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Sensing & Measurement

Digital inertial measurement unit

Analog Devices, Inc.

Analog Devices, Inc. announces that OrthAlign, Inc. has selected ADI's high-performance iMEMS® inertial motion sensing technology to enable its new portable surgical navigation system that guides femoral alignment during knee surgery. The KneeAlign® 2 System, which also provides precise tibial alignment, uses an ADI iSensor® digital IMU (inertial measurement unit) to allow an orthopedic surgeon to quickly determine the center of rotation of a patient's femur and calculate the precise angles to cut the bone in knee replacement surgery. 

The ADI iSensor IMU designed into the KneeAlign 2 System supports the six degrees of freedom measurement realized from the merging of three accelerometers that provide linear motion and three gyroscopes capturing angular motion. The iSensor IMU is capable of precisely tracking an instrument's motion on all axes, even under severe operating conditions. The compact IMU device provides access to both calibrated and dynamically compensated sensor data over a standard digital SPI interface with the ability to digitally tune the sensor filtering and processing to adapt to multiple application scenarios.

The compact KneeAlign 2 System combines the alignment precision of large, computer-assisted surgical equipment with the simplicity of conventional instrumentation. The palm-sized KneeAlign unit and its associated cutting instrumentation are compatible with all implant systems used in TKA (total knee arthroplasty), a surgical procedure in which pieces of the knee are replaced with artificial parts.