CN107692985B - Undisturbed human physiological signal acquisition belt - Google Patents
Undisturbed human physiological signal acquisition belt Download PDFInfo
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- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
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- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/08—Detecting, measuring or recording devices for evaluating the respiratory organs
- A61B5/0816—Measuring devices for examining respiratory frequency
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- 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
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Abstract
The invention provides an undisturbed human physiological signal acquisition belt, which comprises: lower piece subassembly, last piece subassembly and piezoelectric film, the piezoelectric film centre gripping is between lower piece subassembly and last piece subassembly, be provided with signal output seat on an end of lower piece subassembly, be provided with the signal lead-out wire on an end of piezoelectric film, the signal lead-out wire is connected with signal output seat, lower piece subassembly edge is provided with the recess, last piece subassembly edge that corresponds with it is provided with the arch, glue has been placed in the recess, bond through glue between arch and the recess, be provided with the tooth of equidistance interval distribution side by side on the internal surface that has at least one subassembly and piezoelectric film among lower piece subassembly and the last piece subassembly to contact. This human physiology signal acquisition area of undisturbed formula adopts the adhesive structure to realize the connection between the signal acquisition band structure, and need not to dress and to gather human physiology signal to the mode through tooth pressure contact piezoelectric film gathers the sign signal, can improve the degree of accuracy of data acquisition.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to an undisturbed human body physiological signal acquisition belt.
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 medical 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 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, are acquired, and need to be in close contact with the skin of the human body in the acquisition process of the physiological signals, so that inconvenience is brought to a user in the use process; 2) the signal electrode is required to be adhered to the surface of human skin during collection, different impedances are possibly formed due to different positions of the adhered human skin at each time and other reasons, so that the intensity (amplitude) of the collected signal is unstable, and the required physiological signal cannot be accurately collected.
In view of the above-mentioned drawbacks, some corresponding studies have been conducted at home and abroad, for example, the publication numbers are: chinese patent application CN102319057A discloses a "wave-shaped physiological signal acquisition device and physiological signal acquisition mattress", the device includes: the device comprises a wave-shaped flexible body, a tensile force sensor and a signal processing unit; the wave-shaped flexible body comprises a flexible body panel and a convex flexible body, and the convex flexible body is arranged on the flexible body panel and converts the borne human body pressure into stretching force; the tensile force sensor is arranged in the flexible body panel and generates an electric signal according to the tensile force; and the signal processing unit processes the electric signal to obtain a physiological signal of the human body. The device converts the human body pressure into an electric signal through the wavy flexible body and processes the electric signal, so that the physiological signal of the human body can be acquired in daily life in a mode of not directly contacting with the skin of the human body, and the acquisition of the physiological signal is more convenient; meanwhile, the acquired physiological signals are transmitted to the remote equipment by using a wireless technology, and the operations of signal acquisition, further analysis, unified storage and the like are separated, so that the acquisition of the physiological signals is further facilitated. However, the device in the patent is not sensitive to the variation of the tiny pressure because the deformation of the convex flexible body is used for converting the human body pressure into the stretching force and then converting the stretching force into the electric signal, and once the tiny pressure fluctuation generated by the breathing, the pulse or the heartbeat because of the variation is not enough to cause the deformation of the convex flexible body, the device can not accurately acquire the sign signals, and the sensitivity of the stretching signal acquisition is far lower than that of the pressure touch signal acquisition.
For another example: the publication number is: CN104013392A, chinese patent application, discloses a human body physiological signal acquisition device and system, the device comprises a flexible pad with rough surface, which can generate self-locking effect with rough surface, a piezoelectric film sensor, a signal acquisition processor and a signal output interface; the flexible cushion body is provided with an interlayer, the piezoelectric film sensor is arranged in the interlayer, the piezoelectric film sensor is connected with the signal acquisition processor, and the signal acquisition processor is connected with the signal output interface; the sensor is arranged on a soft bed or a soft sofa, the sensor needs to be arranged below a bed sheet or a sofa cushion, the upper part and the lower part of the bed sheet or the sofa cushion are made of fabrics with rough surfaces, when the sensor is used by a person, the piezoelectric film sensor is downwards deformed under pressure, and due to the self-locking effect, the pressed point and other positions are pulled to generate electric signals, the electric signals are collected and processed into human physiological signals by the signal collection processor, and the human physiological signals are output by the signal output interface. The device forms a human physiological signal acquisition device and a system thereof through a flexible cushion body with a rough surface and an interlayer and a piezoelectric film sensor arranged in the interlayer, when the flexible cushion body is arranged on soft objects such as a sofa, a mattress and the like, when the objects are pressed on the flexible cushion body, the stress point of the flexible cushion body can be stretched and deformed, so that the piezoelectric film sensor in the interlayer can acquire the tension change, and the flexible cushion body in the invention uses the rough surface, when the objects are pressed on the flexible cushion body, the flexible cushion body can generate larger friction force with the mattress to generate a self-locking effect, so that the piezoelectric film sensor can acquire the repeatedly stretching force with small amplitude, thereby accurately acquiring the change of the human physiological signals. However, in the patent application, the surface of the flexible cushion body is rough, but the contact surface of the flexible cushion body and the piezoelectric film sensor is smooth, the working principle of the device is that the piezoelectric film sensor collects the stretching deformation of the stress point of the flexible cushion body to collect signals, and the device can not accurately collect the physical sign signals if the tiny pressure fluctuation generated by respiration, pulse or heartbeat due to the fluctuation is not enough to cause the stretching deformation of the stress point.
