Methods and apparatus for securing a therapy delivery device within a burr hole

• US 20050182421A1
• Filed: 02/09/2005
• Published: 08/18/2005
• Est. Priority Date: 02/13/2004
• Status: Abandoned Application

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Schulte, Gregory T., Sage, Shahn S., Otten, Lynn M., Adams, Matthew H.
• Application Number:
  US11/054,073
• Publication Number:
  US 20050182421A1
• Time in Patent Office: Days
• US Class Current: 606/130
• CPC Class Codes: A61B 2017/3407 including a base for support on the body
• CPC Class Codes: A61B 2017/347 Locking means, e.g. for locking instrument in cannula
• CPC Class Codes: A61B 2017/3492 against the outside of the body
• CPC Class Codes: A61B 2090/103 Cranial plugs for access to brain
• CPC Class Codes: A61B 90/11 with guides for needles or instruments, e.g. arcuate slides or ball joints
• CPC Class Codes: A61N 1/0539 Anchoring of brain electrode systems, e.g. within burr hole

Abstract

Apparatus and methods for securing a therapy delivery device relative to a burr hole. In one embodiment, the apparatus includes a base that is securable to bone, without the use of fasteners, either before or after insertion of the therapy delivery device through the burr hole. The apparatus may further include a stabilizer that may be engaged with both the base and the therapy delivery device while the delivery device is held with positioning apparatus. The base and/or stabilizer may frictionally engage the delivery device, e.g., receive it with interference, to secure the device in two or more non-parallel directions. In some embodiments, at least the stabilizer may include a surface coating or treatment operable to enhance frictional engagement with the therapy delivery device.

Claims

1. An apparatus for anchoring a therapy delivery device relative to a burr hole, the apparatus comprising:

a base operable to seat in or near the burr hole, the base comprising a peripheral portion at least partially surrounding a central opening; and

a stabilizer securable within the central opening, the stabilizer comprising an outer edge and a plurality of inner sidewalls, wherein two inner sidewalls of the plurality of inner sidewalls form a slot extending through the outer edge when the stabilizer is secured within the central opening, the slot operable to frictionally receive the delivery device at most any location along a length of the slot.

2. The apparatus of claim 1, wherein the outer edge of the stabilizer is operable to fit within a circumferential groove formed in the base.

3. The apparatus of claim 1, wherein the peripheral portion of the base forms a flange portion operable to seat against a cranial surface.

4. The apparatus of claim 3, further comprising fasteners to secure the flange portion to the cranial surface.

5. The apparatus of claim 1, wherein the base further comprises an engagement portion for seating against an inner surface of the burr hole.

6. The apparatus of claim 5, wherein the engagement portion comprises protrusions.

7. The apparatus of claim 3, wherein a channel is formed in an upper surface of the flange portion, the channel extending outwardly from the central opening to a point at or near an outermost edge of the flange portion.

8. The apparatus of claim 7, wherein a width of the channel is equal to or less than an undeflected outer dimension of the therapy delivery device.

9. The apparatus of claim 7, wherein the channel is operable to receive the therapy delivery device with an interference fit.

10. The apparatus of claim 7, wherein the channel is non-linear.

11. The apparatus of claim 10, wherein the channel comprises two or more intersecting linear segments.

12. The apparatus of claim 10, wherein the channel comprises a curved segment.

13. The apparatus of claim 7, wherein the channel forms a slot extending downwardly through a lower surface of the flange portion.

14. The apparatus of claim 1, wherein the apparatus further comprises a cap member.

15. The apparatus of claim 14, wherein the cap member comprises protrusions operable to engage corresponding openings in the base.

16. The apparatus of claim 1, wherein the stabilizer comprises tool interface surfaces.

17. The apparatus of claim 16, wherein the base comprises tool interface surfaces.

18. The apparatus of claim 16, wherein the tool interface surfaces comprise surfaces defined by openings formed in the stabilizer.

19. The apparatus of claim 1, wherein one or both of the base and the stabilizer comprises a coating.

20. The apparatus of claim 19, wherein the coating comprises a material selected from the group consisting of silicone, polyurethane, polyethylene, and polyacrylate.

21. The apparatus of claim 19, wherein the coating comprises vitreous or paralytic carbon.

22. The apparatus of claim 1, wherein the therapy delivery device is a catheter.

23. The apparatus of claim 1, wherein a maximum height of the peripheral portion is about 4 millimeters or less.

24. The apparatus of claim 23, wherein the maximum height of the peripheral portion is about 3 millimeters or less.

25. The apparatus of claim 1, wherein the base comprises a material selected from the group consisting of nylon, polyurethane, polycarbonate, polyamide, and polyetheretherketone.

26. The apparatus of claim 1, wherein the stabilizer comprises a material selected from the group consisting of nylon, polyurethane, polycarbonate, polyamide, and polyetheretherketone.

27. The apparatus of claim 1, wherein at least one of the two inner sidewalls comprise a cantilevered arm.

28. The apparatus of claim 1, wherein the stabilizer comprises a disk-shaped member having a radial slot formed therein.

29. A method for securing a therapy delivery device relative to a burr hole, the method comprising:

inserting the therapy delivery device through the burr hole;

positioning a base of a burr hole retention apparatus in or near the burr hole such that the therapy delivery device is located within a central opening of the base;

positioning a stabilizer proximate the base, the stabilizer comprising an outer edge and a plurality of inner sidewalls, wherein two adjacent inner sidewalls of the plurality of inner sidewalls define a slot extending through the outer edge when the stabilizer is secured within the central opening;

placing the therapy delivery device into the slot;

coupling the stabilizer to the base; and

clamping the therapy delivery device between the two adjacent inner sidewalls at most any location along a length of the slot.

30. The method of claim 29, wherein coupling the stabilizer to the base comprises securing the stabilizer within the central opening of the base.

31. The method of claim 29, wherein clamping the therapy delivery device between the two adjacent inner sidewalls comprises clamping the therapy delivery device between the two adjacent inner sidewalls while the therapy delivery device is connected to positioning equipment.

32. The method of claim 31, wherein the positioning equipment comprises a stylet supported by stereotactic apparatus.

33. The method of claim 29, further comprising routing the therapy delivery device through a channel formed in an upper surface of a flange portion of the base.

34. An implantable therapy delivery system, comprising:

a therapy delivery device for implantation through a burr hole;

a therapy source operatively coupled to the therapy delivery device;

an apparatus for anchoring a therapy delivery device relative to the burr hole, wherein the apparatus comprises;

a base operable to seat in or near the burr hole, the base comprising a peripheral portion at least partially surrounding a central opening through which the delivery device may pass; and

a stabilizer securable within the central opening, the stabilizer comprising an outer edge and a plurality of inner sidewalls, wherein two inner sidewalls of the plurality of inner sidewalls form a slot extending through the outer edge when the stabilizer is secured within the central opening, the slot operable to frictionally receive the delivery device at most any location along a length of the slot.

35. The system of claim 34, wherein the therapy source comprises an implantable infusion pump.