In-vivo mechanical tissue property measurement for improved simulations

Mark P. Ottensmeyer; J. Kenneth Salisbury Jr.

doi:10.1117/12.395051

4 August 2000 In-vivo mechanical tissue property measurement for improved simulations

Mark P. Ottensmeyer, J. Kenneth Salisbury Jr.

Proceedings Volume 4037, Digitization of the Battlespace V and Battlefield Biomedical Technologies II; (2000) https://doi.org/10.1117/12.395051
Event: AeroSense 2000, 2000, Orlando, FL, United States

Abstract

Surgical training today, beyond what can be learned in didactic form or practice on animal or other models, is subject to the availability of appropriate training cases from which students can learn. This is especially true for battlefield surgery, as civilian hospitals may not expose doctors to frequent examples of relevant injuries. To provide a more uniform training experience, covering a standard suite of typical operations without relying on the misfortune of patients requiring surgery, many groups are developing computer-based surgical simulation systems. One of the current areas of development is the implementation of force and tactile (haptic) feedback in simulations. To create a model with realistic haptic feedback, knowledge of the material properties of the tissues in question is essential. While there is much data from tissue samples in vitro, the properties of living tissue in situ are mostly unknown. From the data that is available, it is clear that living tissue and tissue in vitro can have radically different mechanical properties. For this reason, our group is developing surgical tools that will be able to measure the force-displacement characteristics of a variety of tissues in living organisms. Taking these data over the range of frequencies relevant to haptic simulation provides information to extract stiffness and material damping parameters of different kinds of tissue. The tools are being designed for use during minimally invasive surgery, but will permit data to be acquired either during MIS or open procedures. Animal tests are expected to commence in early 2000, but the tools are being designed with safety considerations in mind for eventual use in humans. Data will be taken both for solid organs and for selected elements of the vasculature. These data will be used in simulation systems under development at the Center for Innovative Minimally Invasive Therapy at Massachusetts General Hospital and the Laboratory for Human and Machine Haptics at MIT.

Citation Download Citation

Mark P. Ottensmeyer and J. Kenneth Salisbury Jr. "In-vivo mechanical tissue property measurement for improved simulations", Proc. SPIE 4037, Digitization of the Battlespace V and Battlefield Biomedical Technologies II, (4 August 2000); https://doi.org/10.1117/12.395051

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