Pulse Oximeter         R. C. Gupta         S. S. Ahluwalia         CSIO, Chandigarh
Pulse Oximeter   Pulse Oximeter is a medical electronic instrument that measures    Oxygen Saturation (SaO2), the percent...
Pulse Oximeter   Oxygen is transported in blood in two distinct states : under    normal physiological conditions, about ...
Pulse Oximeter                               Principle     Oximetry works by trans-illuminating the tissue containing an  ...
Pulse Oximeter                               Principleii)   The absorbance at both wavelengths have pulsatile (AC)      co...
Pulse OximeterThe output light at each wavelength consists of twocomponents, referred to as AC & DC components respectivel...
Pulse Oximeter     ε IR(Hb) = 0.20     εR(Hb) = 0.86     ε IR(HbO2) = 0.29   εR(HbO2) = 0.12     Calibration Curve
1 V P-P                           50 Hz                          CONTROL                           SIGNAL                 ...
Pulse OximeterSPECIFICATIONS :Measurement Range: Oxygen Saturation (SaO2)        :       40-100% Pulse Rate (BPM)         ...
Pulse OximeterSPECIFICATIONS :Alarms   and Indication:         Alarm for high and low SaO2 percentage.         Alarm for...
Pulse OximeterLab. & Clinical TrialsWe have tested and calibrated the system by using BIO-TEK SpO2 simulator in the whole ...
Pulse OximeterKnow-how transferred & Status :The know-how of Pulse Oximeter was transferred toM/s Pranavam Life Care Instr...
DIFFERENT AVAILABLE MODELS OF PULSE OXIMETER BCIBIG SIZE                SMALL SIZE           FINGER TYPEPRICE: US $1395.00...
DIFFERENT AVAILABLE MODELS OF PULSE OXIMETERNELLCOR                BIG SIZE         HANDHELD SIZEOHMEDA BIG SIZE   BIG SIZ...
Pulse OximeterFlow chart for calculation of SaO2
Pulse oximeter lecture
Pulse oximeter lecture
Pulse oximeter lecture
Pulse oximeter lecture
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Pulse oximeter lecture

