Ultraviolet phototherapy dosage control system and method based on photosensitive material

Abstract

The invention discloses an ultraviolet phototherapy dose control system and method based on a photosensitive material, and the system comprises an ultraviolet light source module, a photosensitive detection unit, an optical collection unit, a core control unit, a man-machine interaction unit, and an alarm and reset unit. The optical detection unit collects optical signals of the test paper in real time, the control unit compares the signals with a target dose threshold value and controls a light source to be started and stopped, and the method comprises the steps of target setting, synchronous irradiation monitoring, threshold value comparison execution and alarm reset. The real dose fed back by the photosensitive material is used as a control target, closed-loop control can be constructed by automatically adapting to the problem of irradiance attenuation caused by long-term use of the ultraviolet lamp tube, accurate dose control is achieved, treatment safety and consistency are improved, the operation process is simplified, and the equipment state can be indirectly diagnosed.

Description

Technical Field

[0001] This invention belongs to the field of dermatological medical device technology, specifically relating to an ultraviolet phototherapy dose control system and method based on photosensitive materials. Background Technology

[0002] Ultraviolet phototherapy is a mature and effective clinical treatment for chronic skin diseases such as psoriasis and vitiligo. Its therapeutic effect is directly related to the cumulative dose of ultraviolet light received by the skin (usually expressed as the product of irradiance and irradiation time). Precise dose control is the core prerequisite for ensuring the therapeutic effect and safety.

[0003] Existing ultraviolet phototherapy devices on the market mainly use an open-loop timed control mode for dosage control. This mode has two major, insurmountable drawbacks: Firstly, the treatment is highly dependent on manual operation and subjective judgment. Existing equipment essentially only has a timer function, requiring operators to manually set the irradiation time based on doctor's advice or past experience. During this process, operators are prone to forgetting to turn off the equipment in time due to distraction, other commitments, or simply forgetfulness, leading to excessive skin irradiation and adverse photodamage reactions such as burns, erythema, and blistering. Conversely, some patients may prematurely terminate treatment out of concern for over-irradiation, resulting in insufficient actual dose received, failing to reach the effective treatment response threshold, and consequently leading to prolonged treatment, poor efficacy, or even treatment failure. Even with devices featuring countdown timers and automatic shut-off, in special circumstances, incorrect irradiation time or intensity settings by the operator can also cause the aforementioned adverse photodamage reactions, or lead to prolonged treatment, poor efficacy, or even treatment failure due to insufficient irradiation time or intensity.

[0004] Secondly, the degradation of equipment performance cannot be perceived or compensated for. As a core consumable component of the equipment, the output irradiance of the ultraviolet lamp irreversibly decreases with increasing usage frequency and accumulated usage time. A brand-new lamp may output several times more ultraviolet energy than a lamp used for hundreds of hours in the same amount of time, and this degradation cannot be directly perceived by the naked eye. Patients often continue the initially set irradiation time, leading to a significant reduction in the actual dose received after the equipment ages, and a gradual decline in treatment effectiveness. At this point, it is difficult for both doctors and patients to quickly pinpoint the root cause of the problem, and it is easy to misjudge it as disease progression or the development of drug resistance, thus misleading adjustments to the treatment plan. Summary of the Invention

