In one embodiment, a waveguide lens of the invention has a pair of planar waveguides, e. One pack includes an isocyanate-functional prepolymer formed by reacting a polyisocyanate with an alcohol. The coupling member is configured to be coupled to and extend between the first elongate member and the second elongate member to couple the first elongate member to the second elongate member when the medical device is in a first configuration.