An electric drill bit for modeling skull defects in animals

Abstract

The application discloses a kind of electric drill for animal skull defect modeling, belong to electric drill technical field.It includes drill bit body, the annular interlayer is arranged in the lower part of drill bit body, the fixed needle of multiple groups is arranged in the inside of interlayer, the fixed needle is annular array distribution with drill bit body as shaft, bottom ring plate is fixed around the drill bit of drill bit body with the bottom of drill bit body, the fixed needle is removed from opening by push-out mechanism when further exploring when first using drill bit body to drill hole to skull when skull modeling, the fixed needle can be inserted into part of separated skull bone, the degree of skull separation is judged by lifting drill bit body, if separation is not enough, press button again, the fixed needle is retracted, continue to explore until suitable position is found, this mode can carefully separate skull when drilling, avoid meninges and brain parenchyma injury.

Description

Technical Field

[0001] This invention relates to the field of electric drill technology, and more specifically, to an electric drill for creating models of skull defects in animals. Background Technology

[0002] The primary purpose of animal models of skull defects is to study the repair mechanisms and treatment methods for skull defects, as well as to evaluate the efficacy of different treatments. Animal models of skull defects are widely used in medical research, especially in neurosurgery and orthopedics. By constructing skull defect models, researchers can simulate human skull defects, thereby studying the repair process, influencing factors, and possible treatment methods. These models can help scientists understand the regeneration mechanisms of bone after skull defects and how to promote bone regeneration through medical means. Furthermore, comparing the efficacy of different treatment methods can provide a reference for clinical treatment, improve treatment outcomes, and promote patient recovery.

[0003] Animal models of skull defects are very common, and electric drills are frequently used. However, during drilling, it's easy to miscontrol the depth, leading to penetration of the bone layer and direct damage to the brain parenchyma, resulting in model failure. To address this issue, many patents have been designed with depth-limiting electric drills to prevent excessive drilling that could damage the brain parenchyma. However, due to individual differences among animals, the thickness of each animal's skull varies, and there is no uniform standard. Setting the depth too deep can still damage the brain parenchyma, while setting it too shallow may prevent drilling through some thicker skulls. Generally, damage occurs just before the drill bit penetrates the bone. In practice, a crucial technique is to continuously assess the drill depth. Each time the drill penetrates a little, use fine tweezers or a needle to gently pry or pull the separated skull. If separation is felt, stop drilling further and carefully separate the skull using a controlled pulling or prying method to avoid damage to the meninges and brain parenchyma, thus completing the modeling process. This process is impossible with depth-limited electric drills. However, checking at each drilling depth is tedious, and removing and re-inserting the probe may lead to an enlarged modeling area due to probe misalignment. Therefore, an electric drill bit for modeling animal skull defects is proposed. Summary of the Invention

[0004] In view of the problem that the drilling process for animal skull modeling can easily damage the brain parenchyma, the present invention aims to provide an electric drill bit for animal skull defect modeling.

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

[0006] An electric drill bit for modeling animal skull defects includes a drill bit body. An annular interlayer is provided in the lower part of the drill bit body. Multiple sets of fixing pins are provided inside the interlayer. The fixing pins are arranged in a annular array around the drill bit body as an axis. A bottom ring plate is fixed around the drill bit of the drill bit body at the bottom of the drill bit body. Multiple sets of openings are provided on the bottom ring plate. The number and position of the openings correspond one-to-one with the number of fixing pins. An ejection mechanism is provided inside the interlayer. The ejection mechanism can remove the fixing pins from the openings.

[0007] The bottom of the interlayer is provided with a rotating ring, and the surface of the rotating ring is provided with multiple sets of mounting holes. Each mounting hole is fixedly connected with a rubber layer, and the number of rubber layers corresponds one-to-one with the number of openings. The interlayer is provided with a rotating mechanism, which drives the rotating ring to rotate, so that the rubber layers are aligned with or staggered from the openings.

