WO2009104989A1 - Capteur de monitorage respiratoire et cardiaque à impulsions à très large bande - Google Patents

Capteur de monitorage respiratoire et cardiaque à impulsions à très large bande Download PDF

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Publication number
WO2009104989A1
WO2009104989A1 PCT/RU2009/000082 RU2009000082W WO2009104989A1 WO 2009104989 A1 WO2009104989 A1 WO 2009104989A1 RU 2009000082 W RU2009000082 W RU 2009000082W WO 2009104989 A1 WO2009104989 A1 WO 2009104989A1
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Prior art keywords
output
input
signal
control
signals
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PCT/RU2009/000082
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English (en)
Russian (ru)
Inventor
Сергей Николаевич ПАВЛОВ
Сергей Витальевич САМКОВ
Евгений Владимирович СОЛОДОВ
Original Assignee
Закрытое Акционерное Общество "Нанопульс"
Хауан Терье
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Publication of WO2009104989A1 publication Critical patent/WO2009104989A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/50—Systems of measurement based on relative movement of target
    • G01S13/52—Discriminating between fixed and moving objects or between objects moving at different speeds
    • G01S13/56—Discriminating between fixed and moving objects or between objects moving at different speeds for presence detection
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • 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
    • A61B5/0205—Simultaneously evaluating both cardiovascular conditions and different types of body conditions, e.g. heart and respiratory condition
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/28—Details of pulse systems
    • G01S7/285—Receivers
    • G01S7/288—Coherent receivers
    • G01S7/2886—Coherent receivers using I/Q processing

Definitions

  • Pulsed ultra-wideband sensor for remote monitoring of respiration and heartbeat
  • the invention relates to medical diagnostic devices for studying the physiological functions of living organisms, in particular to ultra-wideband radar diagnostic tools for the diagnosis of respiration and heartbeat of patients.
  • Known pulse ultra-wideband sensor for monitoring the physiological parameters of one or more organs of the patient’s body - application US N ° 2004/0249258 A1, class. A61B 5/05, 2004.
  • the sensor is a pulsed ultra-wideband low power radar.
  • As the sounding reference signal short video pulses are used.
  • the sensor contains a pulsed constant-frequency generator, a transmitter, a transmitting and receiving antenna, a receiver, a unit for generating delayed signals, an analog-to-digital converter, a signal processing unit, an information display unit, a control and synchronization unit that performs advanced statistical processing of signals reflected from the studied objects of the patient .
  • the sensor uses a single-channel signal processing scheme, which does not allow obtaining information about the physiological parameters of the studied object with the required degree of reliability at any point at the working distance, because so-called “blind” zones appear between the sensor and the object under study, in which the phase sensitivity of the sensor is significantly reduced, although the amplitude of the probing signals reflected from the object can be quite large.
  • the presence of “blind” zones and the small width of the sensor range, which is determined by the duration of the reference signals reduces the accuracy of measurements of the physiological parameters of the patient in certain areas of the working distance, and therefore, such a sensor can only be used if the patient is completely still at a strictly fixed calculated distance .
  • Known pulsed ultra-wideband sensor for monitoring the physiological parameters of the patient's breathing and heartbeat - patent US Ns 4085740, class. A61B 5/02, 1978.
  • the sensor contains a modulator, a microwave signal generator, an attenuator, a shunt microwave tee, a phase-shifting circuit, a transmitting and receiving antenna, and a receiver including two channels, each of which includes a detector, an amplifier, and a filter.
  • the modulated microwave signal of the generator using the transmission line (waveguide) is directly fed to the transmitting antenna and is radiated towards the object under study.
  • the microwave signal of the generator as a reference signal, through the attenuator and the shunt microwave tee enters the mixer of the in-phase channel of the receiver and through the phase-shifting circuit providing a phase shift of the reference signal by 90 °, enters the mixer of the quadrature channel of the receiver.
  • the signal reflected from the object under investigation enters the mixers of each channel of the receiver.
  • the signal amplitude is determined, which is a function of the relative angular velocity of rotation of the phases of the signals supplied to the input of the mixer.
  • one channel of the receiver serves to isolate the signal characterizing respiration, and the second - to highlight the signal characterizing the patient's heart rate. Due to the fact that the receiver channels operate independently of each other, the sensor has the same disadvantages: the output signal of the sensor has low information content due to the appearance of “blind” zones in which the sensor cannot simultaneously measure respiration and heartbeat parameters; the use of the sensor is limited to a fixed distance between the sensor and the patient; the use of the sensor is excluded even with a slight movement of the investigated object.
