Multi-parameter test tool of cardio-pulmonary resuscitation machine and use method

Abstract

The invention belongs to the technical field of cardio-pulmonary resuscitation machines, and discloses a multi-parameter testing tool of a cardio-pulmonary resuscitation machine and a using method. The tool comprises a fixed shaft and a data acquisition module, the fixed shaft is sleeved with an elastic piece, the top of the fixed shaft is sleeved with a sleeve, the sleeve is connected with a pressing plate, and the sleeve is detachably installed on the pressing plate; the bottom of the pressing plate is connected with a pressure sensor. The bottom of the pressure sensor is connected with a displacement sensor. The pressure sensor and the displacement sensor are both in communication connection with the data acquisition module; a shell is arranged outside the fixing shaft, a through hole is formed in a top plate of the shell, and the through hole is formed above the pressing plate. According to the invention, equivalent simulation of chest elasticity of different objects such as adults or children can be realized, and integrated test and analysis of pressing depth, pressing frequency, pressing duty ratio and long-term stability (aging) can be realized by synchronously acquiring force and displacement signals.

Description

Technical Field

[0001] This invention belongs to the field of cardiopulmonary resuscitation (CPR) machine technology, specifically relating to a multi-parameter testing fixture for a CPR machine and its usage method. Background Technology

[0002] Currently, performance verification of cardiopulmonary resuscitation (CPR) machines suffers from the following significant drawbacks: **Functional limitation:** Existing testing equipment often focuses on measuring a single parameter, requiring multiple sets of equipment for complete testing, resulting in cumbersome processes and low efficiency. **Data discretization:** Different parameters are measured by different devices at different times, leading to a lack of synchronization and correlation in the data, making comprehensive performance evaluation and fault diagnosis difficult. **Manual operation:** Key parameters such as compression duty cycle rely heavily on manual timing, resulting in high subjectivity and poor accuracy and repeatability. **Low automation:** Long-term aging tests require personnel on-site, which is time-consuming and labor-intensive, and the continuity and completeness of data recording are difficult to guarantee. **Simulation distortion:** Most testing platforms use rigid targets, which cannot realistically simulate the viscoelastic mechanical properties of the human thoracic cavity, limiting the clinical reference value of the test results.

[0003] Chinese patent publication number CN118050192A, entitled "A Quality Control Testing Device and Method for Cardiopulmonary Resuscitation (CPR) Machines," includes a compression module, a load capacity testing module, a measurement and control module, and a power supply module. The compression module comprises a compression platform, a return spring, a guide bracket, and a displacement sensor. The compression platform is slidably connected to the guide bracket and can move vertically relative to the guide bracket. The return spring, used to simulate the automatic rebound of the human chest cavity, is installed between the guide bracket and the compression platform. The displacement sensor is used to collect the compression depth of the compression platform. The load capacity testing module includes multiple weights. The measurement and control module includes a control unit and a display module. The control unit calculates the compression depth of the compression platform based on the data collected by the displacement sensor and sends it to the display module for display. The power supply module is connected to both the measurement and control module and the displacement sensor. This patent application cannot simultaneously measure the compression pressure and displacement information, nor obtain accurate frequency information. Summary of the Invention

[0004] In order to overcome the problems existing in the prior art, the purpose of this invention is to provide a multi-parameter testing fixture and method for using a cardiopulmonary resuscitation machine. This invention can realize the equivalent simulation of chest cavity elasticity for different subjects, such as adults or children, by replacing elastic components with different elasticity. By synchronously collecting force and displacement signals, it can realize integrated testing and analysis of compression depth, compression frequency, compression duty cycle and long-term stability (aging).

