see following for prior discussions on this item.Currently Devices includes supplies such as dresssings, bandages, and similar items, but to be clear and avoid confusion with the Substance resource, there is a distinction between a Device and a Substance. Note also that the Supply Resource was removed and replaced by the "act" resources SupplyDelivery and SupplyRequest which more accurately reflect its original intent. This also eliminates the confusion about these kinds of "disposable" or "bulk" devices and the earlier Supply" resource.