Sphygmomanometer arm band performance detection device

Abstract

A sphygmomanometer armband performance detection device belongs to the technical field of detection equipment and comprises a workbench, an electric linear sliding table, an extrusion plate, a supporting plate, a PLC, a pressure sensor, an air compressor, a detection circuit and an alarm circuit. A baffle is arranged at the rear end of the workbench, a fixing groove is formed in the front portion of the baffle, the pressure sensor is installed in the fixing groove, and the rear side of the supporting plate is installed on the front side of the baffle. The electric linear sliding table is installed at the front end of the workbench, the supporting frame is installed on a sliding block of the electric linear sliding table, and the extrusion plate is installed at the rear side end of the supporting frame. The PLC, the detection circuit and the alarm circuit are installed in the workbench and electrically connected with the pressure sensor. The air tightness of the inflated armband can be checked, when the armband leaks air due to various reasons, a tester can be prompted at the first time through sounding of the buzzer, convenience is brought to the tester, the detection efficiency is improved, and the true and effective detection data is correspondingly ensured.

Description

Technical Field

[0001] This utility model relates to the field of testing equipment technology, and in particular to a blood pressure monitor arm cuff performance testing device. Background Technology

[0002] An upper arm electronic blood pressure monitor is a common medical device used to measure blood pressure and pulse. It detects blood pressure changes through a cuff (armband) wrapped around the upper arm and uses a built-in pressure sensor and electronic control system to calculate and display the blood pressure reading. Due to its relatively accurate measurements, ease of operation, and wide applicability, the upper arm electronic blood pressure monitor is widely used in home self-monitoring, professional medical measurement, and scientific research and teaching.

[0003] The cuff is a crucial component of a blood pressure monitor, and its performance directly affects whether the monitor can accurately measure blood pressure. Specifically, when the cuff leaks air due to various reasons (such as poor material quality or manufacturing defects), the air pump inside the monitor cannot inflate the cuff, preventing the monitor from continuing to measure blood pressure. Currently, to ensure product quality, blood pressure monitor manufacturers use cuff performance testing equipment to randomly inspect the cuffs of manufactured monitors. Current armband performance testing equipment typically includes a support mechanism, an electric pusher mechanism, and a control system (PLC or microcontroller, etc.). Before testing, the operator fills the armband with a fixed amount of air via an air compressor through the inflation tube and maintains the pressure (the air compressor's exhaust pipe is connected in series with a test pipe via a manual valve; the test pipe and the inflation tube are connected via a high-strength hose). The inflated armband is then placed on the side of the support mechanism. The control system controls the electric pusher mechanism to reciprocate continuously, and the electric pusher mechanism's push-pull plate to repeatedly compress the inflated armband, thus determining the armband's material properties and pressure-holding performance. While existing armband performance testing equipment meets testing needs to some extent, it still suffers from the following technical drawbacks due to its structural limitations. Specifically, testers obtain pressure data inside the armband by observing the pressure gauge in the pipe connected to the inflation tube and the inflation machine (the pressure gauge's inlet pipe is installed on the side of the test pipe; a drop in pressure data under corresponding conditions indicates air leakage in the armband). Since the internal pressure of the armband differs depending on whether it is compressed or not, the pressure data of the pressure gauge will also differ between the two conditions. Furthermore, testers need to monitor the relevant pressure data in real time, which can cause significant inconvenience to their testing work. When problems occur with the armband for various reasons and the testers do not observe them immediately, the accuracy of the data used to judge the armband's performance cannot be guaranteed. Utility Model Content

[0004] To overcome the shortcomings of existing blood pressure monitor cuff performance testing equipment, which are limited by structure and have the drawbacks described in the background art, this utility model provides a blood pressure monitor cuff performance testing device that, under the joint action of relevant mechanisms, can continuously perform compression tests on the tested cuff, and automatically detect its airtightness when the cuff is compressed to a certain extent. When the tested cuff leaks air, it can automatically alert the testing personnel, thereby bringing convenience to the testing personnel, improving testing efficiency, and ensuring the authenticity and validity of the test data.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A blood pressure monitor cuff performance testing device includes a workbench, an electric linear slide, a pressing plate, a support plate, a PLC, a pressure sensor, and an air compressor, and also has a detection circuit and an alarm circuit. A baffle is installed on the rear end of the workbench, and a fixing groove is provided at the front of the baffle. The pressure sensor is installed in the fixing groove, and the rear side of the support plate is installed on the front side of the baffle. The electric linear slide is installed on the front end of the workbench, and a support frame is installed on the sliding block of the electric linear slide. The pressing plate is installed on the rear end of the support frame. The PLC, detection circuit, and alarm circuit are installed inside the workbench. The signal output terminal of the pressure sensor is electrically connected to the signal input terminal of the detection circuit, and the signal output terminal of the detection circuit is electrically connected to the signal input terminal of the alarm circuit.

