Method and system for controlling electric sickbed with intermittent inflating and pressurizing device

Abstract

The invention provides a control method and system for an electric sickbed with an intermittent inflating and pressurizing device, and relates to the technical field of control, the method is applied to the electric sickbed comprising a bed frame, an electric lifting structure and a control unit, and intermittent inflating and pressurizing control logic is executed through the control unit. The multi-cavity air bag assembly in the lower limb bearing area is periodically inflated and decompressed, and the pressurization function is automatically stopped or recovered according to the motion state of the bed body. Lower limb venous thrombosis can be effectively prevented, mutual interference between bed body adjustment and air bag pressurization is avoided, and the comfort level and safety of a patient are improved.

Description

Technical Field

[0001] This invention relates to the field of control technology, and in particular to a control method and system for an electric hospital bed with an intermittent inflation and pressurization device. Background Technology

[0002] Electric hospital beds are widely used in the medical and elderly care fields, providing positional adjustment functions to meet the different postural needs of patients and the elderly. In recent years, to prevent and alleviate lower limb blood circulation problems in long-term bedridden patients, electric hospital beds with lower limb pressure functions have gradually emerged. These beds typically have airbag devices installed in the lower limb area, which, through periodic inflation and deflation, simulate the natural muscle contraction process, promoting blood circulation and preventing complications such as deep vein thrombosis and pressure sores.

[0003] Existing electric hospital beds have several technical shortcomings in integrating lower limb airbag inflation functionality. First, the airbag inflation system in current electric hospital beds is usually installed as a separate external accessory, which not only occupies extra space but also results in exposed tubing, complex installation, and increased difficulty in use and maintenance. Second, most electric hospital bed airbag inflation systems lack intelligent control functions, failing to automatically adjust inflation pressure and cycle according to different patients' physical conditions and needs. This leads to inaccurate inflation effects, potentially causing discomfort or poor results for some patients. Summary of the Invention

[0004] The present invention provides a method and system for controlling an electric hospital bed with an intermittent inflation and pressurization device, which can solve the problems in the prior art.

[0005] A first aspect of the present invention provides a control method for an electric hospital bed with an intermittent inflation and pressurization device, the method being applied to an electric hospital bed, the electric hospital bed comprising a bed frame, an electric lifting structure, and a control unit: The lower limb support area of ​​the bed frame is provided with a multi-cavity airbag assembly, which is divided into multiple independent inflatable chambers along the length of the lower limb; The bed frame integrates a gas pressurization device, which is connected to the multi-cavity airbag assembly via a concealed air passage pipe. The control unit is electrically connected to the gas pressurization device and the electric lifting mechanism. The control unit executes intermittent inflation and pressurization control logic, which includes alternating execution of a periodic inflation phase and a depressurization phase. In the inflation phase, an inflation pressure within a preset pressure range is applied to the multiple independent inflation chambers for a preset inflation duration. In the depressurization phase, the gas pressure in the multiple independent inflation chambers is reduced to a low-pressure maintenance value for a preset depressurization duration. The control unit also executes the bed movement and pressurization synchronization control logic. Based on the operating status signal of the electric lifting mechanism, it determines whether the bed frame is in the body position adjustment state. If so, the control unit sends a pause command to the gas pressurization device to stop the execution of the intermittent inflation and pressurization control logic. If not, the control unit resumes the execution of the intermittent inflation and pressurization control logic.

[0006] The intermittent inflation and pressurization control logic includes the alternating execution of periodic inflation and deflation phases, including: The control unit establishes an inflation and pressurization state machine, which defines the transition rules between the inflation phase state and the depressurization phase state. During the inflation phase, the control unit sends an inflation control signal carrying the target inflation pressure parameter to the gas pressurization device. The gas pressurization device delivers compressed gas to the multiple independent inflation chambers through the concealed gas pipeline to the pressure value indicated by the target inflation pressure parameter. At the same time, the inflation phase timer is started to record the duration of the inflation phase. When the duration of the inflation phase reaches the preset inflation duration, the inflation pressurization state machine switches to the depressurization phase state. During the depressurization phase, the control unit sends a depressurization control signal carrying the target depressurization parameters to the gas pressurization device. The gas pressurization device controls the depressurization channel of the concealed gas pipeline to open, so that the multiple independent inflation chambers are reduced to the low pressure maintenance value. At the same time, the depressurization phase timer is started to record the duration of the depressurization phase. When the duration of the depressurization phase reaches the preset depressurization duration, the inflation pressurization state machine switches back to the inflation phase state, forming a periodic alternating cycle.

[0007] The method further includes: The target inflation pressure parameters are set differently based on the location of the multiple independent inflation chambers; The control unit acquires the position identification information of the plurality of independent inflatable chambers, and the position identification information represents the arrangement order of each independent inflatable chamber from distal to proximal along the length of the lower limb; The control unit assigns differentiated inflation pressure values ​​to each independent inflation chamber, and the differentiated inflation pressure values ​​decrease from the distal end to the proximal end. The gas pressurization device controls the compressed gas delivery volume of the inflation branch connected to each independent inflation chamber according to the differentiated inflation pressure value, so that each independent inflation chamber reaches its own differentiated inflation pressure value, forming a gradient pressure distribution from distal to proximal along the length of the lower limb.

[0008] The control unit determines whether the bed frame is in a position adjustment state based on the operating status signal of the electric lifting mechanism, specifically including: The control unit reads the motor drive current value and motor speed value of the electric lifting mechanism according to a preset monitoring cycle; The motor drive current value is compared with a preset drive current threshold, and the motor speed value is compared with a preset speed threshold. When the motor drive current value exceeds the preset drive current threshold and the motor speed value exceeds the preset speed threshold, a body position adjustment flag is generated. The control unit sends a pause command to the gas pressurization device and simultaneously sends a depressurization command, so that the multiple independent inflation chambers are reduced to zero pressure through the rapid depressurization channel. When the motor drive current value does not exceed the preset drive current threshold or the motor speed value does not exceed the preset speed threshold, a "not in body position adjustment" flag is generated. If the intermittent inflation and pressurization control logic is in a paused state, the control unit sends a recovery command to the gas pressurization device.