In addition, the human physiology signal acquisition device that adopts in the existing market generally adopts the screw to carry out the fastening connection of device, though made things convenient for signal acquisition device's dismouting, through the research discovery, because the screw is the metal device, and the collection of human physiology signal is generally to change pressure signal into little electric signal, and the existence of metal can lead to the fact certain influence to little electric signal's collection and change, especially in this kind of precision equipment of physiology signal acquisition, can lead to the fact great harmful effects on signal acquisition's accuracy.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the undisturbed human body physiological signal acquisition belt, the connection between the signal acquisition belt structures is realized by adopting an adhesive structure, the human body physiological signal can be acquired without wearing, and the acquisition belt acquires the physical sign signal by adopting a mode that teeth are pressed and pressed on a piezoelectric film, so that the accuracy of data acquisition can be improved.
In order to realize the technical scheme, the invention provides an undisturbed human physiological signal acquisition belt, which comprises: lower piece subassembly, last piece subassembly and piezoelectric film, the piezoelectric film centre gripping is between lower piece subassembly and last piece subassembly, be provided with signal output seat on the tip of lower piece subassembly, be provided with signal outgoing line on the tip of piezoelectric film, signal outgoing line is connected its characterized in that with signal output seat: the piezoelectric film packaging structure is characterized in that a groove is formed in the edge of the lower piece assembly, a protrusion is arranged at the edge of the upper piece assembly corresponding to the groove, or a protrusion is arranged at the edge of the lower piece assembly, a groove is formed in the edge of the upper piece assembly corresponding to the lower piece assembly, glue is placed in the groove, the protrusion and the groove are bonded through the glue, and teeth which are distributed in parallel and equidistantly are arranged on the inner surface, in contact with the piezoelectric film, of at least one of the lower piece assembly and the.
In actual assembling process, only need to place piezoelectric film between lower part subassembly and last piece subassembly, then with the recess of lower part subassembly edge or protruding and last piece subassembly edge corresponding arch or recess align can, glue through the recess realizes the bonding between lower part subassembly and the last piece subassembly, therefore, both realized the bonding between lower part subassembly and the last piece subassembly, sealed between lower part subassembly and the last piece subassembly has been strengthened again, and avoided using the metal, thereby avoided the existence of metal to the collection of little electrical signal and the harmful effects that the transformation caused, the accuracy of data acquisition has been strengthened. In actual use, only need place this signal acquisition area in the mattress, pillow or cushion, need not with human skin direct contact, when human pressure changes, can be automatic through the tooth and the piezoelectric film contact that set up on the lower part subassembly of signal acquisition area or the last subassembly and produce pressure signal, the lower part subassembly and the last subassembly of this signal acquisition area are made by flexible material, and the piezoelectric film centre gripping is between lower part subassembly and last subassembly, even consequently only breathe, pulse or heartbeat produce weak vibration signal because of the change, also can touch the tooth that the side by side equidistance interval distribution that intensive set up on lower part subassembly or the last subassembly, touch the piezoelectric film through the tooth and produce timely pressure signal. So, for traditional collection signal through producing deformation, this device touches weak vibration signal of collection that presses piezoelectric film collection signal can be more accurate through the tooth to improve the degree of accuracy of data collection.
Preferably, a gap of 0.2-0.3 cm is reserved at the bottom end of the groove matched with the protrusion and used for containing glue, the glue can be effectively prevented from overflowing, and meanwhile, the sealing performance between the lower piece assembly and the upper piece assembly can be enhanced through glue curing.
Preferably, the inner surfaces of the lower sheet assembly and the upper sheet assembly are respectively provided with teeth which are distributed side by side at equal intervals, and the teeth arranged on the inner surface of the lower sheet assembly and the teeth arranged on the inner surface of the upper sheet assembly are distributed in a staggered manner. Experiments prove that when the teeth arranged on the inner surface of the lower piece assembly and the teeth arranged on the inner surface of the upper piece assembly are distributed in a staggered mode, the sensing of weak vibration signals is the most sensitive, and the accuracy of data acquisition is the highest.
