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WO1995000074A1 - Sphygmomanometre - Google Patents

Sphygmomanometre Download PDF

Info

Publication number
WO1995000074A1
WO1995000074A1 PCT/GB1994/001332 GB9401332W WO9500074A1 WO 1995000074 A1 WO1995000074 A1 WO 1995000074A1 GB 9401332 W GB9401332 W GB 9401332W WO 9500074 A1 WO9500074 A1 WO 9500074A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
artery
measuring
subject
movement
Prior art date
Application number
PCT/GB1994/001332
Other languages
English (en)
Inventor
Samuel Nathaniel Olalekan Akinyemi
Graham Keith Ablett
Original Assignee
Akinyemi Samuel Nathaniel Olal
Graham Keith Ablett
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Akinyemi Samuel Nathaniel Olal, Graham Keith Ablett filed Critical Akinyemi Samuel Nathaniel Olal
Priority to AU69769/94A priority Critical patent/AU6976994A/en
Publication of WO1995000074A1 publication Critical patent/WO1995000074A1/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
    • A61B8/04—Measuring blood pressure
    • 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 for evaluating the cardiovascular system, e.g. pulse, heart rate, blood pressure or blood flow
    • A61B5/021—Measuring pressure in heart or blood vessels
    • A61B5/022—Measuring pressure in heart or blood vessels by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers

