Hemostatic Surgical Blade Composite Structure
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Solution Overview
Problem
Existing hemostatic surgical blades face challenges in delivering adequate heat to the cutting edge while maintaining a sharp, durable edge, leading to inefficiencies in cutting and hemostasis during surgery, due to limitations in thermal conductivity and edge durability.
Innovation Solution
A symmetrical, five-layer laminar cutting portion structure with a cutlery-grade martensitic stainless steel core and oxygen-free high conductivity copper layers, combined with austenitic stainless steel buttressing layers, enhances thermal conductivity and maintains edge hardness, along with a thin non-stick coating to prevent thermal degradation and maintain sharpness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If high thermal conductivity materials are used for the blade, then heat delivery to tissue is improved, but the cutting edge becomes dull prematurely due to corrosion and heat conduction to the handle
Solution Approach 1:
The blade is constructed as a composite structure with a copper core providing high thermal conductivity for heat delivery to tissue, and a stainless steel cutting edge providing mechanical durability and sharpness. This composite design allows each material to perform its optimal function without the drawbacks of using either material alone.
Solution Approach 2:
Different portions of the blade are made from materials optimized for their specific functions: the core is copper for thermal conductivity, while the cutting edge is stainless steel for mechanical properties. This local differentiation of material properties resolves the contradiction between heat delivery and edge durability.
2Reliability
If conventional steel or martensitic stainless steel is used for the blade, then a sharp and durable cutting edge is maintained, but thermal conductivity is insufficient for adequate heat delivery
Solution Approach 1:
The blade combines copper for thermal conductivity with martensitic stainless steel for cutting edge durability, creating a composite structure where each material's strengths are utilized to overcome the other's weaknesses.
Solution Approach 2:
The copper core provides thermal conductivity throughout the blade body, while the stainless steel cutting edge provides localized mechanical sharpness and durability, allowing both heat delivery and cutting performance to be optimized simultaneously.
3Use of energy by moving object
If thick-film printed heating elements are used, then heat delivery is improved, but the blade must be heated to high temperatures for extended periods causing annealing and edge softening
Solution Approach 1:
The heating element is divided into multiple segments with independent temperature control, allowing heat to be applied locally and on-demand rather than requiring prolonged heating of the entire blade, thus preventing annealing of the cutting edge.
Solution Approach 2:
The heating system transitions from static, prolonged heating to dynamic, on-demand heating where only the necessary portions of the blade are heated briefly during cutting, reducing thermal exposure of the cutting edge and preventing softening.
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 enables effective heat transfer for hemostasis while maintaining a sharp cutting edge, reducing bleeding and improving surgical precision and efficiency by ensuring the blade remains sharp and durable throughout the procedure.
Implementation Method 1
A symmetrical, five-layer laminar cutting portion structure with a cutlery-grade martensitic stainless steel core and oxygen-free high conductivity copper layers
Implementation Method 2
This technique uses a heated instrument to contact bleeding tissue. The heat is transferred from the instrument to the incised (or torn) tissue to thermally reform collagen
Data Source
AI summary
A hemostatic surgical blade is formed of five symmetrically layers. A martensitic stainless steel core with oppositely disposed faces is bonded to layers exhibiting a high thermal conductivity which, in turn, are supported by buttressing layers of austenitic stainless steel. A thin aluminum layer is deposited on one side of blade blanks to enable chemical reaction bonding to electrically insulative dielectric inks formulated for use with aluminum substrates. The blade is heated by a blade heating circuit that is manufactured by thick-film printing and firing an electrically resistive heating element layer and an electrically conductive leads on an electrically insulative dielectric layer with all layers subsequently covered by a thick-film printed electrically insulative dielectric overcoat. Tissue contacting portions of blade are coated with a very thin non-stick coating. The surgical blade operates at a temperature below the threshold for pyrolysis and/or thermal decomposition of human tissue and body fluids.