Vertical CBCT (cone beam computed tomography) imaging equipment

Abstract

The utility model discloses a vertical CBCT imaging device which comprises a CT device and a dental chair device, an interlocking module is installed in the dental chair device, the interlocking module is connected with the CT device, the CT device comprises a C-shaped arm, a supporting stand column and a base, a moving module is fixedly installed at the top end of the base, the top end of the moving module is connected with the bottom end of the supporting stand column, and the top end of the moving module is connected with the bottom end of the supporting stand column. A hollow rotating platform is installed on one side of the supporting stand column, one side of the hollow rotating platform is connected with a C-shaped arm, the dental chair device comprises a base and a lifting stand column, sliding rails are fixedly installed on the two sides of the inner wall of the base, and the top end of a movable block is fixedly connected with the bottom end of the lifting stand column. The dental chair equipment and the CT equipment are arranged and assembled through the interlocking module, a room is not replaced after CT is shot, diagnosis and treatment are directly carried out on a scanning chair, the treatment time is saved, and meanwhile the space utilization rate is increased.

Description

Technical Field

[0001] This utility model relates to the field of X-ray imaging, specifically a vertical CBCT imaging device. Background Technology

[0002] With the continuous advancement and innovation of medical technology, the demand for advanced imaging equipment in the dental field is showing an increasing trend. In the dental diagnosis process, accurate imaging data plays a crucial role in enabling dentists to accurately assess the condition and formulate scientifically sound treatment plans. CBCT (cone-beam computed tomography) equipment, with its advantages such as high resolution and multi-angle imaging, has become an indispensable tool in dental diagnosis and is widely used in clinical practice.

[0003] Traditional CBCT equipment employs a suspended structure design. This structure is characterized by a high center of gravity, requiring it to be mounted on a sturdy wall to ensure stability during operation. This not only places high demands on the installation environment but also presents certain limitations in practical use. For example, the installation process is relatively complex, requires professional personnel, and once the installation location is determined, subsequent adjustments are difficult.

[0004] Our previous generation of equipment was a floor-standing structure. Compared to suspended structures, floor-standing CBCT equipment has a lower center of gravity, which makes the equipment more stable after installation. Even under certain external forces, it is less prone to tipping over or other safety accidents. However, both the traditional suspended structure and the previous generation of floor-standing CBCT equipment share a common problem: their large overall size. This large size not only occupies more space but also causes great inconvenience during transportation. For example, when the equipment is repaired, upgraded, or moved, its large size often requires specialized handling equipment and tools, consuming a lot of manpower, resources, and time.

[0005] At the same time, these devices place relatively high demands on patients. Patients must stand or sit during the examination. This is undoubtedly a huge challenge for patients with limited mobility. For example, some patients with severe leg problems, fractures, or who are elderly and frail may not be able to stand or remain seated for extended periods, making CBCT examinations extremely difficult for them.

[0006] Furthermore, existing dental CBCT equipment presents numerous inconveniences during use. Patients must move between locations during treatment. CT scans must be performed in a dedicated lead-lined room to prevent radiation hazards to the surrounding environment and personnel. Treatment sessions require travel to the treatment room, and doctor's office is needed for communication. This workflow not only causes significant inconvenience for patients but also impacts treatment efficiency. The transfers between locations waste time and may increase fatigue and anxiety. For patients with more severe conditions, frequent movement can pose risks. Moreover, this fragmented imaging and treatment model also complicates the work of medical staff, increasing its complexity and difficulty.

[0007] In conclusion, the structure and imaging modes of dental CBCT equipment do indeed urgently need improvement. Only through continuous innovation and optimization can we meet the growing demands of dental treatment and provide patients with more convenient, efficient, and safe medical services. Utility Model Content

[0008] The purpose of this invention is to provide a vertical CBCT imaging device to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, this utility model provides the following technical solution: It includes an imaging device, comprising a CT scanner and a dental chair. The dental chair has an interlocking module installed inside, connected to the CT scanner. The CT scanner includes a C-arm, a support column, and a base. A movable module is fixedly installed at the top of the base, and the top of the movable module is connected to the bottom of the support column. A hollow rotating platform is installed on one side of the support column, and the C-arm is connected to one side of the hollow rotating platform. The dental chair includes a base and a lifting column. Slide rails are fixedly installed on both sides of the inner wall of the base. A movable block is slidably connected between the two slide rails. The top of the movable block is fixedly connected to the bottom of the lifting column. A seat cushion structure is fixedly installed at the movable end of the lifting column. A backrest structure is rotatably connected to one side of the seat cushion structure, and a headrest structure is connected to one side of the backrest structure.

