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Force System with Vertical V-Bends: A 3D In Vitro Assessment of Elastic and Rigid Rectangular Archwires

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Different mechanical properties in Seldinger guide wires.

Wolfram Schummer¹

¹Department of Anesthesiology, Intensive Care and Emergency Medicine, SRH Clinic Suhl, Suhl, Germany.

Journal of Anaesthesiology, Clinical Pharmacology

|December 25, 2015

Summary

This summary is machine-generated.

Current guide wire testing standards do not reflect clinical needs. This study evaluated guide wire mechanical properties, recommending updated standards for improved patient safety and reduced complications during central venous catheter placement.

Keywords:

Central venous cannulation complications flexing/bending/kinking characteristics guide wire mechanical properties tensile strength

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Area of Science:

Medical Devices
Biomedical Engineering
Interventional Radiology

Background:

Central venous catheters are commonly placed using Seldinger guide wires.
Existing EN ISO 11070 standards for guide wire testing may not adequately represent clinical requirements.
Mechanical failures of guide wires can lead to serious complications.

Purpose of the Study:

To establish clinically relevant flexing performance requirements for guide wires.
To develop and apply new testing methods for guide wire mechanical properties.
To compare the mechanical performance of different guide wire constructions.

Main Methods:

In vitro testing of guide wire flexing performance and tensile strength in an accredited laboratory.
Development of flexing tests simulating clinical scenarios.
Tensile strength testing extended beyond EN ISO 11070 limits to determine failure points.
Comparison of monofil and core/coil guide wire constructions.

Main Results:

Most guide wires met the existing 5 N tensile strength requirement, with tested values ranging widely.
No wires kinked during flexing tests; monofil wires showed no bending, while some core/coil wires exhibited minor bending.
Significant bending angles (22.5°–43.0°) were observed in several guide wires, indicating potential for mechanical failure.

Conclusions:

Clinicians should prioritize guide wires with superior mechanical properties.
EN ISO 11070 standards should be updated to include kink-proof flexing tests and a minimum tensile strength of 30 N.
Mandatory disclosure of mechanical properties by manufacturers is recommended to ensure informed clinical selection.