RU75293U1 - TELEMETRIC SYSTEM FOR MONITORING PHYSIOLOGICAL PARAMETERS - Google Patents

Abstract

The telemetry system for monitoring physiological parameters contains underwear with an electrocardiograph, a pulse oximeter located in it, the sensors of which are installed with the possibility of contacting with sensitive parts of the body of the subject, a primary signal processing unit and an information unit whose input is connected via a telecommunication channel to the output of the primary signal processing unit . The information output of the electrocardiograph is connected to the first input of the primary signal processing unit; the outputs of the pulse-meter according to photoplethysmogram, oxygen content in red blood cells and pulse rate are connected to the second, third and fourth inputs of the primary signal processing unit, respectively. To increase the monitoring information content, the system additionally contains an RS-trigger, a timer and a blood pressure calculation unit, using an electrocardiograph equipped with an R-wave marker of the electrocardiogram. The output of the R-wave marker of the electrocardiogram is connected to the R-input of the RS-trigger, the marker output of the pulse oximeter is connected to the S-input of the RS-trigger, the output of the RS-trigger is connected to the timer input, the timer output is connected to the fifth input of the primary signal processing unit and to the input of the block calculating blood pressure, and the output of the blood pressure calculating unit is connected to the sixth input of the primary signal processing unit. In underwear can be additionally placed a thermometer and / or induction plethysmograph and an accelerometer-inclinometer, the outputs of which are connected to the seventh, eighth and ninth inputs of the primary information processing unit, respectively. It is advisable to implement a telecommunication channel using Bluetooth technology. 2 stars P. f-ly, 1 Fig.

Description

The utility model relates to medical equipment designed to determine the physiological parameters of a comprehensive assessment of the state of the body during cardiac and traumatological examinations. It is most effective to use it in the field, in particular, to monitor the health status of athletes, firefighters, as well as fighters of power structures directly during special operations.

Known telemetry system for monitoring the functional state of a person, receiving, transmitting and processing parameters of an electrocardiogram. Such a system, implemented on the basis of a mobile phone, contains an electrode cardiosensor, an amplifier-converter, a call unit, a memory unit for the called subscriber, a transmitter and a GSM receiver located at the control center (US 6546232, АВВ 5/04, 1998).

The main disadvantages of this system are the low information content (they control only one physiological characteristic), the impossibility of long-term monitoring, as well as monitoring the human condition in the field.

A telemetric system for monitoring the functional state of a person is also known, which records the body temperature, pulse and blood pressure of a person and sends communication messages about the value of these parameters using a mobile phone (RU 2204887, Н04М 1/02, Н04М 1/21, 2003). A mobile phone designed for this purpose, according to the specified patent, contains a transceiver unit, a call sound indication unit, a memory unit, a microphone, a phone, a display, a keyboard, an operating mode selection unit, interface units and a power source that are connected to the controller, two sensors

pressure, two temperature sensors and a humidity detection sensor, wherein the first temperature sensor, the first pressure sensor and the humidity detection sensor are mounted directly on the surface of the mobile radiotelephone housing, and the second temperature sensor and the second pressure sensor are installed in the recess of the mobile radiotelephone body with the possibility of contact the subscriber’s finger, and all sensors are connected to the controller through the corresponding interface blocks.

This design also does not allow long-term monitoring of the human condition. In addition, during the removal of blood pressure in order to reduce artifacts, a person should be motionless, as a result of which this design is unacceptable in the field.

An attempt to ensure a person’s performance during the monitoring of his functional state using a telemetry system based on a cardiorhythmograph, additionally equipped with a source of ultra-wideband electromagnetic pulses of remote irradiation of a human body area of 0.2-1.0 nsec, a repetition rate of 0.05-30.0 MHz and average the energy flux density in the irradiated part of the human body is not more than 0.2 μW / cm, the reflected signal receiver and the modulator component of the pulse repetition rate, due to cardiac activity (RU 2258455, АВВ 5/02, 5/05, 5/0452, 2005) not only does not solve this problem, but also significantly complicates the design by introducing named nodes.

In the design of telemetry systems for monitoring physiological parameters, there is a tendency to embed their sensitive elements, together with the nodes for receiving and processing primary information connected to them in underwear (jacket, jacket, etc.). The outputs of the nodes for receiving and processing information are connected via a cable or radio telemetry channel to a sequentially located memory unit, an analytical unit and an information display unit. At the same time, the minimum set of sensitive elements used

includes oximetric, electrocardiographic and plethysmographic sensors (see, for example: US 2004249299, A61B 5/00, 5/02, 5/0205, 5/04, 5/08, 5/0452, 5/11, 2004; EP 1631184, A61B 5/00, 5/02, 5/0205, 5/04, 5/08, 5/0452, 5/11, 2006).

