Bone positioning guide

What is this patent about?

’819 is related to the field of orthopedic surgery and mechanical bone realignment, specifically addressing the correction of anatomical deformities in the foot. The background context involves the difficulty surgeons face when manually attempting to realign bones, such as the first metatarsal during a bunion correction, while simultaneously trying to maintain that alignment for permanent fixation. Traditional methods often result in inconsistent outcomes because the surgeon must manage complex three-dimensional movements across multiple planes without stable mechanical assistance.

The underlying idea behind ’819 is the use of a mechanical guide that applies controlled, opposing forces between two different bones to achieve a multi-planar correction. By anchoring a tip on a stable reference bone and advancing a bone engagement member against the misaligned bone, the device translates the inventor's insight that a single mechanical action can simultaneously reduce the intermetatarsal angle and correct axial rotation in the frontal plane. This approach replaces manual manipulation with a stable, screw-driven or ratcheted mechanism that holds the bones in a precise, corrected orientation during the preparation and fixation phases.

The claims of ’819 focus on a comprehensive bone positioning system that integrates a positioning guide, a tissue removing instrument, and a fixation device. The independent claims specifically cover a guide operable to move a metatarsal in at least one plane—and specifically multiple planes including the frontal plane—to correct its alignment relative to an opposed cuneiform. The system is designed to facilitate the entire fusion workflow, from the initial mechanical realignment to the preparation of the bone ends and the final application of a fixation device across the tarsometatarsal joint.

In practice, the system works by placing the guide's tip against a stable lateral metatarsal while the concave bone engagement member grips the medial ridge of the first metatarsal. As the clinician actuates the shaft, the first metatarsal is urged toward the second, naturally rotating the bone into a proper anatomical position. Once the desired alignment is achieved, a bone preparation guide is often used to ensure that the cuts made to the metatarsal and cuneiform are perfectly parallel and conforming, which is critical for a successful fusion and long-term stability.

This invention differs from prior approaches by providing a rigid framework that maintains the corrected position hands-free, allowing the surgeon to focus on precise bone resection and hardware placement. Unlike traditional clamps that only provide compression, this system utilizes a fulcrum effect and multi-planar control to address the rotational component of bunion deformities, which is frequently overlooked in standard procedures. By combining the realignment tool with specialized cutting guides, the system ensures that the final orientation of the bones matches the intended surgical plan without the risk of the bones shifting during the procedure.