RU2096986C1 - Device for measuring diastolic and systolic blood pressure - Google Patents

Abstract

FIELD: medical engineering. SUBSTANCE: device has autoregulator amplifier, integrator, threshold gate, two access-storage units, summator, two control circuits, sign-setting circuit, amplifier, pulse indication member, increment indication member, decision-making circuit, analog-to-digital converter, two numeric registers. To measure pressure value, force-measuring strain-measuring transducer like constant cross-section circular ring designed as a whole with bed and pulsating wave gage. EFFECT: simplified operation mode. 1 dwg

Description

 The invention relates to the field of medical equipment and can be used to measure diastolic and systolic blood pressure.

 Finger pressure methods and devices with which these measurements can be carried out are already known in medical technology.

 One of these methods and the device for its implementation are described in the copyright certificate [1]. The main disadvantage of the method and device is the low measurement speed.

 The second analogue is the device for localizing the location of the pulse signal from the finger, described in the copyright certificate [2]. The disadvantages of this device include the presence of spring-loaded contacts, which can cause distortions. In addition, the force on the finger before the measurement can adversely affect the measurement results.

 The prototype of the invention is a device for processing blood pressure data described in the copyright certificate [3]. This device includes a pneumatic channel control unit, a block for converting the blood supply into an electrical signal, an indication unit, a counter, a clock pulse generator, a switch, and a block for analyzing changes in the blood supply.

 The disadvantage of the prototype is the limitation on the speed of measurement. The lower it is, the more accurate the measurement.

 Therefore, the alleged invention is aimed primarily at increasing the speed of blood pressure measurements.

 The invention is illustrated in the drawing, which presents a structural diagram of the device.

The device consists of blocks:
1. DPV - pulse wave sensor
2. AGC auto-adjustable amplifier
3. INT integrator
4. PE threshold element
5 and 6 UBx1; UBx2 storage fetch device
7. CxУ1 first control circuit
8. CxO3 sign determination scheme
9. Σ adder
10. INP heart rate indicator
11. DSS decision-making scheme
12. IPR increment indicator
13. SIP power transducer
14. The amplifier
15. ADC analog-to-digital converter
16 and 17. P1, P2 digital registers
18. COM switch
19. CxУ2- second control circuit
20. IND Indication.

 The proposed device for measuring pressure is as follows.

 The finger is placed on the lodgement of the load transducer. A pressure signal is taken from the force transducer. The force transducer is structurally performed together with a tool tray and a photoplethysmographic pulse wave sensor.

 When a force transducer (SIP) acts on the finger of the hand, the amplitude of the pulse wave signal begins to change. The pulse wave signal from the pulse wave sensor (DPW) through an auto-regulating amplifier (AGC) is fed to the integrator (INT) and the threshold element (PE). The time-integrated signal is supplied to the sampling-storage devices (УBx1 or Вх2). As soon as the signal from the pulse wave sensor (DPW) reaches the threshold value, it enters the second control circuit (CX2), which opens one of the sampling-storage devices (for example, UBx1), which remembers the value of the supplied signal. When the next pulse wave signal arrives, the control circuit (CxУ2) opens another sampling-storage device (for example, УBх2).

 Next, the signals from both sampling-storage devices are fed to the adder (Σ). After the adder, the sign detection circuit (Cx03) sets the sign of the difference of the signals. If the sign is negative, i.e. If the pulse wave signal amplitude starts to decrease, then the decision-making scheme in the presence of signals from the increment indicator (IPR) and from the threshold element (PE) opens one of the digital registers (for example, P1), where the signal from the analog-to-digital converter (ADC) is entered. This signal value is taken as diastolic pressure. If the difference sign is positive, then the digital register does not open. To an analog-to-digital converter (ADC), the signal is fed through an amplifier (U) from a load transducer (SIP). With a further decrease in the amplitude of the pulse wave, the signal from the pulse wave sensor (DPW) disappears. In this case, the decision-making scheme (DSS) opens the second digital register (P2), and information from the analog-to-digital converter (ADC) is entered into it. This signal value is taken as systolic pressure. By the signal from the first control circuit (CxУ1), both pressure values through the switch (COM) are alternately displayed (IND).

 Thus, an increase in the measurement speed is achieved by the fact that instead of a pneumatic cuff, a force measuring tensometric transducer such as a circular ring of constant cross section is used, which is structurally made together with a lodgement and a pulse wave sensor. In addition, an autoregulated amplifier, an integrator, a threshold element, two sampling-storage devices, an adder, a sign determination circuit, a pulse indicator, an increment indicator, two control circuits, a decision-making circuit, an amplifier, an analog-to-digital converter, are additionally introduced into the information processing circuit; two digital registers.

 The proposed device allows measurements at a speed of the order of two measurements per minute. The device, allowing you to save the advantages of finger measurement methods, eliminates the disadvantages of the cuff method. The device is intended for mass use.

Claims (1)

 A device for measuring diastolic and systolic blood pressure, containing a pulse wave sensor, a switch, an indication unit, characterized in that a force measuring tensometric transducer of the type of a circular ring of constant cross section is introduced into it, the output of which is connected to the input of the amplifier, the output of which is connected to the inputs of analog-digital the converter and the increment indicator, the output of the analog-to-digital converter is connected to the first inputs of two digital registers, the outputs of which are connected to two I am the switch inputs, the third input of the switch is connected to the first control circuit, and the output is with the input of the display unit, the output of the increment indicator is connected to the first input of the decision circuit, the second input of which is connected to the input of the pulse indicator, the input of the second control circuit and the output of the threshold element, the third the input of the decision circuit is connected to the output of the sign determination circuit, the outputs of the decision circuit are connected to the second inputs of the digital registers, the input of the threshold element is connected to the output of the auto-adjustable amplifier For the integrator’s input, the input of the self-regulating amplifier is connected to the pulse wave sensor output, the integrator’s output is connected to the two first inputs of the first and second sampling and storage devices, the control inputs of which are connected to the outputs of the second control circuit, the outputs of the sampling and storage devices are connected to the inputs of the adder, the output of which is connected to the input of the sign determination circuit.