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: In a first aspect, the present invention provides a multi-parameter testing fixture for a cardiopulmonary resuscitation machine, comprising: a fixed shaft and a data acquisition module; an elastic element is sleeved on the fixed shaft; a sleeve is sleeved on the top of the fixed shaft; a pressing plate is connected to the sleeve; the sleeve is detachably mounted on the pressing plate; a pressure sensor is connected to the bottom of the pressing plate; a displacement sensor is connected to the bottom of the pressure sensor; both the pressure sensor and the displacement sensor are communicatively connected to the data acquisition module; a housing is provided outside the fixed shaft; a through hole is opened on the top plate of the housing, and the through hole is located above the pressing plate.

[0006] Optionally, the displacement sensor is a capacitive displacement sensor.

[0007] Optionally, the displacement sensor includes a fixed grid and a moving grid, the fixed grid being fixed on the inner wall of the housing, and the moving grid being connected to the bottom of the displacement sensor.

[0008] Optionally, there are two fixed shafts, each equipped with a sleeve and an elastic element, and both sleeves are fixed to the pressing plate.

[0009] Optionally, the bottom of the fixed shaft is connected to a base plate, the housing is a hollow housing without a base plate, and the bottom of the housing is connected to the top of the base plate.

[0010] Optionally, the top plate of the housing is provided with a limiting device that matches the bottom shell of the cardiopulmonary resuscitation machine under test.

[0011] Optionally, the area of ​​the bottom plate is larger than the area of ​​the top plate of the shell, and the side of the shell is connected with a rib plate, one end of which is fixedly connected to the side of the shell and the other end is fixedly connected to the top of the bottom plate.

[0012] Optionally, a display screen is mounted on the housing, and the display screen is communicatively connected to the data acquisition module.

[0013] Secondly, the present invention provides a method for using the multi-parameter testing fixture for a cardiopulmonary resuscitation machine, characterized by comprising the following steps: The cardiopulmonary resuscitation machine to be tested is mounted on the housing above the pressure plate; Turn on the cardiopulmonary resuscitation machine under test and press the pressure plate through the through hole in the shell; Pressure and displacement information are collected by the pressure sensor and the displacement sensor, and the collected information is sent to the data acquisition module.

[0014] Optionally, after collecting the information: the pressing depth is calculated based on the displacement information collected by the displacement sensor, and the pressing frequency is calculated based on the peak displacement information; Based on the pressure information collected by the pressure sensor, the maximum and minimum pressures are statistically obtained, and the duty cycle is calculated by dividing the time the pressure signal is greater than the set threshold by the time the pressure signal is lower than the set threshold. The status of the cardiopulmonary resuscitation machine under test is determined based on the compression depth, compression frequency, pressure range, and duty cycle.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The multi-parameter testing fixture for the cardiopulmonary resuscitation machine of the present invention can achieve equivalent simulation of chest cavity elasticity for different subjects, such as adults or children, by replacing elastic components with different elasticity. It can also achieve integrated testing and analysis of compression depth, compression frequency, compression duty cycle and long-term stability (aging) by synchronously collecting force and displacement signals.

[0016] This invention solves the problems of existing testing technologies, such as limited functionality, discrete data, reliance on manual labor, and simulation distortion, through an integrated, automated, and highly synchronous design. It provides a solution for the performance verification, quality control, and reliability assessment of cardiopulmonary resuscitation machines, improving the accuracy, efficiency, and clinical reference value of testing.

[0017] Furthermore, this invention enables simultaneous and automated measurement of compression depth, compression frequency, and compression duty cycle on a single platform. It supports long-term unattended aging tests and records parameter drift trends. With replaceable elastic elements, it can quickly adapt to different chest rigidity levels, accommodating both adults and children.

