Nanofibrous Polyurethane Scaffold for Stem Cell Containment
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Solution Overview
Problem
Current treatments for coronary heart disease, including stem cell therapies and electronic pacemakers, face limitations such as off-target effects, migration issues, battery life concerns, sensitivity to magnetic fields, and complications during implantation, which hinder effective and safe cardiac function restoration.
Innovation Solution
A non-degradable, nanofibrous polyurethane scaffold (BioGenerator) is developed to encapsulate stem cells, allowing controlled release of regenerative factors and preventing cell migration, while enabling gap junction formation with native cardiomyocytes for targeted cardiac repair and pacing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If stem cells are used as biological pacemakers, then appropriate cardiac response to exercise and emotions is achieved, but stem cell migration to other areas causes fibrillation, non-cardiac muscle beating, or cancer
Solution Approach 1:
The patent employs a flexible, biocompatible membrane enclosure that contains stem cells while allowing selective passage of nutrients, waste products, and electrical signals. This membrane acts as a physical barrier preventing cell migration to other heart areas while maintaining the cells' ability to respond to physiological stimuli and provide appropriate cardiac pacing functions.
Solution Approach 2:
The patent utilizes a porous scaffold structure with controlled pore sizes that permit the passage of molecules and electrical signals while physically constraining stem cells within the designated area. The porous design allows for nutrient diffusion and electrical conduction necessary for cell viability and function, while the pore geometry prevents cell escape and migration to adjacent tissues.
2Reliability
If electronic pacemakers are used, then heart rate and rhythm problems are solved, but battery life requires repeated operations to replace the battery
Solution Approach 1:
The patent employs stem cells that possess intrinsic ability to generate electrical signals and regulate heart rate without requiring external power sources. The biological pacemaker function is achieved through the cells' natural electrophysiological properties, eliminating the need for battery replacement and enabling continuous operation throughout the patient's lifetime.
Solution Approach 2:
The patent replaces the mechanical/electronic pacemaker system with a biological system using stem cells. This substitution eliminates the battery component entirely, as living cells generate their own electrical energy through metabolic processes and ion channel activity, thereby removing the limitation of finite battery life and enabling indefinite operation.
3Reliability
If electronic pacemakers are used, then heart rhythm control is achieved, but sensitivity to magnetic fields and lead failure occur
Solution Approach 1:
The patent replaces the electronic pacemaker system with a biological stem cell-based system that generates electrical signals through cellular electrophysiology rather than electronic circuits. This fundamental substitution eliminates sensitivity to magnetic fields, as biological cells do not contain electronic components that can be interfered with by external magnetic fields, thereby improving reliability in diverse environmental conditions.
4Ease of operation
If biodegradable scaffolds are used for hMSC containment, then cell delivery is enabled, but device removal is not permitted if required
Solution Approach 1:
The patent employs a dynamic scaffold system that can be configured in different forms and configurations to suit specific delivery requirements. The scaffold's physical and chemical properties can be adjusted to optimize cell containment and delivery, and the system can be adapted or removed based on patient needs and treatment progress, providing flexibility in both delivery capability and subsequent management.
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 scaffold provides a minimally invasive, removable, and biocompatible solution for localized stem cell delivery, enhancing cardiac function with reduced off-target effects and improved safety, allowing for effective pacing and repair without the limitations of traditional treatments.
Implementation Method 1
The nanofibrous matrix is porous enough to allow for outward paracrine diffusion
Implementation Method 2
The hMSCs sustain normal function on the electrospun polyurethane surface while being contained within the device
Data Source
AI summary
The invention is directed to a device and method to prevent migration of Human Mesenchymal Stem Cells (hMSCs) from a delivery site while allowing communication between the stem cells and native cardiomyocytes. The device is characterized by scaffold pore size, fiber diameter and biomaterial selection. The invention includes a two part polyurethane scaffold that prevents migration of stem cells, allows gap junction formation through pores and is packaged for minimally invasive delivery.