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Validation of a measurement system used for quality control of one-way reflective targets

Duin, E. van (2014) Validation of a measurement system used for quality control of one-way reflective targets.

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Abstract:This report explains the main steps taken to validate an optical tracking measurement system. Also the design of a tooth implant bending instrument and some calculations on the strength of the implant will be shown. A literature search about a short stem hip implant was done and a holder for rat implants was made. The internship was carried out at Medical Atesos AG, Aarau, Switzerland. The main assignment to be carried out was to validate a new optical tracking measurement system for quality control of optical reflective targets. This was done by using another already in use optical tracking measurement system. The key parts of these systems are the camera and the reference system. After measuring a significant amount of targets, it was concluded that a correlation could be found between the values found by both measurement systems. A limit value could be set at 2.70 (unfortunately, this new measurement system does not give values in millimetre as the current measurement system does). The camera measuring bandwidth was found to be good enough. Though, the system appeared to have a too big total measuring bandwidth. Also, measurements done under 50° appeared to have a mirroring effect of which it is not known how much effect it has on the measurements and values obtained for the targets measured. Recommendations consist of adjusting the measurement system in such manner that the reference system is totally fixed to where the targets should be placed, to put the camera under an angle of 50°, so that the targets can be horizontal and to have more distance between the targets measured since then the mirroring should definitely not have any effect on the measurements. Another project done was literature research for a short stem hip implant. The age with which people need a hip implant is declining. The main problems with this declining age of patients are the short lifetime of a hip implant and the higher activeness of these younger patients. A solution for these problems is a short stem hip implant which Atesos is planning to produce in the future and therefore literature had to be found. Another project was running to test a new anti-infection coating. To test this new coating hip implants for rats will be implanted in the rats at the University of Munich. For these implants, a holder was needed, by which the implant would be protected. Work has been done in the tool shop of Atesos to make these holders. Calculations were done and a design was made of an instrument for tooth implants. The conventional implants consist of two parts. This makes it more sensitive to infections. Therefore, Atesos together with a couple of other companies are developing a tooth implant consisting of only one part which has to be able to being bend, but which also has to be able to endure all normal forces when placed into a mouth. Calculations have been done on the bending force of this implant. An instrument has been designed to bend the implant for when the implant is already placed into a patient’s mouth for quite some time.
Item Type:Internship Report (Master)
Atesos, Switzerland
Faculty:ET: Engineering Technology
Subject:52 mechanical engineering
Programme:Mechanical Engineering MSc (60439)
Keywords:biomechanics, photogrammetry, optical active targets, hip implant, tooth implant, short stem hip implant, implant coating, implant coating
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