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The new multi-fiber ligament model is the result of a ground-up re-thinking of how to structure a kinematically - and kinetically-accurate virtual force model. It is capable of representing 6-DOF cross-coupling between joint displacements and the resulting modeled forces. The heuristic constraint model in VIVO™ is an enhanced version of the constraint model used in AMTIs previous simulators, now independently programmable for any axis in force-control mode, and able to represent 2-axis cross-coupling using any axis as the secondary axis. In the heuristic constraint soft tissue model, each axis may operate blackberyy 9790
either a single-input or two-input constraint table. To define a one-input model, 15 axis coordinate values are defined as interpolation points and the constraint force (or moment) at each interpolation point is entered into a table.

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During operation, the controller uses the instantaneous axis coordinate to interpolate into the table and calculate the constraint force. The two-input mode can capture cross-coupling between the main axis and any one of the other five axes. Eight interpolation points are defined for the secondary axis. The constraint force (moment) values are represented as 8 curves, each curve corresponding to one of the interpolation points defined for the secondary axis, and comprising 15 points of variation along the primary axis. The ensemble of 8 curves defines a surface that expresses the constraint force as a 2-parameter function of the main and secondary axis coordinates.

During operation, the controller uses the main and secondary axis coordinates to perform a 2-D interpolation into the constraint table. Every axis offers a completely independent implementation of this model.

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The VivoControl UI offers tools to assist in generating the constraint force tables, such as linear, quadratic and polynomial-fit spring models. Alternatively, the constraint force tables may be generated in a prescribed CSV format by an external application and imported into VivoControl. VivoControl also provides CSV export of the constraint force tables.

Among other uses, the heuristic soft tissue constraint model is typically required for tests that conform to todays ISO and ASTM standards. The heuristic soft tissue model is available in either the Grood and Suntay or Cartesian kinematic modes.

The multi-fiber ligament model arises from a re-imagined approach to soft tissue modeling. Rather than determining ahead of time what constraint force corresponds to every coordinate for each axis, in the multi-fiber ligament model, up to 100 ligament fibers are defined by specifying the (x, y, z) coordinates of their proximal and distal insertion sites on the joint components, their stiffness, and the amount of strain or slack the ligament has when the joint is in the defined reference pose. The length at the reference pose is automatically computed from the coordinates; combined blackberyy 9790
the supplied strain at reference pose, the zero-force length of the ligament is automatically computed.

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During operation, the controller calculates in real time the length and line of action of the ligament fiber.

For engaged fibers, i. e. those stretched beyond their zero-force length, the force thus computed is applied to the Grood and Suntay coordinate axes. Moment-of-force is also computed for each fiber, based on the moment arms between the line of action and the Grood and Suntay axes. The contributing forces and moments of all fibers are summed and applied to the joint. These calculations are performed at every servo tick on the realtime controller. Therefore, they are inherently synchronized blackberyy 9790
the instantaneous kinematic configuration of the joint.

VivoControl also provides CSV-based import export of the multi-fiber ligament model.

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Customers may wish to use an external modeling tool to generate a multi-fiber ligament model. By exporting the model from the external application to the defined CSV-based format, blackberyy 9790 importing that file into VivoControl, tedious and error-prone manual entry of the model is avoided. The multi-fiber ligament model enables the development of testing for sensitivity to ligament balance and post-surgical ligament condition while providing the complex inter-axis coupling exhibited by the natural knee. The concepts inspiring the multi-fiber ligament model may be used for future ASTM and ISO testing standards.

For compactness and maximum service life, VIVO™ utilizes an all hydraulic actuator design. The main bearing of the system is hydrostatically supported to provide low friction, more accurate control, and long life. AMTIs unique hydrodynamic-seal actuators reduce maintenance downtime and are designed to last for hundreds of millions of cycles. separate hydraulic power unit is required for operation.

AMTI can provide hydraulic power units sized for one-, two - or three-station VIVO™ systems.

Customers can use their own infrastructure if preferred. Please consult blackberyy 9790
AMTI regarding requirements.

VIVO™ sets a new standard of protecting your valuable test investment.

Every physical quantity is continuously monitored.

In the event of a fault or an overload, the controller responds to protect the machine and the sample. User-defined limits and a programmed action can also be created for many dynamic variables. This rapid response prevents inadvertent specimen damage during setup as well as during operation of the machine.

Operator safety is enhanced blackberyy 9790
a light curtain safety interlock that encloses the working volume of the machine.

The light curtain may be disabled blackberyy 9790
a key switch for maintenance or setup operations that require the machine to be energized.

Disabling the light curtain protection requires enabling two overrides: the key must be inserted into the key switch and the switch turned to the clearly-labeled DISABLE position, and an override setting must be selected in the VivoControl UI. Turning the key switch to the DISABLE position also activates a flashing alert light. The key cannot be removed from the key switch when the switch is in the DISABLE position.

Therefore, a site protocol regulating access to the key can be used to control the operators ability to defeat the light curtain protection.

The VivoControl UI software runs on a Windows PC in a compact desktop box, blackberyy 9790
several uncommitted USB ports, an optical drive, and two gigabit Ethernet adapters.

VivoControl is pre-installed by AMTI.