CN115517665A - Ballistocardiogram signal acquisition board - Google Patents
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- CN115517665A CN115517665A CN202211368547.8A CN202211368547A CN115517665A CN 115517665 A CN115517665 A CN 115517665A CN 202211368547 A CN202211368547 A CN 202211368547A CN 115517665 A CN115517665 A CN 115517665A
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- 238000004146 energy storage Methods 0.000 claims description 2
- 239000000919 ceramic Substances 0.000 abstract description 42
- 238000004806 packaging method and process Methods 0.000 abstract description 10
- 230000008054 signal transmission Effects 0.000 abstract description 5
- 238000012360 testing method Methods 0.000 description 37
- 238000002474 experimental method Methods 0.000 description 7
- 230000029058 respiratory gaseous exchange Effects 0.000 description 7
- 230000036387 respiratory rate Effects 0.000 description 6
- 230000035945 sensitivity Effects 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000033001 locomotion Effects 0.000 description 4
- 238000010009 beating Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 241001465754 Metazoa Species 0.000 description 1
- 241000237503 Pectinidae Species 0.000 description 1
- 206010040007 Sense of oppression Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000747 cardiac effect Effects 0.000 description 1
- 230000036461 convulsion Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 235000020637 scallop Nutrition 0.000 description 1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/11—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb
- A61B5/1102—Ballistocardiography
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6887—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient mounted on external non-worn devices, e.g. non-medical devices
- A61B5/6891—Furniture
Abstract
The invention discloses a ballistocardiogram signal acquisition board, belonging to the technical field of medical equipment; the collecting board is arranged under a pillow of a bedside, when the upper cover is pressed by human sleep, the bottom cover is fixed, the upper cover moves downwards under stress, the convex cylindrical surface of the bottom cover contacts with the piezoelectric ceramic piece in the central groove of the upper cover, pressure is transmitted to the piezoelectric ceramic piece, and the piezoelectric ceramic piece collects pressure information and outputs an original signal; by adopting the acquisition board, pressure signals can be quickly and accurately transmitted, a packaging structure of the piezoelectric ceramic piece is omitted, the pressure is directly transmitted to the piezoelectric ceramic piece, and the speed and the accuracy of signal transmission are improved.
Description
Technical Field
The invention belongs to the technical field of medical equipment, and particularly relates to a ballistocardiogram signal acquisition board.
Background
The acquisition of physiological electrical signals is usually applied to animal and human body experiments in medical science, psychology and other disciplines, and is more commonly used in medical multi-parameter monitoring systems and a large number of diagnosis and treatment devices (such as hearts, electroencephalographs, polysomnography and the like).
At present, the real-time monitoring of vital sign signals of various crowds in daily life scenes needs to be realized by means of wearable equipment (such as an electronic bracelet, a neck ring, a vest and the like). But currently, the wearable device is used for acquiring vital sign signals, which mainly has the following defects: 1) The signal electrode needs to be in close contact with the skin of a human body so as to acquire a pressure signal generated by muscles and convert the pressure signal into an electric signal for processing, so that important physiological signals of the human body, such as heartbeat, respiration, twitch and other physiological signals, need to be in close contact with the skin of the human body in the acquisition process of the physiological signals, and bring inconvenience to a user in the use process; 2) When the signal electrode is used for collecting, the signal electrode needs to be pasted on the surface of the skin of a human body, different impedances are possibly formed due to different positions of the skin of the human body pasted at each time and the like, so that the intensity (amplitude) of the collected signal is unstable, and the required physiological signal cannot be accurately collected.
The human body microseismic signal is one of human body physiological signals, is a comprehensive signal containing heartbeat, respiration and other mechanical movements of the body, and can be transmitted through a supporting object in contact with the human body. When sleeping or resting, the pillow is a head support and receives the body vibration signals conducted through the vertebral axis and the body tissues. The continuous heart rate and respiration rate recorder collects body vibration signals by a sensing unit which is placed right below a pillow in bed.
