Patent attributes
A catheter has a proximal portion of relatively larger central lumen diameter and outer diameter, and a distal portion of relatively smaller central lumen diameter and outer diameter, the two portions being integral with one another so that cells delivered into the central lumen of the proximal portion will flow through and exit the central lumen of the distal portion, encountering a constriction at the junction of the two portions, for infusion into body tissue at a predetermined target site when the catheter is inserted into a designated natural body vessel or duct leading to the target site. The cells are delivered in a fluid under pressure through a central lumen of the catheter to exit distally from the lumen at the target site, and meander of exiting fluid pressure from a predetermined value is minimized by adjusting the fluid pressure at the point of entry into the catheter's central lumen accordingly.
