bong,
You need to decide where the "instrument curator" function in your hospital lies.
These are the guys who would traditionally look after this type of kit.
Depending on the organisation it may lie with CSSD / TSSU, EMBE, Estates. Or be managed from outside.
Get that sorted and it will sort who looks after the kit. That said if nobody currently has the responsibility then you will need to argue that you dont have time to do it and evidence why (workload etc).
Its hard to argue the financial : time ratio on these items as for example if its a chest retractor that costs a couple of hundred and you need to open someones chest today then its the most important bit of kit regardless of cost : time. Unless you have a job thats s o important on thats it negates the need to help the chest patient.
If they are already giving money to someone else then that budget needs transferring to EMBE if you can get out of doing it.
Dont know what you financial situation is but doing more with the same or less is the current methodology here.