US20110251501A1 - Electronic sphygmomanometer and blood pressure measurement method - Google Patents

Electronic sphygmomanometer and blood pressure measurement method Download PDF

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Publication number
US20110251501A1
US20110251501A1 US13/169,181 US201113169181A US2011251501A1 US 20110251501 A1 US20110251501 A1 US 20110251501A1 US 201113169181 A US201113169181 A US 201113169181A US 2011251501 A1 US2011251501 A1 US 2011251501A1
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Prior art keywords
blood pressure
information
means
cuff
measurement site
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Abandoned
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US13/169,181
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Yukiya Sawanoi
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Omron Healthcare Co Ltd
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Omron Healthcare Co Ltd
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Priority to JP2008333402 priority Critical
Priority to JP2008-333402 priority
Priority to PCT/JP2009/007229 priority patent/WO2010073690A1/en
Application filed by Omron Healthcare Co Ltd filed Critical Omron Healthcare Co Ltd
Assigned to OMRON HEALTHCARE CO., LTD. reassignment OMRON HEALTHCARE CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SAWANOI, YUKIYA
Publication of US20110251501A1 publication Critical patent/US20110251501A1/en
Application status is Abandoned legal-status Critical

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01GWEIGHING
    • G01G19/00Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
    • G01G19/44Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing persons
    • G01G19/50Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing persons having additional measuring devices, e.g. for height
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01GWEIGHING
    • G01G23/00Auxiliary devices for weighing apparatus
    • G01G23/14Devices for determining tare weight or for cancelling out the tare by zeroising, e.g. mechanically operated
    • G01G23/16Devices for determining tare weight or for cancelling out the tare by zeroising, e.g. mechanically operated electrically or magnetically operated

Abstract

An electronic sphygmomanometer includes a cuff to be attached to a blood pressure measurement site, a pump and a valve for adjusting a pressure to be applied on the cuff, a pressure sensor for detecting the pressure in the cuff, a central processing unit (CPU) for calculating a blood pressure value from the cuff pressure, a memory for recording the blood pressure value, and an operation unit for carrying out a blood pressure measurement. The CPU corrects the blood pressure value based on separately acquired correction information and acquires information on a quality of the measurement site as the correction information. When the information on the quality of the measurement site is acquired as the correction information, the CPU corrects the blood pressure calculation parameter based on the information on the quality of the measurement site.

Description

    TECHNICAL FIELD
  • The present invention relates to an electronic sphygmomanometer including a cuff to be attached to a blood pressure measurement site and a blood pressure calculation unit for calculating a blood pressure value from a cuff pressure, and a blood pressure measuring method using the same.
  • BACKGROUND ART
  • A blood pressure is one type of index for analyzing a circulatory disease. Performing risk analysis based on the blood pressure is effective in preventing cardiovascular related diseases such as apoplexy, cardiac arrest, and cardiac infarction. Conventionally, a diagnosis for performing the risk analysis is made from the blood pressure (occasional blood pressure) measured in medical institutions at the time of hospital visits and checkups. However, it is recognized from recent research that the blood pressure (home blood pressure) measured at home is more useful in diagnosing the circulatory disease than the occasional blood pressure. Accompanied therewith, the sphygmomanometer used at home is being widely used.
  • Most of the electronic sphygmomanometers currently being widely used use a blood pressure calculation algorithm of an oscillometric method. In the oscillometric method, a cuff is wrapped around a measurement site such as an upper arm and pressurized up to a predetermined pressure, and then depressurized gradually or in a step-wise manner. The oscillometric method is a method of detecting a change in arterial volume that occurs in the middle of depressurization as a pressure change (pressure pulse wave amplitude) superimposed on the cuff pressure, and applying a predetermined algorithm on the change in pressure pulse wave amplitude to determine the systolic blood pressure and the diastolic blood pressure. Generally, a point where the pressure pulse wave amplitude suddenly becomes large obtained during the depressurization is approximated as the systolic blood pressure, and a point where the pressure pulse wave amplitude suddenly becomes small is approximated as the diastolic blood pressure. Various algorithms have been reviewed to detect such points.
  • For instance, as shown in FIG. 5 and [equation 1] below, a value obtained by multiplying a predetermined ratio to a maximum value of the pressure pulse wave amplitude is set as a blood pressure calculation parameter, and the cuff pressure at which the pressure pulse wave amplitude that matches (or closest to) with the relevant parameter is obtained is calculated as the blood pressure value (see patent document 1).

