Thoracico-abdominal respiratory movement sensor

Abstract

The utility model discloses a thoracico-abdominal breathing motion sensor, which comprises a bridle unit, a piezoelectric unit and a processing unit, the bridle unit comprises a bridle, the bridle is provided with an elastic structure, and two ends of the bridle are detachably and fixedly connected; the piezoelectric unit comprises a piezoelectric film, the piezoelectric film is arranged on the outer side of the bridle in the length direction of the bridle, the two ends of the piezoelectric film are fixedly connected with the bridle, the middle section of the piezoelectric film is bent in the direction away from the bridle, and when the bridle is stretched or contracted, the bending degree of the piezoelectric film is gradually changed. And a changing voltage signal is obtained. The thoracico-abdominal respiratory movement sensor has the advantages that the thoracico-abdominal respiratory movement sensor is used for monitoring thoracico-abdominal respiratory movement of a patient, voltage signals of thoracico-abdominal respiratory movement changes can be directly obtained through the piezoelectric film, and electric signals obtained by processing the obtained thoracico-abdominal respiratory movement signals through multiple rear-end processing procedures are not needed. And data processing is simpler and more convenient.

Description

Technical Field

[0001] This utility model relates to the field of medical equipment technology, and in particular to a chest and abdominal respiratory motion sensor. Background Technology

[0002] Currently, there are two main types of sensors used to detect chest and abdominal respiratory motion waveforms: active sensors and passive sensors. Active sensors are generally embedded small host units, which are more complex in function and have better signal quality, but they also have higher manufacturing costs and are more expensive, making them less than ideal for some applications. Existing passive sensors (such as the chest and abdominal respiratory motion waveform sensor disclosed in application number 201110405576.2) are generally resistive or inductive, acquiring chest and abdominal respiratory motion signals through strain effects or electromagnetic induction. The generated signals require multiple back-end processing steps to become processable electrical signals, and the electrical signals are then processed by circuits to obtain the periodic chest and abdominal respiratory signal waveform, making data processing relatively cumbersome. Utility Model Content

[0003] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a chest and abdominal respiratory motion sensor to solve the technical problem that the existing technology obtains chest and abdominal respiratory motion signals through strain effect or electromagnetic induction, and the generated signals need to go through multiple back-end processing steps to become processable electrical signals, which makes data processing relatively complicated.

[0004] To achieve the above technical objectives, the present invention provides a chest and abdominal respiratory motion sensor, comprising:

[0005] A strap unit, comprising a strap having an elastic structure and having detachable and fixed ends thereof;

[0006] A piezoelectric unit includes a piezoelectric film disposed on the outer side of the belt along the length direction of the belt, with both ends fixed to the belt, and the middle section bent away from the belt. When the belt is stretched or contracted, the curvature of the piezoelectric film gradually changes and a changing voltage signal is obtained.

[0007] The processing unit is electrically connected to the piezoelectric film to convert the voltage signal into a periodic signal waveform of chest and abdominal breathing.

[0008] Furthermore, the strap unit also includes two buckles and a strap. The two buckles are respectively fixed to both ends of the strap. One end of the strap is detachably fixed to one of the buckles, and the other end of the strap is detachably fixed to the other buckle.

[0009] Furthermore, both ends of the strap have hook and loop adhesive surfaces, the middle section of the strap has a hook and loop rough surface, one end of the strap is wrapped around one of the buckles and is attached to the hook and loop rough surface via the corresponding hook and loop adhesive surface, and the other end of the strap is used to wrap around the other buckle and is attached to the hook and loop rough surface via the corresponding hook and loop adhesive surface.

[0010] Furthermore, the distance between the bending inflection point of the piezoelectric film and the strap is greater than 4 mm.

[0011] Furthermore, the piezoelectric film is made of polyvinylidene fluoride, which has piezoelectric properties.

[0012] Furthermore, the piezoelectric unit also includes two electrodes, one end of which is encapsulated in the piezoelectric film at a distance from each other, and the processing unit is electrically connected to the other end of both electrodes.

[0013] Furthermore, both electrodes and the wires are encapsulated within the strap.

[0014] Furthermore, the piezoelectric unit also includes a protective layer, which is disposed on the outside of the piezoelectric film.

[0015] Furthermore, the protective layer is a satin fabric.

[0016] Furthermore, the processing unit is a circuit board, which is fixedly encapsulated within the strap. The two input ports P1 and P2 of the circuit board are electrically connected to the other ends of the two electrodes via wires, and the two output ports P3 and P4 of the circuit board are electrically connected to a second-order passive low-pass filter via wires.

