Epidural/subdural minimally invasive access tool

A cranial drill guide for guiding a drill comprising:

• a housing;
• a drill guide sleeve assembly pivotally attached to the housing, the drill guide sleeve assembly having at least two degrees of freedom to allow the drill guide sleeve assembly to be moved to a first pivoted position for forming an angled burr hole through a cranial surface;
• and
• a depth adjustment mechanism that is part of the drill guide sleeve assembly and is configured to set a maximum insertion position for the drill within the drill guide sleeve assembly and thereby permit a depth of the angled burr hole to be controlled;
• wherein the drill guide sleeve assembly comprises an outer sleeve, an inner sleeve, and a drill sleeve, the outer sleeve being pivotally coupled to the housing about a first pivot axis, while the inner sleeve and drill sleeve move axially within the outer sleeve in response to the pivoting of the outer sleeve.

A method for forming an angled burr hole through a cranial surface comprising the steps of:

• positioning a cranial drill guide on the cranial surface, the drill guide having a pivotable drill guide sleeve assembly that is configured to receive a cranial drill;
• inserting the cranial drill within the drill guide sleeve assembly;
• and
• moving the drill guide sleeve assembly from a first position to a first pivoted position, while the cranial drill is inserted within the drill guide sleeve assembly, resulting in a drill bit of the drill being automatically advanced into the cranial surface to form the angled burr hole through the cranial surface.