Active patient-triggered and multi-modal feedback-based upright tilt table test safety control system

Abstract

The utility model relates to medical equipment technical field, concretely for based on patient active trigger and multimode feedback's upright tilt experiment safety control system, including patient trigger module, operator control module, collaborative feedback control module and tilt bed actuating mechanism. The patient can through wireless handheld button active trigger tilt bed lay flat, and button is equipped with long press identification, vibration feedback and low power prompt function. Control module according to patient signal, operator response and vital sign monitoring result, according to preset priority logic execution fast or slow lay flat, and support graded early warning and countdown interaction. The system is also provided with emergency stop rope and identity verification mechanism, and the operation safety is improved. The system can be widely applied to the tilt test scene such as neuroregulatory syncope screening, postural hypotension diagnosis, has the advantages of responding in time, high safety, good man-machine cooperation.

Description

Technical Field

[0001] This utility model relates to the field of medical equipment technology, and in particular to a safety control system for upright tilt experiments based on patient active triggering and multimodal feedback. Background Technology

[0002] The tilt table test is a standardized diagnostic method used to assess circulatory system dysfunctions such as neurogenic syncope and orthostatic hypotension. In clinical practice, this test involves gradually tilting the patient from a supine position to a specific angle (e.g., 60°–80°) while continuously monitoring changes in vital signs such as heart rate and blood pressure to determine whether autonomic dysfunction or hemodynamic abnormalities have occurred.

[0003] Existing upright tilt table testing systems mainly consist of an electrically operated tilting bed, vital sign monitoring equipment, and a control interface. During the experiment, medical staff observe data such as electrocardiograms and blood pressure fluctuations collected by the instruments to determine if any abnormalities are present, and manually operate the control panel to return the tilting bed to a horizontal position when necessary. However, existing technologies generally suffer from the following prominent problems:

[0004] Lack of patient-initiated input mechanisms: Traditional systems rely entirely on doctors' judgments and objective physiological data collected by instruments, failing to recognize subjective symptoms of discomfort experienced by patients (such as dizziness, palpitations, and blurred vision). In fact, some patients experience prodromal symptoms of syncope before exhibiting obvious physiological abnormalities, and existing systems cannot respond promptly, posing significant safety risks.

[0005] The response mechanism is simplistic and relies heavily on the speed of medical staff's actions. In practice, due to delays or distractions among medical personnel, critical reaction opportunities may be missed, resulting in the bed not being leveled in time, increasing the risk of patient fainting or falling. The existing system lacks a proactive safety loop and has poor fault tolerance.

[0006] The control logic is simple and lacks multi-level early warning and hierarchical processing capabilities: most devices only activate the protection mechanism when vital signs reach a single critical threshold, which cannot achieve step-by-step intervention. The early warning response is relatively crude and is prone to false alarms, missed alarms or over-leveling.

[0007] Insufficient information prompts and lack of real-time interactive feedback in the user interface: Existing control systems mostly use simple display instruments or basic monitoring platforms, lacking interactive interface design, and cannot intuitively present information such as the current patient status, risk level, and countdown, which is not conducive to medical staff making quick decisions.

[0008] The system has weak safety redundancy and lacks physical safety protection measures after electronic failures: in extreme cases such as motor failure or system crash, the existing equipment cannot guarantee rapid manual power-off recovery, and potential dangers still exist.

[0009] In summary, existing upright tilting experimental control systems have significant shortcomings in terms of subjective participation capability, human-computer interaction response efficiency, control logic refinement, and safety redundancy structure. There is an urgent need for a multimodal feedback system that can integrate patient active input, medical staff operation response, vital sign classification monitoring, and intelligent control to improve the overall safety, sensitivity, and intelligence level of the experiment. Utility Model Content

[0010] To achieve the above objectives, this utility model discloses a safety control system for upright tilt test based on patient active triggering and multimodal feedback. This system can be widely used in tilt test scenarios such as screening for neuromodulation syncope and diagnosis of orthostatic hypotension, and has the advantages of timely response, high safety, and good human-machine collaboration.