[0018] Furthermore, the present invention uses a printed circuit board assembly for data processing, which can provide a unified hardware time base, multi-channel synchronous sampling, and traceable data management. Attached Figure Description

[0019] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely schematic to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. In the drawings: Figure 1 This is a three-dimensional schematic diagram of the external structure of the test fixture according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the internal core structure of the test fixture in an embodiment of the present invention; Figure 3 This is a schematic diagram of the working state of an embodiment of the present invention; Figure 4 This is a schematic diagram of the test results interface in an embodiment of the present invention; Figure 5 This is a schematic diagram illustrating the principle of calculating the pressure duty cycle in an embodiment of the present invention; The components include: 1. Buffer pad; 2. Quick-lock device; 3. Side plate; 4. Display screen; 5. Rib plate; 6. Adjustable feet; 7. Base plate; 8. Locking hook; 9. Panel; 10. Limiting device; 11. Pressing plate; 12. Elastic element; 13. Fixed shaft; 14. Data acquisition module; 15. Electronic displacement gauge; 16. Pressure sensor; 111. Sleeve; 151. Fixed grid; 17. Housing; 18. Cardiopulmonary resuscitation machine under test. Detailed Implementation

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

[0021] Therefore, the following detailed description of embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0022] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper", "lower", "horizontal", "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed during use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0023] When an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments. The use of the term "horizontal" does not imply that the component is required to be absolutely horizontal, but rather that it may be slightly tilted. "Horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it may be slightly tilted.

[0024] It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of this invention, it should be understood that the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification and appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0026] The present invention will now be described in detail with reference to the accompanying drawings.

[0027] A multi-parameter testing fixture for a cardiopulmonary resuscitation machine according to the present invention includes: a fixed shaft 13 and a data acquisition module 14. An elastic element 12 is sleeved on the fixed shaft 13, and a sleeve 111 is sleeved on the top of the fixed shaft 13. A pressing plate 11 is connected to the sleeve 111, and the sleeve 111 is detachably mounted on the pressing plate 11. A pressure sensor 16 is connected to the bottom of the pressing plate 11, and a displacement sensor 15 is connected to the bottom of the pressure sensor 16. Both the pressure sensor 16 and the displacement sensor 15 are communicatively connected to the data acquisition module 14. A housing 17 is provided outside the fixed shaft 13, and a through hole is opened on the top plate of the housing 17, which is located above the pressing plate 11.

[0028] The method of using the multi-parameter testing fixture for a cardiopulmonary resuscitation machine includes the following steps: The cardiopulmonary resuscitation machine 18 to be tested is mounted on the housing 17 above the pressing plate 11.

[0029] Start the cardiopulmonary resuscitation machine 18 under test, and press the pressure plate 11 through the through hole in the housing 17.

[0030] Pressure and displacement information are collected by the pressure sensor 16 and the displacement sensor 15, and the collected information is sent to the data acquisition module 14.

[0031] Cardiopulmonary resuscitation (CPR) machines are critical equipment in emergency medical care, providing continuous, stable, and high-quality chest compressions that conform to international guidelines during transport or prolonged resuscitation. Their reliability directly impacts patient safety; therefore, rigorous testing of their core performance indicators is essential during research and development, factory quality control, and regular maintenance. These indicators primarily include: Compression depth directly affects the chest pump effect and cardiac output. Insufficient depth cannot effectively establish circulation, while excessive depth may cause injury.

[0032] Compression frequency: It must be kept stable within the guideline recommendation range of 100–120 compressions / minute to ensure the effective number of compressions per unit time.

[0033] Compression duty cycle: The ratio of compression time to rebound time within a compression cycle, which directly affects the heart filling effect.

[0034] Long-term operational stability (aging test): Used to evaluate the durability, reliability and performance consistency of equipment under long-term continuous operation.

[0035] The multi-parameter testing fixture for the cardiopulmonary resuscitation machine of the present invention can achieve equivalent simulation of chest cavity elasticity for different subjects, such as adults or children, by replacing elastic elements 12 with different elasticity. It can also achieve integrated testing and analysis of compression depth, compression frequency, compression duty cycle and long-term stability (aging) by synchronously collecting force and displacement signals.

[0036] This invention, through its integrated, automated, and highly synchronous design, solves the problems of existing testing technologies, such as limited functionality, discrete data, reliance on manual labor, and simulation distortion. It provides a solution for the performance verification, quality control, and reliability assessment of cardiopulmonary resuscitation (CPR) machines, improving testing accuracy, efficiency, and clinical reference value. This invention can synchronously and automatically measure compression depth, compression frequency, and compression duty cycle on a single platform. It can support long-term unattended aging tests and record parameter drift trends.

