Multi-Unit Drug Delivery for Low-Solubility Release Control
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Solution Overview
Problem
Existing drug delivery devices struggle to release low solubility drugs at therapeutically useful rates over an extended period, and lack control over drug release kinetics, particularly in environments with varying pH levels.
Innovation Solution
The development of implantable drug delivery devices with distinct units for drugs and functional agents, utilizing osmotic pumping and diffusion mechanisms to achieve controlled release, allowing for varied release profiles and enhanced control over drug delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If osmotic pumping is used to release drugs, then release rate is improved for highly water-soluble drugs, but it fails for low solubility drugs
Solution Approach 1:
The device segments the drug delivery system into multiple independent units or chambers, each capable of containing different drugs with varying solubility characteristics. This allows the device to simultaneously or sequentially deliver highly water-soluble drugs via osmotic pumping and low solubility drugs via diffusion, resolving the contradiction between release rate improvement and versatility loss.
2Device complexity
If a single drug reservoir is used, then device simplicity is maintained, but control over drug release kinetics is limited
Solution Approach 1:
The single drug reservoir is divided into multiple separate chambers or compartments, each capable of holding different drugs or formulations. This segmentation enables independent control of release kinetics for each drug through separate aperture configurations, while maintaining overall device structural simplicity and avoiding the need for complex multi-device systems.
Solution Approach 2:
The device incorporates dynamically adjustable aperture mechanisms that can modify the size, shape, or number of open pores in real-time. This dynamic control allows precise regulation of drug release kinetics from each chamber, enabling adaptation to different therapeutic requirements without increasing fundamental device complexity.
3Productivity
If apertures are used for drug release, then drug delivery is achieved, but pH dependency limits therapeutic effectiveness
Solution Approach 1:
Different chambers or regions of the device are equipped with apertures having different properties (size, shape, material composition, surface charge) tailored to the specific pH stability requirements of each drug. This local optimization allows each drug to be delivered efficiently through apertures that are specifically designed to minimize pH-dependent degradation or precipitation for that particular drug.
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 devices enable the delivery of low solubility drugs at therapeutically effective rates with controlled release profiles, overcoming pH dependency and improving drug delivery efficiency.
Implementation Method 1
Osmotic pumping or diffusion may be the dominant mechanism by which the drug is released from the reservoir
Implementation Method 2
Osmotic pumping or diffusion may be the dominant mechanism by which the drug is released from the reservoir
Data Source
AI summary
Implantable drug delivery devices include a housing defining a reservoir, a first unit within the reservoir, and a second unit within the reservoir. The first unit contains a drug and the second unit contains a functional agent that facilitates release of the drug. Intravesical drug delivery devices include a housing portion containing a drug formulation and a housing portion containing an excipient, and are configured to release the drug according to a first release profile and the excipient according to a second release profile. Methods include inserting any of these devices into a patient and releasing drug from the device.