[0011] This utility model adopts the following technical solution: a safety control system for upright tilt experiments based on patient active triggering and multimodal feedback, comprising:

[0012] A patient triggering module, the patient triggering module includes a wireless handheld button, the wireless handheld button is provided with a long press triggering structure, a low battery indicator light and a vibration feedback component, and is connected to the main control module through a low power wireless communication module;

[0013] An operator control module includes a control panel with a display screen, a physical emergency stop button, and embedded software control buttons. The display screen is used to display vital signs, warning level, and countdown prompts.

[0014] A collaborative feedback control module, integrated into the main control unit, is used to receive patient button signals, operator control signals, and vital sign sensor output signals, and control the tilting bed movement according to priority logic.

[0015] An inclined bed actuator, comprising an electric push rod assembly, an angle sensor, and a bed structure, is capable of rapid or slow leveling and transmits bed tilt angle data to a control panel in real time via a feedback circuit.

[0016] The wireless handheld button features a non-slip grip, Braille positioning markings on its surface, and a physical switch structure that triggers when pressed for 2 to 3 seconds.

[0017] The control panel features a touchscreen display area that includes a vital signs trend curve area, a warning line indicator area, and a 15-second countdown progress bar area.

[0018] The collaborative feedback control module is equipped with a priority logic circuit, and its output control logic is as follows: the patient trigger signal takes priority over the automatic leveling signal, and the automatic leveling signal takes priority over the operator control signal.

[0019] The electric push rod of the inclined bed actuator has two driving modes:

[0020] Quick flattening mode, drive speed is 10° / second;

[0021] Slow-speed flattening mode, drive speed is 5° / second.

[0022] The system also includes a vital signs monitoring module, which includes sensors for collecting heart rate and blood pressure data. These sensors are connected to the collaborative feedback control module via data cables.

[0023] The wireless handheld button uses a mechanism of three consecutive signal transmissions and CRC verification to ensure the validity of the trigger signal and avoid accidental activation.

[0024] The inclined bed is equipped with a mechanical emergency stop rope on one side. The rope is connected to an independent power circuit breaker structure and is used to forcibly cut off the power supply to the electric push rod when the electronic system fails.

[0025] The operator control module includes an identity recognition device, which is either a magnetic card swiping module or a password input module, used to restrict operator permissions.

[0026] When the collaborative feedback control module receives a signal of abnormal vital signs and determines that it has reached the preset warning threshold, the control panel automatically switches the countdown prompt from 15 seconds to 10 seconds to improve the response speed.

[0027] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0028] Compared with existing upright and tilting experimental equipment, this invention has significant advantages in multiple dimensions such as safety, response mechanism, human-machine collaboration, control precision, and system fault tolerance.

[0029] Firstly, this system innovatively introduces a patient-initiated module, enabling subjective symptom input via a wireless handheld button. This allows patients to actively request the suspension of the trial and trigger bed flattening when experiencing discomfort such as dizziness, chest tightness, or palpitations, but whose vital signs are not yet significantly abnormal. This approach overcomes the limitation of existing technologies that rely solely on physiological parameters for judgment, effectively preventing risks such as fainting and falls caused by delayed flattening, and improving the level of patient safety and compliance during tilt table trials.

[0030] Secondly, this system implements a triple control logic of "patient → system → operator" through a collaborative feedback control module. Specifically, upon receiving a signal from the patient to press and hold the wireless button, the system immediately performs a rapid flattening action and simultaneously sends a prompt pop-up and a 15-second countdown to the control panel, allowing the operator to determine whether to stop the operation within the response time. If the operator does not respond, the system defaults to executing the patient's request. This mechanism significantly improves human-machine collaboration efficiency, ensuring rapid response while retaining a channel for human intervention, effectively integrating proactivity, responsiveness, and controllability, and avoiding the risks of delays or accidental touches that may result from relying entirely on manual or single-sensor judgment.

