Self-adaptive adjusting sphygmomanometer and control method thereof

Abstract

The invention relates to a self-adaptive adjustment sphygmomanometer and a control method thereof.The self-adaptive adjustment sphygmomanometer comprises a base assembly, an arm cylinder measuring assembly comprises a motor, a toothed belt and a binding belt, the output end of the motor is connected to the toothed belt, and the toothed belt is connected to the binding belt; the arm cylinder measuring assembly is provided with a first sensor, and the first sensor is arranged on the binding belt and faces the arm. The rotating shaft assembly is rotatably connected between the base assembly and the arm cylinder measuring assembly; the locking mechanism is used for fixing the posture of the arm cylinder measuring assembly relative to the base assembly; the controller is electrically connected with the motor and the first sensor. The controller controls the motor to drive the binding belt to contract so as to surround the arm, controls the motor to output torque to drive the binding belt so as to drive the arm cylinder measuring assembly to adaptively rotate around the rotating shaft assembly to a fitting position according to operation parameter feedback of the motor, and controls the locking mechanism to be switched to a locking state so as to collect a blood pressure measuring signal through the first sensor; in this way, self-adaptive rotation adjustment of the arm cylinder measuring assembly is achieved so as to adapt to the arm.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to an adaptive blood pressure monitor and its control method. Background Technology

[0002] Existing arm-type electronic blood pressure monitors typically consist of a base and an arm tube, with the arm tube hinged to the base via a horizontal pivot. This structure only allows for simple opening and closing angle adjustments (i.e., pitching motion) of the arm tube in the vertical direction, and the rotational freedom is strictly limited to a single dimension.

[0003] However, in real-world usage scenarios, some users, due to differences in seat height and posture habits, will naturally have their arms raised or lowered, and this posture is often not a simple tilt within a single vertical plane. Other users may experience left or right arm tilting due to incorrect body positioning. Because this arm cuff can only adjust its angle in the vertical plane and cannot accommodate horizontal swaying movements or complex angular posture changes, users must consciously adjust their body or arm position to accommodate the cuff. This not only reduces ease of use but may also affect the accuracy of blood pressure measurements due to unnatural arm positioning and poor fit with the cuff. Furthermore, the rigid, fixed arm cuff's inability to adjust its angle makes it difficult for users of different body types and postures to achieve a consistent comfortable user experience, limiting the product's compatibility. Summary of the Invention

[0004] This application provides an adaptive blood pressure monitor and its control method, which enables the arm barrel measuring component to adaptively rotate and adjust its posture to adapt to the arm for blood pressure measurement, eliminating measurement errors and discomfort caused by angular deviations.

[0005] Therefore, this application provides an adaptive blood pressure monitor, comprising: Base assembly; The armhole measuring assembly includes a motor, a toothed belt, and a retractable belt. The output end of the motor is connected to the toothed belt, and the toothed belt is connected to one end of the retractable belt. The toothed belt moves under the drive of the motor, causing the retractable belt to contract or release. The armhole measuring assembly also includes a first sensor, which is located on the side of the retractable belt facing the arm, for collecting blood pressure measurement signals. A rotating shaft assembly is rotatably connected between the base assembly and the boom measuring assembly. The rotating shaft assembly includes a locking mechanism for fixing the posture of the boom measuring assembly relative to the base assembly in a locked state. A controller, which is electrically connected to the motor, the first sensor and the locking mechanism respectively; The controller is configured to: control the motor to drive the retractable band to contract and wrap around the arm, and control the output torque of the motor to drive the tension generated by the retractable band to drive the arm cylinder measuring component to adaptively rotate around the rotating shaft component to the fitting position according to the feedback of the operating parameters of the motor, and control the locking mechanism to switch to the locked state to collect blood pressure measurement signals through the first sensor.

[0006] As a preferred embodiment, the pivot assembly is one of a universal joint, a ball joint mechanism, or a multi-degree-of-freedom mechanical joint.

[0007] As a preferred embodiment, the locking mechanism is one of an electromagnetic locking mechanism, a mechanical locking mechanism, or a hydraulic locking mechanism.

[0008] As a preferred embodiment, the boom cylinder measuring assembly is further provided with a second sensor, which is electrically connected to the controller and is used to collect the operating parameters of the motor and send the operating parameters to the controller.

[0009] As a preferred embodiment, the second sensor includes a current sensor and a Hall sensor, wherein the current sensor is used to monitor the operating current of the motor, and the Hall sensor is used to monitor the rotational speed of the motor.

[0010] This application also provides a control method for an adaptive blood pressure monitor, which includes the following steps: The motor is controlled to output a first torque, and the toothed belt is driven to retract the retracting belt so as to wrap the arm cylinder measuring assembly around the arm; The operating parameters of the motor are obtained, and the fit between the retractable belt and the arm is determined based on the changes in the operating parameters. When a change in the fit is detected, the motor is controlled to maintain the first torque output, so that the arm cylinder measuring component can adaptively rotate around the rotating shaft assembly under the reaction force of the toothed belt tension; When the adaptive rotation adjustment is completed, the motor is controlled to output a second torque, and the locking mechanism is controlled to start the locking state, fixing the arm cylinder measuring component in a measuring position that is coaxial with the arm, and blood pressure measurement is performed.

