WO1997049331A1 - Sphygmomanometer - Google Patents
Sphygmomanometer Download PDFInfo
- Publication number
- WO1997049331A1 WO1997049331A1 PCT/JP1996/001750 JP9601750W WO9749331A1 WO 1997049331 A1 WO1997049331 A1 WO 1997049331A1 JP 9601750 W JP9601750 W JP 9601750W WO 9749331 A1 WO9749331 A1 WO 9749331A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- blood pressure
- point
- cuff
- determined
- pressure
- 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.)
- Ceased
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
- A61B5/022—Measuring pressure in heart or blood vessels by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers
- A61B5/0225—Measuring pressure in heart or blood vessels by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers the pressure being controlled by electric signals, e.g. derived from Korotkoff sounds
- A61B5/02255—Measuring pressure in heart or blood vessels by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers the pressure being controlled by electric signals, e.g. derived from Korotkoff sounds the pressure being controlled by plethysmographic signals, e.g. derived from optical sensors
Definitions
- the present invention relates to a sphygmomanometer, and more particularly to a non-invasive sphygmomanometer.
- a non-invasive electronic sphygmomanometer that winds a cuff that compresses an artery on the upper arm of a subject is known.
- Blood pressure determination methods of this type of sphygmomanometer include an oscillometric method, a Korotkoff sound method, Although there are impedance methods, etc., the oscillometric method is mainly used for clinical applications.
- a sphygmomanometer that employs such an oscillometric blood pressure determination method is disclosed, for example, in Japanese Patent Publication No. Hei 6-286637.
- the sphygmomanometer disclosed in this publication is attached to the upper arm of a subject and detects a cuff for injecting air and compressing an artery, and a superimposed pressure of a drop pressure and a pulse pressure that changes in the cuff. And a digital data processing unit for obtaining the maximum and minimum blood pressure values of the subject using the cuff pressure detection signal output by the measurement unit as an input signal. And a display section for displaying the highest and lowest blood pressure values calculated by the section.
- the digital data processing unit determines the maximum and minimum blood pressure from the change in the pulse wave amplitude of the pulse pressure oscillation.
- the method of determining blood pressure is represented by the intraarterial force catheter method.
- the ideal method is to capture a local area of the subject's artery and measure the lateral pressure of the blood vessel wall.
- a pressure change in the cuff wound around the subject's upper arm is detected and used for blood pressure determination. Pressure appeared or the determination of diastolic blood pressure was unclear.
- the conventional oscillometric blood pressure determination method detects the average pulsation of the artery passing through the cuff, and the pulsation is due to the arterial wall displacement of the brachial artery caused by the heartbeat. This is propagated as a displacement of the skin surface, and the displacement of the skin surface changes the air volume in the cuff, and this volume change is detected as a pressure change in the cuff. The displacement is converted into a pressure change in the cuff.
- the displacement of the arterial wall is measured using the air inside the cuff as a medium, and the pulse obtained from the inside of the cuff is affected by the extracorporeal effects of air compression and damping characteristics.
- the pressure waveform failed to accurately capture arterial wall displacement.
- a cuff is wound around a wide range of the brachial artery, which is the measurement site of the subject, and the pulse pressure wave vibration is detected by changing the pressure within the force pressure. Therefore, local dynamics, which are ideal for blood pressure determination, It does not accurately reflect the arterial pressure of the pulse wall, and therefore, a pulse pressure wave appears at a cuff pressure equal to or higher than the systolic blood pressure, and since the pulse pressure wave propagates with air as a medium, air The frequency propagation was affected by the compressibility and damping characteristics of the sound, which caused inconveniences such as impaired Korotkoff sound propagation.
- the present invention has been made in view of such conventional problems, and an object thereof is to enable accurate blood pressure determination by directly measuring a local displacement of an arterial wall. To provide a blood pressure monitor. Disclosure of the invention
- the present invention provides a cuff that is attached to a main part of a subject and injects air to compress an artery, an optical distance sensor that is installed opposite to the cuff and detects pulsation displacement of the artery.
- a digital data processing unit that determines the highest and lowest blood pressure of the subject based on the photoelectric volume pulse wave signal transmitted by the optical distance sensor; and a maximum and minimum blood pressure value determined by the digital data processing unit.
