| 摘要 |
A tunneler ( 100,800 ) having a shaft ( 102,802 ) with an advancement end ( 106 ) and a connection end portion ( 104,804 ) having a lumen insertion tip ( 108,806 ) that may define a locating pin. At least one lumen-gripping section ( 120,818 ) is defined on the connection end portion spaced from the lumen insertion tip ( 108,806 ). The lumen-gripping section may be a barb section having at least one discrete barb ( 120 ) with a sharp lumen-biting edge and a tapered lead-in surface ( 128 ) extending from the sharp edge toward the locating pin. The barb section ( 120 ) may have one discrete barb, or it may have an array of discrete barbs ( 124 ) disposed equiangularly around the circumference of the connection end portion, with interbarb surfaces ( 126 ) that may be flat or fluted. The barb section ( 620 ) may be semi-cylindrical in cross-section for use with catheter lumens that are semi-cylindrical or D-shaped. Also, the lumen-gripping section ( 818 ) may be an annulus having a rounded lumen-engaging surface, or may be a circumferential array of nubs having rounded lumen-engaging surfaces. The connection end portion may have a plurality of axially spaced lumen-gripping sections ( 220,230;818 ) that may have the same diameters or different maximum dimensions for use with a range of sizes of catheter lumens.
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