Measurement & Inspection
defects. “Sometimes, bad parts are not caught during the production process, and they will be inspected and rejected at the hospital prior to an implant,” he said. Rejection by a doctor is, according to Trevisani, a significant issue for both a hospital and supplier. To move away from a subjective process with potential bias influenced by an operator, Marposs developed the Orthoflex automatic inspection system. The heart of the system is a visual system that collects data as it scans the surface of super-finished spherical shoulder and hip joints. Scratches, nicks, and other surface defects are identified and visualized on a screen and a report is produced that is uniquely identi- fied with each implant’s serial number. The system currently works for the spherical portions of shoulder and hip implants, while knee inspection would require further development, according to Trevisani. Introduced four years ago worldwide, the company reports that acceptance by companies used to end-of-line inspectors is slow but steady. “The difference with
Orthoflex is that once it is set with proper reject thresholds it does not miss bad parts,” Trevisani said.
Another dedicated device—for measuring stents—is just now coming on the market from Sensofar (Carefree, AZ). The motivation behind a dedicated device is clear to Ferran Laguarta, president and CEO of Sensofar Medical. “There are over 15 million stents produced worldwide, 5 million in the USA alone and each one needs to be inspected,” he said. Today, that also means a human-intensive process or automa- tion combined with existing metrology equipment that makes for an expensive solution. “We have been very conscious of price while developing our system,” he said. Their solution is the Q six that combines a high-resolution color camera, three different lighting sources, and an inter- ferometric sensor for 3D measurements. The 2D imaging produces inspections of inner and outer surfaces and the sidewalls of the stents for CD measurements and defect detection and classification. The 3D modes provide surface
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ManufacturingEngineeringMedia.com | May 2014
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