[0011] As a preferred embodiment, determining the fit between the retractable band and the arm based on changes in the operating parameters includes: When the retractable belt is not in contact with the arm, the operating parameters of the motor are collected by the second sensor to determine the initial range of the operating parameters; When the value of the operating parameter continues to deviate from the initial range, it is determined that the fit between the strap and the arm has changed.

[0012] As a preferred embodiment, the condition for determining the completion of the adaptive rotation adjustment is: The motor's speed drops below a first preset threshold, while its operating current rises above a second preset threshold, and this state is maintained for a duration exceeding a third preset threshold.

[0013] As a preferred embodiment, the second torque is greater than the first torque.

[0014] As a preferred embodiment, the control method further includes the following steps: After the blood pressure measurement is completed, the motor is controlled to release the strap and the locking mechanism is controlled to release the arm.

[0015] The beneficial effects of this application are: The adaptive blood pressure monitor includes a base assembly, an armhole measuring assembly, a rotating shaft assembly, and a controller. The armhole measuring assembly includes a motor, a toothed belt, and a retractable band. The output of the motor is connected to the toothed belt, which is connected to one end of the retractable band. The toothed belt moves under the drive of the motor, causing the retractable band to contract or release. The armhole measuring assembly also includes a first sensor located on the side of the retractable band facing the arm, for collecting blood pressure measurement signals. The rotating shaft assembly is rotatably connected between the base assembly and the armhole measuring assembly, allowing the armhole measuring assembly to... The rotating shaft assembly rotates at multiple angles relative to the base assembly to adjust the posture of the arm cylinder measuring assembly; the controller is electrically connected to the motor and the first sensor respectively; wherein, the controller is configured to: control the motor to drive the tightening strap to contract to wrap around the arm, and according to the operating parameters of the motor, control the output torque of the motor to drive the tension generated by the tightening strap to drive the arm cylinder measuring assembly to adaptively rotate around the rotating shaft assembly to the fitting position, and control the locking mechanism to switch to the locked state to collect blood pressure measurement signals through the first sensor.

[0016] The system connects the base assembly and the arm cylinder measuring assembly via a rotating shaft assembly, providing the basic conditions for the arm cylinder measuring assembly to rotate at multiple angles. This enables the arm cylinder measuring assembly to adaptively adjust its posture. Combined with the motor, toothed belt, retractable belt, and first sensor within the arm cylinder measuring assembly, and with the controller, the motor drives the toothed belt to retract and wrap around the arm. Simultaneously, based on feedback from the motor's operating parameters, the arm cylinder measuring assembly is controlled to adaptively rotate around the rotating shaft assembly to a position that fits the arm, and the locking mechanism is switched to the locked state. Finally, the first sensor collects blood pressure measurement signals. This solves the problem that traditional arm cylinder measuring assemblies can only tilt in one dimension and cannot adapt to complex postures such as arm raising, lowering, or tilting to the left or right, resulting in users having to consciously adjust their bodies and poor measurement accuracy and comfort. This allows users of different body types and usage postures to obtain a comfortable and consistent user experience. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the structure of an adaptive blood pressure monitor provided in this application; Figure 2 Another structural schematic diagram of an adaptive blood pressure monitor provided in this application; Figure 3 for Figure 2 Cross-sectional structural diagram; Figure 4 for Figure 3 A magnified view of part A in the image; Figure 5 A diagram showing the balanced rotation of the rotating shaft assembly in an adaptive blood pressure monitor. Figure 6 The rotating shaft assembly in the adaptive blood pressure monitor can be rotated out to adapt to the state of the human arm. Figure 7 The rotating shaft assembly in the adaptive blood pressure monitor can be rotated to the right to adapt to the state of the human arm after it is rotated out. Figure 8 for Figure 1 Structural diagram of the boom cylinder measuring assembly in the middle; Figure 9 A flowchart illustrating a control method for an adaptive blood pressure monitor provided in this application.

[0019] Explanation of reference numerals in the attached figures: 1. Base assembly; 2. Arm cylinder measuring assembly; 21. Motor; 22. Heading belt; 23. Toothed belt; 3. Rotary shaft assembly. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0022] like Figures 1 to 8 As shown, an adaptive blood pressure monitor according to this application includes a base assembly 1, an armhole measuring assembly 2, a rotating shaft assembly 3, and a controller. The armhole measuring assembly 2 includes a motor 21, a toothed belt 23, and a drawstring 22. The output end of the motor 21 is connected to the toothed belt 23, and the toothed belt 23 is connected to one end of the drawstring 22. The toothed belt 23 moves under the drive of the motor 21, causing the drawstring 22 to contract or release. The armhole measuring assembly 2 also includes a first sensor located on the side of the drawstring 22 facing the arm, for collecting blood pressure measurement signals. The rotating shaft assembly 3 is rotatably connected between the base assembly 1 and the armhole measuring assembly 2. The rotating shaft assembly includes a locking mechanism for fixing the posture of the arm barrel measuring assembly 2 relative to the base assembly 1 in the locked state; the controller is electrically connected to the motor 21 and the first sensor respectively; wherein, the controller is configured to: control the motor 21 to drive the retractable strap 22 to contract to wrap around the arm, and according to the operating parameters of the motor 21, control the output torque of the motor 21 to drive the tension generated by the retractable strap 22 to drive the arm barrel measuring assembly 2 to adaptively rotate around the rotating shaft assembly 3 to the fitting position, and control the locking mechanism to switch to the locked state to collect blood pressure measurement signals through the first sensor.

