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In recent years, the steerable needles have attracted significant interest inMinimally Invasive Surgery (MIS). Amongst these, the flexibleProgrammable-bevel tip needle (PBN) concept has successfully achieved anin-vivo demonstration to evaluate the feasibility of Convection EnhancedDelivery (CED) of chemotherapeutics within the ovine model, with a 2.5 mm PBNprototype. However, further size reduction is necessary for other diagnosticand therapeutic procedures involving deep-seated tissue structures. Since PBNshave a complex cross-section geometry, standard production methods, such asextrusion, fails as the outer diameter is reduced further. This paper presentsour first attempt to demonstrate a new manufacturing method for the PBN thatemploys thermal drawing technology. Experimental characterisation tests wereperformed for the 2.5 mm PBN and a new 1.3 mm Thermally Drawn (TD) PBNprototype described here. The results show that thermal drawing presents asignificant advantage in miniaturising complex needle structures. However, thesteering behaviour is affected due to the choice of material in this firstattempt, a limitation which will be addressed in future work.

Towards a Procedure Optimised Steerable Microcatheter for Deep Seated Neurosurgery