The study and medical applications of microseismic signals of the human body start with the study of Ballistocardiograms (BCG). When the heart beats periodically, the stress of the supporting object contacting with the human body is changed, and the force of the dynamic change is detected and recorded to form the BCG. The BCG records weak vibration caused by the heart pulsation force transmitted to the body surface, and the body surface vibration also contains the components of respiration and other body movements at the same time, so the detected BCG signal not only contains the physiological information of the cardiac cycle and the heart rate, but also contains the physiological information of the respiration, the body movement and the like.
The sensor in the structure of the current ballistocardiogram signal acquisition board needs an additional packaging structure to be packaged and then is pasted on the acquisition board, and the problems of complex manufacturing process, high cost, slow signal transmission speed and poor sensitivity exist.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a ballistocardiogram signal acquisition board which is used for solving the problem of poor sensitivity of the ballistocardiogram signal acquisition board in the prior art.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides a ballistocardiogram signal acquisition board, includes upper cover, elastic device, piezoceramics piece and bottom, is equipped with elastic device between upper cover and the bottom, and upper cover and bottom are close to each other when elastic device is compressed, the lower surface of upper cover is equipped with central recess, and piezoceramics piece fixed mounting is in the central recess department of upper cover, and the upper surface of bottom is equipped with protruding cylinder, and the inner circle area size of piezoceramics piece is agreed with completely to protruding cylinder, and protruding cylinder is located the piezoceramics piece under.
Furthermore, a yielding groove is additionally arranged in the central groove of the upper cover.
Furthermore, the depth of the abdicating groove is 0.1-1mm.
Furthermore, the bottom edge is equipped with the buckle, and the upper cover is equipped with the buckle groove of mutually supporting with the buckle, and buckle movable mounting has the clearance between protruding cylinder and the piezoceramics piece under the condition of not receiving external force after the equipment completion in the buckle inslot.
Further, the gap between the convex cylindrical surface and the piezoelectric ceramic plate is 0.05-2mm.
Further, a horizontal gap of 0.1-1.5mm is reserved between the upper cover and the bottom cover.
Furthermore, the convex cylindrical surface is provided with teeth, and the teeth are in one of an isosceles trapezoid shape, a semicircular shape, a fan shape or a square shape.
Further, the upper cover and the bottom cover are circular, and the diameter of the upper cover and the diameter of the bottom cover are 14cm-18cm.
Further, the elastic device is movably arranged in an elastic device placing groove arranged on the edge of the lower surface of the upper cover.
Further, the elastic device is one of a spring, elastic rubber and a hydraulic energy storage device.
The invention has the beneficial effects that:
according to the invention, the ballistocardiogram signal acquisition board is arranged under the pillow at the bed head, when a human body does not press the upper cover, the convex cylindrical surface does not touch the piezoelectric ceramic piece, when the human body presses the upper cover in sleep, the bottom cover is fixed, the upper cover is stressed to move downwards, the convex cylindrical surface of the bottom cover contacts the piezoelectric ceramic piece positioned in the central groove of the upper cover, pressure is transmitted to the piezoelectric ceramic piece, and the piezoelectric ceramic piece collects pressure information and outputs an original signal; the ballistocardiogram signal acquisition board can quickly and accurately transmit pressure signals, saves a packaging structure of the piezoelectric ceramic piece, directly transmits the pressure to the piezoelectric ceramic piece, improves the speed and the accuracy of signal transmission, has simple preparation process and saves cost.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is an exploded view of one embodiment of a ballistocardiogram signal acquisition board of the present invention;
FIG. 2 is a schematic view of a bottom head with scallops of another embodiment of a ballistocardiogram signal acquisition plate of the present invention;
FIG. 3 is a schematic assembled clearance view of the ballistocardiogram signal acquisition plate of FIG. 1;
FIG. 4 is another directional view of the upper cover of FIG. 1;
FIG. 5 is a comparison diagram of BCG data acquisition in different schemes;
FIG. 6 is a graph illustrating the effect of the gap between the raised cylinder and the piezoceramic wafer on the signal amplitude;
FIG. 7 is a graph of the effect of yielding groove depth on signal amplitude.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1-4, the ballistocardiogram signal acquisition board provided by the invention comprises an upper cover 1, an elastic device 2, a piezoelectric ceramic piece 3 and a bottom cover 4. The lower surface edge of upper cover 1 is equipped with a plurality of elastic device standing grooves 7, and elastic device 2 installs in elastic device standing groove 7, the lower surface of upper cover 1 is equipped with central recess, and piezoceramics piece 3 fixed mounting is in central recess, be provided with the degree of depth in addition in the central recess and be 0.1 mm's recess 8 of stepping down, the recess 8 of stepping down is used for stepping down to the deformation that produces when piezoceramics piece 3 atress. The upper surface of the bottom cover 4 is provided with a convex cylindrical surface 5, the convex cylindrical surface 5 is positioned right below the piezoelectric ceramic piece 3, and the convex cylindrical surface 5 is completely matched with the area of the inner ring of the piezoelectric ceramic piece 3.