[0023] Understandably, the base assembly 1 provides stable support and serves as the fixed foundation for the entire device; the arm cylinder measuring assembly 2 includes a motor 21, a toothed belt 23, a retractable belt 22, and a first sensor, responsible for arm fixation and signal acquisition; the rotating shaft assembly 3 connects the base assembly 1 and the arm cylinder measuring assembly 2, allowing the arm cylinder measuring assembly 2 to rotate around the axis, achieving multi-angle posture adjustment, thereby transforming the single-dimensional contraction motion into a three-dimensional posture adjustment motion. This directly expands the motion freedom of the arm cylinder measuring assembly 2, enabling it to adapt to complex postures such as upward / downward movement and left / right tilting caused by the user's sitting posture and body position deviation; in addition, the controller coordinates the actions of the motor 21, the sensor, and the rotating shaft assembly 3 to achieve an automated measurement process. Thus, the user does not need to actively adjust their body or arm, directly solving the pain point of the user having to conform to the device, thereby enabling the user to obtain a comfortable measurement posture without deliberately adjusting their body, further improving stability and user experience.

[0024] Specifically, after the user places their arm inside the drawstring 22 of the arm barrel measuring component 2, the controller sends a start command to the motor 21; the output end of the motor 21 drives the toothed belt 23 to move linearly, and the toothed belt 23 pulls one end of the drawstring 22 connected to it, causing the drawstring 22 to contract towards the arm and initially wrap around the arm.

[0025] During the retraction process, if the contact angle between the arm cylinder measuring component 2 and the arm is not good, the tension on the retractable belt 22 will be uneven, which will directly manifest as fluctuations in the operating parameters of the motor 21, such as increased current and unstable speed. At this time, the controller collects the operating parameters (current, speed, etc.) of the motor 21 in real time, and sends an angle adjustment command to the motor 21 according to the parameter fluctuations. The motor 21 drives the toothed belt 23 to move, thereby causing the retractable belt 22 to retract further or contract. This allows the arm cylinder measuring component 2 to rotate at multiple angles relative to the base component 1 around the rotating shaft component 3, gradually correcting the posture of the arm cylinder measuring component 2 until the retractable belt 22 is completely in contact with the arm. At this time, the motor 21 is evenly stressed and the operating parameters return to stability. After the controller recognizes the stable parameters, it controls the locking mechanism to switch to the locked state to fix the contact angle of the arm cylinder measuring component 2. After the posture is locked, the controller continues to control the motor 21 to drive the band 22 to pressurize or depressurize according to the standard procedure of blood pressure measurement, so as to simulate the inflation and deflation process of the cuff of a traditional blood pressure monitor. The first sensor is attached to the inside of the band 22 and directly contacts the arm being measured. At this time, it collects blood pressure measurement signals such as pressure changes and pulse waves caused by the pulsation of the arm's blood vessels in real time and transmits the signals to the controller. The controller analyzes and processes the received signals, calculates blood pressure data such as systolic pressure and diastolic pressure, and outputs the measurement results to complete the measurement process.

[0026] In other words, the base assembly 1 and the arm cylinder measuring assembly 2 are connected by the rotating shaft assembly 3, providing the basic conditions for the multi-angle rotation of the arm cylinder measuring assembly 2, realizing the adaptive adjustment of the posture of the arm cylinder measuring assembly 2. Then, combined with the motor 21, toothed belt 23, tightening belt 22 and the first sensor in the arm cylinder measuring assembly 2, and with the controller, the motor 21 drives the toothed belt 23 to drive the tightening belt 22 to retract to wrap around the arm. At the same time, according to the feedback of the operating parameters of the motor 21, the arm cylinder is controlled to adaptively rotate around the rotating shaft assembly 3 to the position that fits the arm. After fitting, it switches to the locked state. Finally, the blood pressure measurement signal is collected through the first sensor. This solves the problem that the traditional arm cylinder can only tilt in one dimension and cannot adapt to the complex posture of the arm rising and falling or tilting left and right, which makes users need to deliberately adjust their body and has poor measurement accuracy and comfort. Ultimately, it improves the convenience and accuracy of measurement, expands the product's adaptability, and allows users of different body types and usage postures to obtain a comfortable and consistent user experience.

[0027] like Figure 4 As shown, in this embodiment, the rotating shaft assembly 3 is one of a universal joint, a ball joint mechanism, or a multi-degree-of-freedom mechanical joint, thus providing the boom barrel measuring assembly 2 with multi-dimensional, dead-angle-free rotational freedom, breaking through the limitations of traditional single-dimensional pitch rotating shafts.

