A dental chair waist and hip fitting backrest adjusting device adapted to planting operation

Abstract

The application relates to the technical field of dental chairs suitable for implant surgery, in particular to a waist-hip-adhesion backrest adjusting device of a dental chair suitable for implant surgery, which comprises a main unit, a driving device rotatably connected to the inner surface of the fixed frame, and a back bending part fixed to the outer surface of the swing frame. The driving device pushes the swing frame to swing, controls the pitching action of the back bending part and the backrest plate, and simultaneously, the swing of the swing frame drives the first pull rod and the second pull rod to drive the sliding shaft on the backrest plate to make telescopic motion on the shaft sleeve of the back bending part. The driving device is used for telescopic linkage with the backrest plate to realize pitching and telescopic operation, the chair position difference after the patient pitches is compensated, the patient avoids the back pressing feeling, the patient is more comfortable during the operation, and the operation difficulty is reduced.

Description

Technical Field

[0001] This invention relates to the field of dental chair technology adapted to implant surgery, specifically to a dental chair backrest adjustment device adapted to implant surgery. Background Technology

[0002] As dental implant technology demands greater precision and comfort, dental chairs adapted for implant surgery have also developed rapidly. These chairs not only assist doctors in performing precise operations and ensure safety, making implant surgery more convenient for doctors, but also make the surgery more comfortable for patients.

[0003] In existing technologies, dental chairs designed for implant surgery typically use a seat cushion that adjusts to compensate for a small angle when the patient lies down during the procedure. This reduces the backrest's tilt angle, thus minimizing the feeling of pressure on the back. However, because each patient's height and body type are different, a fixed seat cushion cannot meet the needs of every patient. Consequently, it cannot completely eliminate the feeling of pressure on the back during the procedure, resulting in lower patient comfort. This can cause discomfort and restlessness when patients maintain one position for extended periods, affecting the progress of the surgery and increasing its difficulty. Summary of the Invention

[0004] The purpose of this invention is to address the problem that dental chairs designed for implant surgery typically use a seat cushion that adjusts to compensate for a small angle when the patient lies down during the procedure. This reduces the backrest tilt angle and minimizes the feeling of pressure on the back. However, due to variations in patient height and body shape, a fixed seat cushion cannot meet the needs of every patient, thus failing to completely eliminate the feeling of pressure on the back during surgery. This results in lower patient comfort during the procedure, causing discomfort and restlessness when maintaining one posture for extended periods, which can affect the progress of the surgery and increase its difficulty. Therefore, this invention proposes a lumbar and hip-fitting backrest adjustment device for dental chairs suitable for implant surgery.

[0005] The objective of this invention can be achieved through the following technical solutions: A dental chair lumbar and hip support adjustment device adapted for implant surgery, the dental chair lumbar and hip support adjustment device adapted for implant surgery includes: The main unit includes a fixed frame and a swing frame rotatably connected to the inner side of the fixed frame, wherein the outer surface of the swing frame is fixedly connected with a back bend; The adjustment unit includes a drive device rotatably connected to the inner surface of the fixed frame, the output end of the drive device being rotatably connected to the swing frame, a pair of first pull rods being rotatably connected to the inner surface of the fixed frame, and both of the first pull rods being rotatably connected to the swing frame, a second pull rod being rotatably connected to the outer surface of each pair of first pull rods, a backrest plate being rotatably connected to the pair of second pull rods, a pair of bushings being fixedly connected to the inner side of the backrest, and a pair of sliding shafts being fixedly connected to the outer surface of the backrest plate, with the pair of sliding shafts engaging with the pair of bushings; The bottom control unit includes a support column fixedly connected to the bottom end of the fixed frame, and the bottom end of the outer wall of the support column is provided with a base plate.

[0006] In a preferred embodiment of the present invention, the fixing frame includes a fixing base and an adjusting frame; the fixing base is rotatably connected to the adjusting frame; a power device is fixedly connected to the inner surface of the fixing base; a connecting base is fixedly connected to the outer surface of the adjusting frame; and the output end of the power device is rotatably connected to the connecting base.

[0007] In a preferred embodiment of the present invention, the bottom end of the outer wall of the support column is rotatably connected to the top end of the outer wall of the base plate; a first bevel gear is fixedly connected to the outer wall of the support column; a motor is fixedly connected to the top end of the outer wall of the base plate; the output end of the motor is provided with a rotating shaft; a second bevel gear is fixedly connected to one end of the outer wall of the rotating shaft, and the second bevel gear meshes with the first bevel gear.

[0008] In a preferred embodiment of the present invention, the support column includes a circular shell and a circular column; the outer side wall of the circular column is slidably connected to the inner side wall of the circular shell; a first hydraulic cylinder is fixedly connected to the top of the outer wall of the base plate; a connecting ring is fixedly connected to the output end of the first hydraulic cylinder, and the annular ring is rotatably connected to the circular column.

[0009] In a preferred embodiment of the present invention, a second hydraulic cylinder is fixedly connected to the inner surface of the fixing frame; a connecting plate is fixedly connected to the output end of the second hydraulic cylinder; a lifting plate is fixedly connected to the top of the outer wall of the connecting plate; and the lifting plate fits into the inner side wall of the fixing frame.