Preferably, the cross section of the tooth is trapezoidal, semicircular, triangular or square. In the actual detection process, when the cross section of the teeth is designed to be trapezoidal, semicircular, triangular or square, the accuracy of data acquisition can meet the actual use, wherein the effect is best when the cross section of the teeth is designed to be isosceles trapezoid, and when the cross section of the teeth is designed to be isosceles trapezoid, the weak vibration signals of a human body can be well conducted, and the piezoelectric film can be well protected from being damaged due to tooth pressure.
Preferably, the tooth width a of the isosceles trapezoid teeth is 0.4-2mm, the tooth height h is 0.5-1mm, and the distance d between every two adjacent teeth is 4-8 mm. More preferably, the tooth width a of the isosceles trapezoid teeth is 0.8mm, the tooth height h is 0.8mm, and the distance d between two adjacent teeth is 6 mm. Experiments prove that when the shape of the teeth is designed to be isosceles trapezoid, the tooth width a of the isosceles trapezoid teeth is 0.8mm, the tooth height h is 0.8mm, and the distance d between every two adjacent teeth is 6mm, the acquired data is most accurate, and the damage to the piezoelectric film is small.
Preferably, the signal outgoing line of piezoelectric film adopts the silica gel line, and the silica gel line adopts the S type to walk the line, and this kind of design has increased the frictional force between silica gel line and the lower plate subassembly, when external force is exerted on the silica gel line, can the auxiliary protection piezoelectric film, prevents that the piezoelectric film atress from being broken by the stretch.
Preferably, the front end and the rear end of the inner surface of the lower sheet assembly are both provided with positioning columns, the front end and the rear end of the piezoelectric film are provided with positioning holes corresponding to the positioning columns, the positioning holes are long holes with the length of 2-4mm, and the piezoelectric film can be movably fixed between the lower sheet assembly and the upper sheet assembly through the matching between the positioning columns and the positioning holes. The positioning holes are designed into long holes with the length of 2-4mm, so that the piezoelectric film can be positioned, and meanwhile, the piezoelectric film can be provided with a movable space with the length of 2-4mm at the horizontal position, and the piezoelectric film can be prevented from being torn due to the change of the stressed and stretched length of the piezoelectric film.
Preferably, the lower plate component and the upper plate component are made of silica gel materials with different hardness degrees, and the lower plate component is softer than the upper plate component. The upper plate component has higher hardness, is beneficial to better conducting weak vibration signals of a human body, reduces the loss of the signals in the material of the upper plate component, and the lower plate component has softer hardness, is beneficial to better touching and pressing the piezoelectric film by the conducted vibration signals so as to output high-quality signals (signals with high strength and obvious characteristics).
The undisturbed human physiological signal acquisition belt and the system provided by the invention have the beneficial effects that:
1) the undisturbed human physiological signal acquisition belt realizes the adhesion between the lower piece assembly and the upper piece assembly through the glue arranged in the groove at the edge of the lower piece assembly or the upper piece assembly, so that the adhesion between the lower piece assembly and the upper piece assembly is realized, the sealing between the lower piece assembly and the upper piece assembly is enhanced, and the use of metal is avoided, thereby avoiding the adverse effect of the existence of the metal on the acquisition and the transformation of a micro-electric signal and enhancing the accuracy of data acquisition;
2) this human physiological signal of undisturbed area gathers the collection that the pressure oscillation realization was to human physiological signal through gathering the human body, need not to dress and can gather human physiological signal, and through setting up tooth and the piezoelectric film contact on lower part subassembly or last part subassembly and produce pressure signal, even only breathe, pulse or heartbeat produce weak vibration signal because the change, also can touch the tooth that the side by side equidistance interval distribution that the intensive setting was gone up on lower part subassembly or last part subassembly, touch through the tooth and press the piezoelectric film and produce timely pressure signal, gather the signal through producing deformation for in the traditional physiological signal collection device, this device touches the collection weak vibration signal that the piezoelectric film collected the signal can be more accurate through the tooth, thereby improve the degree of accuracy of data collection. Meanwhile, through the design of the shape and the size of the teeth, the damage to the piezoelectric film can be avoided while the data acquisition accuracy is improved, and the service life of the equipment is prolonged.
Drawings
Fig. 1 is a schematic perspective view of an undisturbed human body physiological signal collection belt according to the present invention.
Fig. 2 is an exploded view of the structure of the undisturbed human body physiological signal acquisition band in the invention.
Fig. 3 is a partial schematic view of a bottom plate assembly in example 1 of the present invention.
Fig. 4 is a partial schematic view of an upper sheet assembly in embodiment 1 of the present invention.
