Metacarpal bone stabilization device

Abstract

A device and method for stabilizing a broken bone while it heals is disclosed. The device is preferably a metal rod that has a threaded portion. The device is positioned into a bone, such as a metacarpal bone, by forming an opening in the bone suitable for receiving the device, and inserting it into the opening wherein the threaded portion retains the device in position.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of application Ser. No. 13 / 940,173 filed on Jul. 11, 2013 titled “METACARPAL BONE STABILIZATION DEVICE”, which claims priority under 35 U.S.C. 119(e) to U.S. Provisional Patent Application No. 61 / 671,021, filed Jul. 11, 2012.FIELD OF THE INVENTION[0002]The present invention relates to a device implantable in a bone to stabilize it while it heals, and which is particularly suitable for use in a metacarpal bone.BACKGROUND OF THE INVENTION[0003]The palm of the hand is made up of bones called metacarpals, and a metacarpal connects each finger and thumb to the hand. Each finger and thumb is formed of bones called phalanges. The connection of the phalanges to the metacarpals is called a “knuckle” joint or metacarpophalangeal joint (MCP joint), and acts like a hinge when the fingers or thumb are bent.[0004]In each finger, there are three phalanges that are separated by two joints called the interphalangeal join...

AI Technical Summary

Benefits of technology

[0008]The present invention solves the problems associated with repairing a metacarpal bone by providing a device that is a unique combination of a nail and a screw, which has threads only along 30% or less of its length. In this manner, the device can be inserted into the bone without damaging the bone because it is only threaded into a small portion of an opening formed in the bone. Further, the device is anchored into the bone, which eliminates migration and eliminates the need for a second operation to remove the device.

Problems solved by technology

Damage to the metacarpal bone may occur as a result of a sprain or fracture.

Problems with the nail are that, because it is not anchored in the bone, it can migrate through the metacarpal bone and into surrounding tissue.

Sometimes this can result in damage to soft tissue, such as a severed or damaged tendon or cartilage, and / or cause pain.

Another problem with the nail is that, because it can migrate, a second surgery is required to remove it.

Additionally, the proximal end of pins and nails can cause tendon irritation, tendon rupture or skin irritation and infection.

A major problem with such a technique (which to the inventors' knowledge is not utilized and is not prior art) is that the torque required to place a screw into the length of a metacarpal bone (which is a relatively thin, delicate bone) is high.

Such a procedure would be lengthy, and there would be a possibility of bone damage, or damage to the driving head of the screw, which could prevent complete insertion into the opening formed in the bone.

Current screws are not designed specifically for intramedullary placement.

For instance, the current screws are frequently not long enough.

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