Real Time Vital Sign Monitoring Using NI Labview

REAL TIME VITAL SIGN MONITORING USING NI LABVIEW

Engr. Narinder Parshad ChowdhryM.Sc. (e-Health & Telemedicine Systems) London, UK

Assistant Professor Dept. of Biomedical EngineeringMehran UET, Jamshoro, Sindh

4th International Conference on Transforming Healthcare with IT 6-7th September Hyderabad India

OUTLINE

Project Overview

Aim & objectives

NI LabView & DAQ System

Design of VIs & user interface

Methodology

Results

Conclusion

Project Overview Project deals with data acquisition & signal processing of vital

signs using NI LabVIEW

Designed algorithms (Virtual Instruments VIs) of heart rate (HR), blood pressure (BP)& pulse oximetry (SpO2)

Firstly, BP is measured using pressure sensor, air cuff & constant air defalting valve

Secondly, our own designed sensor to measure the oxygen saturation, heart rate by using red LED, infrared LED & photodiode

Later, sensor is connected to NI DAQ & measurements are made

AIM & OBJECTIVES

To acquire vital signs (physiological parameters) using biosensors

To interface the obtained data with NI DAQ System which converts it into digital format.

To link the DAQ System with NI LabVIEW and design an algorithm to measure real time data in graphical interface.

Finally, to design & develop a graphical user interface in LabVIEW to display the outputs.

Real time Vital Signs monitoring using NI LabVIEWIntroduction | Literature Review | Hardware |NI Software & DAQ System| Methodology | Results | Conclusion|

BLOOD PRESSURE

• Blood pressure (BP), sometimes it is called arterial blood pressure, is the pressure exerted by circulating blood upon the walls of blood vessels.

• During each heartbeat, blood pressure varies between a maximum (systolic) and a minimum (diastolic) pressure.

Measurement Techniques

• Invasive (Direct measurement)

• Noninvasive (Indirect measurement)

Auscultatory Method

Oscillometric Method


BLOOD PRESSURE

Auscultatory Method

• Need Stethoscope

• Analog Measurement

Oscillometric Method

• Electronic Pressure sensor

• Digital Measurement


BLOOD PRESSURE

Ranges of Blood Pressure in different Ages

Stage Approximate age Systolic, mmHg Diastolic, mmHg

Infants 1 to 12 months 75–100 50–70

Toddlers 1 to 4 years 80–110 50–80

Preschoolers 3 to 5 years 80–110 50–80

School age 6 to 13 years 85–120 50–80

Adolescents 13 to 18 years & > 95–140 60–90


PULSE OXIMETRY (SpO2)

Real time Vital Signs monitoring using NI LabVIEW

• Pulse Oximetry is a device used to measure the oxygen level in our blood.• Our lungs have efficiency to diffuse oxygen into our blood hemoglobin to make it

oxygenated hemoglobin (HbO2) and after the exchange of oxygen with Carbon-di-oxide occurs between tissue and blood then the blood becomes deoxygenated hemoglobin (Hb).

Measurement Technique

• Oxygenated hemoglobin Infrared LED 940nm wavelength

• Deoxygenated hemoglobin Red LED 660nm wavelength

Introduction | Literature Review | Hardware |NI Software & DAQ System| Methodology | Results | Conclusion|



Pulsatile & Non-pulsatile Absorption factors

𝐑=[𝐀𝐂𝟔𝟔𝟎 /𝐃𝐂𝟔𝟔𝟎][𝐀𝐂𝟗𝟒𝟎 /𝐃𝐂𝟗𝟒𝟎]

Oxygen level (SpO2)




Principle of sensor

Current devices


HEART RATE


Normal Ranges

• Newborn baby - 120 to 160• Baby aged from 1 to 12 months - 80 to 140• Baby/toddler aged from 1 to 2 years - 80 to 130• Toddler/young child aged 2 to 6 years - 75 to 120• Child aged 7 to 12 years - 75 to 110• Adult aged 18+ years - 60 to 100• Adult athlete - 40 to 60

