Patent ID: 6893429

Claim:
A catheter for delivering a therapeutic agent to a selected site within an organism, the catheter comprising, in combination: a solid non-porous catheter tip; and a tubular section having a proximal end and a distal end, the tubular section defining a lumen, the solid non-porous catheter tip inserted into the lumen and attached to the distal end of the tubular section, the tubular section comprising solid sections and a microporous membrane section, the microporous membrane section comprising, a first end and a second end, the first end and second end coupled to the solid sections forming a continuous cross section of the tubular section, the tubular section having a substantially uniform inner and outer diameter along the length thereof wherein the catheter is configured to allow the therapeutic agent to fill the lumen until a predetermined lumenal pressure exceeding the external pressure of the selected site is reached and the microporous membrane section is configured to deliver the therapeutic agent at the predetermined lumenal pressure.