CN210300996U - Vibration sensor for detecting vibration of organism and fetal heart monitoring device - Google Patents
Vibration sensor for detecting vibration of organism and fetal heart monitoring device Download PDFInfo
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- CN210300996U CN210300996U CN201920169198.4U CN201920169198U CN210300996U CN 210300996 U CN210300996 U CN 210300996U CN 201920169198 U CN201920169198 U CN 201920169198U CN 210300996 U CN210300996 U CN 210300996U
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Abstract
The utility model provides a vibration sensor and child heart monitoring devices for organism vibration detects, child heart monitoring devices includes: the vibration sensor comprises a diaphragm, an amplifying circuit board, a signal processing board and a vibration sensor; the amplifying circuit board is fixedly attached to the diaphragm and connected with the signal processing board through a lead; the vibration sensor includes: the crank arm assembly comprises a supporting arm and a deformation arm, one end of the supporting arm is fixedly connected to the amplifying circuit board, and the other end of the supporting arm is fixedly connected with the deformation arm; a curvature detector mounted to the deformation arm. This child heart monitoring devices's vibration sensor only responds solid contact vibration, and does not respond to the noise in the air, and the deformation of arm can not be brought to sound promptly, consequently monitoring result can not receive the influence of air noise to avoid the interference of air noise to monitoring result, improved the sensitivity of child heart monitoring.
Description
Technical Field
The utility model belongs to the technical field of the sensor, concretely relates to vibration sensor and child heart monitoring devices for organism vibration detects.
Background
Fetal heart is the heart beat of a fetus, and fetal heart monitoring examination is a main detection means for monitoring the condition of the fetus in a uterus and evaluating the intrauterine condition of the fetus. The output result of fetal heart monitoring can be a fetal heart sound signal, a fetal heart rate signal or other signals (fetal heart signals) reflecting fetal heart indexes. The fetal heart sound detection usually adopts a stethoscope principle, and the fetal heart sound is detected and amplified; the heart rate of the fetus is regulated by sympathetic nerves and parasympathetic nerves, the reaction of the fetus heart during fetal movement and uterine contraction can be known by a monitoring graph curve formed by signal tracing instant fetal heart change, so as to speculate whether the fetus in a womb has oxygen deficiency, and the method is a monitoring means widely used in modern obstetrics.
Fetal heart monitoring is realized through fetal heart monitoring devices, and the existing fetal heart monitoring devices can detect fetal heart signals through detecting skin vibration caused by fetal heart sounds. As shown in fig. 1, a typical fetal heart monitoring device of the prior art includes a housing 101, a circuit board 102 mounted within the housing 101, and a microphone 103 mounted on the circuit board 102, the microphone 103 having a diaphragm attached to the circuit board 102. In the using process, the sound wave of fetal heart sound is transmitted to the diaphragm of the microphone 103 through the skin 104, the diaphragm vibrates along with the sound wave, the vibration of the diaphragm can bring capacitance change, the sound pressure change of the fetal heart sound can be detected by detecting the change of the capacitance value, and therefore the fetal heart sound is detected. However, the fetal heart monitoring device in this form is inevitably affected by air fluctuation during use, and is easily interfered, so that the fetal heart determination result is affected.
SUMMERY OF THE UTILITY MODEL
For overcoming at least one problem that exists in the correlation technique to a certain extent at least, the utility model provides a vibration sensor and child heart monitoring devices for organism vibration detects.
In order to solve the above problem, the present invention provides a vibration sensor for detecting vibration of a living body, including:
the crank arm assembly comprises a supporting arm and a deformation arm, wherein one end of the supporting arm is fixedly connected to the amplifying circuit board, and the other end of the supporting arm is fixedly connected with the deformation arm;
and a bending degree detector mounted on the deformation arm.
