Low-power-consumption respiration induction plethysmography device
By designing a low-power breath sensing plethysmographic device with a signal processing circuit including asynchronous counter, inverter, MOS tube and oscillator, the problem of complex structure and high power consumption of high-frequency excitation source circuits in the prior art is solved, and low-power consumption and miniaturized breath waveform detection is achieved, which improves portability.
Patent Information
- Application Number
- CN202420681377.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-03
- Publication Date
- 2025-05-06
- Estimated Expiration
- 2034-04-03
AI Technical Summary
The high-frequency excitation source circuit of the existing breath sensing plethysmographic device has a complex structure and high power consumption, resulting in high manufacturing cost and poor portability.
A low-power breath sensing plethysmography device is designed, and a signal processing circuit consisting of an asynchronous counter, inverter, MOS tube and oscillator is connected to the signal processor through a conductor to realize low-power breath waveform detection.
A breath-sensitive plethysmographic device with low power consumption and miniaturization is realized, which simplifies the structure, reduces manufacturing costs, and improves portability.
Smart Images
Figure CN222828588U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of medical monitoring, and in particular relates to a low-power consumption respiratory induction plethysmography device. Background Art
[0002] As a non-invasive respiratory detection technology, respiratory induction plethysmography is widely used in the field of chest and abdominal respiratory movement waveform detection. The detection principle of respiratory induction plethysmography is to sew a wire coil bent into a wavy or "sinusoidal" shape into an elastic band, and use the wire as the inductance element of a capacitive three-point resonant circuit. When the human body produces respiratory movements, the chest and / or abdomen produce periodic fluctuations, causing the inductance value of the wire to change periodically. The change in the inductance value of the wire will cause the resonance point to change. The change in the self-inductance of the coil is detected through frequency discrimination or detection, thereby realizing the conversion of chest and abdominal respiratory waves. The wire can also be used as a purely inductive load, and high-frequency excitation is applied at both ends to detect the waveform changes at both ends.
[0003] All of the above methods require applying high-frequency excitation current at both ends of the wire. The existing high-frequency excitation source requires a separate excitation source circuit. The circuit structure is relatively complex and the power consumption is high, which makes the manufacturing cost of respiratory induction volume recording higher. The entire processing circuit is also large in size and can only be used in a specific place, with poor portability. Utility Model Content
[0004] In order to improve the deficiencies of the prior art, the utility model provides an ultra-low power consumption respiratory induction plethysmography device, which not only has low energy consumption but also has a small size.
[0005] As mentioned above, a low-power respiratory induction volume plethysmography device includes an elastic band, the inner surface of the elastic band is provided with a conductive coil, the conductive coil is wavy or "sinusoidal", and the elastic band can undergo elastic deformation under the action of an external force. The device also includes a signal processor, the signal processor is connected to the conductive coil, the signal processor includes a signal processing circuit, the signal processing circuit includes an asynchronous counter, an inverter, a MOS tube and an oscillator, the conductive coil is connected to the frequency signal input end of the counter, and at the same time, the conductive coil is also connected to the reverse output end and input end of the inverter, the drain of the MOS tube is connected to the GND of the inverter, and the gate of the MOS tube is connected to the oscillator.
[0006] Preferably, both ends of the conductive coil are provided with fasteners, the fasteners are made of conductive material, and the fasteners are connected to the signal processor via a wire P2.
[0007] Preferably, the elastic band comprises two ends connected to each other, and the two ends are provided with connecting pieces that fit together with each other, and the elastic band is connected and fixed to the user through the connecting pieces.
[0008] Preferably, the elastic band is also provided with a buckle, and the connecting piece can be snapped into the buckle to adjust the length of the elastic band.
[0009] Preferably, the asynchronous counter is selected from the stage asynchronous binary counter 74HC4040, the inverter is selected from the inverter 74HC04, the MOS tube is selected from the low-voltage N-channel MOS tube, and the oscillator is selected from the multivibrator HEF4538.
