ISO 24415-2:2011

Overview

ISO 24415-2:2011 is an international standard developed by ISO that defines requirements and test methods for the durability of tips for crutches, a crucial component of assistive products for walking. This standard focuses on ensuring the safety, reliability, and cost-effectiveness of crutch tips under typical usage conditions on dry, flat surfaces. It excludes tips designed for special environments such as ice or snow. By providing a consistent framework to assess durability, ISO 24415-2:2011 helps manufacturers, distributors, and healthcare providers evaluate whether crutch tips meet necessary performance standards for everyday use.

Key Topics

• Durability Testing Requirements
  The standard specifies detailed criteria for evaluating the condition of crutch tips after testing. Tips must show no visible tears, no exposure of inner parts, and must remain properly fixed throughout the test.

• Test Methods
  ISO 24415-2 outlines a rigorous test procedure that simulates the dynamic loading and motion of crutch tips during normal walking gait.
  Key test components include:

  • A test device with a loading rod, actuator, and motion control that applies a dynamic axial load up to 500 N.
  • A test track made of concrete with specific frictional characteristics (greater than 80 BPN based on EN 13036-4).
  • A loading force mechanism that replicates the pressure and tilt variations experienced by tips during walking.
  • A motion control system to apply tilt angles between -20° and +20°.
    The test cycles are repeated 500,000 times at a frequency below 0.8 Hz to simulate extended use.

• Test Environment
  Testing must be conducted at a stable temperature of 23±2 °C with pre-test preparation including cleaning and conditioning of the tips.

• Test Reporting
  The standard mandates thorough documentation, including manufacturer and supplier information, classification codes, physical characteristics of the tips pre- and post-test, photographs, test conditions, and confirmation of compliance with durability requirements.

Applications

ISO 24415-2:2011 applies specifically to the evaluation of tips used on elbow crutches, forearm support crutches, and axillary crutches as classified in ISO 9999. It ensures that the tips are durable enough for everyday walking on regular surfaces, thereby enhancing user safety and product longevity. This standard is essential for:

• Assistive device manufacturers seeking to validate product durability and quality.
• Product testing laboratories conducting standardized durability assessments.
• Healthcare providers and distributors evaluating the suitability of crutch tips for patient use.
• Regulatory bodies setting safety and quality benchmarks for mobility aids.

This focus on durability helps reduce the risk of accidents caused by worn or damaged tips, contributing to improved user confidence and reducing the frequency of replacements, which impacts cost-effectiveness over time.

Related Standards

• ISO 24415-1:2011 – Tips for assistive products for walking - Part 1: Friction of tips
  Complements Part 2 by setting requirements and test methods related to the slip resistance of tips to enhance safety.

• ISO 9999 – Assistive products for persons with disability - Classification and terminology
  Provides classification codes that are referenced in ISO 24415-2 to define the types of crutches covered.

• EN 13036-4 – Road and airfield surface characteristics - Test methods - Part 4: Measurement of slip/skid resistance
  Defines the friction measurement method applied to the test track surface in ISO 24415-2 durability tests.

Summary

ISO 24415-2:2011 plays a pivotal role in ensuring that crutch tips for assistive walking devices exhibit the necessary durability to withstand repeated dynamic loading during daily use. By standardizing test methods and durability requirements, it supports the production of safer, reliable, and cost-effective assistive products. Compliance with this standard aids manufacturers and healthcare professionals in maintaining high safety standards and enhancing user trust in mobility assistance devices.