Wireless ICP Implant With Drift-Compensated Pressure Sensing
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Solution Overview
Problem
Conventional methods for measuring intracranial pressure (ICP) are inaccurate due to neglecting factors like head temperature and barometric pressure, susceptible to noise and measurement drift, and are overly invasive and uncomfortable for patients.
Innovation Solution
An implantable system with a pressure conduction catheter and sensors, including a pressure-sensing diaphragm and wireless data transmission, which measures ICP and temperature, and compensates for environmental factors, providing accurate and less invasive monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional fluid column methods are used to measure ICP, then the measurement can be obtained, but the measurement accuracy deteriorates due to neglecting factors like head temperature and barometric pressure
Solution Approach 1:
The system changes the measurement parameters by incorporating temperature sensors and barometric pressure sensors alongside the pressure sensor. This allows the system to account for temperature and atmospheric pressure variations when measuring ICP, thereby improving measurement accuracy and reliability by compensating for environmental factors that would otherwise cause erroneous readings.
Solution Approach 2:
The system implements feedback mechanisms by continuously monitoring temperature and barometric pressure, then using this information to adjust and compensate for their effects on the ICP measurement. The processor uses feedback from these additional sensors to correct the pressure readings, ensuring accurate ICP measurement despite changing environmental conditions.
2Measurement precision
If conventional fluid column methods are used, then ICP can be measured, but the system becomes susceptible to noise and measurement drift
Solution Approach 1:
The system replaces the conventional mechanical fluid column method with an electronic sensing system using piezoresistive or capacitive pressure sensors. This substitution eliminates the mechanical limitations of fluid columns, reducing noise and measurement drift while improving the stability and reliability of ICP measurements through electronic signal processing.
Solution Approach 2:
The system introduces intermediary sensors (temperature sensor, barometric pressure sensor) that mediate the measurement process by providing corrective data. These intermediary measurements allow the system to compensate for environmental variations and systematic errors, thereby reducing noise and drift in the final ICP reading.
3Measurement precision
If conventional catheter methods are used, then ICP measurement is possible, but the invasiveness and patient discomfort increase
Solution Approach 1:
The implantable device performs multiple functions within a single integrated unit: it measures ICP, temperature, and barometric pressure, and communicates this data wirelessly. This multi-functionality reduces the need for multiple separate invasive procedures and allows for continuous monitoring without repeated catheter insertions, thereby reducing patient discomfort while maintaining measurement capability.
Solution Approach 2:
The system enables self-service monitoring by wirelessly transmitting data to an external receiver, eliminating the need for manual reading of pressure transducers or fluid columns. The automated wireless communication system reduces the burden on both patient and caregiver, improving comfort while maintaining continuous accurate monitoring.
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 system offers more accurate, less invasive, and stable ICP measurements with improved drift stability, versatility in monitoring locations, and compatibility with MRI, enabling ease of configuration and integration with external systems.
Implementation Method 1
The sensors can include optical sensors, strain gauges, capacitive sensors, Hall Effect sensors, and the like, and can measure stress and/or strain and/or deflection of the pressure-sensing diaphragm
Implementation Method 2
The implant can communicate with a transceiver, which can receive data (e.g., measurements) from the implant
Implementation Method 3
Temperature sensors can be configured to measure the temperatures of the implant and/or implant environment
Data Source
AI summary
Some embodiments of the present disclosure comprise improved systems and methods for monitoring physiological parameters such as intracranial pressure (“ICP”), intracranial temperature, and subject head position. For example, in some embodiments, an implantable apparatus for measuring ICP can be implanted into a subject skull. The apparatus can comprise an implant body having a hermetically sealed chamber housing a gas at a reference pressure, and a pressure conduction catheter having a proximal end and a distal end, wherein the distal end is configured to extend into the brain through a burr hole in the skull and includes a plurality of ports. A barrier can cover the ports of the distal end of the pressure conduction catheter, wherein the barrier and pressure conduction catheter are filled with a number of gas molecules so that the barrier is not in tension in a predefined range of ICPs.