DMEK Injector Coating Reduces Friction and Adhesion
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Solution Overview
Problem
Current DMEK graft injectors cause significant endothelial cell loss due to mechanical trauma and adhesion during loading, transportation, and insertion, which can lead to reduced graft survival and prolonged recovery times.
Innovation Solution
A non-adhesive organosilane coating is applied to the interior surface of the injector, reducing friction and adhesion between the graft and the injector, using materials like polyethylene glycol and amine groups to enhance hydrophilicity and lubricity, and potentially incorporating antimicrobial agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a standard injector body is used without coating, then the device structure is simple and easy to manufacture, but significant endothelial cell loss occurs due to mechanical trauma and adhesion
Solution Approach 1:
A coating layer is introduced as an intermediary between the injector body and the corneal graft. This coating acts as a mediator that reduces direct contact and adhesion between the graft and the injector surface, thereby reducing mechanical trauma and improving graft survival while maintaining the basic injector structure
Solution Approach 2:
The surface properties of the injector body are modified by applying a coating with different physical and chemical parameters (hydrophilicity, surface energy, friction coefficient). This changes the interaction parameters between the injector and graft, reducing adhesion and mechanical trauma without altering the fundamental injector design
2Reliability
If the injector body material is used as-is, then manufacturing is simple, but friction and adhesion between the graft and injector surface are high causing cell loss
Solution Approach 1:
The surface parameters of the injector are modified through coating application, changing friction and adhesion characteristics. This allows the same base material to provide improved biocompatibility and reduced cell trauma while maintaining manufacturing simplicity of the base component
Solution Approach 2:
The injector system becomes a composite structure combining the base injector material (e.g., glass, plastic) with a specialized coating material (organosilane, PEG, amine groups). This composite approach leverages the structural properties of the base material while adding the functional properties of the coating to reduce adhesion and improve cell survival
3Reliability
If no coating is applied, then the device is easy to clean and maintain, but mechanical trauma to the graft during handling is significant
Solution Approach 1:
The coating serves as a protective intermediary layer that reduces mechanical trauma during handling and insertion. This layer absorbs and distributes mechanical stresses, protecting the graft while the coating itself can be cleaned and maintained according to standard protocols
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 significantly reduces endothelial cell loss during handling and transplantation, improving graft survival and surgical outcomes by minimizing mechanical trauma and adhesion, thereby extending the lifespan of the graft.
Implementation Method 1
the coating includes a material that is more hydrophilic than the material that forms the injector body
Implementation Method 2
the coating includes a functional bioactive moiety compatible with the graft that lubricates the interior surface
Implementation Method 3
the coating reduces adhesion of corneal tissue to the injector body compared to an injector body without the coating
Data Source
AI summary
A graft injector assembly includes a coating disposed on an interior surface of an injector body to form a lumen. The lumen is structured to store a graft comprising corneal tissue and to allow the graft to exit distally from the injector body, preferably with minimal or no damage to the corneal tissue. The corneal tissue may include a Descemet membrane and endothelial cells, which may be used in Descemet Membrane Endothelial Keratoplasty (DMEK). In one example, the assembly includes an organosilane coating disposed on a glass injector body.