PROJECT TITLE :
Design of an Optically Controlled MR-Compatible Active Needle
An active needle is proposed for the development of magnetic resonance imaging (MRI)-guided percutaneous procedures. The needle uses a coffee-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 lightweight transported via optical fibers and facet coupled to the LT SMA. A prototype, with a size equivalent to a traditional 16-gauge biopsy needle, exhibits significant bending, with a tip deflection of additional than 14° in air and five° in hard tissue. A single-ended optical sensor with a gold-coated tip is developed to live the curvature independently of temperature. The experimental ends up in tissue phantoms show that human tissue causes fast heat dissipation from the wire actuator; but, the active needle can catch up on typical targeting errors during prostate biopsy.
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