After having endured hospitalization, cardio patients usually go through a drawn out rehabilitation phase in the form of outpatient treatment. As part of the rehabilitation measures, it is not seldom that patients are prescribed physical activity under the supervision of a physician. In sports groups of up to 60 participants, patients perform exercises appropriate for their medical conditions. During physical activity it is necessary to monitor the vital functions of all the patients. This data is then used to determine the correct intensity of the exercises, but also to prevent overexertion. The constant measurement of the parameters is especially important here. Along with heart rate, blood pressure is of particular interest in evaluating the cardiovascular system. Up until now there has been no suitable way of determining blood pressure constantly that was both non-invasive and with heart beat accuracy. In order to solve this problem, the Fraunhofer Institute for Photonic Microsystems IPMS has developed a wireless based system that can simultaneously measure the blood pressure of all participants during their exercise sessions. With the software supported display of all measurements, the exercise instructor maintains a constant overview and is able to quickly recognize anomalies in the cardiovascular parameters of the individual patients should they occur.

The system developed by Fraunhofer IPMS consists of a central physician PC and two sensor units per patient. Each participant wears a chest strap to record the ECG and a headband for pulsewave measurement. The solution lies in the ability to determine blood pressure non-invasively with pulse transit time (PTT). This is determined from the incoming measurements from the headband and the chest strap. All of the measurements are transmitted wirelessly to the central physician PC. The PC runs software that processes and evaluates the data from all of the sensors. The participants’ heart rate, systolic and diastolic blood pressure and their fluctuations are later displayed on a monitor for a selected time frame. When predetermined limits are exceeded, an alarm is triggered. All of the electronic components are integrated into a textile structure which can be adjusted to fit various body sizes and forms so that the patient’s movement will at no time be limited or obstructed.

Fraunhofer IPMS will be presenting the pulse transit time measurement system for beat-accurate blood pressure evaluation from January 28 to 31, 2013 at Arab Health, the largest trade show for medical and health care in the Near East at stand ZE58 (German Pavilion, Zabel Hall).

About Fraunhofer IPMS

The Fraunhofer Institute for Photonic Microsystems IPMS and its 200 employees turn over an annual research volume of 20 million euros. Fraunhofer IPMS generates more than two thirds of this production capacity out of commissions from industry and publicly financed projects in applied research. The focus of our development and production services lies in the practical industrial application of unique technological know-how in the fields of (optical) micro-electromechanical systems [MEMS, MOEMS]. Fraunhofer IMPS uses scientific know-how, application experience and customer contacts as well as modern equipment and clean room infrastructure. Fraunhofer IPMS covers a broad spectrum of industrial applications. Our services range from initial conception to product development, right down to serial pilot production – from a single component to a complete system solution.