Innokas Yhtyma Oy VC150 사용자 설명서
KO00065K
VC150 Vital Signs Monitor
8-23
Masimo SpO
2
: Masimo rainbow
®
SET
®
SpO
2
and special features
rainbow Acoustic Monitoring (RAM) Technology
rainbow Acoustic Monitoring (RAM) continuously measures a patient’s
respiration rate based on airflow sounds generated in the upper airway. The
Acoustic Sensor translates airflow sounds generated in the upper airway to an
electrical signal that can be processed to produce a respiration rate, measured
as breaths per minute.
respiration rate based on airflow sounds generated in the upper airway. The
Acoustic Sensor translates airflow sounds generated in the upper airway to an
electrical signal that can be processed to produce a respiration rate, measured
as breaths per minute.
Respiratory sounds include sounds related to respiration such as breath sounds
(during inspiration and expiration), adventitious sounds, cough sounds, snoring
sounds, sneezing sounds, and sounds from the respiratory muscles [1].
(during inspiration and expiration), adventitious sounds, cough sounds, snoring
sounds, sneezing sounds, and sounds from the respiratory muscles [1].
These respiratory sounds often have different characteristics depending on the
location of recording [2] and they originate in the large airways where air
velocity and air turbulence induce vibration in the airway wall. These vibrations
are transmitted, for example, through the lung tissue, thoracic wall and trachea
to the surface where they may be heard with the aid of a stethoscope, a
stethoscope, a microphone or more sophisticated devices.
location of recording [2] and they originate in the large airways where air
velocity and air turbulence induce vibration in the airway wall. These vibrations
are transmitted, for example, through the lung tissue, thoracic wall and trachea
to the surface where they may be heard with the aid of a stethoscope, a
stethoscope, a microphone or more sophisticated devices.
rainbow Acoustic Monitoring Architecture
The following figure illustrates how a respiratory sound produced by a patient
can be turned into a numerical measurement that corresponds to a respiratory
parameter.
can be turned into a numerical measurement that corresponds to a respiratory
parameter.
Patient
The generation of respiratory sounds is primarily related to turbulent respiratory
airflow in upper airways. Sound pressure waves within the airway gas and
airway wall motion contribute to the vibrations that reach the body surface and
are recorded as respiratory sounds.
airflow in upper airways. Sound pressure waves within the airway gas and
airway wall motion contribute to the vibrations that reach the body surface and
are recorded as respiratory sounds.
Although the spectral shape of respiratory sounds varies widely from person to
person, it is often reproducible within the same person, likely reflecting the
strong influence of individual airway anatomy [2-6].
person, it is often reproducible within the same person, likely reflecting the
strong influence of individual airway anatomy [2-6].
Patient
Signal
Sensor
Envelope
Acquisition
RRa Estimation
System
Processing
Respiratory airflow
to sound
to sound
Sound to electrical
signal
signal
Electrical signal to
digital signal
digital signal
Digital signal to
respiratory
measurement
respiratory
measurement
Detection