Bionix® Knee Wear Simulator: Replicating a Full Range of Knee Forces and Motions

Orthopedic researchers around the world use the Bionix® Knee Wear Simulators to conduct fatigue, long-term wear, and durability tests of implantable knee devices and related materials. These simulators are precise and durable, and accurately replicate the full range of real-world knee forces and motions required to create the high-quality wear data essential for gaining device approval, corroborating production processes, and pursuing continued development. Multistation Bionix Knee Wear Simulators are fitted with six test stations to enable statistically important sampling and reduce testing time. They have a compact, modular design that incorporates the latest in MTS servohydraulic load frame technology, versatile FlexTest® controls and proven MTS application software. This combination offers the configurability and ease-of-use required to achieve the most stringent research requirements and adapt freely to varied and evolving standards.

Precise, Reliable Servohydraulic Power Module MTS is designed to handle critical need of customers for absolute system reliability and constant uptime. It is built using only superior materials and components. The simulator uses an advanced hydraulic actuation scheme that offers precise, closed-loop control of four independent degrees of freedom, while displaying levels of dynamic performance and stiffness not possible with other actuation techniques. User-defined flexion/extension (My), anterior/posterior (Fx), axial force (Fz), and tibial rotation (Mz) motions are produced by durable, low-friction MTS linear actuators and advanced servovalve technology. Furthermore, the simulator can achieve operating speeds of up to two cycles per second to accommodate accelerated test protocols. The six-station configuration matches the statistical sample size stipulated by existing testing standards.

A Complete Selection of Optional Accessories

With the available range of optional MTS test accessories, Bionix Knee Wear Simulators can be easily configured to provide a full spectrum of knee wear simulation requirements.

Load Soak: A load–soak partner system works autonomously to subject control specimens to axial forces (Fz) only. It has separate closed loop control channels to guarantee synchronization with active wear simulator load channels and stands alone to make best use of laboratory layout flexibility.

Force Sensing: The simulator can accommodate a number of force measurement devices, including high accuracy single degree-of-freedom cells, delta pressure transducers, and six degree-of-freedom cells.

Fluid Sensing: The optional fluid-level sensing module minimizes the need for manual monitoring by automatically alerting operators when fluids drop below scheduled levels in any specimen containment module.

Test Fixturing: MTS test fixtures are designed to maintain superior quality system-to-specimen interfaces. The optional ISO 14243 Knee Wear Fixturing Module permits free floating varus (+)/valgus (-) and medial/lateral (Fy) motions. The optional High Displacement Knee Wear Module allows for modifiable, locking varus (+)/valgus (-), and medial/lateral (Fy) motions.

Temperature Control: The optional temperature control module circulates tempered fluid via a closed–heat exchange system to maintain tight control of testing temperatures. Circulating fluid is kept totally segregated from the test fluid and specimen at all times, making certain that any debris produced by the wear simulation stays within the specimen–containment module.

Optional High Displacement Fixturing

User-Friendly Specimen Containment Modules

The Bionix Knee Wear Simulator can house a number of specimen fixturing and containment approaches. Specimen containment modules for ISO 14242 fixtures, for instance, are engineered to enable easy removal and transport of specimens to and from clean environments for inspection and debris analysis. An advanced pin-and-slot mounting scheme improves test repeatability by guaranteeing that femoral and tibial components of the specimen can be returned to their precise test locations after removal and inspection intervals.

Sophisticated Digital Controls and Software

The Bionix Knee Wear Simulator employs adavanced FlexTest digital controls and user-friendly Multipurpose TestWare® (MPT™) application software. MPT software has an easy-to-use “drag-and-drop” environment for developing both standard and non-standard tests and allows users to use their favorite spreadsheet or analysis program to test, plot and report data. MPT software also includes techniques for operating complex profiles based on ISO and ASTM standards. Users can create far greater loads and displacement than currently required, equipping them to meet future test needs. The users can also input other profiles of interest such as complex wave shapes and phasing, duty-cycle loading with varying end levels, and simulations of periodic extreme conditions to copy twisting and stair climbing.

Unmatched Service and Support

The Bionix Knee Wear Simulator is supported by the largest, most experienced global service and consulting staff of any biomedical testing solutions provider. This worldwide team offers a broad range of onsite services to help maximize customer’s test laboratory’s productivity, such as system lifecycle management, preventive maintenance, technology transfer, problem solving, consulting engineering and process optimization.

Be Certain with MTS

The Bionix Knee Wear Simulator is an important component in any structured knee implant development program. For implant approval, production verification, or continued research, this system offers the accuracy, repeatability, and detailed time histories customers need to generate high-quality wear data.

Product Specifications

BIONIX KNEE WEAR SIMULATOR

5 deg
-5 deg~0 N•m*
~0 N•m*5 deg
-5 deg**  7.5 mm
-7.5 mm~0 N*
~0 N*3.7 mm
3.7 mm**

6 Station Base Power Module Optional – ISO 14243 Knee Wear Fixturing Module Optional – High Displacement Knee Wear
Load Frame Range of Motion Load Frame Range of Forces (per specimen Fixture Range of Motion Fixture Range of Forces (per specimen Fixture Range of Motion Fixture Range of Forces (per specimen)
Flexion/Extension (My) 180 deg
-20 deg
74 N•m
-74 N•m
67 deg
-5 deg
74 N•m
-74 N•m
180 deg
-20 deg
74 N•m
-74 N•m
Varus (+) / Valgus (–) (Mx) (see fixturing)
Tibial Rotation (Mz) 12.3 deg
-12.3 deg
74 N•m
-74 N•m
7.0 deg
-5.9 deg
74 N•m
-74 N•m
12 deg
-12 deg
74 N•m
-74 N•m
Axial Force (Fz) 50 mm
-50 mm
10,000 N
0 N
50 mm
-50 mm
5000 N
0 N
50 mm
-50 mm
10,000 N
0 N
Anterior/Posterior (Fx) 25.4 mm
-25.4 mm
1667 N
-1667 N
7.5 mm
-7.5 mm
1667 N
-1667 N
25 mm
-25 mm
1667 N
-1667 N
Medial/Lateral (Fy) Translation (see fixturing)

BLUE text indicates controlled DOF
* Free-floating axis
** Adjustable position, locked during operation

Simulator Dimensions

LENGTH DEPTH HEIGHT (COVER CLOSED) HEIGHT (COVER OPEN) WEIGHT
1320 mm
(52 in)
1145 mm
(45 in)
1725 mm
(68 in)
2235 mm
(88 in)
1590 kg
(3506 lb)

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