[0010] In a preferred embodiment of the present invention, the fixing frame is provided with a controller, which is electrically connected to the driving device and the second hydraulic cylinder respectively; a flexible pressure sensor array is fixedly installed in the embedded mounting cavity on the side of the backrest facing away from the patient, and the flexible pressure sensor array is electrically connected to the controller to collect the patient's back contact pressure data and output a pressure distribution matrix to the controller.

[0011] In a preferred embodiment of the present invention, an angle sensor is coaxially fixed at the rotating connection shaft end of the pendulum frame and the fixed frame. The angle sensor is electrically connected to the controller and is used to collect the pitch angle of the pendulum frame and output attitude angle parameters to the controller. The controller generates an attitude correction pressure matrix based on the pressure distribution matrix and the attitude angle parameters.

[0012] In a preferred embodiment of the present invention, a tension sensor is fixedly provided on the outer wall of the first pull rod near the end connected to the swing frame. The tension sensor is electrically connected to the controller and is used to collect the force data of the first pull rod and output the link load parameters to the controller. The controller constructs a waist-hip fit state vector based on the attitude correction pressure matrix and the link load parameters, and outputs the target compensation displacement through a pre-trained support vector regression model.

[0013] In a preferred embodiment of the present invention, a linear displacement sensor is fixedly provided at the center of the bottom of the lifting plate. The linear displacement sensor is electrically connected to the controller and is used to collect the real-time lifting displacement of the lifting plate relative to the fixed frame and output height compensation parameters to the controller.

[0014] In a preferred embodiment of the present invention, the controller fuses the height compensation parameter with the waist-hip fit state vector to generate a multi-source feature matrix, predicts the body shape matching coefficient through the constructed adaptive neural network model, and dynamically corrects the target compensation displacement based on the body shape matching coefficient to generate an optimized compensation displacement; the optimized compensation displacement serves as the collaborative control input for the drive device and the second hydraulic cylinder.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. By driving the swing frame through a drive device, the backrest and backrest panel are controlled to tilt. At the same time, the swing frame swing will drive the first and second pull rods, which in turn drive the sliding shaft on the backrest panel to extend and retract on the bushing on the backrest panel. This application uses the drive device to extend and retract to drive the backrest panel to tilt and retract, thereby compensating for the difference in chair position after the patient tilts and retracts, preventing the patient from feeling pressure on their back. This eliminates the need for cushion-based compensation, allowing the application to be adjusted according to the needs of each patient, making the patient more comfortable during surgery and reducing the difficulty of the surgery.

[0016] 2. The motor drives the rotating shaft to rotate, which in turn drives the second bevel gear to rotate. The second bevel gear then drives the first bevel gear to rotate, which in turn drives the support column and the fixing frame to rotate. When the patient is lying on the fixing frame, the angle of the patient can be adjusted by the motor drive, allowing the patient to rotate and adjust at multiple angles as needed during the operation. This further improves the convenience of the surgical operation, allowing doctors to choose the appropriate angle more flexibly and ensuring that the patient's position is always in the best condition, reducing surgical interference caused by improper positioning. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a structural diagram of the main body of the present invention; Figure 2 This is a structural diagram of the adjustment unit of the present invention; Figure 3 This is a partial structural diagram of the main body of the present invention; Figure 4 This is an exploded structural diagram of the adjusting frame and lifting plate of the present invention; Figure 5 This is an exploded structural diagram of the fixing base and support column of the present invention.

[0019] In the diagram: 100, Main unit; 101, Fixed frame; 102, Swing frame; 103, Back bend; 200, Adjustment unit; 201, Drive device; 202, First tie rod; 203, Second tie rod; 204, Backrest plate; 205, Bushing; 206, Sliding shaft; 300, Bottom control unit; 301, Support column; 302, Base plate; 1011, Fixed seat; 1012, Adjustment frame; 1013, Power device; 1014, Connecting seat; 303, First bevel gear; 304, Motor; 305, Rotating shaft; 306, Second bevel gear; 3011, Circular shell; 3012, Circular column; 3013, First hydraulic cylinder; 3014, Connecting ring; 207, Second hydraulic cylinder; 208, Connecting plate; 209, Lifting plate. Detailed Implementation

[0020] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0021] Please see Figures 1-5 As shown, a dental chair lumbar and hip-fitting backrest adjustment device adapted for implant surgery includes a main unit 100, which includes a fixed frame 101 and a swing frame 102 rotatably connected to the inner side of the fixed frame 101. A back bend 103 is fixedly connected to the outer surface of the swing frame 102. The adjustment unit 200 includes a drive device 201 rotatably connected to the inner surface of the fixed frame 101. The output end of the drive device 201 is rotatably connected to the swing frame 102. A pair of first pull rods 202 are rotatably connected to the inner surface of the fixed frame 101, and both of the first pull rods 202 are rotatably connected to the swing frame 102. A second pull rod 203 is rotatably connected to the outer surface of both of the first pull rods 202. A backrest plate 204 is rotatably connected to the pair of second pull rods 203. A pair of bushings 205 are fixedly connected to the inner side of the backrest 103. A pair of sliding shafts 206 are fixedly connected to the outer surface of the backrest plate 204, and the pair of sliding shafts 206 and the pair of bushings 205 are engaged. The bottom control unit 300 includes a support column 301 fixedly connected to the bottom end of the fixing frame 101, and a base plate 302 is provided at the bottom end of the outer wall of the support column 301.