Further, the piezoelectric ceramic plate 3 is fixedly installed in the central groove by adopting a glue adhesion or buckle fixing mode. In the illustrated embodiment, the edge of the bottom cover 4 is provided with a buckle 6, the upper cover 1 is provided with a buckle groove which is matched with the buckle 6, and the bottom cover 4 and the upper cover 1 are movably arranged together by matching the buckle 6 and the buckle groove.
Further, after the bottom cover 4 and the upper cover 1 are installed, a proper gap exists between the convex cylindrical surface 5 and the piezoelectric ceramic piece 3, and a proper horizontal gap is reserved between the upper cover 1 and the bottom cover 4, so that a sufficient moving space is ensured between the upper cover and the lower cover, and the stress applied to the piezoelectric ceramic piece 3 by the convex cylindrical surface 5 is not influenced. In the illustrated embodiment, a gap of 0.05mm exists between the convex cylindrical surface 5 and the piezoelectric ceramic piece 3, and a horizontal gap of 0.1mm is reserved between the upper cover 1 and the lower cover 4, so as to ensure that a sufficient moving space is reserved between the upper cover and the lower cover, and the stress applied to the piezoelectric ceramic piece 3 by the convex cylindrical surface 5 is not affected.
In some embodiments, the buckle 6 may be disposed on the upper cover 1, the bottom cover 4 is provided with a buckle groove cooperating with the buckle 6, and the buckle 6 is movably mounted in the buckle groove: through the design, adopt suspension buckle structure to realize being connected between the signal acquisition plate structure, in order to guarantee to have abundant activity space between the lower cover, through with the help of floated sensing structure, can effectively collect the motion that produces to bottom 4 directions after 1 atress of upper cover, the piezoceramics piece 3 that is fixed in the lower surface of upper cover 1 receives protruding cylinder 5 oppression to produce the excitation output signal of telecommunication, upper cover 1 atress disappears or upper cover 1 atress keeps unchangeable time upper cover 1 returns the normal position, obtain accurate signal output.
Further, will gather the board when using and place user's pillow below, so need not to dress and to gather human physiological signal, and this gathers the board based on mechanics principle and material deformation damping principle, set up elastic device 2 and support between upper cover 1 and the bottom 4, through so design, can adjust the distance between upper cover 1 and the bottom 4 better when gathering the board installation stable firm, reduce and gather the high change to the sleep environment of board, the at utmost restraines the uncontrollable interference of family sleep scene.
Furthermore, the upper cover 1 and the bottom cover 4 are circular, the diameter of the assembled product is 14cm, the process cost can be reduced due to the small size of the whole machine, and the portable structure is more convenient to carry and use when going out; the upper cover 1, the bottom cover 4 and the piezoelectric ceramic piece 3 are all round, can stably receive the force transmission in all directions, and ensure the accuracy of the measuring result. In addition, the upper cover 1 and the bottom cover 4 are set to be circular, the supporting force applied to each position of the acquisition board is ensured to be uniform and stable by matching with the elastic devices 2 distributed on the circumference, so that the gap between the convex cylindrical surface 5 and the piezoelectric ceramic piece 3 can be controlled in a small range, the signal acquisition sensitivity of the acquisition board is ensured, and meanwhile, the signal acquisition sensitivity of the acquisition board is improved.
