The design, fabrication, and testing of microcannulae with integrated insertion stops is presented. The micro-cannulae were engineered through the use of a silicon micro-mold fabricated via bulk-silicon micro-machining techniques. The use of microelectronic fabrication techniques allows precise control of three critical parameters, insertion depth, interface contact area, and tubing out of round. Worst case variations were found to be 5μm for insertion depth, 502μm2 for interface contact area, and 7% for tip out of round. Histological evaluation revealed the cannula to be located correctly within the basal portion of scala tympani.
Date of creation, presentation, or exhibit
Department, Program, or Center
Microsystems Engineering (KGCOE)
Johnson, Dean; Zhu, X.; Frisina, Robert D.; and Borkholder, David, "Micro-molded cannulae for intracochlear infusions in small rodents" (2007). Accessed from
RIT – Main Campus