[0005] The purpose of this invention is to provide an ultraviolet phototherapy dosage control system and method based on photosensitive materials to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an ultraviolet phototherapy dosage control system based on photosensitive materials, comprising: The ultraviolet light source module includes a medical-grade ultraviolet lamp and a light source driving circuit. The ultraviolet lamp is selected as a UVA lamp or a 311nm narrow-spectrum UVB lamp, with a power range of 20-50W and an adjustable irradiance range of 5-20mW / cm². The light source driving circuit is electrically connected to the control unit and is used to receive the driving signal from the control unit to realize the lighting and turning off of the lamp. The photosensitive detection unit consists of disposable photosensitive test strips and a dedicated slot. The photosensitive test strips are made of a flexible PET substrate or a paper substrate with a substrate thickness of 0.05-0.2 mm and are coated with a photochromic material. The optical characteristic parameters of the photochromic material have a unique and stable correspondence with the cumulative dose of ultraviolet light received. The dedicated slot is set in the irradiation area of ​​the ultraviolet light source, and the position of the slot is kept on the same irradiation plane and at the same irradiation distance as the patient's treatment site, ensuring that the photosensitive test strip and the treatment site receive equivalent ultraviolet irradiation. An optical acquisition unit, comprising an optical sensor, a signal conditioning circuit, and an AD converter, wherein the optical sensor is an RGB color sensor or a miniature spectrometer, the sampling frequency is set to 5 to 20 times / second, and the detection accuracy is ±1 RGB value or ±0.01 absorbance unit; The core control unit adopts an embedded microcontroller, which is an STM32 series or equivalent processor with a main frequency of not less than 48MHz and a built-in AD conversion module with 12-bit or higher precision. A human-computer interaction unit, comprising a display module and an input module; An alarm and reset unit is provided, which consists of an audible and visual alarm module and a reset circuit. The audible and visual alarm module includes a buzzer and an LED indicator, which are used to issue an audible and visual prompt for 3 to 5 seconds when treatment is completed or an abnormal state is detected.

[0007] Preferably, the signal conditioning circuit is used to filter and amplify the analog signal output by the sensor, and the AD converter converts the conditioned analog signal into a digital signal and transmits it to the control unit. By conditioning and converting the sensor signal into an analog signal, the core control unit can be ensured to receive accurate and stable detection signals.

[0008] The core control unit integrates a signal processing module, a threshold comparison module, and a drive control module. The signal processing module performs noise reduction processing on the digital signal output by the optical acquisition unit. The threshold comparison module compares the processed real-time optical signal with the preset threshold corresponding to the target dose in real time. The drive control module outputs start / stop control signals to the ultraviolet light source module based on the comparison results. Through the division of labor among the internal modules of the core control unit, a closed-loop logic from signal processing to light source control is realized, ensuring the accurate execution of dose control.

[0009] Preferably, the display module is a touch screen or LCD screen, used to display the target dose, actual irradiation dose, dose achievement rate and equipment working status in real time. The input module adopts touch screen buttons, physical buttons or mobile APP communication interface, supporting target dose setting and treatment start and stop operations within the range of 0.1 to 10 J / cm². By clearly defining the form and function of the human-computer interaction module, convenient setting of treatment parameters and intuitive monitoring of the treatment process can be achieved.

[0010] Preferably, the abnormal states include photosensitive test strip not placed, ultraviolet light source failure, and optical signal abnormality. The reset circuit is used to automatically trigger the system to reset to standby state when the photosensitive test strip is removed after treatment. By clarifying the abnormal state types and alarm and reset mechanisms, the system's safety is improved and rapid reset and readiness are achieved after treatment.

[0011] Preferably, the distance between the optical sensor and the photosensitive test strip is set to 5-15 mm, and the detection optical path of the optical sensor is perpendicular to the surface of the photosensitive test strip. The optical path range of the optical sensor completely covers the effective photosensitive area of ​​the photosensitive test strip. By optimizing the spatial parameters of optical acquisition, the accuracy and reliability of optical signal acquisition from the photosensitive test strip are ensured.