[0028] Specifically, when using a universal joint, the arm cylinder measuring component 2 can rotate flexibly in two core dimensions: horizontal yaw and vertical pitch, accurately adapting to the basic posture of the arm when it is raised, lowered, or tilted to the left or right. When using a ball joint mechanism, the arm cylinder can achieve a spatial rotation capability of approximately 360°. Even if the arm presents an irregular posture with compound angles, the adaptive adjustment of the ball joint can keep the arm cylinder measuring component 2 in close contact with the arm. When using a multi-degree-of-freedom mechanical joint, not only can multi-directional rotation be achieved, but the rotation angle of the arm cylinder measuring component 2 can also be controlled through the segmented adjustment and locking of the joint, achieving more refined posture adaptation in conjunction with the parameter feedback of the controller.

[0029] In other words, through the multi-degree-of-freedom rotating shaft assembly 3, in conjunction with the linkage of the motor 21, toothed belt 23, and retractable belt 22, as well as the intelligent control of the controller, the arm barrel measuring assembly 2 can be automatically adjusted to the optimal fit position according to the natural posture of the arm. This avoids the inconvenience of users deliberately adjusting their bodies, and ensures the accuracy of the blood pressure signal collected by the first sensor through a stable fit. At the same time, it expands the product's adaptability to users of different body types and different usage postures.

[0030] In this embodiment, the locking mechanism is one of an electromagnetic locking mechanism, a mechanical locking mechanism, or a hydraulic locking mechanism. Specifically, when the locking mechanism is an electromagnetic locking mechanism, the rotating shaft assembly 3 is a ball joint mechanism. The locking end of the electromagnetic locking mechanism is adapted to the ball head of the ball joint mechanism. At this time, the multi-dimensional rotation characteristics of the ball head of the ball joint mechanism require the locking mechanism to be able to lock quickly from any angle. The locking end of the electromagnetic locking mechanism can be designed as an arc-shaped contact surface to fully contact the ball head, so as to realize the multi-dimensional attitude locking of the arm cylinder measuring assembly 2.

[0031] When the locking mechanism is a mechanical locking mechanism, the rotating shaft assembly 3 is a universal joint, which is usually driven by a motor to drive a cam or gear to drive the locking pin into the positioning groove of the universal joint to fix the posture of the arm cylinder measuring assembly 2; when unlocking, the reverse drive transmission structure is reset.

[0032] When the locking mechanism is a hydraulic locking mechanism, the rotating shaft assembly 3 is a multi-degree-of-freedom mechanical joint. Hydraulic oil is injected into the hydraulic chamber by a hydraulic pump, and the hydraulic pressure is used to push the locking piston to press the rotating shaft of the multi-degree-of-freedom mechanical joint, locking the rotation in different directions respectively, so as to realize the all-round attitude locking of the boom cylinder measuring assembly 2; after releasing the hydraulic oil, the piston resets and releases the lock.

[0033] Among them, after the arm cylinder measuring component 2 is adaptively adjusted to a position that is completely in contact with the arm through the multi-degree-of-freedom rotating shaft, the locking mechanism locks the rotating shaft component 3 in time to lock the position of the arm cylinder measuring component 2, which can provide stable support for the arm, reduce the burden on the user to consciously maintain the arm posture during the measurement process, and further improve the comfort of use.

[0034] At the same time, it avoids displacement or deflection of the arm barrel measuring component 2 due to external force contact or slight shaking of the human body during the measurement process, prevents changes in the adhesion tension of the strap 22 and displacement of the sensor contact position with the arm, ensures the stability of the blood pressure signal collected by the first sensor, greatly reduces measurement errors caused by posture changes, eliminates the uncertainty caused by the movement gap of the rotating shaft component 3, keeps the measurement conditions consistent for users of different body types and postures, and improves the repeatability and reliability of the product measurement results.

[0035] In this embodiment, the boom cylinder measuring component 2 is further provided with a second sensor, which is electrically connected to the controller and is used to collect the operating parameters of the motor 21 and send the operating parameters to the controller.

[0036] As the retractable band 22 gradually wraps around the arm and generates a bonding tension, the load on the motor 21 increases, and the current or torque parameters rise accordingly. When the retractable band 22 reaches the ideal bonding tension, the parameters tend to stabilize. Based on the parameter thresholds fed back by the second sensor, the controller can accurately determine whether the retractable band 22 is too loose (parameters are too low), too tight (parameters exceed limits), or just right, avoiding poor bonding caused by manual judgment or the coarse feedback from the motor 21, and ensuring optimal contact between the arm and the sensor before measurement.

[0037] If the angle of the boom barrel measuring component 2 does not match the natural posture of the arm, uneven tension will occur when the retractable belt 22 wraps around, and the operating parameters of the motor 21 will fluctuate. The second sensor transmits this fluctuation data to the controller in real time. The controller can then accurately identify the direction and magnitude of the tilt and pitch angle deviation of the boom barrel measuring component 2 to make targeted adjustments. When the parameters stabilize, the controller can determine that the boom barrel has been adjusted to the optimal fit position, providing an accurate trigger signal for the subsequent activation of the locking mechanism.

[0038] In addition, when the retractable strap 22 causes the motor 21 to exceed the safety threshold due to abnormal conditions (such as improper arm placement), the second sensor will feed back the over-limit parameter to the controller. The controller can immediately instruct the motor 21 to stop retracting or even release in the reverse direction to avoid the retractable strap 22 being too tight and compressing the arm. This is especially suitable for the elderly, children and other groups with low limb flexibility, and improves the safety of product use.