[0008] Optionally, the ejection mechanism includes an annular plate disposed inside the interlayer, the annular plate being slidably sleeved on the drill bit body, one end of each fixing pin being fixedly connected to the annular plate, and the fixed ends of the first electric push rods being fixedly installed on both sides of the top of the interlayer, and the telescopic ends of the first electric push rods being 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 being an inclined surface, a push plate fixedly connected to the lower surface of the annular plate, the lower end of the push plate being located on the inclined surface of the wedge block, and a reset mechanism being provided between the wedge block and the inner surface of the interlayer.

[0010] Optionally, the reset mechanism includes a fixed block fixedly installed on the inner surface of the interlayer, an arc-shaped rod fixedly connected to the surface of the fixed block, one end of the arc-shaped rod being slidably inserted into the wedge-shaped block and forming a sliding pair therein, an arc-shaped spring being sleeved on the surface of the arc-shaped rod, one end of the arc-shaped spring being fixedly connected to the fixed block, and the other end of the arc-shaped spring being fixedly connected to the wedge-shaped block.

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

[0012] Optionally, the wedge block has a groove inside that matches the arc-shaped rod, and the center of the arc-shaped rod is located on the axis of the drill bit body.

[0013] Optionally, each of the fixed needles includes a needle bar and a needle tip, which are connected by an elastic element. A second electric push rod is fixedly connected inside the needle bar. The telescopic end of the second electric push rod is aligned with the moving end of the needle tip. A control element is provided between the needle tip and the needle bar. When the needle tip contacts the needle bar, the control element can close the first electric push rod and open the second electric push rod.

[0014] Optionally, the elastic element includes a T-shaped rod, the vertical end of which is fixedly connected to the needle tip. A groove is formed inside the needle rod, and the horizontal end of the T-shaped rod is located inside the groove and forms a sliding pair therein. A telescopic spring is sleeved on the surface of the T-shaped rod, one end of which is fixedly connected to the needle rod, and the other end of which is fixedly connected to the needle tip. The telescopic end of the second electric push rod is connected to the horizontal end of the T-shaped rod.

[0015] Optionally, the control element includes a touch block fixedly installed on the horizontal end surface of the T-shaped rod, and a touch switch fixedly installed on the inner surface of the groove away from the T-shaped rod, the touch switch being located in the direction of movement of the touch block.

[0016] Optionally, multiple sets 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 this invention has at least the following beneficial effects:

[0018] In the above scheme, by setting up a fixing pin and a pushing mechanism, when modeling the skull, the drill bit body is first used to drill a hole in the skull. When the drill bit body needs to be further explored at each step, the fixing pin is moved out of the opening by the pushing mechanism. The fixing pin can then be inserted into the partially separated skull bone. The degree of skull separation is then judged by pulling up the drill bit body. If the separation is insufficient, the button is pressed again, the fixing pin is retracted, and the drilling continues until a suitable position is found. This method can carefully separate the skull during drilling and avoid damage to the meninges and brain parenchyma.

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

[0020] By combining elastic and control components, the system can detect the contact between the needle and the skull and control the depth of the needle insertion into the skull. This ensures that the needle can fix the skull without penetrating too deeply and causing damage to the brain parenchyma. Attached Figure Description

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

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention;

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

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

[0025] Figure 4 This is a schematic diagram of the ejection mechanism and the fixing pin of the present invention;

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

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

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

[0029] [Figure Labels]

[0030] 1. Drill bit body; 2. Intercalation layer;

[0031] 3. Pushing 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. Fixing block; 76. Arc spring; 77. Arc rod;

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

[0035] 9. Drill teeth.

[0036] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation

[0037] The electric drill bit for creating models of animal skull defects provided by the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should also be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art can use other alternative methods to implement some known technologies; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0038] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.

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

[0040] It is understood that the meanings of “on”, “above”, and “above” in this invention should be interpreted in the broadest manner, such that “on” means not only “directly on” something, but also includes the meaning of being “on” something with an intervening feature or layer, and that “above” or “above” means not only “on” something, but also includes the meaning of being “on” something without an intervening feature or layer.

