Biodegradable Polyesteramide Coating for Medical Implants
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Solution Overview
Problem
Biodegradable polyesteramide coatings used in the biomedical industry face challenges with adhesion to substrates, degradation rates, and drug release, failing to meet high industry standards, particularly in the need for improved adhesion properties and controlled degradation for medical devices.
Innovation Solution
A biodegradable polyesteramide coating with a specific composition comprising two different functional groups, including unprotected hydrophilic and protected hydrophobic groups, is developed, which enhances adhesion to medical devices, increases degradation rate in the presence of enzymes, and provides distinctive drug-release properties, eliminating the need for substrate pretreatment or primers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional biodegradable polyesteramide coatings are used, then the coating provides basic protection and drug delivery, but the adhesion to substrates is insufficient requiring pretreatment or primers
Solution Approach 1:
The patent modifies the chemical composition parameters of the polyesteramide polymer by incorporating specific functional groups (carboxyl, hydroxyl, amino groups) in controlled ratios. This changes the surface chemistry parameters of the coating to enhance adhesion to substrate materials without requiring additional pretreatment processes
Solution Approach 2:
The patent creates a composite polymer structure combining polyesteramide backbone with pendant functional groups (carboxyl, hydroxyl, amino). This composite material approach integrates multiple functional capabilities within a single coating layer, achieving both adhesion and drug delivery functions
2Productivity
If biodegradable polyesteramide coatings are used, then the coating degrades over time, but the degradation rate is not controlled and may be too slow for targeted delivery
Solution Approach 1:
The patent controls the degradation rate by adjusting the ratio of hydrophilic to hydrophobic functional groups in the polymer. Higher hydrophilic content increases water penetration and enzymatic access, accelerating degradation, while hydrophobic groups provide structural stability. This parameter tuning allows precise control of degradation kinetics
Solution Approach 2:
The coating is designed with dynamic degradation characteristics that evolve over time. The dual-functional group structure allows the coating to maintain stability initially (protecting the drug), then progressively degrade as enzymes penetrate and cleave ester bonds, releasing the drug in a time-dependent manner
3Adaptability or versatility
If conventional polyesteramide coatings are used, then the coating structure is simple, but the drug release properties are not distinctive or controlled
Solution Approach 1:
The patent introduces local functional variations within the polymer structure by attaching different pendant groups (carboxyl, hydroxyl, amino) at specific positions along the polyesteramide backbone. These local functional differences create zones with distinct drug interaction properties, enabling controlled release mechanisms
Solution Approach 2:
The multifunctional polyesteramide coating simultaneously performs multiple functions: adhesion to substrate, drug loading, controlled drug release, and biodegradation. The diverse functional groups (carboxyl for metal coordination, hydroxyl for hydrogen bonding, amino for drug interaction) provide universal applicability across different drug types and delivery scenarios
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 coating exhibits improved adhesion, homogeneity, and wear resistance, with accelerated degradation and controlled drug release, ensuring better performance and compatibility with medical devices, facilitating faster clearance from the body and extended drug release.
Implementation Method 1
coatings based on biodegradable polymers comprising different functional groups at a relative ratio in the polymer backbone provide enhanced adhesion to substrates
Implementation Method 2
show an increased degradation rate of in the presence of enzymes
Data Source
Figure 1
Figure 2A~2C
Figure 3
AI summary
The invention relates to a coating comprising a biodegradable polymer comprising at least two different functional groups pendant to the polymer backbone, which functional groups are selected from the group of carboxyl-, amine, hydroxyl, ester, amide-, thiol- or thioester groups. The two different functional groups comprise at least an unprotected hydrophilic functional group chosen from a carboxyl-, amine, thiol or hydroxyl group and at least a protected hydrophobic functional group chosen from an ester, amide- or thioester group. The invention further relates to an implantable device comprising the coating composition. The implantable device is includes cardiac pacemakers and defibrillators; leads and electrodes for the preceding, organ stimulators such as nerve, bladder, sphincter and diaphragm stimulators, prostheses, rods, vascular grafts, self-expandable stents, balloon- expandable stents, stent-grafts, grafts, catheters, artificial heart valves and cerebrospinal fluid shunts.