WO1998041143A1 - Detecteur d'onde d'impulsion et pulsometre - Google Patents
Detecteur d'onde d'impulsion et pulsometre Download PDFInfo
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- WO1998041143A1 WO1998041143A1 PCT/JP1998/001128 JP9801128W WO9841143A1 WO 1998041143 A1 WO1998041143 A1 WO 1998041143A1 JP 9801128 W JP9801128 W JP 9801128W WO 9841143 A1 WO9841143 A1 WO 9841143A1
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- pulse wave
- pulse
- wave signal
- signal
- frequency
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7203—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal
- A61B5/7207—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal of noise induced by motion artifacts
- A61B5/721—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal of noise induced by motion artifacts using a separate sensor to detect motion or using motion information derived from signals other than the physiological signal to be measured
-
- 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
- A61B5/024—Detecting, measuring or recording pulse rate or heart rate
-
- 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
- A61B5/024—Detecting, measuring or recording pulse rate or heart rate
- A61B5/02438—Detecting, measuring or recording pulse rate or heart rate with portable devices, e.g. worn by the patient
-
- 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
- A61B5/024—Detecting, measuring or recording pulse rate or heart rate
- A61B5/02416—Detecting, measuring or recording pulse rate or heart rate using photoplethysmograph signals, e.g. generated by infrared radiation
- A61B5/02427—Details of sensor
-
- 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
- A61B5/024—Detecting, measuring or recording pulse rate or heart rate
- A61B5/0245—Detecting, measuring or recording pulse rate or heart rate by using sensing means generating electric signals, i.e. ECG signals
- A61B5/02455—Detecting, measuring or recording pulse rate or heart rate by using sensing means generating electric signals, i.e. ECG signals provided with high/low alarm devices
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7235—Details of waveform analysis
- A61B5/7253—Details of waveform analysis characterised by using transforms
- A61B5/7257—Details of waveform analysis characterised by using transforms using Fourier transforms
Definitions
- the present invention relates to a pulse wave detecting device for detecting a pulse wave, and a pulse meter using the pulse wave detecting device.
- pulse meters that detect and calculate a pulse rate by detecting a pulse wave are commercially available.
- This type of pulse meter calculates a pulse rate using an output signal (pulse wave signal) from a pulse wave detection sensor arranged close to a measured part of the human body.
- a method of calculating the pulse rate a method based on rectangular wave processing and a method based on frequency analysis described below are known.
- a pulse wave signal is converted into a square wave, and the period of the square wave is measured to calculate a pulse rate (the pulse rate is proportional to the reciprocal of the period). That is, the pulse rate is calculated by directly examining the fluctuation of the level of the pulse wave signal in the time domain, and the pulse rate can be calculated with a small amount of computation and a small circuit configuration.
- a pulse wave signal is subjected to frequency analysis, a spectrum line having a maximum level in the resulting spectrum is extracted, and a pulse rate is calculated from the frequency of the spectrum line. That is, the pulse rate is calculated by comparing the level of the pulse wave signal in the frequency domain.
- FFT is usually used as the frequency analysis method.
- the impulse noise is a general term for noise that occurs suddenly, and an example of a pulse wave signal on which the impulse noise is superimposed is shown in FIG.
- FIG. 11A shows a pulse wave signal in the time domain
- FIG. 11B shows a spectrum obtained by performing FFT processing on the pulse wave signal.
- the pulse wave signal abnormally changed during the period tl to t2 in Fig. 11 (a) due to the superposition of impulse noise
- Fig. 11 (b) the basic There are spectral lines at higher levels than the spectral lines SP representing the waves.
- the pulse rate is calculated based on the highest-level spectrum line, so that frequency analysis is performed on the pulse wave signal on which the impulse noise is superimposed as shown in the figure.
- accurate pulse rate cannot be calculated.
- the present applicant monitors the presence or absence of the above-described event that causes the impulse noise, and based on the monitoring result, when there is a possibility that the impulse noise is superimposed, the impulse noise in the pulse wave signal is determined.
- a device that performs a frequency analysis after inserting a dummy signal in a section that includes a dummy signal (for example, period t1 to!: 2 in Fig. 11 (a)) has been proposed. (For details, refer to Japanese Patent Application No. 7-273238. Specification and drawings attached to the application: Japanese Patent Application Laid-Open No. 9-113653). According to this device, for example, as shown in FIG.
- a dummy signal having a value of 0 is inserted in the period tl to t2 during which the impulse noise is superimposed.
- the spectrum line SP representing the fundamental wave of the pulse wave is the highest-level spectrum line.
- the pulse wave detection sensor is usually arranged close to the measurement site of the user, so that when the user is exercising, the body motion component is superimposed on the pulse wave signal.
- a spectrum obtained by performing the FFT processing on the pulse wave signal on which such a body motion component is superimposed is illustrated in FIG. 14 (a).
- the spectral line group on the left side of the figure is a pulse wave component
- the spectral line group on the right side is a body motion component
- the spectral lines of both groups have approximately the same level.
- Fig. 14 (a) is only an example, and in some cases, the highest level spectral line may exist in the spectral line of the body motion component. Therefore, even if frequency analysis is performed on a pulse wave signal on which a body motion component is superimposed, an accurate pulse rate cannot be calculated.
- the present applicant has provided a body motion detection sensor, and obtained an FFT process on the output signal (body motion signal) of the body motion detection sensor from the spectrum shown in FIG. 14 (a). After subtracting the calculated spectrum (Fig. 14 (b)) and obtaining a spectrum consisting only of pulse wave components as shown in Fig. 14 (c), the highest level spectrum line is selected. (For details, refer to Japanese Patent Application Laid-Open No. Hei 7-222733). According to this device, as can be seen from the figure, the selected spectral line is the fundamental of the pulse wave. It becomes a spectral line SP representing a wave. As is clear from the fact that the spectrum is subtracted, the above-described apparatus is premised on frequency analysis.
- the event that causes the impulse noise for example, when applied to a wristwatch type, the ringing of the back-lighting alarm and the like are set in advance and set.
- a dummy signal is inserted into the pulse wave signal.