[0037] Example 1 A multi-parameter testing fixture for a cardiopulmonary resuscitation machine includes: a fixed shaft 13 and a data acquisition module 14. An elastic element 12 is sleeved on the fixed shaft 13, and a sleeve 111 is sleeved on the top of the fixed shaft 13, the sleeve 111 being connected to the elastic element 12. A pressing plate 11 is connected to the sleeve 111, a pressure sensor 16 is connected to the bottom of the pressing plate 11, and a displacement sensor 15 is connected to the bottom of the pressure sensor 16. Both the pressure sensor 16 and the displacement sensor 15 are communicatively connected to the data acquisition module 14.

[0038] Optionally, the data acquisition module 14 adopts a printed circuit board assembly (PCBA), which can realize multi-channel analog-to-digital conversion and synchronous sampling, with a sampling rate ≥1 kHz, and provides hardware timestamps; ensuring that the synchronization error between channels is less than 1ms. The PCBA can perform real-time acquisition and preprocessing, and write the data to a local database, supporting periodic calibration by external calibration standards.

[0039] The data acquisition module 14 is hardware-triggered to ensure that the synchronization error between channels is less than 1ms. The microprocessor or FPGA (Field-Programmable Gate Array) in the data acquisition module 14 simultaneously sends a unified start conversion signal to all analog-to-digital converter channels. A multi-channel ADC (analog-to-digital converter) chip with synchronous sampling function is used to ensure that the pressure signal and displacement signal are acquired within the same clock cycle, thereby eliminating the time difference caused by time-division polling and controlling the synchronization error to the microsecond level. Optionally, the elastic element 12 is a spring. Further, the elastic element 12 is a standardized interface spring. Optionally, the elastic coefficient of the elastic element 12 is 8–12 N / mm.

[0040] Optionally, the pressure sensor 16 may be a piezoresistive sensor, a strain gauge pressure sensor, a capacitive pressure sensor, a piezoelectric pressure sensor, or a thin-film pressure sensor.

[0041] Optionally, in this embodiment, the pressure sensor 16 has a range of 0–1000 N. The pressure sensor 16 employs a zero-drift and temperature compensation design. Internally, the pressure sensor 16 uses a full-bridge Wheatstone bridge circuit structure, utilizing differential signals to eliminate common-mode interference. A high-precision thermistor or temperature compensation element is connected in series in the bridge circuit. When changes in ambient temperature cause the strain gauge resistance to drift, the thermistor generates a reverse resistance change to cancel it out.

[0042] Optionally, the displacement sensor 15 is a capacitive displacement sensor.

[0043] Optionally, in this embodiment, the displacement sensor 15 has a resolution ≤ 0.1 mm and a sampling frequency ≥ 1 kHz.

[0044] The displacement sensor 15 includes a fixed grid 151 and a moving grid. The moving grid is fixedly connected to the bottom of the pressure sensor 16, and the fixed grid 151 is fixed on the inner wall of the panel 9 and is arranged on both sides of the moving grid.

[0045] Optionally, the connection between the fixed grid 151 and the panel 9 is secured with multi-point screws, and spring washers are installed on the screws to prevent loosening caused by mechanical vibration. Rubber damping pads or shock-absorbing silicone are installed between the mounting contact surfaces of the fixed grid 151 and the panel 9 to absorb high-frequency mechanical vibration. Optionally, the signal output terminal of the displacement sensor 15 has an anti-aliasing filter to filter out high-frequency noise signals generated by mechanical vibration.

[0046] Optionally, the panel 9 and the side panel 3 are connected by a quick-release structure. Specifically, the panel 9 and the side panel 3 are perpendicular, and a locking hook 8 is provided at the junction of the panel 9 and the side panel 3 for quick disassembly and fastening. When performing internal maintenance of the equipment (such as replacing springs or calibrating sensors), the panel 9 can be removed by opening the locking hook 8 without tools; during testing, the locking hook 8 ensures the stability of the housing and prevents shaking during the testing process from affecting accuracy.

