CN2376863Y - Warning device for measuring Korotkoff's sounds of blood pressure - Google Patents

Abstract

The utility model relates to a warning device for measuring Korotkoff's sound blood pressure used for measuring human body blood pressure. A reading aid type hematomanometer (meter) is composed of the utility model and a desktop mercury manometer or a mechanical spring pressure meter. The utility model comprises a detector 1, a filter 2, an amplifier 3, resistance dividers 4, 9, an integrated package 5, a detector diode 6, a holding capacitor 7, a follower 8, a comparator 10, an analog switch 11, a repeatable triggering monostable trigger 12, LCDs 13, 17, a differential capacitor 14, a differential resistor 15, a monostable trigger 16, an audio oscillator 18, a circuit of the utility model composed of a detector, a control box online 28, a control box 29, a status indicator 30, and a printed circuit board 31. The utility model has the advantages of stable performance, high sensitivity and accurate indication.

Description

Measure blood pressure Ke Shi sound alarming device

This utility model method and a kind of used measurement blood pressure Ke Shi sound alarming device of human blood-pressure of measuring.This device helps with desk-top mercury gauge or mechanical spring Pressure gauge composition and reads formula sphygomanometer (table).

At present, human blood-pressure is measured generally with desk model sphygmomanometer or portable mechanism sphygomanometers.It is with an arm cover that auscultation is measured blood pressure, ties up on upper arm artery, earlier the arm cover is inflated to that to be higher than systolic pressure many, presses off upper arm artery, blocks whole blood flow, the arm cover is slowly exitted again.Stethoscopic chest piece places on the brachial artery, writes down and hears in the earplug that the arm cover pressure of Ke Shi sound (first phase snap sound) when occurring is systolic pressure clearly, second phase noise, after the third phase flapping sound, the Ke Shi sound is the strongest, and the fourth phase seals sound and occurs, and the pressure of arm band is diastolic pressure.Ke Shi sound amplitude is decreased to disappearance in the fourth phase.What have then is to utilize pick off, amplifier to take out the Ke Shi tone signal to compare with the reference voltage of determining, detects the appearing and subsiding of Ke Shi sound constantly, reads systolic pressure and diastolic pressure.Its shortcoming is:

1, the amplitude-frequency characteristic of human individual Ke Shi tone signal is widely different, and reference voltage is set on the low side, and before occurring for the strong people Ke Shi sound of pulse, the long-range vascular pulsation after the end is wrong easily to be shown.Systolic pressure is higher, and diastolic pressure is on the low side.Reference voltage is set too high, and then lagging behind appears in the Ke Shi sound, disappears in advance, and the systolic pressure of measuring is on the low side, and diastolic pressure is higher.Error size varies with each individual, and credibility is not high, poor accuracy.

2, Ke Shi sound extinction time is difficult to judge.

This utility model technical characterictic is: adopt pick off, the Ke Shi sound signal of telecommunication that wave filter, amplifier are got is delivered to the input negative terminal of comparator; This signal delivers to simultaneously that maximum detects and holding circuit, and comparator input anode is sent in its output behind electric resistance partial pressure, the reference voltage of device as a comparison, and comparator original state output low level, the Ke Shi tone signal is exported a positive pulse once comparator occurring.The Ke Shi tone signal of third phase end is the strongest, and comparator input anode is kept the highest reference voltage.The early stage fourth phase, Ke Shi tone signal voltage was higher than the highest reference voltage, comparator output positive pulse, and the Ke Shi tone signal voltage in the later stage fourth phase is lower than the highest reference voltage, and comparator does not have pulse output.Two monostable flipflops comprise two identical circuit, and each circuit has an input, positive and negative two inputs, anode output positive pulse, negative terminal output negative pulse.The positive pulse of comparator output is delivered to the input of two monostable flipflops simultaneously, the output pulse width of one of them trigger is 0.1 second, its anode output makes audio oscillator work, light emitting diode is lighted in negative terminal output, with uttering a word, the light caution, the output pulse width of another monostable flipflop is 5 seconds, greater than the Ke Shi sound cycle, its output pulse width is pressed onto diastolic pressure for shrinking, time adds 5 seconds, negative pulse of negative terminal output of this monostable flipflop, and rising edge makes the analog switch conducting, allow and keep capacitor discharge to original state, the positive pulse of anode output, illuminating state indication diode, status indicator lamp extinguishes, expression detects and holding circuit is in waiting state, can exit and carry out blood pressure measurement.

This utility model compared with prior art has the following advantages:

1, highly sensitive pick off and linear amplifier guarantee accurately to measure systolic pressure.

2, maximum detection and holding circuit provide the reference voltage that varies with each individual for comparison circuit, can accurately record diastolic pressure.

3, during the venting of arm band invalid caution sound does not appear.

Fig. 1 is this utility model block diagram.