  • Systolic blood pressure calculation parameter=maximum value of pressure pulse wave amplitude×α

  • Diastolic blood pressure calculation parameter=maximum value of pressure pulse wave amplitude×β  [Equation 1]
  • Patent Document 1: Japanese Unexamined Patent Publication No. 3-81375
  • However, there is no theoretical evidence that the point where the pressure pulse wave amplitude suddenly changes matches with the systolic blood pressure and the diastolic blood pressure. Thus, the ratios (α, β) for determining the blood pressure calculation parameter had to be experimentally or statistically determined based on the change pattern (hereinafter referred to as “envelope curve”) of a great number of blood pressure values and pressure pulse wave amplitudes.
  • First, the pressure pulse wave amplitude is obtained by detecting a volume change of an artery transmitted to the cuff attached to the measurement site as the pressure change. The pressure pulse wave amplitude is thus subjected to the influence of the properties of the cuff. One of the properties of the cuff is an air flow rate (hereinafter referred to as cuff compliance) necessary for changing the pressure in the cuff (hereinafter referred to as cuff pressure) by 1 mmHg as shown in the graph of FIG. 6.
  • The cuff compliance, which is a characteristic of the cuff, differs depending on the quality (hardness) of the measurement site. For instance, in the conventional blood pressure measurement, when two users with a different quality (hardness) of the measurement site having a change of the pressure pulse wave amplitude such that the envelope curve shape (change pattern shape of pressure pulse wave amplitude) becomes the same are measured, there is a difference in the measurement accuracy because the pressure pulse wave amplitude detected by the sphygmomanometer, that is, the envelope curve shape differs depending on the quality (hardness) of the measurement site.
  • Therefore, one or more embodiments of the present invention provides an electronic sphygmomanometer and a blood pressure measurement method for accurately acquiring the blood pressure value by correcting the blood pressure calculation parameter based on the information on the quality of the measurement site, thereby enhancing the satisfaction level of the user.
  • SUMMARY OF INVENTION
  • According to one or more embodiments of the present invention, an electronic sphygmomanometer includes a cuff to be attached to a blood pressure measurement site, pressurization and depressurization means for adjusting pressure to be applied on the cuff, pressure detection means for detecting pressure in the cuff, blood pressure calculating means for calculating a blood pressure value from the cuff pressure, recording means for recording the blood pressure value, operation means for carrying out operations such as blood pressure measurement, correcting means for correcting the blood pressure value calculated by the blood pressure calculating means based on separately acquired correction information; and information acquiring means for acquiring information on quality of the measurement site as the correction information; wherein when the information on the quality of the measurement site is acquired as the correction information by the information acquiring means, the correcting means corrects the blood pressure calculation parameter based on the information on the quality of the measurement site.
  • Therefore, an optimum blood pressure calculation parameter can be set for every quality of the measurement site according to the information on the quality of the measurement site, and the measurement error can be reduced.
  • Further, according to one or more embodiments of the invention, information on the quality of the measurement site may be information of body fat percentage, subcutaneous fat percentage, or BMI.
  • Further, one or more embodiments of the invention may further include display means for displaying the information on the quality of the measurement site applied when the correcting means corrects the blood pressure calculation parameter.
  • According to one or more embodiments of the present invention, there is provided a blood pressure measurement method for adjusting pressure to be applied to a cuff with pressurization and depressurization means when the cuff is attached to a blood pressure measurement site, and calculating a blood pressure value by blood pressure calculating means based on a cuff pressure detected by pressure detection means, the blood pressure measurement method including the step of: correcting the blood pressure value calculated by the blood pressure calculating means based on separately acquired correction information; wherein the step of correcting by the correcting means includes acquiring information on quality of the measurement site as the correction information by information acquiring means, and when the information on the quality of the measurement site is acquired as the correction information by the information acquiring means, correcting the blood pressure calculation parameter based on the information on the quality of the measurement site.
  • According to one or more embodiments of the present invention, a process of setting an optimum blood pressure calculation parameter for every quality of the measurement site of the user and reducing the measurement error can be executed.
  • According to one or more embodiments of the present invention, the electronic sphygmomanometer and the blood pressure measuring method for accurately acquiring the blood pressure value using the acquired data are provided, so that the satisfaction level of the user can be enhanced.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a block diagram showing a configuration of an electronic sphygmomanometer according to one or more embodiments of the present invention.
  • FIG. 2 is a flowchart showing a blood pressure measurement operation according to one or more embodiments of the present invention.
  • FIG. 3 is a table showing ratios for determining blood pressure calculation parameter for every body fat percentage.
  • FIG. 4 is a view showing a display example in the display unit.
  • FIG. 5 is a graph describing a blood pressure calculation algorithm of the oscillometric sphygmomanometer.
  • FIG. 6 is a graph showing an example of the properties of the cuff (cuff compliance).
  • DETAILED DESCRIPTION OF INVENTION
  • Embodiments of the present invention will be described below with reference to the drawings.
  • As shown in FIG. 1, an electronic sphygmomanometer 2500 according to one or more embodiments of the present invention includes a cuff 2101, an air tube 2102, a pressure sensor 2103, a pump 2104, a valve 2105, an oscillation circuit 2111, a pump drive circuit 2112, a valve drive circuit 2113, a timing unit 2115, a power supply 2116, a CPU 2120, a display unit 2121, a memory (for processing) 2122, a memory (for recording) 2123, an operation unit 2530, an interface 2171, and an external memory 2172.
