A portable breathing signal detection device
The portable respiratory signal detection device with a PVDF piezoelectric film sensor and signal conditioning circuit addresses the discomfort and inaccuracy of traditional polysomnography by ensuring secure, accurate breath monitoring and real-time patient tracking.
Patent Information
- Application Number
- CN201810468465.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2018-05-16
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2038-05-16
AI Technical Summary
Existing polysomnography detection instruments for sleep apnea are inconvenient, uncomfortable, and produce inaccurate results due to lead detachment during sleep, affecting patient comfort and test accuracy.
A portable respiratory signal detection device with a PVDF piezoelectric film sensor and signal conditioning circuit, including a high input impedance charge amplifier, dual power supply instrument amplifier, low-pass filters, and a voltage follower, integrated with a skin-friendly gel material for secure attachment and accurate signal processing.
The device provides comfortable, secure attachment and accurate breath monitoring, enabling real-time, remote patient monitoring with reliable detection of apnea events.
Smart Images
Figure CN108392203B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a portable breathing signal detection device, which belongs to portable breathing signal detection equipment. Background Art
[0002] The cause of sleep apnea syndrome is still not fully understood. It can lead to various complications such as hypertension. As the disease progresses, there is even the possibility of sudden death at night. Therefore, it is very necessary to monitor the patient's sleep in real time. Traditional medical polysomnography detection instruments require the test subject to be hospitalized for observation and to wear multiple leads, which are uncomfortable to be tied. Turning over at night can easily cause the leads to fall off, seriously affecting the user's sleep and causing inaccurate test results. Summary of the invention
[0003] The purpose of the present invention is to solve the technical problems of inconvenient detection, affecting patient sleep and inaccurate test results in existing polysomnography detection instruments, and to provide a portable respiratory signal detection device.
[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:
[0005] A portable respiratory signal detection device comprises a respiratory monitoring flexible sensor and a signal conditioning circuit, wherein: the respiratory monitoring flexible sensor is composed of a PVDF piezoelectric film, two signal lines, a plastic substrate and a skin-friendly gel material, the PVDF piezoelectric film is made into an arch structure, bonded to the plastic substrate and embedded in the middle of the skin-friendly gel material, and two electrodes of the PVDF piezoelectric film are respectively connected to the two signal lines; the signal conditioning circuit is composed of a high input impedance charge amplifier circuit, a dual power supply instrument amplifier voltage amplifier circuit, a primary low-pass filter, a secondary low-pass filter and a voltage follower circuit, the signal input end of the high input impedance charge amplifier circuit is connected to the two signal lines of the respiratory monitoring flexible sensor, the signal output end of the high input impedance charge amplifier circuit is connected to the signal input end of the dual power supply instrument amplifier voltage amplifier circuit, the signal output end of the dual power supply instrument amplifier voltage amplifier circuit is connected to the signal input end of the primary low-pass filter, the signal output end of the primary low-pass filter is connected to the signal input end of the secondary low-pass filter, the signal output end of the secondary low-pass filter is connected to the signal input end of the voltage follower circuit, and the signal output end of the voltage follower circuit is connected to the signal acquisition end of a PLC controller.
[0006] Furthermore, the skin-friendly gel material is made of hydrophilic polymer gel.
[0007] Furthermore, the thickness of the PVDF piezoelectric film is 20 μm.
[0008] Furthermore, the span L2 of the arched structure of the PVDF piezoelectric film is 50 mm, the width W2 is 30 mm, and the arch height H is 40 mm.
[0009] The beneficial effects of the present invention are:
[0010] The respiratory monitoring flexible sensor of the present invention can be well attached to the inside of the body, does not irritate the skin, has moderate viscosity, lasting viscosity, good wearing comfort, and high accuracy. Patients will not have any psychological burden when wearing the detection device to sleep, and solve the technical problems of inconvenient detection, affecting patient sleep, and inaccurate test results in existing polysomnography detection instruments. Therefore, compared with the background technology, the present invention has the advantages of simple structure, easy use, and accurate test results.
