Acetabular Angle Positioning With Spherical Scales in Hip Arthroplasty
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Solution Overview
Problem
Current methods for determining the acetabular angle in total hip arthroplasty lack a professional measuring tool, leading to subjective and inaccurate angle determination, which can result in errors and increased need for revision surgeries.
Innovation Solution
An acetabular prosthesis angle positioning device comprising a telescopic tripod, spherical scale instrument, and Kirschner wire for precise acetabular angle measurement, utilizing CT imaging data to adjust and fix the operating rods for accurate acetabular rasp grinding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If visual inspection or empirical determination is used to determine acetabular angle, then the surgical process is simple and quick, but the measurement precision and reliability are poor leading to errors in abduction angle and anteversion angle
Solution Approach 1:
The patent employs a spherical positioning structure with latitude and longitude lines that conform to the curved surface of the acetabulum. The spherical housing contains scale marks arranged in latitude and longitude patterns, allowing precise angular measurement along the curved pelvic surface. This spherical geometry naturally adapts to the anatomical curvature while providing accurate angle determination for both abduction and anteversion measurements.
Solution Approach 2:
The invention transitions from two-dimensional visual estimation to three-dimensional spatial positioning using a spherical coordinate system. The positioning device incorporates latitude lines for abduction angle measurement and longitude lines for anteversion angle measurement, adding a third dimensional aspect to angle determination. This multi-dimensional approach enables simultaneous measurement of multiple angular parameters with high precision.
2Reliability
If visual inspection or empirical determination is used to determine acetabular angle, then no specialized equipment is needed, but the reliability of prosthesis positioning is poor leading to loosening and need for revision surgery
Solution Approach 1:
The spherical positioning device incorporates scale marks and indicator mechanisms that provide real-time visual feedback on the positioned angles. The device allows surgeons to read the abduction and anteversion angles directly from the spherical scales, enabling immediate verification and adjustment of prosthesis positioning. This feedback mechanism ensures accurate and reliable positioning while reducing dependence on surgeon experience alone.
Solution Approach 2:
The invention replaces the subjective mechanical judgment of visual inspection with an objective mechanical measurement system. The spherical device with its calibrated latitude and longitude lines provides quantifiable angular measurements, substituting empirical estimation with precise mechanical indication. This objective measurement system significantly improves positioning reliability and reduces variability between different surgeons.
3Manufacturing precision
If accurate angle measurement tools are introduced, then measurement precision and prosthesis positioning accuracy improve, but the device complexity and surgical procedure complexity increase
Solution Approach 1:
The spherical positioning device serves multiple functions within a single integrated structure. It simultaneously measures both abduction angles (via latitude lines) and anteversion angles (via longitude lines), provides angular measurement and physical positioning guidance, and works for different prosthesis types. This multi-functionality reduces the need for multiple separate tools while maintaining high measurement precision.
Solution Approach 2:
The positioning device is divided into functional segments including the spherical housing with scales, the positioning rods, the fixing mechanisms, and the indicator components. Each segment performs a specific function but they work together as an integrated system. The spherical surface is segmented into latitude and longitude zones for different angle measurements, allowing complex measurement tasks to be broken down into manageable visual readings.
Data Source
AI summary
Disclosed in the present disclosure are an acetabular prosthesis angle positioning device for total hip arthroplasty. The device includes a telescopic tripod, a spherical scale instrument, a first fixing member, a main operating rod, a connecting device and an auxiliary operating rod. The spherical scale instrument includes a transparent spherical housing and a connecting ball clamped in the transparent housing, scale marks are arranged on the transparent spherical housing, and mark points fitted to the scale marks are arranged on the connecting ball; the main operating rod is connected to the connecting ball; and the main operating rod is connected to the auxiliary operating rod through the connecting device, and the auxiliary operating rod is hollow.