Expandable Coil Tank Circuit for Arterial Compliance Detection
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Solution Overview
Problem
Current methods for measuring arterial compliance, such as Pulse Wave Velocity and Doppler-Echocardiography, are invasive, time-consuming, and do not provide real-time compliance data, especially for specific locations like aneurysms.
Innovation Solution
A device comprising an expandable coil and a capacitor connected in series, which is positioned along a vessel wall to measure compliance by detecting changes in pressure-induced distension, allowing for wireless telemetric sensing of vessel compliance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If diagnostic angiogram is used to measure arterial compliance, then measurement precision is improved, but device complexity and invasiveness increase
Solution Approach 1:
The patent replaces the mechanical and optical diagnostic angiogram system with an electrical impedance-based sensing system. The implantable sensor uses electrical measurements to detect arterial compliance, eliminating the need for catheters and x-ray equipment while providing continuous monitoring capability.
Solution Approach 2:
The implantable sensor performs self-measurement of arterial compliance through electrical impedance sensing. The sensor automatically detects changes in arterial wall properties and transmits data wirelessly, eliminating the need for repeated invasive procedures by medical professionals.
2Device complexity
If PWV or Doppler-Echocardiography is used to estimate arterial compliance, then device complexity is reduced, but measurement precision and real-time capability are worsened
Solution Approach 1:
The patent replaces mechanical measurement methods (PWV using pressure catheters, Doppler-Echocardiography using ultrasound) with electrical impedance sensing. This substitution maintains simple device architecture while significantly improving measurement precision and enabling real-time continuous monitoring.
3Measurement precision
If diagnostic angiogram is performed repeatedly to monitor coiled aneurysms, then measurement precision is improved, but loss of time and patient burden increase
Solution Approach 1:
The sensor is implanted during the initial aneurysm coiling procedure, performing preliminary placement that enables continuous long-term monitoring. This eliminates the need for repeated diagnostic angiograms at 6, 12, and 24 months, as the implantable device provides ongoing surveillance of aneurysm status.
Solution Approach 2:
The implantable sensor provides continuous monitoring of arterial compliance and aneurysm status, replacing discrete, intermittent diagnostic angiogram procedures. This continuous action enables real-time detection of changes without requiring repeated patient procedures.
4Measurement precision
If invasive methods are used to measure arterial compliance, then measurement precision is improved, but ease of operation and patient comfort are worsened
Solution Approach 1:
The patent replaces invasive mechanical measurement systems with a minimally invasive electrical impedance sensing system. The implantable sensor requires only a small insertion procedure, eliminating the need for catheter navigation through arteries and x-ray exposure, while maintaining high measurement precision through electrical sensing.
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 device provides non-invasive, real-time measurement of arterial compliance, enabling effective monitoring of vessel health and potential aneurysm rupture risk, with the ability to detect pressure changes and structural changes in the vessel wall.
Implementation Method 1
the coil and the capacitor are connected in series forming a tank circuit... detecting changes in pressure-induced distension
Implementation Method 2
a capacitor, wherein the coil and the capacitor are connected in series forming a tank circuit
Implementation Method 3
the coil is expandable and positioned along a portion of the vessel so that when the portion of the vessel expands or contracts, the coil will also expand or contract
Data Source
AI summary
A device which provides a measure of the compliance of a vessel wall based on a change in pressure, which causes the vessel to distend. The device comprises a coil and capacitor, forming a tank circuit. The coil is expandable and positioned along a portion of the vessel so that when the portion of the vessel expands or contracts, the coil will also expand or contract, changing the area inside the coil. This change in area alters the coil inductance, and therefore the resonant frequency of the tank circuit, which can be detected externally.