Power injection of microcatheters: an in vitro comparison.

Brown DB, Papadouris DC, Davis RV, Vedantham S, Pilgram TK
J Vasc Interv Radiol. 2005 16 (1): 101-6

PMID: 15640416 · DOI:10.1097/01.RVI.0000141718.12025.2C

PURPOSE - To determine the tolerance of 0.021-inch and 0.027-inch microcatheters to power injection in an in vitro flow model.

MATERIALS AND METHODS - Twenty-four microcatheters (0.021-inch, n = 13; 0.027-inch, n = 11) were injected with iothalamate meglumine through a flow model with use of a power injector and high-pressure tubing. Catheters used included Rebar (0.021-inch, n = 4; 0.027-inch, n = 4), Transit (0.021-inch, n = 3; 0.027-inch, n = 3), Renegade (0.021-inch, n = 4; 0.027-inch, n = 4), and Renegade STC-18 (0.021-inch, n = 2) models. Through the 0.021-inch microcatheters, 5-second injections were performed at an initial rate of 0.7 mL/sec. Injection rates were increased by 0.5 mL/sec and the process was repeated until the pressure approached 1,000 psi or catheter breakage occurred. A similar process was repeated for the 0.027-inch catheters starting at a rate of 3.4 mL/sec.

RESULTS - The 0.021-inch catheters were injected 303 times and the 0.027-inch catheters were injected 210 times. Three catheter failures occurred, with all breaks occurring at pressures greater than manufacturer recommendations. The 0.027-inch catheters as a group tolerated significantly higher injection rates than the 0.021-inch catheters. Of the 0.021-inch catheters, the STC-18 also provided superior maximum flow and volume compared with the Renegade catheter. The Rebar catheter tolerated significantly lower maximum injection rates and volumes than the other 0.027-inch catheters.

CONCLUSIONS - The majority of microcatheters can be power-injected in vitro at pressures far greater than manufacturer recommendations. When fractures occur, they are near the hub of the catheter. Significantly greater rates of injection are possible through 0.027-inch catheters.

MeSH Terms (11)

Catheterization Contrast Media Equipment Design Equipment Failure Analysis Humans Injections Iothalamate Meglumine Materials Testing Miniaturization Pressure Stress, Mechanical

Connections (1)

This publication is referenced by other Labnodes entities: