High tech dental:

Elimination of large x-ray machines by using a grooved ball slid over a tooth to get a CAd-scan

something like this

the tube contains
miniaturized devices for radiating x-rays, ultrasound, heat and other electromagnetic spectra, and
sensors for he absorption of the radiation,
and onboard or separate pluggable processor unit for determining absorption of the radiation, and imaging on a display

High-Tech pen ideas:

mechanical-fluid twist-controlled mechanism
onboard microcomputer elelemnt conformal to the body of the pen
Light powered lumiactive battery conformal to the body of the pen

Non-strip threads
metal-lattice polymer sleeve with elastic memory for adapting to the owner's grip 
ink delivery in alternate ball-point/fountain pen modes

signalling:
Signature/writing memory and verification of user
Replace Cap alarm beep
New user (writing detection) alarm/beep
Illumination assist glow light