Wireless Intracranial Pressure Sensor for Hydrocephalus Shunts
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Solution Overview
Problem
Current methods for diagnosing hydrocephalus shunt failures are invasive, risking infection and requiring physical access, which is not suitable for long-term monitoring and has high failure rates due to obstruction issues.
Innovation Solution
A biocompatible, wireless pressure sensor is integrated into hydrocephalus shunts, powered by RF energy, with an oil chamber for protection against biofouling, allowing noninvasive monitoring of intracranial pressure and compatible with MRI scanners, enabling remote data transmission and calibration using atmospheric pressure measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If invasive methods are used to diagnose shunt failure, then diagnostic accuracy is improved, but risk of infection increases
Solution Approach 1:
The patent replaces invasive mechanical diagnostic procedures with a wireless electronic pressure sensor system. The sensor continuously monitors intracranial pressure wirelessly, eliminating the need for needle punctures or surgical access while providing accurate pressure measurements for diagnosing shunt failure.
Solution Approach 2:
The patent introduces a wireless pressure sensor as an intermediary device that indirectly measures intracranial pressure without direct invasive contact. The sensor transmits pressure data wirelessly to external devices, serving as a mediator between the internal physiological state and external diagnosis, thereby avoiding infection risk while maintaining diagnostic accuracy.
2Measurement precision
If physical access is required for pressure measurement, then measurement accuracy is improved, but procedural complexity increases
Solution Approach 1:
The patent implements a self-service measurement system where the wireless pressure sensor automatically and continuously monitors intracranial pressure without requiring periodic manual intervention. The sensor performs measurements autonomously and transmits data wirelessly, eliminating the need for repeated invasive procedures while maintaining accurate pressure monitoring.
Solution Approach 2:
The patent replaces complex invasive measurement procedures with a simplified wireless electronic system. The electronic sensor automatically measures pressure and transmits data without requiring physical access, thereby reducing procedural complexity while maintaining measurement accuracy.
3Reliability
If long-term monitoring is implemented, then detection reliability is improved, but device durability requirements increase
Solution Approach 1:
The patent employs a flexible polymer membrane as the pressure-sensing interface. This thin film structure provides long-term durability while maintaining biocompatibility and resistance to biofouling. The flexible membrane can withstand continuous exposure to cerebrospinal fluid and mechanical stresses over extended periods, ensuring reliable long-term monitoring.
Solution Approach 2:
The patent utilizes composite material structures for the sensor housing and membrane assembly, combining materials with complementary properties for enhanced durability. The composite construction provides mechanical strength, chemical resistance, and biocompatibility simultaneously, enabling the device to function reliably for long-term implantation.
4Object-affected harmful factors
If wireless sensing is implemented, then invasiveness is reduced, but energy requirements increase
Solution Approach 1:
The patent implements periodic wireless transmission of pressure data rather than continuous transmission. The sensor measures pressure continuously but transmits data at scheduled intervals or when threshold changes are detected, significantly reducing energy consumption while maintaining effective monitoring capability and minimizing invasiveness.
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 a noninvasive, long-term monitoring system that reduces the risk of infection, detects shunt occlusions, and extends the lifespan of hydrocephalus shunts by preventing obstruction, while maintaining sterility and compatibility with existing medical procedures.
Implementation Method 1
The RF energy is harvested through a coil antenna connected with a wireless power receiver that converts it immediately into electricity.
Implementation Method 2
The wireless pressure sensor can be mounted within the hollow portion of a hydrocephalus shunt's reservoir
Data Source
AI summary
A long-lasting, wireless, biocompatible pressure sensor device is integrated within a hydrocephalus shunt, either within the shunt's reservoir/anchor or as an inline or pigtailed connector. When integrated within a typical reservoir, the device can sit within the reservoir's hollow frustum area covered by the resilient silicone dome of the reservoir. When integrated as an inline connector, the device can sit at any point on the peritoneal catheter or ventricular catheter, including between the VP shut's valve and reservoir. The pressure sensor device includes electronics that can be powered wirelessly by a reader held to a patient's scalp, and so no battery may be required. The reader can transmit an ambient, atmospheric pressure reading from outside the skull to the implanted device so that its electronics can calculate a calibrated gauge pressure internally and then relay it to a patient's smart phone.