Design Refinement Discussion: Boston Area Community Fitting Initiative

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Design Refinement Collaboration Request — Boston Area Community Prosthetic Fitting Initiative

We are coordinating a community-based prosthetic fitting initiative in the Boston/Cambridge/Somerville, MA area and would like to open a collaborative design refinement discussion to align our open-source efforts.

Background

Our community initiative focuses on improving prosthetic fitting accessibility in the greater Boston area. Our volunteers include engineers, designers, healthcare providers, and amputee community members. We are building on existing open-source projects (including OpenBionics) to refine designs for local fitting events.

Key Design Refinement Topics for Discussion

1. Parametric Sizing & Personalization

   • How can we improve the parametric CAD models to accommodate a wider range of residual limb geometries?
   • Integration of 3D scan-based fitting workflows into the design pipeline.

2. Printability & Material Optimization

   • FDM vs. SLS vs. SLA trade-offs for community-level fabrication
   • Cost reduction through material substitution without sacrificing durability
   • Multi-material printing strategies for flexible/rigid zones

3. Mechanical Refinements

   • Differential mechanism improvements for more intuitive control
   • Grip force calibration for varying user strength levels
   • Modular component design for easier repair and replacement

4. Electronics & Control

   • EMG signal processing pipeline improvements
   • Affordable microcontroller options for community builders
   • Haptic/sensory feedback integration

5. Fitting Workflow Design

   • Step-by-step fitting guides for volunteer teams
   • Standardized measurement protocols
   • Follow-up adjustment tooling

Proposed Next Steps

• Schedule a virtual design review meeting (proposed: bi-weekly)
• Create a shared design decision log for tracking refinements
• Identify 2-3 priority design improvements for the next fitting event
• Cross-reference community feedback with clinical trial insights

Related Clinical Trial Landscape (as of 2025)

Based on our analysis of ClinicalTrials.gov data, there are 2,179 prosthetic-related clinical trials globally. The most active sponsor category is Other (1,673 / 77%) — primarily academic/community sponsors — which aligns well with our open-source model. Key phase activity:

• Phase 1: 35 trials
• Phase 2: 78 trials
• Phase 3: 70 trials
• Phase 4: 91 trials
• Active/Recruiting: ~490 trials

This suggests growing clinical validation of prosthetic technologies, which strengthens the case for community-driven open-source design improvements.

Questions for the Community

• What design features would most improve user comfort and daily function?
• Are there specific clinical findings from recent trials that should inform our design priorities?
• Are there Boston-area volunteers interested in contributing design or fitting expertise?

We welcome all perspectives. Please share your thoughts below.