Hip Arthroplasty Guide Device for Accurate Length and Offset Assessment
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Solution Overview
Problem
Current measurement techniques for determining the length and offset of the hip during total hip arthroplasty are time-consuming, inaccurate, and pose a risk of injury due to the need for inserting a metal pin into the pelvis.
Innovation Solution
A guide device with an overlay portion and alignment portion, featuring contact surfaces that create reference points on the femur to accurately position a replacement femoral head in the same relative position as the original, reducing the need for invasive pin insertion and improving measurement precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a metal pin is inserted into the pelvis to measure hip length and offset, then measurement capability is achieved, but risk of injury and device complexity increase
Solution Approach 1:
The invention extracts the measurement function from the invasive pin insertion method. Instead of inserting a pin into the pelvis, the device uses external contact surfaces that engage with the femur and pelvis from the outside, eliminating the harmful invasive procedure while preserving the measurement capability through geometric reference points
Solution Approach 2:
The guide device acts as an intermediary between the surgeon and the patient's anatomy. Rather than directly inserting measurement pins into bone, the device uses contact surfaces that interface with the femur and pelvis externally, transferring measurement information without direct invasive penetration
2Measurement precision
If a metal pin is inserted into the pelvis for measurement, then reference points can be established, but the procedure becomes time-consuming and complex
Solution Approach 1:
The guide device is pre-configured with contact surfaces and geometric relationships established before surgery. The alignment portion's contact surfaces are designed to naturally engage with predetermined locations on the femur and pelvis, eliminating the need for time-consuming intraoperative measurements and calculations
Solution Approach 2:
The device creates a simplified geometric copy of the anatomical relationships. Instead of complex direct measurements, the contact surfaces replicate the spatial relationships between femur and pelvis reference points, allowing quick transfer of measurement information through the guide device's geometry
3Productivity
If contact surfaces are used to create reference points on the femur, then measurement speed increases, but alignment precision requirements increase
Solution Approach 1:
The contact surfaces are designed with specific local geometric properties that facilitate precise alignment. Each contact surface has a unique shape and orientation that corresponds to a specific anatomical location, ensuring that when the surfaces engage with the bone, automatic alignment occurs without requiring high precision from the surgeon's placement
Data Source
AI summary
A guide device for assessing the length and offset of a hip of a patient is disclosed. The guide device includes an overlay portion and an alignment portion. The overlay portion is configured to enable assessment of the relative location of the guide device to the original femoral head of a patient using a marking on the overlay portion. Reference points for positioning the guide device are created on the femur. When the guide device is positioned at the reference points it can be used to position a replacement femoral head in the same position as the patient's original femoral head by aligning the replacement femoral head with the marking on the overlay portion.