The mechanical properties of intact and traumatized epidural catheters

Ates, Y
Yucesoy, CA
Unlu, MA
Saygin, B
Akkas, N
Comparative data on the mechanical properties of epidural catheters used clinically are not available. We performed a controlled laboratory investigation to assess the mechanical performance of three different intact or traumatized catheter types (Polyurethane, clear nylon, and radiopaque nylon catheters, designed for 18-gauge Tuohy needles). We studied a control (intact) and two trauma groups (needle bevel and surgical blade). Catheters were loaded to their breaking points by using a Lloyd LS500 material testing machine (Lloyd, Southampton, UK). Maximal load and extension values before breakage were measured, and modulus of elasticity and toughness values were calculated. Intact polyurethane catheters did not break within the limits of the experimental study (extension up to 3 times the original length of a specimen). The toughness values obtained from polyurethane and clear nylon catheters were significantly higher than those for the radiopaque catheters in intact specimens (P < 0.05). In the traumatized groups, polyurethane catheters had the highest toughness values (P < 0.05). Modulus of elasticity values were higher in both control and trauma groups of the radiopaque catheters when compared with the polyurethane and clear nylon catheters, which indicates a higher stiffness to elastic deformation (P < 0.05). In conclusion, polyurethane catheters are the most durable catheter type to tensile loading, either intact or traumatized. Mechanical properties can be used to predict complications related to the clinical use of these catheters. Implications: Using a computer-assisted material testing machine, we studied the mechanical properties of three different types of epidural catheters, either intact or traumatized, in a blinded, controlled study. This information may be vital to clinicians who implant epidural catheters by helping them choose a catheter that has the lowest probability of failure.


The evaluation of radiofrequency facet nerve denervation in the patients with lumbar facet syndrome: experience with 493 patients
Mimaroglu, Caner; Mimaroglu Altinay, Beste; Duger, Cevdet; Isbir, Ahmet Cemil; Gursoy, Sinan; KAYGUSUZ, KENAN; Kol, Iclal Ozdemir (2017-12-01)
Objective: Radio frequency thermocoagulation (RFT) is a relatively new modality and has been recommended for treatment of back pain diagnosed as to be originating from spinal facet joints. We aimed to evaluate the efficacy of this novel procedure in our patients with lumbar facet syndrome in our department of algology.
Untargeted metabolomics profiling of skeletal muscle samples from malignant hyperthermia susceptible patients
Bojko, Barbara; Vasiljevic, Tijana; Boyacı, Ezel; Roszkowska, Anna; Kraeva, Natalia; Moreno, Carlos A. Ibarra; Koivu, Annabel; Wasowicz, Marcin; Hanna, Amy; Hamilton, Susan; Riazi, Sheila; Pawliszyn, Janusz (Springer Science and Business Media LLC, 2021-01-01)
Purpose Malignant hyperthermia (MH) is a potentially fatal hypermetabolic condition triggered by certain anesthetics and caused by defective calcium homeostasis in skeletal muscle cells. Recent evidence has revealed impairment of various biochemical pathways in MH-susceptible patients in the absence of anesthetics. We hypothesized that clinical differences between MH-susceptible and control individuals are reflected in measurable differences in myoplasmic metabolites. Methods We performed metabolomic profil...
KOKSOY, C; KUZU, A; ERDEN, I; Akkaya, Ayşen (Wiley, 1995-11-01)
Catheter-related venous thrombosis is one of the most important complications of central venous catheters. The aim of this prospective study was to assess the risk factors that may be important in the development of catheter-related thrombosis. Multiple lumen (n = 20) and single lumen (n = 24) polyurethane catheters were inserted to the subclavian vein by the infraclavicular approach in 44 consecutive patients. All variables that may be significant for the development of thrombosis related to the patient, t...
Computer simulation of the human leg subjected to impact loading
Wang, XS; Turgut, TS; Nuri, A (SAGE Publications, 2003-01-01)
One of the most important tasks in clinical practice is to determine accurately the forces and displacements of the various anatomical structural components of the human leg, especially when subjected to impact loading. This paper therefore develops a computer simulation which describes the biodynamic response of the human lower extremity for realistic activities such as kicking by foot etc. Firstly, the paper derives the nonlinear equations of motion and nonlinear constraint equation governing the sagittal...
The effect of different solvents on the performance of zeolite-filled composite pervaporation membranes
Sener, Tansel; Okumus, Emin; Gurkan, Turker; Yılmaz, Levent (2010-10-15)
The aim of this research is to study effect of different solvents on the membrane morphology and on the performance of zeolite-filled composite pervaporation membranes. PAN (polyacrylonitrile) was used as a base polymer and zeolite 13x (32 wt.%) was used as the filler. The solvents considered were DMF (dimethyl formamide), DMSO (dimethyl sulfoxide), DMAc (dimethyl acedamide) and THF (tetrahydrofuran). The cross-sectional morphology of manufactured membranes shows three layers: a zeolite-free polymer layer, ...
Citation Formats
Y. Ates, C. Yucesoy, M. Unlu, B. Saygin, and N. Akkas, “The mechanical properties of intact and traumatized epidural catheters,” ANESTHESIA AND ANALGESIA, pp. 393–399, 2000, Accessed: 00, 2020. [Online]. Available: