M3001-66417 M3001A Patient Monitor Parts Module Non - Invasive Blood Pressure NBP Board

M3001-66417 Philipilip MP Series M3001A Module Non-Invasive Blood Pressure NBP Board

Non-invasive blood pressure measurement (NBP)

Description

The measurement server has a non-invasive blood pressure measurement for the monitoring device. It is designed for use in adult, pediatric, or neonatal patients in ICU and OR settings.

Measurements

It measures numbers that produce systolic, diastolic, and average blood pressure values. There are no waves associated with this measurement. Three different methods can be used to obtain measurement values, as follows:

• Manual - For each request, a systolic, diastolic, and average pressure measurement is taken.

• Auto: repeats the measurement of three values ​​at user-specified intervals.

• Statistics - Measure three values ​​immediately and repeatedly within five minutes. This method uses a faster measurement procedure, but produces less accurate readings.

NBP Features

This figure shows the user controls and connectors used for measurement. The parts are described in the paragraPhilipilip that follows the illustration.

The measurement offers adult, pediatric, and neonatal modes.

The following table lists the cuff inflation limits for each mode:

The following table lists the measurement ranges for each mode

Safety

The following table lists the maximum limits that ensure patient safety:

NBP measurement characteristics

Theory of Operation

When the NBP signals are transmitted from the patient to the monitor, they will go through the stages corresponding to the logic part of the circuit, as shown in the block diagram. Circuit-related faults can usually be isolated in one of the stages

1.Acquisition: the pressure sensor receives the signal from the patient through the cuff and the cuff connects to the circuit through a single tube. The cuff is inflated, deflated and monitored by a safety system controlled by a pump, a deflation system and a microprocessor.

A. Cuff inflation - During initial cuff inflation, the pressure pump inflates the cuff to a set pressure determined by the size of the patient. The pressure pump then inflates the cuff to a cuff pressure higher than the patient's systolic pressure. Depending on the measurement method used, the swelling will occur one or more times. When the cuff pressure is greater than the systolic pressure, the artery becomes occluded; then the pressure sensor only detects the cuff pressure.

B.Cuff deflation - Cuff pressure is gradually and automatically released by the deflation system until the artery is only partially occluded. At this point, as the cuff pressure is gradually released, the measurement and processing of blood pressure swings begin and continue.

2.Detection: blood pressure swing is superimposed on cuff pressure. They are drawn from the cuff pressure through a digital bandpass filter in the microcontroller.

3.Measurement: As the cuff deflates, the amplitude of the oscillation as a function of the cuff pressure increases until the mean arterial pressure is reached. When the cuff pressure is less than the mean arterial pressure, the amplitude of oscillation begins to decrease. The systolic and diastolic blood pressure values ​​are derived from the oscillometric signal by extrapolation. Results can be expected to differ from the standard stethoscope method. NBP accuracy conforms to AAMI SP-10