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Pulse oximeter lecture

  1. 1. Pulse Oximeter R. C. Gupta S. S. Ahluwalia CSIO, Chandigarh
  2. 2. Pulse Oximeter Pulse Oximeter is a medical electronic instrument that measures Oxygen Saturation (SaO2), the percentage of Hemoglobin saturated with Oxygen & Pulse Rate by Non Invasive technique In this the absorption of light by oxygenated and reduced hemoglobin is measured optically at two wavelengths (RED at 660 nm & Infrared at 940 nm) It enables prompt recognition of Hypoxemia in patients This instrument is immensely useful in monitoring arterial oxygenation in paediatrics including Neonatal Units, OTs, Post- operative Recovery Wards, Trauma Wards. Oximetry has been recommended as a standard instrument for general anaesthetic Pulse Oximetry is also used in monitoring of Pulmonary diseases in adults & in investigation of sleep disorders
  3. 3. Pulse Oximeter Oxygen is transported in blood in two distinct states : under normal physiological conditions, about 98% of Oxygen in the blood is combined with Hb inside the RED blood cells. The remaining 2% is physically dissolved in the plasma The amount of O2 bound to Hb in a given quantity of arterial blood is usually represented by the percent SaO2 which is defined as the ratio of Oxy Hemoglobin (HbO2) concentration to the total concentration of Hb HbO2 SaO2 % = ---------------------- X 100 ( HbO2 + Hb )
  4. 4. Pulse Oximeter Principle Oximetry works by trans-illuminating the tissue containing an arterial blood and evaluating absorption of RED & INFRARED lighti) The light absorbance of oxygenated Hemoglobin (HbO2) is different from that of reduced Hemoglobin (Hb) at the Oximeter’s two wavelengths
  5. 5. Pulse Oximeter Principleii) The absorbance at both wavelengths have pulsatile (AC) component, which is the result of fluctuating volume of arterial blood between source and detector
  6. 6. Pulse OximeterThe output light at each wavelength consists of twocomponents, referred to as AC & DC components respectivelyBased on Beer’s law, Mendelson and Kent derived the relationbetween SaO2 and R/IR ratio ε IR(Hb) (R/IR) - ε R(Hb)SaO2 = [ε IR(Hb) – εIR(HbO2)] (R/IR) + [ε R(HbO2) – εR(Hb)]Where ε (Hb) & ε (HbO2) are millimolar extinction coefficients ofreduced & oxyhemoglobin respectivelyR / IR = A 660 nm / A 940 nm = (ACR / DCR) / (ACIR / DCIR)
  7. 7. Pulse Oximeter ε IR(Hb) = 0.20 εR(Hb) = 0.86 ε IR(HbO2) = 0.29 εR(HbO2) = 0.12 Calibration Curve
  8. 8. 1 V P-P 50 Hz CONTROL SIGNAL Pulse Oximeter GENERATOR PULSE SHAPING VACR CIRCUIT LED DRIVERS VACRRed LED IR LED RED CHANNEL660nm 940 nm SEPARATOR SAMPLE RED HOLD SUBTRACTOR FILTER OF MULTIPLIER ADC & AC & DC COMPONENT SaO2 AND PULSE RATE DISPLAY FINGER TIP AMBIENT I/V SAMPLE HOLD LIGHT µP with CONVERTER CHANNEL I/O & & memories PHOTO DETECTOR PRE- VDCR VDCIR PORT AMPLIFIER KEYBOARDFINGER PROBE SEPARATOR 2500 S OF SAMPLE HOLD SUBTRACTOR FILTER AC & DC MULTIPLIER ADC & IR COMPONENT IR CHANNEL VACIR RED LED ON BOTH LEDs OFF IR LED ON BLOCK DIAGRAM BOTH LEDs OFF 625 S TIMING SEQUENCE
  9. 9. Pulse OximeterSPECIFICATIONS :Measurement Range: Oxygen Saturation (SaO2) : 40-100% Pulse Rate (BPM) : 30-240 bpmAccuracy: Oxygen Saturation (SaO2) : ±2 Digits Pulse Rate (BPM) : ±3 DigitsResolution: Oxygen Saturation (SaO2) : 1% Pulse Rate (BPM) : 1BPMDisplay: Two Three digit red seven segment display for oxygen saturation and pulse rate. Ten segment bar graph display for pulse amplitude.Sensor Compatibility: DS-100A : Nellcor Dura sensor for Adult Wavelength : 660nm (RED), 940nm (IR)
  10. 10. Pulse OximeterSPECIFICATIONS :Alarms and Indication:  Alarm for high and low SaO2 percentage.  Alarm for high and low Pulse Rate.  Beep sound with each detected pulse when a sensor’s derived signal is present.  Visual indication if sensor accidentally slipped from finger.  RS232 PC interface for data downloading and displaying Plethysmographic signal.  Battery Low warning and alarms.Trend facility: Store the trend data upto 100 patients and 24Hrs of run time. With Trend Analysis Software.Electrical Specification: Mains Voltage : 230V AC, 50Hz Power Consumption : Less than 1 watt Battery Backup : Inbuilt rechargeable Lead Acid battery of 6V/3.2AH With 16 hrs backup at full charge
  11. 11. Pulse OximeterLab. & Clinical TrialsWe have tested and calibrated the system by using BIO-TEK SpO2 simulator in the whole range of SaO2 andPulse Rate and then taken to Deptt. ofAnaesthesia, PGI, Chandigarh for its clinical trials onpatients. The results of the system were compared withDatex Ohmeda (PGI) System and found satisfactory asper our specifications.
  12. 12. Pulse OximeterKnow-how transferred & Status :The know-how of Pulse Oximeter was transferred toM/s Pranavam Life Care Instruments (P) Ltd, Ernakulam & inproduction
  13. 13. DIFFERENT AVAILABLE MODELS OF PULSE OXIMETER BCIBIG SIZE SMALL SIZE FINGER TYPEPRICE: US $1395.00 PRICE: US $1095.00 PRICE: $279.95PRICE: RS 69750 PRICE: RS 54750 PRICE: RS 13975 HANDHELD SIZE PRICE: US $ 695.00 PRICE: RS 34750
  14. 14. DIFFERENT AVAILABLE MODELS OF PULSE OXIMETERNELLCOR BIG SIZE HANDHELD SIZEOHMEDA BIG SIZE BIG SIZE + PRINTER HANDHELD SIZE
  15. 15. Pulse OximeterFlow chart for calculation of SaO2

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