Vitalcare 506DN3, Service Manual

Page: 15 / 254

Criticare Systems, Inc. VitalCare
TM
506N3 Series Service Manual Page 1-3
Section 1 —Introduction
Non-Invasive Blood
Pressure (NIBP)
The 506N3 Series monitor uses ComfortCuff
™
technology to
determine non-invasive blood pressure by means of oscillometry. The
oscillometric method detects volume displacements within the artery
and senses pressure variations within the blood pressure cuff during
inflation. The monitor uses cuffs ranging in size from neonate cuffs to
adult thigh cuffs.
Comfort Cuff Technology
ComfortCuff technology measures NIBP while the cuff inflates.
Consequently, a measurement is obtained more quickly and with less
discomfort than with monitors which measure NIBP during cuff
deflation.
• This device was clinically tested per the requirements of
EN 1060 and AAMI SP-10.
• The NIBP monitor generates alarm messages in situations of
extremely irregular heart beat or patient motion. The monitor
automatically attempts a second measurement in either case.
Description of NIBP
Measurement
The NIBP cuff begins to inflate at the beginning of the NIBP
measurement cycle. As the cuff pressure approaches the diastolic
pressure of the patient, the cuff pressure waveform begins to indicate
the pulse waveform. The cuff pressure at this point is equal to the
patient's diastolic pressure, which is stored by the monitor.
As cuff pressure continues to increase, the pulse waveform (as
measured from BP cuff pressure fluctuation) becomes stronger,
reaching its maximum at the patient's mean arterial pressure (i.e.,
when cuff pressure = mean BP). The monitor stores this value as
mean pressure.
As cuff pressure increases further, it approaches the patient's systolic
pressure, and the cuffs pulse waveform decreases in amplitude. The
cuff pulse waveform disappears at the point where cuff pressure is
equal to the patient's systolic pressure.
When the monitor determines that the cuff waveform has decreased
to zero amplitude, it stores the cuff pressure value as the systolic
pressure, and releases the pressure from the cuff. This typically
occurs at about 10 mmHg over the patient's systolic pressure. The
cuff then rapidly deflates. Because of the pulsatile nature of the
pressure values, the inflation range needs to exceed the systolic and
diastolic values. The dynamic measurement ranges are:
Adult: 35 to 280 mmHg
Pediatric: 35 to 130 mmHg
Neonate: 25 to 130 mmHg