An electric drill for minimally invasive craniotomy of animals

Abstract

The invention discloses an electric drill for minimally invasive craniotomy of animals, including a rotary power drive unit, a rotating seat, an adjusting screw sleeve, a drill barrel, a positioning pin, a positioning sleeve, and a first depth monitoring component; a plurality of annular mounting grooves are evenly provided at the bottom of the rotating seat, and the top is fixedly connected to the rotary power drive unit; the adjusting screw sleeve is threadedly connected to the outer wall of the rotating seat; the top of the drill barrel and the annular mounting groove of the same size are detachably plugged; the top of the positioning pin is connected to the rotating seat and coaxially passes through the axis of the rotating seat; the positioning sleeve is arranged on the rotating seat; the first depth monitoring component is installed at the bottom of the positioning sleeve, and can measure the craniotomy depth as the drill barrel rotates on the skull. The invention provides an electric drill for minimally invasive craniotomy with adjustable craniotomy diameter and control of craniotomy depth, which can be widely used in brain science research of animal skull drilling and treatment of head diseases such as removal of brain hydatids, as well as catering industry personnel for opening cattle, sheep, and pig skulls to remove brain flowers, etc.

Description

Technical Field

[0001] The invention relates to the technical field of animal medical instruments, and more particularly to an electric drill for minimally invasive craniotomy in animals. Background Art

[0002] At present, the craniotomy drill used in craniotomy experiments and studies on animals such as cattle, sheep, pigs, deer, elephants, tigers, lions, and leopards is relatively bulky and has poor flexibility. Chinese utility model patent No. 201520672450.5 discloses a manual craniotomy drill kit. The manual craniotomy drill kit can be operated by one person to perform craniotomy due to the presence of a positioning needle. However, in actual operation, the craniotomy diameter of the existing craniotomy electric drill cannot be replaced. Moreover, in the actual craniotomy process, it is difficult to control the craniotomy depth. When the skull is drilled through, it is difficult to control and the internal brain tissue is easily damaged.

[0003] Therefore, how to provide a high-precision animal minimally invasive craniotomy electric drill that can adjust the diameter of the skull and easily control the craniotomy depth is a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0004] In view of this, the present invention provides an electric drill for minimally invasive craniotomy in animals, aiming to solve the above technical problems.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] An electric drill for minimally invasive craniotomy surgery on animals, comprising a rotary power drive unit, the rotary power drive unit is used to provide rotational power and is used to be held by a human hand; and further comprising: a rotating seat, an adjusting screw sleeve, a drill barrel, a positioning needle, a positioning sleeve, and a first depth monitoring component;

[0007] The rotating seat is a hollow stepped shaft with a top diameter larger than a bottom diameter; a plurality of annular mounting grooves are evenly arranged at the bottom of the rotating seat; a thread is provided in the middle of the rotating seat; and the top of the rotating seat is fixedly connected to the rotating power driving part;

[0008] The adjusting screw sleeve is threadedly connected to the outer wall of the rotating seat;

[0009] The drill tube is a cylinder with cutter teeth at the bottom, and the tops of the drill tubes of different sizes can be detachably plugged into the annular mounting grooves of the same size;

[0010] The top end of the positioning needle is connected to the rotating seat and coaxially passes through the axis of the rotating seat, and the bottom end of the positioning needle protrudes from the bottom end of the drill tube;

[0011] The positioning sleeve is sleeved on the rotating seat, and the top end is clamped with the bottom end of the adjusting screw sleeve;

[0012] There are multiple first depth monitoring components installed at the bottom end of the positioning sleeve. The first depth monitoring components can measure the craniotomy depth as the drill tube rotates on the skull.

[0013] Through the above technical scheme, the present invention provides a minimally invasive craniotomy electric drill which can adjust the craniotomy diameter and control the craniotomy depth. By arranging annular mounting grooves of different diameters at the bottom of the rotating seat and cooperating with drill tubes of different diameters, craniotomies of different sizes can be realized, and the disassembly and installation are simple and convenient; at the same time, when drilling, the drilling depth is monitored in real time in conjunction with the first depth monitoring component, and the drilling depth can be effectively controlled to prevent the problem of over-drilling. The operation is simple and convenient, and the craniotomy operation has high precision. It can be widely used in scientific research on drilling holes in the skulls of animals such as cattle, sheep, pigs, deer, elephants, tigers, lions, leopards, etc. to remove the pituitary gland and specific brain areas, and the treatment of head diseases such as the removal of brain hydatids, as well as catering industry personnel for opening the skulls of cattle, sheep, and pigs to remove brain flowers.