[0009] Before the control unit sends a pause command, the method further includes: The current execution status information of the intermittent inflation and pressurization control logic is read and stored in the status saving memory. The current execution status information includes the current stage type and the execution duration. When sending a recovery command, the current execution state information is read from the state saving memory: When the execution time is less than a preset proportion of the preset time of the corresponding stage, execution will restart from the stage type before the pause. When the execution duration is greater than or equal to the preset ratio value, skip the stage type before the pause and directly enter the next stage type; The recovery command carries recovery start stage parameters, and the gas pressurization device starts the corresponding inflation or depressurization execution process according to the recovery start stage parameters.

[0010] The method further includes: After sending the inflation control signal, the control unit executes the pressure compliance monitoring process: Real-time pressure feedback data of the multiple independent inflation chambers are acquired from the gas pressurization device according to a preset acquisition cycle; the measured pressure value of each independent inflation chamber is compared with the corresponding inflation pressure target value, and the pressure deviation value is calculated. A pressure adjustment command is generated based on the pressure deviation value. When the pressure deviation value is negative and the absolute value is greater than a preset deviation threshold, the command indicates to increase the inflation flow rate. When the pressure deviation value is positive and the absolute value is greater than the preset deviation threshold, the command indicates to decrease the inflation flow rate. The gas pressurization device adjusts the opening of the flow control valve of each inflation branch according to the pressure regulation command, driving the measured pressure value to approach the inflation pressure target value; When the absolute value of the pressure deviation of all independent inflation chambers is less than or equal to the preset deviation threshold, a pressure maintenance command is sent to maintain the current inflation flow rate and pressure level.

[0011] A second aspect of the present invention provides a control system for an electric hospital bed with an intermittent inflation and pressurization device, the method being applied to an electric hospital bed, the electric hospital bed comprising: The first unit includes a multi-cavity airbag assembly for the lower limb support area of ​​the bed frame, wherein the multi-cavity airbag assembly is divided into multiple independent inflatable chambers along the length of the lower limb; The second unit is used to integrate a gas pressurization device inside the bed frame, and the gas pressurization device is connected to the multi-cavity airbag assembly through a concealed air passage pipe; The third unit is used to electrically connect the control unit to the gas pressurization device and the electric lifting mechanism. The control unit executes intermittent inflation and pressurization control logic, which includes the alternating execution of a periodic inflation phase and a depressurization phase. In the inflation phase, an inflation pressure within a preset pressure range is applied to the multiple independent inflation chambers for a preset inflation duration. In the depressurization phase, the gas pressure in the multiple independent inflation chambers is reduced to a low-pressure maintenance value for a preset depressurization duration. The fourth unit is used by the control unit to execute the bed movement and pressurization synchronization control logic. Based on the operating status signal of the electric lifting mechanism, it determines whether the bed frame is in the body position adjustment state. If so, the control unit sends a pause command to the gas pressurization device to stop the execution of the intermittent inflation and pressurization control logic. If not, the control unit resumes the execution of the intermittent inflation and pressurization control logic.

[0012] A third aspect of the embodiments of the present invention, An electronic device is provided, comprising: processor; Memory used to store processor-executable instructions; The processor is configured to invoke instructions stored in the memory to execute the aforementioned method.

[0013] Fourth aspect of the present invention, A computer-readable storage medium is provided, having stored thereon computer program instructions that, when executed by a processor, implement the aforementioned method.

[0014] The beneficial effects of this application are as follows: By dividing the multi-cavity airbag assembly into multiple independent inflatable chambers along the length of the lower limb, precise pressure therapy can be applied to different parts of the lower limb, effectively preventing venous thrombosis and improving the accuracy and effectiveness of treatment.

[0015] The system employs intermittent inflation and pressurization control logic, which enables automatic alternation between the inflation and deflation phases. This simulates the physiological processes of natural muscle contraction and relaxation, effectively promoting blood circulation and preventing pressure sores and lower limb thrombosis.

[0016] By using the synchronized control logic of bed movement and pressurization, the system achieves coordinated control of electric bed position adjustment and airbag pressurization, avoiding discomfort or safety risks to patients that may be caused by changes in airbag pressure during bed movement, and improving the overall safety and comfort of the system. Attached Figure Description

[0017] Figure 1 This is a schematic flowchart of an electric hospital bed control method with an intermittent inflation and pressurization device according to an embodiment of the present invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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.

[0019] The technical solution of the present invention will be described in detail below with reference to specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0020] Figure 1 This is a flowchart illustrating the control method for an electric hospital bed with an intermittent pneumatic pressurization device according to an embodiment of the present invention. Figure 1 As shown, the method is applied to an electric hospital bed, which includes a bed frame, an electric lifting structure, and a control unit. The lower limb support area of ​​the bed frame is provided with a multi-cavity airbag assembly, which is divided into multiple independent inflatable chambers along the length of the lower limb; The bed frame integrates a gas pressurization device, which is connected to the multi-cavity airbag assembly via a concealed air passage pipe. The control unit is electrically connected to the gas pressurization device and the electric lifting mechanism. The control unit executes intermittent inflation and pressurization control logic, which includes alternating execution of a periodic inflation phase and a depressurization phase. In the inflation phase, an inflation pressure within a preset pressure range is applied to the multiple independent inflation chambers for a preset inflation duration. In the depressurization phase, the gas pressure in the multiple independent inflation chambers is reduced to a low-pressure maintenance value for a preset depressurization duration. The control unit also executes the bed movement and pressurization synchronization control logic. Based on the operating status signal of the electric lifting mechanism, it determines whether the bed frame is in the body position adjustment state. If so, the control unit sends a pause command to the gas pressurization device to stop the execution of the intermittent inflation and pressurization control logic. If not, the control unit resumes the execution of the intermittent inflation and pressurization control logic.