[0047] There are two fixed shafts 13, and each fixed shaft 13 is provided with a sleeve 111 and an elastic element 12. Both sleeves 111 are fixed on the pressing plate 11.

[0048] Specifically, the pressing plate 11 has two mounting holes on both sides, and a sleeve 111 is installed in each of the two mounting holes. Further, the sleeve 111 includes a tube body and a cap, the diameter of which is larger than the diameter of the tube body. The cap is snapped into the mounting hole of the pressing plate 11, and the tube body passes through the mounting hole. The diameter of the mounting hole is larger than the diameter of the tube body and smaller than the diameter of the cap.

[0049] The bottom of the fixed shaft 13 is connected to a base plate 7, and a housing 17 is provided on the base plate 7. The fixed shaft 13 is disposed inside the housing 17. A through hole is provided on the top plate of the housing 17, and the through hole is located above the pressing plate 11.

[0050] Optionally, the bottom of the base plate 7 is provided with adjustable feet 6 for leveling the base plate 7.

[0051] Specifically, the fixed shaft 13 is perpendicularly connected to the base plate 7.

[0052] Optionally, the housing 17 is made of engineering plastic.

[0053] A buffer pad 1 is provided on the top of the pressing plate 11, and the buffer pad 1 extends into the through hole of the top plate. Optionally, both the buffer pad 1 and the through hole of the top plate are circular.

[0054] The cushioning pad 1 is provided to protect the pressing plate 11 and provide necessary friction.

[0055] Optionally, the pressing plate 11 is detachably mounted on the fixed shaft 13 to facilitate replacement of the elastic element 12.

[0056] The top plate of the housing 17 is provided with a limiting device 10 that matches the bottom shell of the cardiopulmonary resuscitation machine 18 under test.

[0057] Specifically, the limiting device 10 consists of two limiting plates, which are arranged parallel to each other on a set of opposite sides of the top plate. The top plate is a rectangular plate.

[0058] Optionally, each limiting plate has at least two mounting holes, which are either oblong or strip-shaped. The long axis of the mounting holes faces the opposite limiting plate, i.e., the long axis is perpendicular to the panel 9, facilitating adjustment of the distance between the two limiting plates to accommodate different bottom widths of the cardiopulmonary resuscitation machine housing. Optionally, the limiting plate is connected to the top plate of the housing 17 by bolts passing through the mounting holes. Two nuts are provided on the bolts, and the limiting plate is positioned between the two nuts. The height of the limiting plate can be adjusted by adjusting the two nuts. Optionally, the bolt has nuts, and the limiting plate is positioned between the nuts and the top plate. A washer is provided between the limiting plate and the top plate to adjust the height of the limiting plate.

[0059] Specifically, the housing 17 is a hollow rectangular body with a top plate. The bottom of the top plate is connected to two opposing front panels 9 and two opposing side panels 3. The data acquisition module 14 is mounted on the side panels 3. The bottoms of both the front panels 9 and the side panels 3 are connected to the top of the base plate 7.

[0060] The area of ​​the bottom plate 7 is larger than the area of ​​the top plate of the shell 17. The side of the shell 17 is connected to a rib plate 5. One end of the rib plate 5 is fixedly connected to the side of the shell 17, and the other end is fixedly connected to the top of the bottom plate 7.

[0061] Specifically, the rib plate 5 is fixedly connected to the side plate 3. Ribs 5 are connected to both side plates 3. Optionally, two rib plates 5 are connected to each side plate 3.

[0062] Optionally, the side plate 3 is equipped with a quick-lock device 2 that matches the cardiopulmonary resuscitation machine 18 under test. The quick-lock device 2 has a pull ring and can be quickly connected to the hook on the cardiopulmonary resuscitation machine 18 under test.

