Skin Flap Thickness Estimation for Implantable Medical Devices
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Solution Overview
Problem
Current medical devices, such as cochlear implants, face challenges in accurately estimating skin flap thickness, which affects the magnetic coupling between external and implantable components, impacting operational parameters like battery autonomy and signal strength.
Innovation Solution
A method is developed to estimate skin flap thickness using the strength of a magnet in the external component of an implantable medical device system, allowing for determination of operational parameters such as battery type suitability and signal attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If magnet strength is increased to improve coupling through thicker skin flaps, then magnetic coupling strength is improved, but device complexity increases due to need for multiple magnet strength options
Solution Approach 1:
The patent applies parameter changes by varying the magnetic strength of the magnet based on the skin flap thickness. Different magnet strengths (e.g., 1M, 2M, 3M, 4M, 5M, 6M) are selected to match different skin flap thickness ranges, optimizing the magnetic coupling strength for each specific case without requiring a complex adjustable mechanism.
Solution Approach 2:
The patent implements preliminary action by pre-determining the appropriate magnet strength based on estimated skin flap thickness before final device assembly. The system estimates skin flap thickness using imaging or measurement techniques, selects the appropriate magnet strength in advance, and incorporates it into the external component, avoiding the need for complex post-assembly adjustments.
2Measurement precision
If skin flap thickness is not accurately estimated, then operational parameters cannot be optimized, but implementing complex estimation methods increases device complexity
Solution Approach 1:
The patent uses an intermediary approach by employing imaging systems (such as ultrasound or MRI) to estimate skin flap thickness indirectly. Rather than requiring direct complex measurements during device assembly, the system uses available medical imaging data or simple external measurements to infer skin flap thickness, which then guides the selection of operational parameters and magnet strength.
Solution Approach 2:
The system performs skin flap thickness estimation in advance using pre-existing imaging data or simple measurements taken during the surgical planning phase. This preliminary estimation allows for optimal device configuration before implantation, avoiding the need for complex real-time measurement systems during device assembly.
3Use of energy by moving object
If magnet strength is mismatched to skin flap thickness, then power consumption increases due to inefficient coupling, but adjusting magnet strength requires multiple component variants
Solution Approach 1:
The patent optimizes power consumption by changing the magnet strength parameter to match the skin flap thickness. Properly matched magnet strength ensures efficient magnetic coupling between the external and implantable components, maximizing power transfer efficiency and minimizing energy loss. This parameter matching approach avoids the need for complex active power management systems.
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
This approach enables precise adjustment of operational parameters based on estimated skin flap thickness, improving the performance and comfort of implantable medical devices by optimizing magnetic coupling and power efficiency.
Implementation Method 1
a magnet being configured to magnetically couple the external component to an implantable component of the implantable medical device system through a skin flap
Data Source
AI summary
Presented herein are techniques for estimating skin flap thickness (“SFT”) of a recipient of an implantable medical device system. In particular, in accordance with the techniques presented herein, the implantable medical device comprises an external component having a magnet configured to magnetically couple the external component to an implantable component of the implantable medical device system through a skin flap of a recipient of the implantable medical device system. The SFT is estimated based on a strength of the magnet. One or more operational parameters for the implantable medical device system may be determined and/or set based on the estimated SFT.