The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 20, 1995
Filed:
Dec. 30, 1993
James C Wang, Norton, MA (US);
Boston Scientific Corporation, Watertown, MA (US);
Abstract
An infusion catheter including an elongated catheter body, and an infusion section at its distal end for delivery of therapeutic fluid to bodily passages. The infusion section includes an outer tube and an inner tube concentric with the outer tube, each tube having a multiplicity of ports therethrough. The inner tube delimits a central, fluid delivery lumen. The inner tube is uniformly spaced apart from the outer tube to provide an annular passageway, the radial depth of the passageway being sufficient to permit fluid flow therewithin. Each of the ports through the outer tube provides fluid communication between the annular passageway and the exterior of the catheter, while each of the ports through the inner tube provides fluid communication between the central lumen and the annular passageway. Thus, therapeutic fluid can flow from the central lumen through the annular passageway to the catheter exterior. The catheter provides a uniform average flow rate of therapeutic fluid along the length of the infusion section by (a) providing a higher ratio of inner tube ports to outer tube ports in the distal portion than in the proximal portion of the infusion section, and/or (b) positioning the inner tube ports and outer tube ports relative to one another so that the average fluid flow distance in the annular passageway between the inner tube ports and the outer tube ports is smaller in the distal portion than in the proximal portion of the infusion section.