- general impulse noise may occur regardless of the internal state of the device itself, and it is extremely difficult to detect all such events.
- impulse noise can be completely removed, but all the original pulse wave components will also be removed. That is, it is difficult to remove all the impulse noises while minimizing the influence on the original pulse wave component only by the process (1).
- the detected value outside the window since the detected value outside the window is removed, when the change in the window cannot follow the change in the pulse (for example, when arrhythmia occurs), the detected value becomes abnormal. It is removed as a value.
- the body motion component in the output of the pulse wave detection sensor (the right side in Fig. 14 (a))
- the body motion component in the output of the body motion detection sensor (Fig. 14 (b)) may not completely match. In such a case, even if the latter is subtracted from the former, the body motion The components cannot be completely removed.
- a first object of the present invention is to provide a pulse wave detection device capable of obtaining a pulse wave signal in which a noise component is appropriately removed from a pulse wave waveform. It is a second object of the present invention to provide a pulse meter capable of determining a pulse rate with high accuracy using the pulse wave detection device.
- a first configuration of a pulse wave detection device according to the present invention includes: a pulse wave detection sensor that detects a pulse wave and outputs a pulse wave signal; and an output from the pulse wave detection sensor.
- a variable characteristic filter for filtering and outputting a pulse wave signal to be output, a pulse rate calculating means for calculating a pulse rate based on the pulse wave signal filtered by the filter, and a pulse rate calculating means.
- a characteristic setting means for setting the characteristic of the filter based on the calculated pulse rate; and setting a characteristic corresponding to the pulse rate calculated based on the filtered pulse wave signal in the filter. Like that. Therefore, components other than the pulse wave component in the filtered pulse wave signal can be reduced, and the pulse wave can be detected with higher accuracy.
- a buffer for temporarily storing the pulse wave signal output from the pulse wave sensor and then outputting the pulse wave signal to the filter is provided, and the buffer is temporarily stored in the buffer, and the characteristic setting unit detects the impulse noise detection.
- the characteristics of the filter may be set in consideration of the detection result of the means.
- the above-mentioned filter selectively performs filtering on the pulse wave signal in which the above-mentioned impulse noise detecting means detects the impulse noise, thereby greatly reducing or removing the original pulse wave component. Therefore, the impulse noise component can be reduced or eliminated.
- the filter is configured such that a passing level of a pulse wave signal gradually decreases from a reference frequency to a lower limit frequency and an upper limit frequency of a fundamental wave of the pulse wave
- the characteristic setting unit includes:
- the filter characteristic may be set by setting the reference frequency.
- the noise component can be reduced as a whole without significantly reducing or removing the original pulse wave component.
- the reference frequency is a frequency corresponding to the previous pulse rate.
- the characteristic setting unit may be configured to change a characteristic set in the filter according to a pulse rate fluctuation state calculated by the pulse rate calculation unit.
- the pulse wave can be detected with higher accuracy.
- a second configuration of the pulse wave detection device includes: a pulse wave detection sensor that detects a pulse wave and outputs a pulse wave signal; and the pulse wave detection sensor.
- a variable characteristic filter that filters and outputs a pulse wave signal output from the body, a body movement detection sensor that detects body movement and outputs a body movement signal, and a body that is output from the body movement detection sensor.
- Pitch calculating means for calculating a pitch of body movement based on a motion signal
- characteristic setting means for setting characteristics of the filter based on the pitch calculated by the pitch calculating means.
- a characteristic is set according to the pitch of the body movement calculated based on the body movement signal output from the body movement detection sensor. Therefore, it is possible to reduce noise components due to body motion in the filtered pulse wave signal, and it is possible to detect a pulse wave with higher accuracy.
- the characteristic setting unit may be configured to change a characteristic set for the fill in accordance with a change in pitch calculated by the pitch calculation unit.
- the pulse wave can be detected with higher accuracy.
- the pulse wave detecting device of each of the above configurations includes a pulse rate calculating means for calculating a pulse rate based on the pulse wave signal filtered in the filter, and a pulse rate calculated by the pulse rate calculating means.
- a pulse rate calculating means for calculating a pulse rate based on the pulse wave signal filtered in the filter, and a pulse rate calculated by the pulse rate calculating means.
- FIG. 1 is a diagram showing a wearing mode of a pulse meter according to an embodiment of the present invention.
- FIG. 2 is a plan view showing the main body of the pulse monitor with a wristband, cables, and the like removed.
- FIG. 3 is a side view of the pulse monitor viewed from the direction of 3 o'clock.
- FIG. 4 is a cross-sectional view of a pulse wave detection sensor unit 30 of the pulse meter.
- FIG. 5 is a block diagram illustrating a configuration of a main part of a control unit 5 configured inside the main body of the pulse meter.
- FIGS. 6A and 6B are graphs showing examples of characteristics of a digital filter in a pulse meter.
- FIG. 6A shows characteristics of a first digital filter
- FIG. 6B shows characteristics of a second digital filter
- FIG. This shows the characteristics of the third digital filter.
- FIG. 7 is a flowchart showing a flow of basic processing of the pulse monitor.
- FIG. 8 is a diagram for explaining a process of obtaining a frequency of a fundamental wave of body motion in the pulse meter.
- Fig. 9 (a) shows an example of the waveform of the pulse wave signal before fill-in processing by the first digital fill-in of the pulse meter
- Fig. 9 (b) shows the result of the FFT processing in Fig. 9 (a).
- Fig. 10 (a) shows an example of the waveform of the pulse wave signal after the signal of Fig. 9 (a) is filled with the first digital filter
- Fig. 10 (b) is the FFT processing of Fig. 10 (a). It is a figure showing a result.
- FIGS. 11 (a) and 11 (b) are diagrams each showing an example of a pulse wave signal on which impulse noise is superimposed.
- FIG. 11 (a) shows a pulse wave signal in the time domain, and
- FIG. 11 (b) shows a pulse wave signal in the time domain.
- Fig. 12 is a diagram for explaining the conventional impulse noise elimination processing.
- Fig. 12 (a) shows the pulse wave signal in the time domain
- Fig. 12 (b) shows the pulse wave signal in Fig. 12 (a).