[0010] As a further embodiment of this utility model: the C-arm is equipped with an X-ray emitting device and a receiving device.

[0011] As a further embodiment of this utility model: the hollow rotating platform includes a motor and a reducer. The output end of the first motor is fixedly connected to one end of the reducer. An installation shaft is fixedly installed on the output end of the reducer. One end of the installation shaft is fixedly connected to the C-arm. An encoder is fixedly installed on the surface of the motor. One side of the motor is fixedly connected to the side of the support column opposite to it.

[0012] As a further embodiment of this utility model: the moving module includes two limiting plates and a lead screw. The opposite sides of the two limiting plates are rotatably connected to both ends of the lead screw. A second motor for driving the lead screw to rotate is fixedly installed on the surface of one of the limiting plates. Guide rails are provided on both sides of the lead screw. A slider that is slidably connected to the two guide rails is threaded to the middle of the lead screw. The top end of the slider is fixedly connected to the supporting column. The bottom ends of the two limiting plates and the bottom ends of the two guide rails are fixedly connected to the base.

[0013] As a further embodiment of this utility model: a cylinder is installed inside the base, and the movable end of the cylinder is connected to the side of the movable block that is directly opposite it.

[0014] As a further embodiment of this utility model: the headrest structure includes a headrest body and two locking posts. The two ends of one side of the headrest body are respectively fixedly connected to one end of the two locking posts. Both locking posts are engaged with the backrest structure. The backrest structure includes a fixed backrest and a telescopic backrest. One end of the fixed backrest is connected to the fixed end of the telescopic backrest. The movable end of the telescopic backrest is connected to the headrest structure. The other end of the fixed backrest is connected to the seat cushion structure.

[0015] As a further embodiment of this utility model, the interior of the cushion structure is connected to an interlocking module.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] By setting up dental chair equipment and CT equipment, which are assembled through interlocking modules, diagnosis and treatment can be performed directly on the scanning chair after a CT scan without changing rooms, saving treatment time and increasing space utilization. Attached Figure Description

[0018] Figure 1 This is a 3D view of a vertical CBCT imaging device.

[0019] Figure 2 This is a side view of a vertical CBCT imaging device.

[0020] Figure 3 This is a three-dimensional view of the dental chair in a vertical CBCT imaging system.

[0021] Figure 4A three-dimensional view of the headrest structure in a vertical CBCT imaging device;

[0022] Figure 5 A three-dimensional view of the central control rotating platform in a vertical CBCT imaging device;

[0023] Figure 6 This is a side view of the moving module in a vertical CBCT imaging device.

[0024] In the diagram: 1. CT equipment; 11. C-arm; 111. X-ray emitter; 112. Receiver; 12. Support column; 13. Base; 14. Central control rotating platform; 141. First motor; 142. Encoder; 143. Reducer; 144. Mounting shaft; 15. Moving module; 151. Guide rail; 152. Limit plate; 153. Lead screw; 154. Slider; 155. Second motor; 2. Dental chair equipment; 21. Base; 22. Slide rail; 23. Lifting column; 24. Seat cushion structure; 25. Backrest structure; 251. Fixed backrest; 252. Telescopic backrest; 26. Headrest structure; 261. Headrest body; 262. Locking column; 27. Movable block; 28. Cylinder; 3. Interlocking module. Detailed Implementation

[0025] The technical solution of this patent will be further described in detail below with reference to specific embodiments.