Current devices

National H

ealth Service, U

K


BLOOD PRESSURE MECHANISM


Consist of:

• Air Bulb

• Pressure Control Valve

• Hollow Rubber Tube

• Pressure Cuff

• Pressure Sensor



BLOOD PRESSURE MECHANISM



SpO2 & HEART RATE MECHANISM

Consist of:

• Red Light Emitting Diode (Red LED)

• Infrared Light Emitting Diode (IR LED)

• Photodiode / Phototransistor

BPX43



SpO2 & HEART RATE MECHANISM

Finger Placement

IR LED

RED LED

Phototransistor


NI LABVIEW


• National Instruments Corporation, or NI is an American Company which produces automated test equipment and virtual instrumentation software like LabVIEW.

• LabVIEW (short for Laboratory Virtual Instrumentation Engineering Workbench) is a system design platform and development environment for a visual programming language from National Instruments.

Block Diagram

Front panelVI

DAQ SYSTEM


• DAQ or Data acquisition System convert analog waveforms into digital values for processing with minimum noise/artifacts.

Sensors that convert physical parameters to electrical signals.

Analog-to-digital converters that convert electrical signals into digital values.

• Components

NI Compact DAQ: USB based

Input / Output modules

Touch Screen Display

ALGORITHM CONCEPT


STARTEnter the NAME

and AGE

Inflate the cuff up to 180mmHg

Wait until Cuff is deflated up to

30mmHg

Signal is acquired & send for computation

SYSTOLIC

DIASTOLIC

ST

OR

E1)

2)

3

)

N

ame

& A

ge

BP30

sec

ond

sRed LED ON

Photo detector detects the data

Red LED OFF

IR LED ON

Photo detector detects the data

IR LED OFF

Fu

rth

er C

omp

uta

tion

s

HE

AR

T R

AT

ES

pO

2 Lev

el

5 se

c5

sec

SpO

2 & H

R

Dis

pla

yed

& S

aved

in M

S E

xcel

Try

Aga

inY

ES

NO

FIN

ISH


USER INTERFACE

PURPOSE

• To get the Name and Age of the user or patient

• Prompt User for input


BLOOD PRESSURE• Pumping up to 180 mmHg

• Acquiring data until pressure drops up to 30 mmHg

• Further computations on acquired data


BLOOD PRESSUREWhole VI


SpO2 & HEART RATE

1. Turn ON Red Led

2. Acquire & Compute data

𝐑=[𝐀𝐂𝟔𝟔𝟎 /𝐃𝐂𝟔𝟔𝟎][𝐀𝐂𝟗𝟒𝟎 /𝐃𝐂𝟗𝟒𝟎]

𝐑=[𝐀𝐂𝟔𝟔𝟎 /𝐃𝐂𝟔𝟔𝟎][𝐀𝐂𝟗𝟒𝟎 /𝐃𝐂𝟗𝟒𝟎]

𝐑=[𝐀𝐂𝟔𝟔𝟎 /𝐃𝐂𝟔𝟔𝟎][𝐀𝐂𝟗𝟒𝟎 /𝐃𝐂𝟗𝟒𝟎]

3. Turn OFF Red LED & Turn ON IR LED

4. Acquire & Compute data

5. Turn OFF IR LED

HEART RATE


SpO2 & HEART RATEWhole VI


SAVING IN EXCEL1. Acquiring data from VI & Displaying it.

2. Saving Data in MS Excel

3. Option to Try Again


FRONT PANEL


EXPERIMENTS

Whole Appended signal of Blood Pressure


EXPERIMENTS

Result saved in MS Excel


CONCLUSION• Low cost Real time vital sign monitoring and easy to share

and store

• Can be used in user friendly / home environment

• Can be used in rural/remote Areas

• No need for particular atmosphere

• User (patient) can check vital sign routinely or in case any

abnormality occurs

• User may contact with available expert doctor using

Telemedicine

Documents

Real Time Vital Sign Monitoring Using NI Labview