- 4 shows a spectrum obtained by performing FFT processing.
- FIG. 13 is a diagram for explaining conventional window processing.
- FIGS. 14 (a), (b) and (c) are diagrams for explaining the conventional body motion component removal processing
- FIG. 14 (a) shows a pulse wave signal on which a body motion component is superimposed.
- Fig. 14 (b) shows the spectrum obtained by performing the FFT processing on the body motion signal
- Fig. 14 (c) shows the spectrum obtained by performing the FFT processing on the body motion signal.
- Figs. 14 (a) to 14 (b) Shows the spectrum as a result of subtracting.
- BEST MODE FOR CARRYING OUT THE INVENTION embodiments of the present invention will be described with reference to the drawings.
- the pulse meter according to the present embodiment has a function as a general digital wristwatch, and is used by switching between a clock mode and a pulse meter mode.
- FIG. 1 is a view showing a mounting mode of the pulse monitor, in which an apparatus main body 10 having a wristwatch structure, a cable 20 connected to the apparatus main body 10, and a distal end side of the cable 20 are provided.
- a pulse wave detection sensor unit pulse wave detection sensor
- the device main body 10 is provided with a wristband 12 that is wound around the wrist from the 12 o'clock direction of the wristwatch and fixed at the 6 o'clock direction. With the wristband 12, the device main body 10 is attached to the wrist. It is removable.
- the pulse wave detection sensor unit 30 is attached to the base of the index finger while being shielded from light by the sensor fixing band 40. Reasons for attaching the pulse wave detection sensor unit 30 to the base of the finger include removing obstacles during exercise by reducing the length of the cable 20 and reducing the influence of outside air.
- FIG. 2 is a plan view showing the main body of the pulse monitor with a wristband and a cable removed
- FIG. 3 is a side view of the pulse monitor as viewed from 3 o'clock.
- the device main body 10 is provided with a watch case 11 (main body case) made of resin.
- a pulse rate and the like are provided on the front side of the watch case 11, in addition to the current time and date.
- a liquid crystal display device 13 (display device) for displaying pulse wave information and the like is configured.
- the liquid crystal display device 13 has a first segment display area 13 1 located on the upper left of the display surface, a second segment display area 13 2 located on the upper right, and a second segment display area 13 2 located on the lower right.
- 3 segment display area 1 3 3 and dot display area 1 3 4 located on the lower left side are provided.
- Various information can be displayed graphically in the dot display area 134.
- control for the display device is performed so that changes in pulse rate and the like are displayed on the liquid crystal display device 13 based on the detection result (pulse wave signal) of the pulse wave detection sensor unit 30.
- a control unit 5 for performing signal processing on detection signals and the like. Since the control unit 5 also includes a timekeeping circuit, normal time, lap time, split time, and the like can be displayed on the liquid crystal display device 13.
- Button switches 11 1 to 1 1 are provided on the outer periphery and surface of the clock case 11 for time adjustment, mode switching, lap time, external operation to start measurement of pulse wave information, and the like. 17 are provided.
- the power supply of the arm-mounted pulse wave measuring device 1 is a button-shaped battery 59 built in the watch case 11, and the cable 20 supplies power from the battery 59 to the pulse wave detecting sensor unit 30.
- the detection result of the pulse wave detection sensor unit 30 is input to the control unit 5 of the watch case 11.
- the pulse meter 1 was used to increase the size of the main unit 10 at 3 o'clock and 9 o'clock, and at 9 o'clock in a wristwatch. And a large overhanging portion 101 in the direction of the wristband.
- the wristband 12 is connected at a position biased toward the 3 o'clock direction.
- a flat piezoelectric element 58 for a buzzer (for generating a notification sound) is arranged at 9 o'clock with respect to the battery 59. Since the battery 59 is heavier than the piezoelectric element 58, the position of the center of gravity of the apparatus main body 10 is biased toward 3 o'clock, but the wristband 12 is connected to this biased side to change the mounting state. Has stabilized. Furthermore, the main body 10 is made thinner by arranging the battery 59 and the piezoelectric element 58 in the plane direction, and the battery 59 is easily replaced by providing the battery lid 118 on the back surface 119. Has been realized.
- A—3 Structure for attaching the pulse meter body to the arm
- FIG. 3 in the direction of 12 o'clock of the watch case 11, there is formed a connecting portion 105 for holding the retaining shaft 121 attached to the end of the wristband 12: In the direction of 6 o'clock in the watch case 1 1, the wristband 12 wrapped around the arm is folded back in the middle position in the length direction, and the bracket 1 2 2 for holding this middle position is attached. A part 106 is formed.
- the part from the back part 119 to the receiving part 106 is formed integrally with the watch case 11 and is approximately 1 15 with respect to the back part 119.
- the rotation stop portion 108 has an angle of °. That is, when the main unit 10 is worn by the wristband 12 so as to be positioned on the upper surface L1 (on the back of the hand) of the right wrist L (arm), the rear surface 1 19 of the watch case 11 While being in close contact with the upper surface L1 of the wrist L, the rotation stopper 108 is in contact with the side L2 where the rib bone R is located.
- the back part 1 19 of the main body 10 feels as if it straddles the lumbar R and the ulna U, while the rotation stop part 108 stops the rotation from the bent part 109 of the back part 1 19 From the part 108, it feels like it touches the bone bone R.
- the rotation stop portion 108 and the back surface portion 119 form an anatomically ideal angle of about 115 °, the main body 10 is moved in the direction of the arrow A, and However, even if the user tries to turn the device main body 10 in the direction of arrow B, the main body 10 is not unnecessarily shifted.
- the back part 119 and the rotation stop part 108 only restrict the rotation of the main body 10 at two places on one side around the arm, even if the arm is thin, the back part 119 and The anti-rotation portion 108 is securely in contact with the arm, so that the anti-rotation effect is reliably obtained, but the arm does not feel cramped even if it is thick.
- A— 4 Pulse wave detection sensor unit configuration
- FIG. 4 is a cross-sectional view of the sensor unit for detecting a pulse wave in the present embodiment.
- the pulse wave detection sensor unit 30 has a component storage space 300 formed inside by covering a cover 302 on the back side of a sensor frame 36 as a case body. .