[0010] Preferably, the conductive coil is connected to the frequency signal input terminal CP# of the 12-stage asynchronous binary counter 74HC4040 through the conductive wire P2, and is also connected to the reverse output terminal Y3 and the input terminal A3 of the inverter 74HC04, the drain of the low-voltage N-channel MOS tube is connected to the GND of the inverter 74HC04, and the gate of the low-voltage N-channel MOS tube is connected to the Q# pole of the multivibrator HEF4538.
[0011] Beneficial Effects
[0012] The utility model discloses a low-power consumption respiratory induction volume plethysmography device, comprising an elastic band, wherein a conductive coil is arranged on the inner surface of the elastic band, wherein the conductive coil is in a wave shape or a "sinusoidal" shape, and the elastic band can be elastically deformed under the action of an external force. The utility model also comprises a signal processor, wherein the signal processor is connected to the conductive coil, and when the conductive coil follows the chest and abdomen respiratory movement, the coil self-inductance will change periodically so that the resonant frequency will change, and after the counter divides the frequency, the frequency change of the multivibrator output that follows the change is obtained, and the corresponding chest and abdomen respiratory waveform can be obtained by low-pass filtering and amplification processing of the frequency signal of the post-stage circuit. The utility model has a simple structure and low energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a schematic diagram of the structure of a low-power respiratory induction plethysmography device;
[0014] Figure 2 It is a schematic diagram of the structure in which the conducting coil is connected to the signal processor via a fastener;
[0015] Figure 3 The circuit diagram of the signal processing circuit.
[0016] 1-conductor coil, 2-fastener, 3-clip, 4-conducting wire, 5-signal processor. DETAILED DESCRIPTION
[0017] The structure of the present utility model will be further described in detail below in conjunction with specific embodiments. It should be understood that the following embodiments are only exemplary descriptions and explanations of the present utility model, and should not be interpreted as limiting the scope of protection of the present utility model. All technologies implemented based on the above content of the present utility model are included in the scope of protection intended by the present utility model.
[0018] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. 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 direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.
[0019] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0020] Example 1
[0021] like Figure 1 As shown, a low-power respiratory induction plethysmography device in this embodiment includes an elastic band 6, and a conductive wire coil 1 is provided on the inner surface of the elastic band 6. The conductive wire coil 1 is wavy or "sinusoidal" in shape. The elastic band 1 can be elastically deformed under the action of external force. When it is sleeved on the chest and / or abdomen of a user, it can be deformed according to the body shape of the user, so that the conductive wire 6 is tightly attached to the surface of the user's body.
[0022] The elastic band 6 includes two interconnected ends, and the two ends are provided with connecting pieces that cooperate with each other. The elastic band 6 is connected and fixed to the user through the connecting pieces; the two ends of the conductor coil 1 on the elastic band 6 are provided with fasteners 2, and the fastener 2 is made of conductive material. The elastic band 6 is also provided with a buckle 3, and the connecting piece can be snapped into the buckle 3 to adjust the length of the elastic band 6. The buckle 3 is detachably connected to the elastic band 6, and the actual use length of the elastic band 6 can be changed by changing the position of the buckle 3 on the elastic band 6.
[0023] See also Figure 2As shown, the end of the wire coil 1 is welded together with the fastener 2 and fixed on the elastic band 6. The low-power respiratory induction plethysmography device also includes a signal processor 7, which is connected to the wire coil 1 on the elastic band 6 through the fastener 2. Specifically, the fastener 2 is connected to the signal processor 7 through a wire P2.
[0024] Among them, the signal processor 7 includes a signal processing circuit, which includes an asynchronous counter, an inverter, a MOS tube and an oscillator, wherein the asynchronous counter is selected from a 12-level asynchronous binary counter 74HC4040, the inverter is selected from an inverter 74HC04, the MOS tube is selected from a low-voltage N-channel MOS tube, and the oscillator is selected from a multivibrator HEF4538.