[0017] Compared with the prior art, the beneficial effects of this utility model include: In use, the patient lies supine on the hospital bed, the strap is placed around the patient's body, and the piezoelectric film is positioned at the center of the patient's chest or abdomen. The two ends of the strap are then detachably fixed. When the patient breathes, the chest or abdominal cavity undergoes periodic expansion and contraction. The strap stretches or contracts in response to the chest and abdominal movements. When the strap stretches, the piezoelectric film gradually changes from a bent state to a straight state, and a changing voltage signal is obtained. When the strap contracts, the piezoelectric film gradually changes from a straight state to a bent state, and a changing voltage signal is obtained. The processing unit converts the voltage signal into a periodic chest and abdominal respiratory signal waveform. By using this chest and abdominal respiratory motion sensor to monitor the patient's chest and abdominal respiratory movements, the voltage signal of the chest and abdominal respiratory movements can be directly obtained through the piezoelectric film. This eliminates the need for multiple back-end processing steps to process the obtained chest and abdominal respiratory motion signals into electrical signals, making data processing simpler. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of a chest and abdominal respiratory motion sensor provided by this utility model;

[0019] Figure 2 This is a three-dimensional structural diagram of a chest and abdominal respiratory motion sensor provided by this utility model from another perspective;

[0020] Figure 3 This is a schematic diagram of the structure of the piezoelectric unit in a chest and abdominal respiratory motion sensor provided by this utility model;

[0021] Figure 4 This is a circuit diagram of a circuit board in a chest and abdominal respiratory motion sensor provided by this utility model;

[0022] Figure 5 This is a schematic diagram of the strap structure in a chest and abdominal respiratory motion sensor provided by this utility model;

[0023] In the diagram: 100 - Strap unit, 110 - Strap, 120 - Buckle, 130 - Tie strap, 131 - Hook and loop adhesive surface, 132 - Hook and loop rough surface, 200 - Piezoelectric unit, 210 - Piezoelectric film, 220 - Electrode, 230 - Protective layer, 300 - Processing unit. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining this utility model and are not intended to limit this utility model.

[0025] This invention provides a chest and abdominal respiratory motion sensor, the structure of which is as follows: Figure 1 - Figure 5 As shown, the device includes a strap unit 100, a piezoelectric unit 200, and a processing unit 300. The strap unit 100 includes a strap 110 with an elastic structure, both ends of which are detachably fixed. The piezoelectric unit 200 includes a piezoelectric film 210, which is disposed along the length of the strap 110 on the outer side of the strap 110, with both ends fixed to the strap 110. The middle section is bent away from the strap 110. When the strap 110 is stretched or contracted, the curvature of the piezoelectric film 210 gradually changes, and a changing voltage signal is obtained. The processing unit 300 is electrically connected to the piezoelectric film 210 to convert the voltage signal into a periodic signal waveform of chest and abdominal breathing.

[0026] In use, the patient lies supine on the bed, and the strap 110 is looped around the patient's body, with the piezoelectric film 210 positioned at the center of the patient's chest or abdomen. The two ends of the strap 110 are detachably fixed. When the patient breathes, the chest or abdominal cavity undergoes periodic expansion and contraction. The strap 110 stretches or contracts in response to these chest and abdominal movements. When the strap 110 stretches, the piezoelectric film 210 gradually changes from a bent state to a straight state, generating a changing voltage signal. When the strap 110 contracts, the piezoelectric film 210 gradually changes from a straight state to a bent state, generating a changing voltage signal. The processing unit 300 converts the voltage signal into a periodic chest and abdominal respiratory signal waveform. By using this chest and abdominal respiratory motion sensor to monitor the patient's chest and abdominal respiratory movements, the voltage signal of the chest and abdominal respiratory movements can be directly obtained through the piezoelectric film 210, eliminating the need for multiple back-end processing steps to process the acquired chest and abdominal respiratory motion signals into electrical signals, thus simplifying data processing.

[0027] As a preferred embodiment, please refer to Figure 2 and Figure 4 The strap unit 100 further includes two buckles 120 and a strap 130. The two buckles 120 are respectively fixed to both ends of the strap 110. One end of the strap 130 is detachably fixed to one of the buckles 120, and the other end of the strap 130 is detachably fixed to the other buckle 120. The strap 110 is placed around the patient's body, and the piezoelectric film 210 is located at the center of the patient's chest or abdomen. The other end of the strap 130 is then detachably fixed to the other buckle 120, thereby fixing the strap 110 to the patient's body.

[0028] In a preferred embodiment, the piezoelectric film 210 has a length of 25 mm, a width of 13 mm, and a thickness of 0.3 mm.

