An elongated optical guidewire assembly, such as for optically imaging a patient from within another catheter, can have a lead portion and a probe portion. A connector between the lead and probe portions can include a bore including first and second bore ends. The first bore end can include a substantially circular cross-sectional profile. The second bore end can include a substantially non-circular cross-sectional profile. The bore can be configured to receive the optical guidewire assembly at the first bore end and configured to deform the optical guidewire assembly at the second bore end such that probe and lead ends of the optical guidewire assembly are deformed into a substantially non-circular profile and located between the first and second bore ends.