  • FIG. 1 is a block diagram showing a configuration of the electronic sphygmomanometer 2500 according to one or more embodiments of the present invention.
  • The cuff 2101 is a band shaped member that is connected to the air tube 2102 and that is attached to a blood pressure measurement site of the user to pressurize by air pressure.
  • The pressure sensor 2103 is an electrostatic capacitance type pressure sensor, in which a capacitance value changes according to the pressure in the cuff (cuff pressure).
  • The pump 2104 and the valve 2105 apply pressure to the cuff and adjust (control) the pressure in the cuff.
  • The oscillation circuit 2111 outputs a signal of the frequency corresponding to the capacitance value of the pressure sensor 2103.
  • The pump drive circuit 2112 and the valve drive circuit 2113 drive the pump 2104 and the valve 2105, respectively.
  • The timing unit 2115 is a device for timing the current date and time, and transmitting the timed date and time to the CPU 2120 as necessary.
  • The power supply 2116 supplies power to each configuring unit.
  • The CPU 2120 executes the control of the pump 2104, the valve 2105, the display unit 2121, the memories 2122, 2123, the operation unit 2530, the interface 2171, the blood pressure determination process, and the management of the recording values.
  • The display unit 2121 is configured by a display device such as a liquid crystal screen, and displays a blood pressure value and user information, to be described later, according to a signal transmitted from the CPU 2120.
  • The memory (for processing) 2122 stores a ratio (to be described later) for determining a blood pressure calculation parameter and a control program of the sphygmomanometer.
  • The memory (for recording) 2123 stores the blood pressure value, and also stores the user information by association in addition to the date and time, the user, and the measurement value (blood pressure value etc.).
  • The operation unit 2530 includes a power supply switch 2131, a measurement switch 2132, a stop switch 2133, a record callout switch 2141, a user selection switch 2142, and a user information input switch 2543, permits the operation input such as power ON/OFF of the sphygmomanometer and the start of measurement, and transmits the input input signal to the CPU 2120.
  • The interface 2171 records/reads out the blood pressure to and from the external memory 2171 according to the control of the CPU 2120.
  • The user information input switch 2543 can input body fat percentage, subcutaneous fat percentage, BMI or the like for the information of the user, where the user information related to the quality (hardness) of the measurement site of the user can be acquired according to one or more embodiments of the present invention.
  • The blood pressure measurement operation using the electronic sphygmomanometer 2500 configured as above will be described according to the flowchart of FIG. 2.
  • FIG. 2 is a flowchart showing the blood pressure measurement operation according to one or more embodiments of the present invention.
  • First, when the power supply switch 2131 of the sphygmomanometer is pushed (step S2501), the CPU 2120 initializes the operation memory of the sphygmomanometer, and carries out 0 mmHg adjustment of the pressure sensor 2103 (step S2502).
  • When the information of the user (body fat percentage, subcutaneous fat percentage, BMI, etc.) is input (step S2503), the CPU 2120 determines a blood pressure calculation parameter most suited for the user information (step S2504).
  • The cuff 2101 is then wrapped around the measurement site of the user, and the measurement switch 2132 is pushed (step S2505), so that the CPU 2120 pressurizes the cuff pressure up to a predetermined pressure with the pump 2104 (steps S2506 to S2507), and gradually depressurizes the cuff pressure with the valve 2105 (step S2508).
  • The CPU 2120 extracts the pressure change component involved in the volume change of the artery superimposed on the cuff pressure obtained during the depressurization, and calculates the blood pressure through a predetermined calculation using the optimized blood pressure calculation parameter (step S2509).
  • After calculating the blood pressure value (step S2510: YES), the CPU 2120 opens the valve 2105 and exhausts the air in the cuff.
  • The CPU 2120 displays the calculated blood pressure value, the user information, and the like on the display unit 2121 (step S2511), and records the same in the memory (for recording) 2123 in association with the user information in addition to the measurement date and time, and the user (step S2512).
  • The optimization process of the blood pressure calculation parameter is carried out in the following manner in step S2504.
  • When, for example, the body fat percentage is input for the user information (step S2503), the CPU 2120 determines the ratios α, β corresponding to the range of the body fat percentage in which the input body fat percentage is input based on a table, in which the ratios α, β for determining the blood pressure calculation parameter are categorized for every value of the body fat percentage as shown in FIG. 3, recorded in the memories 2122, 2123, and determines the blood pressure calculation parameter obtained by multiplying the ratios α, β by a maximum value of the pressure pulse wave amplitudes as the optimum parameter.
  • Similarly for the subcutaneous fat percentage and the BMI, the CPU 2120 determines the blood pressure calculation parameter as the optimum parameter using the table (not shown) corresponding to the table shown in FIG. 3, in which the ratios α, β for determining the optimum parameter are categorized with respect to the body fat percentage.
  • The CPU 2120 determines the optimum parameter based on the user information input in step S2503 in this manner.
  • As the user information, the value recorded in an external recording medium (USB memory, etc.) or a personal computer, or a server through the Internet may be used, or the body fat meter or the like is connected to measure the body fat percentage for every blood pressure measurement, and thus, a measured value may be used.
  • According to one or more embodiments of the present invention, the body fat percentage is divided into a plurality of (e.g., four) sections for every predetermined range, and the ratio α for determining the systolic blood pressure calculation parameter and the ratio β for determining the diastolic blood pressure calculation parameter are set in advance for each section.
  • The ratio α is the largest and 52% in the section of smaller than or equal to 19.9%, and becomes smaller as the body fat percentage becomes greater (as the body type approaches the obese body type from the standard body type). The ratio α is the smallest and 46% in the section of greater than or equal to 35%.
  • The ratio β is the smallest and 68% in the section of smaller than or equal to 19.9%, and becomes greater as the body fat percentage becomes greater. The ratio β is the largest and 74% in the section of greater than or equal to 35%.