[0022] The swing arm 102 is driven by the drive device 201 to swing, thereby controlling the backrest 103 and the backrest 204 to tilt. At the same time, the swing arm 102 swings, which in turn drives the first pull rod 202 and the second pull rod 203, which in turn drives the sliding shaft 206 on the backrest 204 to extend and retract on the bushing 205 on the backrest 103. This application uses the drive device 201 to extend and retract, which in turn drives the backrest 204 to tilt and extend, thereby compensating for the difference in chair position after the patient tilts and retracts. This prevents the patient from feeling pressure on their back and eliminates the need for cushion compensation. This application can be adjusted according to the needs of each patient, making the patient more comfortable during surgery and reducing the difficulty of the surgery.

[0023] A second hydraulic cylinder 207 is fixedly connected to the inner surface of the fixed frame 101; a connecting plate 208 is fixedly connected to the output end of the second hydraulic cylinder 207; a lifting plate 209 is fixedly connected to the top of the outer wall of the connecting plate 208; the lifting plate 209 fits into the inner side wall of the fixed frame 101. The second hydraulic cylinder 207 drives the connecting plate 208 to rise and fall, which in turn drives the lifting plate 209 to rise and fall, which in turn drives the air cushion or other leather covering the fixed frame 101 to rise and fall, thus raising the patient's body position. In conjunction with the extension and retraction of the backrest 204, patients of different body types can comfortably undergo surgery. Patients can make subtle adjustments according to their own needs during the operation, thereby further reducing physical discomfort and effectively reducing the surgical risks caused by improper body position. The dental chair can better adapt to patients of different body types and heights, providing more stable support for the operation, making the operation smoother, and further improving the overall medical effect.

[0024] The bottom end of the outer wall of the support column 301 is rotatably connected to the top end of the outer wall of the base plate 302; a first bevel gear 303 is fixedly connected to the outer wall of the support column 301; a motor 304 is fixedly connected to the top end of the outer wall of the base plate 302; a rotating shaft 305 is provided at the output end of the motor 304; a second bevel gear 306 is fixedly connected to one end of the outer wall of the rotating shaft 305, and the second bevel gear 306 meshes with the first bevel gear 303. The motor 304 drives the rotating shaft 305 to rotate, and the rotating shaft 305 drives the second bevel gear 306 to rotate. 06 drives the first bevel gear 303 to rotate, which in turn drives the support column 301 and the fixing frame 101 to rotate. When the patient lies on the fixing frame 101, the angle of the patient can be adjusted by the motor 304, allowing the patient to rotate and adjust at multiple angles as needed during the operation. This further improves the convenience of the operation, allowing doctors to choose the appropriate angle for the operation more flexibly, and ensuring that the patient's position is always in the best condition, reducing surgical interference caused by improper positioning.

[0025] The fixed frame 101 includes a fixed base 1011 and an adjusting frame 1012; the fixed base 1011 and the adjusting frame 1012 are rotatably connected; a power device 1013 is fixedly connected to the inner surface of the fixed base 1011; a connecting seat 1014 is fixedly connected to the outer surface of the adjusting frame 1012; the output end of the power device 1013 is rotatably connected to the connecting seat 1014. Because the fixed frame 101 includes a fixed base 1011 and an adjusting frame 1012, and the fixed base 1011 and the adjusting frame 1012 are rotatably connected, when the power device 1013 extends or retracts, it drives the adjusting frame 1012. 12. By changing the angles of the adjustable frame 1012, the backrest 103, and the backrest 204, the patient can sit on the adjustable frame 1012 with their back resting on the backrest 204, causing the patient to tilt and recline. The angle of this reclining position can be adjusted, allowing the application to be flexibly adjusted according to the specific needs of the surgery. This ensures that the patient's position changes are more stable and comfortable at different stages, and also makes it easier for the doctor to perform surgery while allowing the light to illuminate the surgical site for clearer observation.

[0026] The support column 301 includes a circular shell 3011 and a circular column 3012; the outer side wall of the circular column 3012 is slidably connected to the inner side wall of the circular shell 3011; a first hydraulic cylinder 3013 is fixedly connected to the top of the outer wall of the base plate 302; a connecting ring 3014 is fixedly connected to the output end of the first hydraulic cylinder 3013, and the ring is rotatably connected to the circular column 3012. Through the support column 301 including the circular shell 3011 and the circular column 3012, when the first hydraulic cylinder 3013 is started, it drives the connecting ring 3014 to rise and fall, and the connecting ring 3014 drives the circular column 3012 and the fixed frame 101 to rise and fall. This allows for easy adjustment of the patient's height when they are lying on the fixation frame 101 in preparation for surgery. This eliminates the need for the doctor to bend over to adjust the distance between themselves and the patient, reducing the doctor's fatigue during the procedure and improving the precision and efficiency of the surgery. In addition, the height adjustment function can be flexibly adjusted according to the layout of the equipment around the operating table, ensuring that the doctor can easily operate other medical instruments and further optimize the surgical environment. Through the synergistic effect of multiple units, this application not only improves the patient's comfort but also provides the doctor with more flexible and convenient operating conditions.

