Surgical Stapler Knife MIM and HIP for Selective Precision Machining
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Solution Overview
Problem
Conventional surgical stapling instruments face inefficiencies in manufacturing processes, particularly with machining techniques that are time-consuming, costly, and wasteful, and require precise tolerances for optimal performance.
Innovation Solution
The use of metal injection molding followed by hot isostatic pressing and selective machining to create surgical knives with specific features, such as cutting edges and pins, that enhance performance and reduce wear, allowing for tighter tolerances and improved surface finishes without machining the entire knife.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional machining techniques are used to manufacture surgical knives, then precise tolerances and surface finishes can be achieved, but the manufacturing process becomes time-consuming, costly, and wasteful
Solution Approach 1:
The surgical knife is divided into two parts: a molded body produced by metal injection molding and separate insert features (cutting edges, pins, flanges) that are machined independently and then assembled. This segmentation allows the body to be manufactured efficiently through molding while only the critical features require precision machining, thereby improving overall manufacturing productivity without sacrificing precision where needed.
Solution Approach 2:
The basic knife body geometry is pre-formed through metal injection molding before the final precision features are added. This preliminary action creates a near-net-shape component that requires minimal material removal and machining, significantly reducing manufacturing time and cost while maintaining the ability to achieve precise tolerances on the inserted features.
2Manufacturing precision
If conventional machining techniques are used to manufacture surgical knives, then precise features can be created, but material waste and cost increase
Solution Approach 1:
By segmenting the knife into a molded body and separate insert features, the process eliminates the need to machine the entire knife from a solid block. The molded body is created with minimal material waste through near-net-shape forming, and only the small insert features require precision machining, dramatically reducing overall material waste.
Solution Approach 2:
The manufacturing approach changes from subtractive machining of the entire component to a combination of formative molding for the body and selective machining of inserts. This parameter change in the manufacturing process allows the majority of the material to be formed rather than carved, reducing material waste while maintaining precision through the inserted features.
3Productivity
If selective machining is used instead of full machining, then manufacturing efficiency improves, but ensuring proper integration of molded and machined features becomes critical
Solution Approach 1:
The knife is segmented into a molded body and separate insert features that are machined independently. This segmentation allows each component to be optimized for its specific manufacturing process, with the body produced efficiently through molding and the features produced with precision machining, while reducing the complexity of integrating multiple machining operations.
Solution Approach 2:
The molded body acts as an intermediary that receives and integrates the separately manufactured insert features. This intermediary component provides a standardized interface and mounting structure that facilitates the reliable integration of the machined features while maintaining the manufacturing efficiency benefits of selective machining.
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 approach results in more efficient, cost-effective, and robust surgical knives with improved sliding interfaces and reduced cutting forces, enhancing the performance of surgical stapling instruments.
Implementation Method 1
forming the knife using metal injection molding
Implementation Method 2
hot isostatic pressing to create surgical knives
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.