Patent ID: 7927305

Claim:
A system for delivering a contrast medium, comprising: a delivery device, including: a guidewire lumen and a contrast injection lumen, the contrast injection lumen having a proximal end configured to receive a contrast medium and an open distal end configured to deliver a contrast medium to a treatment site within a blood vessel, the guidewire lumen and the contrast injection lumen commonly terminating at the distal end and being at least partially conjoined so as to provide axial rigidity to the delivery device; and a portable injector device in fluid communication with the contrast injection lumen, the portable injector device including: an injector body configured to contain a quantity of the contrast medium; a plunger disposed within the injector body; a pressure generator including a compressed gas reservoir, and a biasing member comprising a spring configured to move the plunger in a proximal direction within the injector body.