  • the closest analogue is a pulsed ultra-wideband respiratory control sensor - application RU 2006135225, cl. A61B 5/08, decision to grant a patent dated 09/27/2007.
  • the sensor contains a probe signal generating section, including a radio pulse generator, a buffer amplifier and a bandpass filter, a controllable electronic key, a probing signal transmission section, including an amplifier and a bandpass filter, transmitting and receiving antennas, phase-shifting circuit, a path for receiving a reflected signal, including a band-pass filter, an amplifier and a receiver, each channel of which includes a mixer, a band-pass filter, an amplifier, a low-pass filter and an analog-to-digital converter zovatel (ADC), a control unit, a processor and a processing unit. Due to the joint processing of common-mode and
  • SUBSTITUTE SHEET (RULE 26) “blind” zones at a distance between the object under investigation and the sensor during patient diagnostics are excluded from the receiver’s quadrature channels, which allows more accurate restoration of the function and parameters of the object under investigation, in particular, the amplitude of motion and the frequency of oscillations.
  • each radio pulse at the generator output should have a zero phase, and due to the small range of the sensor, the reference radio pulse of the mixers should be formed in the immediate vicinity (along the time axis) from the probe pulse. This time is 4-20 nons. Two short video pulses with a duration of 2-3 ns are used in the sensor to start the radio pulse generator. With such time ranges, the residual oscillations in the generator circuit do not have time to decay to a sufficient degree so as not to affect the formation of the second radio pulse, therefore, in each sounding period, the reference radio pulses have a random initial phase. In addition, due to the jigger of the delay line of the control unit, the reference radio pulse has a position of the leading edge random in time.
  • the formation of the reference radio signal is carried out directly in the generator, and the controlled electronic key only redirects the reference radio signal to the transmission paths of the probing signal and receiving the reflected signal.
  • the instability of the position of the key control pulse in time negatively affects the phase difference between the reference and reflected from the studied object signals in the mixers. It also reduces the phase sensitivity of the sensor.
  • Z 1 (t) is the output signal of the in-phase channel of the receiver
  • Z 2 (t) is the output signal of the quadrature channel of the receiver
  • E m E o EinT o / 2 is the maximum interaction energy of the reflected and probing signals released at the output load with a unit resistance;
  • E 0 is the maximum amplitude of the probe signal
  • T 0 period of oscillations of the probe signal
  • p is an integer number of periods of oscillations filling the pulse of sounding
  • ⁇ 1 phase shift due to the distance between the investigated object and the sensor
  • ⁇ (t) is the instantaneous phase value due to the movement of the object under study
  • ⁇ is the wavelength of the oscillations filling the probe signal
  • ⁇ R is the maximum amplitude of the motion of the investigated object
  • a really probing signal is reflected not only from a moving object under study, but also from stationary objects near it, which introduces an error in the reliability of calculating the function and motion parameters of the object under study.
  • the aim of the present invention is to provide a pulsed ultra-wideband sensor for remote monitoring of respiration and heartbeat according to the movement of the chest of the patient being examined, which allows to increase the accuracy and reliability of measurements of respiration and heartbeat parameters of patients by increasing the phase sensitivity of the diagnosis of the studied object, eliminating blind spots over the entire working distance the sensor even when moving the patient being examined, and also to increase the accuracy of reproduction of the motion function and pairs ametres of the studied object, including by taking into account the reflected signal from stationary objects.
  • a pulsed ultra-wideband sensor for remote monitoring of respiration and heartbeat includes a transmitting and receiving antenna connected to a controlled antenna switch; a microwave signal generating path including a serially connected microwave signal generator, a high-pass filter and a buffer amplifier; controlled electronic key of probing and
  • SUBSTITUTE SHEET (RULE 26) reference signals SUBSTITUTE SHEET (RULE 26) reference signals; a probe signal path including a high-pass filter and a power amplifier connected in series, the output of which is connected to the input of the antenna switch, and the high-pass filter input is connected to the first output of the electronic key; a reflected signal receiver including a low-noise amplifier, in-phase and quadrature channels, each of which includes a series-connected mixer, a low-pass filter, a low-frequency amplifier, a low-frequency protective filter and an ADC, while the input of the low-noise amplifier is connected to the output of the antenna switch, and the output to the inputs mixers; a reference signal path, including a series-connected high-pass filter, a power amplifier and a phase-shifting circuit, the output of which is connected to the second input of the mixer of the quadrature channel of the receiver, the output of the power amplifier is also connected to the second input of the mixer of the in-phase channel of the receiver,
  • the control and synchronization unit comprises a driver of control signals, the output of which is connected to the input of the microwave signal generator, a driver of synchronization signals, the first output of which is connected to the control input of the electronic key, and the second output is connected to the control input of the antenna switch, and the master generator, the output which is connected to the inputs of the driver of the control signals and the driver of the synchronizing signals.
