Articulated Guideposts for Complex Bone Socket Reaming
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Solution Overview
Problem
Conventional reaming systems struggle to accurately and efficiently create complex shaped spaces in bone for receiving asymmetric or partially-symmetric sleeves or cones, often removing healthy bone and requiring multiple reaming steps.
Innovation Solution
A reaming system that allows a reamer to move along trajectories offset, angled, or variable relative to the stem axis, using a guidepost that can be pivoted or articulated to form complex shaped sockets, enabling single-step creation of asymmetric or partially-symmetric bone pockets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional reaming systems are used with freehand reaming motions, then the reaming operation can be performed with simple equipment, but it is difficult to execute accurately and may remove healthy bone
Solution Approach 1:
The patent introduces a guide device as an intermediary between the reamer and the bone. The guide device includes a guide post with articulation mechanisms that mediate the reaming motion, translating simple operator input into precise complex trajectories. This intermediary component enables accurate reaming of asymmetric shapes without requiring the operator to directly control complex freehand motions.
2Adaptability or versatility
If symmetric sleeves are used with conventional reaming, then the reaming process is simpler, but they do not always fit patient anatomy and may remove too much healthy bone
Solution Approach 1:
The patent applies asymmetry by designing the guide device to create asymmetric or partially-symmetric bone pockets that match patient-specific anatomy. The guide post can be articulated to different angles and positions, allowing the reamer to carve out asymmetric shapes that conform to the actual anatomic structure rather than forcing the anatomy to fit a symmetric template. This reduces unnecessary removal of healthy bone while achieving proper fit.
Solution Approach 2:
The guide device enables local customization of the bone pocket shape at different locations. By articulating the guide post to different angles during reaming, the operator can create locally adapted geometry that matches the specific anatomic conditions at each region of the bone, rather than applying a uniform symmetric shape throughout.
3Manufacturing precision
If reaming rigs with multiple positions are used to create shaped spaces, then the sleeve shape can be controlled, but the system is difficult to configure, requires multiple reaming steps, and limits sleeve shapes to axial insertion
Solution Approach 1:
The patent transforms the static, multi-position reaming rig into a dynamic system. The guide post incorporates articulation mechanisms (such as ball joints or hinges) that allow continuous adjustment of the reamer trajectory during a single reaming operation. This dynamic capability enables the creation of complex asymmetric shapes in one step rather than requiring sequential positioning and multiple reaming passes with a rigid multi-position rig.
Solution Approach 2:
The patent merges multiple reaming functions into a single integrated guide device. Rather than using a complex rig that holds the reamer in multiple fixed positions requiring separate operations, the articulating guide post combines the functions of positioning, angling, and trajectory control in one device that can be operated continuously in a single step.
4Ease of manufacture
If conventional axial reaming is used, then the reaming operation is straightforward, but it cannot create complex shaped sockets that match asymmetric sleeves
Solution Approach 1:
The patent adds angular and rotational dimensions to the traditionally one-dimensional axial reaming operation. The articulating guide post allows the reamer to move not only axially but also to articulate at various angles and sweep through different orientations. This multi-dimensional motion capability enables creation of complex three-dimensional asymmetric sockets while maintaining operational simplicity for the user.
Data Source
AI summary
Systems and methods for reaming an intramedullary canal of a long bone comprise a trial stem configured to extend into the long bone along an insertion axis and a guide device comprising an adapter configured to couple to the trial stem and a reaming guidepost extending from the adapter along a guide axis, wherein the guide axis and the insertion axis are non-aligned. A method of reaming an intramedullary canal of a long bone to form a complex shaped socket can comprise inserting a stem into the intramedullary canal along an insertion axis, connecting a guide device to the stem, the guide device comprising a guidepost extending along a guide axis and guiding a cannulated reamer along the guidepost to remove bone from the intramedullary canal to form the complex shaped socket, wherein the guide axis and the insertion axis are non-aligned.