Fig. 5 is a cross-sectional view of the invention with trapezoidal teeth.
Fig. 6 is a cross-sectional view of the inventive tooth when the tooth is hemispherical.
Fig. 7 is a schematic cross-sectional view of a tooth of the present invention when the tooth is triangular.
Fig. 8 is a schematic cross-sectional view of a square tooth according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying 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 obtained by a person skilled in the art without making any inventive step are within the scope of the present invention.
Example 1: an undisturbed human body physiological signal acquisition belt.
Referring to fig. 1 to 5, an undisturbed human physiological signal acquisition band comprises: the piezoelectric film is clamped between the lower piece assembly 1 and the upper piece assembly 2, the lower piece assembly 1 and the upper piece assembly 2 are made of silica gel materials with different soft and hard degrees, the lower piece assembly 1 is softer than the upper piece assembly 2, a groove 13 is formed in the edge of the lower piece assembly 1, a protrusion 21 is arranged at the edge of the upper piece assembly 2 corresponding to the lower piece assembly, glue is placed in the groove 13, the protrusion 21 and the groove 13 are bonded through the glue, a 0.2cm gap is reserved at the bottom end, matched with the protrusion 21, of the groove 13 and the protrusion 21 for containing the glue, a signal output base 4 is arranged on one end head of the lower piece assembly 1, a signal outgoing line 31 is arranged on one end head of the piezoelectric film 3, the signal outgoing line 31 is connected with the signal output base 4, the signal outgoing line 31 of the piezoelectric film 3 is made of silica gel wires, and the silica gel line adopts S type to walk the line, lower wafer module 1 and 2 internal surfaces of upper wafer all are provided with tooth 11 of equidistance interval distribution side by side, and tooth 11 that sets up on the internal surface of lower wafer module 1 and tooth 11 that sets up on the internal surface of upper wafer module 2 stagger the distribution, all are provided with reference column 12 on two tip before, after the internal surface of lower wafer module 1, are provided with the locating hole 32 corresponding with reference column 12 on two tip before, after piezoelectric film 3, locating hole 32 is the slot hole that length is 3mm, and piezoelectric film 3 passes through the cooperation between reference column 12 and the locating hole 32 and can move fixedly between lower wafer module 1 and upper wafer module 2, and the cross sectional shape of tooth 11 designs into isosceles trapezoid, and the tooth width an of isosceles trapezoid tooth is 0.8mm, and tooth height h is 0.8mm, and the distance d between the two adjacent teeth is 6 mm.
Example 2: an undisturbed human body physiological signal acquisition belt.
Referring to fig. 1 and 2, teeth 11 are formed on the inner surface of the lower blade assembly 1, and the inner surface of the upper blade assembly 2 is smooth, and the remaining features are the same as those of embodiment 1.
Example 3: an undisturbed human body physiological signal acquisition belt.
Referring to fig. 1 and 2, the lower panel assembly 1 has a smooth inner surface, and the upper panel assembly 2 has teeth 11 on the inner surface, and the remaining features are the same as those of embodiment 1.
Example 4: an undisturbed human body physiological signal acquisition belt.
Referring to fig. 1 and 6, the cross-sectional shape of the tooth 11 is designed to be a semicircle, as shown in fig. 6, and the radius of the semicircle is 0.8mm, and the remaining features are the same as those of embodiment 1.
Example 5: an undisturbed human body physiological signal acquisition belt.
Referring to fig. 1 and 7, the cross-sectional shape of the tooth 11 is designed to be triangular as shown in fig. 7, and the height of the triangle is 0.8mm, and the remaining features are the same as those of embodiment 1.
Example 6: an undisturbed human body physiological signal acquisition belt.
Referring to fig. 1 and 8, the cross-sectional shape of the tooth 11 is designed as a square as shown in fig. 8, and the side length of the square is 0.8mm, and the remaining features are the same as those of embodiment 1.
Comparative example 1: adopts a commercial wave-shaped physiological signal acquisition device.
Comparative example 2: the inner surfaces of the lower blade module 1 and the upper blade module 2 were both provided with smooth surfaces (not provided with teeth), and the remaining features were the same as those of embodiment 1.
Comparative example 3: the lower plate assembly 1 and the upper plate assembly 2 are connected by screws, and the rest characteristics are the same as those of the embodiment 1.
