Biocompatible Non-Ferrous Electroosmotic Pump for MRI-Compatible Implantable Drug Delivery
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current implantable drug delivery devices face challenges such as inconsistent dosages, incompatibility with MRI environments, mechanical failures, and toxicity risks due to ferrous materials and poor design.
Innovation Solution
The development of a biocompatible, non-ferrous electroosmotic pump (EOP) with bidirectional flow capabilities, designed for implantable medical devices. This pump uses a working fluid to drive bellows, allowing for precise delivery of a payload fluid through a series of valves and catheters, and includes a sensing system to monitor pump state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional ferrous pump components are used, then mechanical strength and structural stability are improved, but MRI compatibility and patient safety are worsened
Solution Approach 1:
The patent removes ferrous materials from the pump components and replaces them with non-ferrous alternatives such as titanium, stainless steel, or biocompatible polymers. This extraction of harmful ferrous elements enables MRI compatibility while maintaining mechanical strength through the use of alternative materials with sufficient structural properties.
Solution Approach 2:
The patent employs composite material strategies by combining non-ferrous metals like titanium with biocompatible polymers or coatings. These composite structures provide both the mechanical strength required for pump operation and the MRI compatibility needed for patient safety, resolving the contradiction between structural integrity and magnetic resonance imaging compatibility.
2Reliability
If peristaltic pump mechanisms with ball bearings are used, then pumping reliability is improved, but long-term mechanical failure risk is worsened
Solution Approach 1:
The patent replaces the mechanical peristaltic pump mechanism with ball bearings with an electroosmotic pump mechanism that uses electrical fields to drive fluid flow through charged porous membranes. This substitution eliminates moving mechanical parts that are prone to wear and failure, thereby extending the functional life of the implant while maintaining reliable pumping action through electrochemical forces.
Solution Approach 2:
The electroosmotic pump is divided into multiple independent pumping units or channels, each capable of functioning autonomously. This segmentation ensures that if one unit fails, others can continue to operate, maintaining overall pumping reliability while extending the effective functional life of the device through redundancy.
3Power
If high power motors are used, then pumping capability is improved, but battery size and functional life are worsened
Solution Approach 1:
The patent replaces high-power mechanical motors with low-power electroosmotic pumping mechanisms that utilize electrical fields and ionic conduction to move fluids. This substitution dramatically reduces power consumption while maintaining adequate pumping capability, thereby extending battery life and the overall functional life of the implantable device without requiring larger batteries.
Solution Approach 2:
The patent changes the operating parameters of the pump system by using electroosmotic flow driven by low-voltage electrical fields instead of high-power mechanical rotation. This parameter change from mechanical power to electrical field-driven flow reduces energy consumption and extends the duration of battery-powered operation, improving functional life while maintaining pumping capability.
4Device complexity
If single catheter design is used, then device simplicity is improved, but delivery reliability is worsened
Solution Approach 1:
The patent divides the drug delivery system into multiple independent catheters or delivery channels instead of using a single catheter. Each catheter can be independently controlled and monitored, ensuring that if one becomes obstructed or fails, others can continue to deliver medication, thereby improving overall delivery reliability while maintaining manageable device complexity through modular 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
The EOP ensures consistent and precise medication delivery, is compatible with MRI environments, reduces the risk of mechanical failure and toxicity, and provides continued medication delivery even if one catheter becomes obstructed.
Implementation Method 1
an electroosmotic element that moves a working fluid in response to an applied voltage
Data Source
AI summary
A bidirectional electroosmotic pump may be provided. The bidirectional electroosmotic pump may be made of materials that are biocompatible and non-ferrous. The bidirectional electroosmotic pump may be part of an implantable medical device for the purpose of medicine delivery. The bidirectional electroosmotic pump may contain a working fluid and may facilitate the delivery of a separate payload fluid. In an exemplary embodiment, the bidirectional pump may contain bellows which may allow the pump to deliver the payload fluid through a series of valves and/or catheters. In another embodiment the bidirectional electroosmotic pump may contain a pump sensing mechanism to monitor the state of the pump.