Implantable Magnetic Infusion Pump for Targeted Joint Drug Delivery
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Solution Overview
Problem
Current medical agent delivery methods, such as systemic administration and implantable devices, face challenges in achieving targeted and sustained drug delivery to specific body locations, leading to subtherapeutic levels and increased risk of side effects, particularly in treating joint infections like PJI, where antibiotics struggle to reach effective concentrations within the joint capsule.
Innovation Solution
An implantable magnetically driven infusion pump system with a refillable reservoir, actuated by an external magnetic field controller, ensures precise and controlled delivery of medical agents directly to the target site, allowing for adjustable dosing schedules and minimizing surface exposure, thus avoiding the limitations of traditional implantable devices and systemic administration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If systemic administration (intravenous injection) is used to achieve high blood serum concentration of antibiotic, then the antibiotic concentration in blood reaches near safe limit, but the concentration at the infection site (joint capsule) remains subtherapeutic due to synovial barrier
Solution Approach 1:
The patent introduces an implantable pump system as an intermediary device that delivers antibiotic directly to the joint capsule, bypassing the synovial barrier limitation. The pump acts as a mediator between the systemic circulation and the localized infection site, enabling direct drug placement where it is needed most.
Solution Approach 2:
The invention implements local quality by concentrating the antibiotic delivery specifically at the infection site (joint capsule) rather than distributing it systemically. This localized approach ensures high therapeutic concentration where needed while avoiding the barrier limitations of systemic administration.
2Reliability
If external infusion pumps with continuous tubing connection are used to deliver medical agent to targeted location, then direct delivery to site is achieved, but surface skin exposure creates hygiene burden and infection risk
Solution Approach 1:
The patent extracts the pump mechanism from the external environment and implants it internally within the patient's body. This removal of the external pump eliminates the need for continuous skin penetration and tubing connections, thereby removing the primary source of infection risk while maintaining accurate drug delivery capability.
Solution Approach 2:
The implantable pump serves as an internal intermediary that eliminates the need for external skin access. By placing the pumping mechanism inside the body, it mediates between the drug reservoir and the target site without requiring continuous external connection, thus preventing infection.
3Object-affected harmful factors
If implantable drug delivery devices are used to deliver specific amounts to targeted location without surface exposure, then infection risk is reduced, but the devices require complex electronics and batteries that increase device complexity
Solution Approach 1:
The patent replaces complex electronic pumping mechanisms with a simple mechanical pump design that can be actuated by magnetic fields. This substitution eliminates the need for batteries, electronic circuits, and complex control systems, significantly reducing device complexity while maintaining the ability to deliver precise drug amounts implantably.
Solution Approach 2:
An external magnetic field is introduced as a mediator to actuate the implantable pump without requiring internal power sources or electronics. The magnetic field serves as a wireless control mechanism that simplifies the implanted device structure while enabling precise pump activation and drug delivery.
4Duration of action of moving object
If polymeric implants are used for controlled drug delivery, then sustained release is achieved, but the release kinetics depend on drug solubility and diffusion coefficients that may not provide adequate delivery rate
Solution Approach 1:
The patent replaces passive polymeric diffusion-based release mechanisms with an active mechanical pump system. This substitution allows for controllable, active pumping of the drug solution at regulated rates, independent of drug solubility or diffusion coefficients, thereby maintaining both sustained delivery duration and adequate delivery rate.
Solution Approach 2:
The invention introduces dynamic control of drug delivery through a mechanically actuated pump system. Unlike static polymeric implants with fixed release kinetics, the pump can be dynamically activated and controlled to deliver drug at variable rates, providing both sustained duration and adjustable productivity.
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 provides sustained and targeted delivery of medical agents, reducing the need for frequent device replacements and minimizing systemic side effects, while maintaining biocompatibility and safety, enabling effective treatment of joint infections and other conditions with improved dosing accuracy and reduced patient burden.
Implementation Method 1
actuated by an external magnetic field controller
Implementation Method 2
implantable magnetically driven infusion pump system
Data Source
AI summary
An implantable externally driven fluid delivery system for localized delivery of medical agents and drugs, such as antibiotics, may be provided herein. The fluid delivery system includes a housing that incorporates a filling septum connected to a flexible internal reservoir. The reservoir is connected to a miniature diaphragm pump with coupled magnetic components. The entire fluid delivery system is implantable into a body cavity or surgically formed location that provides for local medical agent delivery. The reservoir is filled via percutaneous injection through the skin into the septum. Fluid delivery is achieved through proximity of the external controller that generates an oscillating or reversing magnetic field suitable to actuate the pump's diaphragm resulting in controlled fluid flow. Once local drug delivery treatment is complete, the controller can be discarded.