Design of an Optically Controlled MR-Compatible Active Needle IEEE TRANSACTIONS ON ROBOTICS Ryu, S. C., Quek, Z. F., Koh, J., Renaud, P., Black, R. J., Moslehi, B., Daniel, B. L., Cho, K., Cutkosky, M. R. 2015; 31 (1): 1-11


An active needle is proposed for the development of magnetic resonance imaging (MRI)-guided percutaneous procedures. The needle uses a low-transition-temperature shape memory alloy (LT SMA) wire actuator to produce bending in the distal section of the needle. Actuation is achieved with internal optical heating using laser light transported via optical fibers and side coupled to the LT SMA. A prototype, with a size equivalent to a standard 16-gauge biopsy needle, exhibits significant bending, with a tip deflection of more than 14° in air and 5° in hard tissue. A single-ended optical sensor with a gold-coated tip is developed to measure the curvature independently of temperature. The experimental results in tissue phantoms show that human tissue causes fast heat dissipation from the wire actuator; however, the active needle can compensate for typical targeting errors during prostate biopsy.

View details for DOI 10.1109/TRO.2014.2367351

View details for Web of Science ID 000352057900001

View details for PubMedCentralID PMC4620588