Non-medical Device Design
FeverTags cattle health monitoring device:
There were quite a few "knowns" about this design.
The second big need was for Design for Manufacture, and a very sturdy union of parts strong enough for outdoor conditions.
But the first need was to design:
...a motion limiter to protect the cattles' ear.
...a tamper-resistant feature to detect unauthorized moving of tags between cattle.
(illustrations used with permission)