(19)
(11) EP 0 328 351 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
31.07.1991 Bulletin 1991/31

(43) Date of publication A2:
16.08.1989 Bulletin 1989/33

(21) Application number: 89301178.3

(22) Date of filing: 08.02.1989
(51) International Patent Classification (IPC)4: B06B 1/06
(84) Designated Contracting States:
AT BE CH DE ES FR GB GR IT LI LU NL SE

(30) Priority: 09.02.1988 US 154162

(71) Applicant: METTLER ELECTRONICS CORPORATION
Anaheim California 92805 (US)

(72) Inventors:
  • Houghton, Richard Burdette
    Irvine California 92715 (US)
  • Buelna, Terrence Jerome
    Costa Mesa California 92696 (US)

(74) Representative: Enskat, Michael Antony Frank et al
Saunders & Dolleymore 9, Rickmansworth Road
Watford Hertfordshire WD1 7HE
Watford Hertfordshire WD1 7HE (GB)


(56) References cited: : 
   
       


    (54) A therapeutic applicator for ultrasound


    (57) In a therapeutic applicator for the administration of ultrasound a piezoelectric crystal (56) is connectable through a conventional three-wave washer (53) to an electrical power source. The washer (53) is sandwiched between the crystal (56) and a circuit board (46) to which it is attached at one spot on its side towards the board (46). The convolutions on the opposite side of the washer (53) define a plurality of radially equispaced zones for electrical contact with an electrode on the crystal. The contacts are displacable radially outwardly with respect to the point of attachment under dynamic load. A simple but effective and consistent electrical connection is established for an applicator which is easy to assemble.







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