Periodontal probe instrument

Details Periodontal probe instrument Periodontal probe instrument

1989-01-17

1990-02-27

Wilson, John J.

Dentistry

Apparatus

Having gauge or guide

128776, A61C 1904

Patent

active

049041843

ABSTRACT:
A periodontal probe instrument for measuring the depth of a periodontal pocket in the gingiva adjacent a tooth includes a probe handle member in which a displacement sensor and a probe element are mounted. The probe element includes an external end and is disposed adjacent and parallel to the displacement sensor. A tip of the displacement sensor is aligned with the external end of the probe element in a first reference position. A pressure transducer is mounted in the handle member for generating a first output signal indicative of the magnitude of the force applied. A displacement transducer is mounted in the handle member for constantly encoding the displacement of the tip of the displacement sensor as it is moved from the first position to a second position to generate a second output signal indicative of the depth of the periodontal pocket. A comparator circuit is provided for generating a logic signal only when the first output signal is in the range between a low threshold signal and a high threshold signal. An indicator is responsive to the logic signal to produce an indication to generate an actuation signal. In response to the indication to generate an actuation signal, a switch is operated to cause a computer to read the second output signal indicative of the depth of the periodontal pocket.

REFERENCES:
patent: 3058225 (1962-10-01), Ward
patent: 3943914 (1976-03-01), Grenfell et al.
patent: 4203223 (1980-05-01), Lautenschlager et al.
patent: 4340069 (1982-07-01), Yeaple
patent: 4665621 (1987-05-01), Ackerman et al.
patent: 4677756 (1987-07-01), Simon et al.
patent: 4764114 (1988-08-01), Jeffcoat et al.
patent: 4791940 (1988-12-01), Hirschfeld et al.

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