EP1824381A1 - Verfahren und vorrichtung zur nicht-invasiven detektion des blutflusses und davon abhängiger parameter in arterien, insbesondere der arteriellen wellenform und des blutdruckes - Google Patents

Verfahren und vorrichtung zur nicht-invasiven detektion des blutflusses und davon abhängiger parameter in arterien, insbesondere der arteriellen wellenform und des blutdruckes

Info

Publication number
EP1824381A1
EP1824381A1 EP05823027A EP05823027A EP1824381A1 EP 1824381 A1 EP1824381 A1 EP 1824381A1 EP 05823027 A EP05823027 A EP 05823027A EP 05823027 A EP05823027 A EP 05823027A EP 1824381 A1 EP1824381 A1 EP 1824381A1
Authority
EP
European Patent Office
Prior art keywords
force
contact point
sensor
pressure
blood flow
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP05823027A
Other languages
German (de)
English (en)
French (fr)
Inventor
Dirk Freund
Martin Giersiepen
Brigitte Harttmann
Ulrich Heck
Stefan Hollinger
Frank Kressmann
Gerrit Rönneberg
Fred Schnak
Dieter Wunder
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KAZ Europe SA
Original Assignee
Braun GmbH
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 Braun GmbH filed Critical Braun GmbH
Publication of EP1824381A1 publication Critical patent/EP1824381A1/de
Withdrawn legal-status Critical Current

