Skull cutting device

Abstract

The present invention provides a skull cutting device, which solves the technical problem that the use of existing tools brings great inconvenience and unsafe factors to forensic dissection work, and is difficult to ensure timeliness when the cause of death of the deceased needs to be quickly determined. The device can be widely used in the field of cutting equipment; specifically, it includes a transmission shaft, which is rotatably connected to a boom base through a bearing, and a plurality of upper booms are provided on the boom base, each of the upper booms is hinged with a lower boom, and a tension spring is provided between the lower boom and the upper boom, and the tension spring is used to provide an inward contraction tension for the lower boom, and the tension of the tension spring is greater than the maximum centrifugal force to which the lower boom is subjected during rotation, and a cutting blade is also provided on the lower boom, and a shield is fixedly connected to the outer ring of the bearing; a fixing part is provided on the shield; the upper boom is hinged to the boom base, and a limit block is also provided on the upper boom.

Description

Technical Field

[0001] The invention belongs to the technical field of cutting equipment, and in particular relates to a skull cutting device. Background Art

[0002] In the prior art, when it is necessary to cut spherical shells, there is no more convenient cutting equipment. For example, when a forensic doctor performs an autopsy, it is often necessary to perform a craniotomy on the body of the deceased, and traditional craniotomy tools must be held by hand, which can easily cause the inability to cut vertically and horizontally, and the cutting process is prone to slipping and inaccurate cutting depth. The entire process of cutting with traditional electric tools requires real-time manual control and adjustment, which is inconvenient to operate and can easily cause secondary injuries to the subject and the operator. Cutting with traditional manual tools can ensure its accuracy, but the process is more complicated. The use of the above two tools brings great inconvenience and unsafe factors to the forensic doctor's dissection work, and it is difficult to guarantee timeliness when the cause of death of the deceased needs to be quickly determined. In order to reduce the burden on forensic doctors and reduce time costs, it is necessary to invent a skull top cutting device that is easy to use. Summary of the Invention

[0003] The purpose of the present invention is to provide a skull cutting device in order to solve the deficiencies of the above-mentioned technology.

[0004] To this end, the present invention provides a skull cutting device, including a transmission shaft, which is rotatably connected to a boom base via a bearing, and a plurality of upper booms are provided on the boom base, each of which is hinged with a lower boom, and a tension spring is provided between the lower boom and the upper boom, and the tension spring is used to provide an inward contraction pulling force for the lower boom, and the tension of the tension spring is greater than the maximum centrifugal force applied to the lower boom during rotation, and a cutting blade is also provided on the lower boom.

[0005] Furthermore, the outer ring of the bearing is fixedly connected with a shield.

[0006] Furthermore, a fixing piece is provided on the shield.

[0007] Furthermore, the upper boom is hinged to the boom base, the upper boom is further provided with a limit block, and the inner wall of the shield is provided with a sliding groove that matches the limit block.

[0008] Furthermore, a torsion spring is sleeved on the hinge shaft between the upper boom and the boom base, and the torsion spring is used to provide tension for the upper boom to expand outward.

[0009] Furthermore, the protective cover is made of transparent material.

[0010] Furthermore, when the two opposite lower suspension arms are at rest, the distance between the ends of the two cutting blades is equal to the minimum inner diameter of the skull.

[0011] Furthermore, the side walls of the limiting block and the sliding groove are both arc-shaped.

[0012] Furthermore, the fixing member includes a screw and a bolt, and a gasket is provided at the end of the screw.

[0013] The present invention provides a skull cutting device, which has the following beneficial effects:

[0014] A double-layer nested cutting tool wraps the selected area of ​​the patient's head, ensuring a snug fit. Externally connected electric drive equipment then performs concentric staggered rotation to achieve precise, flat cutting. During the cutting process, a visual window allows for observation and inspection, assessing the progress and completion of the cutting process. This directly impacts the safety and effectiveness of the cutting process, the integrity of the cut area, and any damage to the internal tissue being inspected, ultimately impacting the accuracy of subsequent test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the exterior of the present invention;

[0016] Figure 2 It is an internal structure diagram of the present invention;

[0017] Figure 3 is an internal elevation view of the present invention;

[0018] Figure 4 is a schematic diagram of the dimensions of the lower boom of the present invention in an expanded state;

[0019] Markings in the figure: 1. Drive shaft; 2. Bearing; 3. Boom base; 4. Torsion spring; 5. Upper boom; 6. Lower boom; 7. Tension spring; 8. Guard; 9. Cutting blade; 10. Fixing; 11. Fixing column; 12. Limit block; 13. Slide; 14. Bolt; 15. Screw; 16. Skull. DETAILED DESCRIPTION

[0020] The present invention is further described below with reference to the accompanying drawings and specific examples to facilitate understanding of the present invention. The methods used in the present invention are conventional methods unless otherwise specified; the raw materials and devices used are conventional commercially available products unless otherwise specified.

[0021] like Figure 1-3As shown, the present invention provides a skull cutting device, comprising a shield 8, which is a hemispherical shell with a through hole in the center. A bearing 2 is disposed within the through hole, and a transmission shaft 1 is disposed within the bearing 2. A boom base 3 is fixedly connected below the transmission shaft 1. The transmission shaft 1 is a triangular prism. The boom base 3 has a slot that mates with the transmission shaft 1, and transmission is achieved through the engagement of the slot and the transmission shaft 1. The boom base 3 is cross-shaped and hinged with four upper booms 5. Each hinge shaft is fitted with a torsion spring 4, which provides outward tension to the upper booms 5. Each upper boom 5 is hinged to a lower boom 6 at its other end. A fixing post 11 is disposed on the side wall of each upper boom 5 and each lower boom 6 near the center of the shield 8. Tension springs 7 are mounted on the two fixing posts 11. The tension springs 7 provide an inward tension force to the lower boom 6, which is greater than the maximum centrifugal force during rotation. A cutting blade 9 is fixedly connected to the bottom end of the lower boom 6. In some embodiments, the cutting blade 9 is a grinding wheel or a saw gear.

