spiral cuff is shown in open and closed configurations in the
schematic on the left.
On the right, a cuff with a single contact is shown opened
out (top) and in its spiral form (bottom).
The spiral configuration is achieved by laminating two sheets
of silicone rubber together, with one of the layers stretched
in relationship to the other. The stretched layer forms the
internal aspect of the cuff. Increasing the relative stretch
produces a cuff with a smaller internal diameter. Stimulating
contacts are embedded between the outer, unstretched, layer
and the inner, stretched, layer prior to lamination.
Implantation of Self-Sizing Spiral Cuff Electrode.
On the left of this figure, a self-sizing spiral cuff is
shown being placed around a nerve trunk. The arrow points
to one flap of the cuff
On the right, the cuff electrode is in place. Care should
be taken in routing lead wire to avoid tugging on nerve and
lead wire should be placed in a way to avoid nerve injury.