[0063] Optionally, the quick-lock device 2 adopts a latch.

[0064] Optionally, two quick-locking devices 2 are installed on each side plate 3.

[0065] A display screen 4 is mounted on the housing 17, and the display screen 4 is communicatively connected to the data acquisition module 14.

[0066] Example 2 In this embodiment, the cardiopulmonary resuscitation machine of model X was subjected to an 8-hour aging test (target: 50 mm depth, 110 times / minute).

[0067] The cardiopulmonary resuscitation machine 18 to be tested is installed above the pressure plate 11. The cardiopulmonary resuscitation machine 18 to be tested is quickly connected through the limiting device 10 and the quick-locking device 2.

[0068] The cardiopulmonary resuscitation machine under test 18 is activated to press the compression plate 11.

[0069] Pressure and displacement information are collected by the pressure sensor 16 and the displacement sensor 15.

[0070] The pressure and displacement information is preprocessed, and the input signal is low-pass filtered (the cutoff frequency is designed according to the sampling rate and noise characteristics) and then denoised, DC drift removed and temperature drift compensated.

[0071] Specifically, a second-order Butterworth digital low-pass filter is used for low-pass filtering. Considering that the compression frequency of a CPR machine is usually 100-120 compressions per minute (1.6-2Hz), the effective signal is mainly concentrated in the low-frequency range, so the cutoff frequency is set to 10Hz-20Hz. This not only preserves the main frequency and low-order harmonic information of the compression action and accurately reproduces the compression waveform, but also effectively filters out power frequency interference (50Hz / 60Hz) and high-frequency noise generated by mechanical friction.

[0072] The collected information is sent to the data acquisition module 14.

[0073] The pressing depth is calculated based on the displacement information collected by the displacement sensor 15, and the pressing frequency is calculated based on the peak displacement information.

[0074] Based on the pressure information collected by pressure sensor 16, the maximum and minimum pressures are statistically obtained, and the ratio of the time when the pressure signal is greater than the set threshold to the time when the pressure signal is lower than the set threshold is calculated to obtain the duty cycle.

[0075] The status of the cardiopulmonary resuscitation machine 18 under test is determined based on the compression depth, compression frequency, pressure range, and duty cycle.

[0076] The displacement information collected by displacement sensor 15 is a displacement waveform x(t). After smoothing, local extrema are detected. Single press depth .in These are the local maximum and local minimum displacement values, respectively.

[0077] The continuous period T is obtained from the interval between adjacent peaks and valleys of the displacement waveform x(t), and the frequency... .

[0078] Optionally, in this embodiment, the continuous period T is calculated using a moving average.

[0079] Press duty cycle R: A dynamic threshold based on the pressure signal.

[0080] Dynamic threshold of pressure signal

[0081] in This is an adjustable coefficient, which can be optionally set to 0.10–0.15 in this embodiment.

[0082] Within period T, the pressure is above the dynamic threshold. The cumulative duration is Release duration is Duty cycle .

[0083] Plotting pressure-displacement hysteresis curves and theoretical force Compare the data. If the deviation exceeds a threshold, a calibration warning is generated. Calibration records are written to the database to meet traceability audit requirements.

[0084] The pressure-displacement hysteresis curve is a closed curve plotted in a two-dimensional coordinate system, with the displacement value x(t) collected at the same moment as the abscissa and the pressure value F(t) as the ordinate. The data points of a complete pressing cycle (the pressing and rebound process) are connected by this curve.

[0085] An ideal elastic body (following Hooke's Law F=kx) should have a straight curve. However, in real systems, friction and damping exist, and the compression and rebound paths do not coincide, forming a spindle-shaped closed loop. The area of ​​this closed loop represents the energy loss (mechanical hysteresis / damping work) during a single compression cycle. By comparing the actual curve with the theoretical straight line (F... calc The degree of deviation of (=kx) can be used to assess whether the damping characteristics and frictional losses of a mechanical system are within the allowable range.

