Skull-Mounted Drug Sensor with Optical Feedback
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Solution Overview
Problem
The existing Ommaya reservoir technology for delivering chemotherapy to the brain is associated with risks such as infections, malposition, blockages, and improper drug delivery, leading to toxic drug levels, sub-therapeutic concentrations, and elevated brain CSF pressure, which can result in drug resistance and hydrocephalus.
Innovation Solution
A skull-mounted drug and pressure sensor system connected to an implanted pump, featuring a dual lumen catheter with optical sensors to measure drug concentrations in cerebrospinal fluid, providing real-time monitoring and data communication to external devices, and a stand-alone system with wireless communication for independent operation, allowing for precise drug delivery and pressure management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If Ommaya reservoir is used for intraventricular drug delivery, then minimally invasive access to brain is achieved, but risks of infection, malposition, and catheter blockage increase
Solution Approach 1:
The patent incorporates pressure sensors and optical sensors that provide real-time feedback on catheter position, drug concentration, and ventricular pressure. This feedback mechanism allows for monitoring and adjustment to prevent malposition, blockage, and improper drug delivery, thereby reducing infection and malfunction risks while maintaining minimally invasive access.
Solution Approach 2:
The patent replaces traditional mechanical reservoir systems with an implantable pump system that uses electronic control and sensing mechanisms. This substitution enables more reliable drug delivery through electronic monitoring of pressure and drug concentration, reducing the mechanical failures and infections associated with traditional Ommaya reservoirs.
2Speed
If bolus injection of chemotherapy drugs is administered, then rapid drug delivery is achieved, but toxic drug levels and sub-therapeutic concentrations occur
Solution Approach 1:
The patent uses optical sensors to continuously monitor drug concentration in the cerebrospinal fluid and provides real-time feedback to the control system. This enables precise adjustment of pump delivery rates to maintain therapeutic drug levels, preventing both toxic peaks and sub-therapeutic troughs that occur with bolus injection.
Solution Approach 2:
The patent implements a dynamic drug delivery system where the pump rate is continuously adjusted based on real-time feedback from pressure and optical sensors. This dynamic control allows the system to adapt delivery speed to maintain optimal drug concentrations, replacing the static bolus injection approach with a responsive, continuously adjustable system.
3Reliability
If chemotherapy drugs are delivered to the brain, then treatment of brain cancer is achieved, but elevated brain CSF pressure and hydrocephalus occur
Solution Approach 1:
The patent incorporates pressure sensors that continuously monitor ventricular pressure and provide real-time feedback to the control system. When elevated pressure is detected, the system automatically adjusts drug delivery rates or triggers alerts to prevent hydrocephalus, thereby maintaining treatment efficacy while managing CSF pressure.
Solution Approach 2:
The patent replaces traditional pressure monitoring methods with electronic pressure sensors and automated control systems. This substitution enables real-time detection and response to pressure changes, allowing for proactive management of CSF pressure to prevent hydrocephalus while maintaining effective cancer treatment.
4Measurement precision
If optical sensors are integrated into the skull-mounted body, then real-time drug monitoring is achieved, but device complexity increases
Solution Approach 1:
The patent integrates multiple sensing functions (optical drug detection and pressure monitoring) into a single skull-mounted body housing. This multi-functional integration allows real-time monitoring of both drug concentration and ventricular pressure without requiring separate devices, thereby achieving comprehensive monitoring while managing overall system complexity through unified design.
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 system enables accurate drug delivery and monitoring, preventing toxic levels, ensuring therapeutic concentrations, and managing CSF pressure, thereby reducing the risk of drug resistance and hydrocephalus, while maintaining a minimally invasive approach.
Implementation Method 1
an optical sensor to detect drugs in a chamber built into a catheter
Data Source
AI summary
A skull-mounted drug and pressure sensor (SOS), a smart pump (ISP) electrically coupled to the SOS and a drug delivery and communications catheter communicating the SOS with the ISP are combined for a first embodiment. A skull-mounted (SOS), a metronomic biofeedback pump (MBP) electrically coupled to the SOS and a drug delivery and communications catheter having a sending and receiving optical fiber communicating the SOS with the MBP are combined for a second embodiment. A third embodiment combines a (SOS), an implantable power and communication unit (PCU) electrically coupled to the SOS, and a drug delivery and communications catheter for communicating the SOS with the PCU and for communicating the exterior source of the drug to the SOS. A fourth embodiment combines a ventricular catheter with a CSF accessible chamber and drug delivery port; and an implantable stand-alone skull-mounted drug and pressure sensor (SPS).