Keyboard Typing Aid, Fingertip Type —TA-03

For (With Whom)

People with upper limb impairments due to cervical spinal cord injury, etc.

Why

This keyboard typing aid was made in response to requests from people whose fingers are bent and cannot be extended, or who cannot apply enough force to press keys when typing, who wanted keyboard and smartphone operation to be easier.

How

A self-help device in the shape of an elliptical tube with a closed tip was made so that a finger can be inserted. A gentle curve lets it be worn in a natural state without forcing the finger straight. Because finger thickness varies greatly between individuals, three sizes were set: S, M, and L. The main body above can be inserted up to just before the PIP joint, but using it together with a guide part positioned between the PIP joint and the MP joint strengthens the assistive force and prevents it from falling off. Guide parts are available in sizes 1 to 4 to accommodate finger thickness (1 is the smallest size). A soft urethane cushion is attached to the tip of the main body to reduce slipping. Also, by tapping a thread into the tip and attaching a replacement stylus pen tip, smartphones and the like can be operated. In that case, sensitivity is better if the replacement pen tip is in contact with the body, so some ingenuity is needed.

Outcome

It was effective for people who operate a keyboard or smartphone with one finger and whose fingers are bent or who cannot apply enough pressing force.

Materials Used

ABS

Approximate 3D Print Weight

Finger part, each size: 3g, Fingertip part-S: 10g, Fingertip part-M: 11g, Fingertip part-L: 13g

Print Settings Overview

Main body: Nozzle diameter =0.4mm , Layer height=0.2mm, Infill=50% , Temp=240°C , Speed = 40mm/s, Support=Yes

Accessory Information

A hemispherical soft urethane cushion is attached to the tip. For smartphone use, attach a replacement stylus pen tip.