Test example I, tooth and fixing mode test
In order to verify the connection mode between the lower piece component and the upper piece component and the influence of the tooth installation position on weak signal sensitivity in information acquisition, particularly under the same condition, the signal acquisition devices in comparative example 1, comparative example 2, comparative example 3, experimental example 1, experimental example 2 and experimental example 3 are used and respectively placed in a mattress, a tester lies on the mattress, then a professional contact type testing instrument is used for measuring the pulse beating frequency (pulse beating times per minute) and the respiration rate (respiration times per minute) of the tester, the pulse beating frequency and the respiration rate measured by the testing instrument are used as standard comparison values, and the influence of the tooth installation position and the tooth installation position on data acquisition accuracy in information acquisition is detected, wherein the specific result of the experiment is as follows:
TABLE 1
In the experiment, the accuracy of data acquisition is evaluated by using the variance, the greater the variance is, the worse the stability of data acquisition is, and the specific variance calculation formula is as follows:
σ2＝[(x1-m)2+(x2-m)2+∙∙∙+(xn-m)2]/n，
wherein sigma2Representing the variance value, m represents x1，x2∙∙∙xnAverage value of (1), x1，x2∙∙∙xnRepresenting the pulse rate difference or respiration rate difference number and n representing the number of sets of values.
From table 1, it can be calculated that the average value m of the pulse rate difference is (-4+2-1-4+3+4-5-7)/8 is-1.5 when the experiment was performed using comparative example 1, and then substituted into the variance calculation formula:
σ2＝[(-4+1.5)2+(2+1.5)2+∙∙∙+(-7+1.5)2]/8＝14.75
that is, the variance value of the pulse rate acquired by using the signal acquisition device in comparative example 1 was 14.75, and similarly, the variance value of the respiration rate acquired by using the signal acquisition device in comparative example 1 was 2.69.
TABLE 2
The variance is also calculated by a variance calculation formula: the variance value of the pulse rate acquired by the signal acquisition device in comparative example 2 was 36.11, and the variance value of the respiratory rate acquired by the signal acquisition device in comparative example 2 was 7.11.
TABLE 3
The variance is also calculated by a variance calculation formula: the variance value of the pulse rate acquired by the signal acquisition device in comparative example 3 was 3.61, and the variance value of the respiratory rate acquired by the signal acquisition device in comparative example 3 was 1.11.
TABLE 4
The variance is also calculated by a variance calculation formula: the variance value of the pulse rate acquired by the signal acquisition device in experimental example 1 was 0.5, and the variance value of the respiratory rate acquired by the signal acquisition device in experimental example 1 was 0.36.
TABLE 5
The variance is also calculated by a variance calculation formula: the variance value of the pulse rate acquired by the signal acquisition device in experimental example 2 was 1.5, and the variance value of the respiratory rate acquired by the signal acquisition device in experimental example 2 was 1.
TABLE 6
The variance is also calculated by a variance calculation formula: the variance value of the pulse rate acquired by the signal acquisition device in experimental example 3 was 0.86, and the variance value of the respiratory rate acquired by the signal acquisition device in experimental example 3 was 0.61.
Comparing the data in table 1 and table 2, it can be found that the variance value of the pulse rate and the variance value of the respiratory rate in table 1 are both smaller than those in table 2, i.e. if the inner surfaces of the lower sheet assembly and the upper sheet assembly in the signal acquisition zone are both set to be smooth (no teeth are set), the data acquisition accuracy of both the pulse rate and the respiratory rate is worse than that of the commercial wavy physiological signal acquisition device, which reflects the importance of the teeth on the data acquisition accuracy from the side.
Comparing the data in tables 3 and 4, it can be seen that the data stability in example 1 is higher than that in comparative example 3, whether the pulse rate data or the respiratory rate data are acquired, that is, the data acquisition stability in example 1 bonded by glue is higher than that in comparative example 3 fixed by screws, which also verifies from the side that the metal can have adverse effect on the acquisition and transformation of the micro-electrical signal and can affect the accuracy of the data acquisition.
Then, by comparing table 1 and table 4, it can be found that the pulse rate and the respiratory rate acquired by the signal acquisition band in experimental example 1 are much higher in accuracy than those of the commercial waveform physiological signal acquisition devices, and compared with the standard values, the maximum difference is only 1, and more times of realization result in 0 error, while the maximum difference of the commercial waveform physiological signal acquisition devices reaches-7. Finally, comparing the data in the following tables 1, 2, 4, 5 and 6, it can be found that, at least one of the lower plate assembly and the upper plate assembly of the signal acquisition belt needs to be provided with teeth on the inner surface of the assembly contacting the piezoelectric film, otherwise, the data acquisition effect is poor, and the possible reason is that if the inner surfaces are smoothly arranged, the upper plate assembly or the lower plate assembly of the signal acquisition belt needs to be greatly deformed to contact the piezoelectric film, so that the micro-vibration sensing is insensitive, and after the teeth are arranged, the teeth at the corresponding positions can be contacted with the piezoelectric film only by the micro-fluctuation of the upper plate assembly or the lower plate assembly, so that the sensitivity to the micro-vibration is improved. In addition, comparing the data in tables 1, 4, 5 and 6, it can be found that the mounting position of the teeth has a certain influence on the accuracy of data acquisition, the accuracy of data acquisition is the worst when the teeth are separately arranged on the lower plate component, and the accuracy of data acquisition when the teeth are separately arranged on the upper plate component is better than that when the teeth are separately arranged on the lower plate component, and the optimal condition is that: the inner surfaces of the lower piece assembly and the upper piece assembly are respectively provided with teeth which are distributed side by side at equal intervals, the teeth arranged on the inner surface of the lower piece assembly and the teeth arranged on the inner surface of the upper piece assembly are distributed in a staggered mode, and the accuracy rate of data acquisition is the highest (the variance at the moment is the smallest).
