Ring Finger Splint for Hirayama Disease

This is a lightweight, low-profile finger splint designed to help keep the ring finger in a straight, supported position, created specifically to assist with Hirayama disease–related finger weakness. The design focuses on comfort, simplicity, and everyday wearability while still providing gentle positional support.

Two versions are included:

• Fixed-size (closed loop) -- more compact, rigid, and mechanically stable
• Adjustable (slotted loop) -- allows slight expansion for easier fit and comfort

How to Scale for Your Finger

1. Measure your finger circumference at the knuckle
2. Compute your finger diameter:
   Diameter = Circumference / π
3. Compute scaling factor:
   Scale = (Your Diameter / Reference Diameter) × 100% 
   1. Reference Diameter for this model = 19.25 mm
   2. Scale = Finger Circumference * 1.65
4. Apply this as uniform scaling in your slicer

Advanced Customization

For precise fitting or geometry changes:

• Download the included STEP file
• Modify dimensions directly in the Parameter Table
• Export as .STP or .STL