[0039] In other words, the second sensor, by collecting the operating parameters of the motor 21, provides the controller with accurate feedback on the contact status and contraction process of the band 22 with the arm, solving the problems of ambiguous contact judgment and insufficient adjustment accuracy; and in conjunction with the first sensor, the rotating shaft assembly 3, and the controller, it significantly improves the adaptability, measurement accuracy and system reliability of the blood pressure monitor, further enhancing the user effect of not requiring deliberate adjustment by the user.

[0040] In this embodiment, the second sensor includes a current sensor and a Hall sensor. The current sensor is used to monitor the operating current of the motor 21, and the Hall sensor is used to monitor the rotational speed of the motor 21.

[0041] When the motor 21 drives the toothed belt 23 to retract the drawstring 22, the degree of contact between the drawstring 22 and the arm directly reflects the load change of the motor 21, which is then reflected in the operating current. As the drawstring 22 gradually contacts the arm, the load increases, and the current rises accordingly. When the ideal contact tension is reached, the current tends to stabilize. If the drawstring is too tight or the arm barrel angle is improper, resulting in excessive local force, the current will exceed the preset threshold. The controller can accurately determine the contact state of the drawstring 22 based on the real-time data from the current sensor, avoiding both insufficient tension leading to poor contact between the sensor and the arm, and excessive tension compressing the arm and affecting blood circulation, thus ensuring measurement comfort and accuracy.

[0042] Furthermore, the Hall sensor can capture real-time changes in the rotational speed of the motor 21. On one hand, it reflects the contraction or release rate of the retractable belt 22 driven by the toothed belt 23. The controller adjusts the rotational speed of the motor 21 accordingly to achieve smooth movement of the retractable belt 22, avoiding user discomfort or uneven fit due to excessive speed. On the other hand, by combining the rotational speed and running time, the movement distance of the retractable belt 22 can be accurately calculated to adapt to the differences in arm circumference among different users, achieving personalized and precise control of the retractable length. At the same time, abnormal rotational speed can also provide feedback on whether the retractable belt 22 has tangled, jammed, or other faults, allowing the controller to stop the machine in time for protection and improving product safety.

[0043] In other words, by combining current sensors and Hall sensors, the controller receives high-precision feedback on the operating parameters of the motor 21 through complementary monitoring of current reflecting load and speed reflecting motion. For example, if the speed is stable but the current continues to rise during the retraction process, it indicates that the boom angle and arm posture are not matched, resulting in excessive local resistance. The controller can adjust the angle of the boom measuring component 2 accordingly. If both the current and speed are stable and match the preset threshold, it is determined that the retraction belt 22 has been accurately fitted and the boom posture is adapted, thereby triggering the locking mechanism to lock the shaft. This dual-parameter linkage judgment logic makes the adaptive adjustment of the boom measuring component 2 more accurate and reliable.

[0044] like Figure 9 As shown, this application also provides a control method for an adaptive blood pressure monitor, which, when using the aforementioned adaptive blood pressure monitor, includes the following steps: Step S1: Control the motor 21 to output a first torque and drive the toothed belt 23 to retract the drawstring 22 to wrap the arm barrel measuring component 2 around the arm; wherein, the controller sends a command to the motor 21 to control it to output a first torque; the torque of the motor 21 is transmitted to the drawstring 22 through the toothed belt 23, driving the drawstring 22 to retract slowly, so that the arm barrel measuring component 2 is initially wrapped around the user's arm. In this way, the first torque output by the motor 21 generates a basic tension in the drawstring 22, which avoids compressing the arm due to excessive tension, and allows the drawstring 22 to maintain initial contact with the arm, providing a prerequisite for subsequent fit judgment and posture adjustment; Step S2: Obtain the operating parameters of the motor 21, and determine the fit between the retractable strap 22 and the arm based on the changes in the operating parameters; wherein, the current sensor in the second sensor monitors the operating current of the motor 21 in real time to reflect the load change of the retractable strap 22; the Hall sensor monitors the rotation speed of the motor 21 in real time to reflect the contraction rate and stroke of the retractable strap 22, and synchronously feeds back the two sets of operating parameters to the controller; the controller analyzes the fit between the retractable strap 22 and the arm according to the preset operating parameter thresholds. Specifically, if the current fluctuates greatly and the rotation speed is unstable, it indicates that the posture of the arm cylinder measuring component 2 does not match the natural posture of the arm, and there is a problem of uneven local tension in the retractable strap 22; if the parameters tend to be stable, it indicates that the fit is good; in this way, the controller can accurately capture the fit deviation and provide a reliable decision basis for subsequent posture adjustment.

[0045] Step S3: When a change in the fit is detected, the motor 21 is controlled to maintain the first torque output, so that the arm barrel measuring component 2 can adaptively rotate around the rotating shaft component 3 under the reaction force of the tension of the toothed belt 23. When the controller detects an abnormal fit (parameter fluctuation), the motor 21 is controlled to maintain the first torque output, and the tension of the drawstring 22 remains constant. Due to uneven tension, the arm generates a reverse force on the drawstring 22, which is transmitted to the arm barrel measuring component 2, pushing it to adaptively rotate around the rotating shaft component 3. This can simultaneously achieve vertical pitch, horizontal yaw, or combined angle adjustment. In this way, the tension of the drawstring 22 is used as the driving force for the adaptive adjustment of the arm barrel measuring component 2, eliminating the need for an additional power source and simplifying the structural design. At the same time, through the multi-degree-of-freedom characteristics of the rotating shaft component 3, it can adapt to the combined postures of the arm, such as raising, lowering, and tilting to the left and right, ensuring both the comfort of the fit and the precise adaptation to the raising, lowering, or tilting postures of the arm.