Test example two, tooth shape test
In order to verify the influence of the tooth shape on the sensitivity of weak signals in information acquisition, particularly under the same conditions, the signal acquisition devices in experimental example 1, experimental example 4, experimental example 5 and experimental example 6 are used and respectively placed in a mattress, a tester lies on the mattress, then a professional contact type testing instrument is used for measuring the pulse beating frequency (pulse beating times per minute) and the respiratory rate (breathing times per minute) of the tester, the pulse beating frequency and the respiratory rate measured by the testing instrument are used as standard comparison values, the influence of the tooth shape on the data acquisition accuracy in the information acquisition is detected, and the specific result of the experiment is as follows:
TABLE 7
The variance calculation formula is used for calculating: the variance value of the pulse rate acquired by the signal acquisition device in experimental example 4 was 1.43, and the variance value of the respiratory rate acquired by the signal acquisition device in experimental example 4 was 1.23.
TABLE 8
The variance calculation formula is used for calculating: the variance value of the pulse rate acquired by the signal acquisition device in experimental example 5 was 0.36, and the variance value of the respiratory rate acquired by the signal acquisition device in experimental example 5 was 0.36.
TABLE 9
The variance calculation formula is used for calculating: the variance value of the pulse rate acquired by the signal acquisition device in experimental example 6 was 0.86, and the variance value of the respiratory rate acquired by the signal acquisition device in experimental example 6 was 0.86.
As can be seen by comparing the data in tables 4, 7, 8 and 9, when the teeth are designed to be triangular, the accuracy of data acquisition is highest, when the teeth are designed to be trapezoidal, the second time, when the teeth are designed to be square, and the worst when the teeth are designed to be semicircular. The reason for this is probably that the sensitivity to fluctuations is higher as the area of contact of the teeth with the piezoelectric film is smaller, and when the cross section of the teeth is designed to be triangular, the teeth are actually in line with the piezoelectric film at the time of fluctuations in pressure; when the cross section of the teeth is designed to be trapezoidal, the contact between the teeth and the piezoelectric film is actually a rectangle with a small area during pressure fluctuation; when the cross section of the teeth is designed to be square, the teeth are actually in a rectangle with a larger area when being contacted with the piezoelectric film during pressure fluctuation; when the cross section of the tooth is designed to be hemispherical, a larger contact area is required to make the tooth contact with the piezoelectric film, thereby generating a pressure-touch signal. However, in the actual experimental process, it is found that if the cross section of the tooth is designed to be triangular, the piezoelectric film is easily damaged (the contact pressure is too concentrated) as the number of times of contact between the tooth and the piezoelectric film increases, so that the piezoelectric film in the later period is insensitive to the pressure signal, and the service life of the signal acquisition device is affected. Therefore, the teeth are designed to be trapezoidal, so that the accuracy of signal acquisition can be ensured, and the service life of the acquisition device can be ensured.
Test example three, trapezoidal tooth size test
In order to verify the influence of the size of an isosceles trapezoid tooth on the sensitivity of a weak signal in information acquisition, particularly under the same condition, the tooth width a, the tooth height b and the tooth distance d of the tooth are changed to acquire data, and the influence of the tooth width a, the tooth height b and the tooth distance d on the data acquisition accuracy is tested.