[0027] In use, the swing frame 102 is driven by the drive device 201 to swing, thereby controlling the backrest 103 and the backrest 204 to tilt. At the same time, the swing of the swing frame 102 will drive the first pull rod 202 and the second pull rod 203, which in turn drives the sliding shaft 206 on the backrest 204 to extend and retract on the bushing 205 on the backrest 103. This application uses the drive device 201 to extend and retract, which in turn drives the backrest 204 to tilt and extend, thereby compensating for the difference in chair position after the patient tilts and retracts. This avoids the feeling of back pressure for the patient and eliminates the need for seat cushion compensation. This application can be adjusted according to the needs of each patient, making the patient more comfortable during surgery and reducing the difficulty of the surgery.

[0028] The fixed frame 101 includes a fixed base 1011 and an adjusting frame 1012, with the fixed base 1011 and the adjusting frame 1012 rotatably connected. When the power device 1013 extends or retracts, it drives the adjusting frame 1012 to change its angle, thereby changing the angle of the adjusting frame 1012, the backrest 103, and the backrest 204. When the patient sits on the adjusting frame 1012 and rests their back on the backrest 204, the patient tilts to a reclining position, and the reclining angle is adjustable. This allows the application to be flexibly adjusted according to the specific needs of the surgery, ensuring that the patient's position changes more smoothly and comfortably at different stages. Adjusting the patient's position also makes it easier for the doctor to perform surgery, and also makes it easier for the light to illuminate the surgical site, allowing the doctor to observe more clearly.

[0029] The motor 304 drives the rotating shaft 305 to rotate, which in turn drives the second bevel gear 306 to rotate. The second bevel gear 306 then drives the first bevel gear 303 to rotate, which in turn drives the support column 301 and the fixing frame 101 to rotate. When the patient lies on the fixing frame 101, the angle of the patient can be adjusted by the motor 304, allowing the patient to rotate and adjust at multiple angles as needed during the operation. This further improves the convenience of the surgical operation, enabling doctors to choose the appropriate angle more flexibly and ensuring that the patient's position is always optimal, reducing surgical interference caused by improper positioning.

[0030] The support column 301, comprising a circular shell 3011 and a circular column 3012, enables the first hydraulic cylinder 3013 to drive the connecting ring 3014 to rise and fall when activated. The connecting ring 3014 then drives the circular column 3012 and the fixing frame 101 to rise and fall, allowing the patient to lie on the fixing frame 101 in preparation for surgery. This facilitates height adjustment, eliminating the need for the doctor to bend over to adjust the distance between themselves and the patient, thus reducing the doctor's fatigue during surgery and improving the precision and efficiency of the operation. Furthermore, the height adjustment function can be flexibly adjusted according to the layout of equipment around the operating table, ensuring that the doctor can easily operate other medical instruments and further optimize the surgical environment. Through the synergistic effect of multiple units, this application not only improves patient comfort but also provides doctors with more flexible and convenient operating conditions.

[0031] The second hydraulic cylinder 207 drives the connecting plate 208 to rise and fall, which in turn drives the lifting plate 209 to rise and fall. The lifting plate 209 then drives the air cushion or other materials wrapped around the fixed frame 101 to rise and fall, raising the patient's body position. Combined with the extension and retraction of the backrest 204, this allows patients of different body types to comfortably undergo surgery. Patients can make subtle adjustments according to their own needs during the operation, further reducing physical discomfort and effectively lowering the surgical risks caused by improper positioning. The dental chair can better adapt to patients of different body types and heights, providing more stable support for the operation, making the surgical process smoother, and further improving the overall medical effect. Example

[0032] Please see Figures 2-4 As shown, this embodiment, based on the dental chair lumbar and hip fitting backrest adjustment device adapted for implant surgery in Embodiment 1, provides a lumbar and hip fitting adjustment method based on multi-sensor fusion, which is used to solve the problem of back pressure or local suspension caused by uneven back contact pressure and mismatch of lumbar and hip support height during the tilting and extension of the backrest 204 by patients of different heights and body types.

[0033] The fixed frame 101 is equipped with a controller, which is located in the mounting cavity. The controller is electrically connected to the drive device 201 and the second hydraulic cylinder 207. The controller includes a main processing unit, an analog-to-digital conversion unit, a storage unit, and an execution drive unit. The analog-to-digital conversion unit is used for signal conversion, the main processing unit is used for calculating the compensation displacement, and the execution drive unit is used for outputting control signals.

[0034] Furthermore, the adjustment process in this embodiment includes the following steps: Step S61: A flexible pressure sensor array is fixedly installed on the backrest panel 204 on the side facing away from the patient to collect the pressure data of the patient's back and generate a pressure distribution matrix. Specifically, the flexible pressure sensor array is evenly arranged along the length and width of the backrest panel 204, using 8 rows and 6 columns of piezoresistive thin-film pressure sensing units. The sensing units correspond to the pressure detection areas on the backrest panel 204, and the mounting surface of the sensing units is parallel to the support surface of the backrest panel 204, so that the pressure exerted by the patient's back on the backrest panel 204 can be transmitted to the corresponding sensing unit. Before use, the flexible pressure sensor array is calibrated. During calibration, a standard loading device is applied to each sensing unit sequentially. The loading range is determined according to the normal bearing pressure of the dental chair, for example, from 0N to 500N, with each 50N serving as a first-level loading value. The voltage values ​​output by the sensing units at each loading level are recorded. The controller uses the least squares method to fit the correspondence between pressure and voltage. in, express Line number The pressure value corresponding to the column sensing unit, This indicates the voltage value output by the sensing unit. Represents the proportionality coefficient. Indicates the zero-point compensation value. and The pressure values ​​are obtained from calibration experiments and stored in the controller's storage unit. When the patient's back is against the backrest 204, the flexible pressure sensor array synchronously outputs the pressure values ​​of each detection area. The controller generates a pressure distribution matrix according to the row and column positions of the sensor units. : Pressure distribution matrix This is used to characterize the contact pressure distribution between the patient's back and the backrest 204. Areas with higher pressure values ​​correspond to locations where the patient's back is subjected to greater pressure, while areas with lower or near-zero pressure values ​​correspond to locations with insufficient support or suspension. This transforms the patient's subjective feeling of back pressure or suspension into calculable pressure distribution data, providing a basic input for subsequent posture correction and compensation adjustments.