[0012] A method for controlling ultraviolet phototherapy dosage based on photosensitive materials, applied to the aforementioned ultraviolet phototherapy dosage control system based on photosensitive materials, specifically includes the following steps: S1. System Initialization and Parameter Configuration: After power-on, the system automatically completes a hardware self-test, including the status detection of the ultraviolet light source, optical acquisition unit, and sensors. After passing the self-test, it enters standby mode. The user inputs the target dose value through the human-machine interaction unit. The core control unit calls the built-in "dose-optical signal" calibration curve to convert the target dose into the corresponding optical signal threshold. The calibration curve is determined through pre-experimentation and covers the corresponding relationship of optical characteristic parameters within the dose range of 0.1 to 10 J / cm². The user places a brand-new photosensitive test strip into the dedicated slot. After the test strip detection sensor confirms that it is in place, the optical acquisition unit collects the initial optical signal and records it as the reference value. The system displays the "ready" status. S2. Synchronous Irradiation and Real-time Monitoring: After the user triggers the treatment start command, the core control unit illuminates the ultraviolet light source through the drive circuit to achieve synchronous irradiation of the patient's treatment site and the photosensitive test strip. The optical acquisition unit continuously acquires the optical signal of the photosensitive test strip at a set sampling frequency of 5 to 20 times / second. The acquired signal is filtered, amplified, and converted by AD before being transmitted to the core control unit. The control unit calculates the current cumulative dose and dose achievement rate in real time and displays them dynamically through the human-computer interaction unit. S3. Threshold Comparison and Precise Control: The core control unit continuously compares the real-time optical signal with the preset threshold. If the threshold is not met and there is no abnormality, the irradiation is maintained; if the threshold is met, the light source is turned off; if the test strip falls off or the light source power is abnormal, the light source is immediately turned off and an alarm is triggered. S4. Treatment Termination and Data Processing: After the light source is turned off, the core control unit triggers the audible and visual alarm module to issue a treatment completion prompt. The human-machine interaction unit displays the target dose, actual dose, and irradiation time. The storage module automatically records the treatment data. The system maintains the current state until the user removes the photosensitive test strip. After the test strip is removed, the reset circuit triggers the system to reset and enter the standby state for the next treatment. Through a four-step process, the entire process from system preparation, treatment monitoring, precise light control to treatment completion is controlled, ensuring accurate dosage and safe and controllable treatment.

[0013] Preferably, in step S1, the "dose-optical signal" calibration curve is obtained in the following way: a standard ultraviolet dosimeter is used to simultaneously irradiate the photosensitive test paper, 10 dose gradients are set in the range of 0.1 to 10 J / cm², and the irradiation experiment is repeated 3 times for each gradient. The optical characteristic parameters of the photosensitive test paper at each dose are collected, and the correspondence curve between dose and optical parameters is established by linear fitting or polynomial fitting. The curve is then stored in the storage module of the core control unit, providing a scientific method for obtaining the calibration curve, establishing a precise correspondence between dose and optical signal, and providing core data support for precise dose control.

[0014] Compared with the prior art, the beneficial effects of the present invention are: (1) By constructing a closed-loop control mechanism based on the feedback of photosensitive materials, the actual cumulative dose is used as the core basis for stopping irradiation. This fundamentally avoids the risk of excessive irradiation caused by distraction, forgetfulness of operation or subjective intervention in the manual timing mode, effectively reducing the occurrence of adverse reactions such as burns and erythema. At the same time, the system has set up sound and light alarm functions for scenarios such as the photosensitive test strip not being placed or the light source working abnormally, forming multiple safety defenses, providing active safety protection for the treatment process, and enhancing the sense of security of both doctors and patients.

[0015] (2) Abandoning the traditional open-loop control logic based on time, the closed-loop control logic uses the optical change signal of the photosensitive test strip as the decision basis for controlling the opening and closing of the ultraviolet light source. With the real dose fed back by the photosensitive material as the control target, it can automatically adapt to the problem of irradiance decay caused by long-term use of ultraviolet lamps. Whether the lamp is in a brand new state or in the later stage of use, it can ensure that the ultraviolet dose received by the patient's skin during each treatment is accurate and meets the treatment needs. It avoids poor efficacy and prolonged treatment course due to insufficient dose, or recurrence of the condition due to dose fluctuation, effectively improving the stability of treatment effect and reducing the probability of misjudgment of efficacy fluctuation by both doctors and patients.

[0016] (3) Users do not need to manually calculate the irradiation time based on lamp parameters and usage duration. They only need to directly input the target dose recommended by the doctor through the human-computer interaction unit to start the treatment, which greatly reduces the reliance on the professional skills of the operator. It is especially suitable for home treatment by non-professionals or use in primary medical institutions. The real-time feedback on the dose achievement progress during the treatment process allows users to clearly grasp the treatment dynamics, reduce anxiety during the waiting process, and improve the overall treatment experience.

