Acetabular Augment Reaming Guide for Precise Bone Defect Preparation
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Solution Overview
Problem
Current bone preparation methods for joint revision procedures are inefficient due to the use of unguided surgical instruments, leading to unpredictable and non-uniform bone defects, which can disrupt the complementary relationship between bone augments and joint prostheses, resulting in poor structural integrity and increased complexity in achieving a proper fit.
Innovation Solution
The acetabular wedge augment reaming tool, comprising a scoop assembly, acetabular reamer assembly, and tool guide, allows for precise reaming and adjustment to accommodate various sizes of acetabular cup and augment combinations, using a modular design with markings for alignment and a reamer guide that moves along a specific axis to ensure accurate fitting of the augment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If unguided surgical instruments are used for bone preparation, then the surgical procedure can be performed with simple tools, but the bone defects become unpredictable and non-uniform in shape
Solution Approach 1:
The patent introduces a guide instrument as an intermediary tool that mediates between the simple surgical reamer and the complex requirement for uniform bone defect preparation. The guide instrument contains a template with a recess that receives the reamer, ensuring the reamer follows a predetermined path and creates a uniform bone defect shape while keeping the actual cutting tool simple.
Solution Approach 2:
The guide instrument is prepared in advance with a template design that defines the desired bone defect geometry. By pre-configuring the guide instrument with the correct template shape and size, the surgeon ensures that the bone preparation will result in the precise geometry needed for augment-socket complementarity without having to perform complex adjustments during surgery.
2Manufacturing precision
If iterative cutting and evaluation is performed to match bone contours to augment, then the bone can be contoured to fit, but the surgical time increases significantly
Solution Approach 1:
The guide instrument template is designed in advance to match the augment geometry. By pre-configuring the template with the correct contours and dimensions, the surgeon eliminates the need for iterative cutting and evaluation during surgery. The template directly guides the reamer to create a bone defect that is ready to receive the augment in a single pass.
Solution Approach 2:
The guide instrument template creates a precise copy or replica of the augment's required interface geometry. The template's recess is designed to match the augment's outer surface, and this copied geometry is transferred to the bone through the guided reaming process, ensuring perfect complementarity without iterative adjustments.
3Strength
If bone defects are filled with weight bearing augments, then the structural integrity of the joint is improved, but the complexity of achieving proper fit between augment and prosthesis increases
Solution Approach 1:
The guide instrument serves as an intermediary that ensures proper geometric matching between the augment and prosthesis. By using the guide template to prepare the bone defect, the system maintains the complementary relationship between augment and acetabular cup, reducing the complexity of achieving proper fit while preserving the structural benefits of the augment.
Solution Approach 2:
The guide instrument allows for parameter adjustments in the bone preparation process, such as depth control and angular orientation, to match the specific augment and prosthesis combination being used. By adjusting these parameters during guide instrument setup, the system achieves proper fit without increasing overall procedural complexity.
Data Source
AI summary
An acetabular wedge augment reaming tool includes a scoop assembly, an acetabular reamer assembly and a tool guide. The scoop assembly has a scoop configured to be received within an acetabulum and a scoop shaft extending from the scoop. The acetabular reamer assembly has a reamer head and a reamer shaft extending from the reamer head. The tool guide includes a reamer guide housing and a reamer guide positioned within the reamer guide housing and moveable along a first axis relative to the reamer guide housing. The reamer shaft of the acetabular reamer assembly is slidably connected to the reamer guide such that it is moveable along a second axis relative to the reamer guide and the scoop shaft of the scoop assembly is connected to the reamer guide housing.