An object of the present invention is to provide a communication apparatus and a data distribution system which are fast in the response speed of data distribution and require less space and less electric power. In one aspect, the apparatus has at least one sensor assembly that can be mountable thereon a portion of the implant and that has a passive electrical resonant circuit that can be configured to be selectively electromagnetically coupled to an ex-vivo source of RF energy. The tappet is configured to be reciprocated along the sliding wall.