiple groups of openings 4 are provided on the bottom ring plate. The openings 4 correspond to the number and position of the fixing pins 8 one by one. An ejection mechanism 3 is arranged inside the interlayer 2, and the ejection mechanism 3 can move the fixing pins 8 out of the openings 4.

[0043] A rotating ring 5 is provided at the bottom of the interlayer 2, and a plurality of mounting openings are provided on the surface of the rotating ring 5. Rubber layers 6 are fixedly connected inside the mounting openings. The number of rubber layers 6 corresponds to the number of openings 4. A rotating mechanism 7 is provided inside the interlayer 2. The rotating mechanism 7 drives the rotating ring 5 to rotate so that the rubber layer 6 is aligned with or staggered from the opening 4.

[0044] The ejection mechanism 3 includes an annular plate 31 arranged inside the interlayer 2, the annular plate 31 is slidably mounted on the drill body 1, one end of the fixed pin 8 is fixedly connected to the annular plate 31, and the fixed ends of the first electric push rod 32 are fixedly installed on both sides of the top of the interlayer 2, and the telescopic end of the first electric push rod 32 is fixedly connected to the annular plate 31.

[0045] In this embodiment, the drill body 1 is connected to the handle through a drill rod, wherein a motor should be provided inside the handle to connect the drill rod, wherein the handle should be provided with switch buttons for respectively controlling the motor and the first electric push rod 32. By pressing the button for controlling the motor, the motor can be turned on, driving the drill rod and the drill body 1 to rotate, thereby achieving drilling of the skull.

[0046] The interlayer 2 is used to accommodate the fixing needle 8 and the ejection mechanism 3, etc. When modeling the skull, the skull is first drilled using the drill body 1. When the drill body 1 needs to be further explored downward, the button for controlling the first electric push rod 32 is pressed, and the first electric push rod 32 is extended, which can drive the annular plate 31 and the fixing needle 8 to move, so that the fixing needle 8 is moved out of the opening 4, and the fixing needle 8 can be inserted into the partially separated skull bone. Then, the degree of skull separation can be judged by pulling up the drill body 1. If the separation is not enough, press the button again, the fixing needle 8 is retracted, and continues to explore until a suitable position is found.

[0047] In order to prevent bone fragments from entering the interior of the interlayer 2 from the opening 4 during drilling, a rubber layer 6 is provided so that the fixing needle 8 can penetrate the rubber layer 6 and move out from the opening 4. The rubber layer 6 can also block the opening 4 to prevent bone fragments from entering the interior of the interlayer 2 from the opening 4.

[0048] In addition, by setting the rotating mechanism 7, the relative positions of the rubber layer 6, the fixing needle 8 and the opening 4 can be adjusted. When the fixing needle 8 needs to be inserted, the rotating mechanism 7 is used to drive the rotating ring 5 to rotate so that the rubber layer 6 on the rotating ring 5 is aligned with the fixing needle 8 and the opening 4. When drilling, the rotating mechanism 7 is used to drive the rotating ring 5 to rotate so that the rubber layer 6 on the rotating ring 5 is staggered with the opening 4, thereby moving the rubber layer 6 to the inside of the interlayer 2 to prevent the rubber layer 6 from being accidentally scratched when drilling.

[0049] like Figures 4 to 6As shown, the rotating mechanism 7 includes a wedge block 73 fixedly mounted on the upper surface of the rotating ring 5, the upper surface of the wedge block 73 is an inclined surface, and a push plate 71 is fixedly connected to the lower surface of the annular plate 31, and the lower end of the push plate 71 is located on the inclined surface of the wedge block 73, and a reset mechanism is provided between the wedge block 73 and the inner surface of the interlayer 2.

[0050] The reset mechanism includes a fixed block 75 fixedly installed on the inner surface of the interlayer 2, and an arc rod 77 is fixedly connected to the surface of the fixed block 75. One end of the arc rod 77 is slidably inserted into the inside of the wedge block 73 and forms a moving pair therein. An arc spring 76 is sleeved on the surface of the arc rod 77, one end of the arc spring 76 is fixedly connected to the fixed block 75, and the other end of the arc spring 76 is fixedly connected to the wedge block 73.

[0051] The top of the wedge block 73 is fixedly connected to a limiting slider 74 . A notch 72 is formed on the surface of the annular plate 31 , and the limiting slider 74 is located inside the notch 72 .

[0052] In this embodiment, by providing the notch 72 , when the annular plate 31 drives the fixing needle 8 to move out, the wedge block 73 can pass through the notch 72 to prevent movement interference with the annular plate 31 and the fixing needle 8 .

[0053] The wedge block 73 has a sliding groove inside which is adapted to the arc rod 77 , and the center of the arc rod 77 is located on the axis of the drill body 1 .

[0054] Initially, the rubber layer 6 on the rotating ring 5 is in a staggered state with the opening 4. In this state, the fixing needle 8 and the ejection mechanism 3 are both located inside the interlayer 2, ensuring that the drill body 1 can perform the drilling work normally.

