Deformable LCR Pressure Sensors for Collapsible Aortic Valves
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing passive LCR sensors are incompatible with collapsible artificial aortic valves due to the large deformation they undergo during implantation, which limits their ability to measure blood pressure effectively.
Innovation Solution
A wireless, LCR-based, passive sensor system with deformable coils and capacitive pressure sensors that switch between expanded and crimped states, allowing for blood pressure measurement at multiple locations using self-resonant frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If typical passive LCR sensors are used, then the sensor structure is simple and manufacturing is easy, but the sensor cannot tolerate large deformation during valve collapse and re-expansion
Solution Approach 1:
The sensor system employs dynamic elements including a deformable coil that can withstand large deformations during valve collapse and re-expansion, flexible printed circuit boards that flex with the valve motion, and movable contacts that maintain electrical connection throughout the deformation cycle. These dynamic components replace rigid traditional LCR sensor structures, enabling the sensor to reliably measure blood pressure while accommodating the extreme mechanical environment of collapsible valve operation.
2Adaptability or versatility
If passive LCR sensors are used, then no battery is needed and energy consumption is low, but the sensors are incompatible with the large deformation of collapsible valves
Solution Approach 1:
The sensor system utilizes flexible printed circuit boards as the substrate for mounting LCR components, allowing the entire sensor assembly to flex and deform with the collapsible valve during collapse and re-expansion. The flexible circuit board maintains electrical connections between components throughout the deformation cycle, enabling the passive LCR sensor to function reliably in the dynamic mechanical environment without requiring battery power.
3Measurement precision
If traditional sensors are used in collapsible valves, then the valve structure can be simple, but the sensors cannot measure blood pressure accurately during collapse and re-expansion
Solution Approach 1:
The sensor system is segmented into distinct functional components: a deformable coil for inductance measurement, capacitive pressure sensors for direct pressure detection, flexible printed circuit boards for electrical connections, and movable contacts for maintaining circuit integrity during deformation. This segmentation allows each component to be optimized for its specific function while collectively enabling accurate blood pressure measurement throughout the valve collapse and re-expansion cycle.
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 non-invasive, battery-free monitoring of blood pressure in collapsible artificial valves by calculating pressures at different points, facilitating timely detection of valve status and potential issues.
Implementation Method 1
the capacitive pressure sensor and the deformable coil collectively form an LCR circuit having a self-resonant frequency configured to change based on a blood pressure of the mammal subject
Implementation Method 2
a capacitive pressure sensor disposed in the artificial aortic valve, wherein the capacitive pressure sensor comprises a plurality of sensor electrodes electrically connected to the deformable coil in parallel to form a capacitor
Implementation Method 3
The antennas are respectively disposed on a skin of the mammal subject and wirelessly in communication with the deformation coils of the first and second sensor systems correspondingly, wherein the antennas is configured to measure the self-resonant frequencies of the LCR circuits
Data Source
AI summary
Provided are systems and methods for wireless, LCR-based, passive sensor systems for catheter or other implantable deployment using collapsible electromechanics. Each sensor system includes a deformable coil and a capacitive pressure sensor, collectively forming a LCR circuit having a self-resonant frequency. Multiple sensor systems may be implanted in a collapsible artificial valve to non-invasively detect the status of the collapsible artificial valve. Specifically, when the collapsible artificial valve is implanted in a mammal subject, antennas may be disposed on the skin of the mammal subject to wirelessly measure the self-resonant frequencies of the LCR circuits of the sensor systems. Thus, the blood pressure of the mammal subject may be calculated based on the self-resonant frequencies measured by the antenna, and the status of the collapsible artificial valve may be determined based on the blood pressure.