An 
assembly for securing an 
electrode lead within a burr hole formed in a patient's 
skull. The 
assembly is provided for reliably, easily, and reversibly securing an implanted 
electrode lead such that the active portion of the lead which is inside the 
brain tissue within the 
skull is not subject to unwanted translations when the external portion of the lead is manipulated. The securing 
assembly has two separate components. The first is a bone port which seats within a preformed burr hole in the 
skull. The bone port is a cylindrical shaped short tube which includes a means for gripping the skull on the external periphery of the cylinder. The central axial hole of the port is designed to receive the second lead-locking portion of the assembly. The external surface of the lead-locking portion and the interior surface of the central axial hole of the port include an easily engageable 
coupling means, for example a bayonet 
locking mechanism. The lead-locking portion has a central 
electrode passage through which the electrode lead may slide freely in an unlocked disposition. The upper section of the lead-locking portion includes a sliding member which may be selectively manipulated between a closed and open position. The sliding member has a lateral edge which, when the member is moved into the closed position, partially occludes the electrode passage such that an electrode is secured by friction in the passage, thus preventing movement of the active implanted portion of the electrode within the skull. The external portion of the electrode, however, can be manipulated freely.