[0055] The movement stage of the push plate 71 and the wedge block 73 can be divided into two stages. In the first stage, the first electric push rod 32 drives the annular plate 31 and the push plate 71 to move, so that the push plate 71 and the inclined surface of the wedge block 73 move relative to each other. At this time, the wedge block 73 deflects, and the rubber layer 6 gradually aligns with the opening 4. In the second stage, when the push plate 71 moves away from the inclined surface of the wedge block 73 and abuts against the side wall of the wedge block 73, the wedge block 73 no longer deflects, the rubber layer 6 is just aligned with the opening 4, and the annular plate 31 continues to move, driving the fixing needle 8 to pass through the rubber layer 6 and move out from the opening 4.

[0056] When the first electric push rod 32 is extended and drives the annular plate 31 to move, the push plate 71 fixedly mounted on the annular plate 31 moves accordingly. Since one end of the push plate 71 is located on the inclined surface of the wedge block 73, when the push plate 71 moves, it pushes the wedge block 73, causing the wedge block 73 to deflect. One end of the arc rod 77 penetrates into the inside of the wedge block 73, and the arc spring 76 sleeved on the surface of the arc rod 77 is compressed. When the wedge block 73 deflects, it drives the rotating ring 5 and the rubber layer 6 to rotate, so that the rubber layer 6 on the rotating ring 5 is aligned with the opening 4, so that the fixing needle 8 can pass through the rubber layer 6 and move out of the opening 4; when it is necessary to retract the fixing needle 8, the first electric push rod 32 is driven to retract, driving the annular plate 31 and the fixing needle 8 to move back to the inside of the interlayer 2, and the compressed arc spring 76 is reset, driving the wedge block 73, the rotating ring 5 and the rubber layer 6 to reset, so that the rubber layer 6 is staggered with the opening 4.

[0057] like Figure 7 As shown, the fixed needle 8 includes a needle rod 88 and a needle head 82, and the needle head 82 and the needle rod 88 are connected by an elastic member, and a second electric push rod 81 is fixedly connected inside the needle rod 88, and the telescopic end of the second electric push rod 81 is aligned with the movable end of the needle head 82, and a control member is arranged between the needle head 82 and the needle rod 88, and when the needle head 82 contacts the needle rod 88, the control member can close the first electric push rod 32 and open the second electric push rod 81.

[0058] The elastic member includes a T-shaped rod 84, a vertical end of which is fixedly connected to the needle 82, a groove 85 is provided inside the needle rod 88, a horizontal end of the T-shaped rod 84 is located inside the groove 85 and forms a moving pair therein, a telescopic spring 83 is sleeved on the surface of the T-shaped rod 84, one end of the telescopic spring 83 is fixedly connected to the needle rod 88, and the other end of the telescopic spring 83 is fixedly connected to the needle 82, and the telescopic end of the second electric push rod 81 is connected to the horizontal end of the T-shaped rod 84.

[0059] The control member includes a touch block 86 fixedly mounted on a horizontal end surface of a T-shaped rod 84 , and a touch switch 87 is fixedly mounted on a side of the inner surface of the groove body 85 away from the T-shaped rod 84 , and the touch switch 87 is located in the moving direction of the touch block 86 .

[0060] In this embodiment, by arranging the elastic member and the control member to cooperate, it is possible to detect that the needle 82 contacts the skull, and to control the depth of the needle 82 inserted into the skull. Specifically, when the first electric push rod 32 drives the fixing needle 8 to move out of the opening 4 and the needle 82 of the fixing needle 8 contacts the skull, first, the needle 82 moves toward the needle rod 88, the telescopic spring 83 is compressed, and the T-bar 84 on the needle 82 extends into the groove 85. When the touch block 86 on the T-bar 84 contacts the touch switch 87, the touch switch 87 closes the first electric push rod 32 and opens the second electric push rod 81. The second electric push rod 81 extends, thereby pushing the T-bar 84 and the needle 82 to move, and the moving stroke of the T-bar 84 and the needle 82 is limited by the groove 85, that is, the depth of the needle 82 inserted into the skull can be controlled. This depth can be set according to actual conditions, while ensuring that the needle 82 can fix the skull, it will not be inserted too deep to damage the brain substance.

[0061] It should be noted that the touch switch 87 is a single-pole double-throw switch, and the first electric push rod 32 and the second electric push rod 81 are connected in parallel. When the touch block 86 contacts the touch switch 87, the single-pole double-throw switch cuts off the circuit of the first electric push rod 32 and connects the circuit of the second electric push rod 81. In addition, a control button for separately controlling the first electric push rod 32 and the second electric push rod 81 should be set on the handle of the drill body 1, and the user can manually control the first electric push rod 32 and the second electric push rod 81 through the control buttons.

