Recessed burr hole covers and methods for using the same
A burr hole cover is configured to be recessed in a burr hole formed in a patient and includes a base and a cap provided with complementary features to allow a portion of a medical device, such as a brain lead, to be situated in the burr hole cover and then secured by rotation of the cap relative to the base. The features include channels on the base and matching cut-outs on the cap, and slots and locking pockets on the base that are configured to be aligned with locking tabs and locking protrusions on the cap. Because the burr hole cover is recessed in the burr hole, the medical device can extend proximally of the burr hole at the level of the cranium. A bottom surface of the cap may be provided with guides for the lead extending distally in towards the brain.
1. A burr hole cover for securing a portion of a medical device within a burr hole formed in a patient's cranium, the burr hole cover comprising:
a base provided with a cap-receiving aperture, a plurality of base channels, and at least one slot having a locking pocket provided in the at least one slot of the base; and
a cap provided with a corresponding cut-out for each channel of the plurality of base channels provided in the base, and a locking protrusion dimensioned to fit within the at least one slot of the base,
wherein the cap is configured to be placed in the cap-receiving aperture and to transition, through rotational movement of the cap relative to the base, between 1) an unlocked position during which the locking protrusion is vertically aligned with an axis of the at least one slot and the locking protrusion is disengaged from the locking pocket of the at least one slot of the base, and 2) a locked position during which the locking protrusion is offset from the axis of the at least one slot and the locking protrusion is engaged with the locking pocket of the at least one slot of the base.
2. The burr hole cover of claim 1 wherein the cap further comprises at least one recession configured to receive a surgical tool to assist in manipulating the cap relative to the base.
3. The burr hole cover of claim 1 wherein the base is characterized by a base circumference and further comprises at least one pad vertically offset from and extending away from the base circumference.
4. The burr hole cover of claim 3 wherein the at least one pad has a bottom surface aligned with a top surface of the base such that when the base is positioned in the burr hole, the top surface of the base is situated in a plane that is at or below a surface of the cranium at the burr hole.
5. The burr hole cover of claim 1 wherein the cap is provided with a plurality of guides in a bottom surface of the cap, each guide corresponding to one of the channels in the plurality of base channels.
6. The burr hole cover of claim 5 wherein each of the plurality of guides is further configured to contact a length of the medical device during or after the burr hole cover is installed in the patient.
7. The burr hole cover of claim 1 , wherein each channel and the corresponding cut-out are horizontally aligned with each other when the cap is in the unlocked position.
8. The burr hole cover of claim 7 , wherein each channel and the corresponding cut-out form an aperture when the channel and the corresponding cut-out are horizontally aligned, the aperture configured to receive the medical device.
9. The burr hole cover of claim 1 , wherein each channel and the corresponding cut-out are horizontally offset from each other when the cap is in the locked position.
10. The burr hole cover of claim 9 , wherein a radius of the corresponding cut-out is configured to engage the medical device when the channel and the corresponding cut-out are horizontally offset.