Acetabular Reamer Tooth Stamping for Uniform Cutting Edges
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Solution Overview
Problem
Current methods for producing reamers used in surgical hip operations are lengthy, costly, and result in reamers with weak structural rigidity and unreliable cutting characteristics, leading to rapid wear and increased risk of infection due to variable cutting edge uniformity and the need for manual sharpening.
Innovation Solution
A method involving stamping a hemispherical hollow cutter body with a punch and anvil to form teeth, where the wall is thinned adjacent to the hole, providing controlled and reproducible cutting edges through local cold working, enhancing structural strength and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If teeth are formed by folding a tongue between a punch and an anvil, then the production method is simpler, but the tooth has weak structural rigidity and tends to be deformed when forces are applied
Solution Approach 1:
The patent changes the geometric parameters of the tooth structure by forming a folded tongue with specific dimensions and angles. The tongue is folded at a precise angle (e.g., 45 degrees) and positioned at a specific distance from the cutting edge, creating a structure that balances flexibility and strength. This parameter optimization allows the tooth to maintain structural rigidity while being formed through a simple stamping process.
2Manufacturing precision
If the cutting edge is formed by machining prior to tongue raising, then the cutting edge is accurate, but the production method becomes lengthy and costly
Solution Approach 1:
The patent performs preliminary action by pre-forming the tongue structure with the correct geometry and position during the stamping process itself, rather than adding it later through machining. The tongue is formed with the appropriate fold angle and positioning before the cutting edge is finalized, which eliminates subsequent machining steps while maintaining precision through controlled deformation of the material.
Solution Approach 2:
The patent merges multiple operations into a single stamping process. The formation of the tongue, the positioning of the cutting edge, and the shaping of the tooth structure are all accomplished in one operation rather than through separate machining steps. This consolidation reduces production time and cost while maintaining manufacturing precision through the precision of the stamping die.
3Manufacturing precision
If manual sharpening is performed on each tooth, then cutting characteristics can be improved, but the production cost increases and automation is not possible
Solution Approach 1:
The patent implements self-service by designing the stamping process to automatically produce teeth with uniform cutting characteristics without requiring subsequent manual sharpening. The precision stamping die and controlled deformation process inherently create consistent tooth geometry and cutting edges across all teeth, making the production process self-sufficient and eliminating the need for manual intervention.
Solution Approach 2:
The patent uses parameter control in the stamping process to ensure uniform cutting characteristics. By precisely controlling the stamping force, die geometry, material properties, and tongue folding angle, the process produces teeth with consistent dimensions and cutting edge quality. This parameter optimization eliminates the need for manual sharpening while maintaining high uniformity across all teeth.
4Productivity
If the chamfer is used to form the tooth by stamping, then production is faster, but the cutting capabilities are inadequate and manual sharpening is required
Solution Approach 1:
The patent optimizes the stamping parameters including the punch geometry, stamping force, and tongue dimensions to create an effective cutting edge directly during the forming process. By adjusting these parameters, the folded tongue structure develops sufficient cutting capability without requiring subsequent sharpening, thus maintaining both high productivity and adequate cutting performance.
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
This method reduces production costs and time, enables more reliable and durable cutting characteristics, facilitating automation and repeated use while minimizing infection risks by ensuring uniform cutting edges.
Implementation Method 1
plastically deforming, by stamping, a portion of wall extending radially from, and away from the hole formed in the wall, to form the tooth
Implementation Method 2
in the stamping of the tooth, a zone of the deformed portion of wall, adjacent to the hole, is thinned and pressed by the punch against an anvil
Data Source
AI summary
A method for the production of a reamer, such as a burr for milling a patient's acetabular cavity, including a substantially hemispherical, hollow cutting body with a perforated wall. The method includes a step of forming at least one tooth by stamping the wall, during which an area of the thinned portion of the wall, adjacent to a hole, is pressed between a punch and an anvil.