Disposable Hip Reamer Production via Flat Panel Stamping
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Solution Overview
Problem
The high complexity and cost of producing a reamer for milling the acetabular cavity during hip surgery, particularly due to the intricate design of the rigid base, make it impractical for disposable use in sterile surgical environments.
Innovation Solution
A method involving the separate production of a rigid base and a thin-walled, perforated cutter body through cutting and press-stamping of flat metal panels, allowing for a quick, inexpensive, and automated process that simplifies the formation of the coupling interface and teeth, enabling a low-cost reamer for single-use applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the rigid base is produced using traditional complex manufacturing methods, then the coupling interface and radial receiving lugs have high structural integrity, but the production cost and complexity increase significantly
Solution Approach 1:
The rigid base is divided into separate functional elements (coupling interface branches and radial receiving lugs) that are formed independently through stamping operations on a flat panel, then assembled together. This segmentation allows each element to be optimized for its specific function while simplifying the overall manufacturing process.
Solution Approach 2:
The coupling interface branches are formed with U-shaped or V-shaped cross-sections through stamping operations that deform the flat panel in specific ways. This dimensional transformation creates rigid three-dimensional structures from two-dimensional material, achieving structural integrity through controlled deformation rather than complex assembly.
2Stability of the object's composition
If the rigid base is produced by traditional molding methods, then the coupling interface achieves satisfactory rigidity, but the production time and cost increase
Solution Approach 1:
The coupling interface branches are pre-formed with their final U-shaped or V-shaped cross-sections during the initial stamping operation on the flat panel, before assembly. This preliminary formation eliminates the need for subsequent complex molding or machining operations, significantly reducing production time while maintaining rigidity.
Solution Approach 2:
Traditional molding methods are replaced with stamping and deformation operations that form the coupling interface directly from flat metal panels. This substitution uses simpler, faster mechanical processes to achieve the same structural outcome, improving production efficiency.
3Reliability
If the reamer is designed for disposable use in sterile surgical environments, then patient infection risk is reduced, but the production cost must be minimized
Solution Approach 1:
The entire reamer assembly, including the rigid base with coupling interface and the cutter body, is designed as a disposable single-use instrument. The simplified stamping-based manufacturing process enables mass production at low cost, making disposable use economically viable and ensuring sterility without requiring expensive reprocessing or sterilization infrastructure.
Solution Approach 2:
The production methods for the rigid base and cutter body are merged into a coordinated stamping and assembly process. Both components are formed from flat panels using similar manufacturing techniques, then assembled together as a complete disposable unit, streamlining production and reducing overall manufacturing cost.
4Shape
If the cutter body is formed into a hemisphere after attaching to the rigid base, then the final geometry is achieved, but the teeth formation becomes more difficult
Solution Approach 1:
The teeth are formed on the flat cutter body panel during the initial stamping operation, before the component is shaped into a hemisphere and assembled to the rigid base. This preliminary formation of teeth on the flat surface is significantly easier than attempting to form teeth on the curved hemispherical surface, reducing manufacturing difficulty and tooling complexity.
Solution Approach 2:
The conventional sequence of forming the hemispherical shape first and then adding teeth is inverted. Instead, the teeth are formed first on the flat panel, then the component is shaped into a hemisphere. This reversal of the manufacturing sequence makes teeth formation much easier and more cost-effective.
Data Source
AI summary
Method for producing a reamer such as a milling cutter intended to mill the acetabular cavity of a patient, the reamer including a rigid base with an interface for coupling to a tool holder, and including a cutter body which has a thin wall and is perforated and toothed. The rigid base is produced separately from the cutter body, by cutting out and drawing a first flat metal blank in a press.