In another embodiment of the invention, the ballistocardiogram signal acquisition board comprises an upper cover 1, an elastic device 2, a piezoelectric ceramic piece 3 and a bottom cover 4; the elastic devices 2 are arranged in four elastic device placing grooves 7 at the edge of the upper cover 1; the piezoelectric ceramic piece 3 is arranged at a central groove of the upper cover 1, and a groove with the depth of 1mm is additionally arranged at the groove position so as to increase the deformation change generated when the piezoelectric ceramic piece 3 is stressed; the protruding cylinder 5 in the bottom 4 agrees with the inner circle area size of piezoceramics piece 3 completely, assemble bottom 4 and upper cover 1 together through the mode that sets up buckle 6, according to the protruding cylinder 5 height of design, after bottom 4 and upper cover 1 equipment are accomplished, there is 1mm clearance between protruding cylinder 5 and the piezoceramics piece 3, remain 1.5mm horizontal gap between design upper cover 1 and the bottom 4, in order to guarantee to have abundant activity space between the lower cover, do not influence the atress of exerting of protruding cylinder 5 to piezoceramics piece 3.
Further, the upper cap 1 and the bottom cap 4 are circular, and the diameter of the assembled product is 18cm.
The convex cylindrical surface 5 on the bottom cover 4 is provided with teeth, the teeth can be in an isosceles trapezoid shape, a semi-circle shape, a sector shape or a square shape, the signal quality and the signal amplitude and the accuracy of data acquisition are best acquired in the sector shape and the square shape, the effect is best, and other shapes can meet the practical use;
furthermore, the teeth arranged on the convex cylindrical surface 5 are distributed in a planar filling array, and the tooth array is designed to be honeycomb-shaped, so that the contact area between the convex cylindrical surface 5 and the piezoelectric ceramic piece 3 can be increased, and the signal acquisition sensitivity is ensured.
The upper cover 1 and the bottom cover 4 are both made of plastic PC plates, a metal material user generally feels that the pillow is too hard when the pillow is placed under the user during signal acquisition, and the pillow gives people a feeling of cold ice when the pillow directly contacts a human body.
When the device is used, the ballistocardiogram signal acquisition board is arranged below a pillow at the head of a bed, when a human body does not press the upper cover 1, the convex cylindrical surface 5 does not touch the piezoelectric ceramic piece 3, when the human body presses the upper cover 1 in sleep, the bottom cover 4 is fixed, the upper cover 1 is stressed to move downwards, the convex cylindrical surface 5 of the bottom cover 4 contacts the piezoelectric ceramic piece 3 positioned in the central groove of the upper cover 1, pressure is transmitted to the piezoelectric ceramic piece 3, and the piezoelectric ceramic piece 3 collects pressure information and converts the pressure signal into a voltage signal to be output; the suspension type sensing structure of the acquisition board can quickly and accurately transmit pressure signals, the pressure can be directly transmitted to the piezoelectric ceramic piece 3, the signal transmission speed, the signal quality, the signal amplitude and the like are improved, the preparation process is simple, the assembly is convenient, and the cost is saved.
The influence of the clearance between the convex cylindrical surface 5 and the piezoelectric ceramic piece 3 on the signal amplitude is evaluated through a comparison experiment:
a special fixed-frequency dotting machine is used, so that a 5g weight vertically strikes on the packaged piezoelectric ceramic plates with different gaps (under the condition of keeping other structural parameters unchanged), the gap setting range is [0,1] mm, the gap interval is 0.05mm, 21 gap indexes are provided, 20 groups of data are measured in each gap, and the amplitude performance quality degree of the piezoelectric ceramic plates with different gaps is reflected by calculating the average value of the data.
As can be seen from the data of fig. 5, the optimum signal amplitude can be obtained when the gap between the convex cylindrical surface 5 and the piezoceramic sheet 3 in the acquisition board is maintained within the range of 0.05-0.25 mm.
The influence of the depths of the different abdicating grooves 8 on the signal amplitude is evaluated through a contrast experiment:
a special fixed-frequency dotting machine device is used, so that a 5g weight vertically strikes the packaged piezoelectric ceramic sheets with different abdicating groove 8 depths (under the condition that other structural parameters are kept unchanged), the setting range of the abdicating groove 8 depths is [0,1] mm, the gap interval is 0.05mm, 21 gap indexes are totally adopted, 20 groups of data are measured in each gap, and the amplitude performance quality degree of the piezoelectric ceramic sheets with different gaps is reflected by calculating the average value of the data.
