Triolo P M, Andrade J D
J Biomed Mater Res. 1983 Jan;17(1):129-47. doi: 10.1002/jbm.820170111.
Double catheter systems consisting of a stiff outer catheter and a flexible, buoyant, flow-directed, inner catheter which is often balloon-tipped have been employed with increasing frequency recently in both therapeutic and diagnostic procedures. Their use, however, has been restricted because of the excessive friction generated between the two catheters. In an attempt to decrease friction between polymers commonly used as catheter materials, oxidation of polyethylene, fluorinated ethylene-propylene copolymer, poly(vinyl chloride), silicone rubber, and polystyrene surfaces was induced by exposing the polymers to radio frequency glow discharge (RFGD) in a helium environment. All polymers were surface characterized utilizing x-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and contact angle measurements before and after oxidation. This article describes the materials and methods used to fabricate and characterize the polymer surfaces and the results of the characterization. The results indicate that increases in oxygen concentration at the surface of the polymers and decreases in air-water contact angles occur with increased RFGD exposure time. Plateau values were usually obtained after 5-30 s exposure time, yet no apparent changes in surface topography were noted by scanning electron microscopy. The hydrophilic surfaces produced were stable for up to three months storage time in air.
由一根硬的外导管和一根柔软、有浮力、可随血流导向的内导管（通常带有球囊尖端）组成的双导管系统，最近在治疗和诊断程序中使用的频率越来越高。然而，由于两根导管之间产生的过度摩擦，其应用受到了限制。为了减少常用作导管材料的聚合物之间的摩擦，通过在氦气环境中将聚合物暴露于射频辉光放电（RFGD）来诱导聚乙烯、氟化乙烯 - 丙烯共聚物、聚氯乙烯、硅橡胶和聚苯乙烯表面的氧化。在氧化前后，利用X射线光电子能谱（XPS）、扫描电子显微镜（SEM）和接触角测量对所有聚合物进行表面表征。本文描述了用于制备聚合物表面并对其进行表征的材料和方法以及表征结果。结果表明，随着RFGD暴露时间的增加，聚合物表面的氧浓度增加，气 - 水接触角减小。通常在暴露5 - 30秒后达到平稳值，但扫描电子显微镜未观察到表面形貌有明显变化。所产生的亲水性表面在空气中储存长达三个月仍保持稳定。
