The key point here is to differentiate between health/safety issues and commercial issues.
There may be rare cases where provision of spare parts is important for safety, but in general it is just a commercial issue: maintenance and repair takes place well away from the clinical environment.
Many may assume that even so, healthcare agencies should be given protection because of the large potential impact: making a $100,000 machine useless after 2 years.
But regulations tend to take the view that for commercial matters, professionals should look after themselves. If you buy a $100,000 machine, put it in the contract that spare parts must be available for 5 years. Didn't put it in the contract? Bad luck.
In Europe, for example, the warrantee directive 1999/44/EC gives 2 years protection to consumers, but a consumer is defined as someone not involved in professional activities. Professionals are left to look after themselves.