[0029] As a preferred embodiment, in order to accommodate the body shape of most people, the length of the strap 110 is 15cm-30cm and the width is 4cm-6cm. The strap 110 is made of wear-resistant elastic fabric.

[0030] In a preferred embodiment, the straps 130 are 90cm, 120cm and 150cm in size to meet the needs of different patients with different body types.

[0031] As a preferred embodiment, please refer to Figure 2 and Figure 4Both ends of the strap 130 have hook and loop fasteners 131, and the middle section of the strap 130 has hook and loop fasteners 132. One end of the strap 130 is wrapped around one of the buckles 120 and is attached to the hook and loop fasteners 132 via the corresponding hook and loop fasteners 131. The other end of the strap 130 is used to wrap around another buckle 120 and is attached to the hook and loop fasteners 132 via the corresponding hook and loop fasteners 131, making it easier to attach and detach the other end of the strap 130 from the other buckle 120.

[0032] As a preferred embodiment, please refer to Figure 1 and Figure 2 The distance between the bending inflection point of the piezoelectric film 210 and the strap 110 is greater than 4 mm, ensuring that the piezoelectric film 210 has sufficient curvature to adapt to changes.

[0033] In a preferred embodiment, the piezoelectric film 210 is made of polyvinylidene fluoride and has piezoelectric properties. The piezoelectric film 210 is a piezoelectric polymer, and the inner coating material is silver or copper-nickel with a coating thickness of 28µm-110µm.

[0034] As a preferred embodiment, please refer to Figure 3 The piezoelectric unit 200 further includes two electrodes 220, one end of which is encapsulated in the piezoelectric film 210 at a distance from each other, and the processing unit 300 is electrically connected to the other end of each of the two electrodes 220.

[0035] As a preferred embodiment, please refer to Figure 2 Both electrodes 220 and the wires are encapsulated within the strap 110, which can protect the two electrodes 220 and the wires.

[0036] As a preferred embodiment, please refer to Figure 2 and Figure 3 The piezoelectric unit 200 further includes a protective layer 230, which covers the outside of the piezoelectric film 210 and can protect the piezoelectric film 210 with the strap 110.

[0037] In a preferred embodiment, the protective layer 230 is a satin fabric, and the piezoelectric film 210 can be protected by the strap 110.

[0038] As a preferred embodiment, please refer to Figure 5The processing unit 300 is a circuit board, which is fixedly encapsulated within the strap 110. The two input ports P1 and P2 of the circuit board are electrically connected to the other ends of the two electrodes 220 via wires, respectively. The two output ports P3 and P4 of the circuit board are electrically connected to a second-order passive low-pass filter via wires. When the piezoelectric film 210 is stretched or bent, a charge signal is generated between the two electrodes 220. The intensity of this charge signal is proportional to the deformation caused by stretching or bending. The piezoelectric film 210 is bent into a certain arc and installed on the elastic strap 110. When the user breathes, the chest or abdominal cavity undergoes periodic expansion and contraction. The strap 110 simultaneously changes with the chest and abdominal movements, and the curvature of the piezoelectric film 210 changes. A changing voltage signal is generated between the two electrodes 220. After the voltage signal is processed by the circuit board, the periodic signal waveform of chest and abdominal breathing can be obtained.

[0039] As a preferred embodiment, please refer to Figure 5 Since the piezoelectric film 210 has a huge output impedance, reaching hundreds of megohms per square centimeter, and the overall output impedance is capacitive, connecting capacitor C1 and resistor R1 in parallel across P1 and P2 helps to improve the output frequency characteristics. The two output ports P3 and P4 of the circuit board are electrically connected to a second-order passive low-pass filter via wires, which can limit high-frequency signals.

[0040] In a preferred embodiment, the circuit board is less than 3cm in length and less than 1cm in width. If the circuit board is too large, it will be easily damaged.

[0041] To better understand this utility model, the following is combined with... Figure 1 - Figure 5 The working principle of the technical solution of this utility model will be described in detail below:

[0042] In use, the patient lies supine on the bed, and the strap 110 is looped around the patient's body, with the piezoelectric film 210 positioned at the center of the patient's chest or abdomen. The other end of the strap 130 is then wrapped around another buckle 120 and attached to the hook-and-loop fastener 132 via the corresponding adhesive side 131. When the patient breathes, the chest or abdominal cavity undergoes periodic expansion and contraction, and the strap 110 stretches or contracts in response to these movements. When the strap 110 stretches, the piezoelectric film 210 gradually changes from a bent state to a straight state. A changing voltage signal is generated between the electrodes 220. When the strap 110 contracts, the piezoelectric film 210 gradually changes from a straight state to a curved state, generating a changing voltage signal between the two electrodes 220. The circuit board converts the voltage signal into a periodic signal waveform of chest and abdominal breathing. By using this chest and abdominal breathing motion sensor to monitor the patient's chest and abdominal breathing motion, the voltage signal of the chest and abdominal breathing motion changes can be directly obtained through the piezoelectric film 210. It is not necessary to process the obtained chest and abdominal breathing motion signal into an electrical signal through multiple back-end processing steps, making data processing simpler.

