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1.7 Product parts and accessories

The  Veterinary  Temp-pulse  Oximeter  is  composed  of  host,  USB  cable,  tongue-clip
SpO2  probe  and  reusable  body  cavity  temperature  probe  for  animal.  The  host  is
composed  of  display  screen,  control  buttons  and  so  on.  The  accessories  include
SpO2 probe, reusable body cavity temperature probe for animal and USB cable.

1.7.2

Accessories

The  measurement  of  pulse  oximetry  is  achieved  by  calculating  the  change  in  the
absorption rate of transmitted light during capillary pulsation of animal limbs, tongue,
and  earlobe,  etc.,  which  is  a  continuous,  non-invasive  measurement  method  of
hemoglobin  oxygen  saturation  (  Functional  saturation).  Since  oxyhemoglobin  and
deoxyhemoglobin  show  different  absorption  rates  for  two  specially  selected  incident
lights  with  different  wavelengths,  different  oxyhemoglobin  saturation  can  be
determined, ie, FO2Hb.

The  company's  Veterinary  Temp-pulse  Oximeter  uses  two  transmitted  light  sources
with  different  wavelengths,  namely  about  660  nm  for  red  light  and  about  905  nm  for
infrared light. One side of the sensor contains two LEDs, and the other side contains
a  photoelectric  detector.  The  two  luminous  tubes  emit  lights  alternately.  The  light  is
weak  when  the  pulsation  is  measured  by  the  photoelectric  sensor,  and  the  light  is
stronger  between  two  pulsations,  thus  the  reduced  value  is  the  light  intensity
absorbed  by  the  pulsatile  arterial  blood.  In  this  way,  the  light  absorption  ratio  of  the
two wavelengths can be calculated, thereby the oxygen saturation of the arterial blood
can  be  accurately  measured  within  the  range  of  70%~100%,  obtaining  the  "pleth"
waveform and the pulse rate value.

1.8 Principle of Measurement

Fractional saturation FO2Hb= X100

O2Hb

RHb

O2Hb

MetHb

COHb

Functional oxygen saturation

X100

O2Hb

RHb

O2Hb

1)  As the measurement is taken based on the pulsation of the arteriole, the tester's
blood should ensure a steady flow. For an animal subject with weak perfusion due to
shock,  low  ambient/body  temperature,  massive  haemorrhage,  or  use  of  vascular-
contracting  drug,  the  SpO2  waveform  will  decrease.  In  this  case,  the  measurement
will be more sensitive to interference.
2)  For those drugs with a substantial amount of staining dilution such as blue, indigo,
green,  and  acidic  indigo  methylene,  carbon  monoxide  hemoglobin,  methionine,
thiosalicylic  hemoglobin  and  some  icterus  problems,  the  usage  of  the  device  for
measurement of SpO2 may be inaccurate.
3)  Drugs like dopamine, procaine, prilocaine, lidocaine and butacaine may also be a
major factor blamed for serious error of SpO2 measurement.
4)  The SpO2 value serves only as a reference value for judgement of anemic anoxia
and  toxic  anoxia  in  related  animals.  It  can  also  be  used  as  a  measurement  of  pulse
oximetry for severe anaemic animals.

1.9 Clinical Restrictions

1.7.1

Host

Figure 2 Structure of host

Control
button

Display
Screen

Cable

Probe

Connector

Probe

Cable

Device connector