  • In step S2511, a display as shown in FIG. 4 is made on the display unit 2121. In the display 2121, a blood pressure display portion 2121 a, a body fat percentage section display portion 2121 b, and a date and time display portion 2121 c are set. The calculated blood pressure value is displayed in the blood pressure display portion 2121 a, the body fat percentage information of the user input in step S2503 is displayed in the body fat percentage section display portion 2121 b, and the current date and time timed by the timing unit 2115 is displayed in the date and time display portion 2121 c.
  • In the body fat percentage section display portion 2121 b, a list is displayed according to the body fat percentage section set in the table of FIG. 3. An input result display portion M (black triangular mark in the figure) is displayed at the side of the display site of the section to which the body fat percentage input in step S2503 belongs, so that which section the input body fat percentage, that is, the body fat percentage applied when setting the blood pressure calculation parameter in step S2504, belongs can be indicated. In FIG. 4, the input result display portion M is displayed at the side of the section of smaller than or equal to 19.9%, which indicates that the numerical value of smaller than or equal to the body fat percentage of 19.9% is input in step S2503.
  • However, the display method of the body fat percentage section display portion 2121 b is not necessarily limited thereto, and only the section to which the body fat percentage input in step S2503 belongs may be displayed.
  • As described above, an electronic sphygmomanometer 2500 includes biological information acquiring means for measuring a blood pressure value, recording means (memory 2123) for recording the blood pressure value, means (memory 2122) for storing ratios for determining the blood pressure calculation parameters and a control program of the sphygmomanometer, operation means (operation unit 2530) for performing operations such as blood pressure measurement, correcting means (CPU 2120) for correcting the biological information acquired by the biological information acquiring means based on the separately acquired correction information, and output means (display unit 2121) for outputting the corrected information (blood pressure value) after the correction, the biological information acquiring means including a cuff 2101 to be attached to a blood pressure measurement site, pressurization and depressurization means 2104, 2105 for adjusting the pressure to be applied to the cuff 2101, pressure detection means (pressure sensor 2103) for detecting the pressure in the cuff, and blood pressure calculation means (CPU 2120) for calculating the blood pressure value from the cuff pressure, the electronic sphygmomanometer further including information acquiring means (CPU 2120 that executes step S2503) for acquiring information on quality (hardness) of the measurement site of the user, where the correcting means (CPU 2120 that executes step S2504) is configured to correct the blood pressure calculation parameter based on the quality of the measurement site.
  • According to one or more embodiments of the present invention, the optimum blood pressure calculation parameter is set for every quality (hardness) of the measurement site of the user, so that the measurement error can be reduced.
  • The user information such as the body fat percentage, the subcutaneous fat percentage, and the BMI is an index indicating the quality (hardness) of the measurement site of the user, and the quality of the measurement site can be numerically converted by the body fat percentage, the subcutaneous fat percentage, and the BMI. Therefore, the correcting means (CPU 2120 that executes step s2504) can easily set the blood pressure calculation parameter based on the numerically converted information by acquiring various types of user information as the information related to the quality of the measurement site.
  • When the user information (information related to the quality of the measurement site of the user) is not appropriately input in step S2503, the blood pressure calculation parameter is not appropriately determined in step S2504. Thus, according to one or more embodiments of the present invention, the user information input before the start of the blood pressure measurement, that is, the user information applied when setting the blood pressure calculation parameter in step S2504, is displayed on the display means (display unit 2121), so that the user can check whether or not the user information is appropriately input, and the necessity to redo the blood pressure measurement can be easily recognized based on the display of the display unit 2121 when the input user information is not appropriate. Thus, the user is able to know the accurate blood pressure value.
  • Embodiments of the present invention are not limited only to the above-described embodiments, and a great number of embodiments can be realized.
  • For example, the electronic sphygmomanometer 2500 may be configured to download an appropriate parameter, threshold value, algorithm, or the like from a dedicated server to expand the function. In this case, the version of the software may be upgraded with the hardware as is, or optimization can be easily realized by the user.
  • The function expansion of the electronic sphygmomanometer 2500 may be executed from a user terminal such as a personal computer possessed by the user without using the server. In this case, the parameter, the threshold value, the algorithm, and the like may be downloaded from a recording medium such as a CD-ROM.
  • The electronic sphygmomanometer 2500 may be directly and communicably connected wirelessly or by wire to other biological information acquiring device such as a body composition meter, a pedometer, or an electronic thermometer. In this case as well, data may be mutually transmitted and received to enhance the individual accuracy.
  • Embodiments of the present invention can be used in an electronic sphygmomanometer adopting an oscillometric method that uses a cuff.
  • While the invention has been described with respect to a limited number of embodiments, those skilled in the art, having benefit of this disclosure, will appreciate that other embodiments can be devised which do not depart from the scope of the invention as disclosed herein. Accordingly, the scope of the invention should be limited only by the attached claims.
  • DESCRIPTION OF REFERENCE NUMERALS
    • 2500 electronic sphygmomanometer
    • 2101 cuff
    • 2103 pressure sensor
    • 2104 pump
    • 2105 valve
    • 2115 timing unit
    • 2120 CPU
    • 2121 display unit
    • 2122 memory (for processing)
    • 2123 memory (for recording)
    • 2530 operation unit
    • 2141 record callout switch, display unit
    • 2142 user selection switch
    • 2543 user information input switch

