Schneider R M, Fornes R E, Stuckey W C, Gilbert R D, Peter R H
Cathet Cardiovasc Diagn. 1983;9(2):197-207. doi: 10.1002/ccd.1810090212.
An undated Cordis Ducor polyurethane coronary catheter fractured and separated in the aortic arch during a cardiac catheterization, and was removed with an intravascular retriever. The recovered specimen appeared brittle, prompting an investigation of the effects of aging on the tensile strength of 91 polyurethane catheters manufactured by Cordis and the United States Catheter and Instrument Company (USCI). Cordis catheters have stable tensile strength for five years from manufacture, but then deteriorate substantially by seven years, particularly at the bond between the catheter tip and the stainless steel-reinforced catheter body. The deterioration is associated with the microscopic appearance of deep cracks in the catheter lumen wall. USCI catheters showed a modest but significant loss of tensile strength by three years after manufacture at the catheter bond. It would seem prudent to place a three-year expiration date on USCI polyurethane catheters, similar to those already on Cordis catheters.
一根未标明日期的科迪斯·迪科尔聚氨酯冠状动脉导管在心脏导管插入术期间于主动脉弓处发生断裂并分离，随后用血管内回收器将其取出。回收的标本显得很脆，这促使人们对老化对科迪斯公司和美国导管与器械公司（USCI）生产的91根聚氨酯导管拉伸强度的影响展开调查。科迪斯导管自生产起五年内拉伸强度稳定，但到七年时会大幅下降，尤其是在导管尖端与不锈钢增强导管主体之间的连接处。这种劣化与导管内腔壁上出现的深层微观裂缝有关。USCI导管在生产三年后，其连接处的拉伸强度出现了适度但显著的损失。给USCI聚氨酯导管设定三年的有效期似乎是谨慎之举，类似于科迪斯导管已有的有效期规定。