Links

Classifications

    • 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

Definitions

  • the invention relates to a method for the non-invasive detection of the blood flow and dependent parameters in arteries, in particular the arterial waveform and the blood pressure.
  • the sensor is placed with at least one moldable contact point on a tissue surface substantially above an artery and the at least one contact point with a temporally variable and defined external force F (t) acted upon.
  • the invention relates to a device for non-invasive detection of blood flow and dependent parameters in arteries, in particular the arterial waveform and the blood pressure.
  • the detection is carried out with a sensor having at least one deformable contact point, which is acted upon by a time-variable and defined external force F (t).
  • the measurement of the blood pressure in the commonly used oscillometric measuring instruments is carried out by evaluating the amplitudes of the pressure oscillation in an air bubble.
  • a cuff is fixed with the bubble around the measuring point and increases the pressure on the artery.
  • the artery now pulsates against the pressure of the cuff.
  • the pulsations can be detected in the air bubble in the form of oscillations of the internal pressure.
  • From the characteristic envelope (pressure oscillation height as a function of cuff pressure), the mean arterial pressure (MAP), the systolic pressure (maximum vein pressure) and the diastolic pressure (minimum vein pressure) can be determined.
  • MAP mean arterial pressure
  • systolic pressure maximum vein pressure
  • minimum vein pressure minimum vein pressure
  • the pulse wave in the artery contains essential information about the circulatory system and the heart. These waveforms are predominantly clinically determined by inserting a catheter into the appropriate arteries. From the waveforms thus determined, the cardiologist derives physiological parameters of the cardiovascular system.
  • DE 69720274 T2 discloses a method and a device for measuring blood pressure on the basis of an evaluation of pulse wave information. So it is not applied here the oscillometric blood pressure measurement. In a disadvantageous way, however, the pressurization from the outside takes place on the sensor. On the one hand, this leads to a less accurate pressurization of the sensor as well as to a greater outlay on equipment.
  • the object of the invention is therefore to provide a method according to the preamble of patent claim 1 and a device according to claim 8, which allow a measurement of the blood flow and dependent parameters in arteries of non-trained medical staff, without causing adulteration the response of the artery to the applied force.
  • invention and advantageous effects are therefore to provide a method according to the preamble of patent claim 1 and a device according to claim 8, which allow a measurement of the blood flow and dependent parameters in arteries of non-trained medical staff, without causing adulteration the response of the artery to the applied force.
  • the object is achieved by a method having the features of claim 1.
  • the deformation of the at least one contact point is measured by the blood flow within the artery in response to the entry of the force F (t).
  • the force F (t) can advantageously be generated by means of pressure increase within the sensor. Such increases in pressure can be carried out without great expenditure on equipment, for example by means of a pump, with which a fluid absorbable within the sensor is pressurized. Also for the evaluation of the pressure is particularly well suited because it is coupled in a linear manner with the force across the surface of the at least one contact point.
  • the deformation of a plurality of contact points arranged in the form of an array or a matrix is measured.
  • the arrangement of multiple contact sites does not require accurate placement of the device on the tissue surface above an artery. It is perfectly sufficient if the reaction of the artery to the entry of the force F (t) is measured only at individual points of contact.
  • the force F (t) can be applied manually, for example via a spring mechanism, to the at least one contact point.
  • the force F (t) can also be applied to the contact point by an electric motor or pneumatically.
  • the deformation of the at least one contact point is advantageously determined via the curvature ⁇ (t).
  • the detection takes place on the upper arm, on the wrist or on a finger of the respective person.
  • an artery runs relatively close below the tissue surface, so that an easily detectable and intensive signal, which is particularly well suited for evaluation, is obtained.
  • the object is achieved by a device having the features of patent claim 8.
  • the sensor has a measuring device with which the deformation of the at least one contact point by the blood flow within the artery in response to the entry of the force F (t) can be determined.
  • the deformation of the tissue surface above the blood-perfused artery is transmitted directly to the at least one contact point.
  • the force transmitter is particularly advantageous to design the force transmitter as a pneumatic unit, for example as a fluid pump, whereby the internal pressure within the sensor chamber and thus the force acting on the contact point or contact points can be controlled.
  • the contact point is formed as a membrane.
  • membranes are thin and flexible, which ensures that only the force F (t) and the deformation of the tissue surface by the arterial pressure in response to the force F (t) is transferred to the membrane and the influence of transverse forces can be neglected.
  • the senor has a fillable with a fluid chamber, which is provided with a substantially rigid undeformable, the at least one deformable contact point having facing. Since the force can be transmitted selectively to the contact point or the membrane by means of the fluid, a defined measurable external force can be applied to the tissue above the artery and the reaction of the artery to this force can be measured.
  • the fluid adequately dampens the deformation of the contact point or of the membrane, so that an overshoot of the contact point or of the membrane does not occur or is negligible.
  • a plurality of contact points are provided in the form of an array or a matrix, to each of which a separate measuring device is assigned.
  • the handling of the device is further simplified, especially for medical untrained users.
  • the force is introduced into the tissue above the artery via at least one contact point and the reaction of the artery to this introduced force is measured. An exact positioning of the sensor is therefore not necessary.
  • each measuring device has a strain gauge, with which the deformation or curvature ⁇ (t) of the membrane in a simple manner, even spatially resolved, can be determined.
  • a force transmitter is provided for applying force.
  • the force transmitter can also be designed to measure the force F (t).
  • the force transmitter can be designed according to one embodiment of the invention as a mechanical, manually operated unit, with which the force F (t), for example via a manually operated spring mechanism, is generated.
  • the force transmitter can also be designed as an electromechanical, motor-operated unit.
  • the measuring device for force measurement as a pressure measuring device for measuring the fluid pressure within the chamber, which is linearly correlated with the force.
  • a particularly advantageous embodiment of the invention is that a holding element is provided, with which the device can be fixed, for example, on the wrist, on the upper arm or on a finger of the user to detect at a lying close to the tissue surface artery.
  • the single FIGURE shows an embodiment of a device according to the invention for the non-invasive detection of blood flow and dependent parameters in arteries in a cross-sectional representation.
  • the device has a sensor 1, which consists essentially of an undeformable, rigid chamber 2.
  • the device thus consists of a single-chamber sensor.
  • the chamber 2 is filled with a fluid 3 (gas or liquid) and has a rigid wall 4, which is provided with a non-rigid contact point 5.
  • the contact point 5 to be placed on the tissue surface 20 of the user is designed as a deformable, elastic membrane.
  • a strain gauge 10 is arranged, with which the curvature ⁇ (t), that is, the deformation of the membrane 12 can be determined. It is also possible with the aid of the strain gauge 10, the curvature ⁇ (t) with respect to the membrane 12 to determine spatially resolved.
  • an array or a matrix that is to say in particular a two-dimensional two-dimensional measuring field consisting of a multiplicity of strain gauges, is provided at the contact point of the sensor.
  • a two-dimensional two-dimensional measuring field consisting of a multiplicity of strain gauges
  • the membrane 12 For detecting the blood flow and the parameters dependent thereon, the membrane 12 is acted on by a force F (t).
  • F (t) On the basis of the reaction of the blood-perfused artery 18 to the force F (t), the desired conclusions can be drawn about the blood flow and the parameters dependent thereon.
  • a force transmitter 11 is provided.
  • the force transmitter is a fluid pump 7 with which a fluid 3 can be pumped into the chamber 2 (shown only schematically in the figure). Depending on the amount of fluid within the chamber 2, a different force results on the contact point 5 or the membrane 12.
  • a force measuring device 17 is provided.
  • the force measuring device is designed as a pressure measuring device.
  • the force generation can also be generated manually via a mechanical unit 13, for example a manually actuable spring mechanism.
  • a mechanical unit 13 for example a manually actuable spring mechanism.
  • Another alternative is to form the force transmitter 11 as an electromechanical motor-driven unit 14 or as a displacement unit, which then exerts a defined force on the rigid facing opposite to the deformable Bewandung with the contact point.
  • the part of the walling that directly adjoins the deformable section is likewise elastic, so that no rigid terminal edge is pressed into the tissue of the human measuring site.
  • the sensor 1 For non-invasive detection of the blood flow and dependent parameters in arteries 18, the sensor 1 is placed with its contact point 5 on the surface 20 of a tissue 19 such that the contact point lie substantially above an artery 18 comes.
  • the force transmitter 11 in the present case by means of the fluid pump 7, the pressure in the fluid chamber 2 and thus the force on the contact point 5 and the membrane 12 is increased.
  • This time-variable force F (t) is detected by means of the force-measuring device 17, in the present case of the pressure-measuring device 16.
  • the force F (t) acting on the membrane 12 is transmitted to the tissue surface 20 or to the tissue 19 and thus to the artery 18. Due to the pulsating blood flow within the artery 18, the artery 18 reacts to the introduced force F (t). This reaction acts as a counter force on the tissue 19 and thus on the tissue surface 20 and the membrane 12. Due to the reactions of the artery 18 to the introduced force F (t), the diaphragm 12 deforms, that is, its curvature ⁇ (t) changes with time. This curvature ⁇ (t) can be detected with the strain gauge 20.
  • curvature ⁇ (t) Due to the applied force F (t) and the response of the artery 18 to this, this time-lhe changed curvature ⁇ (t) is characteristic of the blood flow and dependent parameters in arteries, in particular the arterial waveform and derived therefrom cardiovascular parameters and blood pressure, so that these values can be derived from the curvature ⁇ (t) with the aid of a corresponding evaluation method and a corresponding evaluation device.
  • the device thus comprises a fluid-filled single-chamber sensor, wherein the determination of the external force in this case via a pressure transducer for measuring the internal applied fluid pressure in the chamber or a force transducer for determining the external applied force, wherein at the contact point between the skin tissue and the sensor, a deformable membrane is provided with adjacently arranged within the chamber curvature or strain gauges - which form a measuring field - and are provided for detecting the time-varying curvature or elongation of the membrane due to the arterial pulsation.