- a circuit board 35 is arranged inside the component storage space 300.
- An LED 31, a phototransistor 32, and other electronic components are mounted on the circuit board 35.
- An end of the cable 20 is fixed to the pulse wave detection sensor unit 30 by a bush 393, and each wiring of the cable 20 is soldered on a pattern of each circuit board 35.
- the pulse wave detection sensor unit 30 is applied to the finger so that the cable 20 is pulled out from the base of the finger toward the device body 10. It is attached.
- the LED 31 and the phototransistor 32 are arranged along the length direction of the finger, of which the LED 31 is located at the tip of the finger and the phototransistor 32 is located at the base of the finger. Therefore, external light is less likely to reach the phototransistor 32.
- a light transmitting window is formed by a light transmitting plate 34 made of a glass plate on the upper surface portion (substantial pulse wave signal detecting portion) of the sensor frame 36.
- the LED 31 and the phototransistor 32 have their light emitting surface and light receiving surface facing the light transmitting plate 34, respectively. For this reason, when the finger surface is brought into close contact with the outer surface 341 of the light transmitting plate 34 (the contact surface with the finger surface, the sensor surface), the LED 31 emits light toward the finger surface, and the phototransistor is turned off. 32 receives the light reflected from the finger side of the light emitted by the LED 31.
- the outer surface 341 of the light transmitting plate 34 is configured to protrude from the surrounding portion 361 in order to enhance the adhesion between the outer surface 341 of the light transmitting plate 34 and the finger surface.
- an InGaN-based (indium-gallium-nitrogen-based) blue LED is used as the LED 31, and its emission spectrum has an emission peak at 450 nm, and its emission wavelength region is Range from 350 nm to 600 nm.
- a GaAs P-based (gallium-arsenic-phosphorus-based) phototransistor is used as the phototransistor 32 in response to the LED 31 having such light emission characteristics. Has a main sensitivity range from 300 nm to 600 nm, and a sensitivity range below 300 nm.
- the pulse wave detection sensor unit 30 configured as described above is attached to the base of the finger by the sensor fixing band 40, and in this state, when light is emitted from the LED 31 toward the finger, the light reaches the blood vessel. Some of the light is absorbed by hemoglobin in the blood and some is reflected. The light reflected from the finger (blood vessel) is received by the phototransistor 32, and the change in received light pressure corresponds to the change in blood pressure (pulse wave of blood). In other words, when the blood volume is large, the reflected light is weak, while when the blood pressure is low, the reflected light is strong. Therefore, if a change in the reflected light intensity is detected, the pulse rate and the like can be measured.
- the LED 31 having an emission wavelength range of 350 nm to 600 nm and the phototransistor having an emission wavelength range of 300 nm to 600 nm 3 2 The pulse wave information is displayed based on the detection results in the wavelength range from about 300 nm to about 600 nm, which is the overlapping area, that is, the wavelength range of about 700 nm or less. I do. If such a pulse wave detection sensor unit 30 is used, even if external light hits the exposed part of the finger, light having a wavelength range of 70 O nm or less among the light included in the external light is converted to a photo-guide using the finger as a light guide. It does not reach the transistor 32 (light receiving part).
- A—5 Connection structure between the pulse meter main unit and the pulse wave detection sensor unit
- a connector portion 70 is formed on the surface side of the portion extending as the rotation stopping portion 108, and there is a connector portion 70.
- the connector piece 80 formed at the end of the cable 20 can be attached and detached. Therefore, if the connector piece 80 is detached from the connector part 70, the pulse wave meter 1 can be used as a normal wristwatch / stopwatch (in this case, a predetermined connector cover is attached and the connector part 70 is attached). Protect) .
- FIG. 5 is a block diagram showing a configuration of a main part of the control unit 5 formed inside the main body of the pulse meter.
- a body such as an acceleration sensor is provided inside the main body of the pulse meter.
- a motion detection sensor 101 is provided, and the control unit 5 controls the body motion detection sensor. Based on the detection result of the sensor 101 (body motion signal) and the detection result of the pulse wave detection sensor 30 (pulse wave signal), a configuration is provided for obtaining the pulse rate and the exercise pitch.
- 501 is a pulse wave signal amplification circuit that amplifies and outputs the detection result (pulse wave signal) of the pulse wave detection sensor unit 30, and 502 is a pulse wave signal amplification circuit 501.
- An AZD converter that converts an output (analog voltage signal) into a digital signal of a predetermined bit (for example, 127-127) and outputs it, 503 temporarily stores the output of the AZD converter 502 Output buffer.
- the capacity of the buffer 503 is appropriately set in accordance with the detection time (for example, 16 seconds) in the subsequent frequency analysis.
- a detection value equivalent to 4 seconds can be stored. There is.
- the detected value of 4 seconds in the buffer 503 is output immediately after the end of the impulse noise detection processing described later, so that this 4 seconds hardly affects the delay time of the entire device. Not really.
- Numeral 505 denotes an impulse noise detecting means, which determines whether or not the detected value stored in the buffer 503 is affected by the impulse noise, and outputs a determination result.
- the above determination method is optional, here, “1” is set when the ratio of the detection value outside the predetermined range to the total number of detection values in the buffer 503 exceeds a predetermined threshold value, In other cases, "0" is output as the judgment result.
- Reference numerals 506 to 508 denote first to third digital filters, which sequentially remove the impulse noise, pseudo window processing, and the body of the pulse wave signal output from the knocker 503. A moving component removal process is performed.
- each digital fill for example, a FIR fill is preferably used.
- Reference numeral 509 denotes a frequency analysis unit that performs frequency analysis (for example, FFT processing) on the pulse wave signal output from the third digital filter 508, and outputs the result (spectrum).
- a storage means capable of storing the pulse wave signal from the digital filter 508 for a predetermined detection time (for example, 16 seconds) is provided.
- reference numeral 510 denotes a body motion signal amplifying circuit that amplifies and outputs the detection result (body motion signal) of the body motion detection sensor 101
- reference numeral 511 denotes an output of the body motion signal amplifying circuit 5 (Analog voltage signal) is converted to a digital signal of a predetermined bit (for example, 127-127).