  • the control signal generator comprises an inverter, a controlled delay line, the control input of which is connected to the output of the processing unit, and a logic element "I", the first input of which is connected through the controlled delay line to the output of the inverter, the second input and input of the inverter are connected to the output of the master oscillator, and the output of the AND gate is connected to the input of the microwave signal generator.
  • the generator of synchronizing signals contains two channels for generating synchronizing signals, the inputs of which are connected to the output of the master oscillator, the output of the first channel is connected to the control input of the electronic key, and the output of the second channel is connected to the control input of the antenna switch.
  • Each channel for generating synchronizing signals contains a first delay line connected in series, the input of which is connected to the output of the master oscillator, an inverter and a second delay line, the output of which is connected to the first input of the AND gate, the second input of which is connected to
  • SUBSTITUTE SHEET (RULE 26) the output of the first delay line, and the output is the output of the driver of synchronizing signals.
  • the power amplifier of the probe signal path is made with an adjustable gain.
  • FIG. 1 is a block diagram of a sensor.
  • FIG. 2 is a block diagram of a control and synchronization unit.
  • FIG. 3 is a timing diagram of the signal at the output of the master oscillator.
  • FIG. 4 is a timing diagram of a signal at the output of an inverter of a driver of a control signal.
  • FIG. 5 is a timing diagram of a signal at the output of a controlled delay line of a driver of control signals.
  • FIG. 6 is a timing diagram of the signal at the output of the logic element “AND” of the driver of the control signals.
  • FIG. 7 is a timing diagram of a signal at the output of a first delay line of a channel for generating a control signal of an electronic key of a generator of synchronizing signals.
  • FIG. 3 is a timing diagram of the signal at the output of the master oscillator.
  • FIG. 4 is a timing diagram of a signal at the output of an inverter of a driver of a control signal.
  • FIG. 5 is a timing diagram of a signal at the
  • FIG. 8 is a timing diagram of a signal at the inverter output of a channel for generating a control signal of an electronic key of a generator of synchronizing signals.
  • FIG. 9 is a timing diagram of a signal at the output of a second delay line of a channel for generating a control signal of an electronic key of a generator of synchronizing signals.
  • FIG. 10 is a timing diagram of a signal at the output of an AND gate of a channel for generating a control signal of an electronic key of a generator of synchronizing signals.
  • FIG. 11 is a timing diagram of a signal at the output of a first delay line of a channel for generating a control signal of an antenna switch of a clock driver.
  • FIG. 12 is a timing diagram of a signal at the inverter output of a channel for generating a control signal of an antenna switch of a clock driver.
  • FIG. 13 is a timing diagram of a signal at the output of a second delay line of a channel for generating a control signal of an antenna switch of a clock driver.
  • FIG. 14 is a timing diagram of the signal at the output of the logical element “AND” of the channel for generating the control signal of the antenna switch of the former
  • FIG. 15 is a timing diagram of a signal at the output of a microwave signal generator.
  • FIG. 16 is a timing diagram of a signal at the input of a probe signal path.
  • FIG. 17 is a timing chart of a signal at an input of a reference signal path.
  • FIG. 18 is a timing chart of a sounding signal at an antenna output.
  • FIG. 19 is a timing chart of the reflected signal at the input of the in-phase and quadrature channels of the receiver.
  • FIG. 20 is a timing diagram of the process of multiplying the reference signal and the signal reflected from the object under study in the in-phase channel mixer of the receiver.
  • FIG. 21 is a time diagram of the process of multiplying the phase-shifted by 90 ° reference and reflected from the studied object signals in the mixer of the quadrature channel of the receiver.
  • FIG. 22 is a timing diagram of a signal at the output of a common-mode channel mixer of a receiver.
