This assignment includes a development of a crutch approver that will test the physical strength of crutches. The project is assign by Johan Ljunger at Camatec Industriteknik AB located in Karlstad and is a bachelor thesis at Karlstad University and is performed during the spring term of 2017.

Today several counties in Sweden reject returned crutches that have been used by patients, because they can’t ensure the patients safety if the crutches were to be reused. The used crutches might be defective because of bad handling by former user and therefor lost its physical properties. It is because of this the counties want a safe method that could test these properties and declare if the crutches still is reusable.

These crutches are approved by ISO Standard 11334-1:2007 and if they were to be reused they have to be approved by this standard once again. This standard was studied and parts that are relative to this project are being presented in this report, as much as possible. Although it is necessary to obtain this standard to fully understand this report, because some content can only be obtained from the standard and not from this report.

Delimitations were made or else the project would have been too big to handle with the time that was available. It has been limited to only use one model of crutches, which is the most commonly used by the counties. It’s also limited to only preform this sort of test on crutches that are still within their lifetime, which is two years for the model that is used.

A construction that will test these crutches has been created by following the steps of product development. This machine will perform a static strength test on the crutches according to the standard, but it is not fully completed on certain parts. But it shows how a machine like this can be constructed and how it works. More ideas for further development on this machine are presented in this report.