ISO 22675

TESTING OF ANKLE-FOOT DEVICES AND FOOT UNITS

At STEP Lab, we manufacture biomedical test equipment to subject your medical devices to a wide range of tests according to worldwide standards and regulations, such as ISO 22675.

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WHAT IS ISO 22675?

ISO 22675 is an International Standard that defines the test methods for ankle-foot devices and foot units. It provides two test procedures, one cyclic, designed for ankle-foot devices used in external lower limb prostheses, and one static. The loading conditions are characterized by standardized formats of loading and locomotion profiles, and each sample of device is free to develop its individual performance under load. By subjecting these devices to rigorous testing, ISO 22675 establishes performance requirements for strength, durability, and service life.

ISO 22675 – Test Setup

ISO 22675 – Test Graphs

ISO 22675 – CYCLIC TEST

The cyclic test outlined in ISO 22675 plays a crucial role in evaluating the functionality of ankle-foot devices. It assesses their ability to withstand the forces and stresses encountered during normal walking. By subjecting the devices to simulated real-life loading conditions, the test helps ensure that they meet the necessary performance standards.

This test, utilizing a pulsating test force and tilting angle, simulates the loading conditions of the complete stance phase of walking and verifies the strength, durability, and service life of the devices. Each loading condition generates compound loadings that simulate walking and other single events of loading. The test applies to ankle-foot devices and foot units of any size by establishing a relationship between the position of the top load application point and foot length.

For the cyclic fatigue test, the specified number of cycles is 2×10^6.

ISO 22675 – STATIC TEST

In addition to the cyclic test, ISO 22675 also covers a test procedure for a static test. This test includes a static proof test and a static ultimate strength test and generates heel and forefoot forces conforming to the conditions of the cyclic test.

By conducting these tests, manufacturers can verify the strength and durability of ankle-foot devices under extreme loads.

TESTING MACHINES FOR ISO 22675

Our EA dynamic and fatigue testing machine is a versatile solution for conducting tests that require high accuracy and speed in both force and position control.