Implantable Flow Sensor Capsule for Impedance Isolation
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Solution Overview
Problem
Conventional cardiac electrotherapy systems face limitations in chronic applications due to tissue growth and body fluid penetration, which affect signal transmission and processing, leading to reduced accuracy in flow measurement and pacing control.
Innovation Solution
The system incorporates a lead with a capsule that houses the flow measurement sensor and electrical circuitry, including a tunable charge amplifier, to minimize the impact of impedance variations and tissue overgrowth, with the circuitry positioned closer to the sensor to reduce signal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the flow measurement sensor and electrical circuitry are positioned on the lead, then the system can measure blood flow velocity, but tissue growth and body fluid penetration cause impedance variations that reduce measurement accuracy in chronic applications
Solution Approach 1:
The system is divided into separate functional modules: the flow measurement sensor remains on the lead while the electrical circuitry is relocated to a capsule positioned away from the lead. This segmentation isolates the sensor from the harmful effects of tissue growth and body fluid penetration, maintaining measurement accuracy over time.
Solution Approach 2:
The capsule acts as an intermediary structure that houses the electrical circuitry and provides a stable interface between the lead and the external device. This intermediary isolates the circuitry from direct contact with tissue and body fluids, reducing impedance variations and improving signal transmission reliability.
2Loss of information
If the electrical circuitry is positioned closer to the sensor, then signal interference is reduced, but the device complexity increases due to the capsule structure
Solution Approach 1:
The capsule combines multiple functions into a single integrated structure: it houses the electrical circuitry, provides mechanical support, and serves as an interface between the lead and external device. This merging reduces the number of separate components and simplifies the overall system despite the added structural element.
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 configuration enhances the accuracy and reliability of flow measurement and pacing control in both acute and chronic applications by reducing the adverse effects of tissue and fluid on signal transmission and processing.
Implementation Method 1
The system incorporates a lead with a capsule that houses the flow measurement sensor and electrical circuitry, including a tunable charge amplifier
Data Source
AI summary
An implantable medical device lead having a flow measurement sensor mounted thereon is provided with a capsule mounted proximate to the sensor. The capsule is used to house electrical circuitry corresponding to the sensor in order to prevent impedance on conductors of the lead, which gradually decreases over chronic periods, from directly affecting signal transmission between the sensor and the electrical circuitry. The electrical circuitry includes a charge amplifier used for processing signals from the sensor. In some cases, the amplifier can be initially calibrated and periodically tuned so as to have consistent functioning with the sensor over chronic periods.