Socketed portal anchors and methods of using same

Patent metadata

Field	Value
Publication number	US-9302043-B2
Application number	US-201313795937-A
Country	US
Kind code	B2
Filing date	Mar 12, 2013
Priority date	Mar 12, 2013
Publication date	Apr 5, 2016
Grant date	Apr 5, 2016

Abstract

Anchors for securing a medical device relative to a body portal, wherein the anchors may accommodate most any implantation trajectory through the portal. Such anchors may further secure the device along any such trajectory without imparting undesirable biasing forces that may shift the device from its intended implanted location. In some embodiments, the anchor is configured as a burr hole anchor including a spherical member contained in a socket of the anchor wherein the socket may be collapsed to lock the spherical member along a particular trajectory.

First claim

What is claimed is:

1. An anchor configured to secure a medical device implanted via a portal formed in a mammalian body, the anchor comprising:
a base operable to secure to tissue surrounding the portal, the base comprising an upper side, lower side, outer edge, and inner edge, the inner edge defining an opening passing between the upper and lower sides of the base, the opening forming a socket; and
a retention member configured to be received within the socket and recessed into the portal, the retention member defining a bore configured to permit passage with clearance of the medical device through the retention member when the retention member is in an uncompressed state;
the base configured for movement between:
an expanded configuration, corresponding to the retention member being in the uncompressed state, wherein clearance or minimal contact exists between the socket and the retention member such that the retention member is selectively rotatable within the socket; and
a locked configuration wherein the socket contracts and compresses the retention member to a compressed state, wherein the retention member is immobilized relative to the base when in the compressed state, and further wherein,
compression of the retention member causes a compression of the bore to reduce a diameter of the bore along a substantial portion of its length, sufficient to immobilize the medical device relative to the retention member.

2. The anchor of claim 1 , wherein the retention member comprises an elastomeric spherical member configured to rotate, when in the uncompressed state, within the socket about three mutually perpendicular axes.

3. The anchor of claim 1 , wherein the base defines a slot extending radially from the socket through the outer edge to define spaced-apart first and second portions of the base, and wherein the base moves from the expanded configuration to the locked configuration by selectively moving the first and second portions closer to one another.

4. The anchor of claim 3 , further comprising an arm spanning across the slot, the arm having a first end attached to the first portion of the base and a second end attached to a cam mechanism attached to the second portion of the base, wherein the cam mechanism is configured to selectively displace, via the arm, the first portion of the base relative to the second portion.

5. The anchor of claim 3 , further comprising a clip, the clip configured to engage the first and second portions of the base and hold the first portion in fixed relation relative to the second portion.

6. The anchor of claim 5 , wherein the clip is configured to hold the first and second portions at a spacing corresponding to the expanded configuration of the base.

7. The anchor of claim 5 , wherein the clip is configured to hold the first and second portions at a spacing corresponding to the locked configuration of the base.

8. The anchor of claim 3 , wherein the slot is configured to receive the medical device therein when the base is in the locked configuration.

9. The anchor of claim 1 , further comprising a cap configured to secure to the upper side of the base.

10. A burr hole anchor configured to secure a medical device implanted through a burr hole, the anchor comprising:
a base operable to secure to bone surrounding the burr hole, the base comprising an upper side, lower side, outer edge, and inner edge, the inner edge defining an opening passing between the upper and lower sides of the base, the opening forming a socket, wherein the base defines a slot extending radially from the socket through the outer edge to define spaced-apart first and second portions of the base; and
an elastomeric spherical member configured to be recessed into the burr hole and to be received within the socket such that the spherical member, when in an uncompressed state, may rotate therein about three mutually perpendicular axes, the spherical member defining a bore configured to permit passage with clearance of the medical device through the spherical member when the spherical member is in the uncompressed state;

wherein the base is configurable in:
an expanded configuration, corresponding to the spherical member being in the uncompressed state, wherein either clearance or minimal contact exists between the socket and the spherical member such that the spherical member is selectively rotatable within the socket; and
a locked configuration wherein the socket contracts and compresses the spherical member to a compressed state, wherein, when in the compressed state, the spherical member is immobilized relative to the base;
the base being reconfigurable between the expanded configuration and the locked configuration by movement of the first portion of the base toward the second portion of the base.

11. The anchor of claim 10 , further comprising a cap configured to secure to the upper side of the base when the base is in the locked configuration.

12. The anchor of claim 10 , wherein one or both of the first and second portions of the base comprises stop members configured to limit movement of the first portion of the base toward the second portion beyond the locked configuration.

13. The anchor of claim 10 , further comprising an arm having a first end connected to the first portion of the base and a second end connected to a cam mechanism located on the second portion of the base, wherein the cam mechanism is configured to selectively displace the second end of the arm from a first position corresponding to the expanded configuration of the base, to a second position corresponding to the locked configuration of the base.

14. The anchor of claim 13 , wherein the first end of the arm is pivotally connected to the first portion of the base.

15. The anchor of claim 10 , further comprising a clip selectively attachable to the base and configured to hold the base in the expanded configuration, the locked configuration, or another configuration between the expanded and locked configurations.

16. The anchor of claim 15 , wherein the clip attaches to protrusions formed on both the first and second portions of the base.

17. The anchor of claim 10 , wherein the slot is configured to receive the medical device when the base is in the locked configuration.

18. An infusion system comprising:
a therapy catheter implantable through a burr hole, the therapy catheter comprising a therapy delivery end configured to be positioned at a target tissue location;
a delivery catheter operable to deliver a therapeutic agent, from a source containing the therapeutic agent, to the therapy catheter;
a connector configured to fluidly couple the therapy catheter with the delivery catheter;
and an anchor comprising:
a base operable to secure to tissue surrounding the burr hole, the base comprising an upper side, lower side, outer edge, and inner edge, the inner edge defining an opening passing between the upper and lower sides of the base, the opening forming a socket; and
a retention member configured to be received within the socket and to be recessed into the burr hole, the retention member defining a bore configured to permit passage with clearance of the therapy catheter through the retention member when the retention member is in an uncompressed state;
the base configured for movement between:
an expanded configuration, corresponding to the retention member being in the uncompressed state, wherein clearance or minimal contact exists between the socket and the retention member such that the retention member is selectively rotatable within the socket; and
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Assignees

• Medtronic Inc

Inventors

• Nelson Brian D

Classifications

• A61M25/02 Primary

  Holding devices, e.g. on the body · CPC title

• A61M2039/0273

  for introducing catheters into the body · CPC title

• A61M5/14276

  specially adapted for implantation · CPC title

• A61M39/0247

  Semi-permanent or permanent transcutaneous or percutaneous access sites to the inside of the body (peritoneal dialysis catheters A61M1/285; tracheostomy devices A61M16/0465; measuring pressure within the body A61B5/03; colostomy devices A61F5/445; gastrotomy feeding tubes A61J15/0015; means for fixing a feeding tube outside of the body A61J15/0053) · CPC title

• A61M2025/0273

  having slits to place the pad around a catheter puncturing site · CPC title