I also do non-medical projects, such as this agricultural electronic sensor.

The Arrow LVAD (Left Ventricular Assist Device) power management module, explode view.    

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)

NOTE:  Images used with permission.