Eluting coils and methods of deploying and retrieving

A method of deploying an eluting coil, comprising:

• providing an eluting coil for deployment within a body of a patient, including:
• a resilient elongate element including a flattened ribbon-like configuration, a first surface, a second surface, a pre-stressed non-coiled configuration in a restrained state that ensures contact between the first surface and second surface in adjacent sections of the elongate element when the elongate element in a coiled configuration in a relaxed state with the first surface disposed adjacent the second surface in an overlapped portion of the elongate element;
• at least one dissolvable agent reservoir disposed on the elongate element in a position that is contained from an outside portion of the eluting coil when the elongate element is in a relaxed coiled configuration;
• and
• structure on the first surface configured to form at least one conduit between inside the first and second surfaces of adjacent sections of the elongate element in a coiled configuration, the at least one conduit including a pre-determined cross section and being in fluid communication between the contained dissolvable agent reservoir and an outside portion of the coiled configuration of the resilient elongate element in the relaxed state;
• disposing the resilient elongate element of the eluting coil in a restrained state;
• disposing a distal end of an elongate delivery member adjacent a target site within a patient's body;
• moving the resilient elongate element along the elongate delivery member and deploying the resilient elongate element from a distal end of the elongate delivery member;
• and
• allowing the resilient elongate element of the eluting coil to achieve a relaxed coiled configuration and form the at least one conduit and contain the at least one agent reservoir between the first surface and second surface of adjacent sections of the elongate element.

A method of retrieving an eluting coil, comprising:

• providing an eluting coil deployed within a body of a patient in a relaxed coiled configuration, the eluting coil including:
• a resilient elongate element including a flattened ribbon-like configuration, a first surface, a second surface, a pre-stressed non-coiled configuration in a restrained state that ensures contact between the first surface and the second surface in adjacent sections of the elongate element when the elongate element is in a coiled configuration in a relaxed state with the first surface disposed adjacent the second surface in an overlapped portion of the elongate element,
• at least one dissolvable agent reservoir disposed on the elongate element in a position that is contained from an outside portion of the eluting coil when the elongate element is in a relaxed coiled configuration,
• structure on the first surface configured to form at least one conduit between first and second outside surfaces of adjacent sections of the elongate element in a coiled configuration, the at least one conduit including a pre-determined cross section and being in fluid communication between the contained dissolvable agent reservoir and an outside portion of the coiled configuration of the resilient elongate element in the relaxed state, and
• a tail member disposed at an end of the resilient elongate element configured to facilitate removal of the eluting coil after deployment thereof;
• advancing a retrieval device into a patient's body until a distal end of the retrieval device is disposed adjacent the eluting coil;
• coupling a retraction element of the retrieval device to the tail member;
• and
• withdrawing the resilient elongate element into the retrieval device.