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Cardiology (AREA)
  • Engineering & Computer Science (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Physiology (AREA)
  • Biophysics (AREA)
  • Pathology (AREA)
  • Vascular Medicine (AREA)
  • Biomedical Technology (AREA)
  • Physics & Mathematics (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
EP05823027A 2004-12-20 2005-12-15 Verfahren und vorrichtung zur nicht-invasiven detektion des blutflusses und davon abhängiger parameter in arterien, insbesondere der arteriellen wellenform und des blutdruckes Withdrawn EP1824381A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004062435A DE102004062435A1 (de) 2004-12-20 2004-12-20 Verfahren und Vorrichtung zur nicht-invasiven Detektion des Blutflusses und davon abhängiger Parameter in Arterien, insbesondere der arteriellen Wellenform und des Blutdruckes
PCT/EP2005/013491 WO2006066793A1 (de) 2004-12-20 2005-12-15 Verfahren und vorrichtung zur nicht-invasiven detektion des blutflusses und davon abhängiger parameter in arterien, insbesondere der arteriellen wellenform und des blutdruckes

Publications (1)

Publication Number Publication Date
EP1824381A1 true EP1824381A1 (de) 2007-08-29

Family

ID=35952308

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05823027A Withdrawn EP1824381A1 (de) 2004-12-20 2005-12-15 Verfahren und vorrichtung zur nicht-invasiven detektion des blutflusses und davon abhängiger parameter in arterien, insbesondere der arteriellen wellenform und des blutdruckes

Country Status (6)

Country Link
US (1) US20090275845A1 (enrdf_load_stackoverflow)
EP (1) EP1824381A1 (enrdf_load_stackoverflow)
JP (1) JP2008523933A (enrdf_load_stackoverflow)
CN (1) CN101316551A (enrdf_load_stackoverflow)
DE (1) DE102004062435A1 (enrdf_load_stackoverflow)
WO (1) WO2006066793A1 (enrdf_load_stackoverflow)

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CN100560019C (zh) * 2007-01-26 2009-11-18 香港中文大学 脉搏波传输时间法测量动脉血压的初始校准装置
CN101156772B (zh) * 2007-06-25 2011-10-12 许建平 一种血压监测装置
JP5424380B2 (ja) * 2008-12-12 2014-02-26 学校法人日本大学 脈波測定装置
EP2524646B1 (en) * 2010-01-12 2020-09-02 Hemodinamics, S.A. De CV. System and method for the measurement of arterial pressure through the effects thereof
CN102342829A (zh) * 2010-07-31 2012-02-08 牛锋 血压测量仪器和测量方法
CN105392418B (zh) * 2014-03-28 2018-05-29 深圳市大富网络技术有限公司 一种血压检测装置及相关装置和通信系统
CN104757956A (zh) * 2015-03-26 2015-07-08 京东方科技集团股份有限公司 智能穿戴设备和测量体征的方法
TWI617288B (zh) * 2017-01-25 2018-03-11 美盛醫電股份有限公司 壓力感測器及血壓量測裝置

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Also Published As

Publication number Publication date
CN101316551A (zh) 2008-12-03
WO2006066793A1 (de) 2006-06-29
US20090275845A1 (en) 2009-11-05
DE102004062435A1 (de) 2006-06-29
JP2008523933A (ja) 2008-07-10

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