This document discusses wearable biosensors and two examples: a ring sensor and smart shirt. It defines a biosensor as a device combining a biological and physiochemical component to detect analytes. The ring sensor monitors physiological signals like pulse oximetry through LEDs and photodiodes on a finger. The smart shirt embeds similar sensors into clothing to continuously monitor vital signs remotely for patients or athletes. Wearable biosensors allow non-obtrusive monitoring but have limitations like initial cost and number of detectable parameters.

2. Need of wearable biosensors
 Introduction
 What is a biosensor ?
 Properties of biosensor
 Wearable biosensors: -
1. Ring sensor
2. Smart shirt
 Conclusion
 References

3.  remote monitoring of patients.
 training support for athelete.
 monitoring of individuals who work with
hazardous elements.
 tracking of professional truck driver’s vital
signs to alert them of fatigue.

4.  Use of wearable monitoring devices allow
continuous monitoring of physiological signals.
 Wearable systems are totally non-obtrusive
devices that allow physicians to overcome the
limitations of ambulatory technology.
 detects events predictive of possible worsening of
the patient’s clinical situations.

5. A biosensor is a device for the
detection of an analyte that
combines a biological component
with a physio-chemical detector
component.

6. Consists of 3 parts:
3.Biological component
4.Physiochemical component.
5.Signal processor.

7. 1. RING SENSOR.
2. SMART SHIRT.

8. Fig 1. photograph of ring
sensor,size of the top
board is 0.8 x 0.8 inch.
Fig 2. ring sensor weared
on a finger.
 works on the principle of plethysmogram and pulse
oximetry.

9.  LED’s and Photodiodes.
 First stage amplifier.
 Sample and Hold circuit.
 Signal Conditioner.
 CPU.
 RF Transmitter.
 Software for the microprocessor on the ring.
 Software for the host computer.
LED’S and
photodiodes.
Micro
processor(inside)
Battery
Transmitter

12.  Continous monitoring.
 Easy to use.
 Reducing hospitalization fee.
 Initial cost is high.
 Limited number of physiological parameters can
be monitored.

13. Fig. Smart Shirt System.

16.  Easy to wear and take off.
 Continous monitoring.
 Initial cost is high.
 Battery life is less.

17.  Smart shirt technology opens up existing opportunities to
develop adaptive & responsive systems that can think &
act based on the user conditions stimuli & environment.
 Certain individuals are susceptible to anaphylaxis reaction
(an allergic reaction) when stung by a bee or spider and need
a shot of adrenaline immediately to prevent further fatalities.
by applying advancements in MEMS(Micro-Electrochemical
systems) technology we can achieve that.
 The Smarts shirt’s delta acquisition capabilities can be used to
detect the condition when an individual is lapsing into a diabetic
shock and this integrated feedback mechanism can provide the
appropriate response to prevent a fatality.

18.  Just as special-purpose chips and processors can be
plugged into a computer motherboard to obtain the
the required information processing capability, the smart
shirt is an information infrastructure in which the wearer
can “plug in” the desired sensors and devices, thereby
creating a system for monitoring vital signs in an efficient
and cost effective manner with a “universal” interface of
clothing.
 Just as the spreadsheet pioneered the field of information
processing that brought “computing to the masses”.It is
anticipated that the smart shirt will bring personalized &
affordable healthcare monitoring to the population at
large.

19.  Park and Jayaraman,”Enhancing the quality of life
through wearable technology”,vol. 22, June-03
 R.Neumann,”Biomedical Sensors” ,handbook of
biomedical instrumentation,page. 725-755
 http://www.sensatex.com/smartshirt.html
 http://en.wikipedia.org/wiki/Biosensor