Stretchable biological electrodes

Although the materials of the flexible PCB aren’t expandable, we have succeeded in realizing a stretchable PCB by combining laser cutters and papercutting (kirie) techniques.
伸縮する生体電極

(Developed Product) Picture: Working sample of an EMG with Ag/AgCl electrodes fixed as supporters without any need for gel.

Biomedical electrodes that can stretch according to the various forms of the body are needed to measure ECG, EEG and EMG. At Elephantech, we have succeeded in achieving a stretchable circuit board type biomedical electrode by using a laser cutter to add papercutting incisions to a flexible PCB. As with standard flexible PCB, this stretchable PCB has a constant resistance value through its expansion range and allows for soldering.



筋電などを計る生体電極

Biological electrodes to measure myoelectric potential

How the non-stretchable flexible PCB can stretch

切り絵 基板

The particularity of the materials used in flexible PCB is that, while not expandable, it can be bent. Comparing it to an origami pattern, the red area buckles from the plane and becomes a curved surface in order to allow the entire sheet to stretch in appearance. As with standard flexible PCB, this stretchable PCB maintains a constant resistance value through its expansion range and allows for soldering. In addition to this, by elongating this red area, even sheets made of thick or hard materials can be easily bent or stretched. As an example, it can also be applied to making flexible PCB with thick and durable materials.

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