Experiment I, influence of tooth width a on weak signal sensitivity in information acquisition
An experimental method, using the signal acquisition device in embodiment 1, without changing other characteristics, changes the tooth width a, where the tooth width a is set to 0.1mm, 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1mm, 1.5mm, 2mm, 2.5mm, and 3mm, respectively, places the signal acquisition devices using different tooth widths a under a micro-vibration device with a fixed frequency of 70 times/minute, and takes one minute as a period, and each group of signal acquisition devices using different tooth widths a acquires 100 groups of data (i.e. 100 minutes), and compares the accuracy of data acquisition by the signal acquisition devices using different tooth widths a, for example: when the tooth width a is 0.2mm, the signal acquisition device is placed below the micro-vibration device with the fixed frequency of 70 times/minute, one minute is taken as a period, if 96 groups of 100 groups of data acquired at the time are displayed as 70 times/minute, the tooth width a is 0.2mm, the accuracy rate of data acquisition is 96%, and if the data displayed by the signal acquisition device is not 70 times/minute, the data acquisition is judged to be wrong, and the experimental results are shown in table 10:
watch 10
As can be seen from table 10, as the tooth width a increases, the accuracy of data acquisition deteriorates, and as can be seen from the above data, the tooth width a should not be greater than 2mm, otherwise the accuracy of data acquisition may be less than 90%, and in addition, considering that the smaller the tooth width a is, the easier it is to damage the piezoelectric thin film (the contact pressure is too concentrated), which may affect the service life of the piezoelectric thin film, when the tooth width a is 0.8mm, the accuracy of signal acquisition may be ensured, and the longer service life of the piezoelectric thin film may also be ensured.
Experiment II, influence of tooth height h on weak signal sensitivity in information acquisition
An experimental method, using the signal acquisition device in embodiment 1, without changing other characteristics, changes the tooth height h, which is set to 0.1mm, 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1mm, 1.5mm, 2mm, 2.5mm, and 3mm, respectively, places the signal acquisition devices using different tooth heights h under a micro-vibration device with a fixed frequency of 70 times/min, and takes one minute as a period, and acquires 100 sets of data (i.e. 100 minutes) from each set of different tooth height h signal acquisition devices, and compares the accuracy of acquiring data from different tooth height h signal acquisition devices, for example: when the tooth height h is 0.8mm, the signal acquisition device is placed below the micro-vibration device with the fixed frequency of 70 times/minute, one minute is taken as a period, if 99 groups of 100 groups of data acquired at the time are displayed for 70 times/minute, the tooth height h is 0.8mm, the accuracy of data acquisition is 99%, and if the data displayed by the signal acquisition device is not 70 times/minute, the data acquisition is judged to be wrong, and the experimental result is shown in table 11:
TABLE 11
| Tooth height h/mm | Rate of accuracy/%) |
| 0.1 | 81 |
| 0.2 | 85 |
| 0.4 | 90 |
| 0.6 | 94 |
| 0.8 | 99 |
| 1 | 99 |
| 1.5 | 99 |
| 2 | 97 |
| 2.5 | 97 |
| 3 | 95 |
As can be seen from table 11, as the tooth height h increases, the accuracy of data acquisition becomes better and worse, when the tooth height h is between 0.6mm and 2mm, the accuracy of data acquisition is higher, the tooth height h especially cannot be lower than 0.4mm, otherwise the accuracy of data acquisition is sharply reduced, and in addition, it is found in the actual assembly process that the tooth height h should not be too high, otherwise, the piezoelectric film is inconvenient to mount and is easy to slide, and when the tooth height h is selected to be 0.8mm, the effect is the best.
Experiment III, influence of the tooth space d on the sensitivity of weak signals in information acquisition
Experimental method, using the signal acquisition device in example 1, other characteristics are unchanged, and the tooth spacing d is changed, and the tooth spacing d is set to 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 12mm, 15mm respectively, and the signal acquisition devices with different tooth heights h are placed under a micro-vibration device with a fixed frequency of 70 times/minute, and each group of the signal acquisition devices with different tooth spacing d acquires 100 groups of data (i.e. 100 minutes) with one minute as a period, and the accuracy of data acquisition by the signal acquisition devices with different tooth spacing d is compared, for example: when the tooth space d is 4mm, the signal acquisition device is placed below the micro-vibration device with a fixed frequency of 70 times/minute, one minute is taken as a period, if 94 groups of 100 data acquired at the time are displayed as 70 times/minute, the accuracy of data acquisition is 94% when the tooth space d is 4mm, and if the data displayed by the signal acquisition device is not 70 times/minute, the data acquisition is judged to be wrong, and the experimental results are shown in table 12:
TABLE 12
| Tooth spacing d/mm | Rate of accuracy/%) |
| 1 | 90 |
| 2 | 90 |
| 3 | 91 |
| 4 | 94 |
| 5 | 97 |
| 6 | 99 |
| 7 | 98 |
| 8 | 97 |
| 9 | 95 |
| 10 | 92 |
| 12 | 88 |
| 15 | 79 |
As can be seen from table 12, as the tooth distance d increases, the accuracy of data acquisition becomes better and then worse, when the tooth distance d is between 4mm and 10mm, the accuracy of data acquisition is higher, and particularly, the tooth distance d cannot be larger than 12mm, otherwise, the accuracy of data acquisition is rapidly reduced, the larger the tooth distance is, the smoother the inner surfaces of the upper plate assembly and the lower plate assembly are, when pressure fluctuates, the smaller the chance of contact between the internal teeth and the piezoelectric film per unit area is, thereby causing insensitivity to partial weak pressure fluctuation, but if the tooth distance is too small, the pressure contact signals are too dense, which may cause the misjudgment of the piezoelectric film signals, and also cause the incorrect signal acquisition. In summary, the tooth distance d should not be too large or too small, and experiments prove that the effect is best when the tooth distance d is 6 mm. And when: when the tooth width a is 0.8mm, the tooth height h is 0.8mm and the tooth spacing d is 6mm, the signal acquisition accuracy is the highest, and the accuracy is as high as 99%.