[0014] Preferably, in the above-mentioned electric drill for minimally invasive craniotomy in animals, the first depth monitoring component includes a measuring needle, a first spring and a first photoelectric displacement sensor; the measuring needle is slidably mounted in the first measuring hole axially opened at the bottom of the positioning sleeve, and protrudes out of the bottom of the positioning sleeve; the first spring is arranged in the first measuring hole, and the two ends are respectively fixedly connected to the measuring needle and the bottom of the first measuring hole; the first photoelectric displacement sensor is fixed to the side wall of the first measuring hole, and is used to measure the displacement of the measuring needle relative to the bottom of the first measuring hole. The present invention uses a photoelectric displacement sensor and a measuring needle to cooperate. When opening the skull, the measuring needle is fixed on the skull for positioning. When the drill barrel is drilled in, as the drill barrel goes deeper, the measuring needle compresses the first spring to move, and the photoelectric displacement sensor measures the displacement of the measuring needle, which is equivalent to the craniotomy depth of the drill barrel. The structure is simple and the measurement accuracy is high.

[0015] Preferably, in the above-mentioned electric drill for minimally invasive craniotomy surgery on animals, the number of the first depth monitoring components is 4, and they are evenly arranged in a ring at the bottom of the positioning sleeve. By setting up multiple photoelectric displacement sensors, the craniotomy depth can be accurately measured.

[0016] Preferably, in the above-mentioned electric drill for minimally invasive craniotomy of animals, a drill cutter is also included; the drill cutter includes a fixed tube and a blade; the fixed tube is a cylindrical structure, and the top end is detachably plugged into the annular mounting groove, and the positioning pin is located inside the fixed tube; the blade is a circular structure, and a side plane is fixedly connected to the bottom end of the fixed tube, and the diameter of the blade is greater than the diameter of the positioning sleeve. The present invention has functional diversity, and the drill tube is replaced with a drill cutter, and the entire skull can be opened, which is suitable for scientific research, or for taking animal brains for catering.

[0017] Preferably, in the above-mentioned electric drill for minimally invasive craniotomy surgery on animals, a second depth monitoring component is also included; the second depth monitoring component includes a measuring rod, a second spring and a second photoelectric displacement sensor; the measuring rod is a rod body with a roller at the end, the measuring rod is slidably installed in the second measuring hole horizontally opened on the side wall of the positioning sleeve, and the roller protrudes from the side wall of the positioning sleeve; the second spring is arranged in the second measuring hole, and the two ends are respectively fixedly connected to the measuring rod and the bottom of the second measuring hole; the second photoelectric displacement sensor is fixed to the side wall of the second measuring hole, and is used to measure the displacement of the measuring rod relative to the bottom of the second measuring hole. The present invention uses a photoelectric displacement sensor and a measuring rod to cooperate. When opening the skull, the measuring rod is positioned on the skull. When the blade is cutting, as the blade goes deeper, the measuring rod compresses the second spring to move, and the photoelectric displacement sensor measures the displacement of the measuring rod, which is equivalent to the cutting depth of the blade. The structure is simple and the measurement accuracy is high.

[0018] Preferably, in the above-mentioned electric drill for minimally invasive craniotomy surgery on animals, the end of the measuring rod is aligned with the edge of the blade, so as to improve the accuracy of cutting depth measurement.

[0019] Preferably, in the above-mentioned electric drill for minimally invasive craniotomy surgery on animals, a fixing pin is further included, and the fixing pin passes through the annular mounting groove from the outer wall of the rotating seat and is connected to the fixing cylinder. The connection of the fixing pin can improve the stability of the fixing cylinder during rotation.

