Load-sharing insert for ultrasonic surgical blade friction reduction
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Solution Overview
Problem
Traditional surgical saws generate excessive heat and produce uneven cuts during bone osteotomies, leading to tissue damage and impaired healing, while existing irrigation systems and surface modifications on cutting blades are inadequate in addressing these issues.
Innovation Solution
An ultrasonic surgical blade with a plurality of sockets and body inserts featuring a flexible perimeter joint and load-sharing member, which reduces frictional forces by limiting real contact area and decouples frictional forces from the blade body, using a low-friction material and creating an air-filled space for thermal insulation and debris relief.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional oscillating or reciprocating saw blades are used to cut bone, then cutting capability is achieved, but excessive heat is generated at the blade-bone interface due to frictional forces
Solution Approach 1:
A layer of bone particulate matter is introduced as an intermediary between the blade and bone surfaces. This particulate layer acts as a lubricant that reduces direct contact friction, thereby significantly decreasing heat generation at the blade-bone interface while maintaining effective cutting capability
Solution Approach 2:
The bone particulate matter, which would normally be considered waste debris, is converted into a beneficial lubricating layer. This transforms the harmful frictional contact into a low-friction interface that protects both the blade and bone from excessive heat and damage
2Temperature
If irrigation systems are used to flush the osteotomy site, then heat removal is improved, but visualization of the osteotomy site deteriorates
Solution Approach 1:
The bone particulate matter naturally accumulates and maintains itself as a lubricating layer during the cutting process without requiring external irrigation systems. This self-sustaining mechanism reduces heat generation intrinsically, eliminating the need for irrigation that would compromise surgical visualization
3Manufacturing precision
If more teeth are added to the saw blade edge, then cutting precision is improved, but the blade complexity and potential for tissue entanglement increase
Solution Approach 1:
The traditional mechanical cutting action using multiple serrated teeth is replaced with a ultrasonic vibration-based cutting mechanism. This substitution allows for smoother cuts with fewer blade features, reducing complexity and the risk of soft tissue entanglement while maintaining or improving cutting precision
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 significantly reduces heat generation and frictional forces, enhancing cutting efficiency and preventing tissue damage, while maintaining a stable temperature along the blade body, thus promoting better healing and visualization during surgical procedures.
Implementation Method 1
limiting the real contact area of the blade that is in direct contact with adjacent bone surfaces, the frictional forces generated during translation are significantly reduced
Implementation Method 2
creating an air-filled space for thermal insulation
Data Source
AI summary
A cutting blade with multiple body inserts, each comprising a load-sharing member and a flexible perimeter joint. These inserts reduce the magnitude of frictional forces acting on the blade's body. The load-sharing member, in particular, acts as a point contact between the material being cut, such as bone, and the cutting blade. As such, the frictional forces exerted act only on the load-sharing member as opposed to the entire body. By limiting the real contact area, the magnitude of friction generated during operation is reduced. Additionally, the load-sharing members create a thermally insulating space between the body and the material being cut. The functionality of these body inserts, however, relies on the flexible perimeter joint. The flexible perimeter joint isolates the effects of frictional forces to the load-sharing member by preventing direct contact between the load-sharing member and the surrounding body.