[0026] Please see Figure 1-6The system includes imaging equipment, specifically a CT scanner 1 and a dental chair 2. The dental chair 2 has an interlock module 3 installed inside, which is connected to the CT scanner 1. The CT scanner 1 includes a C-arm 11, a support column 12, and a base 13. A movable module 15 is fixedly installed at the top of the base 13, and the top of the movable module 15 is connected to the bottom of the support column 12. A hollow rotating platform 14 is installed on one side of the support column 12, and the C-arm 11 is connected to one side of the hollow rotating platform 14. The dental chair 2 includes a base 21 and a lifting column 23. Both sides of the inner wall of seat 21 are fixedly installed with slide rails 22, and a movable block 27 is slidably connected between the two slide rails 22. The top of the movable block 27 is fixedly connected to the bottom of the lifting column 23. A seat cushion structure 24 is fixedly installed on the movable end of the lifting column 23. A backrest structure 25 is rotatably connected to one side of the seat cushion structure 24, and a headrest structure 26 is connected to one side of the backrest structure 25. The base 13 is the basic component of CT equipment 1, used to support the column 12 and C-arm 11. It is made of heavy materials such as steel and cast iron, and has good stability and load-bearing capacity. The shape and size of the base 13 are determined according to the design requirements of the CT equipment 1, and it is rectangular or square. Its height and area parameters are reasonably designed according to factors such as the stability of the CT equipment 1 and the operating space. To ensure the stability of the CT equipment 1 during operation, the base 13 is reinforced with reinforcing ribs, anchor bolts and other structures. The reinforcing ribs can increase the strength and rigidity of the base, and the anchor bolts can fix the base to the ground to prevent the equipment from shaking during operation. The design of the base 13 also considers the operating space. Its height and area parameters are reasonably designed according to factors such as the height and operating habits of the operator to ensure that the operator can operate in a comfortable operating space. The support column 12 is the supporting structure of the C-arm 11, providing stable support for the C-arm 11. It is made of high-strength materials, such as steel and aluminum alloy, and has good rigidity and stability. The shape and size of the support column 12 are determined according to the design requirements of the CT equipment 1, and it is cylindrical or square. Its height and diameter parameters are reasonably designed according to factors such as the scanning range of the C-arm 11 and the body size of the patient.

[0027] The C-arm 11 contains an X-ray emitting device 111 and a receiving device 112. The X-ray emitting device 111 generates an X-ray beam to scan the patient. It consists of an X-ray tube, a high-voltage generator, and a cooling system. The X-ray tube emits electrons by heating the cathode. The electrons are accelerated under the action of a high-voltage electric field and strike the anode target surface, thereby generating X-rays. The performance of the X-ray tube directly affects the imaging quality and radiation dose of the CT equipment 1. The high-voltage generator provides a high voltage to the X-ray tube, accelerating the electrons to sufficient energy to generate X-rays. Its stability and accuracy play an important role in the intensity and quality of the X-rays. The cooling system is used to dissipate the heat generated by the X-ray tube to ensure that the X-ray tube can work normally. Cooling is achieved through air or water cooling to prevent the X-ray tube from overheating during operation. The receiving device 112 receives the attenuated X-rays from the patient's body and converts them into electrical signals. It consists of a detector, a data acquisition system, and a signal processing circuit. The detector converts the X-rays into electrical signals. Detector types include scintillation detectors, gas detectors, and semiconductor detectors. Different types of detectors have different performance characteristics, such as sensitivity, resolution, and noise level. The data acquisition system is responsible for acquiring the electrical signals output by the detector and transmitting them to the signal processing circuit for processing. Its speed and accuracy have a significant impact on the imaging speed and quality of the CT equipment 1. The signal processing circuit amplifies, filters, and digitizes the acquired electrical signals, and then transmits the processed signals to the computer for image reconstruction.

[0028] The hollow rotating platform 14 includes a motor 141 and a reducer 143. The output end of the first motor 141 is fixedly connected to one end of the reducer 143. A mounting shaft 144 is fixedly installed on the output end of the reducer 143. One end of the mounting shaft 144 is fixedly connected to the C-arm 11. An encoder 142 is fixedly installed on the surface of the motor 141. One side of the motor 141 is fixedly connected to the side of the support column 12 opposite to it. The central control rotating platform 14 is a key component connecting the C-arm 11 and the support column 12, enabling the rotational movement of the C-arm 11. It consists of a first motor 141, a reducer 143, an encoder 142, and a control system. Motor 141 provides power to the central control rotating platform 14, enabling the C-arm 11 to rotate around the supporting column 12. The type of motor 141 includes DC motors, AC motors, and stepper motors, each with different performance characteristics such as speed, torque, and precision. Reducer 143 is used to reduce the motor speed and increase the output torque, allowing the C-arm 11 to rotate smoothly. Reducer 143 can be a gear reducer, planetary reducer, or worm gear reducer, each with different reduction ratios and precision. Encoder 142 measures the rotation angle of the C-arm 11, providing feedback signals to the control system. Encoder 142 can be an absolute encoder or an incremental encoder, each with different resolutions and precision. The control system, employing a microprocessor, controls the motor's speed and direction to achieve precise rotation of the C-arm 11.

