Shape-Memory Guidance Tool for Tibial Intramedullary Channels
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Solution Overview
Problem
Conventional surgical procedures for forming intramedullary channels in bones, such as during total ankle replacement, often require violating additional bones, increasing surgery length and risk of infection.
Innovation Solution
A guidance tool with a shape memory section and centering mechanism is used to guide a cutting tool, minimizing the violation of adjacent bones by forming the intramedullary channel within the tibia without affecting the talus and calcaneus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional techniques are used to form the intramedullary channel, then the channel can be formed along the mechanical axis of the tibia, but additional bones (talus and calcaneus) must be violated, increasing surgery length and infection risk
Solution Approach 1:
A guidance tool with a curved shape acts as an intermediary device that fits within the intramedullary canal of the tibia and guides the cutting tool. This mediator allows the cutting tool to follow the curved path through the tibia without requiring violation of the talus and calcaneus bones, thus resolving the contradiction between achieving precise channel formation and avoiding harm to adjacent bones
Solution Approach 2:
The guidance tool is designed with a curved shape that matches the natural curvature of the intramedullary canal. This curvature allows the tool to navigate through the tibia along a curved path rather than a straight line, enabling access to the mechanical axis without violating the talus and calcaneus bones at the distal end
2Manufacturing precision
If conventional techniques are used to form the intramedullary channel, then the channel can be formed, but the surgery length increases and infection risk increases
Solution Approach 1:
The guidance tool serves as a mediator that enables direct access to the intramedullary canal through a single incision site. By providing a pre-formed curved pathway, it eliminates the need for sequential bone violations and multiple surgical steps, thereby reducing overall surgery time while maintaining precise channel formation
Solution Approach 2:
The guidance tool is pre-shaped with the correct curvature to match the intramedullary canal geometry. This preliminary preparation of the guidance path allows the cutting tool to follow the exact required trajectory without needing to create or adjust the path during surgery, reducing surgical time and complexity
3Manufacturing precision
If conventional techniques are used to form the intramedullary channel, then the channel can be formed, but the risk of infection and other complications increases
Solution Approach 1:
The guidance tool acts as a sterile intermediary that creates a protected pathway through the bone. By guiding the cutting tool through a pre-formed curved channel within the tibia, it prevents exposure and potential contamination of the intramedullary canal and adjacent bones (talus and calcaneus), thereby reducing infection risk while maintaining channel formation precision
Solution Approach 2:
The curved shape of the guidance tool, which initially seems like a complicating factor, actually converts the potential harm of needing to violate multiple bones into a benefit by providing a protected pathway that isolates the surgical site from external contamination sources
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 method facilitates intramedullary guidance, reducing surgical complications and minimizing the violation of adjacent bones, thereby shortening surgery time and lowering infection risk.
Implementation Method 1
The shape memory section has a curved shape. Cutting the guidance tool allows the shape memory section of the guidance tool to regain its programmed shape.
Data Source
AI summary
A guidance tool includes a body having a length extending from a first end to a second end. The body includes a shape memory section along the length of the body. The shape memory section has a curved shape.