[0021] In one optional implementation, the intermittent inflation and pressurization control logic includes the alternating execution of a periodic inflation phase and a depressurization phase, comprising: The control unit establishes an inflation and pressurization state machine, which defines the transition rules between the inflation phase state and the depressurization phase state. During the inflation phase, the control unit sends an inflation control signal carrying the target inflation pressure parameter to the gas pressurization device. The gas pressurization device delivers compressed gas to the multiple independent inflation chambers through the concealed gas pipeline to the pressure value indicated by the target inflation pressure parameter. At the same time, the inflation phase timer is started to record the duration of the inflation phase. When the duration of the inflation phase reaches the preset inflation duration, the inflation pressurization state machine switches to the depressurization phase state. During the depressurization phase, the control unit sends a depressurization control signal carrying the target depressurization parameters to the gas pressurization device. The gas pressurization device controls the depressurization channel of the concealed gas pipeline to open, so that the multiple independent inflation chambers are reduced to the low pressure maintenance value. At the same time, the depressurization phase timer is started to record the duration of the depressurization phase. When the duration of the depressurization phase reaches the preset depressurization duration, the inflation pressurization state machine switches back to the inflation phase state, forming a periodic alternating cycle.

[0022] In the control methods of intelligent inflation devices, intermittent inflation and pressurization control logic is an important technology for effectively improving wearing comfort and massage effect. By alternating between periodic inflation and depressurization phases, it not only avoids the discomfort caused by continuous high pressure but also produces a rhythmic effect similar to natural massage.

[0023] The control unit establishes an inflation and pressurization state machine, which defines the transition rules between the inflation and depressurization phases. The state machine determines the timing of state transitions by monitoring duration parameters, pressure thresholds, and potential user inputs, thus automating and intelligently operating the system.

[0024] During the inflation phase, the control unit sends an inflation control signal carrying the target inflation pressure parameters to the gas pressurization device. This signal includes parameters such as the target inflation pressure value (e.g., 80-150 mmHg) and the inflation rate (e.g., 5-15 mmHg / second). Upon receiving the inflation control signal, the gas pressurization device activates its built-in air pump, delivering compressed gas to multiple independent inflation chambers through concealed air piping. The air piping is made of medical-grade silicone, with an inner diameter typically of 3-5 mm, effectively withstanding working pressure while maintaining good flexibility.

[0025] During gas delivery, pressure sensors integrated into the gas pressurization device continuously monitor the real-time pressure values ​​of each inflation chamber. A feedback control algorithm adjusts the air pump output power to ensure a steady increase in inflation pressure until the target inflation pressure parameter is reached. Simultaneously, the control unit starts an inflation stage timer to record the elapsed duration of each inflation stage. The inflation time is typically set between 30 and 120 seconds and can be adjusted according to different application scenarios and user needs.

[0026] When the inflation phase reaches the preset inflation time, the inflation pressurization state machine triggers a state transition event, switching from the inflation phase to the depressurization phase. During the transition, the control unit first confirms that all inflation chambers have reached the expected pressure, and then smoothly executes the state switch to avoid discomfort caused by sudden changes.

[0027] During the depressurization phase, the control unit sends a depressurization control signal carrying the target depressurization parameters to the gas pressurization device. This signal includes parameters such as the target low-pressure maintenance value (typically 30%-50% of the initial pressure, e.g., 20-40 mmHg) and the depressurization rate (e.g., 10-20 mmHg / second). Upon receiving the depressurization control signal, the gas pressurization device opens the depressurization channel of the concealed gas pipeline and regulates the gas release rate via a solenoid valve or a micro-mechanical valve.

[0028] After the pressure relief channel opens, the compressed gas in multiple independent inflation chambers is released in a controlled manner, and the pressure gradually decreases to a preset low-pressure maintenance value. Setting a low-pressure maintenance value, rather than complete depressurization, maintains basic support and reduces the time required for the next inflation cycle. Simultaneously, the control unit starts a pressure relief phase timer to record the duration of the pressure relief phase. The pressure relief duration is typically set to 15-60 seconds, shorter than the inflation duration, to create a rhythmic massage sensation.

[0029] During the depressurization process, the gas pressurization device continuously monitors the chamber pressure change curve to ensure a smooth pressure drop and accurately reaches the low-pressure maintenance value. When the time elapsed during the depressurization phase reaches the preset depressurization time, the inflation pressurization state machine triggers a state transition event again, switching from the depressurization phase state back to the inflation phase state, forming a periodic alternation cycle.

[0030] To adapt to different usage scenarios, the control unit can realize multiple intermittent modes: for example, the fast intermittent mode (inflate for 30 seconds, depressurize for 15 seconds) is suitable for active massage; the slow intermittent mode (inflate for 90 seconds, depressurize for 45 seconds) is suitable for soothing relaxation; and the progressive intermittent mode gradually increases the maximum pressure and decreases the minimum pressure in multiple cycles to create a wave-like massage effect.

[0031] The gas pressurization device's built-in microprocessor executes a PID (proportional-integral-derivative) control algorithm, precisely adjusting the air pump output and valve opening based on the deviation between real-time pressure feedback and the target pressure value, ensuring a smooth and controllable inflation and deflation process. When an abnormal situation is detected, such as a sudden pressure change or exceeding a safety threshold, the control unit immediately interrupts the current state, activates the safety protection program, releases the excessive pressure, and issues an alarm to the user.

[0032] By implementing this intermittent inflation and pressurization control logic, the intelligent inflation device can simulate the techniques of a professional massage therapist, providing rhythmic pressure changes to effectively promote blood circulation, relieve muscle fatigue, and avoid discomfort caused by continuous high pressure, thus greatly improving the user experience and treatment effect.

