Patent ID: 8083722

Claim:
A needle for injecting therapeutic fluid into a target space, the needle comprising: one or more elongated tissue-penetrating members for penetrating into a target space; at least one extraction orifice located on said one or more tissue-penetrating members; an extraction fluid path in fluid communication with said at least one extraction orifice; at least one injection orifice located on said one or more tissue-penetrating members and positioned remotely from said at least one extraction orifice; an injection fluid path in fluid communication with said at least one injection orifice; wherein the number of extraction and injection orifices, their size, and their position relative to each other are selected to create a pressure gradient within the target space when a therapeutic fluid is injected through the at least one injection orifice; a manifold having a manifold cavity wherein said one or more elongated tissue-penetrating members are attached to said manifold, said manifold cavity further comprising an internal wall configured to form a chamber within that is not in fluid communication with said manifold cavity, and a connector having a connector opening in fluid communication with said chamber and configured to allow delivery of a medical agent into said chamber without coming in fluid communication with said manifold cavity.