Extramedullary Bone Cut Positioning System
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Solution Overview
Problem
Current bone cut positioning systems in orthopedic procedures, such as total knee arthroplasty, face challenges in accurately aligning the mechanical axis with the anatomic axis of the femur, leading to potential errors in varus-valgus alignment and requiring invasive intramedullary techniques that increase the risk of infection and systemic embolism.
Innovation Solution
A bone cut positioning system comprising a femoral attachment member with a light emitter and adjustable varus-valgus and flexion-extension components, allowing for extramedullary alignment without the need for an intramedullary rod, which includes a magnetic interface for securing the light emitter and a guide member that can be magnetically coupled to the channel, enabling precise alignment and minimizing bone resection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If intramedullary techniques are used for bone cut positioning, then alignment accuracy can be achieved, but the risk of infection and systemic embolism increases
Solution Approach 1:
The positioning system is divided into separate components: a positioning member with adjustment mechanisms and a guide member. This segmentation allows extramedullary positioning without requiring intramedullary rod insertion, thereby maintaining alignment accuracy while reducing the risk of infection and systemic embolism associated with intramedullary techniques
Solution Approach 2:
The patent introduces an extramedullary positioning member as an intermediary device that achieves precise bone cut alignment without direct intramedullary intervention. This mediator provides the necessary alignment functionality while avoiding the harmful effects of intramedullary rod insertion
2Stability of the object's composition
If guide members are secured to bone using pins or other securement means, then stable positioning is achieved, but the procedure becomes more invasive
Solution Approach 1:
The positioning member incorporates dynamic adjustment mechanisms including varus-valgus adjustment and flexion-extension adjustment, allowing the device to adapt to different anatomical configurations while maintaining stable positioning without requiring invasive securement methods
Solution Approach 2:
The system allows adjustment of multiple parameters (varus-valgus angle, flexion-extension angle) to achieve optimal positioning stability for each patient's unique anatomy, reducing the need for invasive fixation methods
3Measurement precision
If the mechanical axis does not line up with the anatomic axis, then accurate bone cut positioning becomes difficult, but traditional methods require invasive intramedullary intervention
Solution Approach 1:
The positioning member includes varus-valgus adjustment and flexion-extension adjustment mechanisms that enable dynamic adaptation to the mismatch between mechanical and anatomic axes, achieving accurate bone cut positioning through extramedullary means without complex intramedullary procedures
Solution Approach 2:
The positioning system integrates multiple functions (varus-valgus adjustment, flexion-extension adjustment, guide member positioning) into a single extramedullary device, providing comprehensive alignment capability that simplifies the surgical procedure while maintaining accuracy
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 system provides accurate extramedullary alignment, reduces the risk of infection and systemic embolism, and offers a less invasive approach, ensuring a secure fit for prosthetics and minimizing bone resection, while allowing for procedures in extension and accommodating extra-articular deformities.
Implementation Method 1
the light emitter mounting member configured to receive the light emitter with a magnetic interface
Implementation Method 2
the guide member configured to extend from the depth selector slide, the depth selector slide configured to be received within the channel of the positioning assembly. In an example, a magnetic interface can be formed between the channel and the depth selector slide
Data Source
AI summary
A bone cut positioning system and associated method are disclosed. The bone cut positioning system can include a positioning assembly, including a femoral attachment member, including a tongue with at least one fixation aperture configured to be fixed to a distal end of a femur. The positioning assembly can further include a light emitter mounting member configured to receive a light emitter, a channel configured to receive a depth selector slide, and a varus-valgus adjustment member configured to adjust a position of the positioning assembly relative to the femur to achieve a desired varus-valgus angle. A flexion-extension adjustment member can be configured to adjust a flexion-extension position of the positioning assembly relative to a flexion-extension of a knee joint and a guide member can be configured to extend from the depth selector slide.