[0046] Step S4: When the adaptive rotation adjustment is completed, the motor 21 is controlled to output a second torque, and the locking mechanism is controlled to activate the locking state, fixing the arm cylinder measuring component 2 in a measurement position coaxially with the arm, and performing blood pressure measurement. Specifically, when the controller determines, through feedback from the second sensor, that the motor 21's current and speed are stable within a preset threshold range, indicating that the arm cylinder measuring component 2 has been adjusted to the optimal position coaxially with the arm, the motor 21 is instructed to switch to output the second torque. Simultaneously, the controller sends a signal to the locking mechanism to lock the rotating shaft assembly 3, completely fixing the posture of the arm cylinder measuring component 2. After posture locking, the first sensor begins to stably collect blood pressure measurement signals, completing the blood pressure measurement. Thus, the torque switching of the motor 21 ensures comfortable contact, and the locking mechanism eliminates the risk of arm cylinder displacement during measurement, ensuring the stability of the first sensor signal. Ultimately, the high-precision acquisition by the first sensor improves the accuracy of blood pressure measurement.

[0047] In this way, the limitations of the traditional boom barrel measurement component 2 in single-dimensional adjustment are solved by the closed-loop coordination of power drive, state perception, adaptive adjustment and rigid locking. Furthermore, the machine adapts to human precise measurement effect through adaptive adjustment and stable locking.

[0048] In this embodiment, determining the fit between the retractable band 22 and the arm based on changes in the operating parameters includes: Step S21: When the retractable belt 22 is not in contact with the arm, the second sensor collects the operating parameters of the motor 21 to determine the initial range of the operating parameters. Specifically, when the retractable belt 22 is not in contact with the arm, the controller instructs the motor 21 to drive the toothed belt 23 with a first torque to retract the retractable belt 22. At this time, the motor 21 is in an unloaded or lightly loaded operating state. During this period, the second sensor continuously collects the parameters of the motor 21 during unloaded operation; specifically, the current sensor collects the unloaded operating current of the motor 21 in real time, and the Hall sensor collects the unloaded speed of the motor 21 in real time. The controller summarizes and analyzes the current and speed data collected during this stage to ensure the accuracy of the initial range. Step S22: When the values ​​of the operating parameters continuously deviate from the initial range, it is determined that the contact state between the retractable band 22 and the arm has changed. Specifically, as the retractable band 22 continues to contract, once it begins to contact the arm, the second sensor collects parameters of the motor 21 under load in real time, including current and speed. The operating load of the motor 21 will change significantly, as follows: When the retractable strap 22 comes into contact with the arm, the resistance increases, the load on the motor 21 increases, and the operating current collected by the current sensor will exceed the initial current range set in step S21, and the value will continue to rise with the increase of the contact force; affected by the increased load, the speed of the motor 21 will fluctuate or decrease, and the speed value collected by the Hall sensor will also deviate from the initial speed range. The controller continuously compares the real-time collected current and speed parameters with the initial range. As long as two sets of parameters or any set of key parameters continuously deviate from the initial range, it can accurately determine that the fit between the retractable band 22 and the arm has changed, including from no contact to contact, or from uniform fit to local tension unevenness. In this way, it can adapt to users with different arm circumferences and different arm postures, avoiding the problem of fit being too tight or too loose due to fixed stroke.

[0049] In other words, by collecting data from the second sensor and cooperating with the controller, the parameters are monitored to see if they continuously deviate from the benchmark. This upgrades the judgment of the fit of the retractable strap 22 from a vague perception to a quantitative judgment. It can not only accurately identify the contact moment between the retractable strap 22 and the arm, but also capture the problem of uneven tension during the fit process. This provides a precise trigger signal for the adaptive rotation adjustment of the arm barrel measuring component 2 in step S3, ensuring the timeliness and effectiveness of subsequent posture adjustments.

[0050] In this embodiment, the condition for determining that the adaptive rotation adjustment is complete is: the rotational speed of the motor 21 drops below a first preset threshold V. threshold At the same time, its operating current rises above the second preset threshold I. contact Furthermore, the duration of this state exceeds the third preset threshold T.

