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Optical Inspection System for Implants

机译：用于植入物的光学检测系统

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Hip and knee prostheses are complex products with high quality standards. The aim is to reproduce the behavior of a natural joint. This can be achieved by using a hard and a soft component. The research project "Optical Geometry Acquisition of Medical Implants and Prostheses", short "OptiGIP", explores methods for an automated quality assurance included in the production chain of these components. The approach is divided in two sections, a three dimensional and a two dimensional measurement technique. First a stripe projection method is used to produce a three dimensional model of the component. This model can be used to verify the geometry of the component. Furthermore it enables a new examination method, the Model-Based RSA, which is used to explore the effect of loosening. A late loosening of the components within the bones is the most important quality criterion for a successful implantation. The second part of described measurement method aims at a reduction of an early loosening of the prosthesis. Even very small scratches on the prosthesis's surface can have an impact on an early loosening because of friction between the soft and hard surface. Scratches produce bigger particles of the soft component than an undamaged surface would do. Recent research activities show that these bigger particles have an influence on an early loosening mechanism. The two-dimensional measurement checks the quality of the surface of the hard component of the implant. The approach is to use an extended dark field method. The prosthesis is illuminated from various angles producing a sequence of images. These images are filtered to distinguish between reflections from scratches and direct reflections. A combination of the filtered images shows the scratches.
机译：臀部和膝关节假体是具有高质量标准的复杂产品。目的是重现自然关节的行为。这可以通过使用硬组件和软组件来实现。研究项目“光学几何采集医疗植入物和假体”，短“OPTIGIP”，探讨了这些组分生产链中的自动化质量保证方法。该方法分为两个部分，三维和二维测量技术。首先，STRIPE投影方法用于产生组件的三维模型。该模型可用于验证组件的几何形状。此外，它能够实现一种新的检查方法，基于模型的RSA，用于探索松动的效果。骨骼内部部件的晚期松动是成功植入的最重要的质量标准。所述测量方法的第二部分旨在减少假体的早期松动。甚至在假体的表面上的非常小的划痕可能会对早期松动产生影响，因为柔软和硬表面之间的摩擦。划痕产生比未损坏的表面更大的软组件颗粒。最近的研究活动表明，这些更大的粒子对早期松动机制有影响。二维测量检查植入物的硬部件的表面的质量。该方法是使用扩展的暗场方法。假体从产生一系列图像的各种角度照射。滤波这些图像以区分从划痕和直接反射的反射。滤波图像的组合显示了划痕。

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