[0033] In one optional implementation, the method further includes: The target inflation pressure parameters are set differently based on the location of the multiple independent inflation chambers; The control unit acquires the position identification information of the plurality of independent inflatable chambers, and the position identification information represents the arrangement order of each independent inflatable chamber from distal to proximal along the length of the lower limb; The control unit assigns differentiated inflation pressure values ​​to each independent inflation chamber, and the differentiated inflation pressure values ​​decrease from the distal end to the proximal end. The gas pressurization device controls the compressed gas delivery volume of the inflation branch connected to each independent inflation chamber according to the differentiated inflation pressure value, so that each independent inflation chamber reaches its own differentiated inflation pressure value, forming a gradient pressure distribution from distal to proximal along the length of the lower limb.

[0034] To differentiate target inflation pressure parameters based on the location of multiple independent inflation chambers, it is necessary to determine the position of each independent inflation chamber on the lower limb. By obtaining the location identification information of each independent inflation chamber, their arrangement order from distal to proximal along the length of the lower limb can be determined. For example, in a pressure therapy device with four independent inflation chambers, the most distal chamber (e.g., located at the ankle) can be designated as the first chamber, while the most proximal chamber (e.g., located at the groin) can be designated as the fourth chamber.

[0035] Location identification information can be obtained in several ways. In one embodiment, the control unit obtains location information by reading a preset electronic tag on each chamber. These electronic tags may be built-in radio frequency identification (RFID) chips, and when the chambers are correctly installed on the device, the reader in the control unit can automatically identify the location of each chamber. In another embodiment, each chamber has a specific interface code on the trachea connecting it to the control unit, and the control unit determines the location of each chamber by identifying the interface code.

[0036] After acquiring location identification information, the control unit assigns differentiated inflation pressure values ​​to each independent inflation chamber. The design of these differentiated pressure values ​​follows a decreasing trend from distal to proximal, consistent with the natural direction of venous blood flow in the human body. For example, for four independent inflation chambers, the target pressure can be set to 40 mmHg for the first chamber (the most distal), 35 mmHg for the second chamber, 30 mmHg for the third chamber, and 25 mmHg for the fourth chamber (the proximal chamber). This gradient pressure distribution effectively promotes venous return and reduces lower limb edema.

[0037] The specific allocation of differentiated inflation pressure values ​​can be determined based on a variety of factors. In one implementation, the pressure value allocation follows a preset formula: P(n) = Pmax - (n-1) × ΔP, where P(n) represents the pressure value of the nth chamber, Pmax represents the maximum pressure value of the most distal chamber, and ΔP represents the pressure decrease between adjacent chambers. By adjusting Pmax and ΔP, the treatment needs of different patients can be accommodated. In another implementation, the pressure value allocation can be based on a clinically preset treatment plan, selecting different gradient distribution patterns for different conditions.

[0038] To achieve differentiated inflation pressure control, the gas pressurization device controls the compressed gas delivery to each inflation branch connected to an independent inflation chamber based on the target pressure value of each chamber. The gas pressurization device includes an air pump and a multi-way valve system, capable of independently controlling the airflow to each inflation chamber. Each inflation branch is equipped with a pressure sensor to monitor the actual pressure within the chamber in real time and feed the data back to the control unit.

[0039] The control unit employs a closed-loop control strategy, adjusting the gas delivery rate based on real-time pressure data to ensure that the actual pressure in each chamber reaches and is maintained at a pre-defined, differentiated target pressure value. Specifically, when the actual pressure in a chamber is detected to be lower than the target value, the control unit instructs the gas pressurization device to increase the gas delivery to that chamber; when the actual pressure is higher than the target value, it reduces the gas volume in the chamber by releasing a valve. This dynamic adjustment ensures that each chamber maintains an appropriate pressure gradient throughout the treatment process.

[0040] In one specific embodiment, the inflation process is performed in two stages. The first stage is the initial inflation stage, in which each chamber is inflated sequentially from distal to proximal, with each chamber maintaining a consistent inflation rate. Once all chambers reach a baseline pressure value (e.g., 20 mmHg), the second stage, the differentiated inflation stage, begins. In this stage, the control unit adjusts the inflation rate of each chamber according to preset differentiated pressure values, causing the pressure in the distal chambers to increase more rapidly to a higher target value, while the pressure in the proximal chambers increases slowly to a lower target value, ultimately creating a gradient pressure distribution along the length of the lower limb from distal to proximal.

[0041] During treatment, the control unit can dynamically adjust the differentiated inflation pressure based on patient feedback or preset treatment plans. For example, a lower pressure gradient can be used at the beginning of treatment, gradually increasing the pressure gradient as treatment progresses to suit the patient's tolerance. Furthermore, the control unit can also achieve periodic pressure changes, simulating the natural contraction of a muscle pump through alternating pressurization and depressurization processes, further promoting venous return.

[0042] Using the above method, precise gradient pressure control can be achieved in the lower limb pressure therapy device. Based on the position of each independent inflation chamber on the lower limb, a pressure decreasing distribution from distal to proximal is formed, which effectively promotes venous blood return and improves the effect of lower limb pressure therapy.

[0043] In one optional implementation, the control unit determines whether the bed frame is in a position adjustment state based on the operating status signal of the electric lifting mechanism, specifically including: The control unit reads the motor drive current value and motor speed value of the electric lifting mechanism according to a preset monitoring cycle; The motor drive current value is compared with a preset drive current threshold, and the motor speed value is compared with a preset speed threshold. When the motor drive current value exceeds the preset drive current threshold and the motor speed value exceeds the preset speed threshold, a body position adjustment flag is generated. The control unit sends a pause command to the gas pressurization device and simultaneously sends a depressurization command, so that the multiple independent inflation chambers are reduced to zero pressure through the rapid depressurization channel. When the motor drive current value does not exceed the preset drive current threshold or the motor speed value does not exceed the preset speed threshold, a "not in body position adjustment" flag is generated. If the intermittent inflation and pressurization control logic is in a paused state, the control unit sends a recovery command to the gas pressurization device.

