When over heads etc give you labour costs of about £40 an hour and just raising an order costs £30 it is not cost effective to repair/PPM some equipment (TENS, sphygmomanometers etc).
If costs are driven down then other items could also come under this category.
I remember when pulse oximeter finger probes were over £360 pounds each (mind you the old Kontron ones lasted much longer than any of the current ones); now you can get probes for less than £100.
Lee