[0017] (4) By recording the trend of irradiation duration changes when the target dose is achieved each time, the system can indirectly sense the performance degradation status of the ultraviolet lamp tube, providing an intuitive basis for equipment maintenance. Through this proactive performance monitoring function, the system can provide early warning of lamp replacement time, avoid ineffective treatment due to lamp degradation, reduce the probability of sudden equipment failure, extend the overall service life of the equipment, and reduce equipment operation and maintenance costs and management difficulty. Attached Figure Description

[0018] Figure 1 This is a system block diagram of the present invention; Figure 2 This is a flowchart of the method of the present invention. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0021] The following combination Figures 1 to 2 The present invention will be further described; I. System Hardware Configuration This embodiment is designed for primary healthcare institutions and home-based treatment scenarios. The selection of each hardware module in the system takes into account reliability, cost-effectiveness, and ease of operation. Specific configuration and design details are as follows: 1. Ultraviolet Light Source Module Configuration: A 311nm narrow-spectrum UVB lamp is selected. This wavelength is clinically validated as the optimal band for treating psoriasis and vitiligo, ensuring efficacy while reducing the risk of photodamage. The power is set to 30W, with an adjustable irradiance range of 5-15mW / cm² to meet the dosage requirements of different skin lesion types (e.g., acute and stable phases) and patient skin photosensitivity. The light source drive circuit adopts a constant current drive design and is equipped with overcurrent and overtemperature protection chips. It automatically cuts off power when the lamp operating temperature exceeds 60℃ or the current is abnormal to prevent equipment damage. The lamp is equipped with a quartz glass lampshade, combining light transmission and protection. The lampshade edge is designed with a detachable structure for easy regular cleaning and lamp replacement. The light source is installed in an adjustable treatment head, which can rotate 0-90° around the horizontal axis and has a vertical height adjustment range of 50-120cm to adapt to different treatment areas (e.g., trunk, limbs, head).

[0022] 2. Photosensitive detection unit configuration: The photosensitive test strip uses a 0.1mm thick PET substrate, which has better weather resistance and flatness compared to paper substrates, avoiding detection errors caused by test strip wrinkles during treatment; the surface is coated with a spiropyran-based photochromic coating, which has high sensitivity to the 311nm UVB band and good stability of color change, avoiding fading after light exposure and affecting detection accuracy; The test strip is designed to be 2cm × 3cm in size, with an effective photosensitive area of ​​1.5cm × 2.5cm. Positioning holes are set on the edge, which work in conjunction with the raised structure of the dedicated slot to achieve precise positioning. The dedicated slot is integrated under the treatment head, and the distance between it and the light source is fixed at 20cm. An elastic pressure plate is set in the slot to fix the test strip, ensuring that the test strip and the patient's treatment site are on the same irradiation plane (i.e., at the same height as the light source), and the distance deviation between the two and the light source does not exceed ±0.5cm, ensuring consistent ultraviolet radiation intensity. A photoelectric sensor is embedded on the side of the slot. When the test strip is correctly placed, the sensor is blocked and triggers a signal, feeding back the "test strip ready" status to the control unit.

[0023] 3. Optical acquisition unit configuration: The TCS34725 RGB color sensor is selected. This sensor integrates an infrared filter, which can effectively filter out infrared interference caused by ambient light and heat from the light source, improving the detection accuracy to ±1 RGB value; the sampling frequency is set to 10 times / second, which can capture the color change of the test strip in real time, while avoiding overload of the control unit's computing power caused by high-frequency sampling. The sensor is mounted 10mm directly above the slot via a bracket. The detection light path is perpendicular to the test strip surface, with a diameter of 1cm, completely covering the effective photosensitive area of ​​the test strip and avoiding errors caused by detection of edge areas. The signal conditioning circuit consists of a low-pass filter circuit and an instrumentation amplifier. The low-pass filter circuit filters out 50Hz power frequency interference, and the instrumentation amplifier amplifies the weak analog signal output by the sensor by 100 times to ensure accurate acquisition by the AD converter. The AD converter uses a 12-bit precision chip, and the sampling rate is synchronized with the sensor. It converts the analog signal into a digital signal of 0-4095 and transmits it to the control unit.