- the optical distance sensor may include a reflection plate provided inside the air bag of the cuff, and a light receiving and light emitting element provided outside the air bag.
- the optical distance sensor has a pair of light receiving and light emitting elements, and one of the elements is provided inside an air bag of the force, and the other of the elements is provided outside the air bag. Can be.
- the digital data processing unit when increasing or decreasing the pressure in the cuff at a constant speed, determines the disappearance or appearance point of the photoelectric volume pulse wave signal as the maximum blood pressure, and The point at which the wave signal decreases rapidly, or Can be determined as the diastolic blood pressure.
- the digital data processing section when increasing or decreasing the pressure in the cuff at a constant speed, determines the disappearance or appearance point of the photoelectric volume pulse wave signal as systolic blood pressure, and, The point where the Korotkoff sound component appears from the wave signal, or its vicinity, can be determined as the diastolic blood pressure.
- the digital data processing unit when increasing or decreasing the pressure in the cuff at a constant speed, determines the disappearance or appearance point of the photoelectric volume pulse wave signal as systolic blood pressure, and, The point where a flat portion appears in the pulse wave signal or its vicinity can be determined as the diastolic blood pressure.
- the blood pressure monitor has an optical distance sensor that is installed opposite to the cuff and detects a pulsation displacement of the artery. Since the diastolic blood pressure is determined by the digital data processing unit, the amount of local arterial wall displacement can be directly measured, and the highest and lowest blood pressure values can be obtained based on this amount of displacement.
- FIG. 1 is a block diagram showing an overall configuration of an embodiment of a sphygmomanometer according to the present invention
- FIG. 2 is a development view and a cross-sectional view of a main part of the cuff of the sphygmomanometer of FIG. 1
- FIG. Fig. 4 is a flowchart showing an example of a processing procedure for measuring blood pressure
- Fig. 4 is a waveform diagram showing an example of a pulse wave detected by the sphygmomanometer of Fig. 1
- Fig. 5 is a minimum diagram of the sphygmomanometer of Fig. 1.
- FIG. 6 is a waveform diagram showing another example when determining blood pressure
- FIG. 6 is a waveform diagram showing another example when determining blood pressure
- FIG. 6 is a waveform diagram showing another example when determining the minimum blood pressure with the sphygmomanometer of FIG. 1
- FIG. 9 is a waveform chart showing another example when determining the diastolic blood pressure.
- FIG. 1 to 4 show one embodiment of a sphygmomanometer according to the present invention.
- the sphygmomanometer shown in the figure has a cuff 10, an optical distance sensor 12, and a digital data processing unit 14.
- the cuff 10 is attached to the main part of the subject, specifically, the upper arm 16, and the details are shown in FIG.
- the cuff 10 shown in the figure is formed by bending a thin synthetic resin into an arc shape, and is capable of bending and deforming a hard curved plate 1 Oa, and an outer cloth 10 b surrounding the outer periphery of the curved plate 10 a, An inner cloth 10c sewn to the outer cloth 10b so as to surround the inner periphery of the curved plate 10a, and an air bag 10d provided on the inner surface side of the inner cloth 10c. And a fastening fastener 10Oe sewn on the outer periphery of the evening cloth 10Ob to lock the end of the inner cloth 10Oc.
- the air bag 10d is composed of a sealed transparent synthetic resin sheet bag 10g in which reinforcing fibers 10f are incorporated in a lattice shape.
- the reinforcing fiber 10 f is integrated into the bag 1 Og.
- the bag 1 O g can be inflated in proportion to the amount of air injected.
- an air injection pipe 18 is connected in communication.
- a pressure sensor 20 and an electromagnetic control valve 22 are connected to an outer end of the pipe 18.
- a pump 24 for sending air is connected to the electromagnetic control valve 22, and the electromagnetic control valve 22 and the pump 24 are controlled by a pump control unit 26.
- the detection signal of the pressure sensor 20 is determined by the bandpass filter 28 and the AZD converter 3 0 is input to the digital data processing unit 14 via 0.
- a control signal is sent from the digital data processing unit 14 to the pump control unit 26 based on the detection signal of the pressure sensor 20.
- the optical distance sensor 12 includes a photocabra 12 a fixed to the outer surface of the outer portion of the bag 10 g, and an outer surface of the inner portion of the bag 10 g facing the photocabra 12 a. And a reflection plate 12b fixed to the base plate.
