Surgical Guide Section for Accurate Hip Center Alignment
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Solution Overview
Problem
In artificial knee joint replacement surgery, accurately aligning the knee joint center is challenging due to the inability to visually confirm the hip joint center, leading to potential misalignment and reduced measurement accuracy.
Innovation Solution
A measuring instrument with a guide section that indicates the position of the femoral head center using preliminarily measured relative positions, allowing for accurate alignment by referencing visible markers and anatomical landmarks such as the iliac spine, and utilizing laser beams or metal bars to accurately position the guide section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a metal bar is used to check alignment by passing through the hip joint center, knee joint center, and foot joint center, then alignment measurement can be performed, but the hip joint center cannot be visually confirmed during surgery leading to misalignment
Solution Approach 1:
The patent introduces a guide section as an intermediary device that indirectly indicates the hip joint center position. Since the hip joint center cannot be directly observed, the guide section serves as a mediator that translates pre-measured relative position data into a visible indication during surgery, allowing the surgeon to align the metal bar correctly without directly seeing the hip joint center.
Solution Approach 2:
The patent applies preliminary action by measuring and recording the relative position between the reference area (visible during surgery) and the hip joint center before the actual alignment measurement. This pre-measured data is stored in the guide section, enabling accurate indication during surgery without requiring direct visualization of the hip joint center at that moment.
2Productivity
If the surgeon estimates the hip joint center position visually, then the procedure can continue, but misalignment occurs reducing measurement accuracy
Solution Approach 1:
The guide section provides feedback by visually indicating the correct hip joint center position based on pre-measured data. This feedback mechanism allows the surgeon to verify whether the estimated position is correct, enabling continuous procedure flow while eliminating the inaccuracy of pure visual estimation.
3Measurement precision
If a guide section indicating the femoral head center is introduced, then alignment accuracy is improved, but device complexity increases
Solution Approach 1:
The guide section creates a copy or representation of the hip joint center position relationship relative to the reference area. Instead of requiring direct access to or complex measurement of the three-dimensional hip joint center, the guide section reproduces the essential positional relationship using pre-measured data, simplifying the overall device structure while maintaining measurement accuracy.
Data Source
AI summary
Provided is a measuring instrument for use in artificial knee joint replacement surgery that can perform knee joint alignment measurement more accurately. A measuring instrument for use in artificial knee joint replacement surgery includes a guide section. The guide section is used to indicate, from the outside of a patient, the position of a femoral head center of a hip joint of the patient. The guide section indicates the position of the femoral head center while being arranged based on preliminarily measured relative positions of an anterior superior iliac spine and the femoral head center of the patient. The anterior superior iliac spine is viewable from the outside of the patient.