Surgical Stapler Knife MIM-HIP Manufacturing for Precision and Low Waste
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Solution Overview
Problem
Existing surgical staplers face challenges in efficiently manufacturing knives with precise tolerances and reduced waste, as conventional machining techniques are time-consuming and costly.
Innovation Solution
The use of a near-net metal injection molding (MIM) process followed by hot isostatic pressing (HIP) and selective machining to achieve the desired dimensions and surface finishes for the knife components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional machining techniques are used to manufacture knife components, then precise tolerances and surface finishes can be achieved, but the manufacturing process becomes time-consuming and costly
Solution Approach 1:
The knife component is pre-formed using near-net metal injection molding (MIM) to achieve close-to-final dimensions and complex geometries before any machining operations. This preliminary shaping action eliminates the need for extensive material removal and multiple machining steps, thereby reducing manufacturing time and cost while maintaining precision requirements
Solution Approach 2:
The manufacturing process transitions from conventional direct machining to a hybrid approach combining near-net MIM with selective machining. This parameter change in the manufacturing methodology allows the component to be formed in a near-final state with controlled density and microstructure through HIP processing, requiring minimal subsequent machining to achieve target tolerances and surface finishes
2Manufacturing precision
If conventional machining techniques are used to manufacture knives, then precise dimensions can be achieved, but material waste increases and manufacturing cost rises
Solution Approach 1:
The near-net MIM process forms the knife component with dimensions very close to the final required geometry before any machining operations. This preliminary action eliminates the need for extensive material removal that would otherwise be required with conventional machining, thereby dramatically reducing material waste while maintaining precise dimensional tolerances
Solution Approach 2:
Instead of machining the entire knife component, only specific localized areas requiring precise dimensions or surface finishes are selectively machined. The near-net MIM process provides the base geometry with adequate precision for most surfaces, and selective machining applies only where absolutely necessary, minimizing material removal and waste
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 allows for the efficient, cost-effective, and robust manufacturing of surgical stapler knives with improved sliding interfaces and reduced wear, enhancing the performance and longevity of the surgical instrument.
Implementation Method 1
forming the knife using metal injection molding
Implementation Method 2
hot isostatic pressing the knife
Data Source
AI summary
A method is used to manufacture a knife of an end effector of a surgical instrument. The method includes forming the knife using metal injection molding. The knife has at least one feature having a molded shape. The method also includes machining the at least one feature of the knife to have a machined shape without machining the entire knife. The method also includes incorporating the knife into the end effector of the surgical instrument.