- the photomask 12a is a combination of a light emitting diode and a phototransistor, and the light emitted from the light emitting diode is reflected by the reflector 12b and enters the phototransistor.
- the magnitude of the output of the phototransistor differs according to the distance between the photomask 12a and the reflector 12b, and an output signal corresponding to the displacement of the artery is transmitted.
- the on / off state of the light emitting diode of the photomask 12 a is controlled by a light emitting control unit 32 connected to the digital data processing unit 14.
- a digital data processing unit 14 is connected to the phototransistor 12a via a photo bus filter 34 and an AZD converter 36, so that the transistor detection signal is digitized. Input to the processing unit 14.
- the bag 10 g is formed of a transparent synthetic resin sheet
- the photocobra 12 a and the reflection plate 12 b are arranged on the outer surface thereof.
- the photokabura i 2 a and the reflection plate 12 b may be arranged on the inner surface side.
- the optical distance sensor 12 can employ not only the combination of the photocab 12a and the reflector 12b but also the combination of the light emitting diode and the phototransistor.
- the bag may be placed on the inner and outer surfaces of 1 Og so that they face each other.
- the digital data processing section 14 is composed of a so-called microcomputer and includes a CPU and a memory.
- the digital data processing section 14 has a display for displaying the maximum and minimum blood pressure values. Units 38 are connected via the interface.
- FIG. 3 shows an example of a processing procedure in the blood pressure measurement performed by the digital data processing unit 14.
- the cuff 10 When measuring blood pressure, first, the cuff 10 is attached to the upper arm 16 of the subject. At this time, it is set so that the reflector 12b is positioned on the artery of the upper arm 16, and the cloths 10b and 10c are hung and fixed to the locking fastener 10e.
- the reflector 12b in order to reliably position the reflector 12b on the artery of the upper arm 16 of the subject, for example, as shown by phantom lines in FIG. It is desirable to dispose them along the circumferential direction. With such a configuration, the reflector 12 b of any of the sensors 12 can be located on the artery.
- the output value of each sensor 12 may be compared and the one that outputs the largest output signal may be selected.
- step s1 When the mounting of the cuff 10 is completed, the preparation for the blood pressure measurement is completed, so that the control procedure of the digital data processing section 14 is started, and first, initial setting is performed in step s1.
- the initial settings include the upper limit of the pressure applied to the cuff 10 and the limit of the measurement time.
- step s2 calibration of the pressure sensor 20 is performed in step s2, and in step s3, an output signal is sent to the electromagnetic control unit 22 to open the electromagnetic control valve 22. Let it.
- step s4 constant-speed pressure control for controlling the electromagnetic control valve 22 based on the detection signal of the pressure sensor 20 to increase the pressure in the air bag 10d of the cuff 10 at a constant speed is performed. Done.
- the air bag 1001 has a lattice shape in the bag 1 Og.
- the reinforcing fiber 10 f is incorporated into the bag, and a hard curved plate 10 a is interposed on the outer peripheral side of the bag 1 O d, so that the expansion and contraction of the bag 10 d itself is performed by the reinforcing fiber 10 f.
- the outward expansion of the bag 10d is restricted by the curved plate 10a, and the displacement of the optical distance sensor 12 is prevented.As a result, the outer position of the bag 1 Od is fixed. It is possible to squeeze the artery while keeping it
- step s5 the flag i indicating the number of arterial waves is set to 0, the blood pressure determination flag FP is also set to 0, and the output signal of the optical distance sensor 12 is fetched.
- step s6 it is determined whether or not the photoelectric volume pulse signal has been detected.
- the photoplethysmographic signal determined here is a signal as shown in FIG. 4, and is obtained from the output signal of the optical distance sensor 12 based on the inflation of the air bag 1 Od pressurized at a constant speed. The corresponding part is removed, and the part corresponding to one beat of pulsation is individually extracted and stored in the memory.
- step s6 If it is determined in step s6 that no photoplethysmographic signal has been detected, the process proceeds to step s7.If it is determined in step s7 that the flag i force is not greater than 1, Return to step s6. In this case, if it is determined that the plethysmogram is not detected in step s6 for the first time, the flag i is set to 0 in step s5, so be sure to return to step s6. become. When it is determined in step s6 that the photoelectric volume pulse wave signal has been detected, it is determined whether or not the photoelectric volume pulse wave signal for one beat detected in step s8 has a flat portion. If not, return to step s6 and repeat the same procedure.
