No, it is so that the puck slides better on the ice. Since the puck becomes harder it would probably do more injury, not less.
describe how a reflex can prevent injury
No.
A guard is a device designed to prevent injury from rotating machinery.
It can prevent an accident or injury
It depends on what kind of injury. Bell Boots would prevent injury to the hooves. So would shoes. And leg wraps would prevent injury to the tendons in the lower leg. But like I said, it depends on what kind of injury you are triyng to prevent.
To prevent injury.
Absolutely not.
It can prevent an accident or injury
Crumple Zones prevent damage or injury by supplying a place in the structure of the frame to crumple in an accident.
Violently hit, or slam a player into the boards. If an injury occurs, it is a major penalty. If there is no injury, it is a minor penalty.
It is the cooling of the injury which does it good. It doesn't matter what you use to achieve that.
Cheap hockey sticks are at risk of shattering or otherwise warping and bending along the frame. This can cause injury, or render the hockey stick unusable.