[0024] 4. Core Control Unit Configuration: An STM32F103 microcontroller with a 72MHz clock speed is used as the main control chip, providing sufficient computing power to process optical signals, drive peripherals, and execute control logic. A built-in 12-bit AD converter is provided as a backup, automatically switching in case of external AD converter failure, enhancing system redundancy. The control unit is externally expanded with a 16GB Flash storage module to store the "dose-optical signal" calibration curve, 1000 sets of treatment data, and equipment operation logs. A USB 2.0 interface is provided, supporting data export to a computer for statistical analysis. The control unit communicates with the light source drive circuit and optical acquisition unit via a 485 bus, with a transmission distance of up to 10 meters, adapting to the split design of treatment equipment (such as a separate treatment head and main unit). A Bluetooth module is also integrated, supporting connection to a mobile app for remote parameter setting and treatment data viewing.

[0025] 5. Human-Machine Interaction and Alarm Reset Unit Configuration: The human-machine interaction unit adopts a 2.4-inch capacitive touch screen that supports multi-touch. The interface design is divided into three main menus: "Treatment Mode", "Data Query", and "Device Settings". The "Treatment Mode" interface displays the target dose, current dose, achievement rate, and countdown in real time. The "Data Query" interface allows users to search for historical treatment records by date. In addition to the touch screen, the input module has three physical buttons (start, pause, and emergency stop). The emergency stop button has a raised red design for easy operation in emergencies. The alarm unit consists of a 5V buzzer and a three-color LED indicator. When the treatment is completed, the buzzer emits a "beep" sound and the green LED stays on. If the test strip is not placed or the light source is faulty, the buzzer will sound an alarm continuously and the red LED will flash. When the device passes the self-test, the yellow LED will flash three times and then turn off. The reset circuit adopts a photoelectric sensor design. When the test strip is removed from the slot, the photoelectric sensor triggers a reset signal, the control unit clears the treatment data, and returns to the standby state.

[0026] II. Actual Operation Procedure This embodiment focuses on the treatment of psoriasis patients in primary healthcare institutions, while also considering the need for simplified home treatment. The specific operation process is divided into three stages: pre-treatment preparation, treatment execution, and post-treatment care. The detailed steps are as follows: 1. Pre-treatment preparation stage: ① Equipment self-test: After the medical staff connects the power, the system automatically starts the self-test process. The control unit sequentially checks the status of the light source, sensor, touch screen and storage module. After the self-test is passed, the LED yellow light flashes 3 times and the touch screen displays "standby ready"; if a component fails, the screen displays the fault code (such as "E01" representing light source failure) and the buzzer alarms. ② Parameter setting: The doctor sets the target dose to 1.5J / cm² based on the patient's skin lesion area (such as the size of a palm, about 1% of the body surface area) and disease course (the starting dose is lower in the acute phase). Medical staff input this value through the touch screen, and the system automatically calls the pre-stored calibration curve to convert the target dose into an RGB threshold (110,110,110) and displays it. ③ Test strip installation and patient preparation: Medical staff take out a brand new photosensitive test strip, check that the test strip is undamaged and has a uniform color (initially white), insert it into the slot positioning hole, trigger the photoelectric sensor on the side of the slot, and the screen displays "Test strip ready"; assist the patient to wear goggles (to avoid ultraviolet radiation to the eyes), expose the skin lesion area, adjust the angle and height of the treatment head so that the skin lesion area and the test strip in the slot are on the same plane, and the distance from the light source is 20cm. Use a light-blocking cloth to cover non-treatment areas.

[0027] 2. Treatment execution phase: ① Treatment initiation: After confirming that the patient is in a comfortable position and properly protected, the medical staff presses the "Start" button on the touch screen or the physical start button. The system emits a "beep" sound, the ultraviolet light source lights up, the screen displays "Treatment in progress," and the dosage achievement rate is updated in real time (gradually increasing from 0%).