The embodiment of the utility model provides a vibration sensor, with the solid contact in-process, if the solid takes place to vibrate, the support arm can drive the position that warp the arm and support arm fixed and vibrate from top to bottom (position removal from top to bottom promptly), and warp the part that the arm kept away from the support arm because inertial action can not remove thereupon at once to cause the arm that warp to produce the bending, the bending of warping the arm is detected to the crookedness detector, and the output signal of telecommunication is enlargied by the amplifier circuit board. As long as the resonance frequency of the deformation arm is within the vibration frequency range of the solid (vibration source), the deformation of the deformation arm can be caused, and then the deformation caused by the vibration can be detected by the bending detector, namely the vibration energy is transmitted to the solid and then directly drives the position of the vibration sensor to move, so that the two-time energy transmission interface loss of air is avoided, the energy transmission efficiency is high, and the detection sensitivity is high. In addition, if the solid does not vibrate, the air vibration cannot drive the supporting arm to vibrate, so that the vibration sensor with the structure only responds to the solid contact vibration and does not respond to the noise in the air, namely the sound cannot bring about the deformation of the deformation arm, the monitoring result cannot be influenced by the air noise, the interference of the air noise on the monitoring result is avoided, and the precision of the vibration sensor is improved.
Furthermore, the number of the supporting arms is one, and the deformation arm is a cantilever beam arranged at the end part of the supporting arm.
The structure of the single-arm cantilever beam enables the single-arm cantilever beam to be more sensitive to vibration and easy to respond to vibration to deform, and the detection sensitivity can be further improved.
Furthermore, the free end of the deformation arm far away from the supporting arm is also provided with a mass block.
The mass block is added at the free end, so that the inertia of the free end of the supporting arm is further increased, and the detection sensitivity is improved.
In any of the above embodiments, the bending detector is a piezo-ceramic thin film sensor attached to the deformation arm.
Further, a pin of the piezoelectric ceramic film sensor forms a support arm; or the pin of the piezoelectric ceramic film sensor is fixedly attached to the supporting arm; the pin of the piezoelectric ceramic film sensor is wrapped on the supporting arm.
On the basis of any of the above embodiments, the deforming arm may be parallel to the amplifying circuit board.
On the basis of any embodiment, the deformation arm is made of a non-conductive material, and/or the length of the deformation arm is 3mm-70mm, and the width of the deformation arm is 1mm-20 mm.
In order to solve the technical problem, the utility model also provides a fetal heart monitoring devices, including the vibration sensor of above-mentioned arbitrary embodiment, still include: a membrane; the amplifying circuit board is fixedly attached to the diaphragm; and the signal processing board is connected with the amplifying circuit board through a lead. In the use process, the diaphragm is attached to the belly of a pregnant woman, fetal heart sounds cause belly skin to vibrate, the diaphragm attached to the belly vibrates along with the diaphragm, the diaphragm vibrates to drive the supporting arm mounted on the diaphragm to vibrate up and down synchronously, in the vibration process, the supporting arm can drive the deformation arm to vibrate up and down (namely, the up and down positions move) with the fixed part of the supporting arm, the part of the deformation arm far away from the supporting arm and the mass block (if any) can not move along with the movement of the root of the single-arm beam due to the inertia effect at once, so that the deformation arm is bent, the bending detector detects the bending of the deformation arm, an electric signal is output and amplified by the circuit board, the electric signal is output to the signal processing board for processing, the purpose of fetal heart monitoring can be realized according. As mentioned above, the vibration energy of the skin is transmitted to the diaphragm to directly drive the position of the vibration sensor to move, the loss of the twice energy transmission interface of the sensitive part of the diaphragm-air-sensor is avoided, the energy transmission efficiency is high, and the detection sensitivity is high. In addition, the vibration sensor of the tire core monitoring device only responds to solid contact vibration and does not respond to noise in air, namely sound does not bring deformation of the deformation arm, so that the monitoring result is not influenced by air noise, the interference of the air noise on the monitoring result is avoided, and the monitoring precision is improved.
