Development of design and manufacturing technology of nitinol peripheral stents

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Supervisor:
Dr. Bognár Eszter
Department of Materials Science and Engineering

The objective of this thesis is to produce a peripherial nitinol stent for animal studies. The very small scale of the stent (Ø1,2 mm) makes the project different from usual engineering activities. We had to use special methods during cutting and aftercare because we can not handle the stent with regular tools. So we performed the production with laser micromachining, the removal of burrs with chemical etching and electropolishing. During these processes there is no mechanical connection with the workpiece so the compliacations caused by the scales can be eliminated.

The purpose was to design a stent model, experiment the optimal cutting parameters and cut the raw stent, which can be prepared for implanting by using different aftercare methods.

During implementation I first rewieved the theoretical fundamentals about stents, nitinol and laser. Using these and an available nitinol stent I made a 3D stent model and its unfold version which I planned to use during production. Then I performed cutting ex-periments on a nitinol tube, first with a simple model (tube segment), then more difficult models, finally with the stent pattern, which has been modified several times based on cut-ting experiences (it got more bridges, got shorter especially for the test cuts). As a result of the experiement series I determined an optimal group of parameters, and with its application I could produce the stent. The finished product got to the customer prepared for implanting, put into a branule.

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