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Fluidic Systems in Printed Circuit Board Technology
Keywords: printed circuit board technology, fluidic system, medical device
The possibility for the realization of microfluidic elements like channels, valves, mixers, pumps is already verified /1/. The advantages are demonstrated for the development of an integrated flow-injection-analysis in PCB-Technology. The integration of electronic circuits is simple and possible without engineering efforts. Up to now, we applied this technology for applications with a flow in the range of milliliters per minute. The efficient production of medical devices requires the integration of fluidic elements also for higher flow applications. The presentation describes the development of a medical device, with a gas flow of up to 50 liters per minute, based on a printed circuit board technology. The applied pressure is in the range of 1 mmHg to 3 bar (0,02 to 43 psi). The channels are realized inside the printed circuit board multilayer stack. An integrated flow sensor consists of channels as flow resistors and surface mounted pressure sensors. Surface mounted valves complete the system. The behavior of the gas flow in the channels is investigated by numerical computer simulation. To tailor the pattern size, the flow resistance in the integrated flow meter has been calculated. The technological challenge is the precise and reliable production of channels inside the PCB stack. A special handling of the prepreg foil during the assembly procedure has been developed. The direct application of the gas into the human body requires investigations of particles and outgases in the gas flow. The economic effect of the technology is due to the omission of plastic flexible tubes and other fluidic coupling elements, electric cables and connectors. A reduction of costs from 20% to 50% is achieved. /1/ Pagel,L; Gassmann,S: Microfluidic Systems in PCB Technology, International Conference on Device Packaging Mrz 2008, IMAPS, Scottsdale, Arizona.
Lienhard Pagel, Prof.
University of Rostock
Rostock, Mecklenburg-Vorpommnern 18052,
Germany


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