[0035] In step S62, an angle sensor is coaxially fixed at the rotating connection shaft end between the pendulum frame 102 and the fixed frame 101 to collect the pitch angle of the pendulum frame 102 and generate attitude angle parameters. The controller generates an attitude correction pressure matrix based on the pressure distribution matrix and the attitude angle parameters. Specifically, the angle sensor adopts an absolute magnetic encoder or a potentiometric angle sensor, and its detection axis is coaxially arranged with the axis of rotation of the pendulum frame 102 relative to the fixed frame 101. When the driving device 201 pushes the pendulum frame 102 to swing, the angle sensor synchronously outputs the real-time pitch angle of the pendulum frame 102. and attitude angle parameters The data is transmitted to the controller. Because the direction of pressure exerted on the backrest 204 by the patient's back changes with the posture of the backrest as the backrest 102 tilts, the pressure distribution of the same patient at different tilt angles cannot be directly compared. Therefore, the controller uses the initial comfortable sitting posture and the tilt angle of the backrest 102 as the reference point. As a reference angle, based on the current attitude angle For the pressure distribution matrix Attitude correction is performed, which includes pressure projection correction and measurement point position correction. Pressure projection correction is used to convert the pressure value measured under the current attitude to the equivalent pressure value under the reference attitude. The calculation method is as follows: in, Indicates the first Line number The attitude correction pressure value of the column detection area, and the measurement point position correction are used to map the position of the pressure detection area to the reference attitude coordinate system. Let the first... Line number The mounting coordinates of the column sensing unit on the backrest panel 204 are as follows: , The controller then adjusts the tilt angle of the pendulum frame 102 accordingly. By rotating and mapping the coordinates, we obtain the corrected coordinates. , The controller will adjust the attitude correction pressure value. and corresponding corrected coordinates , Combined to form an attitude correction pressure matrix This eliminates the interference of backrest 204 pitch attitude changes on pressure judgment.

[0036] Step S63: A tension sensor is fixedly installed on the outer wall of the first pull rod 202 near the end connected to the swing frame 102 to collect the force data of the first pull rod 202 and generate the link load parameters. Specifically, the tension sensor is a strain gauge type, with its sensitive grid arranged along the force direction of the first tie rod 202 and fixed to the outer wall of the first tie rod 202 by a protective housing. The first tie rod 202 bears the transmitted load during the pitching of the swing frame 102 and the extension / retraction of the backrest 204. Therefore, the magnitude of its force can reflect the mechanical transmission load state between the swing frame 102, the first tie rod 202, the second tie rod 203, and the backrest 204. After assembly, the tension sensor undergoes zero-point calibration and range calibration. Zero-point calibration involves recording the sensor output value when the backrest 204 is not supporting a patient and using this output value as the zero-point compensation value. Range calibration involves applying a known tension force to the first tie rod 202 and establishing a linear correspondence between the sensor output signal and the actual tension force. During operation, the controller converts the sensor output signal into linkage load parameters according to the calibration parameters. Linkage load parameters Patient comfort is not assessed separately, and is related to the posture correction pressure matrix. Used together, when the attitude correction pressure matrix The display shows a localized increase in pressure, while the connecting rod load parameters... When the pressure increases, it indicates insufficient mechanical compensation from the backrest 204, resulting in compression between the patient's back and the backrest 204; when the posture correction pressure matrix... The display shows that the local pressure is low, while the connecting rod load parameters are low. If the pressure is too low, it indicates that the corresponding area is not supported enough. This combines the pressure of human contact with the force of the mechanical linkage to avoid misjudgment caused by relying solely on pressure data.

[0037] Step S64, the controller corrects the pressure matrix based on the attitude. and link load parameters Construct the waist-hip fit state vector. Specifically, the controller adjusts the pressure matrix based on the posture. Extract the average corrected pressure Maximum correction pressure Pressure dispersion and pressure center coordinates , Mean Correction Pressure Used to indicate the overall stress level on the patient's back; maximum corrected pressure. Used to indicate the degree of localized pressure; pressure dispersion Used to represent the uniformity of pressure distribution; coordinates of the pressure center. , The coordinates of the pressure center are obtained by weighted averaging and are used to represent the positional offset of the main pressure area on the patient's back relative to the backrest 204. Pressure dispersion Each correction pressure value can be used relative to the average correction pressure. The standard deviation represents the controller's... , , , , and connecting rod load parameters The waist-hip fit state vector is formed in a fixed order. Waist-hip fit state vector The factors in the equation are derived from the output of the preceding steps, among which the attitude correction pressure matrix is... Provides human body fit status and linkage load parameters. It provides the mechanical stress state, thereby compressing the scattered pressure and mechanical load information into a unified state description that can be input into the model, so that the subsequent model can determine whether the current backrest 204 needs compensation and the direction of compensation.

