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medical manufacturing


ZONE3 also comes in a Pro version, with additional advanced features including simultaneous evaluations, ad- vanced reporting, variables and scripting. The TeleStar Plus Z-axis laser system is a true through- the-lens technology that’s specifi c to OGP’s Quest line of CMMs, said Rose. It’s capable of measuring areas on parts where light might be obscured when using triangulation sensors. And its special laser interferometer makes it more accurate and less prone to error on rough or shiny surfaces. The TeleStar Plus’ larger working distance gives it the ability to probe as deeply as about 20 cm with 2 µm accuracy into, for example, an orthopedic implant with a deep well, without crashing into the part.


Two for One


In February 2014, Leica Microsystems (Wetzlar, Germany) came out with its DCM8, a two-in-one machine that com- bines high-defi nition confocal microscopy for lateral resolu- tion up to 140 nm with interferometry for vertical resolution up to 0.1 nm. Switching between the two modes is easy, and reportedly takes just one click of a mouse. A year later, Leica added focus variation with integra- tion to the DCM8, which overcomes limited depth of fi eld. By moving the workpiece stage vertically, the machine acquires images at different DoVs, and then determines the plane with the best focus to get a sharp image. This technology is useful for measuring the roughness of medi- cal devices with steep angles, such as tooth implants and artifi cial joints, and for verifying the authenticity of pharmaceuticals.


The utility of the new, dual technol- ogy becomes apparent when a manu- facturer’s metrology specialist needs to analyze a metal stent coated with a transparent polymer, for example. The confocal microscope, with its capacity to measure slopes, is used to analyze the roughness on the stent’s curved metal surface, while the interferometer can be better for analyzing the thick- ness of the polymeric coating. “The idea of taking both technologies is to combine the advantages of both worlds,” said Oscar Rodriguez Carballo, applications manager for Leica’s material sciences division in Europe. The optical microscope can also be used for brightfi eld and darkfi eld scanning.


Mitutoyo’s Points from Focus software “stitches” X, Y and Z-axis images together to build a 3-D topographic map or point cloud.


“It’s a fi rst-of-its-kind not necessarily specifi c to the medi- cal industry,” said Rose. “It’s really given us a lot of fl exibility with applications that we’d not been able to do before.” Added Groff, “These parts that we measure are getting


more and more complicated, with advanced geometric di- mensioning and tolerancing callouts. If your software doesn’t know how to accommodate that, you’re prone to measure- ment error.”


In addition to the different technologies for observation and analysis, the DCM8 is an instrument


for accurate color documentation of samples. It offers true-to-life color images by combining high-quality Leica objectives, a charge-coupled device camera, and four LED light sources—blue (460 nm), green (530 nm), red (630 nm), and white (centered 550 nm). The money-saving LEDs are a fi rst for Leica. The camera’s fi eld of view ranges from 14,032 × 10,560 µms at 1.25× magnifi cation to 117 × 88 µm at 150× magni-


42 — Medical Manufacturing 2015


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