15:12 Jun 16, 2011 

I don't have enough context to know if this is correct collocation, but in the U.S., the term "on-demand medical care" or "on-demand medical attention" is used to refer to medical care provided outside of a patient's established primary care arrangement or hospital-based emergency department services, for example, for travellers away from home who need medical care on a "drop-in" basis, without a previous appointment, etc.