| 摘要 |
This invention is an infusion catheter (10) including an elongated catheter body (12), and an infusion section (18) at its distal en d (16) for delivery of therapeutic fluid to bodily passages. The infusion sect ion (18, 60) includes an outer tube (32) and an inner tu be (38) concentric with the outer tube, each tube having a multiplicity of ports (48 , 50) there through. The inner tube (38) delimits a cent ral, fluid delivery lumen (42). The inner tube (38) is uniformly spaced apart from the outer tube (32) to provide an annular passageway (46), t he radial depth (44) of the passageway being sufficient to permit fluid flow th ere within. Each of the ports (50) through the outer tub e (32) provides fluid between the annular passageway (46) and the exterior of the c atheter, while each of the ports (48) through the inner tube (38) provides fluid between the central lumen (42) and the an nular passageway (46). Thus, therapeutic fluid can flow (52) from the central lumen through the annular passageway to the c atheter exterior.
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