HDPE Casing?
The big challenge with HDPE coating implants seems to be deposition and securing it in realistic quantities; has anyone considered 3d printing? What about printing an HDPE sheath around a magnet? The bulk would be considerable but the bioproofing couldn't be beat.
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(From what I understand you can't 3D print around an object, I could be wrong though.)
"Printer resolution describes layer thickness and X-Y resolution in dpi (dots per inch), or micrometres. Typical layer thickness is around 100 µm (250 DPI), although some machines such as the Objet Connex series and 3D Systems' ProJet series can print layers as thin as 16 µm (1,600 DPI).[16]
X-Y resolution is comparable to that of laser printers. The particles
(3D dots) are around 50 to 100 µm (510 to 250 DPI) in diameter."