Automated Allergy Patch Test Preparation Machine

University of Alberta — Capstone Design Project (Group XV Engineering)

Problem

The John Elliott Professional Corporation (JEPC) needed a machine to automate the preparation of 4×10 cell low-density polyethylene (LDPE) allergy patches. Each patch required allergens, supplied in 5 mL syringes, to be dispensed into individual cells in 30–45 μL quantities without cross-contamination. The manual process was slow and labor-intensive, requiring more than four minutes per patch.

Approach

• Collaborated as part of XV Engineering (Capstone Group 15) to design a machine that automated patch preparation.

• Designed a multi-step filling process to account for patch geometry, ensuring each cell could be filled in a logical sequence.

• Integrated syringe-based dispensing with motion control to achieve consistent dosing and reduce operator workload.

• Focused on minimizing cross-contamination through careful layout of filling paths and controlled dispensing.

Result

Delivered a prototype machine concept capable of preparing allergy patches within the four-minute per patch target, while improving accuracy and reducing the burden on clinical staff. The project demonstrated how automation can increase throughput and reliability in clinical workflows.

Poster

Report

Presentation