Medical device anchoring apparatus and methods

Patent metadata

Field	Value
Publication number	US-9539421-B2
Application number	US-201313795441-A
Country	US
Kind code	B2
Filing date	Mar 12, 2013
Priority date	Dec 5, 2012
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

Methods and apparatus for anchoring an elongate medical device within a body portal, for example, a stimulation lead in a cranial burr hole, employ a securing element attached to a plate member, which may be held over a body portal by a base ring. The securing element includes a spring member and an engagement surface; a retaining member holds the engagement surface, spaced apart from a side of a slot of the plate member, in an open position, against a bias of the spring member. In the open position, the device may be received between the engagement surface and the side of the slot, through an opening of the slot. Disengaging the retaining member releases a moveable portion of the spring member to move the engagement surface toward the side of the slot and into a closed position, at which the inserted device is anchored. The anchored device may be routed through one of a plurality of base ring channels.

First claim

The invention claimed is:

1. An anchoring assembly for an elongate medical device, the assembly comprising:
a plate member generally defining a plane and including a slot that extends generally along the plane, the slot including a first side, a second side, opposite the first side, and an opening located at a perimeter of the plate member, from which the first and second sides extend;
a securing element attached to the plate member and overlaying a surface of the plate member, the surface being substantially parallel to the defined plane of the plate member, the securing element including an engagement surface and a spring member, the spring member including a first portion fixed to the plate member, and a second, moveable portion coupled to the engagement surface to move the engagement surface, relative to the plate member, between an open position and a closed position, the engagement surface being spaced apart from the first side of the slot by a first distance in the open position, and being spaced apart from the first side of the slot by a second distance in the closed position, the first distance allowing insertion of the elongate medical device through the opening of the slot and between the engagement surface and the first side of the slot, and the second distance being less than the first distance at which the engagement surface anchors the inserted device; and
a retaining member comprising a first pin member configured to engage and disengage with the securing element, and a second pin member configured to engage and disengage with the plate member;
wherein the retaining member, when engaged with the securing element, holds the moveable portion of the spring member against a bias of the spring member, to keep the engagement surface of the securing element in the open position; and
when the retaining member is disengaged from the securing element, the moveable portion of the spring member is released to move the engagement surface to the closed position.

2. The assembly of claim 1 , wherein the engagement surface of the securing element, in the open position, extends at an angle with respect to the first side of the slot of the plate member; and when the moveable portion of the spring member is released, the engagement surface pivots through the angle toward the first side of the slot.

3. The assembly of claim 2 , wherein the first side of the slot of the plate member includes a shoulder formed therein at the perimeter of the plate member; and the securing element further includes an end portion located in proximity to the opening of the slot, the end portion being configured to engage beneath the shoulder of the first side of the slot, when the engagement surface of the securing element is in the closed position.

4. The assembly of claim 1 , wherein:
the plate member further includes a hole extending therethrough;
the securing element includes a hole formed therethrough, the hole of the securing element aligned with the hole of the plate member when the engagement surface is in the open position; and
wherein the first pin member is sized to simultaneously fit within the holes of the plate member and the securing element to hold the engagement surface of the securing element in the open position, and the first pin member is removable from the holes to allow the engagement surface of the securing element to move to the closed position.

5. The assembly of claim 4 , wherein:
the hole of the plate member is a first hole of a pair of holes extending through the plate member, a second hole of the pair of holes being spaced apart from the first hole by a distance; and
wherein the second pin member is spaced apart from the first pin member by approximately the same distance by which the first and second holes of the plate member are spaced apart, the second pin member being sized to fit within the second hole, when the first pin member fits within the first hole to hold the engagement surface of the securing element in the open position, and the second pin member being removable from the second hole along with the first pin member being removable from the first hole to allow the engagement surface of the securing element to move to the closed position.

6. The assembly of claim 1 , further comprising a base ring to fit around a body portal, the base ring including a rim and a mounting surface, the mounting surface having an inner perimeter that defines a hole to be aligned with the body portal, the mounting surface extending within an inner perimeter surface of the rim and being recessed from an upper surface of the rim; wherein the plate member fits within the inner perimeter surface of the rim with a lower surface of the plate member abutting the mounting surface of the base ring, the lower surface being opposite the surface of the plate member which is overlaid by the securing element.

7. The assembly of claim 6 , wherein:
the rim of the base ring includes snap-fit features protruding inward from the inner perimeter surface thereof; and
when the lower surface of the plate member abuts the mounting surface of the base ring, the snap-fit features of the rim engage the plate member in a snap fit.

8. The assembly of claim 7 , wherein
the upper surface of the rim includes a plurality of grooves formed therein, each groove extending from the inner perimeter surface of the rim outward; and
when the plate member is engaged in the snap fit, one of the grooves is located to receive a proximal portion of the inserted device.

9. The assembly of claim 6 , wherein the base ring is separate from a remainder of the assembly, and further comprising a base ring centering tool for fitting the base ring around the body portal before fitting the plate member within the inner perimeter surface of the rim of the base ring; the base ring centering tool comprising:
a barrel including an upper portion and a lower portion, a perimeter of the lower portion being sized to fit through the hole of the base ring and within the body portal; and
a plurality of clip arms extending outward from the upper portion of the barrel and spaced apart from one another about the perimeter of the upper portion, each clip arm being configured to grasp around a wall portion of the rim of the base ring when the lower portion of the barrel extends through the hole of the base ring and protrudes from a lower surface thereof, the lower surface being opposite the mounting surface.

10. The assembly of claim 9 , wherein:
the rim of the base ring includes snap-fit features protruding inward from the inner perimeter surface thereof;
the base ring centering tool further comprises a collar extending about a perimeter thereof, between the upper portion and the lower portion, the collar having a lower surface and slots extending through a thickness thereof, each slot being located for alignment with a corresponding snap-fit feature as the lower portion of the barrel of the centering tool is inserted through the hole of the base ring so that the lower surface of the collar abuts the mounting surface of the base ring, and the thickness of the collar allows the collar to slide between the snap-fit features of the base ring and the mounting surface of the base ring when the lower surface of the collar abuts the mounting surface.

11. The assembly of claim 10 , wherein:
at least one of the snap-fit features is located on one of the wall portions of the rim that is engaged by one of the clip arms of the base centering tool;
the upper portion of the base ring centering tool further includes a protruding tab member located beneath each clip arm, each protruding tab member including a peak surface and a ramp surface receding from the peak surface, th

Assignees

• Medtronic Inc

Inventors

• Bonde Eric H
• Holle Mark J

Classifications

• A61M25/04

  in the body, e.g. expansible {(A61M25/10, A61M16/0488 take precedence)} · CPC title

• A61M2025/024

  having a clip or clamp system · CPC title

• A61B90/11

  with guides for needles or instruments, e.g. arcuate slides or ball joints · CPC title

• A61B17/3468

  for implanting or removing devices, e.g. prostheses, implants, seeds, wires (devices for implanting seeds A61M37/0069) · CPC title

• A61B2090/103

  Cranial plugs for access to brain · CPC title