• Publications
  • Influence
Truth cube: Establishing physical standards for soft tissue simulation
This study develops a physical standard to validate real-time soft tissue deformation models by taking CT images of a cube of silicone rubber with a pattern of embedded Teflon spheres that underwent uniaxial compression and spherical indentation tests. Expand
Effects of perfusion on the viscoelastic characteristics of liver.
A new testing method where a whole porcine liver is perfused under physiologic conditions and tested in an ex vivo setting, indicating that the viscoelastic properties of liver change with perfusion and that two time constants on the order of 1.86 and 51.3 can characterize the liver under large strains typical of surgical manipulation across time periods up to 300 s. Expand
Metrics for Laparoscopic Skills Trainers: The Weakest Link!
The results show that the metrics and scoring system represent a technically sound approach that can be easily incorporated in a computerized trainer for any task, enabling a standardized performance assessment method. Expand
The Effects of Testing Environment on the Viscoelastic Properties of Soft Tissues
Measurements made with indentation probes on whole porcine livers in vivo, ex vivo with a perfusion system that maintains temperature, hydration, and physiologic pressure, and ex vivo unperfused, and untreated excised lobes are discussed. Expand
Computer-enhanced laparoscopic training system (CELTS): bridging the gap
CELTS is a novel and standardized skills trainer that combines the advantages of computer simulation with the features of the traditional and popular training boxes and ensures comparability across different training conditions. Expand
In vivo measurement of solid organ visco-elastic properties.
  • M. Ottensmeyer
  • Medicine
  • Studies in health technology and informatics
  • 2002
A minimally invasive instrument has been developed which can perform normal indentation on solid organs, and apply and measure deformations over a frequency range from DC to approximately 100Hz, and was subsequently used in in vivo tests on porcine liver. Expand
TeMPeST I-D: An instrument for measuring solid organ soft tissue properties
No one technique is suitable to capture the full range of behaviors, including non-linear stiffness, visco-elasticity, anisotropy and inhomogeneity, however each has its own advantages, and can be used to contribute data to and cross check the results of the others. Expand
Investigations into Performance of Minimally Invasive Telesurgery with Feedback Time Delays
The results of the research project include the development of the novel FSC algorithm, data on how time delays degrade performance of surgical tasks, and recommendations on how telesurgery should be performed to accommodate telecommunication time delays. Expand
In vivo acceleration of skin growth using a servo-controlled stretching device.
A novel servo-controlled skin-stretching device to apply predetermined tension and waveforms in mice and analysis of mechanotransduction signaling pathways may provide additional insight to improve skin tissue engineering methods and optimize the device. Expand
In Vivo Data Acquisition Instrument for Solid Organ Mechanical Property Measurement
Based on simple tissue models, preliminary estimates for tissue stiffness are presented and the frequency-dependent and non-linear characteristics are discussed. Expand