[0038] Step S65, the controller transfers the waist-hip fit state vector Input a pre-trained support vector regression model and output the target compensation displacement. The support vector regression model is used to establish the waist-hip fit state vector. The nonlinear correspondence between the backrest compensation displacement and the support vector regression model includes an input layer, a kernel function mapping layer, and a regression output layer. The input layer receives the lumbar-hip fit state vector. The kernel function mapping layer uses radial basis kernel functions to map the nonlinear fitting state to a high-dimensional feature space; the regression output layer outputs the target compensation displacement. The radial basis function kernel function is expressed as: ,in and This represents the waist-hip fit state vector corresponding to two training samples. The kernel function width parameter is used to describe the model training process. Volunteers with different heights, weights, and lumbar-hip curvatures are selected as the sample, with a minimum of 200 volunteers. Volunteers are placed on the dental chair at different backrest tilt angles and different heights of the adjustable seat, and the corresponding posture correction pressure matrix is ​​collected. Linkage load parameters And calculate the waist-hip fit state vector. Simultaneously, by gradually adjusting the drive device 201, the extension and retraction position of the backrest 204 is changed, and the changes are recorded. decline, The backrest compensation displacement that is reduced when the volunteer's comfort score meets the preset requirement is used as the training label. The comfort rating can be based on a 5-point scale, with volunteers evaluating back pressure, lumbar support, and postural stability. Pressure dispersion is also considered. Whether to reduce the weight is an objective constraint to avoid relying solely on subjective ratings. After training, the model parameters are stored in the controller's storage unit. During runtime, the controller will construct the waist-hip fit state vector. Input the support vector regression model to obtain the target compensation displacement. Target compensation displacement This indicates the amount of displacement that the backrest 204 needs to compensate for relative to the current state in order to reduce local pressure and improve fit, under the current back pressure distribution and linkage force conditions. This means that the compensation displacement no longer depends on a fixed mechanical ratio, but is dynamically determined by the actual patient's body shape and force conditions.

[0039] Step S66: A linear displacement sensor is fixedly installed at the center of the bottom of the lifting plate 209 to collect the real-time lifting displacement of the lifting plate 209 relative to the fixed frame 101 and generate height compensation parameters. Specifically, the linear displacement sensor is arranged along the lifting direction of the lifting plate 209, with its fixed end connected to the fixed frame 101 and its movable end connected to the center of the bottom of the lifting plate 209. When the second hydraulic cylinder 207 drives the lifting plate 209 to rise and fall through the connecting plate 208, the linear displacement sensor outputs the real-time displacement of the lifting plate 209 relative to the fixed frame 101, and the controller obtains the height compensation parameters based on the sensor output. Height compensation parameters This parameter indicates the current height of the patient's lower back and hips supported by the lifting plate 209. For patients of different heights and lower back curvatures, even if the pitch and extension positions of the backrest 204 are the same, the required support height for the lower back and hips may differ. Therefore, the height compensation parameter... The state vector must be in contact with the waist and hips. They jointly participate in subsequent compensation and correction, thereby introducing a vertical support state, so that the adjustment is not limited to the pitch and extension of the backrest 204, but can also take into account the lumbar and hip height support.

[0040] Step S67, the controller will adjust the height compensation parameters. Vector of fit between waist and hip A multi-source feature matrix is ​​generated by fusing these features, and an adaptive neural network model is used to predict body shape matching coefficients. Specifically, the controller uses the waist-hip fit state vector... With height compensation parameters The features are assembled in a fixed order to form a multi-source feature matrix. : Multi-source feature matrix In , , , and Derived from the attitude correction pressure matrix , The link load parameters are derived from the output of the tension sensor. The height compensation parameters are derived from the output of a linear displacement sensor, and an adaptive neural network model is used to calculate the multi-source feature matrix. Predicted body type matching coefficient It includes an input layer, a first hidden layer, a second hidden layer, and an output layer. The number of nodes in the input layer and the multi-source feature matrix are... The number of features is consistent; the first hidden layer preferably has 64 neurons to extract the nonlinear relationship between pressure distribution and mechanical load; the second hidden layer preferably has 32 neurons to further extract the correlation features between height support and waist-hip fit; the output layer has 1 neuron to output the body shape matching coefficient. The hidden layer activation function uses the ReLU function, the loss function uses the mean squared error function, the optimization algorithm uses the Adam algorithm, and the initial learning rate is set to 0.001. The training data of the adaptive neural network model is consistent with the data collection scenario of the support vector regression model, but its training labels are body size matching coefficients. Body type matching coefficient Based on the target compensation displacement Compared with the actual optimal compensation displacement after final manual fine-tuning The calculation yielded: in, It is predicted by the support vector regression model from the training samples. To determine the optimal compensation displacement after pressure equalization and comfort verification, the model, once trained, can output a body shape matching coefficient that adapts to the patient's body shape based on the current pressure distribution, linkage load, and lifting height. This allows for body shape correction of the target compensation displacement output by the support vector regression model, particularly for patients with large lumbar and hip curvatures or tall stature. It can be greater than 1, allowing for an appropriate increase in the compensation displacement; for patients with a larger back contact area and more uniform pressure distribution. It can be less than 1, so that the compensation displacement is appropriately reduced, thereby avoiding overcompensation.