Closest to the claimed one is a telemetric system for monitoring physiological parameters, containing underwear with an electrocardiograph, pulse oximeter, induction plethysmograph located in it, the sensors of which are installed with the ability to contact sensitive areas of the body of the subject, the primary signal processing unit and the information block, the input of which is connected to using a telecommunication channel with the output of the primary signal processing unit, and the information output of the electrocardio Rafa is connected to the first input of the primary signal processing unit, the outputs of the pulse oximeter by photoplethysmogram, oxygen content in red blood cells and heart rate are connected to the second, third and fourth inputs of the primary signal processing unit, respectively (WO 01/78577, A61B 5/0205, 5/113 , 2001).

The prototype system has low information, because its output signal does not contain information about such important physiological parameters as blood pressure (BP) and the duration of the pulse wave. In this case, the lack of information about the value of blood pressure is explained by the fact that its measurement is possible only at rest of the subject, while under the conditions of special operations this condition is fundamentally impossible to provide, just as it is impossible to constantly pinch any joints of the subject for measurement purposes.

The technical task of the proposed telemetry system is to increase its information content by determining the value of blood pressure and the duration of the pulse wave of the subject.

The solution to this technical problem lies in the fact that in a telemetry system for monitoring physiological parameters, containing underwear with an electrocardiograph, a pulse oximeter located in it, the sensors of which are installed with the possibility of contacting with sensitive parts of the body of the subject, the primary signal processing unit and the information block, the input of which connected via a telecommunication channel to the output of the primary signal processing unit, the information output of the electrocardiograph connected to the first input of the primary signal processing unit, the outputs of the pulse oximeter according to photoplethysmogram, oxygen content in red blood cells and heart rate are connected to the second, third and fourth inputs of the primary signal processing unit, respectively, the following changes are made:

1. The system further comprises:

- RS-trigger;

- a timer for measuring the duration of the pulse wave propagation;

- unit for calculating blood pressure.

2. The electrocardiograph is additionally equipped with a R-wave marker of the electrocardiogram (ECG).

3. The output of the R-wave marker of the electrocardiogram is connected to the R-input of the trigger.

4. The marker output of the pulse oximeter is connected to the S-input of the trigger.

5. The output of the RS trigger is connected to the timer input.

6. The timer output is connected to the fifth input of the primary signal processing unit and to the input of the blood pressure calculation unit.

7. The output of the blood pressure calculation unit is connected to the sixth input of the primary signal processing unit.

In the technical implementation of the proposed telemetry system as an electrocardiograph, additionally equipped with a marker

R-wave electrocardiogram, Polar WearLink 31 electrocardiograph can be used.

The primary information processing unit is a multi-channel amplifier-converter of the output signals of installed devices, filtering outliers and generating data packets in the format required for transmission over the used communication channel. This unit can be implemented on the basis of Atmel's Atmega 128 microcontroller.

As a block of information, a display panel, a mobile phone, and also a computer can be used.

By the pulse output of a pulse oximeter is meant the inflection point marker of the leading edge of the pulse wave. A pulse oximeter of the OEM III Module brand (manufactured by Nonine Medical Inc.) has such an output.

The changes made determine the duration of the pulse wave propagation. This information is used by the unit for calculating blood pressure, which is a functional converter, the operation of which is described by the adopted approximating function. In particular, with hyperbolic approximation, the output of this block contains information on the average value of blood pressure calculated according to the formula:

Where P is the mean arterial pressure, mmHg;

C is a constant set previously for the subject;

ΔT - pulse wave propagation duration, ms.

The principle of operation of the invention according to patent GB 2058355, АВВ 5/02, 1981 is based on this formula, however, in the proposed technical solution, this principle is implemented with a new set of used

means (pulse oximeter, electrocardiograph with built-in R-wave marker, primary signal processing unit), providing:

a) wearable performance of the basic elements of information retrieval;

b) increasing the stability of determining the trailing edge of the pulse wave, since the position of the inflection point on the photoplethysmogram in the proposed technical solution is subject to much less drift than the position of the corresponding operating point of the specified analogue;

c) better noise immunity due to the introduction of a primary information processing unit, in which the outliers of time interval measurements are smoothed out.

The design described is minimal. In the maximum version, a thermometer and / or induction plethysmograph and an accelerometer-inclinometer are additionally placed in underwear, the outputs of which are connected to the seventh, eighth and ninth inputs of the primary information processing unit, respectively.

To unify the performance, they use a radio telecommunication channel, made using Bluetooth technology.

Figure 1 shows a diagram of the proposed telemetry system in the maximum embodiment.

