I kind of disagree. Medical devices should be repaired by trained professionals using OEM parts only.
How’d you feel if your pacemaker’s battery started leaking acid into your body because Kevin from accounting had made a diy drone once and he found a good deal on AliExpress specials batteries.
Of course, that means manufacturers should be liable for any issues wrt lack of parts or available repairman.
When your hacked together CPAP sends asbestos directly into your lungs because Bob from maintenance had some spare time to fix it, you’ll be crying about malpractice.