Burr hole cap assembly with therapy delivery member orientation feature

Patent metadata

Field	Value
Publication number	US-9855405-B2
Application number	US-201213451133-A
Country	US
Kind code	B2
Filing date	Apr 19, 2012
Priority date	Apr 29, 2011
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

Abstract

In some examples, a burr hole cap assembly includes one or more markers that indicate a rotational orientation of a therapy delivery member relative to the burr hole cap assembly, where the therapy delivery member extends through an opening defined by the burr hole cap assembly. In addition, in some examples, the burr hole cap assembly includes a feature that indicates the rotational orientation of the therapy delivery member after the therapy delivery member is implanted in the patient. The feature can include the one or more markers in some examples.

First claim

What is claimed is:

1. A system comprising:
a therapy delivery member configured to deliver therapy from a medical device to a patient;
a base that is configured to be positioned at least partially inside of a burr hole in a cranium of a patient, wherein the base defines an opening, and wherein the therapy delivery member is configured to be introduced through the opening into the burr hole in the cranium of the patient when the base is positioned at least partially inside of the burr hole;
a marker that is configured to indicate a rotational orientation of the therapy delivery member about a longitudinal axis of the therapy delivery member within the opening relative to the base; and
a cover that is configured to substantially cover the opening defined by the base when the therapy delivery member extends through the opening, wherein the base, the marker, and the cover are configured to be implanted under a skin of the patient while the base is positioned at least partially inside of the burr hole in the cranium of the patient, the therapy delivery member extends through the opening into the burr hole in the cranium of the patient, and the cover substantially covers the opening defined by the base.

2. The system of claim 1 , wherein the cover is configured to substantially fix a position of the therapy delivery member relative to the base when the therapy delivery member extends through the opening defined by the base.

3. The system of claim 1 , wherein the marker comprises a visible marker positioned on the base.

4. The system of claim 1 , wherein the marker comprises a radiopaque marker.

5. The system of claim 1 , wherein the system comprises a plurality of individual markers, the plurality of individual markers including the marker, and wherein the plurality of individual markers indicate respective positions around the base.

6. The system of claim 1 , further comprising a rotatable member that is configured to rotate relative to the base, wherein the rotatable member comprises the marker.

7. The system of claim 1 , wherein the marker comprises an indicator element that is configured to be located in the cranium of the patient or around the base at a position that indicates the rotational orientation of the therapy delivery member about the longitudinal axis of the therapy delivery member within the opening relative to the base, and wherein the indicator element is movable relative to the base and the cover.

8. The system of claim 7 , wherein the indicator element is radiopaque.

9. The system of claim 1 , further comprising an inductor, wherein at least one of an inductive reactance or an inductance of the inductor is indicative of a rotational orientation of the marker relative to the base.

10. The system of claim 9 , further comprising a reader device that is configured to determine a parameter indicative of the inductive reactance of the inductor.

11. The system of claim 9 , further comprising a rotatable member that comprises the marker and the inductor, the rotatable member being rotatable relative to the base, wherein the at least one of the inductive reactance or the inductance of the inductor changes based on a rotational position of the rotatable member relative to the base.

12. The system of claim 11 , wherein the inductor comprises a conductive coil and a core movable relative to the conductive coil, and wherein the rotatable member is mechanically connected to the core and configured such that rotation of the rotatable member relative to the base moves the core relative to the conductive coil.

13. The system of claim 11 , wherein the inductor comprises a conductive coil mechanically connected to the rotatable member, and wherein rotation of the rotatable member relative to the base changes a coiled length of the conductive coil.

14. The system of claim 1 , further comprising:
a capacitive element; and
a rotatable member that comprises the marker and the capacitive element, the rotatable member being rotatable relative to the base, wherein a capacitance of the capacitive element changes based on a rotational position of the rotatable member relative to the base.

15. The system of claim 1 , wherein the marker comprises a ferromagnetic material, the system further comprising:
an inductor within the base; and
a rotatable member that comprises the marker, the rotatable member being rotatable relative to the base, wherein the inductance of the inductor changes based on a rotational position of the marker relative to the base.

16. The system of claim 1 , wherein the marker comprises a first marker, wherein the therapy delivery member includes a second marker, the first marker being configured to be moved relative to the base to substantially align with the second marker.

17. The system of claim 1 , further comprising an inductor within the base, wherein the therapy delivery member comprises the marker, the marker comprising a ferromagnetic marker, and wherein a proximity of the ferromagnetic marker to the inductor indicates the rotational orientation of the therapy delivery member relative to the base.

18. A method comprising
introducing a therapy delivery member through an opening defined by a base of a burr hole cap assembly into a burr hole in a cranium of a patient, wherein the therapy delivery member is configured to deliver therapy from a medical device to the patient, wherein the base is configured to be positioned at least partially inside of the burr hole in the cranium of the patient, wherein the burr hole cap assembly includes a marker that is configured to indicate a rotational orientation of the therapy delivery member about a longitudinal axis of the therapy delivery member within the opening relative to the base and a cover that is configured to substantially cover the opening defined by the base when the therapy delivery member extends through the opening;
indicating the rotational orientation of the therapy delivery member about the longitudinal axis of the therapy delivery member relative to the base with the marker of the burr hole cap assembly; and
implanting the base, the marker, and the cover such that base, the marker, and the cover are under a skin of the patient while the base is positioned at least partially inside of the burr hole in the cranium of the patient, the therapy delivery member extends through the opening into the burr hole in the cranium of the patient, and the cover substantially covers the opening defined by the base.

19. The method of claim 18 , wherein the marker comprises a first marker, and indicating the rotational orientation of the therapy delivery member about the longitudinal axis of the therapy delivery member relative to the base comprises:
locating a second marker on the therapy delivery member; and
locating, from among a plurality of markers that are at different positions around a perimeter of the base, the first marker that substantially aligns with a second marker.

20. The method of claim 18 , wherein the marker comprises a first marker and the therapy delivery member comprises a second marker, and wherein indicating the rotational orientation of the therapy delivery member about the longitudinal axis of the therapy delivery member relative to the base comprises rotating a rotatable member that comprises the first marker to substantially align the first marker with the second marker, wherein the rotatable member is rotatable relative to the base.

21. The method of claim 20 , wherein the rotatable member comprises an inductor, whe

Assignees

• Goetz Steven M
• Holle Mark J
• Singal Ashish
• Bondhus Spencer M
• Medtronic Inc

Inventors

• Goetz Steven M
• Holle Mark J
• Singal Ashish
• Bondhus Spencer M

Classifications

• A61N1/37252

  Details of algorithms or data aspects of communication system, e.g. handshaking, transmitting specific data or segmenting data · CPC title

• A61N1/37223

  Circuits for electromagnetic coupling · CPC title

• A61N1/0539

  Anchoring of brain electrode systems, e.g. within burr hole · CPC title

• A61M2210/0687

  Skull, cranium · CPC title

• A61M2025/028

  having a mainly rigid support structure · CPC title