The above description is only for the preferred embodiment of the present invention, but the present invention should not be limited to the embodiment and the disclosure of the drawings, and therefore, all equivalent or modifications that do not depart from the spirit of the present invention are intended to fall within the scope of the present invention.
Claims (1)
1. An undisturbed human physiological signal acquisition band comprising: lower piece subassembly, last piece subassembly and piezoelectric film, the piezoelectric film centre gripping is between lower piece subassembly and last piece subassembly, be provided with signal output seat on the tip of lower piece subassembly, be provided with signal outgoing line on the tip of piezoelectric film, signal outgoing line is connected its characterized in that with signal output seat: the edge of the lower piece component is provided with a groove, the edge of the upper piece component corresponding to the groove is provided with a protrusion, or the edge of the lower piece component is provided with a protrusion, the edge of the upper piece component corresponding to the protrusion is provided with a groove, glue is placed in the groove, a gap of 0.2-0.3 cm is reserved at the bottom end of the groove matched with the protrusion for containing the glue, the protrusion and the groove are bonded through the glue, teeth which are distributed side by side at equal intervals are arranged on the inner surface of at least one of the lower piece component and the upper piece component, which is in contact with the piezoelectric film, the cross section of each tooth is in an isosceles trapezoid shape, the tooth width a of each isosceles trapezoid tooth is 0.8mm, the tooth height h is 0.8mm, and the distance d between every two adjacent teeth is 6; the inner surfaces of the lower sheet assembly and the upper sheet assembly are respectively provided with teeth which are distributed side by side at equal intervals, and the teeth arranged on the inner surface of the lower sheet assembly and the teeth arranged on the inner surface of the upper sheet assembly are distributed in a staggered manner; the signal outgoing line of the piezoelectric film adopts a silica gel line, and the silica gel line adopts an S-shaped wiring; positioning columns are arranged on the front end and the rear end of the inner surface of the lower sheet assembly, positioning holes corresponding to the positioning columns are arranged on the front end and the rear end of the piezoelectric film, the positioning holes are long holes with the length of 2-4mm, and the piezoelectric film can be movably fixed between the lower sheet assembly and the upper sheet assembly through the matching between the positioning columns and the positioning holes; the lower piece component and the upper piece component are made of silica gel materials with different hardness degrees, and the lower piece component is softer than the upper piece component.
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| CN104013392A (en) * | 2014-05-09 | 2014-09-03 | 杨松 | Human body physiological signal collecting device and system |
| CN106073705A (en) * | 2016-06-01 | 2016-11-09 | 深圳市格兰莫尔寝室用品有限公司 | Piezo-electric device and sleep monitoring device |
| CN205913328U (en) * | 2016-05-23 | 2017-02-01 | 深圳眠虫科技有限公司 | Sleep monitor and physiological parameter monitor pillow |
| CN106943129A (en) * | 2017-03-10 | 2017-07-14 | 深圳市赛亿科技开发有限公司 | Wearable heart rate and respiration monitoring device, method and its intelligent jacket |
| CN208492076U (en) * | 2017-09-27 | 2019-02-15 | 广州中科新知科技有限公司 | A kind of unperturbed formula physiology signal acquisition band |
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|---|---|---|---|---|
| CN104013392A (en) * | 2014-05-09 | 2014-09-03 | 杨松 | Human body physiological signal collecting device and system |
| CN205913328U (en) * | 2016-05-23 | 2017-02-01 | 深圳眠虫科技有限公司 | Sleep monitor and physiological parameter monitor pillow |
| CN106073705A (en) * | 2016-06-01 | 2016-11-09 | 深圳市格兰莫尔寝室用品有限公司 | Piezo-electric device and sleep monitoring device |
| CN106943129A (en) * | 2017-03-10 | 2017-07-14 | 深圳市赛亿科技开发有限公司 | Wearable heart rate and respiration monitoring device, method and its intelligent jacket |
| CN208492076U (en) * | 2017-09-27 | 2019-02-15 | 广州中科新知科技有限公司 | A kind of unperturbed formula physiology signal acquisition band |
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