[0041] Furthermore, spatially related terms such as “below,” “under,” “lower,” “above,” and “upper” are used herein for convenience to describe the relationship of one element or feature to one or more other elements or features, as illustrated in the accompanying drawings. Spatially related terms are intended to cover different orientations in the use or operation of the device other than those depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially related descriptive terms used herein can be interpreted similarly.

[0042] like Figures 1 to 7 As shown, this embodiment of the invention provides an electric drill bit for modeling animal skull defects, including a drill bit body 1, an annular interlayer 2 in the lower part of the drill bit body 1, multiple sets of fixing pins 8 inside the interlayer 2, the fixing pins 8 are arranged in a circular array around the drill bit body 1 as an axis, a bottom ring plate is fixed around the drill bit of the drill bit body 1 at the bottom of the drill bit body 1, multiple sets of openings 4 are opened on the bottom ring plate, the number and position of the openings 4 correspond one-to-one with the number of fixing pins 8, and a push-out mechanism 3 is provided inside the interlayer 2, the push-out mechanism 3 can remove the fixing pins 8 from the openings 4.

[0043] The bottom of the interlayer 2 is provided with a rotating ring 5. Multiple sets of mounting holes are opened on the surface of the rotating ring 5. A rubber layer 6 is fixedly connected inside each mounting hole. The number of rubber layers 6 corresponds one-to-one with the number of openings 4. The interlayer 2 is provided with a rotating mechanism 7. 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 disposed inside the interlayer 2. The annular plate 31 is slidably sleeved on the drill bit body 1. One end of each fixing pin 8 is fixedly connected to the annular plate 31. 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 ends of the first electric push rod 32 are fixedly connected to the annular plate 31.

[0045] In this embodiment, the drill body 1 is connected to the handle via a drill rod. A motor is installed inside the handle to connect to the drill rod, and the handle is equipped with switches for controlling both the motor and the first electric push rod 32. Pressing the motor control button activates the motor, causing the drill rod and drill body 1 to rotate, thereby drilling a hole in 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 drill body 1 is first used to drill a hole in the skull. When the drill body 1 needs to be further explored downward, the button controlling the first electric push rod 32 is pressed. The first electric push rod 32 extends, which can drive the annular plate 31 and the fixing needle 8 to move, so that the fixing needle 8 can be moved out of the opening 4. The fixing needle 8 can then be inserted into the partially separated skull bone. Then, by pulling up the drill body 1, the degree of skull separation is judged. If the separation is insufficient, the button is pressed again, the fixing needle 8 is retracted, and the exploration continues until a suitable position is found.

[0047] To prevent bone fragments from entering the interlayer 2 through the opening 4 during drilling, a rubber layer 6 is provided. The fixing pin 8 can penetrate the rubber layer 6 and move out through the opening 4. The rubber layer 6 can also seal the opening 4 to prevent bone fragments from entering the interlayer 2 through 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 protruded, the rotating mechanism 7 drives 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 drives the rotating ring 5 to rotate, so that the rubber layer 6 on the rotating ring 5 is misaligned with the opening 4, thereby moving the rubber layer 6 into the interlayer 2 and preventing the rubber layer 6 from being accidentally scratched during drilling.

[0049] like Figures 4 to 6As shown, the rotating mechanism 7 includes a wedge block 73 fixedly installed on the upper surface of the rotating ring 5. The upper surface of the wedge block 73 is an inclined surface. A push plate 71 is fixedly connected to the lower surface of the annular plate 31. The lower end of the push plate 71 is located on the inclined surface of the wedge block 73. 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. An arc-shaped rod 77 is fixedly connected to the surface of the fixed block 75. One end of the arc-shaped rod 77 is slidably inserted into the wedge-shaped block 73 and forms a sliding pair inside it. An arc-shaped spring 76 is sleeved on the surface of the arc-shaped rod 77. One end of the arc-shaped spring 76 is fixedly connected to the fixed block 75, and the other end of the arc-shaped spring 76 is fixedly connected to the wedge-shaped block 73.

