Kettering University

Other

David LeCronier

Patrick Atkinson

A compression transmission collar apparatus () for implantation into a bone () with a hole () having a hole wall () comprising an intramedullary nail () defining a bore () and a threaded fastener () and a compression transmission collar () including an exterior face () and a top edge () and a bottom edge () and a first end () intersecting the top edge () at an acute angle and the bottom edge () at an obtuse angle and a second end () intersecting the top edge () at an obtuse angle and the bottom edge () at an acute angle and the first end () partially overlapping and opposing the second end () to define a slit () such that applying a compressional load to the top edge () causes the first end () to slide relative to and along the second end () causing the compression transmission collar () to compress axially and expand radially pressing the exterior face () against the hole wall ().

Compression transmission collar for fastening

An intramedullary nail () defining a bore () is inserted into a medullary canal () of a bone (). A threaded fastener () has a compression portion () presenting a compression portion diameter (D) and a threaded portion () presenting a threaded portion diameter (D). The fastener () extends through a near cortex hole () and/or a far cortex hole (), and the threaded portion () threadedly engages the bore (). A compression transmission device () is disposed between a head () of the fastener () and the intramedullary nail () for transmitting the compressional load of the threaded fastener () to the intramedullary nail (). An interior space of the compression transmission device () is greater than the compression portion diameter (D) providing space about the threaded fastener () for allowing the fastener axis (A) to be variously disposed relative to the interior space.

Easily implantable and stable nail-fastener for skeletal fixation and method

A compression transmission collar apparatus () for implantation into a bone () with a hole () having a hole wall () comprising an intramedullary nail () defining a bore () and a threaded fastener () and a compression transmission collar () including an exterior face () and a top edge () and a bottom edge () and a first end () intersecting the top edge () at an acute angle (&#x3b1;) and the bottom edge () at an obtuse angle (&#x3b1;) and a second end () intersecting the top edge () at an obtuse angle &#x3b1;) and the bottom edge () at an acute angle &#x3b1;) and the first end () partially overlapping and opposing the second end () to define a slit () such that applying a compressional load to the top edge () causes the first end () to slide relative to and along the second end () causing the compression transmission collar () to compress axially and expand radially pressing the exterior face () against the hole wall ().

An intramedullary nail () for insertion into the medullary canal () in a bone () surrounded by the cortex () and defines a bore () extending transverse to the intramedullary nail (). A threaded fastener () extends along a fastener axis (A) and has a compression portion () having a compression portion diameter (D), and a threaded portion () having a threaded portion diameter (D) extending through a near cortex hole () and a far cortex hole (), both holes () radially overlapping the bore () and the threaded portion diameter (D) threadedly engaging the bore (). A compression transmission device () has an exterior () and an interior () and defines an interior space for transmitting the compressional load of the threaded fastener () to the intramedullary nail (). The threaded fastener () extends through the compression transmission device () and the intramedullary nail () and the far cortex hole () for threadedly engaging the bore () and fixating the intramedullary nail () within the medullary canal (). The interior space of the compression transmission device () is greater than the compression portion diameter (D) of the fastener () for providing space at least partially about the threaded fastener () for allowing the fastener axis (A) to be variously disposed relative to the interior space.

Growing community of inventors

Oxford, MI, United States of America

David LeCronier