[0028] ② Real-time monitoring and control: The optical acquisition unit collects the RGB values ​​of the test strip 10 times per second. After signal conditioning, the data is transmitted to the control unit. The control unit processes the data through a moving average filtering algorithm to eliminate ambient light interference. When the treatment has been going on for 40 seconds, the RGB values ​​of the test strip drop to (110, 110, 110), reaching the preset threshold. The control unit immediately sends a shutdown signal, and the light source is turned off within 0.1 seconds.

[0029] ③ Abnormal handling: If the patient moves accidentally during treatment and the test strip falls off, the card slot photoelectric sensor will send a "test strip missing" signal. The system will immediately turn off the light source, the buzzer will sound an alarm continuously, and the screen will display "Please check the test strip". Pressing the "pause" button will pause the treatment for a maximum of 30 seconds. If the treatment is not resumed within the time limit, the treatment will be automatically terminated and the dose already irradiated will be recorded.

[0030] 3. Post-treatment processing stage: ① Treatment completion prompt: After the light source is turned off, the buzzer emits a 3-second "beep" prompt sound, the LED green light stays on, the screen displays "treatment completed", and simultaneously displays the target dose of 1.5J / cm², the actual dose of 1.5J / cm², and the irradiation time of 40 seconds. The storage module automatically records the treatment information (date, time, dose, equipment status).

[0031] ② Patient and equipment setup: Medical staff assist the patient in removing goggles, tidying up clothing, and informing them to avoid sun exposure for 24 hours after treatment; remove the used test strip (which has turned dark blue), the system detects the removal of the test strip and automatically resets, the screen returns to the "standby ready" state; clean the lamp tube, lamp cover and treatment head surface, and turn off the power.

[0032] 4. Equipment Attenuation Compensation Scenario Operation: After the lamp has been used for 1000 hours, the irradiance decreases due to performance degradation. When the target dose of 1.5J / cm² is set again for the same patient, the system detects a slowdown in the color change rate of the test strip through the optical acquisition unit and automatically extends the irradiation time to 80 seconds to ensure that the RGB value of the test strip reaches the threshold (110,110,110). The actual dose is still 1.5J / cm². At this time, the "Device Settings" interface on the screen will prompt "Lamp attenuation rate 50%, replacement recommended". Medical staff can export the irradiation time change curve through the USB interface as a basis for lamp replacement.

[0033] 5. Home Treatment Adaptation: When used at home, patients receive the target dosage from their doctor via a mobile app, which automatically syncs to the device. The device features a "child lock" function, requiring a preset password to modify dosage parameters. During treatment, the app synchronizes the treatment progress in real time and sends reminder messages to both the patient and doctor upon completion. Historical treatment data is automatically uploaded to the cloud, allowing doctors to remotely track treatment effectiveness and adjust treatment plans.

[0034] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A phototherapy dosage control system based on photosensitive materials, characterized in that, include: An ultraviolet light source module, comprising a medical-grade ultraviolet lamp and a light source driving circuit, wherein the light source driving circuit is electrically connected to a control unit and is used to receive driving signals from the control unit to turn the lamp on and off. A photosensitive detection unit, comprising disposable photosensitive test strips and a dedicated card slot, wherein the photosensitive test strips are made of a flexible PET substrate or a paper substrate, and the dedicated card slots are located within the irradiation area of ​​an ultraviolet light source; An optical acquisition unit, comprising an optical sensor, a signal conditioning circuit, and an AD converter, wherein the optical sensor is selected as an RGB color sensor or a miniature spectrometer; The core control unit adopts an embedded microcontroller; A human-computer interaction unit, comprising a display module and an input module; An alarm and reset unit, consisting of an audible and visual alarm module and a reset circuit, is used to issue an audible and visual alert when treatment is completed or an abnormal state is detected. The audible and visual alarm module includes a buzzer and an LED indicator.

2. The ultraviolet phototherapy dosage control system based on photosensitive materials according to claim 1, characterized in that: The signal conditioning circuit is used to filter and amplify the analog signal output by the sensor, and the AD converter converts the conditioned analog signal into a digital signal and transmits it to the control unit.