As can be seen from the data in fig. 6, the optimum signal amplitude can be obtained while maintaining the depth of the relief groove 8 within the range of 0.1-0.3 mm.
And (3) evaluation of a packaging structure and a tooth type comparison experiment:
test group one: by adopting the packaging structure, 5 teeth on the raised cylindrical surface are square grooves;
test group two: by adopting the packaging structure, 5 teeth on the convex cylindrical surface are used as fan-shaped grooves;
test group three: a sensor with an additional packaging structure is adopted;
carrying out signal amplitude comparison test;
TABLE 1, signal amplitude scoring sheet
In order to verify the influence of an additional packaging structure in a sensor on the sensitivity of weak signals, particularly under the same condition, signal acquisition boards in a test group I, a test group II and a test group III are respectively arranged under pillows of a bed head, testers respectively lie on the bed, heads of the testers lean against the pillows, the same signal acquisition processing hardware is used for acquiring BCG signals, and signal amplitudes under corresponding examples are respectively recorded, wherein the specific result of the experiment is as follows:
TABLE 2 Signal amplitude recording sheet
According to the results that the mean values of the central position test results of the signal amplitudes of the first test group and the second test group are 297.2mv and 299.2mv, the signal amplitudes of the first test group and the second test group are 8 scores according to the scores in the table 1, the average amplitude of the third test group is 173.2mv, the average amplitude of the third test group is 6.0, and the difference between the third test group and the second test group is 2 grades; the signal amplitudes of the edge position test results of the first test group and the second test group are 196.1mv and 198.2mv respectively, the signal scores are all grade 6, the average value of the signal amplitudes of the third test group is 80.1mv, and the score grade is 3; the test results of the test group three in the center position and the edge position are not as good as those of the test group one and the test group two.
Signal accuracy contrast test
Under the same condition, using signal acquisition boards in a comparison test group I, a test group II and a test group III to be respectively placed under pillows at a bed head, enabling a tester to respectively lie on the bed, enabling the head of the tester to lean against the pillows, then using a professional contact type testing instrument to measure the pulse beating frequency (pulse beating times per minute) and the respiratory rate (breathing times per minute) of the tester, taking the pulse beating frequency and the respiratory rate measured by the testing instrument as standard comparison values, detecting the tooth shape and adopting a sensor which is sold in the market and has an additional packaging structure, and influencing the data acquisition accuracy in information acquisition; the specific experimental results are as follows:
in the experiment, the accuracy of data acquisition is evaluated by using the variance, and the variance calculation formula is as follows:
The variance values calculated from the results of the experimental recordings in tables 3, 4 and 5 are shown in table 6:
table 3, comparison test set one: heart rate and respiratory rate accuracy test
Table 4, test group two: heart rate and respiratory rate accuracy test
Table 5, test group three: heart rate and respiratory rate accuracy test
TABLE 6 accuracy comparison test results of three sensor schemes
| Variance of heart rate | Variance of respiratory rate | |
| Example 1 | 1.67 | 2.75 |
| Example 2 | 2.11 | 3.15 |
| Example 3 | 7.25 | 9.06 |
As can be seen from the data in tables 3, 4, 5 and 6, when the teeth are designed to be square, the accuracy of data acquisition is highest, and is the second time when the teeth are designed to be fan-shaped, and the signal amplitudes are not greatly different in design, so that the teeth can be used for producing actual products; the reason why the tooth is designed to be square is better probably that when the cross section of the tooth is designed to be square, the tooth is actually in a rectangle with a smaller area when the tooth is contacted with the sensor during pressure fluctuation; when the cross section of the tooth is designed to be fan-shaped, a larger contact area is needed to enable the tooth to be in contact with the sensor, so that a pressure signal is generated; therefore, when the teeth are designed to be square, the accuracy of data acquisition is highest.
