Metal-Salen Complex Grain Size Control for Magnetic Drug Delivery
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Solution Overview
Problem
Metal-salen complex compounds face challenges in achieving an optimal grain size for capillary passage and magnetic guidance, as sizes too small lack magnetism and sizes too large cannot pass through capillaries, necessitating a controlled grain size for effective drug delivery.
Innovation Solution
The metal-salen complex compound is formulated to have a crystal grain size of 1 µm or less to ensure capillary passage and ferromagnetism, with a preferred range of 100 nm to 500 nm, allowing for targeted delivery and retention with an external magnetic field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the grain size of metal-salen complex is increased to enhance magnetic properties, then magnetic guidance capability is improved, but the ability to pass through capillaries deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the grain size of metal-salen complex particles to fall within the 100 nm to 500 nm range. This specific parameter range simultaneously satisfies two contradictory requirements: it is large enough to exhibit sufficient ferromagnetic properties for magnetic guidance, yet small enough to pass through biological capillaries for systemic delivery to the target site.
2Length of moving object
If the grain size of metal-salen complex is decreased to improve capillary passage, then ability to pass through capillaries is improved, but magnetic properties deteriorate
Solution Approach 1:
The patent resolves this contradiction by establishing a lower bound for grain size at 100 nm. Particles smaller than this would lack sufficient magnetic moment for effective magnetic guidance and retention at the target site. By setting this minimum size threshold while maintaining the upper bound of 500 nm for capillary passage, the patent optimizes both magnetic responsiveness and biodistribution.
3Reliability
If large grain size is used to ensure magnetic guidance, then magnetic retention at target site is improved, but capillary clogging occurs
Solution Approach 1:
The patent prevents capillary clogging by strictly limiting the maximum grain size to 500 nm, which is smaller than the typical diameter of biological capillaries (5-10 µm). This parameter control ensures that particles can navigate the vascular system without obstruction while still being large enough to exhibit ferromagnetic behavior for reliable magnetic retention at the target site through external magnetic field application.
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 controlled grain size enables the compound to be effectively guided to and retained at the target site, minimizing adverse reactions and maximizing therapeutic effects while avoiding capillary clogging.
Implementation Method 1
the usability of the metal-salen complex may be further improved if the dynamics of the metal-salen complex can be controlled, such as by inducing the metal-salen complex to be retained in the affected tissue with a magnetic field after local application to the affected tissue
Implementation Method 2
The metal-salen complex compound is auto-magnetic, and is capable of being retained in the affected site with an external magnetic field
Data Source
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AI summary
The present invention provides a metal-salen complex compound of the formula shown below having a controlled grain size that enables the metal-salen complex compound to exert its pharmacological effects as anticancer drug, at a target region, when guided by magnetic fields to the affected tissue. This metal-salen complex compound has a crystal grain size of 8 µm or less, and that is represented by the chemical formula below. N,N'-Bis(salicylidene)ethylenediamine metal M is Fe, Cr, Mn, Co, Ni, Mo, Ru, Rh, Pd, W, Re, Os, Ir, Pt, Nd, Sm, Eu, or Gd.