[0044] The control unit first establishes a connection with the electric lifting mechanism to obtain its operating status signals. During the patient's position adjustment process on the medical bed frame, the control unit needs to monitor the working status of the electric lifting mechanism in real time to ensure the coordinated operation of all parts of the bed.

[0045] The control unit collects the status data of the electric lifting mechanism according to a preset monitoring cycle, which can be set between 100 milliseconds and 500 milliseconds, preferably 200 milliseconds. Within each monitoring cycle, the control unit reads the drive current and speed values ​​of the electric lifting mechanism's motor through its built-in data acquisition module. The motor drive current value is obtained through a built-in current sensor installed in the motor drive circuit; the motor speed value is obtained through an encoder mounted on the motor shaft. The encoder converts the motor's rotational motion into electrical pulse signals, and the control unit calculates the number of pulses per unit time to obtain the motor speed.

[0046] After acquiring the motor drive current and speed values, the control unit compares these values ​​with preset thresholds. The preset drive current threshold can be set to 70% to 80% of the motor's rated current; for example, when the motor's rated current is 2A, the preset drive current threshold can be set to 1.5A. The preset speed threshold can be set to 30% to 40% of the motor's rated speed; for example, when the motor's rated speed is 3000rpm, the preset speed threshold can be set to 1000rpm. These threshold settings must ensure accurate judgment of the motor's operating status while avoiding misjudgments caused by instantaneous fluctuations.

[0047] When the control unit detects that the motor drive current exceeds a preset drive current threshold and the motor speed exceeds a preset speed threshold, it determines that the bed frame is in a position adjustment state and generates a position adjustment flag. This flag is stored as a binary value "1" in the control unit's status register. Immediately afterwards, the control unit sends a pause command to the gas pressurization device via the communication interface. The command format is a data packet containing the operation code "0x01". Simultaneously, it sends a depressurization command, which is a data packet containing the operation code "0x02".

[0048] Upon receiving the above command, the gas pressurization device immediately stops inflating the multiple independent inflation chambers and opens the rapid pressure relief valve. The rapid pressure relief channel consists of a pressure relief pipe with a diameter of 5mm to 10mm and a solenoid pressure relief valve. The solenoid valve opens upon receiving the pressure relief command, rapidly releasing the gas from the multiple independent inflation chambers until the pressure drops to zero. This process typically completes within 1 to 3 seconds to ensure that the air mattress does not exert unnecessary pressure on the patient during bed frame positioning.

[0049] Conversely, when the control unit detects that the motor drive current value does not exceed the preset drive current threshold or the motor speed value does not exceed the preset speed threshold, it determines that the bed frame is not in a position adjustment state, and generates a "not in position adjustment" flag. This flag is stored in the control unit's status register as a binary value of "0". Next, the control unit checks the current state of the intermittent inflation and pressurization control logic. The intermittent inflation and pressurization control logic is the core algorithm for medical mattress air pressure management, and includes three states: normal operation, pause, and fault.

[0050] If the intermittent inflation and pressurization control logic is in a paused state, it indicates that the air mattress pressurization process was previously paused due to bed frame position adjustment. At this time, the control unit sends a recovery command to the gas pressurization device. The command format is a data packet containing the operation code "0x03". After receiving the recovery command, the gas pressurization device restarts the inflation process for multiple independent inflation chambers and restores the intermittent inflation function according to the preset inflation strategy.

[0051] To ensure the stability of the judgment results, the control unit samples the motor status value three times consecutively. Only when all three samples meet the judgment conditions will the corresponding operation be triggered. This continuous sampling judgment mechanism effectively avoids misjudgments caused by momentary interference.

[0052] In practical applications, when medical staff adjust the patient's lying position via the bedside control panel, the electric lifting mechanism starts working. The control unit detects an increase in motor drive current and speed, immediately determining it to be in position adjustment mode. Simultaneously, it pauses the pressurization of the air mattress and releases pressure to avoid uneven pressure distribution caused by changes in bed angle. Once the position adjustment is complete, the motor stops working, the control unit detects a decrease in current and speed, and automatically resumes the intermittent inflation function of the air mattress, ensuring the patient receives continuous pressure relief care.

[0053] This real-time judgment mechanism based on motor operating parameters enables intelligent coordination between bed adjustment and air cushion pressure management, effectively preventing excessive local pressure caused by changes in body position and improving the comfort and safety of long-term bedridden patients.

[0054] In one alternative implementation, before the control unit sends a pause command, the method further includes: The current execution status information of the intermittent inflation and pressurization control logic is read and stored in the status saving memory. The current execution status information includes the current stage type and the execution duration. When sending a recovery command, the current execution state information is read from the state saving memory: When the execution time is less than a preset proportion of the preset time of the corresponding stage, execution will restart from the stage type before the pause. When the execution duration is greater than or equal to the preset ratio value, skip the stage type before the pause and directly enter the next stage type; The recovery command carries recovery start stage parameters, and the gas pressurization device starts the corresponding inflation or depressurization execution process according to the recovery start stage parameters.

[0055] In a control method for an intermittent inflation and pressurization control device, the control unit needs to ensure that the system can correctly continue working from the interruption point or skip a specific stage based on the executed status when processing pause and resume commands.

[0056] Before receiving a pause command, the control unit first reads the current execution status information of the intermittent inflation and pressurization control logic, including the current stage type and the elapsed execution time. This status information is obtained from the execution unit of the gas pressurization device through a dedicated status acquisition module. The current stage type can be an inflation stage, a pressure holding stage, or a pressure relief stage, and the elapsed execution time is recorded in milliseconds as the duration of the current stage.

[0057] After reading, the control unit stores this status information in the status preservation memory. The status preservation memory can be non-volatile memory, ensuring that the status information is not lost even in the event of a power outage. The stored data structure includes a stage type identifier (e.g., 0 for inflation stage, 1 for pressure holding stage, and 2 for pressure release stage), a timestamp record, and the stage start time.

