Miniaturised PCBs for medical technology
The miniaturisation of medical assemblies requires extremely small interconnect solutions and therefore very small PCB dimensions, with corresponding challenges, e.g. the conductor track widths and distances are currently only 50μm and are getting smaller and smaller. Electrical connections of the individual layers are realised using minute ‘stacked vias’. A technological challenge here is the small annular rings around the vias produced using lasers. Thanks to years of experience and high positioning accuracy, designs with 150μm pad size and 50μm annular ring are already possible today. The solder resist also has to be positioned very precisely. It is also important to note that the polyimide composite expands or shrinks during processing. This effect has to be minimised or compensated as far as possible. Thanks to highly miniaturised PCB technology as a carrier for electronics, ‘smart capsules’, which monitor specific body parameters and transmit the relevant data or deliver a controlled dose of medication, have now become a reality.
AT&S – www.ats.net
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