[0022] Each upper arm 5 is fixedly connected to a limit block 12 on the side wall near the shield 8, and a slide groove 13 is provided on the inner wall of the shield 8 to match the limit block 12. The upper arm 5 and the lower arm 6 are both arc-shaped, which can better fit the shape of the skull.

[0023] The bottom of the shield 8 is provided with a plurality of fixing members 10, each of which comprises a bolt 14 and a fixing screw 15. The ends of the bolts 14 may also be provided with washers (not shown) to increase the contact area with the skull and make the shield 8 more stable.

[0024] During use, the lower arm 6 is expanded outward to wrap the shield 8 around the skull. The lower arm 6, under the action of the tension spring 7, clamps the skull. The screw 15 is then tightened to secure the shield 8 around the skull. The drive shaft 1 is then connected to the drive motor, allowing the drive motor to rotate the arm base 3 via the drive shaft 1, thereby rotating the upper arm 5 and lower arm 6. As the upper arm 5 rotates, the limit block 12 is blocked by the chute 13, offsetting the centrifugal force exerted on the upper arm 5 and the elastic force of the torsion spring 4. This prevents the upper arm 5 from further expanding outward, and the upper arm 5 remains in position. However, because the tension provided by the tension spring 7 on the lower arm 6 is greater than the centrifugal force during rotation, the cutting blade 9 is constantly subjected to an inward contraction force. Furthermore, the cutting blade 9 continuously rotates and cuts the skull 16 until the skull 16 is severed.

[0025] like Figure 4 As shown, in order to prevent the cutting blade 9 from moving toward the center of the sphere of the shield 8 after cutting the skull 16 and damaging the brain tissue, when the two relative lower suspension arms 6 are stationary, the distance D between the ends of the two cutting blades 9 is equal to the minimum inner diameter L of the skull 16.

[0026] It should be noted that, because the human skull 16 has an irregular structure, the cutting cross-section formed is also an irregular figure, but the movement path of the cutting blade 9 is a circle. Therefore, when selecting the cutting position, it is necessary to simulate and draw the cutting cross-section in advance by means of X-ray or other means, and try to select a cutting cross-section that is close to a circle. In the figure formed by the cutting cross-section, the inscribed circle with the maximum diameter tangent to the inner diameter of the skull 16 is calculated, that is, the maximum diameter of the inscribed circle is equal to the minimum inner diameter L of the skull 16. As described above, in the process of cutting skulls 16 of different sizes, after calculating the minimum inner diameter L of the skull 16, it is necessary to replace the tension spring 7 with a different elastic coefficient to ensure that the distance D between the ends of the two opposite cutting blades 9 is equal to the minimum inner diameter L of the skull 16.

[0027] The side walls of the limit block 12 and the chute 13 are both arc-shaped, so when the interior of the device is disassembled and cleaned, the upper hanging arm 5 can be rotated inward and retracted to make it easier to remove the limit block 12 from the chute 13.

[0028] The shield 8 is made of a transparent material, which makes it easy to observe the cutting progress. In one embodiment, the shield 8 is made of acrylic material.

[0029] In the description of the present invention, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inside", "outside", "back", "middle", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] However, the above description is merely a specific embodiment of the present invention and should not be used to limit the scope of implementation of the present invention. Therefore, the replacement of equivalent components, or equivalent changes and modifications made according to the scope of protection of the present invention should still fall within the scope covered by the claims of the present invention.

Claims

1. A skull cutting device, characterized in that: The invention comprises a transmission shaft, the transmission shaft being rotatably connected to a boom base via a bearing, the boom base being provided with a plurality of upper booms, each of the upper booms being hingedly connected to a lower boom, a tension spring being provided between the lower booms and the upper booms, the tension spring being used to provide an inward contracting force for the lower booms, the tension of the tension spring being greater than the maximum centrifugal force to which the lower booms are subjected during rotation, and a cutting blade being further provided on the lower booms; when the two opposing lower booms are at rest, the distance between the ends of the two cutting blades is equal to the minimum inner diameter of the skull; The transmission shaft rotates in coordination with the output shaft of the motor, driving the boom base to rotate synchronously, so that the cutting blade performs horizontal circular cutting on the top of the skull when it is upright; the upper boom is hinged to the boom base, and the upper boom is also provided with a limit block, and a slide groove that cooperates with the limit block is provided on the inner wall of the shield; a torsion spring is sleeved on the hinge shaft of the upper boom and the boom base, and the torsion spring is used to provide tension for the upper boom to expand outward.

2. A skull cutting device according to claim 1, characterized in that: The outer ring of the bearing is fixedly connected with a shield.

3. A skull cutting device according to claim 2, characterized in that: A fixing piece is provided on the shield.

4. A skull cutting device according to claim 2, characterized in that: The protective cover is made of transparent material.

5. The skull cutting device according to claim 1, characterized in that: The side walls of the limiting block and the sliding groove are both arc-shaped.

6. The skull cutting device according to claim 3, characterized in that: The fixing member includes a screw and a bolt, and a gasket is further provided at the end of the screw.

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