Pulse Oximeter
INV-430J/PE
Precautions
Do not attempt to repair the Pulse Oximeter by yourself. Only
certified engineers should maintain and repair it.
Change the contact position between the Oximeter probe and
the finger periodically if you are monitoring your SpO
2
levels
and pulse rate for more than 2 hours.
This product is not designed to be used by newborn babies.
Seek for medical care if the measured value goes beyond the
normal range and you are sure that the instrument is not
malfunctioning.
The pulse oximeter uses infrared light (invisible to your eyes) to
measure your SpO
2
levels. Hence, please do not stare at the
light-emitting components of the Oximeter, as that could cause
harm and/or potentially blind your eyes.
For details about clinical limitations and contraindications,
please carefully consult relevant medical literatures.
The following factors may affect the accuracy of measurement:
◆
The Oximeter is used in an environment involving
high-frequency devices, such as high-frequency electric knives
and CT apparatuses.
◆
The probe of the Oximeter is placed on the same arm that a
blood pressure cuff arterial duct or intravenous injection.
◆
The user suffers from hypotension, severe vascular atrophy,
severe anemia, or low oxygen.
◆
The user is in sudden cardiac arrest or shock state.
◆
The user is wearing nail polish or artificial nails.
Warning:
Do not use the Oximeter in an environment with any
flammable gases, flammable anesthetic, or other flammable substances.
Warning:
Keep unit and lanyard away from children as the included
lanyard may present an entanglement or choking hazard to small
children. Adult supervision required; never leave children unattended
with unit or lanyard.
Warning:
Do not throw the batteries into fire, as that could cause an
explosion.
Warning:
Do not attempt to charge the included batteries, as that could
cause leakage, fire disaster, or even explosion. Dispose the used
batteries in accordance to the local laws and regulations.
Warning:
Do not use the Oximeter in an MRI or CT environment.
Warning:
Do not operate the Oximeter if it is wet. Avoid moving the
oximeter from a cold to a hot and humid environment.
Warning:
Install the batteries properly before powering on the Oximeter
for normal use. Please remove the batteries if you are not planning to
use the Oximeter for a long time.
Warning:
Close the battery cover when the instrument is in use.
Symbol Conventions
Symbol
Description
BF-type application part
Caution: Please see this manual.
%SpO
2
Symbol of oxygen saturation
bpmPR
Symbol of pulse rate
Temperature limitation
When end users abandon this product, they
must send the product to the collection place
for recycling.
Manufacturer information
Overview
SpO
2
stands for peripheral capillary oxygen saturation. Oxygen
saturation is defined as the ratio of oxyhemoglobin (HbO2) to the total
concentration of hemoglobin (i.e. Oxyhemo reduced hemoglobin)
present in the blood. It is an important physiological parameter involved
in respiration and circulation. The Pulse Oximeter feature herein is small,
portable, non-invasive and easy to use. The user only needs to insert a
finger into the chamber to measure his/her SpO
2
and pulse rate.
Working Principles, Expected Usage, and Applicable Scope
Oxygenated blood absorbs light at 660nm (red light), whereas
deoxygenated blood absorbs light preferentially at 905nm (infra-red). A
pulse oximeter works by passing a beam of red
and infrared light through a pulsating capillary
bed and then measure the amount of red and
infrared light emerging from the tissues via a
sensor. To improve accuracy, the NV-430J/PE
uses a proprietary algorithm to collect data from pulsatile arterial blood
and ignores local noise from the tissues. The relative absorption of light
by oxyhemoglobin (HbO) and deoxyhemoglobin is then processed
according to the Beer-Lambert's law and a qualitative measurement of
the users’ oxyhemoglobin status i.e. Oxygen saturation level (SpO
2
)
derived.
This device is intended for non-medical use in healthy people to monitor
their pulse and blood oxygen levels for sports and/or aviation only. Do not
use for continuous monitoring.
Limitations
Spot check pulse oximeter takes 1-2 reading every second and takes an
average of 3-6 readings before displaying the result. Hence, you will
have to wait at least 3-6 seconds before a result will be displayed on the
monitor. If the pulse oximeter fails to detect blood flow for the first few
seconds, then the results will be delayed accordingly.
The pulse oximeter does not work for people with naturally small fingers
or low peripheral blood flow. This is because the pulse oximeter would
not have enough blood to take a measurement. Please note that prolong
use of a pulse oximeter, hypotension, vasoconstriction, hypothermia and
certain medications can lead to low or restricted blood flow. Nail polish
can also impede the pulse oximeter from taking a reading.
Finally, it is generally accepted that the saturation percentage is
unreliable on the steep part (around 60 mm Hg) of the oxyhemoglobin
dissociation curve.
Innovative features of the INV-430J/PE
The INV-430J/PE attempts to ameliorate some of the above problems by
1) Increasing the sensitivity of the sensor so that it can measure the
user’s SpO
2
and Pulse Rate (PR) at blood perfusion Index (PI) as low as
0.2%.
2) Comes with anti-motion technology so that the pulse oximeters can
still function even when the finger moves.
3) Using a self-adjusting smart spring system to fit the finger snugly but
not so tight as to impede blood flow that might lead to a low PI.
4) Using soft, hypoallergenic medical grade silicon in the finger chamber
so that the pulse oximeter will not cause discomfort.
4) Using solid ABS plastic to block ambient light from reaching the sensor
so that the signal to background ratio and the accuracy of the
measurement is dramatically increased.
5) Having a plethysmograph that allows the user to see and gauge the
amount of blood detected by the pulse oximeter. This will allow the user
to know if the finger is properly inserted into the finger chamber and if the
pulse oximeter is taking the measurements properly (See below for
details)
Operation Guide
Switch on the power supply of the pulse Oximeter
Stick one finger completely into the
finger chamber of the Oximeter. The
fingernail should be facing upward.
Release the clip and press the power
key to power on the Pulse Oximeter.
The INV-430J/PE pulse oximeter
sensor
Light beams
sensor
