Table 1 Three types of springs were fabricated using steel mandrels and their dimensions are characterized.

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

Mandrel type (needle)

Spring outside diameter (mm)

Intended diameter (mm)

Pitch (mm)

Wire diameter (microns)

No. tested

Gauge 27

0.67 ± 0.01

0.696

0.32 ± 0.02

72 ± 2

3

Gauge 21

1.09 ± 0.04

1.128

0.30 ± 0.01

73 ± 2

3

Gauge 16

1.87 ± 0.06

1.915

0.35 ± 0.02

73 ± 1

3

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