A kind of human sebaceous's thickness measurement equipment of pressure control ultrasonic waveTechnical field
The present invention relates to a kind of instruments using ultrasonic measurement human body subcutaneous fat thickness, belong to physiology signal surveyAmount field.
Background technique
Obesity is the common of the chronic diseases such as cardiovascular disease, type-II diabetes, hypertension, hyperlipemia, malignant tumourRisk factor.The fat continuous accumulation for taking the form of human body body fat, wherein subcutaneous fat accounts for the 40-of the total fat of body60%, thus detect subcutaneous fat thickness and can reflect the Fat Distribution of body parts.
It clinically detects, Magnetic resonance imaging (MRI), computed tomography (CT), Dual energy X ray absorptiometry(DEXA), ultrasonic imaging technique can more accurately measure adipose tissue thickness, but equipment volume is larger, expensive.BehaviourIt needs as personnel by professional training.CT and DEXA method is also by the harm of ray.
Skin wrinkle meter is a kind of cheap, noninvasively estimating subcutaneous fat thickness method.But it is difficult to when being measured with Skin wrinkle meter reallyThe interface of fixed fat and muscle, and have feeling of pain.Bio-electrical impedance measuring method is influenced more apparent by internal water content.CloselyInfrared light mensuration is simple, easy to operate, but since near infrared light penetration capacity is limited, for its measurement of thicker subcutaneous fatAccuracy is to be improved.
Therefore, it attempts to measure human body subcutaneous fat thickness using portable ultrasonic device.Existing technical literature patent is a kind ofUsing the instrument of ultrasonic measurement human body subcutaneous fat thickness, pulse signal can be generated by single-chip microcontroller and single pulse excitation is superSonic probe work and timing stop timing by capturing echo signal triggering and interrupting, and calculate human body subcutaneous fat thickness.ButIt is that, when operating instrument, ultrasonic probe directly affects measurement result to the pressure at tested position and with the angle at tested positionAccuracy and reliability, have strict requirements to the measurement gimmick of operator.
Summary of the invention
In order to overcome ultrasonic probe to the pressure at tested position and with the angle at tested position to measurement accuracy and reliableProperty influence, the present invention provides human sebaceous's thickness measurement equipment of pressure control ultrasonic wave, and apparatus measures accuracy is high, can be withConvenient, fast, non-invasive measurement body any part subcutaneous fat thickness.
A kind of human sebaceous's thickness measurement equipment of pressure control ultrasonic wave, which is characterized in that including pressure sensor, ultrasoundProbe and host, host inside include operational amplifier circuit, single-chip microcontroller, high pressure activation circuit, amplifying circuit；Pressure sensor, ultrasoundProbe is located at outside host, and pressure sensor is connect with operational amplifier circuit, and operational amplifier circuit is connect with the analog-digital converter in single-chip microcontroller,Single-chip microcontroller is also connect with high pressure activation circuit, amplifying circuit respectively simultaneously, while high pressure activation circuit, amplifying circuit connect and surpassSonic probe connection；
Pressure sensor and ultrasonic probe act on the same detected part of human skin surface, pressure sensor measurement simultaneouslyUltrasonic probe is applied to the pressure that human body is tested position, is sent in the analog-digital converter of single-chip microcontroller by operational amplifier circuit, single-chip microcontrollerJudge to pass through high pressure activation circuit activation ultrasonic probe sending ultrasonic wave after pressure reaches threshold value, ultrasonic wave passes through body fat groupEcho signal is returned to after knitting, echo signal returns to single-chip microcontroller after amplifying by amplifying circuit, single-chip microcontroller calculates ultrasonic wave in human bodyThe average time of adipose tissue walking, the subcutaneous rouge of human body is obtained by being multiplied with ultrasonic wave in the spread speed of human fatty tissueThe thickness of fat.
Pressure sensor, ultrasonic probe are cylindrical structure, and pressure sensor, ultrasonic probe are axial parallel and hang down simultaneouslyIt directly is fixed on host outer surface, and the top of pressure sensor cylindrical body and ultrasonic probe cylindrical body is contour i.e. coplanar.
Pressure sensor, ultrasonic probe are independent, and distance of center circle Dr between the two, preferably 60mm≤Dr≤40mm.
