Realistic Haptic Interaction in Volume Sculpting for Surgery Simulation. In: Ayache N, Delingette H, editors. Surgery Simulation and Soft Tissue Modeling. Berlin: Springer Berlin Heidelberg; 2003. pp. 194-202. [DOI: 10.1007/3-540-45015-7_19]

Expert subjective comparison of haptic models for bone-drill interaction

PURPOSE

A haptic algorithm to simulate the interaction between a surgical drill and bone using a constraint-based algorithm has been previously demonstrated. However, there has been no blinded study to determine whether this algorithm is preferred by professionals who commonly use this type of system METHODS: Fourteen otologic surgeons were presented with a spring-damper model and a constraint-based model of drill-bone interaction rendered on a low-cost haptic device with only linear feedback. The participants were blinded as to what algorithm they were using. They then answered survey questions about their opinions of the models.

RESULTS

The surgeons overwhelmingly preferred the constraint-based model. They generally preferred the constraint-based model in the individual questions as well.

CONCLUSIONS

Follow-up work can be done to fine-tune the parameters in the model, but this study shows that a sophisticated algorithm can make a significant difference even on a low-fidelity haptic device.

Towards a Virtual Reality Simulator for Orthognathic Basic Skils

Bone sawing skill demands a high level of dexterity from the surgeon that can be achieved only with a lot of training. Sawing is a basic skill required in many procedures, such as: osteotomy, ostectomy, amputation and arthroplasty surgery. Inefficient sawing can lead in orthognathic surgery to nerve lesion, bad split and non-union. Using virtual reality technology this complications can be reduced, by training the students on simulators until they assimilate the skill. This paper presents an early prototype for a bone sawing simulator in orthognathic surgery. A voxel-based mandible model obtained from a Computer Tomography is cut by removing the voxels that are inside the saw blade. The collision detection is based on hierarchical bounding volumes. The removal process is observed both visually and haptically.