Therapy device with fixated distraction distance
AssigneeBaxano Surgical, Inc.
InventorsStephen D. Ainsworth, Leighton LaPierre
Life of this patent
Estimating the term…
Abstract
Assemblies for implantation across one or more adjacent bones to allow for control of the distance between bone anchors. Control of distance between bone anchors may be provided by one inter-anchor element pushing the pair of bone anchors apart and a second inter-anchor element pulling the pair of bone anchors together. Control of distance between bone anchors may be provided through use of dissimilar thread pitch. Compression of the space between bone anchors through controlled movement of a pair of anchored bone anchors towards one another.
Claims34
A method for setting a distance between a pair of bone anchors consisting of a proximal bone anchor inserted into a proximal bone and a distal bone anchor inserted into a distal bone, the method comprising:
- rotating a first inter-anchor element threadedly engaged with the proximal bone anchor to set a minimum distance between the pair of bone anchors;
- and
- rotating a second inter-anchor element threadedly engaged with the distal bone anchor to set a maximum distance between the pair of bone anchors with the maximum distance equal to the previously set minimum distance.
A method for controlling a distance between a pair of bone anchors consisting of a distal bone anchor and a proximal bone anchor, the method comprising:
- implanting the distal bone anchor in a distal bone;
- implanting the proximal bone anchor in a proximal bone that is adjacent to and proximal to the distal bone;
- threadedly advancing distally a first inter-anchor element within the proximal bone anchor to push against the distal bone anchor;
- inserting a threaded portion of a second inter-anchor element through a channel within the first inter-anchor element and engaging a threaded bore within the distal bone anchor;
- and
- threadedly advancing the second inter-anchor element to pull the pair of bone anchors together until the distance between the pair of bone anchors is fixed.
A method for setting a distance between a proximal bone anchor anchored in a proximal bone and a distal bone anchor in a distal bone adjacent to the proximal bone;
- the method comprising rotating a first inter-anchor element threadedly engaged with the proximal bone anchor and the distal bone anchor to use dissimilar thread pitch to set the distance between the proximal bone anchor and the distal bone anchor.
An assembly for implantation across a proximal bone and an adjacent distal bone comprising:
- an externally threaded distal anchor for engagement with the distal bone;
- an externally threaded proximal anchor for engagement with the proximal bone;
- a spanning component that is threadedly engaged with the proximal anchor and extends into an interior of the distal anchor, wherein the spanning component may be rotated to set a minimum distance between a distal end of the proximal anchor and a proximal end of the distal anchor;
- and
- a compression inducing element adapted to:
- extend into an open interior of the spanning component;
- engage a shoulder within an interior of the proximal anchor, the shoulder facing a proximal end of the proximal anchor;
- engage a threaded bore within an interior of the distal anchor;
- and
- receive rotational input at a driver engagement section at a proximal end of the compression inducing element accessible via the proximal end of the proximal anchor such that a driver engaged with the driver engagement section of the compression inducing element has a capacity to reduce a distance between the distal anchor and the proximal anchor by pulling the distal anchor towards the proximal anchor.
An assembly for implantation across two adjacent bones, a proximal bone and a distal bone comprising:
- a distal anchor for engagement with the distal bone;
- a proximal anchor for engagement with the proximal bone;
- and
- a distraction inducing element adapted to engage a threaded section within an interior of the proximal anchor and to engage a threaded section within an interior of the distal anchor to form an adjustable but substantially rigid structure such that rotation of the distraction inducing element has a capacity to alter a distance between the distal anchor and the proximal anchor through use of dissimilar thread pitch between a thread pitch for the threaded section within the interior of the proximal anchor and a thread pitch for the threaded section within the interior of the distal anchor.
An assembly for insertion across a space between a proximal bone and a distal bone, the assembly comprising:
- a distal anchor for threaded engagement with the distal bone;
- a proximal anchor for threaded engagement with the proximal bone;
- a spanning component with an external thread adapted to engage an internal thread within the proximal anchor so that a distal end of the spanning component can be selectively advanced beyond a distal end of the proximal anchor to limit movement of the distal anchor towards the proximal anchor;
- and
- a compression inducing element with a distal end that passes through a bore in the spanning component and engages a threaded bore in the distal anchor, the compression inducing element having a distal facing shoulder which engages a proximal facing shoulder within the proximal anchor so that rotation of the compression inducing element draws the distal anchor towards the proximal anchor to decrease distraction of a space between the distal bone and the proximal bone by decreasing a distance between the distal anchor and the proximal anchor until limited by the spanning component.
Dependencies are inferred from the claim text.