• Anesthesia and analgesia · Dec 2004

    Comparative Study

    The mechanical properties of continuous spinal small-bore catheters.

    • Engelbert Deusch, Justus Benrath, Lukas Weigl, Konrad Neumann, and Sibylle A Kozek-Langenecker.
    • Department of Anesthesiology and Intensive Care-B, Vienna Medical University, General Hospital Vienna, Waehringer Guertel 18-20, A-1090 Vienna, Austria, E.C. engelbert.deusch@meduniwien.ac.at
    • Anesth. Analg. 2004 Dec 1;99(6):1844-7, table of contents.

    AbstractContinuous spinal anesthesia (CSA) has a nearly 100-yr history. In situations of difficult removal of a CSA small-bore catheter, mechanical properties of the different catheters might be important, because breakage could occur. We compared 5 different CSA small-bore catheters, 22- to 28-gauge from 3 manufacturers, for tensile strength, tensile stress, distension, and yield strength. Maximal tensile strength is the force applied before breakage of the catheter. The material characteristics of different CSA small-bore catheters for maximal tensile strength were: 22-gauge = 29.56 +/- 1.56 (mean +/- sd) Newton (N), 24-gauge = 16.77 +/- 1.61 N, 25-gauge = 9.20 +/- 0.48 N, 27-gauge = 4.61 +/- 0.25 N, 28-gauge = 5.07 +/- 0.59 N at room temperature. A strong correlation between maximal tensile strength and the outer diameter (r = 0.957, P < 0.001) and maximal tensile strength and the wall thickness (r = 0.9, P < 0.001) was observed. Although extrapolation from experimental studies to clinical routine should be made with care, our data suggest that catheters with higher-strength characteristics may reduce the risk of catheter breakage in patients, although clinical correlations are lacking.

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