Methods and devices to reduce the likelihood of injury from concussive or blast forces
A method and device for reducing the damaging effects of radiant energy, blast, or concussive events includes applying pressure to at least one jugular vein to reduce the egress of blood from the cranial cavity during or before the incidence of the imparting event. Reducing blood outflow from the cranial cavity increases intracranial volume and/or pressure of the cerebrospinal fluid to reduce the risk of traumatic brain injury and injuries to the spinal column. Reducing blood outflow further increases the intracranial pressure and volume, and thereby increases the pressure and volume of the cochlear fluid, the vitreous humor and the cerebrospinal fluid to thereby reduce the risk of injury to the inner ear, internal structure of the eye and of the spinal column. In addition, increasing intracranial pressure and volume reduces the likelihood of brain injury and any associated loss of olfactory function.
1. A method for preventing or reducing the severity of a concussion in a subject exposed to a concussive force comprising applying an externally-applied pressure of about 15 mm Hg to about 80 mm Hg to one or more outflow vessels of the subject's cranium.
2. The method of claim 1 , wherein the pressure is applied to two or more outflow vessels of the subject's cranium.
3. The method of claim 2 , wherein the two or more outflow vessels comprises an internal jugular vein.
4. The method of claim 2 , wherein the two or more outflow vessels comprises an external jugular vein.
5. The method of claim 1 , wherein the one or more outflow vessels comprises an internal jugular vein.
6. The method of claim 1 , wherein the one or more outflow vessels comprises an external jugular vein.
7. The method of claim 1 , wherein the concussive force is an impact.
8. The method of claim 1 , wherein the concussive force is a blast wave.
9. The method of claim 1 , wherein the pressure is applied to the one or more outflow vessels of the subject's cranium prior to and during exposure to the concussive force.
10. The method of claim 1 , wherein the pressure is applied by a device worn about the neck of the subject, the device comprising a collar having one or more inwardly-directed structures positioned to partially or totally occlude the one or more outflow vessels of the subject's cranium.
11. The method of claim 10 , wherein the one or more outflow vessels comprises an internal jugular vein.
12. The method of claim 10 , wherein the one or more outflow vessels comprises an external jugular vein.
13. The method of claim 10 , wherein the device comprises two or more inwardly-directed structures positioned to partially or totally occlude two or more outflow vessels of the subject's cranium.
14. The method of claim 10 , wherein the collar is sized to fully encircle the neck of the subject.
15. The method of claim 14 , wherein the collar further comprises a breakaway release mechanism.
16. The method of claim 10 , wherein the collar is sized to partially encircle the neck of the subject.
17. The method of claim 10 , wherein the one or more inwardly-directed structures are non-inflatable.
18. The method of claim 10 , wherein the one or more inwardly-directed structures are inflatable.
19. The method of claim 18 , wherein the collar further comprises a pressure release valve.