An angiographic injector system includes a manifold and valve which selectively connects either a syringe pump or a low pressure system to a catheter which is inserted into a patient. The valve is normally biased to a state which connects the low pressure system to the catheter for pressure-monitoring,...http://www.google.es/patents/US6656157?utm_source=gb-gplus-sharePatente US6656157 - Infinitely refillable syringe
