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Biomedical subjects

S Z Barnes

Publications and source records attributed to S Z Barnes.

3 recordsLinked to original sources

The realization of a haptic (force feedback) interface device for the purpose of angioplasty surgery simulation.

Simulation is becoming an increasingly accepted method for training personnel for complex or high risk tasks. With the advent of modern Virtual Reality (VR) technology, such simulations are becoming more and more immersive. One significant limitation to the advance of this science is the challenges associated with simulating the touch or feel of various tasks in conjunction with VR simulations. This work has focused on creating and assessing the feasibility of haptic technology for high fidelity surgery simulation. It has culminated in a prototypical interface device to provide tactile feedback during the simulation of complex interventional radiology procedures such as Angioplasty. This device extends state of the art motion control, distributed computing processes, high resolution sensors for real-time feedback, and modular design techniques to accomplish these goals. The realization of the device, its capabilities, interfacing requirements, its limitations, and future extensions will be presented here.

Angioplasty, Balloon↗

The mechanics of drop landing on a flat surface--a preliminary study.

In an effort to investigate the mechanics of drop landing on a flat surface, bilateral performance characteristics during the landing were investigated. Two force plates were used as landing surfaces, and the six component kinetic time histories and the path of the center of pressure were measured for both feet. The forces were combined to obtain the resultant ground reaction force, allowing comparison between the global resultant and the forces developed by each leg. The results highlighted an asymmetry, and the presence of one dominant leg during the landing: the contact with the plate occurred with a delay between the dominant and non-dominant legs, and the forces applied to the plate were also unequal. Furthermore, due to the high rate of data acquisition and sensitivity of the force plates used, it was possible to correlate the peaks present in the global vertical reaction force with the impact of the different anatomical segments of each foot. The availability of such high resolution information presents to researchers and clinicians with more key identifiers to quantify various phenomena, potentially injury prevention, pathological diagnosis or quantification, and others.

Adult↗

Measurement of angular displacements using Hall effect transducers.

Hall effect transducers were studied as an alternative to limited-wear precision potentiometers and optical encoders in measuring angular displacements. Various design parameters are identified, and the optimum Hall effect transducer configuration is presented. Using this configuration, it was possible to measure an angular rotation of 140 degrees with a standard deviation of 0.5 degrees. Within the +/- 35 degrees mid-range of the total 140 degrees, the standard deviation improved to 0.1 degrees.

Biomechanical Phenomena↗