Patent · US Expired

Electrical pulp testing instrument

US4197641A · kind A · utility

6Cited by

8References

4Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Monika Paulke · Fairview Avenue, DE
Eugen Hohmann · Bensheim, DE
Bernd Nickel · Karlsruhe, DE

Key dates

Filing date	Mar 20, 1978
Grant date	Apr 15, 1980
Priority date	—
Expiry date	Mar 20, 1998

Classification

Technology area (CPC A)Human Necessities
CPC primaryA61C19/06
WIPO fieldMedical technology
WIPO sectorInstruments

Abstract

A hand-held instrument is illustrated wherein a counting cycle may be initiated by pressing the active electrode against a tooth to be examined. A digital to analog converter controls a battery operated current source to supply stimulating current pulses whose intensity is linearly increased in steps at the counting rate, independently of the electrical resistance presented by the external current flow path. The counter controls an indicator which displays the successive output current values, and displays the last reading for a predetermined time interval at the end of the counting cycle.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.