[0086] The system allows you to set the total duration, target frequency / depth, save interval, and alarm threshold. It executes according to a preset mode and calculates the mean, extreme values, variance, and trend curve at each save point. When the parameters drift beyond the threshold, it automatically alarms and can trigger a shutdown or prompt for manual intervention.

[0087] Optionally, in this embodiment, the total duration is 8 hours, the recording interval is 5 seconds, the cyclic reference waveform is saved every 1000 times, and the alarm threshold depth offset is ±5 mm.

[0088] Each time a calibration is performed, the calibration steps for pressure sensor 16 include: using weights, performing at least three-point linear calibration (e.g., 0, 250 N, 500 N, 1000 N), recording the linear fit coefficients and residuals, where the residuals should be ≤ ±0.5%FS. FS represents full scale.

[0089] Displacement sensor 15 calibration: Calibrate x=0, 10, 20, 50 mm points using a standard displacement stage, with residuals ≤±0.1 mm.

[0090] System acceptance criteria: Under calibrated load and displacement conditions, the accuracy of the measured depth, frequency and duty cycle should meet the following requirements: depth error ≤ ±2 mm, frequency error ≤ ±2 times / minute, and duty cycle deviation ≤ ±0.05, in order to meet production quality inspection requirements.

[0091] The design and working principle of this invention are based on biomechanics and dynamic measurement theory. It responds to the dynamic input signal of the device under test through a physical system with controllable and known mechanical properties, and measures the force and displacement during the response process through sensors, thereby deducing the key performance parameters of the device under test and realizing objective, synchronous and multi-dimensional performance evaluation.

[0092] The fixed shaft 13, elastic element 12, and pressure plate 11 are used to simulate the thoracic cavity, and their dynamic behavior is described by Hooke's Law:

[0093] in: The elastic coefficient is generated by a spring, simulating the elastic force of the chest cavity; This refers to the depth of pressure. For applying pressure.

[0094] Through the and Real-time measurement can obtain the complete dynamic performance curves of the tested cardiopulmonary resuscitation machine 18 under different working conditions.

[0095] Based on clinical and literature data, the range of chest compressions required for adults (depth 50-60mm) in accordance with international guidelines is approximately 400-600 N peak force.

[0096] By Hooke's Law If in It needs to be generated at any time ,but:

[0097] Therefore, the present invention can select an elastic modulus of... to The springs within the range serve as standard adult simulation units.

[0098] For children's simulations, springs with a lower elastic coefficient are used.

[0099] To cover the maximum pressing force (600 N) and take into account the overload safety factor, this invention selects a force sensor with a range of 0–1000 N, which can ensure linearity and resolution, as well as long-term stability and impact resistance.

[0100] To ensure the accuracy of the measurement signal, the dynamic response frequency of the system must be much higher than the frequency of the measured signal (press frequency ≤ 2Hz).

[0101] System natural frequency It is given by the following formula:

[0102] when , (When the equivalent mass of the pressure plate 11 and the buffer pad 1 as a whole is reached):

[0103] This inherent frequency is much higher than the frequency of cardiopulmonary resuscitation (2 Hz), so the system will not resonate during the test, and can stably and accurately reflect the input compression signal, ensuring the accuracy and repeatability of the measurement results.

[0104] Through the aforementioned theoretical modeling and parameter design, this invention constructs a chest cavity physical simulation system with well-defined mechanical parameters, stable response, and realistic simulation. This system exhibits an approximately linear response in the low-frequency range, and the force and displacement outputs of the tested cardiopulmonary resuscitation machine can be accurately acquired and calculated, providing a solid theoretical foundation for realizing automated multi-parameter testing.

[0105] Unless otherwise specified, the equipment components involved in the above embodiments are all conventional equipment components, and the structural settings, working methods or control methods involved are all conventional settings, working methods or control methods in the art unless otherwise specified.

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solutions of the present invention, as long as they do not depart from the spirit and scope of the technical solutions of the present invention, should be covered within the scope of the claims of the present invention.