Definitions

  • the present invention relates to blood pressure measuring apparatus and its method of use in the measurement of blood pressure variables of a subject.
  • a known blood pressure measuring apparatus uses an inflatable cuff connected to a manometer.
  • the cuff is wrapped around the arm of a subject and inflated sufficiently to occlude the blood flow in the main blood vessel of the arm.
  • the inflation pressure is then slowly released to identify when a pulse returns after occlusion.
  • the manometer readings indicate the systolic and diastolic blood pressures of the subject.
  • blood pressure measuring apparatus comprising:- movement sensing means for measuring movement of an artery in a subject; means for applying a pressure to the artery; and pressure sensing means capable of measuring the applied pressure according to changes in amplitude of pressure pulses derived from the artery.
  • artery can encompass blood carrying vessels which are pulsating.
  • the pressure sensing means measures the applied pressure at the maximum amplitude of pressure pulses derived from the artery.
  • the pressure sensor means may take any suitable form but in the preferred embodiments comprises a strain gauge arrangement, using for example a Wheatstone bridge arrangement. Alternatively the pressure sensor may comprise a hall effect sensor.
  • the movement sensing means preferably comprises a Doppler transmitter and receiver arrangement adapted to measure movement of an artery wall.
  • the apparatus preferably includes a marker located for assisting correct positioning of the movement sensor means relative to the artery.
  • the pressure applying means comprises a compressible vesicle having a surface for engaging the subject and a means for compressing the vesicle.
  • a method for determining blood pressure variables of a subject comprising the steps of:- a) measuring movement of an artery in a subject; b) applying a pressure to the artery; and c) measuring the applied pressure according to changes in amplitude of pressure pulses generated by the artery.
  • the maximum pressure fluctuation amplitude serves as a reference point at which values can be taken from the vessel sensor means and the pressure sensor for determining actual values of the systolic and diastolic blood pressures within the vessel from calibration factors.
  • Figure 1 shows schematic and part cross-sectional view of the main components of pressure reading apparatus according to a preferred embodiment of the invention
  • Figure 2 is a schematic view of a standard Doppler apparatus according to a preferred embodiment of the invention positioned in the proximity of a blood vessel;
  • Figure 3 shows a gr: ph illustrating the periodic movement of the wall of a pulsating artery
  • Figure 4 shows a graph of Pressure Fluctuation Amplitude against actual values of measured Pulse Pressure
  • Figure 5 shows a graph of Pressure Fluctuation Amplitude against Applied Pressure
  • Figure 6 shows a graph of Experimental Systolic/Diastolic Pressure against Applied Pressure.
  • Figure 1 shows a schematic view of a blood pressure measuring apparatus of one embodiment of the present invention.
  • the apparatus has a sensing portion 1 connected to an adjustable strap 11 so that the apparatus can be secured firmly to a wrist 7 of a subject whose blood pressure is to be measured.
  • the sensing portion 1 has a casing which includes a pressure applying portion in the form of a compressible vesicle 2 filled with fluid.
  • a plunger 3 is slidably received within the sensing portion casing and can be moved towards the vesicle by way of a rotatable handle 4 which is in threaded interengagement with the casing. As a result of rotation of the handle 4, the plunger can press against the vesicle to increase the pressure generated within the vesicle 2 that is transferred to an artery 6 in the wrist 7.
  • Sensors 5 and 5a located within the vesicle measure certain pressure variables within the vesicle as explained hereinafter.
  • a Doppler arrangement in the form of a transmitter 8 and receiver 9 are also located inside the vesicle for measuring pulsation movements of the wall of the artery 6 as shown in figure 2.
  • the casing of the sensing portion 1 has a marker 13 to assist correct positioning thereof over the artery 6.
  • a microprocessor 10 is connected to operate the ultrasound generator and to receives outputs from the receiver 9 and the sensors 5 and 5a and the values of the diastolic and systolic blood pressure are indicated on a display 12 provided on the surface of the casing.
  • Figure 3 illustrates a curve of pressure against time which can be detected using a known Doppler transmitter and receiver arrangement located above an artery in a wrist.
  • the correct position of the Doppler arrangement is obtained by palpating the wrist in a conventional manner.
  • ultrasound waves generally have a frequency of 5-10 MHz
  • the Doppler effect can be effectively used to measure movement of an arterial wall in pulsatile blood flow.
  • the Doppler arrangement can thus generate a plot of the artery wall movement against time. Since the artery wall movement is proportional to the pressure fluctuation with the artery, the plot gives a representation of the artery pressure fluctuation, i.e. between the systolic and diastolic pressures.
  • the amplitude of this curve represents the pulse pressure R which is the systolic pressure S minus the diastolic pressure D represented in units of the Doppler arrangement. It does not give the values of R in the normal units of millimetres of mercury (mm Hg) .
  • the Doppler arrangement is effectively used to define the rate of blood flow through an artery in terms of pulse pressure and heart rate. This flow is a representation of the cardiac output.
  • the wrist of a subject is palpated and the location of the artery is marked on the wrist. Then, the apparatus is strapped onto the wrist with the marker 13 located above artery location mark made.
  • the Doppler arrangement of transmitter 8 and receiver 9 are ideally positioned to sense movement of the artery wall 6.
  • the basis of the calibration using figure 4 is contained in software algorithms of the microprocessor 10. Furthermore, this calibration broadly takes into account variables between subjects, for example sex, nationality, weight, etc. It will be apparent that the basis of the calibration contained in the microprocessor can be more elaborate using various correction factors related to these variables which are empirically derived.
  • the Doppler arrangement is activated and the output from the receiver 9 is relayed to the microprocessor 10. The output from the receiver 9 is an indication of the pulse pressure R.
  • Pressure is then applied to the vesicle by rotating handle 4 so as to move the plunger 3 to compress the vesicle 2.
  • the pressure of the vesicle is transferred to the wrist and the amplitude of the pressure pulsation is monitored by pressure sensor 5a.
  • the general value of the pressure within the vesicle is monitored by the sensor 5.
  • the output from both sensors is relayed to the microprocessor 10 for processing.
  • the microprocessor 10 detects a maximum in the output of the sensor 5a and at this point the output of the pressure sensor 5 is stored. Assuming the apparatus has been calibrated for systolic pressure, this output is a representation of the systolic pressure S.
  • the apparatus is capable of considerable modification, the details of which will be readily apparent to a person skilled in the art.
  • a manual handle 4 is illustrated, this can be automated under the control of the microprocessor 10.
  • other arrangements of applying pressure to the vesicle 2 can be used.
  • sensors 5 and 5a are shown, they can be incorporated to be a single sensor detecting the general pressure within the vesicle as well as the amplitude of the pressure pulsation.
  • the sensors 5, 5a may take any suitable form, e.g., standard unbonded strain gauges or standard audio-frequency transformer (inductor or capacitor variety) or hrll effect devices.
  • the apparatus can also be arranged to detect other parameters on the basis of the outputs from receiver 9 and sensors 5 and 5a, for example pulse or the mean arterial blood pressure MAP, where

