Arthroscopic Unicompartmental Knee Implant Alignment
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Solution Overview
Problem
Current partial knee replacement surgeries face challenges in achieving precise alignment and efficient preparation of the femur and tibia for unicompartmental implants, leading to suboptimal alignment and longer recovery times.
Innovation Solution
The use of a dual-sided rotary drill cutter for retrograde tibial socket creation and femoral cuts through flexion/extension motions, enabling automatic alignment of femoral and tibial components and arthroscopic preparation of both bones to accept a unicompartmental implant covering the entire contact area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional partial knee replacement surgery is performed with separate preparation of femur and tibia, then the procedure can be completed, but alignment precision is reduced and surgery time increases
Solution Approach 1:
The patent combines the separate femoral and tibial preparation procedures into a single integrated process. A single guide is used to establish both the tibial socket orientation and the femoral cut alignment, and a single instrument performs both preparation steps sequentially. This merging of previously separate operations achieves automatic alignment of both components while reducing the total time required for surgery.
Solution Approach 2:
The surgical guide and preparation system are designed to be self-aligning through the use of anatomical landmarks and fixed geometric relationships. The guide automatically establishes the correct alignment based on the patient's own anatomy, eliminating the need for separate alignment measurements and adjustments. The system uses the patient's bone structure itself to define the alignment, making the procedure self-servicing rather than requiring external alignment tools.
2Ease of operation
If traditional knee replacement instruments are used, then the procedure follows established methods, but the incision size is larger and recovery is slower
Solution Approach 1:
The patent divides the knee replacement procedure into distinct arthroscopic portals and preparation steps. The surgical guide is inserted through a small anterior incision, while the tibial socket is prepared through a separate retrograde approach. This segmentation allows each component to be accessed through minimally invasive routes, reducing overall incision size while maintaining procedural control through structured, step-by-step execution.
3Manufacturing precision
If precise alignment is achieved through multiple separate steps, then alignment accuracy improves, but the number of surgical steps increases
Solution Approach 1:
The patent merges multiple alignment-determining steps into a single guide insertion and setup procedure. The guide simultaneously establishes the tibial socket orientation, the femoral cut alignment, and the relationship between them, all through one positioning action. This eliminates the need for separate alignment measurements, trial fittings, and adjustments that would otherwise be required.
Solution Approach 2:
The surgical guide acts as an intermediary device that translates anatomical landmarks into precise alignment. Rather than requiring multiple direct measurements and adjustments between the surgeon and the bone surfaces, the guide serves as a mediator that automatically establishes all necessary alignments based on its positioning relative to anatomical references. This intermediary device simplifies the procedure while maintaining high precision.
Data Source
AI summary
A two sided cylindrical chondral resurfacing implant that covers areas of the highest contact between the tibia and femur. A dual-sided rotary drill cutter is employed to create a tibial socket from outside in. A full femoral trough is made with the opposite side of the rotary drill cutter by simply moving the knee through flexion and extension. In this manner, automatic alignment of femoral and tibial components is achieved due to the “transtibial” nature of the femoral preparation.