Getting Started: Fitment

Achieving the correct fit is crucial for optimal comfort and functionality of your prosthetic finger. Follow these steps carefully to ensure a secure and effective fit:

1. Selecting the Correct Ring Size

1. Measure and Select:

   • Based on your provided measurements, you will receive three ring sizes and two spacer inserts to fine-tune the fit.

   • The goal is to achieve a sliding fit with minimal resistance — the ring should not be too tight or too loose.

2. Fit Considerations:

   • If your residual limb is shorter, opting for a tighter-fitting ring may help capture a better range of motion.

   • For the best control, select a ring that sits securely without discomfort.

2. Positioning the Ring on the Residual Limb

1. Slide and Adjust:

   • Position the ring toward the end of the residual limb — as far away from the base of the finger as possible. To adjust:

     • Unscrew the screw on the ring.

     • Slide the ring along the linkage to the desired position.

     • Tighten the screw securely in the final position.

2. Check for Movement:

   • Minor play in the ring is acceptable after tightening.

   • If the ring becomes loose over time, apply a small amount of temporary Loctite to the screw for a more secure hold.

3. Adjusting the Palm Backplate

1. Positioning:

   • The palm backplate, where the prosthetic finger is mounted, can be repositioned for comfort and function.

   • Adjust the backplate’s position and secure it using the Velcro strap.

2. Wearing the Strap:

   • The strap should sit at the base of the hand, similar to a traditional watch strap.

   • Ensure that the strap does not interfere with wrist movement.

3. Joint Alignment:

   • Make sure the hinge joint of the linkages aligns directly over your anatomical knuckle joint.

   • Proper alignment is key to achieving natural movement and full range of motion.

4. Testing the Fit

1. Try It On:

   • After selecting the ring and positioning the backplate, put on the device.

   • Flex and extend both your wrists and fingers.

2. Check for Comfort and Performance:

   • If you feel discomfort, reassess the ring size, ring position, and backplate position.

3. Clearance Check:

   • Under full extension, there should be a small gap between the end of your residual limb and the front components.

   • The linkages should not be touching the residual limb.

5. Troubleshooting

Limited range of motion
- Remove the spacer insert.
- Use a larger ring size.

Difficulty actuating the mechanism
- Add a spacer insert.
- Use a smaller ring size.

Palm backplate rises too much during bending
- Remove the spacer insert.
- Use a larger ring size.
* Some movement of the backplate is normal.

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You'll be able to achieve a secure and functional fit by carefully selecting and adjusting the ring and backplate, ensuring smooth operation and maximum comfort in daily use.