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Device for measuring relative jaw positions and movements

  • US 4,673,352 A
  • Filed: 01/02/1986
  • Issued: 06/16/1987
  • Est. Priority Date: 01/10/1985
  • Status: Expired due to Term
First Claim
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1. Apparatus for measuring the positions and movements of the lower jaw relative to the upper jaw,comprising a rigid first holder to be secured in a fixed relationship to the upper jaw to the patient'"'"'s head, a rigid second holder to be secured to the lower jaw and a plurality of distance measuring devices including a respective transmitter and receiver which are provided at the holders to determine the positions of the holders relative to each other,wherein at one of said first and second holders, there are fixed at least three successively activatable transmitters for ultrasonic signals,at the other holder there are mounted at least three receivers for ultrasonic signals, means for activating the transmitters in succession with intervals therebetween that are longer than the maximum transit time of the ultrasonic signals between a transmitter and a receiver, and each of said at least three receivers having means for receiving the ultrasonic signals of all the transmitters of the one holder, whereby a distance value between a transmitter and each of the receivers can be determined for each of the transmitters.

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