[0051] The goal of adaptive rotation adjustment is to ensure that the retractable strap 22 is fully in contact with the arm. At this point, the operating state of the motor 21 changes from load fluctuation during dynamic adjustment to load balance after stable contact. In other words, when the controller determines that the adjustment is complete, the retractable strap 22 has already driven the arm cylinder to rotate around the rotating shaft assembly 3 to a position coaxially in contact with the arm through tension; the tension of the motor 21 maintaining the first torque output balances the reaction force of the arm, and the retractable strap 22 no longer needs to contract or relax further. At this point, its determination logic must meet the following conditions: Speed ​​condition: When the Hall sensor detects the motor speed V21 <V threshold V threshold The minimum stable speed of motor 21 after the arm is attached indicates that the retractable strap 22 has stopped contracting strongly (since the arm is attached, there is no need to continue pulling the retractable strap 22). Current condition: When the current sensor detects that the motor current I > I21 contact I contactTo maintain the minimum current required to keep the tension after bonding, it is explained that the motor 21 needs to continuously output torque to maintain the tension of the retractable belt 22 on the arm cylinder (to counteract the reaction force of the arm). Duration condition: The above rotational speed is lower than V threshold And the current is higher than I contact The state needs to be maintained for t>T, where T is the minimum time to filter out instantaneous disturbances. Preferably, T is 0.5s to ensure that the state is stable rather than fluctuating randomly.

[0052] In other words, when V <V threshold And the current I>I contact When the duration t>0.5s, it is determined that the posture adjustment is completed and the arm is tightly held; that is, when the load (current) of the motor 21 tends to stabilize and the speed drops below the threshold, it means that the arm barrel measuring component 2 has been attached and no longer rotates, that is, the retractable belt 22 and the arm have achieved axial alignment and attachment.

[0053] Understandably, during the retraction of the drawstring 22, the motor 21 initially outputs a constant torque. When the drawstring 22 makes uneven contact with the arm, the speed measuring component detects fluctuations in the motor 21's rotational speed V as the arm cylinder measuring component 2 rotates to adjust its posture. Furthermore, the rotation of the arm cylinder measuring component 2 alters the retraction cycle of the drawstring 22, causing load variations; therefore, the load fluctuation of the motor 21 increases. As the arm cylinder measuring component 2 adjusts its posture, the contact area between the drawstring 22 and the arm gradually increases, and the corrective torque decreases accordingly. When the arm cylinder measuring component 2 rotates to be parallel to the arm, the drawstring 22 makes uniform contact with the arm around its entire circumference. At this point, the corrective torque drops to zero, the arm cylinder measuring component 2 stops rotating, and the drawstring 22 can no longer retract synchronously with the motor 21. The load on the motor 21 suddenly increases, and its rotational speed V drops significantly.

[0054] Understandably, when the toothed belt 23 contracts, its tangential tension T is converted into a radial clamping force on the inner envelope (arm). For a semi-circular envelope, its radial resultant force... It is directly proportional to the tension T, and the theoretical limit is .

[0055] When there is a deviation angle α between the axis of the boom measuring component 2 and the axis of the arm, the contact pressure distribution between the toothed belt 23 and the arm exhibits axial asymmetry. This asymmetry causes the point of application of the radial resultant force (pressure center) to shift axially relative to the ball joint rotation center of the rotating shaft assembly 3. At this point, the effective corrective driving torque D generated satisfies the following relationship:

[0056] Where T is the instantaneous tension within the toothed belt 23; The length of the structural arm from the center of the plane of the toothed belt 23 to the center of rotation of the ball head of the rotating shaft assembly 3; η(α) is the contact imbalance coefficient related to the deviation angle. When α=0, η=0; when α increases, η increases.

[0057] Feasibility verification: The system parameters are set as follows: The preset holding friction torque of the ball joint of the pivot assembly 3 =0.15 N·m (used to overcome gravity).

[0058] Structural arm length =0.05m.

[0059] In the initial stage of adaptive adjustment, it is assumed that the imbalance coefficient η≈0.2.

[0060] For the boom measuring assembly 2 to rotate relative to the base assembly 1, D must satisfy D> Substitute into the formula to deduce the minimum tension required. :

[0061] Therefore, the contraction of the toothed belt 23 only requires a tension of about 7.5N (a tension level far below the pressure threshold that causes pain in the human body) to generate a corrective torque that can overcome joint friction and initiate adaptive adjustment.

[0062] As the toothed belt 23 tightens further, the tension T rapidly increases to over 30N, generating a strong torque greater than 0.6N·m, ensuring that the arm barrel measuring assembly 2 can overcome interference such as clothing friction and quickly and accurately align the arm.

[0063] In this embodiment, the second torque is greater than the first torque. The first torque, serving as the driving force during the initial contraction and posture adjustment phases, has a relatively low torque value. Its core function is to generate sufficient tension in the retractable band 22 to drive the arm-tube measuring component 2 to rotate adaptively, without causing excessive pressure on the arm. At low torque, the contact tension between the retractable band 22 and the arm is within a flexible adaptation range. When the angle of the arm-tube measuring component 2 does not match the arm posture, the reaction force generated by the uneven tension can easily push the arm-tube measuring component 2 to rotate around the rotating shaft component 3, achieving pressure-free posture calibration. Simultaneously, the low torque also avoids user discomfort caused by excessive contraction of the retractable band 22, ensuring a smooth experience during the adjustment phase.

[0064] Furthermore, the core principle of blood pressure measurement is to block arterial blood flow in the arm by applying pressure with the band 22, and then gradually depressurizing to capture changes in blood flow. Once the arm sleeve has completed its adaptive adjustment and is secured by the locking mechanism, the controller switches to a larger second torque, which drives the band 22 to further contract, increasing the contact tension to the effective pressure range required for blood pressure measurement. This torque increase ensures that the first sensor receives sufficient pressure support to accurately capture changes in arterial pulsation, avoiding weak measurement signals and data distortion caused by insufficient tension.