[0020] Preferably, in the above-mentioned electric drill for minimally invasive craniotomy surgery on animals, a fixing pin is further included, and the fixing pin passes through the annular mounting groove from the outer wall of the rotating seat and is connected to the drill barrel. The connection of the fixing pin can improve the stability of the drill barrel during rotation.

[0021] Preferably, in the above-mentioned electric drill for minimally invasive craniotomy surgery on animals, the top of the rotating seat has a countersink, and the top of the positioning pin is located in the countersink. The spatial layout is reasonable and the connection is convenient.

[0022] Preferably, in the above-mentioned electric drill for minimally invasive craniotomy of animals, the positioning needle comprises a needle rod, a fixing head, a third spring and a bolt; the needle rod coaxially passes through the axis of the rotating seat; the fixing head is fixed to the top of the needle rod; the third spring is sleeved on the needle rod and is located between the fixing head and the bottom surface of the countersunk hole; the bolt passes through the fixing head and is threadedly connected to the bottom surface of the countersunk hole. This enables the positioning needle to achieve a good positioning and stabilizing effect.

[0023] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses an electric drill for minimally invasive craniotomy of animals, which has the following beneficial effects:

[0024] The present invention can realize craniotomy of different sizes by arranging annular installation grooves of different diameters at the bottom of the rotating seat and cooperating with drill tubes of different diameters. The sizes are usually selected between 1 and 5 cm, and the disassembly and installation are simple and convenient. At the same time, when drilling, the drilling depth is monitored in real time in cooperation with the first depth monitoring component, which can effectively control the drilling depth to prevent the problem of over-drilling. The operation is simple and convenient, and the craniotomy operation is high in precision. It can be widely used in scientific research on drilling holes in the skulls of cattle, sheep, pigs, deer, elephants, tigers, lions, leopards and other animals to remove the pituitary gland and specific brain areas and the treatment of head diseases such as the removal of brain hydatids.

[0025] The present invention has functional diversity and can adopt two modes of drill barrel rotation craniotomy and drill knife cutting craniotomy, and the switching is simple and convenient. The drill barrel rotation craniotomy can be widely used in scientific research on drilling holes in the skulls of animals such as cattle, sheep, pigs, deer, elephants, tigers, lions, leopards, etc. to remove the pituitary gland and specific brain areas and the treatment of head diseases such as removing brain hydatids; the drill knife cutting craniotomy can open the entire skull, which is suitable for scientific research, or for taking the brains of cattle, sheep, and pigs in catering.

[0026] The present invention cooperates with a photoelectric displacement sensor and a measuring needle or a measuring rod. When opening the skull, the measuring needle or the measuring rod is used to position the measuring needle or the measuring rod on the skull. When opening the skull, the measuring needle or the measuring rod compresses the second spring to move, and the photoelectric displacement sensor measures the displacement of the measuring needle or the measuring rod, which is equivalent to the cutting depth. The structure is simple and the measurement accuracy is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0028] Figure 1 The accompanying drawing is a schematic diagram of the structure of the drill pipe provided by the present invention;

[0029] Figure 2 The accompanying drawing is a schematic diagram of a half-section structure of a drill tube provided by the present invention;

[0030] Figure 3 The accompanying drawing is a schematic diagram of the structure of the drill provided by the present invention;

[0031] Figure 4 The accompanying drawing is a schematic diagram of a half-section structure using a drill provided by the present invention.

[0032] in:

[0033] Swivel seat;

[0034] Annular mounting groove;

[0035] Countersunk holes;

[0036] Adjusting screw sleeve;

[0037] Drill barrel;

[0038] Positioning needle;

[0039] Needle bar;

[0040] Fixed head;

[0041] The third spring;

[0042] bolt;

[0043] Positioning sleeve;

[0044] The first measuring hole;

[0045] The second measuring hole;

[0046] Threading hole

[0047] A first depth monitoring component;

[0048] Measuring needle;

[0049] First spring;

[0050] A first photoelectric displacement sensor;

[0051] Drilling tool;

[0052] Fixed cylinder;

[0053] blade;

[0054] A second depth monitoring component;

[0055] Measuring rod;

[0056] Second spring;

[0057] a second photoelectric displacement sensor;