[0029] The moving module 15 includes two limiting plates 152 and a lead screw 153. The opposite sides of the two limiting plates 152 are rotatably connected to both ends of the lead screw 153. A second motor 155, which drives the lead screw 153, is fixedly mounted on the surface of one of the limiting plates 152. Guide rails 151 are provided on both sides of the lead screw 153. A slider 154, which is slidably connected to the two guide rails 151, is threadedly connected to the middle of the lead screw 153. The top of the slider 154 is fixedly connected to the support column 12. The bottom ends of the two limiting plates 152 and the bottom ends of the two guide rails 151 are fixedly connected to the base 13. The moving module 15 is a structure 13 connecting the support column 12 and the base, realizing the translational movement of the support column 12. It consists of a second motor 155, guide rails 151, slider 154, and a control system. 5. Power is provided to the moving module, enabling the support column to translate on the base. Motor types include DC motors, AC motors, and stepper motors, each with different performance characteristics such as speed, torque, and precision. Guide rails 151 and sliders 154 guide the translational movement of the support column, ensuring smooth movement. Guide rails 151 and sliders 154 can be linear guides, ball screws, or sliding guides, each with different precision and load-bearing capacity. Appropriate selection is made based on the design requirements of the dental chair equipment. The control system controls the motor's speed and direction to achieve precise translation of the support column. A microprocessor or programmable logic controller (PLC) is used as the core controller, and motor control is achieved through programming.

[0030] A cylinder 28 is installed inside the base 21. The movable end of the cylinder 28 is connected to the side of the movable block 27 opposite to it. The cylinder 28 performs telescopic transport, pushing the movable block 27 along the slide rail 22 from one side to adjust the position of the seat cushion structure 24. The lifting column 23 is used to adjust the height of the seat cushion structure 23 and the backrest structure 25. The lifting column 23 and the slide rail 22 are connected by a sliding connection, allowing the lifting column 23 to slide up and down on the slide rail 22. The sliding connection uses a slider and guide rail combination to ensure that the lifting column 23 can slide smoothly. The slider and guide rail can be linear guide rail, ball screw, or sliding guide rail, etc. Different types of sliders and guide rails have different precision and load-bearing capacity. They are reasonably selected according to the design requirements of the dental chair equipment 2. The lifting column 23 has a height adjustment function, which can be adjusted according to the patient's height and treatment. Height adjustment is achieved by motor drive or manual adjustment to ensure convenient and accurate adjustment. The slide rail 22 is used to achieve sliding connection of the lifting column 23. It is made of high-strength materials such as steel and aluminum alloy, which have good rigidity and wear resistance. The slide rail 22 is fixedly installed on the base 21 to ensure that it will not loosen or shift during operation. The slide rail 22 is installed using bolted connections or welding to ensure a firm and reliable installation. The base 21 supports the entire dental chair equipment 2 and is made of heavy-duty materials such as steel and cast iron, providing excellent stability and load-bearing capacity. The shape and size of the base 21 are determined according to the design requirements of the dental chair equipment 2, and it can be rectangular or square. Its height and area parameters are rationally designed based on factors such as the stability of the dental chair equipment 2 and the operating space. To ensure the stability of the dental chair equipment 2 during operation, the base 21 is reinforced with reinforcing ribs and anchor bolts. The reinforcing ribs increase the strength and rigidity of the base, and the anchor bolts fix the base to the ground to prevent the equipment from shaking during operation. The design of the base 21 also considers the operating space. Its height and area parameters are rationally designed based on the height and operating habits of the operators to ensure that the operators can operate in a comfortable operating space.