Claims (4)

1. An electronic sphygmomanometer comprising:
a cuff to be attached to a blood pressure measurement site;
pressurization and depressurization means for adjusting a pressure applied on the cuff;
pressure detection means for detecting the pressure in the cuff;
blood pressure calculating means for calculating a blood pressure value from the cuff pressure;
recording means for recording the blood pressure value;
operation means for carrying out a blood pressure measurement;
correcting means for correcting the blood pressure value calculated by the blood pressure calculating means based on a separately acquired correction information; and
information acquiring means for acquiring information on a quality of the measurement site as the correction information,
wherein when the information on the quality of the measurement site is acquired as the correction information by the information acquiring means, the correcting means corrects a blood pressure calculation parameter based on the information on the quality of the measurement site.
2. The electronic sphygmomanometer according to claim 1, wherein the information on the quality of the measurement site is information selected from the group consisting of body fat percentage, subcutaneous fat percentage, and BMI.
3. The electronic sphygmomanometer according to claim 1, further comprising display means for displaying the information on the quality of the measurement site applied when the correcting means corrects the blood pressure calculation parameter.
4. A blood pressure measurement method for adjusting a pressure to be applied to a cuff with pressurization and depressurization means when the cuff is attached to a blood pressure measurement site, and calculating a blood pressure value by blood pressure calculating means based on a cuff pressure detected by pressure detection means, the blood pressure measurement method comprising the step of:
correcting the blood pressure value calculated by the blood pressure calculating means based on a separately acquired correction information,
wherein the step of correcting by the correcting means comprises:
acquiring information on a quality of the measurement site as the correction information by information acquiring means; and
when the information on the quality of the measurement site is acquired as the correction information by the information acquiring means, correcting a blood pressure calculation parameter based on the information on the quality of the measurement site.
US13/169,181 2008-12-26 2011-06-27 Electronic sphygmomanometer and blood pressure measurement method Abandoned US20110251501A1 (en)