Further, the fetal heart monitoring device comprises a plurality of vibration sensors, wherein the resonance frequency of each vibration sensor is different and is within the fetal heart frequency range.
The plurality of vibration sensors are arranged to cover the fetal heart frequency range as much as possible, so that the monitoring sensitivity can be further improved.
Further, the support arms are near the center of the diaphragm.
As described above, the vibration of the belly skin drives the diaphragm to vibrate, and it can be understood that the amplitude of the central position of the diaphragm is larger than that of the edge position, so that the supporting arm is approximately close to the central position of the module, and the more sensitive the response of the supporting arm to the vibration and the larger the amplitude, the more the monitoring precision and sensitivity can be further improved.
Further, the signal processing board comprises a signal processing module configured to implement the steps of:
receiving a vibration electric signal sent by an amplifying circuit board; and acquiring a fetal heart signal by using the vibration electric signal.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic structural diagram of a conventional fetal heart monitoring device;
fig. 2 is a schematic structural view of a specific embodiment of the fetal heart monitoring device provided by the present invention.
Description of reference numerals:
in fig. 1:
101-housing 102-circuit board 103-microphone 104-skin
In fig. 2:
1-Membrane
21-circuit board 22-supporting arm 23-deformation arm 24-mass block
3-piezoelectric ceramic film sensor
4-outer cover
5-conducting wire
6-signal processing board
100-human body
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus consistent with certain aspects of the invention, as detailed in the appended claims.
The utility model provides a vibration sensor mainly used child heart monitoring, nevertheless do not get rid of will the utility model provides a sensor is as other application. It should be noted that, all through the vibration detection signal, and need avoid the scene of air noise influence, all can consider using the utility model provides a vibration sensor.
The structure and the implementation principle of the vibration sensor according to the present invention will be described with reference to the fetal heart monitoring apparatus shown in fig. 2. However, the utility model provides a vibration sensor is not restricted to be applied to in the fetal heart monitoring device shown in fig. 2, as mentioned above, also is not restricted to be applied to in the fetal heart monitoring device.
Please refer to fig. 2, fig. 2 is a schematic structural diagram of a fetal heart monitoring device according to an embodiment of the present invention, and fig. 2 also shows a structure of a vibration sensor according to an embodiment of the present invention.
In a specific embodiment, the utility model provides a child heart monitoring devices is including the shell 4 that is used for holding and encapsulates important spare part, install diaphragm 1, amplifier circuit board 21, signal processing board 6 and the vibration sensor on shell 4, and signal processing board 6 passes through wire 5 with amplifier circuit board 7 and is connected. The membrane 1 may be a metal film or a plastic film, and may be laid on the surface of the housing 4 facing the human body 100, or may be a part of the housing 4, that is, the surface of the housing 4 facing the human body 100 is formed by the membrane 1. In the using process, the diaphragm 1 is attached to the belly of a user and synchronously vibrates along with the vibration of the belly, and in order to obtain a good vibration energy transmission effect, the elastic modulus of the diaphragm 1 is close to that of the muscles of the human body 100. The utility model discloses do not carry out concrete the injecing to the elastic modulus value of diaphragm 1, in the practical application, can acquire the human 100 muscle's of target colony standard value through modes such as experiment, emulation to confirm the elastic modulus of diaphragm 1 based on this standard value.
The amplifying circuit board 21 is attached and fixed to the diaphragm 1, and specifically, the amplifying circuit board 21 is attached and fixed to a surface of the diaphragm 1 away from the human body 100 during use.
The vibration sensor includes a crank arm assembly and a bending detector.