[0031] The headrest structure 26 includes a headrest body 261 and two locking posts 262. Two ends of one side of the headrest body 261 are fixedly connected to one end of each of the two locking posts 262. Both locking posts 262 are engaged with the chair back structure 25. The chair back structure 25 includes a fixed chair back 251 and a telescopic chair back 252. One end of the fixed chair back 251 is connected to the fixed end of the telescopic chair back 252, and the movable end of the telescopic chair back 252 is connected to the headrest structure 26. The other end of the fixed chair back 251 is connected to the seat cushion structure 24. The headrest structure 26 is used to support the patient's head and is located at the upper end of the telescopic chair back 252. The shape and size of the headrest structure 26 are rationally designed according to the patient's head shape and treatment. Its height, angle, and width parameters are based on the patient's height, The body shape and treatment are reasonably adjusted to ensure that the patient receives sufficient support and comfort during treatment. The headrest structure 26 is connected to the telescopic backrest 252 via a carbon fiber rod, allowing for plug-and-play operation. The carbon fiber rod has advantages such as high strength, lightweight, and corrosion resistance, providing stable support for the headrest structure. The carbon fiber rod is connected by a plug-and-play method, facilitating the installation and disassembly of the headrest structure 26. The length and diameter of the carbon fiber rod are reasonably selected according to the design requirements of the headrest structure 26 to ensure a firm and reliable connection. The backrest structure 25 includes two parts: a fixed backrest 251 and a telescopic backrest 252. The fixed backrest 251 mainly serves to fix and connect the parts, and is made of high-strength materials such as steel and aluminum alloy, possessing good rigidity. For stability, the shape and size of the fixed backrest 251 are rationally designed according to the patient's body type and treatment. Its height, angle, and width are adjusted according to the patient's height, body type, and treatment to ensure adequate support and comfort during treatment. The telescopic backrest 252 primarily serves an adjustment function and is made of high-strength materials such as steel and aluminum alloy, possessing excellent rigidity and stability. The length of the telescopic backrest 252 can be adjusted according to the patient's height and treatment, ensuring adequate support and comfort during treatment. The telescopic backrest 252 is adjusted via motor drive or manual adjustment, ensuring convenient and accurate adjustment. The seat cushion structure 24 supports the patient's buttocks and is set at the height... Above the lowering column 23, it connects to the backrest structure 25. The position of the seat cushion structure 24 is designed with patient comfort and treatment in mind. Its height, angle, and fore-aft position are adjusted according to the patient's height, body type, and treatment needs to ensure the patient can maintain a comfortable posture during treatment. The seat cushion structure 24 is designed with patient comfort in mind, using soft materials such as sponge and leather, which have good elasticity and breathability. The shape and size of the seat cushion structure 24 are also rationally designed according to the patient's body type to ensure the patient receives sufficient support and comfort during treatment. The motor-driven lifting column 23 uses a DC motor or AC motor as the power source, and the height of the lifting column is adjusted through a reducer and lead screw transmission mechanism.Manually adjustable lifting columns use a screw or gear transmission mechanism, and the height of the lifting column is adjusted by manually rotating a handle or knob.

[0032] The seat cushion structure 24 is internally connected to the interlock module 3. The interlock module 3 primarily ensures a safe interlock between the CT scanner 1 and the dental chair 2. It prevents accidental operation of the dental chair 2 while the CT scanner is operating, thus ensuring the safety of both the patient and the operator. The interlock module 3 employs either electrical or mechanical interlocking. Electrical interlocking uses electrical signals to achieve the interlock function; when the CT scanner 1 is operating, the interlock module 3 sends a signal to the dental chair 2, locking it and preventing operation. Mechanical interlocking uses a mechanical structure to achieve the interlock function; when the CT scanner 1 is operating, the interlock module 3 locks the dental chair 2 through the mechanical structure, preventing accidental operation. The interlock module 3 has high reliability and stability and can operate normally under various working conditions. In addition to its regular operation, the interlock module 3 also has excellent protective performance, preventing damage from factors such as electrical interference and mechanical impact. The function of the interlock module 3 is to prevent the CT equipment 1 from suddenly activating while the doctor is treating the patient in the dental chair. This is because the CT equipment 1 emits radiation when it is working, and this radiation is harmful to the human body. Therefore, the CT equipment 1 should not be working during treatment, and it is locked by the interlock module 3. In addition, the dental chair equipment 2 should not move when the CT equipment 1 is working. Before the CT equipment 1 is working, the dental chair needs to be adjusted and the positioning confirmed. Then, the CT equipment 1 is started through the software operation. At this time, the interlock module 3 locks the dental chair equipment 2, and the CT equipment 1 works. If the dental chair is moving while the CT is working, artifacts will appear in the captured images, affecting the image quality.

