Observation:
You are back from the hospital with a fractured wrist, arm, ankle or leg and a plaster cast. The cast has to stay on for several weeks and you must not get it wet! Problem : how do you keep yourself clean? Have you ever tried showering with one arm /leg out of the way of the water jet? Its almost impossible, and too much trouble. 
Suggestion:
The easiest solution is to have a protection similar to that of a shower cap, so that the plaster does not get wet. However, that is easier said than done. A simple contraption that can be made at home would involve wearing a plastic bag with a rubber band to hold it in place. However, there are chances that some water will still seep through. Brown Medicals have thus come out with a product called "Active seal-tight waterproof cast covers". It works by stretching elasticated material over the plaster cast ensuring that a watertight seal is formed over the cast allowing people to have a normal shower. The only drawback: PRICE ! (The Active seals are priced at approximately $30)
Given that most people have at least one fracture in their lives, we can establish that there is enough demand and hence market for these waterproof covers. Manufacturing them cheap (in places such as India / China), could be an easy way to flood the markets with the product not only ensuring it is a big success, but also helping people live a normal life even with a cast on !!!
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