A rubber band with a steel hook sits attached under the wheelchair. The user uses a bungee cord with steel hooks. User opens zipper on trousers, inserts the hook in his underpants and trousers so they are pulled away from his body, and the user can performe intermittent self-catheterisation (ISC).
In Sweden for example bicycle shop or clasohlson.com (last checked July 2020).
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This tip is from 2007