  • FIG. 23 is a timing diagram of a signal at an output of a mixer of a quadrature channel of a receiver.
  • FIG. 24 is a timing diagram of a low-frequency signal at the output of a protective filter of an in-phase channel of a receiver.
  • FIG. 25 is a timing diagram of a low-frequency signal at the output of a protective filter of a quadrature channel of a receiver.
  • the pulsed ultra-wideband sensor for remote monitoring of respiration and heartbeat includes (Fig. 1) a transmitting and receiving antenna 1, a controlled antenna switch 2, the use of which allows more efficient use of the energy of the generated microwave signal, the microwave signal generation path 3, a controlled electronic key 4 probing and reference signal generation, probe signal path 5, reflected signal receiver 6, reference signal path 7, information display unit 8, processing unit 9, bl ok 10 control and synchronization.
  • the use of a single transmitter-receiver antenna 1 in the sensor allows the receiver 6 to be protected from direct passage of the probing signals in the radiation mode, which reduces the requirements for the dynamic range of the receiver 6, as well as significantly reduce the weight, dimensions and cost of the sensor.
  • the microwave signal generating path 3 includes a serially connected microwave signal generator 11, a high-pass filter 12 and a buffer amplifier 13.
  • the location of the high-pass filter 12 in front of the buffer amplifier 13 allows to increase the stability and spectral frequency of the generated oscillations and reduce jitter (undesired phase and / or random frequency deviation). In the future, this allows to significantly increase the accuracy of the estimated phase of the received
  • SUBSTITUTE SHEET (RULE 26) reflected signal, which in turn allows for higher accuracy of observation of small-amplitude mechanical movements, such as movement of the surface of the chest caused by the work of the heart.
  • the probe signal path 5 includes a high-pass filter 14 and a power amplifier 15 connected in series.
  • the receiver 6 of the reflected signal includes a low noise amplifier 16, in-phase 17 and quadrature 18 channels.
  • the common-mode channel 17 includes a series-connected mixer 19, a low-pass filter 20, a low-frequency amplifier 21, a low-frequency protective filter 22, and an ADC 23.
  • a channel 18 includes a series-connected mixer 24, a low-pass filter 25, a low-frequency amplifier 26, a low-frequency protective filter 27 and ADC 28.
  • Protective filters 22 and 27 eliminate the effect of superposition of the spectra during sampling.
  • the reference signal path 7 includes a series-connected high-pass filter 29, a power amplifier 30, and a phase-shifting circuit 31.
  • the control and synchronization unit 10 (Fig. 2) contains a control signal generator 32, the output of which is connected to the input of the microwave signal generator 11, a synchronization signal generator 33, the first output of which is connected to the control input of the electronic key 4, and the second output is connected to the control input antenna switch 2, and a master oscillator 34, the output of which is connected to the inputs of the shaper 32 of the control signals and the shaper 33 of the synchronizing signals.
  • the driver 32 of the control signals contains an inverter 35, a controlled delay line 36, the control input of which is connected to the output of the processing unit 9, and a logic element "I" 37, the first input of which is connected through the controlled delay line 36 to the output of the inverter 35.
  • the second input of the logic element " And "37 and the input of the inverter 35 are connected to the output of the master oscillator 34, and the output of the logic element" And "37 is connected to the input of the microwave signal generator 11.
  • Shaper of synchronizing signals 33 contains two channels for generating synchronizing signals, the inputs of which are connected to the output of the master oscillator 34, the output of the first channel is connected to the control input of the electronic key 4, and the output of the second channel is connected to the control input of the antenna switch 2.
  • Channel for generating synchronizing signals to control operation the electronic key 4 contains a series-connected first delay line 38, the input of which is connected to the output of the master oscillator 34, an inverter 39 and a second a delay line 40, the output of which is connected to the first input of the AND gate 41.
  • the second input of the AND gate 41 is connected to the output of the first delay line 38, and the output, being the second output of the clock generator 33, is connected to the control input of the electronic key 4.
  • SUBSTITUTE SHEET (RULE 26) clock signal to control the operation of the antenna switch 2 contains a series-connected first delay line 42, the input of which is connected to the output of the master oscillator 34, an inverter 43 and a second delay line 44, the output of which is connected to the first input of the logical element "AND" 45.
  • the second input of the logical element "And” 45 is connected to the output of the first delay line 42, and the output, being the third output of the synchronizer 33, is connected to the control input of the antenna switch 2.