- step s10 it is determined whether the flag i is 1 or not. When this is 1, the determination of the diastolic blood pressure is executed in step s11. Then, when it is determined in step s10 that the flag i is not 1, and when the determination of the diastolic blood pressure is completed in step s11, the process returns to step s6.
- Step s 6 It is determined whether or not there is a flat portion s in each of the photoplethysmographic signals P 2 , P 3 ... P n detected in.
- the photoelectric volume pulse signal is pulsating without being affected by the pressure of the bag 1 0 d (photoelectric volume pulse signal in FIG. 4 ⁇ ⁇ ).
- the diastolic blood pressure determination in Step s 1 for example, to a first diastolic blood pressure the pressure in air bag 1 O d at which the flat portion s is photoelectric volume pulse signal P 7 expressed extracted, or The pressure in the air bladder 1 Od at the time when the photoplethysmographic signal P 6 immediately before the photoplethysmographic signal P 7 in which the flat portion s first appeared is used as the diastolic blood pressure value, Furthermore, the photoelectric volume pulse signal P 7 and the photoelectric Can be a diastolic blood pressure value the average value of the pressure in the volume pulse signal P 6 is the air bag 1 within 0 d timepoint extracted.
- the photoelectric volume pulse wave signal corresponds to the Korotkoff sound. Since the high-speed displacement portion K appears, the photoplethysmogram signal in which the high-speed displacement portion K first appears is detected in step s8, and the diastolic blood pressure value is obtained in step s11 by the method described above. Can also. Further, both the flat portion s and the high-speed displacement portion K can be detected, and the diastolic blood pressure value can be similarly obtained.
- step s6 After the determination of the diastolic blood pressure is performed and the value is specified as described above, even if there is a flat portion s in the photoelectric volume pulse wave signal, the flag i is 1 in step s10. Therefore, the processing steps from step s6 to s10 are sequentially executed. Then, if it is determined in step s6 that the photoelectric volume pulse signal is not detected, step s7 is executed again.
- step s7 since the processing procedure from step s6 to s10 has already been repeated a plurality of times, the flag i is always larger than 1 and, therefore, Step s1 2 is performed.
- step s12 the systolic blood pressure is determined.
- the pulsation of the artery is suppressed by the pressure. Focusing on the fact that no displacement occurs in the optical distance sensor 12, the point in time when the photoplethysmographic signal is no longer detected is determined as the subject's systolic blood pressure.
- step s 1 2 the systolic blood pressure is determined.
- step s13 the measurement result is displayed on the display section 38.
- the electromagnetic control valve 22 is opened to the atmosphere in step s15, and the air bag is opened. The air in 10 d is quickly exhausted, and the procedure ends.
- step s18 when the constant-speed pressurization of the air bag 1 Od is started in step s4 separately from the above procedure, in step s18, the pressure in the air bag 10d becomes higher than the initially set upper limit. It is always determined whether or not it is larger. At the same time as this determination, it is also determined in step s 19 whether or not the measurement time limit has been reached. If it is determined that any of these has exceeded the limit, the display section 3 8 displays that fact in step s 20. Is displayed, and the flow proceeds to step s14 to stop the measurement.
- the sphygmomanometer has an optical distance sensor 12 that is installed to face the air bag 1 Od of the cuff 10 and detects pulsation displacement of the artery, Based on the photoplethysmographic signal sent from the optical distance sensor 12, the subject's maximum and minimum blood pressures are determined by the digital data processing unit 14. Therefore, the local displacement of the arterial wall is directly measured, The maximum and minimum blood pressure values can be obtained based on this displacement amount, and accurate blood pressure values can be measured.
- FIG. 5 shows another example of a method for determining a diastolic blood pressure that can be employed in the sphygmomanometer according to the present invention.
- the photoplethysmogram signal obtained by the optical distance sensor 12 is differentiated, and the minimum blood pressure is determined based on the differentiated photoplethysmogram signal.
- the waveform shown in the upper part is the photoplethysmogram signal, and the waveform shown in the lower part is its differential waveform.