[0025] like Figure 3 As shown, the conductive coil 1 is connected to the frequency signal input terminal CP# of the 12-stage asynchronous binary counter 74HC4040 through the conductive wire P2, and is also connected to the reverse output terminal Y3 and the input terminal A3 of the inverter 74HC04. The drain of the low-voltage N-channel MOS tube is connected to the GND of the inverter 74HC04, and the gate of the low-voltage N-channel MOS tube is connected to the Q# pole of the multivibrator HEF4538.
[0026] When the conducting coil 1 is not connected, the gate voltage of the MOS tube is the high level output by the Q# pole of the multivibrator, and the MOS tube is turned on. The inverter input terminal A3 is low level, the output terminal Y3 is high level, and the 12-level asynchronous binary counter frequency signal input terminal CP# is high level. At this time, it cannot play a frequency division role, and MP will not be cleared, and the power consumption level of the entire circuit is the lowest.
[0027] The moment the conductor coil 1 is connected through the wire P2, the inverter works, and the inverter output terminal Y3 continues to generate level flipping. The 12-level binary counter counts the 256-divided frequency signal of the output terminal Y3 flipping frequency; when the 12-level binary counter Q8 outputs a high-level divided signal, the multivibrator Q outputs a high-level clear counter and outputs Q#. Since the resonant resistor is set to a large value, the current on the resistor is very weak, and the overall power consumption of the module is maintained at around 15uA.
[0028] When the elastic band 6 follows the chest and abdominal breathing movement, the self-inductance of the conductor coil 1 will change periodically, causing the resonant frequency to change. After being divided by a counter, the frequency change of the multivibrator output that follows the change is obtained. This changing frequency signal can be low-pass filtered and amplified by the subsequent circuit to obtain the corresponding chest and abdominal breathing waveform.
[0029] The above examples illustrate the specific implementation of the present invention. However, the protection scope of the present invention is not limited to the above-mentioned exemplary implementation. Any modification, equivalent replacement, improvement, etc. made by those skilled in the art within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.
Claims
1. A low power consumption respiratory induction plethysmography device, comprising an elastic band, characterized in that: The inner surface of the elastic band is provided with a conductive coil, and the conductive coil is wavy or "sinusoidal". The elastic band can undergo elastic deformation under the action of external force. The device also includes a signal processor, which is connected to the conductive coil. The signal processor includes a signal processing circuit, and the signal processing circuit includes an asynchronous counter, an inverter, a MOS tube and an oscillator. The conductive coil is connected to the frequency signal input end of the counter. At the same time, the conductive coil is also connected to the reverse output end and input end of the inverter. The drain of the MOS tube is connected to the GND of the inverter, and the gate of the MOS tube is connected to the oscillator.
2. The low power consumption respiratory induction plethysmography device according to claim 1, characterized in that: Both ends of the conductor coil are provided with fasteners, which are made of conductive material and are connected to the signal processor via a wire P2.
3. The low power consumption respiratory induction plethysmography device according to claim 1, characterized in that: The elastic band comprises two ends connected to each other, and the two ends are provided with connecting pieces that match each other. The elastic band is connected and fixed to the user through the connecting pieces.
4. The low power consumption respiratory induction plethysmography device according to claim 3, characterized in that: The elastic band is also provided with a buckle, and the connecting piece can be snapped into the buckle to adjust the length of the elastic band.
5. The low power consumption respiratory induction plethysmography device according to claim 2, characterized in that: The asynchronous counter is selected from the stage asynchronous binary counter 74HC4040, the inverter is selected from the inverter 74HC04, the MOS tube is selected from the low-voltage N-channel MOS tube, and the oscillator is selected from the multivibrator HEF4538.
6. The low power consumption respiratory induction plethysmography device according to claim 5, characterized in that: The conductive coil is connected to the frequency signal input terminal CP# of the 12-stage asynchronous binary counter 74HC4040 through the conductive wire P2, and is also connected to the reverse output terminal Y3 and the input terminal A3 of the inverter 74HC04. The drain of the low-voltage N-channel MOS tube is connected to the GND of the inverter 74HC04, and the gate of the low-voltage N-channel MOS tube is connected to the Q# pole of the multivibrator HEF4538.