These symbols and icons below have an interesting design style. They use minimal detail but identifiable features such as loudspeakers etc to convey the message. Well that is pretty self-explanatory, it would be a good idea convey icon and symbol design into this project.
If doing a website that can be viewed on mobile platforms as well as home computers it may be wise to inject some personality into the icons or symbols to grab attention more in a anxious situation?
Like some altered x-rays to show where the injury is for one instance.
Interesting idea for an advert above with the ice pack.
Maybe use humour; even if injury is no laughing matter it would act as a useful distraction for people panicking or having anxiety attacks I guess.
Useful instructions will be needed too of course as shown above.