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Express measurement of large components

Inter­nal geo­me­tries can usual­ly only be mea­su­red with dif­fi­cul­ty or not at all by opti­cal and tac­ti­le devices. In such cases, CT helps with the CAD target/actual comparison.

In order to make the devia­ti­ons of the CAD model visi­ble even with lar­ge com­pon­ents, Micro­vis­ta uses par­ti­cu­lar­ly lar­ge & modern com­pu­ter tomo­graphs. If the job has to be done quick­ly, an express opti­on can be sel­ec­ted. With this opti­on, the order is prio­ri­ti­sed in the pro­cess. An online inspec­tion report pro­vi­des access to the results in the form of 3D fal­se colour images direct­ly after the eva­lua­ti­on. This enables par­ti­cu­lar­ly fast initi­al sam­ple inspec­tions and con­tract measurements.

CAD Soll-Ist-Vergleich eines Bauteils

CAD target/actual com­pa­ri­son of an alu­mi­ni­um component

Practical example: target/actual comparison of a hand prosthesis

The challenge

Hand pro­s­the­ses are medi­cal aids that make life easier for peo­p­le with an ampu­ta­ti­on. In addi­ti­on to a natu­ral look, the pro­sthe­sis should be pre­cis­e­ly adapt­ed to its wea­rer to enable natu­ral move­ment pat­terns. For exam­p­le, a dri­ve helps to rea­li­se grip strength and gras­ping move­ment. A thumb dri­ve pro­vi­des for the exe­cu­ti­on of other hand posi­ti­ons. With so much atten­ti­on to detail, it is easy for the pro­sthe­sis to go wrong.

Possible consequences

Defec­ti­ve pro­s­the­ses can cau­se dama­ge to other parts of the body, such as the should­er joint. This dama­ge can make it dif­fi­cult to re-implant the pro­sthe­sis or, in the worst case, even make it impos­si­ble to use a new pro­sthe­sis. The­r­e­fo­re, the (hand) pro­sthe­sis should defi­ni­te­ly be che­cked for defects.

Hand pro­sthe­sis

Advantages of the CT scan

The target/actual com­pa­ri­son of a hand pro­sthe­sis enables a non-des­truc­tively pro­du­ced digi­tal image of the actu­al sta­te of the medi­cal device. A 3D image of the object is gene­ra­ted by cap­tu­red data sets and direct­ly shows geo­me­tric dif­fe­ren­ces to the tar­get sta­te. For sub­se­quent eva­lua­tions and mea­su­re­ments, the hand pro­sthe­sis (or ano­ther object) is not requi­red again; the stored data records are suf­fi­ci­ent to car­ry out fur­ther analyses.