In the use, the crookedness detector is installed on warping the arm 23 to detect the deflection (the crookedness promptly) that warp the arm 23, convert the deflection into the signal of telecommunication (the embodiment of the utility model provides a vibration signal of telecommunication) and send for amplifier circuit board 21, after the signal of telecommunication was enlargied to the preamplifier circuit on the amplifier circuit board 21, export for signal processing board 6 through wire 5 and handle. It should be understood that how the amplifying circuit board 21 amplifies the electrical signal and how the bending detector generates and outputs the electrical signal are common knowledge technologies in the electrical control field, and therefore, the circuit layout, the related principle and the implementation manner of the amplifying circuit board 21 and the like refer to the prior art and are not described herein again.
The crank arm assembly includes a support arm 22 and a deformation arm 23, wherein one end of the support arm 22 is fixed to the amplifying circuit board 21, and the other end thereof is fixedly connected to the deformation arm 23. As shown in fig. 2, the bottom of the supporting arm 22 is fixed to the amplifying circuit board 21 and is rigidly connected to the amplifying circuit board 21 integrally so as to move synchronously with the amplifying circuit board 21 in a direction approaching or moving away from the human body 100, and the top of the supporting arm 22 is fixedly connected to the fixed end of the deformation arm 23. The deformation arm 23 is made of a non-conductive material. Specifically, fixed connection structures conventionally used in the field, such as insertion fixing, welding fixing, screw fixing, pin fixing, or adhesive fixing, may be adopted between the bottom of the support arm 22 and the amplification circuit board 21, connection structures, such as insertion fixing, welding fixing, screw fixing, pin fixing, or adhesive fixing, may be adopted between the top end of the support arm 22 and the deformation arm 23, and the support arm 22 and the deformation arm 23 may also be of an integral structure.
In the using process, the membrane 1 is attached to a human body 100 (specifically, the belly of a pregnant woman), fetal heart sounds cause the skin of the belly to vibrate, the membrane 1 attached to the belly vibrates along with the membrane, the membrane 1 vibrates to drive the supporting arm 22 mounted on the membrane to vibrate up and down synchronously, in the vibrating process, the supporting arm 22 can drive the fixed part of the deformation arm 23 and the supporting arm 22 to vibrate up and down (namely, the up and down position moves), the part of the deformation arm 23 far away from the supporting arm 22 cannot move along with the movement of the root of the single-arm beam immediately due to the inertia effect, so that the deformation arm 23 bends, the bending detector detects the bending of the deformation arm 23, outputs an electric signal, the electric signal is amplified by the circuit board 21 and is output to the signal processing board 6 for processing, and the purpose of monitoring the fetal heart can be achieved according. Therefore, the vibration sensor of the tire core monitoring device only responds to solid contact vibration and does not respond to noise in air, namely sound cannot bring deformation of the deformation arm 23, so that the monitoring result cannot be influenced by air noise, the interference of the air noise on the monitoring result is avoided, and the precision of equipment is improved. As long as the resonance frequency of the deformation arm is within the vibration frequency range of the tire core, the deformation of the deformation arm can be caused, and then the deformation caused by the vibration can be detected by the bending detector, so that the high detection sensitivity is realized.
Specifically, the number of the support arms 22 may be one or two, and in order to improve the sensitivity and reduce the material cost while reducing the volume of the apparatus, it is preferable to use one support arm 22. When the supporting arm 22 is one, the deformation arm 23 is a cantilever beam mounted at the end of the supporting arm 22; at this time, one end of the deformation arm 23 is fixed, the other end is suspended and can freely swing in the direction close to or far away from the human body 100, the fixed end of the deformation arm 23 is fixedly connected with the top end of the supporting arm 22, the free end of the deformation arm 23 is suspended, when the supporting arm 22 vibrates up and down along with the diaphragm 1 in the working process, the fixed end of the deformation arm 23 vibrates up and down along with the supporting arm 22, and the free end of the deformation arm 23 has vibration delay under the inertia effect so as to enable the deformation arm 23 to bend and deform. When there are two support arms 22, one end of the deformation arm 23 is fixed to the top end of one support arm 22, and the other end of the deformation arm 23 is fixed to the top end of the other support arm 22, during vibration, the middle position of the deformation arm 23 away from the support arm 22 will be bent and deformed.