[0033] During the installation of CT equipment 1, the base 13 is placed in a suitable position and reinforced with reinforcing ribs and anchor bolts to ensure its stability. The support column 12 is installed on the base 13 via the moving module 15 and adjusted to ensure that the support column 12 can move smoothly. The C-arm 11 is installed on the support column 12 via the central control rotating platform 14 and adjusted to ensure that the C-arm 11 can rotate around the support column 12. The X-ray emitting device 111 and the receiving device 112 are installed and adjusted to ensure that they can work normally.

[0034] During the installation of the dental chair device 2, the base 21 is placed in a suitable position and reinforced with reinforcing ribs and anchor bolts to ensure its stability. The slide rail 22 is fixedly installed on the base 21 and adjusted to ensure that the slide rail 22 is firmly and reliably installed. The lifting column 23 is installed on the slide rail 22 through a sliding connection and adjusted to ensure that the lifting column 23 can slide up and down smoothly. The seat cushion structure 24, backrest structure 25 and headrest structure 26 are installed and adjusted to ensure that they can meet the patient's comfort and treatment needs.

[0035] The installation and debugging of interlock module 3 involves installing interlock module 3 between CT equipment 1 and dental chair equipment 2, and debugging it to ensure that it can work normally. The function of interlock module 3 is tested to ensure that dental chair equipment 2 can be locked when CT equipment 1 is working, preventing accidental operation.

[0036] The preferred embodiments of this patent have been described in detail above. However, this patent is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this patent.

Claims

1. A vertical CBCT imaging device, comprising an imaging device, characterized in that, The imaging equipment includes a CT scanner and a dental chair. The dental chair has an interlock module installed inside, which is connected to the CT scanner. The CT scanner includes a C-arm, a support column, and a base. A movable module is fixedly mounted on the top of the base, and the top of the movable module is connected to the bottom of the support column. A hollow rotating platform is mounted on one side of the support column, and the C-arm is connected to one side of the hollow rotating platform. The dental chair includes a base and a lifting column. Slide rails are fixedly mounted on both sides of the inner wall of the base, and a movable block is slidably connected between the two slide rails. The top of the movable block is fixed to the bottom of the lifting column. The movable end of the lifting column is fixedly installed with a seat cushion structure. One side of the seat cushion structure is rotatably connected to a backrest structure, and one side of the backrest structure is connected to a headrest structure. The moving module includes two limiting plates and a lead screw. The opposite sides of the two limiting plates are rotatably connected to both ends of the lead screw. A second motor that drives the lead screw to rotate is fixedly installed on the surface of one of the limiting plates. Guide rails are provided on both sides of the lead screw. A slider that is slidably connected to the two guide rails is threaded to the middle of the lead screw. The top of the slider is fixedly connected to the supporting column. The bottom ends of the two limiting plates and the bottom ends of the two guide rails are fixedly connected to the base.

2. The vertical CBCT imaging device according to claim 1, characterized in that, The C-arm is equipped with an X-ray emitting device and a receiving device.

3. The vertical CBCT imaging device according to claim 1, characterized in that, The hollow rotating platform includes a first motor and a reducer. The output end of the first motor is fixedly connected to one end of the reducer. The output end of the reducer is fixedly mounted with a mounting shaft. One end of the mounting shaft is fixedly connected to a C-arm. An encoder is fixedly mounted on the surface of the first motor. One side of the first motor is fixedly connected to the side of the support column opposite to it.

4. The vertical CBCT imaging device according to claim 1, characterized in that, A cylinder is installed inside the base, and the movable end of the cylinder is connected to the side of the movable block that is directly opposite it.

5. The vertical CBCT imaging device according to claim 1, characterized in that, The headrest structure includes a headrest body and two locking posts. The two ends of one side of the headrest body are respectively fixedly connected to one end of the two locking posts. Both locking posts are engaged with the backrest structure. The backrest structure includes a fixed backrest and a telescopic backrest. One end of the fixed backrest is connected to the fixed end of the telescopic backrest, the movable end of the telescopic backrest is connected to the headrest structure, and the other end of the fixed backrest is connected to the seat cushion structure.

6. The vertical CBCT imaging device according to claim 1, characterized in that, The interior of the seat cushion structure is connected to an interlocking module.

Images