Finger Side-Support Splint (DIP joint)

This is a low-profile splint designed to limit side-to-side bending of the top finger joint (radial or ulnar deviation of the distal interphalangeal joint), which often is felt as pain at the joint when holding a heavy object in such a way that it is pulling the fingertip to the side. Injuries to the collateral ligaments at this joint don’t require large or bulky supports, what you need is stabilization above and below the joint with rigidity on the injured side.

This design provides targeted lateral support in a minimal form, revised many times resulting in a splint that minimally disrupts typing and stays comfortable on the back of the finger with openings positioned where your joints naturally protrude. It allows partial flexion of the joint, which helps maintain normal hand function and reduces disruption to everyday tasks.  Because of this it may work well for other minor joint injuries where reduced bending is helpful.

Heat forming:

It’s intended to be printed flat in PLA which makes forming it to your finger easy. Briefly submerging it in hot (near-boiling) water makes the plastic pliable so you can mold it to your finger. You’ll need to shape it fairly quickly as it cools rapidly (and doesn't hurt, I promise!), but it can be reheated and re-formed as many times as needed.  A well-shaped splint will stay in place, although adding a couple thin strips of medical tape (as seen in the photos) gives better support.

A little trick you can try is to shape it to a smaller finger so it fits more tightly on your injured one.

Sizing:

Multiple sizes are included corresponding to common glove sizes. Based on prototyping, they’re fairly accurate, and they can be scaled in the XY plane if needed for a more customized fit.