[0041] Step S68, the controller determines the body type matching coefficient. Target compensation displacement Dynamic corrections are performed to generate optimized compensation displacement, which is then converted into coordinated control inputs for the drive device 201 and the second hydraulic cylinder 207. Specifically, the controller calculates the optimized compensation displacement. ,in The target compensation displacement is the output of the support vector regression model. The controller, based on the mechanical transmission relationship of this application, optimizes the compensation displacement by using the body shape matching coefficients output by the adaptive neural network model. Converted into the telescopic control quantity of drive device 201 Lifting control quantity of the second hydraulic cylinder 207 The telescopic control quantity of drive device 201 Used to drive the swing frame 102 to swing, the first pull rod 202 and the second pull rod 203 drive the backrest plate 204 to extend and retract relative to the back bend 103, causing the sliding shaft 206 to move within the bushing 205; the lifting control of the second hydraulic cylinder 207. Used to push the lifting plate 209 up and down via the connecting plate 208. ,in This represents the mapping coefficient between the extension / retraction of the drive device 201 and the compensation displacement of the backrest panel 204. This represents the mapping coefficient between the extension / retraction of the second hydraulic cylinder 207 and the height compensation of the lifting plate 209. and The device is calibrated before leaving the factory. The calibration method involves controlling the drive device 201 and the second hydraulic cylinder 207 to move a known stroke, measuring the extension and retraction displacement of the backrest plate 204 and the lifting plate 209, and obtaining the corresponding mapping coefficients through linear fitting or piecewise fitting. The controller outputs a control signal to the drive device 201 to extend and retract. The corresponding stroke; the drive device 201 pushes the swing frame 102 to swing, the swing frame 102 drives the backrest 103 and the backrest 204 to tilt, and at the same time, the sliding shaft 206 on the backrest 204 extends and retracts along the bushing 205 through the first pull rod 202 and the second pull rod 203, thereby compensating for the chair position difference caused by the patient's back changing posture. The controller simultaneously outputs a control signal to the second hydraulic cylinder 207, causing the second hydraulic cylinder 207 to extend and retract. In the corresponding stroke, the second hydraulic cylinder 207 drives the lifting plate 209 to rise and fall through the connecting plate 208 to compensate for the height of the patient's waist and hips. The pressure distribution matrix is ​​used to determine whether there is local compression or suspension. The posture angle parameter is used to eliminate posture influence and generate a posture correction pressure matrix. The linkage load parameter is used to determine the mechanical transmission load. The height compensation parameter is used to correct the differences in waist and hip support for different body types, so that the pitch extension and retraction of the backrest 204 and the rise and fall of the lifting plate 209 form a coordinated adjustment, rather than two independent actions.

[0042] In step S69, the controller performs closed-loop calibration after the adjustment is executed. Specifically, after the drive device 201 and the second hydraulic cylinder 207 complete an adjustment action, the controller rereads the data from the flexible pressure sensor array, angle sensor, tension sensor, and linear displacement sensor, and regenerates the pressure distribution matrix. Attitude angle parameters Linkage load parameters and height compensation parameters And recalculate the optimized compensation displacement according to steps S62 to S68. When the recalculated optimized compensation displacement is obtained When the displacement is less than the preset stability threshold, the controller determines that the backrest 204 and the lifting plate 209 have reached a stable fit. The preset stability threshold can be determined through a comfort experiment, for example, set to 2mm. This value indicates that if the adjustment is further reduced to less than this displacement, the improvement in patient pressure distribution is no longer significant, and further adjustment may cause unnecessary mechanical disturbance. If the optimized compensation displacement is recalculated... If the value is still greater than the preset stability threshold, the controller continues to execute step S68 to perform the next round of coordinated adjustment. To avoid frequent system oscillations caused by temporary patient movement, the number of consecutive adjustments can be limited. For example, after each posture adjustment, a maximum of three consecutive adjustments can be made. After exceeding the limit, the current state is maintained and the system enters monitoring mode. During the surgery, the controller continuously monitors the posture correction pressure matrix. Linkage load parameters and height compensation parameters When the patient moves slightly, the doctor adjusts the backrest angle, or the height of the lifting plate 209 changes, the controller re-executes the above calculation and adjustment process, so that this application can maintain the waist and hips in a close fit throughout the implantation surgery, reduce the body movement caused by local pressure, and thus reduce surgical interference.

[0043] Through the above implementation methods, this embodiment achieves a complete closed loop from pressure acquisition, posture correction, linkage force judgment, height compensation fusion, to compensation displacement prediction, body shape correction, and mechanical execution adjustment. Compared with conventional dental chairs that only adjust the backrest angle by fixing the linkage ratio or manually pressing a button, this application automatically generates compensation displacement based on the patient's actual back pressure distribution, frame posture, linkage load, and lifting plate height, and synchronously controls the drive device 201 and the second hydraulic cylinder 207 to coordinate the pitch extension of the backrest 204 with the lifting of the lifting plate 209. As a result, patients of different body types receive stable lumbar and hip support and uniform back force during implant surgery, reducing back pressure and suspension sensations, improving patient comfort, and reducing surgical interference caused by body position discomfort.

