Knife Attachment for People with Amyotrophic Lateral Sclerosis - DL-12

For (With Whom)

A person with amyotrophic lateral sclerosis (ALS) who cannot grip a kitchen knife because of weak finger strength and uses it by pinching it between the index and middle fingers.

Why

When cooking, the user held the knife handle between the index and middle fingers, and it became unstable when cutting hard foods. The user therefore wanted a way to cook as safely and comfortably as possible.

How

First we observed the actual knife operation and found that there was instability when pushing down with the palm while holding the handle between the index and middle fingers. We therefore made an attachment that widens the contact surface so that the palm can push stably. Until completion, we had the user repeatedly try out how much force is applied when pushing down. Finally, we attached sponge rubber to the part the palm touches to improve the operating feel.

Outcome

Because the palm can now push stably, the user finds it easier to cut hard ingredients. In addition, force can be applied with better overall balance, so fatigue has also decreased.

Materials Used

TPU

Approximate 3D Print Weight

10g

Print Settings Overview

Nozzle diameter = 0.4mm, Layer height = 0.1mm, Infill = 20%, Temp = 220°C, Speed = 30mm/s, Supports = No

Accessory Information

Sponge rubber