Outside Observer, an Enhanced Training Methodology: Bringing Back the Expert's Eye whilst Training Alone.

Traditional surgical teaching requires an expert trainer to be present during training. This training model allows an expert to observe a novice's performance and provide corrective feedback as errors are made. Virtual simulations offer a much needed alternative to learning through error and allow the trainee to hone skills without the presence of a skilled surgical trainer. However, current simulations limit the scope of training to tool directed learning, focusing training around instrumented simulated tool tips. This paper identifies a need for trainee centered virtual training to complement current approaches. The Outside Observer training methodology provides training feedback based on the observation of surgical tool tip manipulations in conjunction with the external movements a trainee performs during a procedure. It is thought that integrating movement and posture training with current tool tracking methods will provide more effective and accelerated learning.

Modification of commercial force feedback hardware for needle insertion simulation.

A SensAble Omni force feedback device has been modified to increase the face validity of a needle insertion simulation. The new end effector uses a real needle hub and shortened needle shaft in place of the Omni's pre-fitted pen shaped end effector. This modification facilitates correct procedural training through the simulation of co-located visual and haptic cues in an augmented reality approach to simulation. The development of the new end effector is described and a pictorial guide to its manufacture and the fitting process is provided. Initial results from face validation studies bode well for the fidelity of this low cost device.