[0031] Furthermore, this invention constructs a multi-level early warning system, progressively linking changes in vital signs with leveling control. The system sets 90%, 95%, and 100% diagnostic criteria as three-level dividing lines, issuing different levels of warnings (such as yellow and red alerts) when different thresholds are reached. It also dynamically adjusts the operator's response time according to different levels (e.g., shortening it from 15 seconds to 10 seconds), ultimately automatically executing rapid leveling upon reaching the diagnostic criteria. Compared to the existing equipment's "single threshold triggering," this hierarchical safety mechanism has stronger adaptability and refined control capabilities, avoiding problems such as false triggering and overreaction while ensuring timely and scientific responses. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall design of this utility model;

[0033] Figure 2 This is a schematic diagram of the system architecture of this utility model;

[0034] Figure 3 This is a schematic diagram of the process after the patient presses the button according to this utility model. Detailed Implementation

[0035] Please see Figures 1-3 This utility model provides a technical solution: a safety control system for upright tilt experiments based on patient-initiated and multimodal feedback, comprising:

[0036] A patient triggering module, the patient triggering module includes a wireless handheld button, the wireless handheld button is provided with a long press triggering structure, a low battery indicator light and a vibration feedback component, and is connected to the main control module through a low power wireless communication module;

[0037] An operator control module includes a control panel with a display screen, a physical emergency stop button, and embedded software control buttons. The display screen is used to display vital signs, warning level, and countdown prompts.

[0038] A collaborative feedback control module, integrated into the main control unit, is used to receive patient button signals, operator control signals, and vital sign sensor output signals, and control the tilting bed movement according to priority logic.

[0039] An inclined bed actuator, comprising an electric push rod assembly, an angle sensor, and a bed structure, is capable of rapid or slow leveling and transmits bed tilt angle data to a control panel in real time via a feedback circuit.

[0040] Specifically:

[0041] The patient triggering module includes a wireless handheld button. This button has a long, rectangular structure, sized for easy one-handed grip, and its casing is made of a non-slip material. Braille positioning marks are provided on the outer surface of the button to facilitate accurate operation by visually impaired patients. The button features a physical long-press trigger mechanism, designed to be effective after a 2-3 second press to prevent accidental activation. The button also integrates a vibration feedback component to provide vibration confirmation when the user successfully triggers the button.

[0042] In addition, the button integrates a low-power Bluetooth or ZigBee wireless communication module to enable data communication with the main control module. To improve communication reliability, the button is equipped with a three-phase continuous signal transmission and CRC check mechanism to ensure that each trigger signal is verified before being transmitted to the control terminal.

[0043] The operator control module is located in the console area next to the tilting bed, including an embedded control panel that integrates a capacitive touch display, a physical emergency stop button, and software virtual buttons.

[0044] The display screen is divided into three main functional areas:

[0045] Real-time vital signs trend curve display area: used to display the current heart rate and blood pressure curve trends;

[0046] Warning line display area: It is equipped with 90%, 95%, and 100% diagnostic threshold lines for graded warning prompts;

[0047] Countdown progress bar area: Displays the remaining response time for the operator to cancel the command within 15 seconds (or 10 seconds) after the patient triggers it.

[0048] In addition, to enhance operational safety, the control module is equipped with an operator identification device, which uses magnetic card swiping or password verification to ensure that operation permissions are limited to authorized personnel.

[0049] The collaborative feedback control module, as the core logic center of the system, is located in the main control unit. It is responsible for integrating control input signals from patients, operators, and automatic system monitoring, and implementing a hierarchical response control strategy.

[0050] This module contains a priority determination circuit and a response logic control chip, and its control logic is as follows:

[0051] The trigger priority order is as follows:

[0052] ① Patient trigger signal > ② Automatic leveling signal > ③ Operator manual command;

[0053] Upon receiving a valid trigger signal from the patient, the system immediately issues a command to level the tilting bed (quick mode) and simultaneously sends a 15-second countdown prompt window to the operator via the control panel.