[0058] Fixing pin. DETAILED DESCRIPTION

[0059] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0060] See attached Figure 1 To Attachment Figure 2 The embodiment of the present invention discloses an electric drill for minimally invasive craniotomy of animals, including a rotary power driving unit, which is used to provide rotational power and is used to be held by a human hand; and further includes: a rotating seat 1, an adjusting screw sleeve 2, a drill barrel 3, a positioning needle 4, a positioning sleeve 5, and a first depth monitoring component 6;

[0061] The rotating seat 1 is a hollow stepped shaft with a top diameter larger than a bottom diameter; a plurality of annular mounting grooves 11 are evenly arranged at the bottom of the rotating seat 1; a thread is provided in the middle of the rotating seat 1; and the top of the rotating seat 1 is fixedly connected to the rotating power driving part;

[0062] The adjusting screw sleeve 2 is threadedly connected to the outer wall of the rotating seat 1;

[0063] The drill tube 3 is a cylinder with cutter teeth at the bottom, and the tops of drill tubes 3 of different sizes can be detachably plugged into an annular mounting groove 11 of the same size as the tops of drill tubes 3;

[0064] The top end of the positioning needle 4 is connected to the rotating seat 1 and coaxially passes through the axis of the rotating seat 1, and the bottom end of the positioning needle 4 protrudes from the bottom end of the drill tube 3;

[0065] The positioning sleeve 5 is sleeved on the rotating seat 1, and the top end is clamped with the bottom end of the adjusting screw sleeve 2;

[0066] There are multiple first depth monitoring components 6 installed at the bottom end of the positioning sleeve 5. The first depth monitoring components 6 can measure the craniotomy depth as the drill tube 3 rotates on the skull.

[0067] In order to further optimize the above technical solution, the first depth monitoring component 6 includes a measuring needle 61, a first spring 62 and a first photoelectric displacement sensor 63; the measuring needle 61 is slidably installed in the first measuring hole 51 axially opened at the bottom of the positioning sleeve 5, and protrudes out of the bottom of the positioning sleeve 5; the first spring 62 is arranged in the first measuring hole 51, and its two ends are respectively fixedly connected to the measuring needle 61 and the bottom of the first measuring hole 51; the first photoelectric displacement sensor 63 is fixed on the side wall of the first measuring hole 51, and is used to measure the displacement of the measuring needle 61 relative to the bottom of the first measuring hole 51.

[0068] In order to further optimize the above technical solution, the number of the first depth monitoring components 6 is four, and they are evenly arranged in a ring shape at the bottom of the positioning sleeve 5 .

[0069] In order to further optimize the above technical solution, a fixing pin 9 is also included. The fixing pin 9 passes through the annular mounting groove 11 from the outer wall of the rotating seat 1 and is connected to the drill tube 3.

[0070] In order to further optimize the above technical solution, a countersunk hole 12 is provided on the top of the rotating seat 1 , and the top end of the positioning pin 4 is located in the countersunk hole 12 .

[0071] In order to further optimize the above technical solution, the positioning needle 4 includes a needle rod 41, a fixed head 42, a third spring 43 and a bolt 44; the needle rod 41 coaxially passes through the axis of the rotating seat 1; the fixed head 42 is fixed to the top of the needle rod 41; the third spring 43 is sleeved on the needle rod 41 and is located between the fixed head 42 and the bottom surface of the countersunk hole 12; the bolt 44 passes through the fixed head 42 and is threadedly connected to the bottom surface of the countersunk hole 12.

[0072] In order to further optimize the above technical solution, the positioning sleeve 5 is provided with a threading hole 53 for the connecting wires of the first photoelectric displacement sensor 63 to pass through.

[0073] The working principle of this embodiment is:

[0074] The positioning needle 4 is pressed against the skull position where craniotomy is required, and the measuring needle 61 on the positioning sleeve 5 is pressed against the skull; the rotary power driving part is driven to drive the rotating seat 1 to rotate, and the drill tube 3 rotates to open the skull. As the drill tube 3 gradually penetrates into the skull, the measuring needle 61 compresses the first spring 62, and the first photoelectric displacement sensor 63 measures the displacement of the measuring needle 61, that is, the drilling depth of the drill tube 3 is obtained, thereby realizing real-time monitoring of the craniotomy depth of the drill tube 3.

