Honeycomb Retinal Scaffold With Through-Holes for Cell Integration

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Solution Overview

Problem

Current treatments for visual impairment due to photoreceptor degeneration, such as AMD, lack effective methods to replace both photoreceptors and RPE, and existing scaffold technologies fail to provide mechanical stability, high cell density, and uniform cell distribution for improved grafted cell survival and functional visual rescue.

Innovation Solution

A biocompatible honeycomb-shaped scaffold with through-holes is designed to support photoreceptor and RPE cells, featuring hexagonal reservoirs for cell capture and through-holes for nutrient transport, promoting polarized cell growth and integration, using biodegradable materials like PDMS.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If simple bolus injection of cells is used for transplantation, then the transplantation process is simple, but cell survival and integration are poor

Engineering Contradiction:

Improvetransplantation process simplicityVSAvoidcell survival and integration

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The invention segments the cell transplantation process by using a scaffold structure with multiple reservoirs that can be pre-filled with organized cell layers (photoreceptors and RPE) before implantation. This segmentation allows complex cell organization to be achieved while maintaining a relatively simple single-step implantation procedure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The scaffold acts as an intermediary carrier between cell preparation and transplantation. It provides a structured platform that maintains cell organization and promotes integration, bridging the gap between simple injection and complex tissue reconstruction.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Device complexity

If planar scaffolds are used for RPE delivery, then the scaffold structure is simple, but cell density and organization are insufficient

Engineering Contradiction:

Improvescaffold structure simplicityVSAvoidcell density and organization

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The invention transitions from two-dimensional planar scaffolds to three-dimensional honeycomb reservoir structures. This dimensional change enables higher cell density and better organization while maintaining manufacturing feasibility through standardized reservoir patterns.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The scaffold employs nested structures where multiple cell layers (RPE and photoreceptors) are organized within confined reservoir spaces, achieving high cell density and precise spatial organization similar to native retinal architecture.

Inventive Principle:

Principle #7Nested doll (Nesting)

3Productivity

If high cell density is achieved in scaffolds, then transplantation efficiency improves, but mechanical stability decreases

Engineering Contradiction:

Improvetransplantation efficiencyVSAvoidmechanical stability

Core Design Contradiction:

ProductivityVSStrength

Solution Approach 1:

The scaffold utilizes composite material construction combining biocompatible polymers with structured honeycomb geometry, achieving both high cell density capacity and mechanical stability. The composite structure provides strength while accommodating dense cell populations.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The honeycomb reservoirs employ curved three-dimensional geometries that provide structural strength and mechanical stability while maximizing internal volume for cell accommodation, enabling high cell density without compromising scaffold integrity.

Inventive Principle:

Principle #14Spheroidality (Curvature)

4Reliability

If uniform cell distribution is achieved, then grafted cell integration improves, but manufacturing complexity increases

Engineering Contradiction:

Improvecell integrationVSAvoidmanufacturing complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The scaffold divides the transplantation target into multiple discrete reservoirs with standardized geometries, enabling uniform cell distribution through systematic cell allocation to each reservoir while simplifying the manufacturing process through modular design.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention standardizes reservoir parameters (size, shape, spacing) to achieve uniform cell distribution. By controlling geometric parameters and spatial arrangement, consistent cell integration is achieved without requiring complex manufacturing processes.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12448595B2Mechanically stable and high cell density honeycomb retinal scaffold design for transplantation therapy of photoreceptor cells and retinal pigment epithelium

Publication Date: 2025.10.21 WISCONSIN ALUMNI RES FOUND

AI summary

Photoreceptor scaffolds that can be used for transplantation of organized photoreceptor tissue, with or without retinal pigment epithelial cells, which may improve grafted cell survival, integration, and functional visual rescue are disclosed herein. The scaffolds include a cell support layer having at least one honeycomb-shaped reservoir fluidly connected to a plurality of through-holes and at least one cell in the at least one honeycomb-shaped reservoir.