[0054] If the operator clicks "Cancel Leveling" before the countdown ends, the current leveling operation will be stopped and the event log will be automatically recorded.

[0055] If the operator does not respond within the countdown, the system will continue to perform the operation of flattening to 0°.

[0056] If the system detects that vital signs reach 90% of the diagnostic criteria, it triggers a Level 1 warning (yellow alert); when it reaches 95%, it triggers a Level 2 warning (red alert); and when it reaches 100% of the diagnostic criteria, it automatically levels itself. After entering the Level 1 or Level 2 warning stage, the system automatically reduces the operator's response time from 15 seconds to 10 seconds.

[0057] The inclined bed actuator directly adopts the existing upright inclined test bed, including the main body of the bed, electric push rod assembly, angle sensor and bed support structure.

[0058] The electric actuator assembly has two drive modes:

[0059] Fast mode: Drive speed of 10° / second, used for rapid lying-down response triggered by the patient or system automatically;

[0060] Slow mode: Drive speed is 5° / second, used for slow tilting movements when the operator makes manual adjustments.

[0061] The angle sensor is a high-precision digital gyroscope module with a measurement error of less than ±0.5°. It can acquire tilt angle information in real time and transmit it back to the control panel through a feedback circuit to ensure that the display and execution status are consistent.

[0062] To enhance safety in extreme situations, the tilting bed is equipped with a mechanical emergency stop rope on the left side, which is connected to an independent power cut-off device. In the event of electronic control system failure or an emergency, the patient or operator can pull the rope to directly cut off the power supply to the electric actuator, forcibly restoring the bed to a horizontal position.

[0063] The system is also equipped with a vital signs monitoring module, which includes a sensor array for collecting heart rate and blood pressure data and can be connected to the main control unit via wired or wireless means.

[0064] The collected data is transmitted to the collaborative feedback control module in real time, which determines whether the warning threshold has been reached and assists in the decision-making logic.

[0065] The working process of this system is as follows:

[0066] 1. Preparation and Initial State

[0067] Doctor A turns on the system's main power, the control panel starts up, and displays "standby" status;

[0068] Nurse B puts a blood pressure cuff, ECG patch or PPG wristband on the patient and connects the sensor cable to the vital signs monitoring module;

[0069] Doctor A lays the patient flat on the tilt bed, enters the patient's information through the control panel, and logs in by swiping a card. The identity authentication is successful.

[0070] The patient was told: "If you feel dizzy, have palpitations, or are sweating, press and hold the button in your hand for 3 seconds, and the system will immediately make the bed lie flat."

[0071] Nurse B handed the wireless handheld button to the patient, who held it naturally, and the screen displayed "Patient signal normal".

[0072] 2. Start the experiment

[0073] Doctor A pressed the "Start Tilting" button, and the system controlled the electric push rod to slowly tilt the bed to a 60° angle at a speed of 5° / second;

[0074] Vital signs data are collected in real time, and heart rate and blood pressure trend curves are plotted on the screen, with three warning lines of 90%, 95%, and 100% displayed.

[0075] The control panel displays "Current Status: Normal". Doctor A continues to communicate with the patient and observe their reactions.

[0076] 3. The patient experiences discomfort and triggers active protection.

[0077] After maintaining the tilt for about 5 minutes, the patient subjectively felt "chest tightness and blurred vision", but at this time the changes in heart rate and blood pressure had not yet reached the warning threshold;

[0078] The patient immediately presses and holds the wireless button for 3 seconds. The handheld device vibrates to confirm that the signal has been sent, and a red prompt window immediately pops up on the control panel: "The patient has actively requested to be laid flat."

[0079] At the same time, the screen starts a 15-second countdown, the progress bar flashes, and a message appears saying "Doctors can choose 'Cancel'";

[0080] After confirming the patient's condition, Doctor A did not intervene. After the countdown ended, the system automatically started the rapid flattening mode (10° / second), and the bed returned to a horizontal position within 3-4 seconds.