[0075] When a craniotomy of a different size is required, the fixing pin 9 is removed, the drill tube 3 of a different size is disassembled and replaced, and the fixing pin 9 is reinserted to complete the replacement.

[0076] The appropriate control voltage for driving the rotary power drive unit can be controlled by a transformer and adjusted after being connected to a computer. Example

[0077] See attached Figure 3 To Attachment Figure 4 In the embodiment of the present invention, the drill tube 3 is disassembled and the following structure is added on the basis of the embodiment 1:

[0078] It also includes a drill 7; the drill 7 includes a fixed tube 71 and a blade 72; the fixed tube 71 is a cylindrical structure, and the top end is detachably connected to the annular mounting groove 11, and the positioning pin 4 is located inside the fixed tube 71; the blade 72 is a circular structure, and a side plane is fixedly connected to the bottom end of the fixed tube 71, and the diameter of the blade 72 is larger than the diameter of the positioning sleeve 5.

[0079] In order to further optimize the above technical solution, it also includes a second depth monitoring component 8; the second depth monitoring component 8 includes a measuring rod 81, a second spring 82 and a second photoelectric displacement sensor 83; the measuring rod 81 is a rod body with a roller at the end, and the measuring rod 81 is slidably installed in the second measuring hole 52 horizontally opened on the side wall of the positioning sleeve 5, and the roller protrudes from the side wall of the positioning sleeve 5; the second spring 82 is arranged in the second measuring hole 52, and the two ends are fixedly connected to the measuring rod 81 and the bottom of the second measuring hole 52 respectively; the second photoelectric displacement sensor 83 is fixed to the side wall of the second measuring hole 52, and is used to measure the displacement of the measuring rod 81 relative to the bottom of the second measuring hole 52.

[0080] In order to further optimize the above technical solution, the end of the measuring rod 81 is aligned with the edge of the blade 72 .

[0081] In order to further optimize the above technical solution, a fixing pin 9 is also included. The fixing pin 9 passes through the annular mounting groove 11 from the outer wall of the rotating seat 1 and is connected to the fixing cylinder 71.

[0082] In order to further optimize the above technical solution, a threading hole 53 is provided on the positioning sleeve 5 for the connecting wire of the second photoelectric displacement sensor 83 to pass through.

[0083] The working principle of this embodiment is:

[0084] Remove the fixing pin 9, disassemble the drill tube 3, insert the fixing tube 71 into the annular mounting groove 11, and insert the fixing pin 9 again to complete the replacement.

[0085] The roller of the measuring rod 81 on the positioning sleeve 5 is pressed against the skull; the rotating power drive unit is driven to drive the rotating seat 1 to rotate, and the blade 72 rotates to open the skull. As the blade 72 gradually penetrates into the skull, the measuring rod 81 compresses the second spring 82, and the second photoelectric displacement sensor 83 measures the displacement of the measuring rod 81, that is, the cutting depth of the blade 72 is obtained, thereby realizing real-time monitoring of the cutting depth of the blade 72.

[0086] The appropriate control voltage for driving the rotary power drive unit can be controlled by a transformer and adjusted after being connected to a computer.

[0087] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0088] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An electric drill for minimally invasive craniotomy of animals, comprising a rotary power drive unit, the rotary power drive unit is used to provide rotational power and is used to be held by a human hand; characterized in that: Also includes: A rotating seat (1), an adjusting screw sleeve (2), a drill tube (3), a positioning pin (4), a positioning sleeve (5), and a first depth monitoring component (6); The rotating seat (1) is a hollow stepped shaft with a top diameter larger than a bottom diameter; a plurality of annular mounting grooves (11) are evenly arranged at the bottom of the rotating seat (1); a thread is provided at the middle of the rotating seat (1); and the top of the rotating seat (1) is fixedly connected to the rotating power driving unit; The adjusting screw sleeve (2) is threadedly connected to the outer wall of the rotating seat (1); The drill tube (3) is a cylinder having teeth at the bottom, and the tops of drill tubes (3) of different sizes and the annular mounting groove (11) of the same size can be detachably plugged in. The top end of the positioning needle (4) is connected to the rotating seat (1) and coaxially passes through the axis of the rotating seat (1), and the bottom end of the positioning needle (4) protrudes from the bottom end of the drill tube (3); The positioning sleeve (5) is sleeved on the rotating seat (1), and the top end is clamped with the bottom end of the adjusting screw sleeve (2); The first depth monitoring components (6) are multiple in number and are installed at the bottom end of the positioning sleeve (5), and the first depth monitoring components (6) are capable of measuring the craniotomy depth as the drill tube (3) rotates on the skull; It also includes a fixing pin (9), wherein the fixing pin (9) passes through the annular mounting groove (11) from the outer wall of the rotating seat (1) and is connected to the drill tube (3); The top of the rotating seat (1) is provided with a countersunk hole (12), and the top end of the positioning pin (4) is located in the countersunk hole (12).