[0043] The chest and abdominal respiratory motion sensor provided by this utility model has the following beneficial effects:

[0044] (1) Since the piezoelectric film 210 has a huge output impedance, which can reach hundreds of megohms per square centimeter, the overall output impedance is capacitive. Connecting capacitor C1 and resistor R1 in parallel across P1 and P2 is beneficial to improve the output frequency characteristics. The two output ports P3 and P4 of the circuit board are electrically connected to the second-order passive low-pass filter via wires, which can limit high-frequency signals.

[0045] (2) When the patient breathes, the chest cavity or abdominal cavity undergoes periodic expansion and contraction. The band 110 stretches or contracts in response to the chest and abdominal movements. When the band 110 stretches, the piezoelectric film 210 gradually changes from a bent state to a straight state, and a changing voltage signal is generated between the two electrodes 220. When the band 110 contracts, the piezoelectric film 210 gradually changes from a straight state to a bent state, and a changing voltage signal is generated between the two electrodes 220. The circuit board converts the voltage signal into a periodic signal waveform of chest and abdominal breathing.

[0046] (3) By using this chest and abdominal respiratory motion sensor to monitor the patient's chest and abdominal respiratory motion, the voltage signal of the chest and abdominal respiratory motion change can be directly obtained through the piezoelectric film 210. It is not necessary to process the obtained chest and abdominal respiratory motion signal to obtain an electrical signal through multiple back-end processing steps, making data processing simpler.

[0047] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A chest and abdominal respiratory motion sensor, characterized in that, include: A strap unit, comprising a strap having an elastic structure and having detachable and fixed ends thereof; A piezoelectric unit includes a piezoelectric film disposed on the outer side of the belt along the length direction of the belt, with both ends fixed to the belt, and the middle section bent away from the belt. When the belt is stretched or contracted, the curvature of the piezoelectric film gradually changes and a changing voltage signal is obtained. The processing unit is electrically connected to the piezoelectric film to convert the voltage signal into a periodic signal waveform of chest and abdominal breathing.

2. The chest and abdominal respiratory motion sensor according to claim 1, characterized in that, The strap unit also includes two buckles and a strap. The two buckles are respectively fixed to both ends of the strap. One end of the strap is detachably fixed to one of the buckles, and the other end of the strap is detachably fixed to the other buckle.

3. The chest and abdominal respiratory motion sensor according to claim 2, characterized in that, Both ends of the strap have hook and loop adhesive surfaces, and the middle section of the strap has a hook and loop rough surface. One end of the strap is wrapped around one of the buckles and is attached to the hook and loop rough surface via the corresponding hook and loop adhesive surface. The other end of the strap is used to wrap around the other buckle and is attached to the hook and loop rough surface via the corresponding hook and loop adhesive surface.

4. The chest and abdominal respiratory motion sensor according to claim 1, characterized in that, The distance between the bending inflection point of the piezoelectric film and the strap is greater than 4 mm.

5. The chest and abdominal respiratory motion sensor according to claim 1, characterized in that, The piezoelectric film is made of polyvinylidene fluoride and has piezoelectric properties.

6. The chest and abdominal respiratory motion sensor according to claim 1, characterized in that, The piezoelectric unit further includes two electrodes, one end of which is encapsulated in the piezoelectric film at a distance from each other, and the processing unit is electrically connected to the other end of each of the two electrodes.

7. The chest and abdominal respiratory motion sensor according to claim 6, characterized in that, Both electrodes and the wires are encapsulated within the strap.

8. The chest and abdominal respiratory motion sensor according to claim 1, characterized in that, The piezoelectric unit further includes a protective layer, which is disposed on the outside of the piezoelectric film.

9. The chest and abdominal respiratory motion sensor according to claim 8, characterized in that, The protective layer is a satin fabric.

10. The chest and abdominal respiratory motion sensor according to claim 6, characterized in that, The processing unit is a circuit board, which is fixedly encapsulated within the strap. The two input ports P1 and P2 of the circuit board are electrically connected to the other ends of the two electrodes via wires, and the two output ports P3 and P4 of the circuit board are electrically connected to a second-order passive low-pass filter via wires.

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