- the output AZD converter, 512 is a buffer for temporarily storing and outputting the output of the AZD converter 511, and has the same capacity as the buffer 503.
- Reference numeral 513 denotes a frequency analysis unit having the same configuration as that of the frequency analysis unit 509.
- the frequency analysis unit 513 performs a frequency analysis (for example, FFT processing) on the body motion signal output from the buffer 512, and obtains the result (S ⁇ ). Output).
- a frequency analysis for example, FFT processing
- the storage means of each of the frequency analysis units 509 and 513 is provided on the same memory (for example, RAM).
- 5 14 is a pulse wave square wave processing means for converting the pulse wave signal from the pulse wave signal amplifier circuit 501 into a rectangular wave and outputting the same
- 5 15 is a body motion signal from the body motion signal amplifier circuit 5 10
- Signal detecting means that outputs a body motion detection signal when the amplitude of the signal exceeds a predetermined value (for example, 50 [mV])
- 516 is the output result of each frequency analysis section 509, 513
- Pulse wave and body motion component extraction means for extracting and outputting a frequency corresponding to the pulse and a frequency corresponding to the pitch of the body motion from the pulse wave and square wave signal processing means 5
- It is a calculation method switching unit that inputs each frequency from the pulse wave-body motion component extraction unit 5 16 and outputs a signal for calculating the pulse rate and the pitch. Switches the signal to be output to the subsequent stage based on the body motion detection signal.
- the process of obtaining the frequency for the pitch of the body motion (the frequency of the fundamental wave of the body
- the calculation method switching means 5 17 When receiving the no-body-motion signal from the body-motion signal detecting means 5 15, the calculation method switching means 5 17 receives the rectangular wave signal from the pulse-wave rectangular wave processing means 5 14 and the pulse wave The frequency and the frequency corresponding to the pitch of the body motion extracted in 516 are output to the subsequent stage, and the octano converter 502, the buffer 503, the impulse noise detecting means 505, the first to third The operation of the digital filter 506 to 508 and the frequency analysis unit 509 is stopped.
- reference numeral 518 denotes a pulse rate calculating means for calculating a pulse rate based on the frequency of the fundamental wave or the rectangular wave signal of the pulse wave supplied via the calculation method switching means 5 17, and 519 denotes a pulse rate calculating means.
- the calculation of the pulse rate / pitch from the square wave signal is performed by measuring the period of the square wave and measuring This is achieved by multiplying the reciprocal of the value by the constant "60".
- reference numeral 52 denotes a first coefficient calculating means for calculating and outputting a coefficient to be set in the first digital filter 506 based on the calculation result (pulse rate) of the pulse rate calculating means 5 18.
- the characteristic of the first digital filter 506 is determined by the first digital filter 506 when the judgment result of the impulse noise detecting means 505 is “1”, that is, only when the impulse noise is detected.
- the characteristic is represented by the coefficient calculated by the coefficient calculation means 520 of the above. In other cases, the characteristic is a through (all regions pass).
- the coefficients output by the first coefficient calculating means 520 include a reference frequency (reference frequency) fbl and cutoff frequencies f 1 and fh, and the reference frequency fb 1 is detected immediately before.
- the cutoff frequencies f 1 and fh are set based on the pulse rate. For example, when the fluctuation of the pulse rate is large and the stability of the pulse transition is low, the fluctuation of the pulse rate is small and the stability of the pulse transition is high so that the interval with the reference frequency fb 1 is widened.
- the cut-off frequency f so that the distance from the reference frequency f 1 becomes narrow
- f h is set. Note that a mode in which the cutoff frequencies f and f h are set so that the interval from the reference frequency f b 1 is constant can be considered.
- FIG. 6A shows an example of the characteristic of the first digital filter specified by the coefficient value output from the first coefficient calculating means 520.
- the characteristic set in the first digital filter 506 when impulse noise is detected in the impulse noise detecting means 505 is the peak of the peak at which the reference level fb1 has the highest pass level. Type. That is, the signal input to the first digital filter 506 has a low attenuation rate near the reference frequency f b 1 in the frequency domain, and the reference frequency f b
- the attenuation rate increases as the distance from 1 increases, and the cutoff frequency f
- the output value of the first digital filter 506 at the time of impulse noise detection is the weighted average value of the five sample points.
- Reference numeral 521 denotes a second coefficient calculating means for calculating and outputting a coefficient to be set in the second digital filter 507 based on the calculation result (pulse rate) of the pulse rate calculating means 518 (characteristics) Setting means), and the characteristic of the second digital filter 507 is, without exception, the characteristic represented by the coefficient calculated by the second coefficient calculating means 521.
- FIG. 6B shows an example of the characteristic of the second digital filter 507 specified by the coefficient value output from the second coefficient calculating means 521.
- the characteristic set in the second digital filter 507 is a mountain shape in which the attenuation rate of the reference frequency fb1 is the lowest, and the attenuation rate gradually increases toward the base. Becomes
- the second coefficient calculating means 521 includes a storing means for storing a predetermined number of the latest pulse rates, and stores a coefficient corresponding to the fluctuation of the pulse rate stored in the storing means in the second digital filter. Evening Supply to 507 to change the slope of the characteristic ridgeline. For example, when the fluctuation of the pulse rate is small, the inclination of the ridge line is made steep, and when the fluctuation is large, the inclination of the ridge line is made gentle. By doing so, it is possible to reduce a noise component other than the pulse wave component while avoiding a situation in which the pulse wave component is significantly reduced from the pulse wave signal.
- 5 2 2 is a third coefficient calculating means (characteristic setting means) which calculates and outputs a coefficient to be set in the third digital filter 508 based on the calculation result (pitch) in the pitch calculating means 5 19
- the characteristic of the third digital filter 508 is, without exception, the characteristic represented by the coefficient calculated by the third coefficient calculating means 522.
- FIG. 6 (c) an example of the characteristic of the third digital filter 508 specified by the coefficient value output from the third coefficient calculating means 522 is shown in FIG. 6 (c).
