Figure 2 | Scientific Reports

Figure 2

From: Low-cost prototyping of nitinol wires/frames using polymeric cores and sacrificial fixtures with application in individualized frames anchoring through the atrial septum

Figure 2

Miniaturized NiTi springs fabricated copper hypotubes yielding nitinol springs with diameters 1.1 mm in (a-1) a coil of copper/NiTi structure, (a-2) heat treated, and (a-3) released by etching. Another spring with diameter 0.75 mm is formed in (b-1) a coil of copper/NiTi that is (b-2) heat treated, (b-3) is gradually etched in ammonium persulfate solutions, and is (b-4) fully released. (c) SEM image of another spring with OD ~ 0.7 mm.

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