Helmet and brain injury - Lecture 19

Question 1

Hockey helmet certification standard

Answer 1

-Construction and coverage
-shock absorption
-penetration
retention system properties (how well the helmet stays on the head)
-field of vision (measures how well you can see)
-marking and information (to prevent being sued)

Question 2

Biomechanics of brain injury

Question 3

Where you get hit matters

Answer 3

-side of the head is more vulnerable

Question 4

Laurence of Arabia
aka T.E Lawrence

Answer 4

His motorcycle was a gift from his friend
George Bernard Shaw

Question 5

Requirements and the corresponding test methods, where appropriate, are given for the following:

Answer 5

• Construction and coverage
• shock absorption
• penetration
• retention system properties
• field of vision
• marking and information.

Question 6

Shock absorbing capacity

Answer 6

When tested in accordance with Clause 5.4, no single impact shall exceed a peak acceleration of 275g or 1500 GSI under all test conditions. The outer covering (shell) shall remain intact, with no cracks visible through its thickness.

Question 7

Biomechanics of Brain Injury

Answer 7

1. Accident events (sport) resulting in concussions: Falls, collisions, punches and projectiles.
2. Impact Event Characteristics: Location, Velocity, Duration, Mass, Impact Direction.
3. Dynamic Response Characteristics: linear acceleration, rotational acceleration, duration, direction of impact.
4. Brain tissue trauma: strain, stress, pressure, strain rate.