[0062] In this embodiment, both the first electric push rod 32 and the second electric push rod 81 can be used with a controller, and the controller can control the extension or contraction of the first electric push rod 32 and the second electric push rod 81. The controller can select a single-chip microcomputer as a control unit. The single-chip microcomputer is composed of an arithmetic unit, a memory, an input and output device, etc., which is equivalent to a microcomputer. Compared with the general-purpose microprocessor used in personal computers, it emphasizes self-supply (no external hardware) and cost saving. Its biggest advantage is that it is small in size and can be placed inside the instrument, but it has a small storage capacity, a simple input and output interface, and low functional consumption. In this embodiment, the model of the single-chip microcomputer is not required.

[0063] A plurality of groups of drill teeth 9 are fixedly connected to the bottom edge of the drill body 1 , and the drill teeth 9 are distributed in a ring array with the drill body 1 as the axis.

[0064] In this embodiment, by arranging drill teeth 9 at the edge of the drill body 1, when the drill body 1 is drilling, the drill teeth 9 can cut the edge of the skull hole, so that the edge of the skull hole is cut neatly.

[0065] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail.

[0066] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An electric drill bit for animal skull defect modeling, comprising a drill bit body, characterized in that: An annular interlayer is arranged at the lower part of the drill body, and multiple groups of fixing needles are arranged inside the interlayer. The fixing needles are distributed in an annular array with the drill body as the axis. A bottom ring plate is fixed around the drill bit of the drill body at the bottom of the drill body, and multiple groups of openings are arranged on the bottom ring plate. The openings correspond to the number and position of the fixing needles one by one. An ejection mechanism is arranged inside the interlayer, and the ejection mechanism can move the fixing needles out of the openings. A rotating ring is provided at the bottom of the interlayer, and a plurality of mounting openings are provided on the surface of the rotating ring. Rubber layers are fixedly connected inside the mounting openings, and the rubber layers correspond to the number of openings one by one. A rotating mechanism is provided inside the interlayer, and the rotating mechanism drives the rotating ring to rotate so that the rubber layer is aligned with or staggered from the opening.

2. The electric drill bit for animal skull defect modeling according to claim 1, characterized in that: The ejection mechanism includes an annular plate arranged inside the interlayer, the annular plate is slidably sleeved on the drill body, one end of the fixed pin is fixedly connected to the annular plate, the fixed ends of the first electric push rod are fixedly installed on both sides of the top of the interlayer, and the telescopic end of the first electric push rod is fixedly connected to the annular plate.

3. The electric drill bit for animal skull defect modeling according to claim 2, characterized in that: The rotating mechanism includes a wedge block fixedly mounted on the upper surface of a rotating ring, the upper surface of the wedge block is an inclined surface, a push plate is fixedly connected to the lower surface of the annular plate, the lower end of the push plate is located on the inclined surface of the wedge block, and a reset mechanism is provided between the wedge block and the inner surface of the interlayer.

4. The electric drill bit for animal skull defect modeling according to claim 3, characterized in that: The reset mechanism includes a fixed block fixedly installed on the inner surface of the interlayer, an arc rod is fixedly connected to the surface of the fixed block, one end of the arc rod is slidably inserted into the inside of the wedge block and forms a moving pair therein, an arc spring is sleeved on the surface of the arc rod, one end of the arc spring is fixedly connected to the fixed block, and the other end of the arc spring is fixedly connected to the wedge block.

5. The electric drill bit for animal skull defect modeling according to claim 4, characterized in that: The top of the wedge block is fixedly connected to a limiting slider, a surface of the annular plate is provided with a notch, and the limiting slider is located inside the notch.

6. The electric drill bit for animal skull defect modeling according to claim 5, characterized in that: A sliding groove adapted to the arc-shaped rod is provided inside the wedge-shaped block, and the center of the arc-shaped rod is located on the axis of the drill body.

7. The electric drill bit for animal skull defect modeling according to claim 1, characterized in that: The fixed needles all include a needle rod and a needle head, the needle head and the needle rod are connected by an elastic member, a second electric push rod is fixedly connected inside the needle rod, the telescopic end of the second electric push rod is aligned with the movable end of the needle head, a control member is provided between the needle head and the needle rod, and when the needle head contacts the needle rod, the control member can close the first electric push rod and open the second electric push rod.

8. The electric drill bit for animal skull defect modeling according to claim 7, characterized in that: The elastic member includes a T-rod, a vertical end of which is fixedly connected to the needle, a groove is provided inside the needle rod, a horizontal end of the T-rod is located inside the groove and forms a moving pair therein, a telescopic spring is sleeved on the surface of the T-rod, one end of the telescopic spring is fixedly connected to the needle rod, and the other end of the telescopic spring is fixedly connected to the needle, and the telescopic end of the second electric push rod is connected to the horizontal end of the T-rod 84.

9. The electric drill bit for animal skull defect modeling according to claim 8, characterized in that: The control member comprises a touch block fixedly mounted on the horizontal end surface of the T-shaped rod, and a touch switch is fixedly mounted on the inner surface of the slot body away from the T-shaped rod, and the touch switch is located in the moving direction of the touch block.

10. The electric drill bit for animal skull defect modeling according to claim 1, characterized in that: A plurality of groups of drill teeth are fixedly connected to the bottom edge of the drill body, and the drill teeth are distributed in a ring array with the drill body as the axis.

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