[0065] In this embodiment, the control method further includes the following steps: Step S5: After the blood pressure measurement is completed, control the motor 21 to drive the strap 22 to release, and control the locking mechanism to release the lock to loosen the arm.

[0066] When the first sensor completes the acquisition of the blood pressure measurement signal and the controller completes the data processing and output, it sends an unlocking signal to the locking mechanism to release the lock on the rotating shaft assembly 3, allowing the arm cylinder measuring assembly 2 to return to a multi-degree-of-freedom rotation state; at the same time, it sends a reverse rotation command to the motor 21, controlling the motor 21 to output reverse torque, driving the toothed belt 23 to move in the reverse direction, thereby driving the tightening belt 22 to release and loosen at a uniform speed, releasing the wrapping restraint on the user's arm.

[0067] In addition, after the retractable belt 22 is fully released, it returns to its initial open state. After the locking mechanism is released, the shaft resets and the device returns to standby mode. It can be used by the next user without manual reset, making it suitable for high-frequency use scenarios such as shared use in homes or community medical stations.

[0068] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0069] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0070] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0071] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0072] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Since these modifications and variations fall within the scope of the claims and their equivalents, this application also intends to include these modifications and variations.

[0073] The above description describes specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An adaptive blood pressure monitor, characterized in that, include: Base assembly; The armhole measuring assembly includes a motor, a toothed belt, and a retractable belt. The output end of the motor is connected to the toothed belt, and the toothed belt is connected to one end of the retractable belt. The toothed belt moves under the drive of the motor, causing the retractable belt to contract or release. The armhole measuring assembly also includes a first sensor, which is located on the side of the retractable belt facing the arm, for collecting blood pressure measurement signals. A rotating shaft assembly is rotatably connected between the base assembly and the boom measuring assembly. The rotating shaft assembly includes a locking mechanism for fixing the posture of the boom measuring assembly relative to the base assembly in a locked state. A controller, which is electrically connected to the motor, the first sensor and the locking mechanism respectively; The controller is configured to: control the motor to drive the retractable band to contract and wrap around the arm, and control the output torque of the motor to drive the tension generated by the retractable band to drive the arm cylinder measuring component to adaptively rotate around the rotating shaft component to the fitting position according to the feedback of the operating parameters of the motor, and control the locking mechanism to switch to the locked state to collect blood pressure measurement signals through the first sensor.

2. The adaptive blood pressure monitor according to claim 1, characterized in that, The pivot assembly is one of a universal joint, a ball joint mechanism, or a multi-degree-of-freedom mechanical joint.

3. The adaptive blood pressure monitor according to claim 2, characterized in that, The locking mechanism is one of an electromagnetic locking mechanism, a mechanical locking mechanism, or a hydraulic locking mechanism.

4. The adaptive blood pressure monitor according to claim 3, characterized in that, The boom cylinder measuring assembly is also equipped with a second sensor, which is electrically connected to the controller and is used to collect the operating parameters of the motor and send the operating parameters to the controller.

5. The adaptive blood pressure monitor according to claim 4, characterized in that, The second sensor includes a current sensor and a Hall sensor. The current sensor is used to monitor the operating current of the motor, and the Hall sensor is used to monitor the speed of the motor.

6. A control method for an adaptive blood pressure monitor, characterized in that, The adaptive blood pressure monitor applied to any one of claims 1 to 5 comprises the following steps: The motor is controlled to output a first torque, and the toothed belt is driven to retract the retracting belt so as to wrap the arm cylinder measuring assembly around the arm; The operating parameters of the motor are obtained, and the fit between the retractable belt and the arm is determined based on the changes in the operating parameters. When a change in the fit is detected, the motor is controlled to maintain the first torque output, so that the arm cylinder measuring component can adaptively rotate around the rotating shaft assembly under the reaction force of the toothed belt tension; When the adaptive rotation adjustment is completed, the motor is controlled to output a second torque, and the locking mechanism is controlled to start the locking state, fixing the arm cylinder measuring component in a measuring position that is coaxial with the arm, and blood pressure measurement is performed.

7. The control method for the adaptive blood pressure monitor according to claim 6, characterized in that, The step of determining the fit between the retractable band and the arm based on changes in the operating parameters includes: When the retractable belt is not in contact with the arm, the operating parameters of the motor are collected by the second sensor to determine the initial range of the operating parameters; When the value of the operating parameter continues to deviate from the initial range, it is determined that the fit between the strap and the arm has changed.

8. The control method for the adaptive blood pressure monitor according to claim 7, characterized in that, The condition for determining whether the adaptive rotation adjustment is complete is as follows: The motor's speed drops below a first preset threshold, while its operating current rises above a second preset threshold, and this state is maintained for a duration exceeding a third preset threshold.

9. The control method for the adaptive blood pressure monitor according to claim 6, characterized in that, The second torque is greater than the first torque.

10. The control method for the adaptive blood pressure monitor according to claim 6, characterized in that, The control method further includes the following steps: After the blood pressure measurement is completed, the motor is controlled to release the strap and the locking mechanism is controlled to release the arm.

Images