- the characteristic set in the third digital filter 508 is a narrowed characteristic at a frequency twice the reference frequency fb 2 (the frequency of the fundamental wave of body motion), that is, the reference frequency fb 2 Frequency component of (body (Dynamic component).
- the third coefficient calculating means 5 22 2 includes a storing means for storing a predetermined number of the latest pitches, and stores a coefficient corresponding to the variation of the pitch stored in the storing means in the third digital filter 5.
- Supply to 0 8 to change the strength of the constriction For example, when the fluctuation of the pitch is small, the above-mentioned constriction is strengthened, and the component of the double frequency of the fundamental frequency fb2 is greatly attenuated. When the fluctuation is large, the above-mentioned constriction is weakened and the fundamental frequency fb is reduced. Even a component with a frequency of 2 times should not be attenuated too much. By doing so, it is possible to significantly reduce noise components (body motion components) other than the pulse wave component while avoiding a situation in which the pulse wave component is significantly reduced from the pulse wave signal. .
- noise components body motion components
- the liquid crystal display device 13 numerically displays the pulse rate and the pitch in a predetermined area, but displays pictograms corresponding to the numerical values, graphs indicating the state of the change in the pulse rate and the pitch, and the like. You may do so. Also, a waveform (pulse wave waveform) represented by a pulse wave signal output from the third digital filter 508 may be displayed in a sweep manner.
- circuit elements such as a CPU, a ROM, and a RAM.
- the description of which circuit element realizes the component described above is omitted. From the viewpoint of space saving and cost reduction, it is desirable to design the clock mode and the pulsimeter mode to use the above circuit elements as much as possible.
- FIG. 7 is a flowchart showing the flow of basic processing in the pulse rate mode.
- the pulse wave detection sensor unit 30 and the body motion detection sensor 101 in the pulse meter mode, the pulse wave detection sensor unit 30 and the body motion detection sensor 101 always output a pulse wave signal and a body motion signal.
- the body motion signal output from the body motion detection sensor 101 is amplified by the body motion signal amplification circuit 510 and supplied to the body motion signal detection means 515.
- a body motion detection signal serving as a reference for switching the calculation method of the pulse rate is supplied from the body motion signal detection means 5 15 to the calculation method switching means 5 17.
- the calculation method switching means 5 17 switches the calculation method of the pulse rate (frequency analysis method Z rectangular wave processing method) based on the body motion detection signal supplied from the body motion signal detection means 5 15 (step S40) 1, 402).
- the body motion detection signal is supplied from the body motion signal detection means 5 15 and when the time during which the body motion detection signal is not supplied is less than a predetermined time, And the pulse wave / body motion component extraction means 5 16 is supplied as it is to the subsequent pulse rate calculation means 5 18 and the pitch calculation means 5 19 to determine the calculation method. Switch to frequency analysis method. Conversely, when the time during which the body motion detection signal is not supplied is equal to or longer than a predetermined time, it is determined that there is no body motion, and the square wave signal and the pulse from the pulse wave square wave processing means 5 14 are determined.
- the calculation method is switched to the square wave processing method by supplying the frequency corresponding to the pitch of the body movement from the wave / body movement component extraction means 5 16 to the subsequent pulse rate calculation means 5 18 and the pitch calculation means 5 19 You.
- operation of unnecessary circuit elements or power supply to the same circuit elements is stopped in each method.
- the pulse wave signal detected by the pulse wave detection sensor 30 is amplified by the pulse wave signal amplification circuit 501, It is converted into a rectangular wave signal by the pulse wave rectangular wave processing means 5 14 and supplied to the pulse rate calculating means 5 18 via the arithmetic method switching means 5 17.
- a body motion signal detected by the body motion detection sensor 101 is amplified by a body motion signal amplifier circuit 510, converted into a digital signal by an AZD converter 511, and converted to a buffer 511. Stored temporarily in 2.
- the body motion signal output from the buffer 512 is subjected to frequency analysis processing (for example, FFT processing with a detection time of 16 seconds) by the frequency analysis section 5222, and the frequency
- frequency analysis processing for example, FFT processing with a detection time of 16 seconds
- the frequency of the fundamental wave of body motion is extracted by the pulse wave / body motion component extracting means 5 16 from the numerical analysis result.
- the pulse wave / body motion component extraction means 516 obtains the frequency of the pulse wave and the fundamental wave of the body motion from the respective frequency analysis results (spectrum) will be described with reference to FIG.
- FIG. 8 is a diagram showing an example of a frequency analysis result of a body motion signal.
- the frequency component of the body motion is more than the frequency component of the fundamental wave (the fundamental wave of the arm swing).
- the frequency component of the second harmonic is at a higher level.
- the fundamental wave of body motion corresponds to a pendulum motion in which the arm swings and pulls back in one cycle.It is difficult to make the arm swing smoothly in normal running, so the level of this component is low.
- the second harmonic component of the body motion is equivalent to the vertical motion that occurs even when the right foot is stepped and the acceleration that is applied to the moment when the arm swings and pulls back when the left foot is stepped. This is because the level of this component is higher.
- the second harmonic component of body motion is characteristically easier to obtain.
- the range where the second harmonic appears can be covered in the range of 2 to 4 [Hz] even if the running pace is fast or slow. Therefore, detection accuracy can be improved by extracting the characteristic second harmonic component after limiting to this region.
- the frequency (fs) of the highest-level spectral line is obtained from the frequency analysis result of the body motion signal, and then, the frequency range of 1Z2 of fs is equal to or higher than a predetermined threshold. It is determined whether or not there is a spectrum line of the level. If it is determined to be present, specify fs as the frequency of the second harmonic of body motion and fs Z 2 as the frequency of the fundamental wave of body motion. If it is determined that the frequency does not exist, fs is assumed to be the frequency of the third harmonic, and whether or not a spectrum line having a level equal to or higher than a predetermined threshold value exists in the frequency domain of fs Z3 is determined.
- fs Z 3 is specified as the frequency of the fundamental wave of body motion
- fs is specified as the frequency of the fundamental wave of body motion.
- the reason for considering up to the third harmonic is that the range of 2 to 4 [Hz] is assumed as the range where the fundamental wave of body motion can exist.
