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EP0454188A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Switching circuit in a dental handpiece

Assignee: Dentsply Sirona Inc
•
Filing: 1988-03-28
•
Granted: —
•
Expires: 2008-03-28
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Abstract

Abstract A single handpiece that can be used in multiple dental treatments is provided. The handpiece comprises a housing having a coil for producing an electromagnetic or electrostrictive field in the housing, and a number of inserts that react with the electromagnetic or electrostrictive field and can be used with the housing to complete the handpiece. A switching system used with the handpiece, which electrically recognizes the particular insert used with the housing provide for automatically controlling circuitry that determines which of a number of materials and medicaments are to be delivered to the handpiece for use with a particular insert. Circuitry which provides better control of the ultrasonic insert in the handpiece is also provided.

Inventors

  • 👤 George E. Warrin
  • 👤 Rene J. Perdreaux
  • 👤 Richard H. Paschke
  • 👤 Teodor E. Constantinescu
  • 👤 Robert Mcgill

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-03 11:39
CPC Classifications
A; A61; A61C; A61C3/00; A61C3/02; A61C3/025; A61C17/00; A61C17/16; A61C17/20

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 66 words
A switching circuit for selecting a driving circuit comprising: (a) at least one drive coil for establishing an alternating electromagnetic field, and at least one feedback coil wherein said switching circuit has a voltage dependant on the nature of an insert placed within the windings of said drive coil, and feedback coil and (b) a logic circuit adapted to detect different voltages in said switching circuit.
Claim 2
Dependent Claim 41 words
The switching circuit according to Claim 1 in which said logic circuit comprises a buffer, a voltage comparator, a frequency discriminator and a logic array wherein input in said logic array determines which circuits will be activated by said logic array.
Claim 3
Dependent Claim 35 words
A circuit for fine-tuning mechanical output in a magnetostrictive or electrostrictive apparatus comprising a feedback system which measures mechanical output and feeds said measurements to driving circuitry that controls the power input to said apparatus.

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