LED Modulation
Power consumption problem can be solved with a lighting modulation technique. Instead of lighting the skin continually the LEDis turned on only for a short time, say 100-1000ns and the signal is sampled within the period. High frequency low duty cycle modulation implemented minimizes LED power consumption.
Basic Principle Of Ring Sensor
Each time the heart muscle contracts, blood is ejected from the ventricles and a pulse of pressure is transmitted through the circulatory system. This pressure pulse when traveling through the vessels, causes vessel wall displacement which is measurable at various points inorder to detect pulsatile blood volume changes by photoelectric method, photo conductors are used normally photo resistors are used, for amplification purpose photo transistors are used
Working
The LEDs and PD are placed on the flanks of the finger either reflective or transmittal type can be used. For avoiding motion disturbances quite stable transmittal method is used. Transmittal type has a powerful LED for transmitting light across the finger. This power consumption problem can be solved with a light modulation technique using high-speed devices.
Ring Sensor
It is a pulse oximetry sensor that allows one to continuously monitor heart rate and oxygen saturation in a totally unobtrusive way. The device is shaped like a ring and thus it can be worn for long periods of time without any discomfort to the subject.
Abstract
Recent advancements in miniature devices have fostered a dramatic growth of interest of wearable technology. Wearable Bio-Sensors (WBS) will permit continuous cardiovascular (CV) monitoring in a number of novel settings. WBS could play an important role in the wireless surveillance of people during hazardous operations (military, firefighting, etc) or such sensors could be dispensed during a mass civilian casualty occurrence. They typically rely on wireless, miniature sensors enclosed in ring or a shirt.
Impact Of The Smart Shirt
The smart shirt will have significant impact on the practice of medium since it fulfills the critical need for a technology that can enhance the quality of life while reducing the health care cost across the continuum of life that is from newborns to senior citizens, and across the continuum of medical care that is from hospitals and everywhere in between.
Introduction
Wearable sensors and systems have evolved to the point that they can be considered ready for clinical application. The use of wearable monitoring devices that allow continuous or intermittent monitoring of physiological signals is critical for the advancement of both the diagnosis as well as treatment of diseases.
Future Trends
By providing the “platform” for a suite of sensors that can be utilized to monitor an individual unobtrusively. Smart Shirt technology opens up existing opportunities to develop “adaptive and responsive” systems that can “think” and “act” based on the users condition, stimuli and environment. Thus, the rich vital signs delta steam from the smart shirt can be used to design and experiment “real-time” feedback mechanism (as part of the smart shirt system) to embrace the quality of care for this individual by providing appropriate and timely medical inspections.
Conclusion
The ring sensor and smart shirt are an effective and comfortable, and mobile information infrastructure that can be made to the individual’s requirements to take advantage of the advancements in telemedicine and information processing. Just as special-purpose chips and processors can be plugged into a computer motherboard to obtain the required information processing capability, the smart shirt is an information infrastructure into 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 the “universal“ interface of clothing.
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