Short answer

When designing devices for delivering sensitive biological materials, consider additive manufacturing techniques like stereolithography for precise control over micro-scale features, and investigate material properties that can be leveraged to enhance delivery efficiency.

Field: Final Production
Source: Scholar Commons (2018)
Method: Experimental, Comparative Analysis
Evidence: Strong effect

Stereolithography-fabricated microneedle assemblies can successfully extrude microencapsulated cells in hydrogels without compromising cell viability. This final production research insight is drawn from a 2018 study published in Scholar Commons. Using Experimental, comparative analysis, researchers explored how this design variable affects real-world outcomes. The key design takeaway: When designing devices for delivering sensitive biological materials, consider additive manufacturing techniques like stereolithography for precise control over micro-scale features, and investigate material properties that can be leveraged to enhance delivery efficiency.

Study

Final ProductionHigh ImpactStrong effect

3D Printed Microneedles Maintain Cell Viability in Hydrogel Extrusion

Stereolithography-fabricated microneedle assemblies can successfully extrude microencapsulated cells in hydrogels without compromising cell viability.

Scholar Commons · 2018

Key Findings

01No significant difference in HepG2 cell viability was observed between extruded and control samples at 2h and 24h post-atomization.
02Hydrogel bioerosion led to an increase in extrusion yield.
03No significant difference in percentage relative payload was found when extrusion occurred at 2h versus 24h post-atomization.

Application

Design takeaway

How to apply

When developing micro-scale delivery systems, explore 3D printing technologies to create custom nozzle geometries and consider the material properties of the payload and the delivery vehicle to optimize yield and viability.

Project actions

01Consider using 3D printing for creating custom microfluidic or delivery devices.
02Investigate the impact of material properties on the performance of your design.

Method & Evidence

AimTo assess the viability of human hepatocellular carcinoma (HepG2) cells encapsulated in alginate microcapsules after extrusion through a custom 3D-printed microneedle assembly.

MethodExperimental, Comparative Analysis

ProcedureHuman hepatocellular carcinoma (HepG2) cells were encapsulated in alginate microcapsules. These microcapsules were then extruded through a 3D-printed microneedle assembly fabricated using stereolithography. Cell viability was assessed at different time points (2h and 24h post-atomization) and compared between sheared and control samples. Hydrogel bioerosion and relative payload were also quantified.

ContextBiomedical device design, regenerative medicine, drug delivery systems

Variables

IV["Extrusion through microneedle assembly (vs. control)","Time post-atomization (2h vs. 24h)"]

DV["Cell viability","Percentage relative payload","Extrusion yield"]

CV["Alginate concentration","Microcapsule size","Microneedle assembly design (number of needles, geometry)","Flow rate"]

Strengths & Limitations

Strengths

+Novel application of 3D printing for microneedle fabrication.
+Direct assessment of cell viability post-extrusion.

Limitations

The study used specific materials and a particular 3D printing method; adapting this to other materials or printing technologies might yield different results. The long-term effects on cell viability were not assessed.

Reliability & validity

Reliability could be improved by repeating extrusions with identical parameters. Validity is supported by direct measurement of cell viability and payload, though the specific cell line and hydrogel limit generalizability.

Think critically

How might the surface roughness of the 3D-printed nozzle affect cell viability or payload integrity, and what strategies could be employed to mitigate any negative impacts?

Design Principles

"Leverage additive manufacturing for precise micro-scale feature creation to enable controlled delivery of sensitive biological materials."

This research demonstrates a novel manufacturing approach for delivering therapeutic cells. By utilizing 3D printing for precise microneedle fabrication, designers can create devices that enable controlled extrusion of cell-laden hydrogels, crucial for applications like wound healing and regenerative medicine.

What This Means for Your Design

Using a 3D printer to make tiny needles for delivering cells in a gel works well and doesn't hurt the cells.

How to use in your project

1.Reference this study when exploring the use of additive manufacturing for creating prototypes or final products, especially for micro-scale applications or sensitive material delivery.

Add to My Project

Quick Cite

Paragraph starter

The research by Bouzos et al. (2018) demonstrates the feasibility of using 3D-printed microneedle assemblies for the extrusion of microencapsulated cells, showing no significant impact on cell viability. This highlights the potential of additive manufacturing in creating precise delivery systems for sensitive biological materials, a key consideration in advanced design projects.

Source

Scholar Commons

Three-Dimensional (3D) Printed Microneedles for Microencapsulated Cell Extrusion

journal · 2018

View source

Questions About This Research

What does the research say about 3d printed microneedles maintain cell viability in hydrogel extrusion?: When designing devices for delivering sensitive biological materials, consider additive manufacturing techniques like stereolithography for precise control over micro-scale features, and investigate material properties that can be leveraged to enhance delivery efficiency. Evidence: Scholar Commons (2018).
Why does "3D Printed Microneedles Maintain Cell Viability in Hydrogel Extrusion" matter for design?: This research demonstrates a novel manufacturing approach for delivering therapeutic cells. By utilizing 3D printing for precise microneedle fabrication, designers can create devices that enable controlled extrusion of cell-laden hydrogels, crucial for applications like wound healing and regenerative medicine.
How can designers apply this research?: When designing devices for delivering sensitive biological materials, consider additive manufacturing techniques like stereolithography for precise control over micro-scale features, and investigate material properties that can be leveraged to enhance delivery efficiency.
What were the main findings?: No significant difference in HepG2 cell viability was observed between extruded and control samples at 2h and 24h post-atomization.. Hydrogel bioerosion led to an increase in extrusion yield.. No significant difference in percentage relative payload was found when extrusion occurred at 2h versus 24h post-atomization.
What research method was used?: Experimental, Comparative Analysis.
How strong is the evidence?: Evidence strength is rated Strong effect, based on a 2018 journal from Scholar Commons.
What should I do differently in my next project?: When developing micro-scale delivery systems, explore 3D printing technologies to create custom nozzle geometries and consider the material properties of the payload and the delivery vehicle to optimize yield and viability.
What are the limitations?: The study focused on a specific cell line (HepG2) and alginate hydrogel; results may vary with different cell types or biomaterials. Jetting reliability was reported at 80%, indicating potential for process optimization.