A beam splitter includes a first member having at least a first dichroic layer, and a second member having at least a second dichroic layer, the first member being crossed relative to the second member. The tip-resistant sheet is characterized in that the spherical bodies, different from the elastic material and having a diameter equal to or larger than the thickness of the elastic material, are used. The criterion can be, for example, a determined speed of the mobile terminal, or an averaged probability that a CI prediction error is less than a predetermined amount. The table is further suspended from the pendulum assemblies at each point via an assembly to isolate vertical vibrational motion. Radio-opaque medical implants and drug delivery devices and methods for therapeutic site-specific or systemic drug delivery comprising implanting in the body of a patient are also disclosed.