Dynamic stabilization connecting member with pre-tensioned solid core

Patent metadata

Field	Value
Publication number	US-2016310171-A1
Application number	US-201615197247-A
Country	US
Kind code	A1
Filing date	Jun 29, 2016
Priority date	Jan 18, 2007
Publication date	Oct 27, 2016
Grant date	—

Abstract

A dynamic longitudinal connecting member assembly includes an anchor member having an integral or otherwise fixed elongate core of circular or non-circular cross-section. The core is pre-tensioned and extends through at least one elastic spacer and at least one outer sleeve. The anchor member and the outer sleeve each attach to at least one bone anchor. In operation, the core is held in tension by the spacer.

First claim

1 . In a medical implant assembly having at least first and second bone anchor attachment structures cooperating with a longitudinal connecting member, the improvement wherein the longitudinal connecting member comprises:
a) an anchor member portion in engagement with the first of the bone anchor attachment structures having a longitudinal axis, the anchor member portion having an extension of reduced diameter extending from an end thereof, the extension is initially tensioned along the longitudinal axis and thereafter can be further tensioned when the assembly is fully assembled by releasing a stiff end structure; b) a compressible outer spacer, the extension being received in the spacer, the spacer being positioned between the first and second bone anchor attachment structures and held in compression by the extension; and c) a sleeve, the extension being received within the sleeve and in slidable relationship therewith, the sleeve being in engagement with a second of the bone anchor attachment structures.

2 . The improvement of claim 1 further comprising an elastic bumper, the extension being received within the bumper and the bumper engaging the sleeve.

3 . The improvement of claim 1 wherein the extension is fixed to the anchor member portion at an end thereof.

4 . In a medical implant assembly having at least first and second bone attachment structures cooperating with a longitudinal connecting member, the improvement wherein the longitudinal connecting member comprises:
a) a rigid anchor member portion with a first diameter in engagement with the first of the bone anchor attachment structures, the anchor member portion having a longitudinal axis; b) an attached flexible core extension member with a second reduced diameter along a length thereof, the core extension member connected to and extending from the anchor member portion and being in tension and thereafter can be further tensioned when the assembly is fully assembled by releasing a stiff end structure; c) a compressible outer spacer, the core extension member being received in the spacer, the spacer being positioned between the first and second bone attachment structures; and d) a sleeve, the core extension member being received within the sleeve and in slidable relationship therewith, the sleeve being secured to the second of the bone attachment structures.

5 . In a medical implant assembly having at least first and second bone anchor attachment structures cooperating with a longitudinal connecting member, the improvement wherein the longitudinal connecting member comprises:
a) a rigid anchor member portion with a first diameter in engagement with a first of the bone anchor attachment structures, the anchor member portion having a longitudinal axis; b) a flexible extension member with a second reduced diameter extending from an end thereof, the extension member attached to and extending from the anchor member portion and is initially tensioned along the longitudinal axis to a steady state length and thereafter can be further tensioned when the assembly is fully assembled by releasing a stiff end structure; c) a compressible outer spacer, the extension member being received in the spacer, the spacer being positioned between the at least two bone anchor attachment structures; and d) a sleeve, the extension member being received within the sleeve and in slidable relationship therewith, the sleeve being in engagement with the second of the bone anchor attachment structures.

6 . The improvement of claim 5 , further comprising an elastic bumper, the extension member being received within the bumper and the bumper engaging the sleeve.

7 . The improvement of claim 5 , further comprising a fixation structure secured to the extension member at an end thereof opposite the anchor member portion.

8 . The improvement of claim 5 , wherein the extension member is fixed to the anchor member portion at an end thereof.

9 . In a medical implant assembly having at least first and second bone attachment structures cooperating with a longitudinal connecting member, the improvement wherein the longitudinal connecting member comprises:
a) a rigid anchor member portion with a first diameter in engagement with the first of the bone attachment structures, the anchor member portion having a longitudinal axis; b) a bendable core extension member with a second reduced diameter along a length thereof, the core extension attached to and extending from the anchor member portion, the extension having a linear and a non-linear configuration and is initially tensioned along the longitudinal axis to a steady state length and thereafter can be further tensioned when the assembly is fully assembled by releasing a stiff end structure; c) a compressible outer spacer, the core extension member being received in the spacer, the spacer being positioned between the first and second bone attachment structures; and d) a sleeve, the core extension member being received within the sleeve and in slidable relationship therewith, the sleeve being in engagement with the second of the bone attachment structures.

10 . A medical implant assembly with at least first and second bone attachment structures including:
a) a longitudinal connecting member having a stiff portion with a first diameter secured to at least the first bone attachment structure having a longitudinal axis, the stiff portion being coaxial with a less stiff core extension portion with a second diameter of reduced width relative to the stiff portion first diameter, the core extension portion being in slidable relation with the second bone attachment structure, and is initially tensioned along the longitudinal axis to a steady state length and thereafter can be further tensioned when the assembly is fully assembled by releasing a stiff end structure; b) a solid non-slitted outer spacer positioned entirely outside of the core extension portion and between the first and second bone attachment structures, the spacer being in slidable relation with the core extension portion; and c) an end fixing structure and an elastic bumper, both the wherein at least one sleeve is positioned around and between the end fixing structure and the elastic bumper being positioned entirely outside of the second bone attachment structure, wherein the bumper is positioned around the core extension portion and between the fixing structure and the second bone attachment structure, and wherein the bumper is in slidable relation with the core extension portion; and wherein d) the fixing structure is slidable on the core section, compressible against the bumper and securable to the core extension portion.

11 . The assembly according to claim 10 , wherein the core extension portion is maintained in tension by axial elastic distraction from the bumper.

12 . The assembly according to claim 10 , wherein the core extension portion is made of at least one of a polymer, PEEK and a non-metal.

13 . The assembly according to claim 10 , core extension portion and the bone attachment structure, the sleeve being secured to at least the bone attachment structure.

14 . The assembly according to claim 10 , wherein the tensioned core extension portion is adapted to provide resilient bending stiffness for the longitudinal connecting member while cooperating with the bone attachment structures.

15 . The according to claim 10 , wherein the end fixing structure is positioned entirely outside of the bumper.

16 . The assembly according to claim 10 , wherein the bumper and the spacer are positioned entirely outside of the sleeve.

Assignees

• Jackson Roger P

Inventors

• Jackson Roger P

Classifications

• A61B17/7026 Primary

  with a part that is flexible due to its form · CPC title

• A61B17/702

  having a core or insert, and a sleeve, whereby a screw or hook can move along the core or in the sleeve · CPC title

• A61B17/705

  for linking adjacent ends of longitudinal elements · CPC title

• A61B17/7037

  wherein pivoting is blocked when the rod is clamped · CPC title

• A61B17/7004 Primary

  with a cross-section which varies along its length (A61B17/7019 takes precedence) · CPC title