[0081] The system displays "Safely laid flat," the event log is automatically saved, and the patient feels comfortable and has recovered.

[0082] 4. The doctor observes the data and terminates the experiment.

[0083] During the synchronization process, the system continued to record the patient's vital signs, and no significant drop was observed, indicating that the subjective discomfort preceded the abnormality of objective data.

[0084] Doctor A clicked "Terminate Experiment," and the control panel displayed the message "Experimental data has been saved, please export."

[0085] The experiment is over.

[0086] 5. If the patient does not trigger the alert, the system will automatically enter the warning logic.

[0087] In another experiment, the patient did not actively trigger the button, but the system detected that the patient's systolic blood pressure had dropped by more than 30% from its baseline and the heart rate had dropped below 50 bpm. The control module then determined that the 95% warning threshold had been reached, triggering a level-two warning. The control panel flashed red and an alarm sounded to alert the doctor. At this time, the system automatically shortened the operator's countdown response time from 15 seconds to 10 seconds, improving response efficiency.

[0088] If the doctor still does not respond, the system automatically switches to the rapid flattening mode to perform flattening. All event information during this process, including signal source, response time, vital sign data, and tilt angle, is recorded in the data log.

[0089] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A safety control system for upright tilt experiments based on patient-initiated triggering and multimodal feedback, characterized in that, include: A patient triggering module, the patient triggering module includes a wireless handheld button, the wireless handheld button is provided with a long press triggering structure, a low battery indicator light and a vibration feedback component, and is connected to the main control module through a low power wireless communication module; An operator control module includes a control panel with a display screen, a physical emergency stop button, and embedded software control buttons. The display screen is used to display vital signs, warning level, and countdown prompts. A collaborative feedback control module, integrated into the main control unit, is used to receive patient button signals, operator control signals, and vital sign sensor output signals, and control the tilting bed movement according to priority logic. An inclined bed actuator, comprising an electric push rod assembly, an angle sensor, and a bed structure, is capable of rapid or slow leveling and transmits bed tilt angle data to a control panel in real time via a feedback circuit.

2. The system according to claim 1, characterized in that: The wireless handheld button has a non-slip grip, Braille positioning markings on its surface, and a physical switch structure that is triggered by pressing and holding for 2 to 3 seconds.

3. The system according to claim 1, characterized in that: The display screen on the control panel is a touch screen, and the display area includes: a vital signs trend curve area, a warning line indicator area, and a 15-second countdown progress bar area.

4. The system according to claim 1, characterized in that: The collaborative feedback control module is equipped with a priority logic circuit, and its output control logic is as follows: the patient trigger signal takes priority over the automatic leveling signal, and the automatic leveling signal takes priority over the operator control signal.

5. The system according to claim 1, characterized in that: The electric push rod of the inclined bed actuator has two driving modes: Quick flattening mode, drive speed is 10° / second; Slow-speed flattening mode, drive speed is 5° / second.

6. The system according to claim 1, characterized in that: The system also includes a vital signs monitoring module, which includes sensors for collecting heart rate and blood pressure data. These sensors are connected to the collaborative feedback control module via data cables.

7. The system according to claim 1, characterized in that: The wireless handheld button uses a mechanism of three consecutive signal transmissions and CRC verification to ensure the validity of the trigger signal and avoid accidental activation.

8. The system according to claim 1, characterized in that: The inclined bed is equipped with a mechanical emergency stop rope on one side. The rope is connected to an independent power circuit breaker structure, which is used to forcibly cut off the power supply to the electric push rod when the electronic system fails.

9. The system according to claim 1, characterized in that: The operator control module includes an identity recognition device, which is either a magnetic card swiping module or a password input module, used to restrict operator permissions.

10. The system according to claim 1, characterized in that: When the collaborative feedback control module receives a vital sign abnormality signal and determines that it has reached the preset warning threshold, the control panel automatically switches the countdown prompt from 15 seconds to 10 seconds to improve the response speed.

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