Bone Plate Strain Ratio Normalization for Healing Assessment
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Solution Overview
Problem
Current methods for assessing bone healing through implant strain values require a known load applied to the bone, making it difficult to accurately track progress without normalization for varying loads.
Innovation Solution
A system with first and second sensors mounted on a bone plate, where the first sensor measures strain at a fracture site and the second sensor measures strain on a healthy portion of the bone, allowing for a ratio calculation that normalizes load effects and indicates healing progress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If implant strain values are used to assess bone healing, then bone healing progress can be tracked, but the assessment requires a known load applied to the bone which varies and complicates evaluation
Solution Approach 1:
The patent introduces a second sensor as an intermediary reference element that measures strain in a location unaffected by bone healing (such as on the implant away from the fracture site or on adjacent healthy bone). This intermediary sensor provides a reference measurement that mediates between the varying load conditions and the healing assessment, allowing normalization of the first sensor's readings to account for load variations.
Solution Approach 2:
The patent transforms the assessment approach by changing from using absolute strain values to using a ratio of strain values (first sensor reading divided by second sensor reading). This parameter transformation normalizes the measurements, eliminating the dependency on known load conditions while preserving the healing progress information.
2Device complexity
If a single sensor measures strain on the implant, then the device is simple, but it cannot distinguish between load effects and healing effects
Solution Approach 1:
The patent segments the measurement function by placing two separate sensors at different locations: one sensor on the implant at the fracture site to measure strain affected by both load and healing, and another sensor at a reference location to measure strain affected only by load. This segmentation allows the system to separate and independently measure the different contributing factors.
Solution Approach 2:
The second sensor serves multiple functions: it acts as a reference for normalization, provides load information, and enables the calculation of a healing-specific metric. This multi-functional use of the second sensor allows the system to achieve precise healing assessment without adding excessive complexity.
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
Enables accurate tracking of bone healing progress by isolating load effects, with the strain ratio trending downward as healing occurs, while lack of healing shows no recognizable trend over time.
Implementation Method 1
a first sensor mounted on the first portion measuring strain on the first portion
Implementation Method 2
a second sensor mounted on the second portion measuring strain on the second portion
Data Source
AI summary
A device and method for treating a hone includes a bone plate including first and second portions joined to one another via a connecting portion, a rigidity of the connecting portion being less than rigidities of each of the first and second portions in combination with a first sensor mounted on the first portion measuring strain on the first portion and a second sensor mounted on the second portion measuring strain on the second portion.