  • the sensor operates as follows.
  • the master oscillator 34 generates clock signals in the form of rectangular video pulses (Fig. 3) with a repetition rate that determines the repetition rate of the sensing pulses (1-2 MHz), which simultaneously enter the driver 32 of the control signals and the driver 33 of the synchronizing signals.
  • the output signals of the master oscillator 34 are fed to the second input of the logical element "And" 37.
  • the inverted (Fig. 4) inverter 35 and the signals (delayed by the controlled delay line 36) (Fig. 5) from the master oscillator are inverted (Fig. 4) 34.
  • the generated rectangular pulses (Fig. 6) have a duration determined by the delay time ⁇ i of the delay line 36.
  • the delay time ⁇ - ⁇ is set by the operator through the processing unit 9 connected to the control input of the line and 36 delays, and determines the range of the sensor.
  • the generated signals are fed from the first output of the driver 32 of the control signals to the triggering input of the microwave signal generator 11, which generates microwave radio pulses with a duration equal to the duration of the triggering video pulses.
  • the output signals of the master oscillator 34 are also input to the shaper 33 of the synchronizing signals having two channels.
  • the first channel generating the electronic key control signal 4 includes a first delay line 38, an inverter 39, a second delay line 40, and an AND gate 41.
  • the delay line 38 provides a delay of the output signals of the master oscillator 34 by time X 2 (Fig. 7) necessary for the formation of microwave radio signals in the generator 11 and their passage through the high-pass filter 12 and the buffer amplifier 13 of the microwave signal generation path 3 so that the leading edge of the control signal (Fig. 10) is fed to the control input of the electronic key 4 at the same time enno beginning with receipt of the microwave radio pulse (FIG. 15) from the output of buffer amplifier 13 to the electronic key input signals 4.
  • the second channel generating the control signal for the antenna switch 2 includes a first delay line 42, an inverter 43, a second delay line 44, and an AND gate 45.
  • the delay time ⁇ 4 of the output signals of the master oscillator 34 is selected so that the beginning of the antenna input switch 2 (Fig. 18) of the probe microwave pulse corresponded to the leading edge of the control signal (Fig. 14) coming from the third output of the control and synchronization unit 10 (from the output of the logic element “AND” 45).
  • Timing diagrams of signals explaining the operation of the channel for generating the control signal of the antenna switch 2 are shown in FIG. 11-14.
  • the switching time of the antenna switch 2 from one position to another is determined by the duration of the output control signals (Fig. 14) and is set by the delay time ⁇ 5 of the delay line 44. This delay time should correspond to the duration of the selected sensing signals.
  • the control and synchronization unit 10 generates a start signal for the generator 11 — a video pulse with a duration of 10 ... 21 nsec, which corresponds to the maximum range of the sensor created from a rectangular video pulse from the output of the master oscillator 34 by the delay line 36.
  • the delay time is set by the operator through the processing unit 9 before the start of measurements and does not change during the measurement.
  • Using the delay line 36 allows you to quickly rebuild and limit the maximum range of the sensor.
  • the formation of one trigger signal of the generator 11 allows you to avoid the formation of the output of the sensor signals corresponding to the "false movement" of the investigated object and / or stationary objects.
  • the generator 11 After the start signal arrives, the generator 11 generates relatively long radio pulses (Fig. 15), which pass through the high-pass filter 12, where harmonic components below ⁇ 5.5 GHz are suppressed, and a buffer amplifier 13, which, in addition to amplification, excludes the influence of the load on the generator circuits 11.
  • a buffer amplifier 13 At the output of the microwave signal generation path 3, we obtain radio pulses with a duration of 10-21 not with a filling frequency of 6.5 GHz and a repetition frequency that depends on the trigger signal, for example, with a sensor range of up to 2 meters - 1 ... 2 MHz.
  • the controlled electronic key 4 extracts a probing signal (Fig. 16) of the order of 2 nsec duration supplied through the high-pass filter 14 and the power amplifier 15 of the probing signal generating path 5 to the input of the controlled electronic switch 2, and a reference signal (Fig. 17) of a duration of the order of 8-19 non, coming through a high-pass filter 29 and a power amplifier 30 of the path 7
  • SUBSTITUTE SHEET (RULE 26) the formation of the reference signals to the input of the mixer 19 of the in-phase channel 17 of the receiver 6, and through the high-pass filter 29, the power amplifier 30 and the phase-shifting circuit 31 of the path 7 of the formation of the reference signals to the input of the mixer 24 of the quadrature channel 18 of the receiver 6.
