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Proceedings Paper

In-vivo mechanical tissue property measurement for improved simulations
Author(s): Mark P. Ottensmeyer; J. Kenneth Salisbury Jr.
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Paper 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.

Paper Details

Date Published: 4 August 2000
PDF: 8 pages
Proc. SPIE 4037, Digitization of the Battlespace V and Battlefield Biomedical Technologies II, (4 August 2000); doi: 10.1117/12.395051
Show Author Affiliations
Mark P. Ottensmeyer, MIT Artificial Intelligence Lab. (United States)
J. Kenneth Salisbury Jr., Intuitive Surgical, Inc. (United States)

Published in SPIE Proceedings Vol. 4037:
Digitization of the Battlespace V and Battlefield Biomedical Technologies II
Raja Suresh; Homer H. Pien; Homer H. Pien, Editor(s)

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