Abstract: Methods and devices for introduction of an agent to a vascular physiological site are provided. Aspects of the methods include employing an agent delivery device and an aspiration device to introduce and remove agent from a vascular site in a manner sufficient to minimize agent loss. Also provided are systems and kits for performing the subject methods. The subject invention finds use in a variety of different applications.

Abstract: Methods are provided for locally administering an agent to a host. Specifically, the subject methods provide for the local administration of an agent to an interstitial space of a host. In the subject methods, an agent is retroinfused into a vessel of a host, typically a vein, under conditions sufficient for the agent to enter an interstitial space of the host proximal to the vessel location into which the agent is retroinfused. In practicing the subject methods, the agent is administered to the host in combination with the production of vascular stress at the site of administration, where the vascular tissue stress is sufficient to provide for transport of the agent from the vascular site of deposition into the target interstitial space. In a preferred embodiment, the agent is retroinfused at a pressure sufficient to provide for mechanical stress on the vessel proximal to the target interstitial space. Also provided are kits for use in practicing the subject methods.