Pressure sensor and ultrasonic probe act on the same detected part of human skin surface simultaneously, because of pressure sensorIt is all cylindrical body with ultrasonic probe and mutually indepedent, so ultrasonic probe and the tested surface of human contact are perpendicular in measurement.Single-chip microcontroller sets the pressure threshold of measurement, and when pressure is in threshold range, excitation ultrasonic probe issues ultrasonic wave, calculates superThe average time that sound wave is walked in subcutis calculates human body subcutaneous fat thickness and continues to show in display module, whenPressure does not measure and is shown in the data in threshold range outside threshold range, and when pressure is 0, display module is shown as 0.
The setting condition of threshold value can be set as needed, and generally be obtained by experiment, that is, is applied to human body and is tested positionPressure does not influence the position subcutaneus adipose tissue deformation, and then obtains being converted into corresponding analog-digital converter under the pressure limitSignal.
The beneficial effect of the invention patent is that any operator can accurately measure the thickness of human body subcutaneous fat.
Detailed description of the invention
Fig. 1 is composition block diagram of the present invention
Fig. 2 is software flow pattern of the invention
Fig. 3 is Design Plans of the invention, and 1 is ultrasonic probe, and 2 be pressure sensor, and 3 be host.
Fig. 4 is instrumentation plan of the invention.
Specific embodiment
Below with reference to embodiment, the present invention will be further described, but the present invention is not limited to following embodiments.
Embodiment 1
In Fig. 1, instrument includes host, pressure sensor and ultrasonic probe.Host includes operational amplifier circuit, single-chip microcontroller, heightPress exciting circuit, amplifying circuit, display module and power module.The connection of the operational amplifier circuit of pressure sensor and host, ultrasound are visitedHead is connect with the high pressure activation circuit and amplifying circuit of host.Pressure sensor and ultrasonic probe act on human skin table simultaneouslyThe power for being applied to the tested position of human body is converted to electric signal by face, pressure sensor, and electric signal passes through operational amplifier circuit and amplifies entranceIn the analog-digital converter of single-chip microcontroller, single-chip microcontroller emits ultrasonic wave by high pressure activation circuit activation ultrasonic probe, and ultrasonic wave passes throughEcho signal is returned to after human body subcutaneus adipose tissue, echo signal enters single-chip microcontroller by amplifying circuit, and single-chip microcontroller calculates ultrasoundWave calculates human body subcutaneous fat thickness by formula and shows in display module in the average time of the walking of human fatty tissueShow, it is whole to be powered by power module.
As shown in Figure 2, when single-chip microcontroller judges pressure signal Urf=0, instrument, which empties, is shown as 0；Single-chip microcontroller judges pressureWithin the scope of condition threshold of the value in setting, i.e. when th1≤Urf≤th2 (i.e. the corresponding range of signal of pressure), instrument excitation is superSonic probe issues ultrasonic wave and calculates human body subcutaneous fat thickness:Wherein, D indicates subcutaneous fat depthDegree, Δ TiIt indicates to return to the time required for echo signal after ultrasonic wave passes through human body subcutaneous fat, v indicates ultrasonic wave subcutaneousThe spread speed of fat, N≤4 are pendulous frequency, and measurement result is continuously display；Single-chip microcontroller judges that pressure value is in the item of settingOutside part threshold range, the numerical value for the human body subcutaneous fat thickness that display instrument measures in threshold range.The setting item of threshold valuePart range th1 and th2 show that experimental standard, that is, pressure does not influence the deformation range of subcutaneus adipose tissue deformation or generation by testingVery little.
An embodiment therein: v=1500m/s, th1=2000, th2=2200.
In the embodiment shown in fig. 3, the circle of ultrasonic probe (1) diameter D2=30mm, high H2≤10mm, working frequency 2MHzCylindricality ultrasonic Doppler transducer, pressure sensor (2) diameter D1=10mm, high H1≤10mm, range are 0~500N, and pressure passesSensor, ultrasonic probe are vertical with the approximately the same plane of host, and distance of center circle 60mm≤Dr of pressure sensor and ultrasonic probe≤40mm, display module of the human body subcutaneous fat thickness on host (3) surface measured by instrument are shown.
An embodiment therein: H1=10mm, H1=10mm, Dr=40mm.
In the embodiment shown in fig. 4, pressure sensor and ultrasonic probe act on human skin surface simultaneously.