- the portion that is changing at high speed that is, the portion corresponding to the Korotkoff sound K ′ is emphasized, and as shown in the right end of FIG. 5, It appears as a big change. Therefore, in this example, the lowest blood level in the area where Korotkoff sound 1 first appeared or in the vicinity of it Judge as pressure. According to such determination of the diastolic blood pressure, a portion corresponding to the Korotkoff sound K 'can be accurately recognized, so that a more accurate determination of the diastolic blood pressure can be performed.
- FIG. 6 and 7 show still another example of a method for determining a diastolic blood pressure that can be employed in the sphygmomanometer according to the present invention.
- each peak value of the photoplethysmogram signal obtained by the optical distance sensor 12 is obtained, and before and after the obtained peak value are compared.
- the rise of the photoplethysmographic signal having the peak value is determined as the diastolic blood pressure.
- the magnitudes of the photoplethysmogram signals obtained by the optical distance sensors 12 and 12 are obtained, and the obtained amplitudes are compared to determine the maximum amplitude part. Then, the rise of the photoelectric volume pulse wave signal having the maximum amplitude is determined as the diastolic blood pressure.
- the diastolic blood pressure was employed in the conventional oscillometric method, but in the sphygmomanometer according to the present invention, the local displacement of the arterial wall is directly measured by the optical distance sensor 12. Since the maximum and minimum blood pressure values are obtained based on the displacement amount, the accuracy of determining the minimum blood pressure can be further improved.
- the systolic blood pressure is defined as the systolic blood pressure when the photoelectric volume pulse wave appears. Judge it.
- the local amount of displacement of the arterial wall is directly measured by the optical distance sensor, and based on the amount of displacement, the maximum and minimum blood pressures are determined. Since the value is determined, it is suitable for non-invasive sphygmomanometers that can determine highly accurate maximum and minimum blood pressure values.
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- Health & Medical Sciences (AREA)
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- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
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- Biophysics (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Ophthalmology & Optometry (AREA)
- Physics & Mathematics (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
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Description
Claims
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09330095A JP3534887B2 (ja) | 1995-04-19 | 1995-04-19 | 血圧計 |
| US08/983,144 US6106478A (en) | 1995-04-19 | 1996-06-25 | Sphygmomanometer utilizing optically detected arterial pulsation displacement |
| PCT/JP1996/001750 WO1997049331A1 (en) | 1995-04-19 | 1996-06-25 | Sphygmomanometer |
| EP96918899A EP0847724A4 (en) | 1995-04-19 | 1996-06-25 | SPHYGMOMANOMETER |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09330095A JP3534887B2 (ja) | 1995-04-19 | 1995-04-19 | 血圧計 |
| PCT/JP1996/001750 WO1997049331A1 (en) | 1995-04-19 | 1996-06-25 | Sphygmomanometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1997049331A1 true WO1997049331A1 (en) | 1997-12-31 |
Family
ID=26434703
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP1996/001750 Ceased WO1997049331A1 (en) | 1995-04-19 | 1996-06-25 | Sphygmomanometer |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US6106478A (ja) |
| EP (1) | EP0847724A4 (ja) |
| JP (1) | JP3534887B2 (ja) |
| WO (1) | WO1997049331A1 (ja) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19981621B3 (de) * | 1998-07-17 | 2013-02-28 | Citizen Holdings Co., Ltd. | Elektronisches Sphygmomanometer und Verfahren zum Messen eines Blutdrucks |
| US6533729B1 (en) * | 2000-05-10 | 2003-03-18 | Motorola Inc. | Optical noninvasive blood pressure sensor and method |