The telemetry system for monitoring physiological parameters (Fig. 1) contains underwear (shirt) 1 with an electrocardiograph 2, a pulse oximeter 3 located in it, the sensors of which (pos. 4 and 5, respectively) are installed with the possibility of contacting with sensitive parts of the body of the subject, block 6 processing the primary signals and the information unit 7, the input of which is connected via a telecommunication channel with the output of the primary signal processing unit 6. The information output of the electrocardiograph 2 is connected to the first input of the primary signal processing unit 6; the outputs of the pulse oximeter 3 according to photoplethysmogram, oxygen content in red blood cells and pulse rate are connected to the second, third and fourth inputs of the primary signal processing unit 6, respectively. The telemetry system further comprises

RS-trigger 7, timer 8 for measuring the duration of the pulse wave propagation and block 9 calculating the average blood pressure. The electrocardiograph 2 is equipped with an R-wave marker of the electrocardiogram, the output of the R-wave marker of the electrocardiogram is connected to the R input of the RS trigger, the marker output of the pulse oximeter 5 is connected to the 8 input of the RS trigger, the output of the RS trigger is connected to the input of timer 8, the timer output 8 is connected to the fifth input of the primary signal processing unit 6 and to the input of the blood pressure calculation unit 9, and the output of unit 9 is connected to the sixth input of the primary signal processing unit 6.

In this embodiment, a thermometer 10, an induction plethysmograph 11 and an accelerometer-inclinometer 12 with sensors 13, 14 and 15, respectively, are placed in underwear. The outputs of the devices 10, 11 and 12 are connected to the seventh, eighth and ninth inputs of the primary information processing unit 6, respectively.

Block 7 information is located at the control room. Elements 2 ÷ 15 are placed in shirt 1, worn by the survey.

To transmit information from the output of block 6 to the input of block 7, a radio telemetric communication channel is made, including a radio transmitter 16 and a radio receiver 17 tuned to it. This communication channel is implemented using Bluetooth technology.

Devices 2, 3, 8 ÷ 12 collect primary ECG data, photoplethysmogram, oxygen content in red blood cells, pulse rate, body temperature, respiratory system state and body position of the subject in space (inclination and acceleration of body movement controlled by an accelerometer-inclinometer). At the same time, when passing the R-wave of the ECG, the electrocardiograph marker 2 switches the RS-trigger 7 to the “1” position on the R-input, thereby starting timer 8 to start the count of the duration of the pulse wave propagation. Upon receipt of a single signal from the marker output of the pulse oximeter 3 at the S-input of trigger 7, the signal is switched at the output of trigger 7, which, upon entering timer 8, stops the latter, thereby fixing the pulse wave propagation duration. Last signal from timer output 8

arrives at block 6 for processing and transmission to the display. In addition, information about the duration of the pulse wave from the output of the timer 8 is fed to the input of block 9, which calculates the average blood pressure value by formula (1) and transfers it to the sixth input of block 6.

In block 6, they filter the primary data with respect to random outliers and convert them into a packet of the format accepted for transmission over the radio channel used. The message transmitted via the radio telecommunication channel is sent to the information block 7, where it is stored and analyzed by the dispatcher.

Using the proposed technical solution in comparison with the prototype allows to increase the information content of monitoring by determining the value of blood pressure and the duration of the pulse wave of the subject. At the same time, the reliability of the examination is increased by reducing the drift of the operating point, which determines the boundary of the trailing edge of the pulse wave. A positive result, derived from the achieved, is the wearable performance of elements located on the transmitting side, including elements that provide the system with new functionality.

Claims (3)

1. A telemetry system for monitoring physiological parameters, containing body clothing with an electrocardiograph, pulse oximeter located in it, the sensors of which are installed with the possibility of contacting with sensitive parts of the body of the subject, a primary signal processing unit and an information block, the input of which is connected via a telecommunication channel to the output of the block processing the primary signals, and the information output of the electrocardiograph is connected to the first input of the processing unit of the primary signals, the outputs of the pulse oximeter according to photoplethysmogram, oxygen content in red blood cells and heart rate are connected to the second, third and fourth inputs of the primary signal processing unit, respectively, characterized in that it additionally contains an RS trigger, a timer for measuring the pulse wave propagation duration, and a blood pressure calculation unit in this case, an electrocardiograph equipped with an R-wave marker of the electrocardiogram was used, the output of the R-wave marker of the electrocardiogram is connected to the R-input of the RS-trigger, brand The pulse oximeter output is connected to the S-input of the RS-trigger, the RS-trigger output is connected to the timer input, the timer output is connected to the fifth input of the primary signal processing unit and to the input of the blood pressure calculation unit, and the output of the blood pressure calculation unit is connected to the sixth input of the block processing primary signals. 2. The telemetry system according to claim 1, characterized in that the thermometer and / or induction plethysmograph and the accelerometer-inclinometer are additionally placed in underwear, the outputs of which are connected to the seventh, eighth and ninth inputs of the primary information processing unit, respectively. 3. The telemetry system according to claim 1 or 2, characterized in that the telecommunication channel is made using Bluetooth technology.