Fig. 2 is that this utility model is overlooked external form figure.

Fig. 3 is this utility model side-looking external form figure.

Fig. 4 is this utility model pick off outline drawing.

Fig. 5 is that helping of this utility model formation read formula blood pressure machine sketch map.

Wherein, pick off 1, wave filter 2, IC2-1 amplifier 3, resitstance voltage divider 4, IC2-2 integrated package 5, D1 detector diode 6, C1 keeps electric capacity 7, IC2-3 follower 8, resitstance voltage divider 9, IC2-4 comparator 10, BE1 analog switch 11, but IC3-1 repeated trigger monostable flipflop 12, D2 light emitting diode 13, C2 divides the emblem electric capacity 14, R5 emblem sub-resistance 15, IC3-2 monostable flipflop 16, D3 light emitting diode 17, audio oscillator 18, mercury column 19, help and read formula sphygomanometer loam cake 20, hydrargyrum bottle 21, sit 22 at the bottom of the sphygomanometer, place pick off 23 in the arm band, arm band 24, rubber trachea 25, air valve 26, inflatable ball 27, pick off and control box on line 28, control box 29, status indicator lamp 30, printed wiring board 31.

Particular content of the present utility model is provided by following examples and accompanying drawing thereof.

This utility model as shown in Figure 5, arm band 24 is tied up in the exposed upper arm of human body, connect pick off 23 and make it aim at brachial artery, screw air valve 26, then pinch inflatable ball 27, it is many to make mercury column 19 be higher than systolic pressure, at this moment status indicator lamp 30, after going out, light unscrews air valve 26 slightly, slowly venting, and the mercury column 19 when hearing first caution sound highly is systolic pressure, status indicator lamp 30 is simultaneously luminous, and the height of hearing the mercury column 19 of last caution sound correspondence is a diastolic pressure.Status indicator lamp 30 light go out after 5 seconds.

This utility model is measured the blood pressure venting stage as shown in Figure 1, and the Ke Shi tone signal that pick off 1 is gathered is through wave filter 2, and amplifier 3 amplifies 34db, is sent to the input of comparator 10, simultaneously this signal is delivered to the input anode of IC2-2 integrated package 5.IC2-2 integrated package 5, D1 detector diode 6, C1 keep electric capacity 7 and tracker 8 to connect into maximum detection and holding circuit, and its output provides the reference voltage of variation for the input negative terminal of IC2-4 comparator 10 through resitstance voltage divider 9.The initial value of this reference voltage is set by resitstance voltage divider 4, kept for 5 seconds constant after obtaining maximum, the Ke Shi tone signal that signal level is higher than reference voltage occurs, positive pulse of IC2-4 comparator 10 outputs, Ke Shi tone signal level during systolic pressure and the diastolic pressure all is higher than reference voltage, and IC2-4 comparator 10 is all exported positive pulse.The input of IC3-2 integrated package 16 is subjected to the positive pulse effect of IC2-4 comparator 10 outputs, and output plus terminal makes audio oscillator 18 work, sends the interruption buzzer, and the output negative terminal is lighted D3 light emitting diode 17, warns as light.But the input of IC3-1 repeated trigger monostable flipflop 12 is subjected to the positive pulse effect of IC2-4 comparator 10 outputs, and output plus terminal produces positive pulse, lights D2 light emitting diode 13, and just extinguish for 5 seconds behind diastolic pressure, is the state indication.The pulse that its output negative terminal produces same width, guarantee that BEI analog switch 11 disconnects during measuring, rising edge when negative pulse finishes produces the forward burst pulse through C2 differential capacitance 14 and R5 differential resistance 15, make 11 conductings of BEI analog switch, C1 keeps electric capacity 7 discharges, returns to the original state of resitstance voltage divider 4.

Claims (1)

1. A kind of pick off 1 that contains, wave filter 2, amplifier 3, resitstance voltage divider 4,9, integrated package 5, detector diode 6, keep electric capacity 7, follower 8, comparator 10, analog switch 11, but repeated trigger monostable flipflop 12, light emitting diode 13,17, differential capacitance 14, differential resistance 15, monostable flipflop 16, audio oscillator 18, pick off and control box on line 28, control box 29, status indicator lamp 30, printed wiring board 31 constitutes measures blood pressure Ke Shi sound alarming device, it is characterized in that pick off 1, wave filter 2, amplifier 3 is formed the collection signal of telecommunication, comparator 10, integrated package 5, detector diode 6, keep electric capacity 7, follower 8 connects into holding circuit, for receiving the signal of telecommunication output signal of telecommunication, output connecting resistance potentiometer 9, comparator 10 outputs connect 2 monostable flipflops 16, a monostable flipflop 16 connects audio oscillator 18, connect reflective diode 17, another monostable flipflop 16 connects analog switch 11, connects status indicator lamp 30.

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