Laser Curing Siloxane Adhesive for Drug Delivery Devices
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Solution Overview
Problem
Existing methods for manufacturing drug delivery devices, such as intravaginal rings and implants, face challenges in attaching elastomer-based parts quickly and efficiently while minimizing heat exposure to sensitive active agents, which can lead to degradation or melting, and require lengthy curing times for self-curing adhesives, making them unsuitable for industrial-scale production in cleanroom environments.
Innovation Solution
The method involves using non-cured siloxane-based elastomer adhesive material that is cured rapidly using laser radiation, focusing energy on a specific area to induce cross-linking without heating the entire device, allowing for fast and effective attachment of device parts while preserving the active agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If self-curing silicone adhesive material is used to attach elastomer-based parts, then the adhesive can cure without heat treatment, but the curing time is at least 24 hours which creates a bottleneck in production
Solution Approach 1:
The invention changes the curing parameters of the adhesive material by introducing laser irradiation as a new curing mechanism. Instead of relying on slow self-curing or heat treatment, the adhesive is formulated to cure rapidly under laser irradiation, transforming the curing process from a time-consuming chemical reaction to a fast photochemical process that completes in seconds
Solution Approach 2:
The invention replaces the thermal curing mechanism with optical curing. A laser beam is used to irradiate and cure the adhesive material between elastomer parts, substituting the slow thermal or moisture-based self-curing process with a rapid photochemical curing process that dramatically reduces production time
2Productivity
If heat is applied to cure adhesive material, then curing speed increases, but active agents with low melting point may melt or degrade
Solution Approach 1:
The invention replaces thermal energy with optical energy for the curing process. Instead of using heat to accelerate adhesive curing, a laser beam provides the energy needed for photochemical curing, eliminating thermal damage to temperature-sensitive active agents while achieving rapid curing
Solution Approach 2:
The invention changes the energy type and curing parameters from thermal to optical. The adhesive material is formulated with photoinitiators that activate under laser irradiation, allowing curing to proceed at room temperature or with minimal heat generation, thus protecting low-melting-point active agents from degradation
3Productivity
If laser radiation is used to cure adhesive material, then curing time is reduced to milliseconds to seconds, but the laser energy must be precisely controlled to avoid damaging the device
Solution Approach 1:
The invention applies laser irradiation locally and selectively only to the adhesive material between elastomer parts. The laser beam is precisely directed to cure only the required area, avoiding unnecessary exposure of other device components to high energy, thus maintaining manufacturing precision while achieving rapid curing
Solution Approach 2:
The system incorporates feedback control to monitor and adjust laser energy delivery during the curing process. By controlling the laser parameters and monitoring the curing progress, the system ensures that sufficient energy is delivered to cure the adhesive completely while preventing excessive energy that could damage the device
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 approach enables rapid curing of adhesive materials within milliseconds to seconds, forming strong connections without degrading the active agents, thus speeding up the production process and ensuring the integrity of the drug delivery devices.
Implementation Method 1
curing the said adhesive material by subjecting it to radiation energy from a laser source
Data Source
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AI summary
The invention relates to a method for producing a drug delivery device, which has a body comprising a siloxane-based elastomer and at least one active agent. The method comprises applying adhesive material, which comprises non-cured siloxane based elastomer, into a contact with the body and curing the said adhesive material by subjecting it to radiation energy from a laser source. The invention relates also to a drug delivery device manufactured according to the method.