2. The electric drill for minimally invasive craniotomy of animals according to claim 1, characterized in that: The first depth monitoring component (6) comprises a measuring needle (61), a first spring (62) and a first photoelectric displacement sensor (63); the measuring needle (61) is slidably mounted in a first measuring hole (51) axially opened at the bottom of the positioning sleeve (5) and protrudes from the bottom of the positioning sleeve (5); the first spring (62) is arranged in the first measuring hole (51), and two ends thereof are respectively fixedly connected to the measuring needle (61) and the bottom of the first measuring hole (51); the first photoelectric displacement sensor (63) is fixed to the side wall of the first measuring hole (51) and is used to measure the displacement of the measuring needle (61) relative to the bottom of the first measuring hole (51).

3. The electric drill for minimally invasive craniotomy of animals according to claim 2, characterized in that: The number of the first depth monitoring components (6) is four, and they are evenly arranged in a ring shape at the bottom of the positioning sleeve (5).

4. An electric drill for minimally invasive craniotomy of animals according to any one of claims 1 to 3, characterized in that: It also includes a drill (7); the drill (7) includes a fixed tube (71) and a blade (72); the fixed tube (71) is a cylindrical structure, and the top end is detachably plugged into the annular mounting groove (11), and the positioning pin (4) is located inside the fixed tube (71); the blade (72) is a circular structure, and a side plane is fixedly connected to the bottom end of the fixed tube (71), and the diameter of the blade (72) is greater than the diameter of the positioning sleeve (5).

5. The electric drill for minimally invasive craniotomy surgery for animals according to claim 4, characterized in that: The invention also comprises a second depth monitoring assembly (8); the second depth monitoring assembly (8) comprises a measuring rod (81), a second spring (82) and a second photoelectric displacement sensor (83); the measuring rod (81) is a rod body having a roller at the end thereof, the measuring rod (81) being slidably mounted in a second measuring hole (52) horizontally opened in the side wall of the positioning sleeve (5), and the roller protruding from the side wall of the positioning sleeve (5); the second spring (82) is arranged in the second measuring hole (52), and its two ends are respectively fixedly connected to the measuring rod (81) and the bottom of the second measuring hole (52); the second photoelectric displacement sensor (83) is fixed to the side wall of the second measuring hole (52), and is used to measure the displacement of the measuring rod (81) relative to the bottom of the second measuring hole (52).

6. The electric drill for minimally invasive craniotomy surgery for animals according to claim 5, characterized in that: The end of the measuring rod (81) is aligned with the edge of the blade (72).

7. The electric drill for minimally invasive craniotomy surgery for animals according to claim 4, characterized in that: It also includes a fixing pin (9), wherein the fixing pin (9) passes through the annular mounting groove (11) from the outer wall of the rotating seat (1) and is connected to the fixing cylinder (71).

8. The electric drill for minimally invasive craniotomy surgery for animals according to claim 1, characterized in that: The positioning needle (4) comprises a needle rod (41), a fixing head (42), a third spring (43) and a bolt (44); the needle rod (41) coaxially passes through the axis of the rotating seat (1); the fixing head (42) is fixed to the top of the needle rod (41); the third spring (43) is sleeved on the needle rod (41) and is located between the fixing head (42) and the bottom surface of the countersunk hole (12); the bolt (44) passes through the fixing head (42) and is threadedly connected to the bottom surface of the countersunk hole (12).

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