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biomedical Technology (AREA)
  • Molecular Biology (AREA)
  • Veterinary Medicine (AREA)
  • Physics & Mathematics (AREA)
  • Vascular Medicine (AREA)
  • Biophysics (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Public Health (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Cardiology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Ophthalmology & Optometry (AREA)
  • Physiology (AREA)
  • Hematology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Radiology & Medical Imaging (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)

Abstract

L'invention concerne un sphygmomanomètre qui permet de déterminer par exemple les pressions sanguines systolique et diastolique d'un sujet. L'appareil comprend un capteur de mouvement (8, 9) qui mesure le déplacement d'une artère (6) chez un sujet (7), un dispositif (2, 3, 4) qui comprime l'artère et un capteur de pression (5, 5a) pouvant mesurer la pression appliquée selon les changements d'amplitude du pouls mesurés sur l'artère.
PCT/GB1994/001332 1993-06-23 1994-06-21 Sphygmomanometre WO1995000074A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU69769/94A AU6976994A (en) 1993-06-23 1994-06-21 Blood pressure measuring apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB939312962A GB9312962D0 (en) 1993-06-23 1993-06-23 An indirect pulse pressure manometer
GB9312962.5 1993-06-23

Publications (1)

Publication Number Publication Date
WO1995000074A1 true WO1995000074A1 (fr) 1995-01-05

Family

ID=10737654

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1994/001332 WO1995000074A1 (fr) 1993-06-23 1994-06-21 Sphygmomanometre

Country Status (3)

Country Link
AU (1) AU6976994A (fr)
GB (1) GB9312962D0 (fr)
WO (1) WO1995000074A1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999063890A1 (fr) * 1998-06-12 1999-12-16 Children's Medical Center Corporation Mesure non invasive de la pression in vivo
WO2001000087A1 (fr) * 1999-06-29 2001-01-04 Tensys Medical, Inc. Methode et appareil de determination non effractive de pression arterielle
US6251080B1 (en) * 1999-05-13 2001-06-26 Del Mar Medical Systems, Llc Self contained ambulatory blood pressure cincture
WO2003007820A3 (fr) * 2001-07-18 2003-05-15 Cardiosonix Ltd Sonde de transducteur ultrasonore et dispositif de mesure l'utilisant
WO2003065878A2 (fr) 2002-02-05 2003-08-14 Tensys Medical, Inc. Procede et appareil de mesure non invasive de parametres hemodynamiques a l'aide de parametriques
US7048691B2 (en) 2000-03-23 2006-05-23 Tensys Medical, Inc. Method and apparatus for assessing hemodynamic parameters within the circulatory system of a living subject
CN103110431A (zh) * 2012-09-12 2013-05-22 中国科学院深圳先进技术研究院 无创连续血压测量装置与方法
US9247886B2 (en) 2004-10-07 2016-02-02 Tensys Medical, Inc. Compact apparatus and methods for non-invasively measuring hemodynamic parameters
EP3089660A4 (fr) * 2014-01-03 2017-08-09 William R. Fry Appareil et procédé de mesure de pression artérielle non invasive guidée par ultrasons
US10285598B2 (en) 2006-05-13 2019-05-14 United States Gtm Medical Devices Continuous positioning apparatus and methods
US10952675B2 (en) 2007-10-12 2021-03-23 Shangyi Medical Technology (Hangzhou) Co., Ltd Apparatus and methods for non-invasively measuring a patient's arterial blood pressure

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3527197A (en) * 1966-04-19 1970-09-08 Southwest Res Inst Indirect blood pressure measurement
US3885551A (en) * 1971-04-01 1975-05-27 Hoffmann La Roche Artifact rejection for blood pressure monitoring
DE3345739A1 (de) * 1983-12-17 1985-07-04 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., 8000 München Am handgelenk zu befestigendes geraet zur erfassung und anzeige von kreislaufparametern
EP0299827A1 (fr) * 1987-07-03 1989-01-18 Gérard Boutin Dispositif de mesure de la pression sanguine dans une artère superficielle
EP0456844A1 (fr) * 1990-01-19 1991-11-21 Nihon Kohden Corporation Appareil automatique pour mesurer la pression sanguine non-pénétrant
WO1992007508A1 (fr) * 1990-10-31 1992-05-14 Medwave, Inc. Procede et appareil non-invasifs et non-occlusifs destines a la surveillance de la pression arterielle