Further, when the supporting arm 22 is one, the deformation arm 23 is a cantilever beam structure, and in order to increase inertia, thereby improving bending measurement sensitivity and reducing measurement difficulty, a mass block 24 is further mounted at a free end of the deformation arm 23 away from the supporting arm 22. In the working process, when the supporting arm 22 vibrates, the mass block 24 is pulled to move up and down, and in the process that the mass block 24 is pulled by the bottom of the supporting arm 22 to move up and down, a resonance frequency (resonance frequency) exists, and the resonance frequency is determined by the size and the material of the supporting beam and the weight of the mass block 24.
The shape of the deformation arm 23 can be, but is not limited to, a strip, the length is 3mm-70mm, and the width of the deformation arm 23 is 1mm-20 mm.
For the same purpose, instead of mounting a mass at the free end, the deformation arm 23 may be made of a structure having a weight greater than that of the free end.
Specifically, the bending degree detector is a piezoelectric ceramic thin film sensor 3, the piezoelectric ceramic thin film sensor 3 is attached to the deformation arm 23, and at this time, in order to improve the measurement accuracy, the following structural relationship may be set between the pin of the piezoelectric ceramic thin film sensor 3 and the support arm 22: the pin of the piezoelectric ceramic film sensor 3 forms the supporting arm 22, or the pin of the piezoelectric ceramic film sensor 3 is fixedly attached to the supporting arm 22, or the pin of the piezoelectric ceramic film sensor 3 wraps the supporting arm 22.
In theory, the curvature detector is not limited to the form of the piezoelectric ceramic thin film sensor 3, and may be another structure capable of measuring the curvature, such as a strain gauge attached to the deformation arm 23.
In order to further improve the accuracy and sensitivity of the detection, it is preferable that the deformation arm 23 is parallel or approximately parallel to the diaphragm 1. Of course, if the vibration sensor provided by the embodiment of the present invention is applied to other product structures, the deformation arm 23 may be parallel or approximately parallel to the amplifying circuit board 21.
In addition, it is preferable that the supporting arm 22 is fixed to the middle (central) position of the diaphragm 1 as much as possible to improve the monitoring accuracy and sensitivity as much as possible.
Furthermore, the vibration sensors are multiple, and in the multiple vibration sensors, the resonance frequency of each vibration sensor is different, so that the resonance frequencies of the multiple vibration sensors cover the vibration frequency range of fetal heart sounds as much as possible, the signal acquisition sensitivity is further improved, and the application range of the device is expanded.
Here, the resonance frequency of the vibration sensor may be the resonance frequency of the mass if the mass is attached to the deformation arm 23, or the resonance frequency of the vibration sensor may be the resonance frequency of the deformation arm 23 if the mass is not attached to the deformation arm 23.
The following takes the above-mentioned specific embodiments as examples, briefly describe the utility model provides a fetal heart monitoring device's use: when in use, the membrane 1 is attached to the belly of a pregnant woman, the fetal heart sound causes the skin of the belly to vibrate, and the membrane 1 attached to the belly vibrates along with the vibration; the vibration of diaphragm 1 drives support arm 22 and vibrates from top to bottom, support arm 22 drives the stiff end of cantilever beam and vibrates from top to bottom (upper and lower position removal), and the free end of cantilever beam is furnished with quality piece 24, because quality piece 24's inertia, make the free end of cantilever beam can not remove along with the removal of cantilever beam stiff end at once, thereby cause the bending of cantilever beam, the bending of cantilever beam is detected to PVDF sensor (piezoceramics film sensor 3), the output signal of telecommunication, by circuit board 21 (preamplification circuit) enlargies, the output is handled for signal processing board 6, in order to export the child heart monitoring result that obtains.
Wherein the signal processing board 6 comprises a signal processing module configured to implement the steps of: receiving a vibration electric signal sent by an amplifying circuit board (21); and acquiring a fetal heart signal by using the vibration electric signal.
