A flexible wiring cable 60 connects a recording head 7 and a relay board, and includes COF 62 for connecting an output side wiring pattern of an IC chip 61 to the recording head 7, and general purpose FFC 63 formed with a parallel wiring pattern. In another aspect, the first pump is coupled to a first probe for extracting fluid from the formation and the second pump is coupled to a second probe for extracting the fluid from the formation. Translating the tissue expansion device through the expansible sheath expands the dimension of the shells to provide even dilation of surrounding tissue. Its novelty consist of the following combination of desirable features:. It provides and uses a precursor polymer of formula below: in which n is a whole number, R1 and R2, identical or different, represent independently an alkyl group, and R3 represents an amino group, a hydrogen atom, an alkyl, a cycloalkyl or a boryl.