[0044] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A dental chair backrest adjustment device for implant surgery, characterized in that, The dental chair lumbar and hip support adjustment device for implant surgery includes: The main unit (100) includes a fixed frame (101) and a swing frame (102) rotatably connected to the inner side of the fixed frame (101), wherein the outer surface of the swing frame (102) is fixed with a back bend (103). The adjustment unit (200) includes a drive device (201) rotatably connected to the inner surface of the fixed frame (101), the output end of the drive device (201) being rotatably connected to the swing frame (102), a pair of first pull rods (202) being rotatably connected to the inner surface of the fixed frame (101), and both of the first pull rods (202) being rotatably connected to the swing frame (102), a pair of second pull rods (203) being rotatably connected to the outer surface of both of the first pull rods (202), a pair of second pull rods (203) being rotatably connected to the backrest plate (204), a pair of bushings (205) being fixedly connected to the inner side of the backrest (103), and a pair of sliding shafts (206) being fixedly connected to the outer surface of the backrest plate (204), and the pair of sliding shafts (206) engaging with the pair of bushings (205); The bottom control unit (300) includes a support column (301) fixedly connected to the bottom end of the fixing frame (101), and the bottom end of the outer wall of the support column (301) is provided with a base plate (302).

2. The dental chair lumbar and hip-fitting backrest adjustment device for implant surgery according to claim 1, characterized in that, The fixed frame (101) includes a fixed base (1011) and an adjusting frame (1012); the fixed base (1011) and the adjusting frame (1012) are rotatably connected; a power device (1013) is fixedly connected to the inner surface of the fixed base (1011); a connecting seat (1014) is fixedly connected to the outer surface of the adjusting frame (1012); the output end of the power device (1013) is rotatably connected to the connecting seat (1014).

3. The dental chair lumbar and hip support adjustment device for implant surgery according to claim 2, characterized in that, The bottom of the outer wall of the support column (301) is rotatably connected to the top of the outer wall of the base plate (302); a first bevel gear (303) is fixedly connected to the outer wall of the support column (301); a motor (304) is fixedly connected to the top of the outer wall of the base plate (302); a rotating shaft (305) is provided at the output end of the motor (304); a second bevel gear (306) is fixedly connected to one end of the outer wall of the rotating shaft (305), and the second bevel gear (306) meshes with the first bevel gear (303).

4. The dental chair lumbar and hip support adjustment device for implant surgery according to claim 3, characterized in that, The support column (301) includes a circular shell (3011) and a circular column (3012); the outer side wall of the circular column (3012) is slidably connected to the inner side wall of the circular shell (3011); a first hydraulic cylinder (3013) is fixedly connected to the top of the outer wall of the base plate (302); a connecting ring (3014) is fixedly connected to the output end of the first hydraulic cylinder (3013), and the ring is rotatably connected to the circular column (3012).

5. The dental chair lumbar and hip-fitting backrest adjustment device for implant surgery according to claim 4, characterized in that, A second hydraulic cylinder (207) is fixedly connected to the inner surface of the fixed frame (101); a connecting plate (208) is fixedly connected to the output end of the second hydraulic cylinder (207); a lifting plate (209) is fixedly connected to the top of the outer wall of the connecting plate (208); the lifting plate (209) fits into the inner side wall of the fixed frame (101).

6. The dental chair lumbar and hip-fitting backrest adjustment device for implant surgery according to claim 5, characterized in that, The fixing frame (101) is equipped with a controller; the controller is electrically connected to the drive device (201) and the second hydraulic cylinder (207) respectively; a flexible pressure sensor array is fixedly installed in the embedded mounting cavity on the side of the backrest (204) facing away from the patient; the flexible pressure sensor array is electrically connected to the controller and is used to collect the patient's back contact pressure data and output the pressure distribution matrix to the controller.

7. The dental chair lumbar and hip support adjustment device for implant surgery according to claim 6, characterized in that, An angle sensor is coaxially fixed at the rotating connection shaft end of the swing frame (102) and the fixed frame (101); the angle sensor is electrically connected to the controller and is used to collect the pitch angle of the swing frame (102) and output attitude angle parameters to the controller; the controller generates an attitude correction pressure matrix based on the pressure distribution matrix and attitude angle parameters.

8. The dental chair lumbar and hip support adjustment device for implant surgery according to claim 7, characterized in that, A tension sensor is fixedly installed on the outer wall of the first pull rod (202) near the end of the rod that is connected to the swing frame (102); the tension sensor is electrically connected to the controller and is used to collect the force data of the first pull rod (202) and output the link load parameters to the controller; the controller constructs the waist-hip fit state vector based on the attitude correction pressure matrix and the link load parameters, and outputs the target compensation displacement through the pre-trained support vector regression model.

9. A dental chair lumbar and hip-fitting backrest adjustment device for implant surgery according to claim 8, characterized in that, A linear displacement sensor is fixedly installed at the center of the bottom of the lifting plate (209); the linear displacement sensor is electrically connected to the controller and is used to collect the real-time lifting displacement of the lifting plate (209) relative to the fixed frame (101) and output the height compensation parameters to the controller.

10. A dental chair lumbar and hip-fitting backrest adjustment device for implant surgery according to claim 9, characterized in that, The controller fuses the height compensation parameters with the waist-hip fit state vector to generate a multi-source feature matrix, predicts the body shape matching coefficient through the constructed adaptive neural network model, and dynamically corrects the target compensation displacement based on the body shape matching coefficient to generate an optimized compensation displacement; the optimized compensation displacement serves as the collaborative control input of the drive device (201) and the second hydraulic cylinder (207).

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