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Stem Tibia Implants

ORTHOPEDIC IMPLANTS - Measurement Time Reduced with SmartScope® Flash™ 302

About the company

Calibration Specialists Ltd. of Limerick, Ireland, is an independent calibration laboratory focused on meeting the total quality requirements of industry. Proper calibration of today’s sophisticated test and measurement equipment is essential for preserving measurement accuracy, complying with international standards, and to sustain competitive advantage.

Since 1982, Calibration Specialists has forged its reputation through its comprehensive understanding of the ever-expanding calibration market. Calibration Specialists Ltd. was the first INAB accredited calibration laboratory in Ireland.

The Challenge

Orthopedic implants present a unique manufacturing challenge. Many implants are produced on a semi-custom or completely custom basis to suit the individual patient. The stem tibia implant consists of a number of contours, surfaces, and shapes which mirror the shapes in the human tibia. These features are not easily defined as standard lengths, widths, and diameters.  Rather, they are made up of geometries which require a variety of sensors and sophisticated software to analyze correctly.

The OGP Solution

The OGP® SmartScope Flash 302 combines the measurement range, sensors, and accuracy needed to measure stem tibia implants. Optical, laser, and tactile sensors are needed to fully measure all features. For example, optics are used to measure thru-hole diameters, while curved surfaces are measured with the integral Through-The-Lens laser (TTL). The sidewall of the raised edges requires a touch probe as it is not possible for the optics to image this area.

Since the outside profile has a sharply-defined edge, optics were the best choice to characterize the profile of the part. With this profile established, a touch probe was used to acquire all surface geometries in 3D space. OGP 3D metrology software allows all three sensors to be applied in a single routine.

The TTL Laser was used to collect high density measurements on the part’s surface. Measured data was imported into EVOLVE® SmartProfile® for complete GD&T analysis.

The Results

The SmartScope Flash 302 successfully reduced the measurement time of the stem tibia implant by over 50%. In addition to fast measurement, data was analyzed using EVOLVE SmartProfile software from Kotem™, a Division of Quality Vision International. GD&T standards were then applied to comply with ASME Y14.5.