Graded Radiopacity Calibration Tool for Spinal Fusion Implants
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Solution Overview
Problem
Current methods for assessing spinal fusion and bone healing are limited by inaccuracies in interpreting radiographic images due to variations in X-ray parameters and tissue thickness, leading to inconsistent assessments of bone maturity and fusion status.
Innovation Solution
An implant device with an integrated graded radiopacity calibration tool that provides a range of bone density parameters, allowing for accurate calibration and quantification of bone mineral density through radiographic imaging, thereby standardizing fusion assessment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional radiographic imaging is used to assess spinal fusion, then the assessment process is simple and quick, but the measurement precision is poor due to variations in X-ray parameters and tissue thickness
Solution Approach 1:
A calibration tool with known radiopacity values is introduced as an intermediary object between the X-ray source and the bone tissue. This calibration tool includes multiple regions with different radiopacity levels that serve as reference standards, allowing the imaging system to compensate for variations in X-ray parameters and tissue thickness without requiring complex equipment modifications
Solution Approach 2:
The calibration tool incorporates regions with systematically varied radiopacity parameters (different material compositions and thicknesses) to create a reference scale. By changing the radiopacity parameter across different regions of the calibration tool, the system establishes a quantitative relationship between image intensity and actual bone density, enabling precise measurements despite variations in imaging conditions
2Reliability
If manual interpretation of radiographic images is used, then the device complexity is low, but the reliability is poor due to subjectivity and inconsistency in fusion status assessment
Solution Approach 1:
The calibration tool provides built-in feedback reference standards within the same radiographic image. By comparing the actual bone density regions against the known radiopacity values of the calibration tool regions visible in the same image, the assessment process becomes objective and quantifiable, eliminating subjective interpretation while maintaining a relatively simple system architecture
3Measurement precision
If contact radiographs with external calibration wedges are used, then the measurement precision can be improved, but the ease of operation deteriorates due to difficulty in proper image adjustment and calibration
Solution Approach 1:
The calibration tool is merged with the implant device itself, integrating the calibration reference standards directly into the spinal fusion implant. This combination eliminates the need for separate external calibration wedges and simplifies the操作流程 by having both the therapeutic implant and the measurement reference in a single integrated component that is already present in the patient's body
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
The implant device enables precise and standardized assessment of bone maturity and fusion status, facilitating better comparison across treatments and patient populations, and allowing for quantitative tracking of healing progression.
Implementation Method 1
a first portion of the appendage has a first density that absorbs a first amount of ionizing radiation to provide a first gray level in an image captured by ionizing radiation
Data Source
AI summary
An implant device for use in achieving spinal fusion, includes an implant having an implant body. The device includes a graded radiopacity calibration tool integrated with the implant body. The tool has a plurality of graded levels of radiopacity representative of a range of bone density parameter amounts. Each of the graded levels corresponds to a different bone density parameter amount. A method is provided that uses the device to determine a degree of one of bone maturity, strength, osteoporotic state, state of healing and state of degrading bone tissue based on a comparison of a bone at the site in the image and radiopacity correlated from a calibration standardized curve defined by the standard, with a range of grey levels representative of degrees of one of the bone maturity, the strength, the osteoporotic state, the state of healing and the state of degrading bone tissue.