[0007] Furthermore, the middle part of the support plate has an open structure.

[0008] Furthermore, the shape of the support plate is consistent with the shape of the arm cuff of the upper arm blood pressure monitor.

[0009] Furthermore, the exhaust pipe of the air compressor's air tank is connected to the inflation pipe of the boom belt.

[0010] Furthermore, the external dimensions of the extrusion plate are smaller than the dimensions of the open portion of the arm belt and support plate.

[0011] Furthermore, the force-bearing surface of the pressure sensor contacts the outer end of the arm strap placed inside the support plate.

[0012] Furthermore, the detection circuit includes an adjustable resistor and a resistor that are electrically connected, with one end of the adjustable resistor connected to one end of the first resistor and one end of the second resistor.

[0013] Furthermore, the alarm circuit includes an electrically connected transistor, a resistor, and a buzzer. One end of the first resistor is connected to the positive power input terminal of the buzzer, the other end of the first resistor is connected to one end of the second resistor and the collector of the first transistor, the other end of the second resistor is connected to the base of the second transistor, the collector of the second transistor is connected to the negative power input terminal of the buzzer, and the emitters of the two transistors are connected.

[0014] Compared with existing technologies, the advantages of this invention are as follows: This invention places the armband to be tested inside a support plate. The PLC controls an electric linear slide to periodically compress and release the inflated armband. During the compression process, the detection circuit, alarm circuit, and pressure sensor work together to check the airtightness of the inflated armband. If the armband leaks air for any reason, it can immediately alert the testing personnel through a buzzer. This invention provides convenience for testing personnel, improves testing efficiency, and ensures the accuracy and validity of the test data. In summary, this invention has good application prospects. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0016] Figure 2 This is a partial structural schematic diagram of the present invention.

[0017] Figure 3 This is the circuit diagram of the present invention. Detailed Implementation

[0018] Figure 1 , 2As shown in Figure 3, a blood pressure monitor cuff performance testing device includes a workbench 1, an electric linear slide M, a compression plate 2, a support plate 3, a PLC, a pressure sensor U2, a power module U1, and an air compressor (not shown in the figure). It also includes a detection circuit 4 and an alarm circuit 5. A baffle 101 is fixedly and vertically mounted on the upper rear side of the workbench 1. A fixing groove 102 is located in the middle front part of the baffle. The pressure sensor U2 is fixedly installed in the fixing groove 102, with the force-bearing surface of the pressure sensor U2 located at the outer front end of the fixing groove 102. The rear end of the support plate 3 is horizontally mounted on the front end of the baffle 101. The electric linear slide M is longitudinally distributed and fixed in the middle of the upper front end of the workbench 1. Two "L"-shaped support frames 6 are fixedly mounted on the left and right ends of the sliding block of the electric linear slide M. The front end of the extrusion plate 2 is fixedly installed on the rear end of the two support frames 6. The PLC, power module U1, detection circuit 4, and alarm circuit 5 are installed on the circuit board inside the workbench 1. The power input terminals 1 and 2 of the power module U1 are connected to the two poles of the AC 220V power supply via wires. The power output terminals 3 and 4 of the power module U1 are connected to the power input terminals 1 and 2 of the PLC via wires. The three power output terminals 3 and 4, 5 and 6, 7 and 8 of the PLC are connected to the positive and negative and negative and positive power input terminals of the electric linear slide M. The power input terminals 1 and 2 of the pressure sensor U2, the other end of the resistor R1 at the power input terminal of the detection circuit, the positive power input terminal of the buzzer BX at the power input terminal of the alarm circuit, and the emitter of the transistor Q2 are connected via wires. The signal output terminal 3 of the pressure sensor U2 is connected to the other end of the adjustable resistor RP1 at the signal input terminal of the detection circuit via wires. The other end of the resistor R2 at the signal output terminal of the detection circuit is connected to the base of the transistor Q1 at the signal input terminal of the alarm circuit via wires.

