Conformable Thermosensor Pad for CSF Shunt Flow Evaluation
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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 CSF flow rates non-invasively and efficiently.
Innovation Solution
A disposable sensor pad with multiple temperature sensors and a processing device that uses thermal dilution technology to detect CSF flow through subcutaneous shunts by analyzing temperature changes caused by a cold source, providing a non-invasive and reliable method for assessing flow rates and status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If invasive procedures (shunt tap, physical examination) are used to diagnose shunt obstruction, then diagnostic information can be obtained, but patient safety deteriorates due to infection risk, pain, and potential complications
Solution Approach 1:
The patent replaces invasive mechanical procedures (shunt tap, physical examination) with a non-invasive thermal sensing system. Temperature sensors detect CSF flow by measuring temperature changes in the shunt catheter, eliminating the need for physical penetration of the shunt system and thereby removing infection risks and patient pain while maintaining diagnostic capability
Solution Approach 2:
The patent introduces temperature as an intermediary parameter to indirectly measure CSF flow. Instead of directly sampling CSF or mechanically examining the shunt, the system uses temperature sensors to detect thermal changes caused by CSF movement, providing a safe indirect measurement method that preserves patient safety while achieving diagnostic accuracy
2Measurement precision
If repeated CT and MR imaging are performed to detect ventricular enlargement, then shunt malfunction can be detected, but patient safety deteriorates due to repeated radiological exposures
Solution Approach 1:
The patent replaces radiological imaging methods (CT, MR) with a thermal sensing system that uses temperature measurements to detect CSF flow dynamics. This substitution eliminates ionizing radiation exposure while providing continuous or frequent monitoring capability to detect ventricular enlargement and shunt malfunction without the harmful effects of repeated radiological imaging
3Object-affected harmful factors
If non-invasive thermal dilution method is used to detect CSF flow, then patient safety is improved by eliminating invasive procedures, but measurement precision deteriorates due to difficulty in accurately detecting flow rates
Solution Approach 1:
The patent divides the thermal sensing measurement into multiple segments: control sensors measure ambient temperature changes, while test sensors measure temperature changes specifically in the shunt catheter. By segmenting the measurement and comparing differential temperatures, the system achieves accurate flow rate detection from non-invasive thermal data, overcoming the precision limitations of simple thermal dilution methods
Solution Approach 2:
The system uses feedback by continuously monitoring temperature differences and comparing them against flow rate thresholds. The differential temperature measurement provides real-time feedback on CSF flow status, enabling accurate detection of flow rate changes and shunt patency while maintaining non-invasive safety
4Device complexity
If standard thermosensors are used for thermal dilution testing, then device simplicity is maintained, but measurement precision deteriorates due to limited dynamic range and inability to detect low flow rates
Solution Approach 1:
The patent applies local quality by positioning temperature sensors at specific locations along the shunt catheter and using differential measurement between control and test sensors. This localized strategic placement and differential approach extends the effective dynamic range of the sensing system, enabling detection of both low and high flow rates while maintaining relative system simplicity
Solution Approach 2:
The patent extends the measurement capability into another dimension by using multiple temperature sensors at different positions along the shunt catheter. This spatial dimensionality allows the system to detect temperature gradients and extend the dynamic range of flow rate detection beyond what a single sensor could achieve, while adding minimal complexity to the overall system
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 enables rapid, accurate, and non-invasive detection of CSF flow rates, reducing the need for invasive procedures and repeated radiological exposures, thereby improving diagnostic confidence and patient safety.
Implementation Method 1
uses thermal dilution technology to detect CSF flow through subcutaneous shunts by analyzing temperature changes caused by a cold source
Data Source
AI summary
An apparatus and method that utilizes thermal dilution to detect a wide range of flow rates and/or flow status in cerebrospinal fluid (CSF) shunt systems. The use of a large cold source in combination with thermosensor pad of a particular construction provide a fluid flow analyzer with the ability to detect very low levels of CSF flow. In addition, a method for adjusting thermal dilution readings to compensate for varying shunt catheter depth is shown and for determining a steady state of the thermal dilution readings. The thermosensor pad is conformable to a patient's skin contour thereby making the apparatus and method less sensitive to ambient temperature errors and, as a result, more accurate in assessing CSF flow. Furthermore, a software error check is provided for identifying poor sensor-to-skin contact for alerting an operator to re-apply the thermosensor pad to correct, as well as a post-test check to determine if temperature data is reasonable before determining flow status or flow rate.