All-Polymer 4-in-1 Orthopaedic Cutting Block
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Solution Overview
Problem
Current orthopaedic surgical instruments, such as cutting blocks, often require metal inserts for cutting guides, which increase fabrication complexity and cost, and are not optimally suited for injection molding processes, limiting their design and functionality.
Innovation Solution
A polymer 4-in-1 cutting block is designed without metal inserts, comprising two polymer half-blocks that couple to form a single unit with integrated cutting guides, fabricated using injection molding with specialized cores for forming cutting guides, and a method for assembling and securing the block for precise bone resection during orthopaedic procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If metal inserts are used for cutting guides in traditional cutting blocks, then the cutting guides can be formed with precise geometry, but the fabrication complexity and cost increase
Solution Approach 1:
The patent merges the cutting guide geometry directly into the polymer body by forming negative impressions of cutting guides during injection molding. This eliminates the need for separate metal inserts and their associated assembly steps, reducing fabrication complexity while maintaining the precision of cutting guide geometry through controlled molding processes.
Solution Approach 2:
The patent uses master models or cores to create negative impressions of cutting guides within the polymer material during injection molding. This copying process transfers the precise geometry of the cutting guides directly into the polymer body, achieving high manufacturing precision without requiring actual metal inserts to be installed.
2Strength
If metal inserts are used for cutting guides, then the cutting guides provide structural integrity, but the instrument is not optimally suited for injection molding processes
Solution Approach 1:
The patent changes the material parameter from metal inserts to polymer material for the cutting guides. By adjusting the polymer formulation and molding parameters, the cutting guides are formed directly within the polymer body, making the entire instrument optimally suited for injection molding processes while maintaining sufficient structural integrity for surgical use.
Solution Approach 2:
The patent creates a composite structure where cutting guide geometry is embedded within the polymer matrix. This integration of guidance features directly into the polymer material eliminates the need for separate metal components, optimizing the instrument for injection molding while preserving the structural integrity needed for cutting guide functionality.
3Duration of action of stationary object
If traditional cutting blocks with metal inserts are used, then the instruments can be reused, but the fabrication cost and complexity increase
Solution Approach 1:
The patent adopts a disposable approach by forming complete cutting blocks with integrated cutting guides directly from polymer material through injection molding. This eliminates the need for expensive metal inserts and complex assembly processes, making the instruments cost-effective for single-use applications while simplifying fabrication to a single molding operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a cost-effective, injection-moldable orthopaedic surgical instrument with integrated cutting guides, enhancing precision and reducing fabrication complexity, while ensuring the cutting block is specifically designed for single-use orthopaedic procedures, addressing the limitations of traditional cutting blocks with metal inserts.
Implementation Method 1
fabricated using injection molding with specialized cores for forming cutting guides
Implementation Method 2
injection molding process...cooling and solidifying to create the final shape
Data Source
AI summary
An orthopaedic surgical instrument includes an all-polymer 4-in-1 cutting block having a number of polymer cutting guides. In some embodiments, the all-polymer cutting block is be embodied as a multi-piece cutting block, while in other embodiments the all-polymer cutting block is embodied as a single, monolith cutting block. Several methods for fabricating the different all-polymer 4-in-1 cutting blocks are also disclosed.