Comparison with Japan made Blood Pressure monitor

Technical comparison
Picture   Omron-Blood-pressure-monitor IDoctorcloud-Blood-pressure-monitor  
Type Common Electronic BP Monitor PulseWave BP Monitor
Brand Japan--*** (HBP-9020) SONKA (RBP-9000)
Working Principle Oscillometric, Statistic Induction PulseWave Invention,Real-time State of Blood Flow
WaveForm Waveform of Omron Blood pressure monitor Waveform of SONKA Blood pressure monitor
BPJudgment principle Compute SBP/DBP from the envelope of the oscillometric waveform Imitate the auscultatory method:
*upper airbag function as Pump bulb
*lower airbag function as Stethoscope to detect PulseWave
Application limitation Each individual manufacturer utilizes their proprietary algorithm for SBP/DBP.
Theory is far from reality for those who with irregular heartbeats
No limitation
Airbag 1 Airbag 2 Airbags
*1 for Pressure Signal Detection
*another 1 for PulseWave Signal Detection
Tube 1 Tube 2 Tubes: *1 for Pressure Signal Detection
            *another 1 for PulseWave Signal Detection
Sensor 1 Sensor 2 Sensors: *1 for Pressure Signal Detection
             *another 1 for PulseWave Signal Detection
Accuracy Blood pressure:±3mmHg Blood pressure:±2mmHg(±0.267KPa)
Pulse:±5% Pulse:±2%
Data storage No 100 sets
Communication RS-232C RS-232 / USB
Using Intruction board No Yes

Specifications of Blood Pressure monitor

Name Automatic Pulsewave Blood Pressure Monitor
Model No. RBP-7000
Measurement Range 0 ~270mmHg (0 ~36kPa)
Pulse rate 40 ~180/min
Accuracy of BP ± 2mmHg (±0.267kPa)
Accuracy of Pulse Rate ± 2%
Storage Capacity 100 sets
Power Supply AC 100-240V,50-60Hz,1.6-0.8A
Operating Temperature 41℉ ~ 104 ℉/ (5℃ ~ 40℃)
Relative Humidity 15% ~ 80%
Air Pressure 80kPa~106kPa
Storage Temperature -7.6℉ ~ 131℉/ (-20 ℃ ~ 55 ℃)
Relative Humidity ≤93%
Air Pressure 50kPa ~106kPa
Gross Weight 7.45kg
Packing Dimension 500mm(L)*355mm(W)*455mm(H)
Shock Protection Class II, Type B
Arim Circumstance 17~42cm
Communication USB*1 , RS-232*2, RJ-45*1
Test Ports Upper Bladder Test Port *1, Lower Bladder Test Port*1
Printer No
Elbow Button Yes, to adjust arm position
Horizontal 10° Adjustment No
Intelligent Awakening Yes

How does Pulse Wave Blood Pressure Monitor Measure?

  • Pulsewave BP imitates mercury BP Monitor.
  • But it’s better than mercury BP Monitor.
  • Because it has 2 airbags with 2 tubes and 2 sensors.
  • Upper airbag functions as a pump ,lower airbag functions as the Stethoscope to detect pulse wave.

The results come from physics and maths algorithm, not by human judgement via hearing and vision.

Seen right diagram to know how our Blood pressure monitor work differently. 

Pulse wave blood pressure monitor
* How to have Systolic Blood Pressure Value?

H1 : the 1st pulsewave amplitude
H2 : the 2nd pulsewave amplitude
Pss1 : the airbag pressure data of H1
Pss2 : the airbag pressure data of H2
Pss0 : the airbag pressure data when pulsewave amplitude is 0.

So, we can get below equation:
Therefore,Pss0 is the highest pressure (SBP)

How to have Systolic Blood Pressure Value

When start to measure with the pulsewave cuff, the upper airbag gets enough pressure to block the blood flow of the brachial artery, then it gradually released the pressure of upper airbag until the moment that the blood flow rushes into vessel (we call this moment as Pss0),at this moment, the pulse will generate an intensity wave,this wave compared with the airbag pressure wave,there will be a LINER DATA,we call Pss0 as the highest pressure,that is SYSTOLIC PRESSURE (SBP)

* How to have Diastolic Blood Pressure Value?
How to have Diastolic Blood Pressre Value

Psz1 & Psz2 & Psz3 & Psz4 : Separately stands for lower airbag pressure data (which also means the pulsewave pressure data) at each SBP points.
T1 & T2 & T3 & T4 : Separately stands for the TIME DELAY of pulsewave according to Psz1/2/3/4.
PszA & PszB : Separately stands for lower airbag pressure data when upper airbag pressure data is smaller than DBP data.
TA & TB : Separately stands for the matching time dalay
Psz0 stands for upper airbag pressure data at DBP point
T0 stands for the matching pulsewave time delay on this DBP point.

So, we get below equation:
(Psz1-Psz0)/(T1-T0)= (Psz2-Psz0)/(T2-T0)= (Psz3-Psz0)/(T3-T0)= (Psz4-Psz0)/(T4-T0)
Therefore, Psz0 is the lowest pressure (DBP)

When blood rushes into vessel,with the pressure released from the upper airbag, there is a time delay for blood flow from heart to brachial artery , and the moment when this time delay gradually approaches zero,it means the blood can flow freely without any external pressure,just flow by the heart beats pressure,this moment stands for the lowest blood pressure (DBP),we call it Psz0.

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