| JP3429488B2 (ja) * | 2000-10-30 | 2003-07-22 | 日本コーリン株式会社 | 自動血圧測定装置 |
| JP2002172095A (ja) * | 2000-12-06 | 2002-06-18 | K & S:Kk | 脈波測定装置 |
| ATE369787T1 (de) | 2001-06-20 | 2007-09-15 | Purdue Research Foundation | Druckmanschette mit körperbeleuchtung zur verwendung bei der optischen nichtinvasiven messung von blutparametern |
| AU2003217263A1 (en) * | 2002-01-29 | 2003-09-02 | Empirical Technologies Corporation | Blood pressure determination from pulse time delays |
| US7381187B2 (en) | 2003-09-12 | 2008-06-03 | Textronics, Inc. | Blood pressure monitoring system and method of having an extended optical range |
| US7164938B2 (en) * | 2004-06-21 | 2007-01-16 | Purdue Research Foundation | Optical noninvasive vital sign monitor |
| US20080071180A1 (en) * | 2006-05-24 | 2008-03-20 | Tarilian Laser Technologies, Limited | Vital Sign Detection Method and Measurement Device |
| JP4552919B2 (ja) * | 2006-10-05 | 2010-09-29 | オムロンヘルスケア株式会社 | 血圧計用カフおよび血圧計 |
| CN102519500B (zh) | 2007-01-31 | 2015-08-12 | 泰瑞连激光技术有限公司 | 光功率调制 |
| US20090036759A1 (en) * | 2007-08-01 | 2009-02-05 | Ault Timothy E | Collapsible noninvasive analyzer method and apparatus |
| JP5146997B2 (ja) * | 2007-10-25 | 2013-02-20 | テルモ株式会社 | 電子血圧計及びその信号処理方法 |
| US20100094141A1 (en) * | 2008-10-14 | 2010-04-15 | Amal Lesly Puswella | Jugular venous pressure ruler |
| JP5732692B2 (ja) * | 2010-08-02 | 2015-06-10 | セイコーエプソン株式会社 | 血圧検出装置及び血圧検出方法 |
| WO2021258049A1 (en) * | 2020-06-19 | 2021-12-23 | Mgi, Llc | Optical ankle-brachial index and blood pressure measurement system and method |
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| JPS6060833A (ja) * | 1983-09-14 | 1985-04-08 | 松下電工株式会社 | 血圧計 |
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| JPH05329113A (ja) * | 1992-06-03 | 1993-12-14 | Terumo Corp | 電子血圧計 |
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| US4170226A (en) * | 1977-07-27 | 1979-10-09 | Bolivar Albainy | Digital sphygmomanometer |
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| DE3612532A1 (de) * | 1985-04-12 | 1986-10-23 | Omron Tateisi Electronics Co., Kyoto | Elektronisches blutdruckmessgeraet |
| US4860761A (en) * | 1985-04-12 | 1989-08-29 | Omron Tateisi Electronics Co. | Pulse wave detecting apparatus for blood pressure measurement |
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| JPH0763450B2 (ja) * | 1989-10-31 | 1995-07-12 | テルモ株式会社 | 光電容積脈波血圧計 |
| US5425372A (en) * | 1990-04-13 | 1995-06-20 | Takeda Engineering Consultant, Inc. | Blood pressure measurement apparatus and associated method |
| JPH0535104A (ja) * | 1991-08-02 | 1993-02-12 | Canon Inc | トナー濃度制御方法 |
| US5261412A (en) * | 1992-11-20 | 1993-11-16 | Ivac Corporation | Method of continuously monitoring blood pressure |
| US5485838A (en) * | 1992-12-07 | 1996-01-23 | Nihon Kohden Corporation | Non-invasive blood pressure measurement device |
| US5840037A (en) * | 1995-04-19 | 1998-11-24 | A & D Company, Limited | Sphygmomanometer |
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1995
- 1995-04-19 JP JP09330095A patent/JP3534887B2/ja not_active Expired - Fee Related
-
1996
- 1996-06-25 WO PCT/JP1996/001750 patent/WO1997049331A1/ja not_active Ceased
- 1996-06-25 US US08/983,144 patent/US6106478A/en not_active Expired - Lifetime
- 1996-06-25 EP EP96918899A patent/EP0847724A4/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6060833A (ja) * | 1983-09-14 | 1985-04-08 | 松下電工株式会社 | 血圧計 |
| JPH0231734A (ja) * | 1988-07-22 | 1990-02-01 | Koorin Denshi Kk | 圧脈波検出装置 |
| JPH0535104U (ja) * | 1991-10-16 | 1993-05-14 | テルモ株式会社 | 光電容積脈波血圧計 |
| JPH05329113A (ja) * | 1992-06-03 | 1993-12-14 | Terumo Corp | 電子血圧計 |
Non-Patent Citations (1)
| Title |
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| See also references of EP0847724A4 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0847724A4 (en) | 2000-12-06 |
| US6106478A (en) | 2000-08-22 |
| EP0847724A1 (en) | 1998-06-17 |
| JP3534887B2 (ja) | 2004-06-07 |
| JPH08280642A (ja) | 1996-10-29 |
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