[0011] In order to verify the beneficial effects of the present invention, it was tested, and the test results are shown in Figure 5 .Depend on Figure 5 It can be seen that in the 10s from 14s to 24s, only one peak value (greater than 4.5V) appeared, and there was only one effective breath, which is quite different from the normal number of breaths (about 3 times), indicating that apnea occurred during this period, and the pause curve is already Figure 5 The apnea signal is accurately recorded and easy to track and analyze. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a structural schematic diagram of the flexible sensor for respiratory monitoring of the present invention;
[0013] In the figure: 1-PVDF piezoelectric film, 2, 3-signal wires, 4-plastic substrate, 5-skin-friendly gel material;
[0014] Figure 2 It is a principle block diagram of the signal conditioning circuit of the present invention;
[0015] Figure 3 Schematic diagram of wearing the flexible sensor for respiratory signals of the present invention;
[0016] Figure 4 It is a waveform diagram of normal breathing measured by the present invention;
[0017] Figure 5 It is a waveform diagram when the present invention measures apnea. DETAILED DESCRIPTION
[0018] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0019] like Figure 1 and Figure 2As shown, a portable respiratory signal detection device in this embodiment includes a respiratory monitoring flexible sensor and a signal conditioning circuit, wherein: the respiratory monitoring flexible sensor is composed of a PVDF piezoelectric film 1, two signal lines 2, 3, a plastic substrate 4 with good recovery elasticity and a skin-friendly gel material 5, the PVDF piezoelectric film 1 is made into an arch structure, bonded to the plastic substrate 4 with good recovery elasticity and embedded in the middle of the skin-friendly gel material 5, and the two electrodes of the PVDF piezoelectric film 1 are respectively connected to the two signal lines 2, 3; the signal conditioning circuit is composed of a high input impedance charge amplifier circuit, a dual power supply instrument amplifier voltage amplifier circuit, a primary low-pass filter, The invention is composed of a secondary low-pass filter and a voltage follower circuit, wherein the signal input end of the high input impedance charge amplifier circuit is connected to the two signal lines of the breathing monitoring flexible sensor, the signal output end of the high input impedance charge amplifier circuit is connected to the signal input end of the dual-power instrument amplifier voltage amplifier circuit, the signal output end of the dual-power instrument amplifier voltage amplifier circuit is connected to the signal input end of the primary low-pass filter, the signal output end of the primary low-pass filter is connected to the signal input end of the secondary low-pass filter, the signal output end of the secondary low-pass filter is connected to the signal input end of the voltage follower circuit, and the signal output end of the voltage follower circuit is connected to the signal acquisition end of the PLC controller.
[0020] The skin-friendly gel material 5 is made of hydrophilic polymer gel, and the length L1 of the skin-friendly gel material 5 is 100 mm and the width W1 is 50 mm.
[0021] The thickness of the PVDF piezoelectric film 1 is 20 μm.
[0022] The span L2 of the arched structure of the PVDF piezoelectric film is 50 mm, the width W2 is 30 mm, and the arch height H is 40 mm. Piezoelectric analysis using ANSYS Workbench 18.0 shows that when the height (arch height) H from the highest point of the PVDF piezoelectric film arched structure to the base is 40 mm, the PVDF piezoelectric film deforms the most, that is, the breathing signal collected by PVDF is the strongest, so the arch height H is designed to be 40 mm.
[0023] The skin-friendly gel material 5 of the respiratory signal detection device of the present invention is pasted on the abdomen of the human body (such as Figure 3 As shown in the figure, the patient's sleeping breathing condition is collected through the PVDF piezoelectric film 1, and the collected signal is transmitted to the signal conditioning circuit through the signal lines 2 and 3. The signal is amplified by the signal conditioning circuit, and a voltage signal of about ±5V is output, which is transmitted to the PLC controller analog signal receiving end. The signal is connected to the Internet through the HINET intelligent gateway, and the data is transmitted to the hospital monitoring center in real time, so as to realize real-time and remote monitoring of the patient's breathing condition and alarm and rescue for abnormal conditions.
[0024] Figure 4 The waveform diagram of normal breathing measured by the present invention is Figure 4 It can be seen that the breathing voltage signal range is between -5V and +5V, and the voltage peak is greater than 4.5V. The breathing interval is about 3s / time. The breathing signal data is accurate and the signal is stable. The amplitude meets the PLC input voltage control requirements and is easy to monitor.
Claims
1. A portable breathing signal detection device, comprising a breathing monitoring flexible sensor and a signal conditioning circuit, characterized in that: The respiratory monitoring flexible sensor is composed of a PVDF piezoelectric film, two signal lines, a plastic substrate and a skin-friendly gel material. The PVDF piezoelectric film is made into an arch structure, bonded to the plastic substrate and embedded in the middle of the skin-friendly gel material. The two electrodes of the PVDF piezoelectric film are respectively connected to the two signal lines; the signal conditioning circuit is composed of a high input impedance charge amplifier circuit, a dual power supply instrument amplifier voltage amplifier circuit, a primary low-pass filter, a secondary low-pass filter and a voltage follower circuit. The signal input end of the high input impedance charge amplifier circuit is connected to the two signal lines of the respiratory monitoring flexible sensor. The signal output end of the anti-charge amplifier circuit is connected to the signal input end of the dual-power instrument amplifier voltage amplifier circuit, the signal output end of the dual-power instrument amplifier voltage amplifier circuit is connected to the signal input end of the primary low-pass filter, the signal output end of the primary low-pass filter is connected to the signal input end of the secondary low-pass filter, the signal output end of the secondary low-pass filter is connected to the signal input end of the voltage follower circuit, and the signal output end of the voltage follower circuit is connected to the signal acquisition end of the PLC controller; the skin-friendly gel material is made of hydrophilic polymer gel, and the respiratory signal detection device is attached to the abdomen of the human body through the hydrophilic polymer gel; The thickness of the PVDF piezoelectric film is 20 μm; The span L2 of the arched structure of the PVDF piezoelectric film is 50 mm, the width W2 is 30 mm, and the arch height H is 40 mm; The output signal of the signal output terminal of the voltage follower circuit is between -5 and +5V, and a voltage peak value greater than 4.5V is an effective breath.