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

[0052] In this embodiment, by setting a notch 72, when the annular plate 31 moves the fixing pin 8 out, the wedge block 73 can pass through the notch 72 to prevent movement interference to the annular plate 31 and the fixing pin 8.

[0053] The wedge block 73 has a groove inside that matches the arc rod 77, and the center of the arc rod 77 is located on the axis of the drill bit body 1.

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

[0055] The movement 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, causing the push plate 71 and the inclined surface of the wedge block 73 to 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 exactly aligned with the opening 4, and the annular plate 31 continues to move, driving the fixing pin 8 to pass through the rubber layer 6 and move out from the opening 4.

[0056] In this embodiment, when the first electric push rod 32 extends and moves the annular plate 31, 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 will push the wedge block 73, causing the wedge block 73 to deflect. One end of the arc rod 77 penetrates into 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 will drive 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 pin 8 can pass through the rubber layer 6 and move out from the opening 4. When it is necessary to retract the fixing pin 8, the first electric push rod 32 is driven to retract, driving the annular plate 31 and the fixing pin 8 back to the interior of the interlayer 2. 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 misaligned with the opening 4.

[0057] like Figure 7 As shown, each of the fixed needles 8 includes a needle bar 88 and a needle head 82. The needle head 82 and the needle bar 88 are connected by an elastic element. A second electric push rod 81 is fixedly connected inside the needle bar 88. The telescopic end of the second electric push rod 81 is aligned with the moving end of the needle head 82. A control element is provided between the needle head 82 and the needle bar 88. When the needle head 82 contacts the needle bar 88, the control element can close the first electric push rod 32 and open the second electric push rod 81.

[0058] The elastic element includes a T-shaped rod 84, the vertical end of which is fixedly connected to the needle 82. A groove 85 is provided inside the needle bar 88. The horizontal end of the T-shaped rod 84 is located inside the groove 85 and forms a sliding 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 bar 88, and the other end of the telescopic spring 83 is fixedly connected to the needle 82. 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 component includes a touch block 86 fixedly installed on the horizontal end surface of the T-shaped rod 84, and a touch switch 87 fixedly installed on the inner surface of the groove 85 away from the T-shaped rod 84, with the touch switch 87 located in the direction of movement of the touch block 86.

[0060] In this embodiment, by setting an elastic element and a control element in cooperation, it is possible to detect the contact between the needle tip 82 and the skull, and to control the depth of the needle tip 82 inserted into the skull. Specifically, when the first electric push rod 32 drives the fixed needle 8 to move out of the opening 4 and the needle tip 82 of the fixed needle 8 contacts the skull, the needle tip 82 will first move towards the side of the needle bar 88, the telescopic spring 83 will be compressed, and the T-shaped rod 84 on the needle tip 82 will extend into the groove 85. When the contact block 86 on the T-shaped rod 84 contacts the touch switch 87, the touch switch 87 will close the first electric push rod 32 and open the second electric push rod 81. The second electric push rod 81 will extend, thereby pushing the T-shaped rod 84 and the needle tip 82 to move. The movement stroke of the T-shaped rod 84 and the needle tip 82 is limited by the groove 85, that is, the depth of the needle tip 82 inserted into the skull can be controlled. This depth can be set according to the actual situation, ensuring that the needle tip 82 can fix the skull without inserting too deeply and causing damage to the brain parenchyma.

[0061] It should be noted that the touch switch 87 is a single-pole double-throw switch. The first electric actuator 32 and the second electric actuator 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 actuator 32 and connects the circuit of the second electric actuator 81. In addition, a separate control button for controlling the first electric actuator 32 and the second electric actuator 81 should be provided on the handle of the drill bit body 1. The user can manually control them through the control buttons of the first electric actuator 32 and the second electric actuator 81.

[0062] In this embodiment, both the first electric actuator 32 and the second electric actuator 81 can be used with a controller. The controller can control the extension or retraction of the first electric actuator 32 and the second electric actuator 81. The controller can be a microcontroller, which consists of an arithmetic logic unit (ALU), memory, input / output devices, etc., essentially a miniature computer. Compared to general-purpose microprocessors used in personal computers, it emphasizes self-sufficiency (no external hardware required) and cost savings. Its biggest advantage is its small size, allowing it to be placed inside the instrument, but it has limited storage capacity, simple input / output interfaces, and low power consumption. In this embodiment, the model of the microcontroller is not specified.