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3527197A (en) * 1966-04-19 1970-09-08 Southwest Res Inst Indirect blood pressure measurement
US3885551A (en) * 1971-04-01 1975-05-27 Hoffmann La Roche Artifact rejection for blood pressure monitoring
DE3345739A1 (de) * 1983-12-17 1985-07-04 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., 8000 München Am handgelenk zu befestigendes geraet zur erfassung und anzeige von kreislaufparametern
EP0299827A1 (fr) * 1987-07-03 1989-01-18 Gérard Boutin Dispositif de mesure de la pression sanguine dans une artère superficielle
EP0456844A1 (fr) * 1990-01-19 1991-11-21 Nihon Kohden Corporation Appareil automatique pour mesurer la pression sanguine non-pénétrant
WO1992007508A1 (fr) * 1990-10-31 1992-05-14 Medwave, Inc. Procede et appareil non-invasifs et non-occlusifs destines a la surveillance de la pression arterielle

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
N.SCLATER: "DOPPLER TRANCEIVER PUTS FINGER ON BLOOD PRESSURE", PRODUCT ENGINEERING, vol. 41, no. 1, January 1970 (1970-01-01), NEW YORK US, pages 109 *

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999063890A1 (fr) * 1998-06-12 1999-12-16 Children's Medical Center Corporation Mesure non invasive de la pression in vivo
US6086533A (en) * 1998-06-12 2000-07-11 Children's Medical Center Corporation Non-invasive in vivo pressure measurement
US6251080B1 (en) * 1999-05-13 2001-06-26 Del Mar Medical Systems, Llc Self contained ambulatory blood pressure cincture
WO2001000087A1 (fr) * 1999-06-29 2001-01-04 Tensys Medical, Inc. Methode et appareil de determination non effractive de pression arterielle
US6471655B1 (en) 1999-06-29 2002-10-29 Vitalwave Corporation Method and apparatus for the noninvasive determination of arterial blood pressure
US6514211B1 (en) 1999-06-29 2003-02-04 Tensys Medical, Inc. Method and apparatus for the noninvasive determination of arterial blood pressure
US7503896B2 (en) 1999-06-29 2009-03-17 Tensys Medical, Inc. Method and apparatus for the noninvasive assessment of hemodynamic parameters including blood vessel location
US7048691B2 (en) 2000-03-23 2006-05-23 Tensys Medical, Inc. Method and apparatus for assessing hemodynamic parameters within the circulatory system of a living subject
US8328727B2 (en) 2000-03-23 2012-12-11 Tensys Medical, Inc. Method and apparatus for assessing hemodynamic parameters within the circulatory system of a living subject
WO2003007820A3 (fr) * 2001-07-18 2003-05-15 Cardiosonix Ltd Sonde de transducteur ultrasonore et dispositif de mesure l'utilisant
WO2003065878A2 (fr) 2002-02-05 2003-08-14 Tensys Medical, Inc. Procede et appareil de mesure non invasive de parametres hemodynamiques a l'aide de parametriques
EP1478269A4 (fr) * 2002-02-05 2008-03-19 Tensys Medical Inc Procede et appareil de mesure non invasive de parametres hemodynamiques a l'aide de parametriques
US9814398B2 (en) 2002-02-05 2017-11-14 Tensys Medical, Inc. Method and apparatus for non-invasively measuring hemodynamic parameters using parametrics
US9247886B2 (en) 2004-10-07 2016-02-02 Tensys Medical, Inc. Compact apparatus and methods for non-invasively measuring hemodynamic parameters
US10285598B2 (en) 2006-05-13 2019-05-14 United States Gtm Medical Devices Continuous positioning apparatus and methods
US10952675B2 (en) 2007-10-12 2021-03-23 Shangyi Medical Technology (Hangzhou) Co., Ltd Apparatus and methods for non-invasively measuring a patient's arterial blood pressure
CN103110431A (zh) * 2012-09-12 2013-05-22 中国科学院深圳先进技术研究院 无创连续血压测量装置与方法
EP3089660A4 (fr) * 2014-01-03 2017-08-09 William R. Fry Appareil et procédé de mesure de pression artérielle non invasive guidée par ultrasons

Also Published As

Publication number Publication date
AU6976994A (en) 1995-01-17
GB9312962D0 (en) 1993-08-04

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