[0058] Next, the control unit sends a pause command to the gas pressurization device, which includes a pause indicator and safety shutdown parameters. Upon receiving the pause command, the gas pressurization device will stop its current operation according to a preset safety procedure, such as depressurizing to a safe pressure value or closing specific valves, to ensure the system is in a safe state.

[0059] When a recovery operation is required, the control unit reads the previously stored current execution status information from the status saver. The reading process employs a verification mechanism to ensure data integrity, such as using a CRC checksum to verify that the data has not been corrupted.

[0060] The recovery decision is based on a comparison between the executed time and the preset time for the corresponding stage. The control unit calculates the proportion of the executed time to the preset time. For example, if the preset time for the inflation stage is 60 seconds, and 15 seconds have been executed before the pause, the proportion is 25%.

[0061] The control unit compares the calculated ratio value with a preset ratio threshold in the system. The preset ratio threshold can be set in the system configuration according to different application scenarios, and is usually set to 50% or 75%. For example, in medical applications, the threshold may be set to 60%, while in industrial applications it may be set to 80%, depending on the balance between processing efficiency and accuracy requirements.

[0062] When the execution time is less than a preset proportion of the corresponding stage's preset time, the control unit decides to restart execution from the stage type before the pause. At this time, the recovery start stage parameter is set to the stage type before the pause. For example, if the operation pauses during the inflation stage and less than a preset proportion of time has been executed, the recovery operation will restart the inflation stage.

[0063] Conversely, when the execution time is greater than or equal to a preset proportion, the control unit decides to skip the previous stage type and directly enter the next stage type. At this time, the recovery start stage parameter is set to the type of the next stage. For example, if the operation is paused during the inflation stage and has already exceeded the preset proportion of time, the recovery operation will directly enter the pressure holding stage.

[0064] Based on the decision, the control unit generates a recovery command, which carries parameters for the recovery initiation phase. The recovery command is sent to the gas pressurization device via a communication interface, and may also include auxiliary parameters such as the target pressure value and execution duration to precisely control the execution process after recovery.

[0065] After receiving a recovery command, the gas pressurization device parses the recovery start-up stage parameters and initiates the corresponding execution process based on these parameters. If the recovery start-up stage parameter indicates the inflation stage, the gas pressurization device will initiate the inflation execution process; if it indicates the depressurization stage, it will initiate the depressurization execution process.

[0066] When performing a recovery operation, different recovery strategies can be applied based on the characteristics of different stages. For example, during the inflation stage, it may be necessary to first detect the current pressure and then decide where to start inflation; during the pressure holding stage, it may be necessary to first stabilize the system pressure and then start timing; during the depressurization stage, it may be necessary to control the depressurization rate to ensure safety.

[0067] In this way, the control unit can intelligently manage the pause and resumption of the intermittent inflation and pressurization control logic, improving the system's flexibility and efficiency while ensuring operational continuity and safety.

[0068] In one optional implementation, the method further includes: After sending the inflation control signal, the control unit executes the pressure compliance monitoring process: Real-time pressure feedback data of the multiple independent inflation chambers are acquired from the gas pressurization device according to a preset acquisition cycle; the measured pressure value of each independent inflation chamber is compared with the corresponding inflation pressure target value, and the pressure deviation value is calculated. A pressure adjustment command is generated based on the pressure deviation value. When the pressure deviation value is negative and the absolute value is greater than a preset deviation threshold, the command indicates to increase the inflation flow rate. When the pressure deviation value is positive and the absolute value is greater than the preset deviation threshold, the command indicates to decrease the inflation flow rate. The gas pressurization device adjusts the opening of the flow control valve of each inflation branch according to the pressure regulation command, driving the measured pressure value to approach the inflation pressure target value; When the absolute value of the pressure deviation of all independent inflation chambers is less than or equal to the preset deviation threshold, a pressure maintenance command is sent to maintain the current inflation flow rate and pressure level.

[0069] After the control unit sends the inflation control signal, it is necessary to further ensure that the pressure in each independent inflation chamber reaches the preset target value. Therefore, a pressure compliance monitoring process is executed. This process ensures that the inflation system accurately controls the pressure in each chamber through real-time pressure feedback and dynamic adjustment mechanisms, achieving the ideal air pressure distribution effect.

[0070] Real-time pressure feedback data from multiple independent inflation chambers is acquired from the gas pressurization device according to a preset acquisition cycle. This acquisition cycle can be set to a range of 100 milliseconds to 1 second to ensure that the acquisition frequency reflects pressure changes promptly without wasting system resources. The gas pressurization device incorporates miniature pressure sensors, each connected to an inflation branch, for real-time acquisition of pressure data from each independent inflation chamber. These sensors employ high-precision MEMS pressure sensing technology, with a measurement range of 0-200 kPa and a resolution of up to 0.01 kPa, ensuring the accuracy of the pressure data.

[0071] After acquiring real-time pressure data, the measured pressure values ​​of each independent inflation chamber are compared with the corresponding target inflation pressure values ​​to calculate the pressure deviation. For example, if the target pressure value for a chamber is set at 50 kPa, and the current measured value is 48.5 kPa, the calculated pressure deviation value is -1.5 kPa. This calculation method intuitively reflects the difference between the actual pressure and the target pressure, facilitating subsequent adjustment decisions.

[0072] Based on the calculated pressure deviation value, a corresponding pressure adjustment command is generated. When the pressure deviation value is negative and its absolute value is greater than the preset deviation threshold, it indicates that the actual pressure is lower than the target pressure, and the inflation flow rate needs to be increased. For example, if the preset deviation threshold is set to 1 kPa, and the deviation value of a certain chamber is -1.5 kPa, since |-1.5 kPa| > 1 kPa, the system will generate a command to increase the inflation flow rate of that chamber. Specifically, this command will include information on adjusting the opening of the corresponding inflation branch flow control valve, such as increasing the opening from the current 40% to 50%.

