AMTI - Model VIVO - Joint Simulation System
The VIVO Joint Simulation System by AMTI revolutionizes the field of joint motion simulation by offering unparalleled kinetic and kinematic realism to approximate in-vivo conditions closely. This system is equipped with a groundbreaking full-speed, full-load environment that supports six degrees of freedom, allowing for comprehensive testing of various joint prostheses and biological specimens. Its compact design optimizes laboratory space while facilitating the study of human joints. The VIVO's capabilities are enhanced by its virtual soft tissue models, including the multi-fiber ligament and heuristic constraint models, which simulate soft tissue forces critical for accurate joint contact force recreation. The system supports dynamic test protocols, covering a spectrum from standard daily activities to extreme sports and injury scenarios. Its robust design includes a temperature-controlled serum circulation system for fluid-environment tests and utilizes advanced control systems for stability and precision in cyclic testing, making it highly suitable for ISO and ASTM standard-compliant research.
AMTI’s VIVO brings new life to joint motion simulation, dramatically increasing the kinetic and kinematic realism of simulation to provide the closest possible approach to in-vivo conditions. The VIVO provides the world’s first full-speed, full-load, six DOF environment in which to test joint prostheses and biological joint specimens. The VIVO’s workspace and compact packaging are designed to facilitate human joint studies while minimizing the use of laboratory floor space.
An accurate simulation of the kinematics, kinetics and durability of a joint’s structure requires accurate re-creation of the joint contact forces experienced in-vivo. Since soft-tissue forces can contribute very significantly to the joint contact force, a realistic simulation environment must include a way to simulate the effects of soft tissue forces. The VIVO supports two patented virtual soft tissue models: the exclusive multi-fiber ligament model and the heuristic constraint model for every axis of the VIVO that is in force-control mode.
- Six degrees of freedom – all joint motions can be controlled and measured
- Each axis may operate in force or position control – including zero-force control to simulate an unconstrained axis
- Convenient user programming of force and motion profiles
- AMTI’s exclusive multi-fiber ligament model – captures 6-DOF soft tissue inter-axis coupling
- Traditional heuristic soft tissue model also supported
- Classic Cartesian coordinate system
- Grood and Suntay coordinate system – kinematics are described using joint-referenced virtualized axes
- Iterative learning control – advanced feed-forward control system provides stability and rapid convergence to command during cyclic testing
- Temperature-controlled serum circulation and containment system
- One to three independently programmable test stations in a single frame – reduces capital acquisition cost, floor space requirement and power connections
- Optional VivoSim visualization software – provides an accurately scaled real-time display of the Vivo machine, the component under test, and the multi-fiber ligament model
- Designed for long service life
- Advanced test specimen protection and safety
- Performs a wide range of ISO and ASTM Standards