3. The ultraviolet phototherapy dosage control system based on photosensitive materials according to claim 1, characterized in that: The core control unit integrates a signal processing module, a threshold comparison module, and a drive control module. The signal processing module performs noise reduction processing on the digital signal output by the optical acquisition unit. The threshold comparison module compares the processed real-time optical signal with the preset threshold corresponding to the target dose in real time. The drive control module outputs a start / stop control signal to the ultraviolet light source module based on the comparison result.

4. The ultraviolet phototherapy dosage control system based on photosensitive materials according to claim 1, characterized in that: The display module is a touch screen or LCD screen, used to display the target dose, actual irradiation dose, dose achievement rate and equipment working status in real time. The input module adopts touch screen buttons, physical buttons or mobile APP communication interface.

5. The ultraviolet phototherapy dosage control system based on photosensitive materials according to claim 1, characterized in that: The abnormal states include photosensitive test strip not being placed, ultraviolet light source failure, and optical signal abnormality. The reset circuit is used to automatically trigger the system to reset to standby state when the photosensitive test strip is removed after treatment.

6. The ultraviolet phototherapy dosage control system based on photosensitive materials according to claim 1, characterized in that: The distance between the optical sensor and the photosensitive test paper is set to 5-15 mm, and the detection optical path of the optical sensor is perpendicular to the surface of the photosensitive test paper. The optical path range of the optical sensor completely covers the effective photosensitive area of ​​the photosensitive test paper.

7. A method for controlling ultraviolet phototherapy dosage based on photosensitive materials, characterized in that, The method is applied to the ultraviolet phototherapy dose control system based on photosensitive materials as described in any one of claims 1-6, characterized in that the ultraviolet phototherapy dose control method based on photosensitive materials specifically includes the following steps: S1. System Initialization and Parameter Configuration: After power-on, the system automatically completes a hardware self-test, including the status detection of the ultraviolet light source, optical acquisition unit, and sensors. After passing the self-test, it enters the standby state. The user inputs the target dose value through the human-machine interaction unit. The core control unit calls the built-in dose-optical signal calibration curve to convert the target dose into the corresponding optical signal threshold. The user places a new photosensitive test strip into the dedicated slot. After the test strip detection sensor confirms that it is placed in place, the optical acquisition unit collects the initial optical signal and records it as the reference value. The system displays the ready state. S2. Synchronous Irradiation and Real-time Monitoring: After the user triggers the treatment start command, the core control unit illuminates the ultraviolet light source through the drive circuit to achieve synchronous irradiation of the patient's treatment site and the photosensitive test strip. The collected signal is filtered, amplified and converted by AD and then transmitted to the core control unit. The control unit calculates the current cumulative dose and dose achievement rate in real time and displays them dynamically through the human-computer interaction unit. S3. Threshold Comparison and Precise Control: The core control unit continuously compares the real-time optical signal with the preset threshold. If the threshold is not met and there is no abnormality, the irradiation is maintained; if the threshold is met, the light source is turned off; if the test strip falls off or the light source power is abnormal, the light source is immediately turned off and an alarm is triggered. S4. Treatment Termination and Data Processing: After the light source is turned off, the core control unit triggers the audible and visual alarm module to issue a treatment completion prompt. The human-machine interaction unit displays the target dose, actual dose, and irradiation time. The storage module automatically records the treatment data. The system maintains the current state until the user removes the photosensitive test strip. After the test strip is removed, the reset circuit triggers the system to reset and enter the standby state for the next treatment.

8. The method for controlling ultraviolet phototherapy dosage based on photosensitive materials according to claim 7, characterized in that: In S1, the dose-optical signal calibration curve is obtained in the following way: a standard ultraviolet dosimeter is used to simultaneously irradiate the photosensitive test paper, 10 dose gradients are set in the range of 0.1 to 10 J / cm², and the irradiation experiment is repeated 3 times for each gradient. The optical characteristic parameters of the photosensitive test paper at each dose are collected, and the correspondence curve between dose and optical parameters is established by linear fitting or polynomial fitting, and stored in the storage module of the core control unit.

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