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JP2008333402 2008-12-26
JP2008-333402 2008-12-26
PCT/JP2009/007229 WO2010073690A1 (en) 2008-12-26 2009-12-25 Electronic sphygmomanometer, and method of measurement of blood pressure

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US13/149,440 Active US8707753B2 (en) 2008-12-26 2011-05-31 Weight measuring device
US13/155,773 Active 2031-01-13 US8818752B2 (en) 2008-12-26 2011-06-08 Biological information acquiring system and biological information acquiring method
US13/167,536 Abandoned US20110257540A1 (en) 2008-12-26 2011-06-23 Electronic sphygmomanometer and blood pressure measuring method
US13/168,364 Active 2030-09-28 US9377344B2 (en) 2008-12-26 2011-06-24 Electronic sphygmomanometer and blood pressure measurement method
US13/168,218 Abandoned US20110257538A1 (en) 2008-12-26 2011-06-24 Electronic sphygmomanometer and blood pressure measurement method
US13/168,774 Abandoned US20110257539A1 (en) 2008-12-26 2011-06-24 Electronic sphygmomanometer and blood pressure measurement method
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US13/155,773 Active 2031-01-13 US8818752B2 (en) 2008-12-26 2011-06-08 Biological information acquiring system and biological information acquiring method
US13/167,536 Abandoned US20110257540A1 (en) 2008-12-26 2011-06-23 Electronic sphygmomanometer and blood pressure measuring method
US13/168,364 Active 2030-09-28 US9377344B2 (en) 2008-12-26 2011-06-24 Electronic sphygmomanometer and blood pressure measurement method
US13/168,218 Abandoned US20110257538A1 (en) 2008-12-26 2011-06-24 Electronic sphygmomanometer and blood pressure measurement method
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