CSF Shunt Flow Enhancer Using Acoustic Vibration
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Solution Overview
Problem
Current methods for diagnosing cerebrospinal fluid (CSF) shunt obstruction in hydrocephalus patients are invasive, unreliable, and often lead to delayed or misdiagnosis, resulting in high mortality rates due to the inability to accurately detect flow rates and differentiate between patent and occluded shunts.
Innovation Solution
A non-invasive device and method using a micro-pumper and CSF ESPA system that applies vibrations to the shunt valve to generate pressure and flow, combined with thermal convection technology to detect temperature changes and assess shunt patency, allowing for rapid and accurate detection of flow rates and occlusion levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If invasive methods such as shunt tap or CT scan are used to diagnose shunt obstruction, then diagnostic accuracy is improved, but patient safety deteriorates due to risks of infection, embolism, and radiation exposure
Solution Approach 1:
The patent replaces invasive mechanical diagnostic methods (shunt tap, CT scan) with a non-invasive acoustic vibration-based system. The micro-pumper generates controlled vibrations that propagate through the shunt system, and acoustic sensors detect these vibrations to assess shunt patency and flow characteristics without breaking skin or exposing patients to radiation.
Solution Approach 2:
The patent introduces acoustic waves as an intermediary medium to transmit information about shunt status. Instead of directly invading the shunt system or using radiation, the system uses acoustic vibrations as a mediator that can penetrate tissues and interact with the shunt mechanism, allowing indirect but safe assessment of shunt function.
2Reliability
If multiple CT scans are performed to detect ventricular enlargement, then diagnostic reliability is improved, but radiation exposure increases resulting in harmful effects for pediatric patients
Solution Approach 1:
The patent replaces radiation-based imaging (CT scans) with acoustic vibration-based detection. The system uses a micro-pumper to generate controlled acoustic waves that travel through the shunt system, and sensors detect these vibrations to assess shunt function and detect obstruction, eliminating the need for repeated radiation exposure.
Solution Approach 2:
The patent employs periodic acoustic vibrations generated by the micro-pumper to repeatedly assess shunt status over time. This allows monitoring of shunt function and detection of progressive obstruction without requiring repeated radiation exposure, as the acoustic method can be performed multiple times safely.
3Ease of operation
If manual pumping of the shunt reservoir is performed to evaluate shunt flow, then flow assessment is possible, but the method is unreliable and operator-dependent
Solution Approach 1:
The patent replaces manual mechanical pumping with an automated micro-pumper system. The micro-pumper uses precise mechanical actuation to generate controlled vibrations at the shunt valve, and acoustic sensors automatically detect and measure the resulting flow characteristics, eliminating operator variability and improving assessment reliability.
Solution Approach 2:
The patent enables the shunt system to self-assess its own function through the micro-pumper and sensor system. The system automatically generates vibrations, detects flow responses, and provides objective measurements of shunt patency and flow rate without requiring manual intervention or operator skill, making the assessment reliable and reproducible.
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 solution provides high sensitivity and specificity in detecting CSF flow and occlusion, reducing the need for invasive procedures and radiation exposure, enabling early diagnosis and reducing shunt revision surgeries by accurately differentiating between patent and occluded shunts.
Implementation Method 1
a vibrating (e.g., reciprocating, pulsating, etc.) member disposed within the housing that generates a vibrating force when activated
Implementation Method 2
the vibrating member generates pressure and flow of CSF within the CSF shunt when the vibrating member is placed against the skin and over the shunt valve
Implementation Method 3
combined with thermal convection technology to detect temperature changes and assess shunt patency
Data Source
AI summary
An apparatus capable of generating flow in cerebrospinal fluid (CSF) shunt systems by vibrating the shunt, tubing or shunt valve dome, or applying cyclical pressure to the various parts of the shunt system. A method of generating flow and method of using the apparatus in shunt patency assessment, for example, hydraulic resistance assessment, is also disclosed. The apparatus allows, in conjunction with a thermal dilution method or radionuclide method, a quick CSF shunt patency assessment based upon CSF shunt resistance and not upon CSF flow or intracranial pressure (ICP) separately. This provides a more objective measure of shunt obstruction compared to other methods. Furthermore, the apparatus can be used to enhance flow in shunts, identify partial occlusion before symptoms occur, differentiate between patent, partially-occluded and occluded shunts. The apparatus can be used to generate flow in shunts if there is a need to lower ICP or move drugs administered via an injection chamber or a shunt dome.