Principle of operation
When the invention is used, the ballistocardiogram signal acquisition board is arranged below the pillow at the bed head, when a human body does not press the upper cover, the convex cylindrical surface does not touch the piezoelectric ceramic piece, when the human body presses the upper cover in sleep, the bottom cover is fixed, the upper cover is stressed to move downwards, the convex cylindrical surface of the bottom cover contacts the piezoelectric ceramic piece positioned in the central groove of the upper cover, the pressure is transmitted to the piezoelectric ceramic piece, and the piezoelectric ceramic piece collects pressure information and outputs an original signal; the ballistocardiogram signal acquisition board can quickly and accurately transmit pressure signals, saves a packaging structure of the piezoelectric ceramic piece, directly transmits the pressure to the piezoelectric ceramic piece, improves the speed and the accuracy of signal transmission, has simple preparation process and saves cost.
In the description herein, references to the description of "one embodiment," "an example," "a specific example," 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.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.
Claims (10)
1. The utility model provides a ballistocardiogram signal acquisition board, includes upper cover (1), elastic device (2), piezoceramics piece (3) and bottom (4), is equipped with elastic device (2) between upper cover (1) and bottom (4), and upper cover (1) and bottom (4) are close to its characterized in that each other when elastic device (2) are compressed: the lower surface of upper cover (1) is equipped with central recess, piezoceramics piece (3) fixed mounting is in the central recess department of upper cover (1), and the upper surface of bottom (4) is equipped with protruding cylinder (5), and protruding cylinder (5) agree with the inner circle area size of piezoceramics piece (3) completely, and protruding cylinder (5) are located piezoceramics piece (3) under.
2. A ballistocardiogram signal acquisition board according to claim 1, characterized in that a relief groove (8) is additionally arranged in the central groove of the upper cover (1).
3. A ballistocardiogram signal acquisition board according to claim 1, characterized in that the depth of the relief groove (8) is 0.1-1mm.
4. The ballistocardiogram signal acquisition board according to claim 1, characterized in that the bottom cover (4) is provided with a buckle (6) at the edge, the top cover (1) is provided with a buckle groove which is matched with the buckle (6), the buckle (6) is movably arranged in the buckle groove, and a gap exists between the protruding cylindrical surface (5) and the piezoceramic wafer (3) without external force after the assembly is completed.
5. A ballistocardiogram signal acquisition board according to claim 4, characterized in that the gap between the convex cylindrical surface (5) and the piezoceramics plate (3) is 0.05-2mm.
6. A ballistocardiogram signal acquisition board according to claim 1, characterized in that a horizontal gap of 0.1-1.5mm remains between the upper cover (1) and the bottom cover (4).
7. A ballistocardiogram signal acquisition board according to claim 1, characterized in that the convex cylindrical surface (5) is provided with teeth, and the teeth are in the shape of one of an isosceles trapezoid, a semicircle, a sector or a square.
8. A ballistocardiogram signal acquisition board according to claim 1, characterized in that the upper cover (1) and the bottom cover (4) are circular, and the diameter of the upper cover (1) and the bottom cover (4) is 14cm-18cm.
9. A ballistocardiogram signal acquisition board according to claim 1, characterized in that the elastic means (2) is movably mounted in an elastic means placement groove (7) provided at the lower surface edge of the upper cover (1).
10. A ballistocardiogram signal acquisition board according to claim 1, wherein the elastic means is one of a spring, a resilient rubber and a hydraulic energy storage device.
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| CN202211368547.8A CN115517665A (en) | 2022-11-03 | 2022-11-03 | Ballistocardiogram signal acquisition board |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105877758A (en) * | 2016-03-31 | 2016-08-24 | 德清县德意电脑有限公司 | Ballistocardiogram signal recorder |
| CN205795658U (en) * | 2016-06-20 | 2016-12-14 | 美的集团股份有限公司 | A kind of sleep monitoring device |
| CN107595261A (en) * | 2017-09-27 | 2018-01-19 | 广州中科新知科技有限公司 | A kind of human body vibration signal acquiring board |
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- 2022-11-03 CN CN202211368547.8A patent/CN115517665A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105877758A (en) * | 2016-03-31 | 2016-08-24 | 德清县德意电脑有限公司 | Ballistocardiogram signal recorder |
| CN205795658U (en) * | 2016-06-20 | 2016-12-14 | 美的集团股份有限公司 | A kind of sleep monitoring device |
| CN107595261A (en) * | 2017-09-27 | 2018-01-19 | 广州中科新知科技有限公司 | A kind of human body vibration signal acquiring board |
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Application publication date: 20221227 |