Claims

1. A multi-parameter testing fixture for a cardiopulmonary resuscitation machine, characterized in that, include: A fixed shaft (13) and a data acquisition module (14) are provided. An elastic element (12) is sleeved on the fixed shaft (13). A sleeve (111) is sleeved on the top of the fixed shaft (13). A pressing plate (11) is connected to the sleeve (111). The sleeve (111) is detachably installed on the pressing plate (11). A pressure sensor (16) is connected to the bottom of the pressing plate (11). A displacement sensor (15) is connected to the bottom of the pressure sensor (16). Both the pressure sensor (16) and the displacement sensor (15) are communicatively connected to the data acquisition module (14). A housing (17) is provided outside the fixed shaft (13). A through hole is opened on the top plate of the housing (17). The through hole is opened above the pressing plate (11).

2. The multi-parameter testing fixture for a cardiopulmonary resuscitation machine according to claim 1, characterized in that, The displacement sensor (15) is a capacitive displacement sensor.

3. The multi-parameter testing fixture for a cardiopulmonary resuscitation machine according to claim 2, characterized in that, The displacement sensor (15) includes a fixed grid and a moving grid. The fixed grid is fixed on the inner wall of the housing (17), and the moving grid is connected to the bottom of the displacement sensor (15).

4. The multi-parameter testing fixture for a cardiopulmonary resuscitation machine according to claim 1, characterized in that, There are two fixed shafts (13), and each fixed shaft (13) is provided with a sleeve (111) and an elastic element (12). Both sleeves (111) are fixed on the pressing plate (11).

5. The multi-parameter testing fixture for a cardiopulmonary resuscitation machine according to claim 1, characterized in that, The bottom of the fixed shaft (13) is connected to the base plate (7), and the housing (17) is a hollow housing without a base plate. The bottom of the housing (17) is connected to the top of the base plate (7).

6. The multi-parameter testing fixture for a cardiopulmonary resuscitation machine according to claim 5, characterized in that, The area of ​​the bottom plate (7) is larger than the area of ​​the top plate of the shell (17). The side of the shell (17) is connected to a rib plate (5). One end of the rib plate (5) is fixedly connected to the side of the shell (17), and the other end is fixedly connected to the top of the bottom plate (7).

7. The multi-parameter testing fixture for a cardiopulmonary resuscitation machine according to claim 1, characterized in that, The top plate of the housing (17) is provided with a limiting device (10) that matches the bottom shell of the cardiopulmonary resuscitation machine (18) being tested.

8. The multi-parameter testing fixture for a cardiopulmonary resuscitation machine according to claim 1, characterized in that, A display screen (4) is installed on the housing (17), and the display screen (4) is communicatively connected to the data acquisition module (14).

9. A method of using the multi-parameter testing fixture for a cardiopulmonary resuscitation machine as described in any one of claims 1 to 8, characterized in that, Includes the following steps: The cardiopulmonary resuscitation machine (18) to be tested is mounted on the housing (17) above the pressing plate (11); Start the cardiopulmonary resuscitation machine under test (18) and press the pressure plate (11) through the through hole of the shell (17); Pressure and displacement information are collected by the pressure sensor (16) and the displacement sensor (15), and the collected information is sent to the data acquisition module (14).

10. The method of using the multi-parameter testing fixture for a cardiopulmonary resuscitation machine according to claim 9, characterized in that, After collecting information: The pressing depth is calculated based on the displacement information collected by the displacement sensor (15), and the pressing frequency is calculated based on the peak displacement information. Based on the pressure information collected by the pressure sensor (16), the maximum pressure and minimum pressure are statistically obtained, and the ratio of the time when the pressure signal is greater than the set threshold to the time when the pressure signal is lower than the set threshold is calculated to obtain the duty cycle. The status of the cardiopulmonary resuscitation machine (18) under test is determined based on the compression depth, compression frequency, pressure range and duty cycle.

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