Omron HBP-1300 - Инструкция по эксплуатации - Страница 20

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Non-Invasive Blood Pressure (NIBP) Measurement

Non-Invasive Pressure Measurement Principles

Oscillometric method

The beat in the pulsation generated by the contraction of the heart is captured as the pressure inside 

the cuff to measure the blood pressure. If the cuff wrapped around the upper arm is pressurized 

sufficiently, the blood flow stops, but the beat of the pulsation is present and the pressure inside the cuff 

receives this and oscillates. Next, as the pressure inside the cuff gradually decreases, the oscillation of 

the pressure within the cuff gradually increases and reaches a peak. As the pressure within the cuff 

decreases further, the oscillation decreases from its peak.

The pressure within the cuff and the relationship with the increase and decrease of the oscillation within 

the cuff in this series of processes are stored into memory, calculations are carried out, and the blood 

pressure value is determined.

The pressure within the cuff when the oscillation increases drastically is the systolic pressure and the 

pressure within the cuff when the oscillation decreases drastically is the diastolic pressure. Also, the 

pressure within the cuff when the oscillation peaks is taken as the average pulsation pressure.

The oscillometric method does not determine the blood pressure value instantly like a microphone type 

automatic blood pressure gauge with the auscultation method, but rather determines it from the series 

of change curves as explained above. Therefore, it is not easily affected by external noise, an electric 

scalpel or other electro surgical instruments.

KOROTKOV SOUNDS

RADIAL PULSE

5 SEC

OSCILLATIONS IN CUFF PRESSURE

CUFF 

PRESSURE

Comparison between the auscultatory, oscillometric and 

palpatory methods of measuring blood pressure.

L.A. Geddes,

“The Direct and Indirect Measurement of Blood Pressure”, Year Book Medical Publishers, Inc. 1970

HBP-1300-E main.book  Page 18  Thursday, February 11, 2016  11:39 AM