Technological watch

A flexible electrode array with hundreds or thousands channels for clinical use includes an array of at least hundreds of electrodes on a flexible biocompatible polymer substrate. Perfusion through holes are provided through the substrate. Individual elongate leads connect to each of the electrodes, the elongate lead connections being supported by the flexible biocompatible polymer substrate and extending away from the array. Flexible biocompatible polymer insulates the individual elongate lead connections and supporting the array. An interposer with individual channel connections is conductively bonded to the individual elongate lead connections. Sterile bag packaging encloses a portion of the interposer, where the outer side of the package including the array and individual elongate lead is sterile while the inner side of the packaging is non-sterile. The portion interposer inside the package is configured to connect to a circuit board within the packaging.