Headrest for surgical chairs

1. A headrest device comprising:

a center plate configured to attach to an extension arm, wherein the center plate has a concave surface and a convex surface;

an inner compression plate positioned on a first side of the center plate, wherein the inner compression plate has a convex surface configured to engage the concave surface of the center plate;

a padded headrest attached to the inner compression plate;

an outer compression plate positioned on a second side of the center plate opposite the first side of the center plate, wherein the outer compression plate has a concave surface configured to engage the convex surface of the center plate; and

a lever that is movable between a locked state and an unlocked state, wherein the lever applies a clamping force between the inner compression plate and the outer compression plate when in the locked state, wherein the inner compression plate is free to shift in any direction along the concave surface of the center plate while the lever is in the unlocked state, and wherein the inner compression plate is prevented from shifting along the concave surface of the center plate when the lever is in the locked state.

2. The device of claim 1 , wherein shifting the inner compression plate along the concave surface of the center plate changes an angle between a principle axis of the center plate and a principle axis of the inner compression plate.

3. The device of claim 1 , further comprising a clamping bolt passing through the outer compression plate and the inner compression plate, wherein the clamping force is applied to the outer compression plate and the inner compression plate through the clamping bolt.

4. The device of claim 1 , further comprising one or more mounting members attached to the center plate, wherein the mounting members facilitate attaching the center plate to the extension arm.

5. The device of claim 4 , further comprising one or more fore-arm supports attached to the one or more mounting members, wherein the fore-arm supports facilitate holding a patient's head.

6. The device of claim 1 , wherein a spherical cap radius of the inner compression plate is greater than a spherical cap radius of the center plate.

7. The device of claim 1 , wherein the inner compression plate includes an indentation formed therein to accommodate a patient's neck.

8. The device of claim 1 , wherein the opening in the center plate is elongated to enable the padded headrest to tilt at a greater angle in at least one direction than in other directions.

9. A headrest device comprising:

a first plate configured to attach to an extension arm, the first plate having a concave surface and a convex surface;

a second plate having a convex surface configured to engage the concave surface of the first plate; and

a locking mechanism, wherein the second plate is free to shift in any direction along the concave surface of the first plate while the locking mechanism is in an unlocked state, and wherein the second plate is prevented from shifting along the concave surface of the first plate when the locking mechanism is in a locked state, and

a padded headrest attached to the second plate.

10. The device of claim 9 , wherein shifting the second plate along the concave surface of the first plate changes an angle between a principle axis of the first plate and a principle axis of the second plate.

11. The device of claim 9 , further comprising a third plate, wherein the second plate and the third plate are compression plates positioned on opposing sides of the first plate, and wherein the locking mechanism includes a lever configured to apply a clamping force between the second plate and the third plate while the locking mechanism is in the locked state.

12. The device of claim 11 , further comprising a clamping bolt passing through the second plate and the third plate, wherein the clamping force is applied to the second plate and the third plate through the clamping bolt.

13. The device of claim 9 , further comprising one or more mounting members attached to the first plate, wherein the mounting members facilitate attaching the first plate to the extension arm.

14. The device of claim 13 , further comprising one or more fore-arm supports attached to the one or more mounting members, wherein the fore-arm supports facilitate holding a patient's head.

15. The device of claim 9 , wherein a spherical cap radius of the second plate is greater than a spherical cap radius of the first plate, and wherein the second plate includes an indentation formed therein to accommodate a patient's neck.

16. The device of claim 9 , wherein the opening in the first plate is elongated to enable the padded headrest to tilt at a greater angle in at least one direction than in other directions.