[0019] Figure 1 , 2As shown in Figure 3, the two ends of the support plate 3 have a "U" shape, and the middle part of the support plate 3 is an open structure 31. The force-bearing surface of the pressure sensor U2 is located in the middle of the support plate 3. The shape of the support plate 3 is consistent with the shape of the arm cuff of the upper arm blood pressure monitor, and the internal dimensions of the support plate 3 are larger than the external dimensions of the arm cuff. The exhaust pipe of the air compressor tank is connected in series with the detection pipe (not shown in the figure) via a manual valve (not shown in the figure). The detection pipe and the inflation pipe of the arm cuff (not shown in the figure) are connected via a high-strength flexible hose (not shown in the figure). The external dimensions of the compression plate 2 are smaller than the dimensions of the arm cuff and the open part in the middle of the support plate 3. The force-bearing surface of the pressure sensor U2 is in contact with the middle of the rear outer end of the arm cuff placed inside the support plate 3. The detection circuit includes an adjustable resistor RP1 and resistors R1 and R2 connected via circuit board wiring. One end of the adjustable resistor RP1 is connected to one end of the first resistor R1 and one end of the second resistor R2. The alarm circuit includes transistors Q1 and Q2, resistors R3 and R4, and a buzzer BX connected via circuit board wiring. One end of the first resistor R3 is connected to the positive power input terminal of the buzzer BX. The other end of the first resistor R3 is connected to one end of the second resistor R4 and the collector of the first transistor Q3. The other end of the second resistor R4 is connected to the base of the second transistor Q4. The collector of the second transistor Q4 is connected to the negative power input terminal of the buzzer BX. The emitters of the two transistors Q3 and Q4 are connected together.

[0020] Figure 1 , 2As shown in Figure 3, before testing, the testing personnel place the armband to be tested on support plate 3, with the rear end of the armband in contact with the front end of the pressure sensor U2. Then, the testing pipe and the armband's inflation pipe (not shown in the figure) are connected via a high-strength flexible hose (the valve of the air compressor's air tank is opened, compressed air enters the armband to fill it with a certain amount of air, and then the valve is closed). After the AC 220V power supply enters the power input terminal of the power module U1, pins 3 and 4 of the power module U1 output a stable DC 12V power supply, which enters the power input terminal of the PLC. After the PLC is powered on, its pins 3 and 4, and pins 5 and 6, will alternately output power for 8 seconds to the positive and negative and negative and positive power input terminals of the electric linear slide M. After the positive and negative terminals of the electric linear slide M are powered on, its sliding block drives the extrusion plate through the support frame to move from front to back to the stop point, extruding the inflated arm belt. After the negative terminals of the electric linear slide M are powered on, its sliding block drives the extrusion plate through the support frame to move from back to front to the stop point, without extruding the inflated arm belt... The above process is continuously cycled, so that the arm belt can be continuously tested for extrusion. After the PLC is powered on, its pins 7 and 8 will cycle through outputting power from its pins 3 and 4 for 6 seconds, and then outputting power for 2 seconds to the power input terminals of the pressure sensor, detection circuit, and alarm circuit (at this time, the rear end of the extrusion plate has already contacted the arm belt and extruded the arm belt slightly). In this way, during the test, the pressure sensor, detection circuit, and alarm circuit will be powered on for 2 seconds each time the arm belt is extruded. During the time that the pressure sensor, detection circuit, and alarm circuit are powered on, if the armband is intact and there is no internal gas leakage, when the extrusion plate squeezes it, a larger pressure will act on the pressure sensor U2. The pressure sensor U2 will then output a relatively high voltage signal to the other end of the adjustable resistor RP1. The voltage signal is divided by the adjustable resistor RP1 and resistor R1, and the voltage is reduced and the current is limited by resistor R2, which enters the base of transistor Q1, which is higher than 0.7V. Transistor Q1 conducts, and the collector outputs a low level that enters the base of transistor Q2. Transistor Q2 is cut off, and the buzzer BX will not be powered on and will not sound, indicating that the armband is in good working order. During the power-on period of the pressure sensor, detection circuit, and alarm circuit, if a problem occurs with the armband and its internal air pressure is low, the pressure plate will compress it. When a relatively small pressure is applied to the force-bearing surface of the pressure sensor U2, the pressure sensor U2 will output a relatively low voltage signal, which will enter the other end of the adjustable resistor RP1. The voltage signal will be divided by the adjustable resistor RP1 and resistor R1, and the voltage will be reduced and the current limited by resistor R2, which will enter the base of transistor Q1 below 0.7V. Transistor Q1 will be cut off, and the collector will stop outputting a low level, which will enter the base of transistor Q2. Transistor Q2 will obtain a suitable forward bias voltage through resistors R3 and R4 to conduct. Then, the collector of transistor Q2 will output a low level, which will enter the negative power input terminal of buzzer BX. Thus, buzzer BX will be powered on and sound to indicate to the tester that the armband performance is poor and there is a leak. After hearing the sound, the tester can stop the test work in time.Through the above, this new invention places the armband to be tested inside the support plate 3. The PLC controls the electric linear slide to squeeze and release the inflated armband at regular intervals. During the squeezing process, the detection circuit, alarm circuit, and pressure sensor can work together to check the airtightness of the inflated armband. If the armband leaks air for any reason, it can immediately alert the tester through a buzzer. This new invention brings convenience to the testers, improves the testing efficiency, and ensures the authenticity and validity of the test data. Figure 3 As shown, power module U1 is a finished product of AC 220V to DC 12V power module; resistors R1, R2, R3, and R4 have resistance values ​​of 2K, 47K, 100K, and 47K respectively; transistors Q11 and Q2 are model 9013 (NPN); buzzer BX is a finished product of model FM12V active continuous sound buzzer alarm; adjustable resistor RP1 has a resistance value of 470K (58.7K in this embodiment); the larger the resistance value, the greater the voltage drop, so that the buzzer BX will not sound when the pressure inside the armband is high, that is, the pressure threshold is set. The pressure threshold is relatively high; the smaller the resistance value is adjusted, the smaller the voltage drop, so the lower the pressure inside the arm belt, the less the buzzer BX will sound (meaning the pressure threshold is set relatively low). Pressure sensor U2 is a miniature weight sensor of model TJ-SR131, which has two power input terminals and one signal output terminal. The greater the pressure detected by the force surface of the weight sensor, the higher the voltage signal output by the signal output terminal, and vice versa. The electric linear slide M is an electric ball screw slide (200W). The PLC model is S7-1500.