[0073] Conversely, when the pressure deviation is positive and its absolute value is greater than the preset deviation threshold, it indicates that the actual pressure is higher than the target pressure, and the inflation flow rate needs to be reduced. For example, when the deviation value of a certain chamber is +2.3 kPa, since |+2.3 kPa|>1 kPa, the system will generate an instruction to reduce the inflation flow rate of that chamber, such as reducing the opening of the flow control valve from the current 60% to 45%.

[0074] Upon receiving a pressure regulation command, the gas pressurization device responds by precisely adjusting the opening of the flow control valves in each inflation branch. These flow control valves employ an electric proportional valve design, allowing for stepless adjustment of the opening from 0% to 100%, with a response time of less than 200 milliseconds. Through an electrical pulse control signal, the valve opening is precisely adjusted, thereby altering the gas flow cross-sectional area and achieving precise control of the inflation flow rate. Changes in flow rate directly affect the rate of pressure increase or decrease within the chamber, driving the measured pressure value towards the target inflation pressure value.

[0075] To prevent oscillations during pressure regulation, a progressive adjustment strategy can be adopted. When the absolute value of the pressure deviation is large (e.g., exceeding 5 times the preset deviation threshold), a larger adjustment of the valve opening should be made (e.g., 15%-25%). When the absolute value of the pressure deviation is close to the preset deviation threshold (e.g., exceeding the threshold by less than 1 time), a smaller adjustment of the valve opening should be made (e.g., 5%-10%) to ensure system stability.

[0076] Throughout the adjustment process, the control unit continuously acquires real-time pressure data according to a preset acquisition cycle and compares and adjusts it to form a closed-loop control. When the absolute value of the pressure deviation of all independent inflation chambers is detected to be less than or equal to the preset deviation threshold, it indicates that the pressure of each chamber has reached the target requirement range. At this time, the control unit sends a pressure maintenance command to maintain the current inflation flow rate and pressure level.

[0077] The pressure maintenance command locks the current opening state of the flow control valves in each inflation branch and simultaneously activates the fine-tuning mode. In this mode, the system monitors pressure fluctuations at a higher frequency (e.g., 50 milliseconds / time) and makes slight adjustments when small pressure changes are detected, ensuring that the pressure remains stable near the target value over a long period. For example, when the pressure in a chamber drops slightly, the system will slightly increase the opening of the corresponding valve (e.g., increase it by 1%-2%) to compensate for pressure loss caused by possible gas leakage.

[0078] This sophisticated pressure monitoring and dynamic adjustment mechanism ensures that the pressure in multiple independent inflation chambers remains near their respective target values, providing precise and reliable pressure control for the inflation equipment and meeting the accurate pressure distribution requirements in different application scenarios.

[0079] The electric hospital bed control system with an intermittent pneumatic pressurization device according to an embodiment of the present invention includes: The first unit includes a multi-cavity airbag assembly for the lower limb support area of ​​the bed frame, wherein the multi-cavity airbag assembly is divided into multiple independent inflatable chambers along the length of the lower limb; The second unit is used to integrate a gas pressurization device inside the bed frame, and the gas pressurization device is connected to the multi-cavity airbag assembly through a concealed air passage pipe; The third unit is used to electrically connect the control unit to the gas pressurization device and the electric lifting mechanism. The control unit executes intermittent inflation and pressurization control logic, which includes the alternating execution of a periodic inflation phase and a depressurization phase. In the inflation phase, an inflation pressure within a preset pressure range is applied to the multiple independent inflation chambers for a preset inflation duration. In the depressurization phase, the gas pressure in the multiple independent inflation chambers is reduced to a low-pressure maintenance value for a preset depressurization duration. The fourth unit is used by the control unit to execute the bed movement and pressurization synchronization control logic. Based on the operating status signal of the electric lifting mechanism, it determines whether the bed frame is in the body position adjustment state. If so, the control unit sends a pause command to the gas pressurization device to stop the execution of the intermittent inflation and pressurization control logic. If not, the control unit resumes the execution of the intermittent inflation and pressurization control logic.

[0080] A third aspect of the present invention provides an electronic device, comprising: processor; Memory used to store processor-executable instructions; The processor is configured to invoke instructions stored in the memory to execute the aforementioned method.

[0081] A fourth aspect of the present invention provides a computer-readable storage medium having stored thereon computer program instructions that, when executed by a processor, implement the aforementioned method.

[0082] This invention can be a method, apparatus, system, and / or computer program product. The computer program product may include a computer-readable storage medium having computer-readable program instructions loaded thereon for performing various aspects of the invention.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for controlling an electric hospital bed with an intermittent inflation and pressurization device, characterized in that, The method is applied to an electric hospital bed, which includes a bed frame, an electric lifting structure, and a control unit. The lower limb support area of ​​the bed frame is provided with a multi-cavity airbag assembly, which is divided into multiple independent inflatable chambers along the length of the lower limb; The bed frame integrates a gas pressurization device, which is connected to the multi-cavity airbag assembly via a concealed air passage pipe. The control unit is electrically connected to the gas pressurization device and the electric lifting mechanism. The control unit executes intermittent inflation and pressurization control logic, which includes alternating execution of a periodic inflation phase and a depressurization phase. In the inflation phase, an inflation pressure within a preset pressure range is applied to the multiple independent inflation chambers for a preset inflation duration. In the depressurization phase, the gas pressure in the multiple independent inflation chambers is reduced to a low-pressure maintenance value for a preset depressurization duration. The control unit also executes the bed movement and pressurization synchronization control logic. Based on the operating status signal of the electric lifting mechanism, it determines whether the bed frame is in the body position adjustment state. If so, the control unit sends a pause command to the gas pressurization device to stop the execution of the intermittent inflation and pressurization control logic. If not, the control unit resumes the execution of the intermittent inflation and pressurization control logic.

