title: Viscoelastic modeling of the contact interaction between a tactile sensor and an atrial tissue.
abstract: Modeling and parameter identification of soft tissue are essential in establishing an accurate contact model for tool-tissue interaction, which can be used in the development of high-fidelity surgical instruments. This paper discusses the interaction between a tissue and a tactile sensor in minimally invasive surgery, the focus being a novel technique for robotic-assisted mitral valve repair, in which tactile sensors are used to distinguish between different kinds of tissue by their relative softness. A discrete viscoelastic model is selected to represent the tissue behavior. To populate the model of the tissue with actual data, a set of tissue-testing experiments is designed and implemented on the atrial tissue of a swine heart by analyzing its dynamic response. By means of a genetic algorithm, data of the complex compliance are extracted and used to find the coefficients of the model. Further, a viscoelastic contact model is developed to model the interaction between the tissue and the tactile sensor with annular shape. Finally, the relation among the indentation displacement, the ratio of the radii, and the applied force is established parametrically.
authors.affiliation: College of Mechanical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China. jjshen@cim.mcgill.ca
authors.forename: Jing Jin
authors.initials: JJ
authors.lastname: Shen
authors.forename: Masoud
authors.initials: M
authors.lastname: Kalantari
authors.forename: József
authors.initials: J
authors.lastname: Kovecses
authors.forename: Jorge
authors.initials: J
authors.lastname: Angeles
authors.forename: Javad
authors.initials: J
authors.lastname: Dargahi
mesh_terms: D000465:Algorithms; D016275:Atrial Function / Q000502:physiology*; D015374:Biosensing Techniques; D003198:Computer Simulation; D055119:Elastic Modulus / Q000502:physiology; D006244:Hardness; D006801:Humans; D008955:Models, Cardiovascular; D010812:Physical Stimulation / Q000295:instrumentation* / Q000379:methods*; D013314:Stress, Mechanical; D013499:Surface Properties; D014110:Touch / Q000502:physiology*; D014160:Transducers, Pressure; D014783:Viscosity