[0021] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model.

[0022] Furthermore, it should be understood that although this specification describes the embodiments, the embodiments do not necessarily contain only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A blood pressure monitor cuff performance testing device, comprising a worktable, an electric linear slide, a pressing plate, a support plate, a PLC, a pressure sensor, and an air compressor, characterized in that, It also has a detection circuit and an alarm circuit; a baffle is installed on the rear end of the worktable, and a fixing groove is provided at the front of the baffle. The pressure sensor is installed in the fixing groove, and the rear side of the support plate is installed on the front side of the baffle; the electric linear slide is installed on the front end of the worktable, and a support frame is installed on the sliding block of the electric linear slide, with a pressing plate installed at the rear end of the support frame; the PLC, detection circuit, and alarm circuit are installed inside the worktable, and the signal output terminal of the pressure sensor is electrically connected to the signal input terminal of the detection circuit, and the signal output terminal of the detection circuit is electrically connected to the signal input terminal of the alarm circuit.

2. The blood pressure monitor cuff performance testing device according to claim 1, characterized in that, The middle part of the support plate has an open structure.

3. The blood pressure monitor cuff performance testing device according to claim 1, characterized in that, The shape of the support plate is the same as that of the cuff of the upper arm blood pressure monitor.

4. The blood pressure monitor cuff performance testing device according to claim 1, characterized in that, The exhaust pipe of the air compressor's air tank is connected to the inflation pipe of the boom belt.

5. The blood pressure monitor cuff performance testing device according to claim 1, characterized in that, The external dimensions of the extrusion plate are smaller than the dimensions of the open sections of the arm belt and support plate.

6. The blood pressure monitor cuff performance testing device according to claim 1, characterized in that, The pressure sensor's force-bearing surface contacts the outer end of the arm strap placed inside the support plate.

7. The blood pressure monitor cuff performance testing device according to claim 1, characterized in that, The detection circuit includes an adjustable resistor and a resistor that are electrically connected. One end of the adjustable resistor is connected to one end of the first resistor and one end of the second resistor.

8. The blood pressure monitor cuff performance testing device according to claim 1, characterized in that, The alarm circuit includes electrically connected transistors and resistors, and a buzzer. One end of the first resistor is connected to the positive power input terminal of the buzzer. The other end of the first resistor is connected to one end of the second resistor and the collector of the first transistor. The other end of the second resistor is connected to the base of the second transistor. The collector of the second transistor is connected to the negative power input terminal of the buzzer. The emitters of the two transistors are connected.

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