[0063] Multiple sets of drill teeth 9 are fixedly connected to the bottom edge of the drill bit body 1, and the drill teeth 9 are arranged in a ring array with the drill bit body 1 as the axis.

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

[0065] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0066] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An electric drill bit for creating models of skull defects in animals, comprising a drill bit body, characterized in that, The lower part of the drill bit body is provided with an annular interlayer. Multiple sets of fixing pins are provided inside the interlayer. The fixing pins are arranged in a ring array around the drill bit body as the axis. A bottom ring plate is fixed around the drill bit body at the bottom of the drill bit body. Multiple sets of openings are opened on the bottom ring plate. The number and position of the openings correspond one-to-one with the number of fixing pins. An ejection mechanism is provided inside the interlayer. The ejection mechanism can remove the fixing pins from the openings. The bottom of the interlayer is provided with a rotating ring, and the surface of the rotating ring is provided with multiple sets of mounting holes. Each mounting hole is fixedly connected with a rubber layer, and the number of rubber layers corresponds one-to-one with the number of openings. The interlayer is provided with a rotating mechanism, which drives the rotating ring to rotate, so that the rubber layers are aligned with or staggered from the openings. The ejection mechanism includes an annular plate disposed inside the interlayer, the annular plate being slidably sleeved on the drill bit body, one end of each of the fixing pins being fixedly connected to the annular plate, and the fixed ends of the first electric push rods being fixedly installed on both sides of the top of the interlayer, and the telescopic ends of the first electric push rods being fixedly connected to the annular plate. The rotating mechanism includes a wedge block fixedly installed on the upper surface of the 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. A reset mechanism is provided between the wedge block and the inner surface of the interlayer. The reset mechanism includes a fixed block fixedly installed on the inner surface of the interlayer. An arc-shaped rod is fixedly connected to the surface of the fixed block. One end of the arc-shaped rod is slidably inserted into the inside of the wedge-shaped block and forms a sliding pair therein. An arc-shaped spring is sleeved on the surface of the arc-shaped rod. One end of the arc-shaped spring is fixedly connected to the fixed block, and the other end of the arc-shaped spring is fixedly connected to the wedge-shaped block. The wedge block is fixedly connected to the top of the wedge block, and the annular plate has a notch on its surface, with the limiting slider located inside the notch. The wedge-shaped block has a groove inside that matches the arc-shaped rod, and the center of the arc-shaped rod is located on the axis of the drill bit body; Each fixed needle includes a needle bar and a needle tip. The needle tip and needle bar are connected by an elastic element. A second electric push rod is fixedly connected inside the needle bar. The telescopic end of the second electric push rod is aligned with the moving end of the needle tip. A control element is provided between the needle tip and the needle bar. When the needle tip contacts the needle bar, the control element can close the first electric push rod and open the second electric push rod.

2. The electric drill bit for creating models of animal skull defects according to claim 1, characterized in that, The elastic element includes a T-shaped rod, the vertical end of which is fixedly connected to the needle tip. A groove is formed inside the needle rod, and the horizontal end of the T-shaped rod is located inside the groove and forms a sliding pair therein. A telescopic spring is sleeved on the surface of the T-shaped rod, one end of which is fixedly connected to the needle rod, and the other end of which is fixedly connected to the needle tip. The telescopic end of the second electric push rod is connected to the horizontal end of the T-shaped rod.

3. The electric drill bit for creating models of animal skull defects according to claim 2, characterized in that, The control component includes a touch block fixedly installed on the horizontal end surface of the T-shaped rod, and a touch switch fixedly installed on the inner surface of the groove away from the T-shaped rod, the touch switch being located in the direction of movement of the touch block.

4. The electric drill bit for creating models of animal skull defects according to claim 1, characterized in that, Multiple sets 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.

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