Patent ID: 7108674

Claim:
A bolus for a blood vessel catheter, comprising: a) a generally cylindrical body molded of resilient plastic and including a rear connector section, a front nose section and an intermediate passage section arranged in axially aligned relationship; b) said intermediate passage section containing first and second axially extending passages having a septum therebetween, said first passage communicating with a first port opening radially out of said cylindrical body in said passage section, said second passage communicated with a second port opening radially out of said cylindrical body in said passage section; c) said septum being bowed in the direction of said first passage whereby said first passage has a substantially crescent-moon shape in cross-section; d) each of said ports having a trailing edge extending around a portion of the circumference of said bolus body; e) said front nose section having a rounded bullet nose; f) said second passage having one cross-sectional area adjacent said connector section and another cross-sectional area where it communicates with said second port, said other cross-sectional area being greater than said one cross-sectional area.