The fetal heart signal may be, but is not limited to, a fetal heart sound signal, a fetal heart rate signal, or the like.
The signal processing module may be, but not limited to, a microprocessor, an FPGA (Field-Programmable gate Array), a PLC (Programmable Logic Controller), and the like.
There are various specific implementation manners for obtaining the fetal heart signal by using the vibration electrical signal, for example, a fetal heart signal model is trained in advance, and the vibration electrical signal is used as an input of the model, so as to obtain the fetal heart signal.
Wherein, the signal processing board 6 can also be provided with a communication module for sending fetal heart signals and receiving external control commands. The communication module may be, but is not limited to, a bluetooth module, a GPRS module, a WIFI communication module, and the like.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that, in the description of the present invention, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means at least two unless otherwise specified.
The scope of the preferred embodiments of the present invention includes additional implementations in which functions may be performed out of the order shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present invention.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (10)
1. A vibration sensor for vibration detection of a living body, comprising:
the crank arm assembly comprises a supporting arm (22) and a deformation arm (23), one end of the supporting arm (22) is fixedly connected to the amplifying circuit board (21), and the other end of the supporting arm is fixedly connected with the deformation arm (23);
a curvature detector mounted to the deformation arm (23).
2. The vibration sensor according to claim 1, wherein the number of the support arms (22) is one, and the deformation arm (23) is a cantilever beam mounted to an end of the support arm (22).
3. The vibration sensor according to claim 2, characterized in that the free end of the deformation arm (23) remote from the support arm (22) is further fitted with a mass (24).
4. A vibration sensor according to any of claims 1-3, wherein the bending detector is a piezo-ceramic membrane sensor (3), the piezo-ceramic membrane sensor (3) being attached to the deformation arm (23).
5. The vibration sensor according to claim 4, characterized in that the pins of the piezoceramic thin film sensor (3) form the support arms (22); or the pin of the piezoelectric ceramic film sensor (3) is fixedly attached to the supporting arm (22); or the pins of the piezoelectric ceramic film sensor (3) are wrapped on the supporting arm (22).
6. The vibration sensor according to any one of claims 1 to 3, wherein the deformation arm (23) is parallel to the amplification circuit board (21).
7. The vibration sensor according to any of claims 1 to 3, characterized in that the deformation arm (23) is of a non-conductive material and/or that the length of the deformation arm (23) is 3mm to 70mm and the width of the deformation arm (23) is 1mm to 20 mm.
8. A fetal heart monitoring apparatus comprising the vibration sensor of any one of claims 1-7, further comprising:
a membrane (1);
the amplification circuit board (21), the amplification circuit board (21) is fixedly attached to the diaphragm (1);
the signal processing board (6), signal processing board (6) pass through the wire and be connected with amplification circuit board (21).
9. The fetal heart monitoring apparatus of claim 8, wherein the fetal heart monitoring apparatus comprises a plurality of the vibration sensors, each vibration sensor having a different resonant frequency but within a range of fetal heart frequencies.
10. Fetal heart monitoring device according to claim 8, wherein the support arm (22) is close to the centre of the membrane (1).
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| CN201920169198.4U CN210300996U (en) | 2019-01-31 | 2019-01-31 | Vibration sensor for detecting vibration of organism and fetal heart monitoring device |
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| CN201920169198.4U CN210300996U (en) | 2019-01-31 | 2019-01-31 | Vibration sensor for detecting vibration of organism and fetal heart monitoring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109770884A (en) * | 2019-01-31 | 2019-05-21 | 传世未来（北京）信息科技有限公司 | Vibrating sensor and fetal rhythm monitoring device for organism vibration detection |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109770884A (en) * | 2019-01-31 | 2019-05-21 | 传世未来（北京）信息科技有限公司 | Vibrating sensor and fetal rhythm monitoring device for organism vibration detection |
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