- the frequency of the fundamental wave of the body motion specified in this way is supplied to the pitch calculation means 5 19 via the calculation method switching means 5 17. The above is the process of step S407 in FIG.
- the pulse rate calculating means 5 18 calculates the period (inter-wave value) of the rectangular wave signal supplied via the pulse wave / body motion component extracting means 5 16 and multiplies the reciprocal (frequency) of this period by 60.
- the calculated value is used as the pulse rate
- the pitch calculating means 5 19 sets the pitch obtained by multiplying the frequency supplied via the pulse wave / body motion component extracting means 5 16 by 60 (step S 4 08 ).
- Each calculating means 5 18 is configured to supply the calculated pulse rate to the coefficient calculating means 5 20 and 5 21, and each calculating means 5 19 is configured to supply the calculated pitch to the coefficient calculating means 5 22. However, this supply process is stopped while the rectangular wave processing method is selected (of course, the supply process may be continued in any case).
- the pulse wave number and the pitch calculated by the calculation means 518 and 519 are supplied to the liquid crystal display device 13 and displayed, and visually recognized by the user (step S409). Needless to say, a mode may be adopted in which the pulse rate and pitch are notified by voice, and appeal is made to the senses other than the visual sense.
- the pulse wave signal detected by the pulse wave detection sensor unit 30 is amplified by the pulse wave signal amplifier circuit 501, and the A / D converter 50 The signal is converted into a digital signal (takes an integer value of, for example, 127 to 127) by 2 (step S403), and is temporarily stored in the buffer 503.
- the same processing as that of the above-mentioned “B-2: rectangular wave processing method” is performed on the body motion signal, and the frequency of the fundamental wave of the body motion is obtained.
- the pulse wave signal temporarily stored in the buffer 503 is subjected to filter processing by the first to third digital filters 506 to 508, and a noise component in the pulse wave signal is processed. Is reduced or eliminated (step S404).
- this filter processing will be described in order.
- the impulse noise detection means 505 sends a signal indicating that no impulse noise was detected (for example, if the value is " 0 ") is output from the buffer 503 to the first digital filter 506 at the timing when the detected value is output.
- the first digital filter 506 includes a first coefficient calculating means based on the pulse rate calculated immediately before.
- the coefficient calculated by 520 is supplied, since a signal indicating that no impulse noise is detected is supplied from the impulse noise detecting means 505, the characteristics thereof are all-through. Therefore, the pulse wave signal is supplied to the second digital filter 507 as it is.
- the detection value stored in the buffer 503 is affected by the impulse noise, specifically, the ratio of the detection value outside the predetermined range to the total number of detection values in the buffer 503 is If the predetermined threshold value is exceeded, a signal indicating that impulse noise has been detected (for example, a signal having a value of “1”) is sent from the impulse noise detection means 505 to the buffer 503. Output at the timing when the above detection value is output to the digital filter 506 of 1.
- the characteristics of the first digital filter 506 are as shown in FIG. 6A, and components other than the expected frequency component of the pulse wave are attenuated or cut off.
- FIG. 9 (a) shows an example of the waveform of the pulse wave signal before filtering by the first digital filter 506
- FIG. 9 (b) shows the FFT processing result thereof
- FIG. Fig. 10 (a) shows an example of the waveform of the pulse wave signal after the digital filter 506 of Fig. 1 is applied
- Fig. 10 (b) shows the result of the FFT processing.
- the first digital filter 506 significantly attenuates low-frequency components (impulse noise). That is, the first digital filter 506 significantly reduces or eliminates the impulse noise component in the pulse wave signal.
- the coefficient calculated by the second coefficient calculating means 521 based on the pulse rate calculated immediately before is supplied to the second digital filter 507.
- the characteristic is such that the degree of attenuation increases with distance from the frequency of the pulse wave. Therefore, noise components other than the impulse noise are also attenuated here.
- the pulse rate is sudden, like at rest T If the frequency does not change drastically, frequencies slightly deviating from the expected pulse wave frequency are also considered to be noise components.
- the second coefficient calculating means 5 21 sets the slope of the ridge line in FIG. 6 (b) to be steep when the change in pulse rate is small, and to make the slope gentle when the change in pulse rate is large.
- the noise component is attenuated without much attenuating the original pulse wave component.
- the third digital filter 508 is supplied with the coefficients calculated by the third coefficient calculating means 522 on the basis of the pitch calculated immediately before, and the characteristics are shown in FIG. 6 (c). It has become something like As described above, since the reference frequency fb 2 is the frequency of the fundamental wave of the body motion, the third digital filter 508 attenuates the fundamental wave component and the harmonic component of the body motion in the pulse wave signal. .
- the third coefficient calculating means 5 2 (c) The constriction is strengthened, and if the change in the pitch is large, the constriction is weakened. If the pitch does not change rapidly, the body motion component is greatly attenuated and removed, and the If the pitch fluctuates rapidly, the previous pitch may be significantly different from the current pitch, so the attenuation of the body motion component is kept to a small extent.
- the pulse wave signal thus shaped is subjected to predetermined frequency analysis processing (FFT processing with a detection time of 16 seconds in this embodiment) by the frequency analysis section 509 (step S405).
- predetermined frequency analysis processing FFT processing with a detection time of 16 seconds in this embodiment
- the pulse wave / body motion component extraction means 516 specifies the frequency of the pulse wave and the fundamental wave of the body motion from the results of each frequency analysis (spectrum) (step S406).
- the process of obtaining the frequency of the fundamental wave of the pulse wave will be described.
- the pulse wave / body motion component extraction means 5 16 first selects spectral lines in descending order from the frequency analysis result of the pulse wave signal, and sequentially selects the frequency of the selected spectral line and the fundamental wave of body motion. Compare the frequency (for example, fs / 2) and the frequency of harmonics (for example, fs, 3fs / 2), and if they do not match, replace the frequency of the relevant spectral line with that of the pulse wave. Specified as T / JP9 wave frequency. The frequency of the fundamental wave of the pulse wave specified in this way is supplied to the pulse rate calculating means 5 18 via the calculating method switching means 5 17.
- the fundamental and harmonic components of body motion in the pulse wave signal are greatly attenuated or eliminated by the third digital filter 509.