2. The method according to claim 1, characterized in that, The intermittent inflation and pressurization control logic includes the alternating execution of periodic inflation and deflation phases, including: The control unit establishes an inflation and pressurization state machine, which defines the transition rules between the inflation phase state and the depressurization phase state. During the inflation phase, the control unit sends an inflation control signal carrying the target inflation pressure parameter to the gas pressurization device. The gas pressurization device delivers compressed gas to the multiple independent inflation chambers through the concealed gas pipeline to the pressure value indicated by the target inflation pressure parameter. At the same time, the inflation phase timer is started to record the duration of the inflation phase. When the duration of the inflation phase reaches the preset inflation duration, the inflation pressurization state machine switches to the depressurization phase state. During the depressurization phase, the control unit sends a depressurization control signal carrying the target depressurization parameters to the gas pressurization device. The gas pressurization device controls the depressurization channel of the concealed gas pipeline to open, so that the multiple independent inflation chambers are reduced to the low pressure maintenance value. At the same time, the depressurization phase timer is started to record the duration of the depressurization phase. When the duration of the depressurization phase reaches the preset depressurization duration, the inflation pressurization state machine switches back to the inflation phase state, forming a periodic alternating cycle.

3. The method according to claim 1, characterized in that, The method further includes: The target inflation pressure parameters are set differently based on the location of the multiple independent inflation chambers; The control unit acquires the position identification information of the plurality of independent inflatable chambers, and the position identification information represents the arrangement order of each independent inflatable chamber from distal to proximal along the length of the lower limb; The control unit assigns differentiated inflation pressure values ​​to each independent inflation chamber, and the differentiated inflation pressure values ​​decrease from the distal end to the proximal end. The gas pressurization device controls the compressed gas delivery volume of the inflation branch connected to each independent inflation chamber according to the differentiated inflation pressure value, so that each independent inflation chamber reaches its own differentiated inflation pressure value, forming a gradient pressure distribution from distal to proximal along the length of the lower limb.

4. The method according to claim 1, characterized in that, The control unit determines whether the bed frame is in a position adjustment state based on the operating status signal of the electric lifting mechanism, specifically including: The control unit reads the motor drive current value and motor speed value of the electric lifting mechanism according to a preset monitoring cycle; The motor drive current value is compared with a preset drive current threshold, and the motor speed value is compared with a preset speed threshold. When the motor drive current value exceeds the preset drive current threshold and the motor speed value exceeds the preset speed threshold, a body position adjustment flag is generated. The control unit sends a pause command to the gas pressurization device and simultaneously sends a depressurization command, so that the multiple independent inflation chambers are reduced to zero pressure through the rapid depressurization channel. When the motor drive current value does not exceed the preset drive current threshold or the motor speed value does not exceed the preset speed threshold, a "not in body position adjustment" flag is generated. If the intermittent inflation and pressurization control logic is in a paused state, the control unit sends a recovery command to the gas pressurization device.

5. The method according to claim 4, characterized in that, Before the control unit sends a pause command, the method further includes: The current execution status information of the intermittent inflation and pressurization control logic is read and stored in the status saving memory. The current execution status information includes the current stage type and the execution duration. When sending a recovery command, the current execution state information is read from the state saving memory: When the execution time is less than a preset proportion of the preset time of the corresponding stage, execution will restart from the stage type before the pause. When the execution duration is greater than or equal to the preset ratio value, skip the stage type before the pause and directly enter the next stage type; The recovery command carries recovery start stage parameters, and the gas pressurization device starts the corresponding inflation or depressurization execution process according to the recovery start stage parameters.

6. The method according to claim 1, characterized in that, The method further includes: After sending the inflation control signal, the control unit executes the pressure compliance monitoring process: Real-time pressure feedback data of the multiple independent inflation chambers are acquired from the gas pressurization device according to a preset acquisition cycle; the measured pressure value of each independent inflation chamber is compared with the corresponding inflation pressure target value, and the pressure deviation value is calculated. A pressure adjustment command is generated based on the pressure deviation value. When the pressure deviation value is negative and the absolute value is greater than a preset deviation threshold, the command indicates to increase the inflation flow rate. When the pressure deviation value is positive and the absolute value is greater than the preset deviation threshold, the command indicates to decrease the inflation flow rate. The gas pressurization device adjusts the opening of the flow control valve of each inflation branch according to the pressure regulation command, driving the measured pressure value to approach the inflation pressure target value; When the absolute value of the pressure deviation of all independent inflation chambers is less than or equal to the preset deviation threshold, a pressure maintenance command is sent to maintain the current inflation flow rate and pressure level.

7. An electric hospital bed control system with an intermittent inflation and pressurization device, used to implement the method as described in any one of claims 1-6, characterized in that, include: The first unit includes a multi-cavity airbag assembly for the lower limb support area of ​​the bed frame, wherein the multi-cavity airbag assembly is divided into multiple independent inflatable chambers along the length of the lower limb; The second unit is used to integrate a gas pressurization device inside the bed frame, and the gas pressurization device is connected to the multi-cavity airbag assembly through a concealed air passage pipe; The third unit is used to electrically connect the control unit to the gas pressurization device and the electric lifting mechanism. The control unit executes intermittent inflation and pressurization control logic, which includes the alternating execution of a periodic inflation phase and a depressurization phase. In the inflation phase, an inflation pressure within a preset pressure range is applied to the multiple independent inflation chambers for a preset inflation duration. In the depressurization phase, the gas pressure in the multiple independent inflation chambers is reduced to a low-pressure maintenance value for a preset depressurization duration. The fourth unit is used by the control unit to execute the bed movement and pressurization synchronization control logic. Based on the operating status signal of the electric lifting mechanism, it determines whether the bed frame is in the body position adjustment state. If so, the control unit sends a pause command to the gas pressurization device to stop the execution of the intermittent inflation and pressurization control logic. If not, the control unit resumes the execution of the intermittent inflation and pressurization control logic.

8. An electronic device, characterized in that, include: processor; Memory used to store processor-executable instructions; The processor is configured to invoke instructions stored in the memory to execute the method according to any one of claims 1 to 6.

9. A computer-readable storage medium having computer program instructions stored thereon, characterized in that, When the computer program instructions are executed by the processor, they implement the method described in any one of claims 1 to 6.

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