  • the instability of the position coming from the control unit 10 and synchronization of the control signal of the electronic key 4 in time does not affect the phase difference of the reference and received reflected signals in the mixers 19 and 24, since these signals are formed from a single microwave signal.
  • the signal passes through a high-pass filter 14 with a cutoff frequency of ⁇ 5.5 GHz, which removes the low-frequency harmonics of the electronic key 4 control signals, is amplified by a power amplifier 15 with an adjustable gain to the level necessary to operate at a given range, and is fed to controlled antenna switch 2.
  • Antenna switch 2 provides the operation of the transmit-receive antenna 1 in two modes - for transmitting and for receiving. By default, the antenna 1 operates in the mode of receiving a signal reflected from the object under investigation, and when a signal is supplied from the control and synchronization unit 10 to the control input of the antenna switch 2, the antenna operates in the transmission mode of the probing signal (Fig. 18).
  • the signal reflected from the object under investigation (Fig. 19) with a delay corresponding to the propagation time of the signal to the object and back arrives at antenna switch 2, which, after the radiation of the probe pulse, was switched back to the “receive” position.
  • the signal enters through the low-noise amplifier 16 to the mixer 19 of the common-mode channel 17 of the receiver 6, where it is multiplied (Fig. 20) with the reference radio pulse from the output of the power amplifier 30, and to the mixer 24 of the quadrature channel 18 of the receiver 6, where it is multiplied (Fig. 21) with a phase-shifted phase-shifting circuit 31 phase-locked reference radio pulse from the output of the power amplifier 30.
  • This operation of the sensor in the mode of receiving the reflected signal allows you to provide a protective interval (range), within which the reception of reflected signals is not conducted. This allows you to increase the noise immunity of the receiver 6 from significant passive interference created by objects located in the immediate vicinity of the transmitting and receiving antenna 1.
  • the output signals of the mixers (Fig. 22 and Fig. 23, respectively) pass low-pass filters 20 and 25 with a cutoff frequency of 0.5 kHz.
  • the filters 22 and 27 we obtain signals corresponding to the phase change of the received signal reflected from the object under study with respect to the reference signals (Fig. 24 and Fig. 25, respectively).
  • the ADCs 23 and 28 digitize the signals arriving at them, which are sent to the processing unit 9, which ensures the restoration of the law of motion and determination of motion parameters
  • G1 and G2 are constants corresponding to the level of signals reflected from stationary objects during the examination of the patient.
  • the monitoring results are displayed on the parameters and condition of the respiratory and cardiovascular systems of the examined patient.
  • the gating (range sampling) of the ADCs 23 and 28, as well as the accumulation of responses to the probing signals, made it possible to significantly increase the phase sensitivity of the diagnostics of the studied object and to exclude “blind” zones over the entire working distance of the sensor even when moving the patient being examined, which made it possible to increase the accuracy and the validity of measurements of respiration and heart rate.

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
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  • Life Sciences & Earth Sciences (AREA)
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  • Heart & Thoracic Surgery (AREA)
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Abstract

L’invention concerne des instruments diagnostiques médicaux destinés à examiner les fonctions physiologiques d’organismes vivants et notamment des moyens destinés à effectuer le diagnostic des paramètres respiratoires et cardiaques de patients sur la base d’une technologie radar à très large bande. Le capteur de monitorage respiratoire et cardiaque à impulsions à très large bande comprend une antenne d’émission / réception (1), un commutateur piloté à antenne (2), une voie (3) de formation de signal THF, une clé électronique commandée (4), une voie (5) de signal de sondage, un récepteur (6) de signal réfléchi comprenant un amplificateur à faible bruit (16) et des canaux phase synchronisée (17) et en quadrature (18), une voie (7) de signaux de référence (7), une unité (8) d’affichage d’informations (9) et une unité (10) de commande et de synchronisation.
PCT/RU2009/000082 2008-02-19 2009-02-19 Capteur de monitorage respiratoire et cardiaque à impulsions à très large bande WO2009104989A1 (fr)

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RU2008105888/14A RU2392852C2 (ru) 2008-02-19 2008-02-19 Импульсный сверхширокополосный датчик дистанционного мониторинга дыхания и сердцебиения
RU2008105888 2008-02-19

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