- the frequency of the highest-level spectrum line in the analysis result may be specified as the frequency of the fundamental wave of the pulse wave.
- the amount of attenuation of the fundamental and harmonic components of the body motion due to the third digital filter is small, so the remaining body motion component There is a possibility that this spectrum line will be selected as the spectrum line of the fundamental wave of the pulse wave. Therefore, it is desirable to change the processing according to the degree of change in pitch.
- the pulse rate calculating means 518 supplied with the frequency of the fundamental wave of the pulse wave calculates the pulse rate from the frequency, and the pulse rate is calculated by the liquid crystal display device 13 and the first coefficient calculating means. 5 20 and the second coefficient calculating means 5 2 1. Further, the pitch calculating means 519 supplied with the frequency of the fundamental wave of the body motion calculates the pitch from the frequency, and the pitch is supplied to the liquid crystal display device 13 and the third coefficient calculating means 522. (Step S408).
- the values supplied to 2 are the respective frequencies supplied via the operation method switching means 5 17, and the respective coefficient calculating means 5 20 to 5 2 2 calculate the coefficients based on the respective frequencies. May be designed.
- the pulse rate and the pitch supplied to the liquid crystal display device 13 are displayed in the corresponding area and notified to the user (step S409).
- the noise components in the pulse wave signal can be attenuated or removed by the first to third digital filters 506 to 508.
- the accuracy of the pulse rate detection process by analysis can be improved.
- the pulse wave signal itself is shaped, for example, in a mode in which the pulse wave waveform itself is displayed, a more accurate pulse wave waveform can be displayed.
- the first digital filter when no impulse noise is generated, the whole area is through, so that it is not necessary to filter the pulse wave signal on which the impulse noise is not superimposed.
- the impulse noise component is mainly attenuated or removed by the filtering, there is no possibility that the original pulse wave component in the overlap portion of the impulse noise is largely attenuated or removed.
- the second digital filter there is no frequency component to be removed, and only attenuation is performed, so even if the pulse rate changes suddenly, the original pulse wave component is removed. There is no danger.
- the third digital filter greatly attenuates or removes the frequency components of the fundamental wave and the higher harmonics of the body motion, the subsequent processing can be reduced.
- the characteristics can be changed according to the degree of change in the pulse rate or the pitch, so that a more accurate pulse waveform and pulse rate can be obtained. Can be.
- the first to third digital filters are used at the same time, but it is also possible to use only one or two of them. Further, the second and third digital filters may be combined so as to be realized as one file. Furthermore, a mode in which the buffer and the impulse noise detection means are omitted and the first digital filter is used for all pulse wave signals can be considered. In this case, the first to third digital filters can be realized as one filter. Also, the mounting mode is not limited to a wristwatch such as a necklace or glasses. Of course, the device may be a pulse meter alone or a device for detecting a pulse wave.
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Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US09/180,341 US6155983A (en) | 1997-03-17 | 1998-03-17 | Pulse wave detecting device and pulse measurer |
EP98907274A EP0922433A4 (en) | 1997-03-17 | 1998-03-17 | PULSE WAVE DETECTOR AND PULSOMETER |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP06348797A JP3584143B2 (ja) | 1997-03-17 | 1997-03-17 | 脈波検出装置および脈拍計 |
JP9/63487 | 1997-03-17 |
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WO1998041143A1 true WO1998041143A1 (fr) | 1998-09-24 |
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PCT/JP1998/001128 WO1998041143A1 (fr) | 1997-03-17 | 1998-03-17 | Detecteur d'onde d'impulsion et pulsometre |
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US (1) | US6155983A (ja) |
EP (1) | EP0922433A4 (ja) |
JP (1) | JP3584143B2 (ja) |
WO (1) | WO1998041143A1 (ja) |
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JPS5825102U (ja) * | 1981-08-13 | 1983-02-17 | 松下電工株式会社 | 脈拍検出回路 |
JPH01288230A (ja) * | 1988-05-14 | 1989-11-20 | Matsushita Electric Works Ltd | 脈拍検出装置 |
JP3075169B2 (ja) * | 1996-02-29 | 2000-08-07 | ヤマハ株式会社 | 半導体記憶装置 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4105457A1 (de) * | 1991-02-21 | 1992-09-03 | Seca Gmbh | Verfahren und vorrichtung zur nichtinvasiven kontinuierlichen blutdruckmessung bei menschen |
JP3422128B2 (ja) * | 1994-11-15 | 2003-06-30 | オムロン株式会社 | 血圧計測装置 |
JP3605216B2 (ja) * | 1995-02-20 | 2004-12-22 | セイコーエプソン株式会社 | 脈拍計 |
US5868679A (en) * | 1996-11-14 | 1999-02-09 | Colin Corporation | Blood-pressure monitor apparatus |
-
1997
- 1997-03-17 JP JP06348797A patent/JP3584143B2/ja not_active Expired - Lifetime
-
1998
- 1998-03-17 WO PCT/JP1998/001128 patent/WO1998041143A1/ja not_active Application Discontinuation
- 1998-03-17 EP EP98907274A patent/EP0922433A4/en not_active Withdrawn
- 1998-03-17 US US09/180,341 patent/US6155983A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5825102U (ja) * | 1981-08-13 | 1983-02-17 | 松下電工株式会社 | 脈拍検出回路 |
JPH01288230A (ja) * | 1988-05-14 | 1989-11-20 | Matsushita Electric Works Ltd | 脈拍検出装置 |
JP3075169B2 (ja) * | 1996-02-29 | 2000-08-07 | ヤマハ株式会社 | 半導体記憶装置 |
Non-Patent Citations (1)
Title |
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See also references of EP0922433A4 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7279318B1 (en) * | 1999-06-09 | 2007-10-09 | Hybrid Systems Limited | Modification of biological elements |
Also Published As
Publication number | Publication date |
---|---|
EP0922433A1 (en) | 1999-06-16 |
JPH10258038A (ja) | 1998-09-29 |
EP0922433A4 (en) | 2001-11-14 |
JP3584143B2 (ja) | 2004-11-04 |
US6155983A (en) | 2000-12-05 |
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