EP 0173864 B1 19890726 - POROUS MATCHING LAYER IN AN ULTRASONIC APPLICATOR
Title (en)
POROUS MATCHING LAYER IN AN ULTRASONIC APPLICATOR
Publication
Application
Priority
DE 3430161 A 19840816
Abstract (en)
[origin: US4686409A] A material is disclosed for use as an adaptation layer in ultrasonic transducer units of the type which have a piezo-ceramic transducer. The material is porous, and the acoustic impedance of the material can be adjusted (in one embodiment, to 12x106 kg/cm2s) by adjusting the porosity of the material. In preferred embodiments, the material is piezo-electric and may have a porosity gradient.
IPC 1-7
IPC 8 full level
A61B 8/00 (2006.01); G10K 11/02 (2006.01); H04R 1/22 (2006.01); H04R 17/00 (2006.01)
CPC (source: EP US)
G10K 11/02 (2013.01 - EP US)
Designated contracting state (EPC)
AT DE FR GB NL
DOCDB simple family (publication)
EP 0173864 A1 19860312; EP 0173864 B1 19890726; AT E45054 T1 19890815; DE 3430161 A1 19860227; DE 3571887 D1 19890831; JP H0644837 B2 19940608; JP S6153899 A 19860317; US 4686409 A 19870811
DOCDB simple family (application)
EP 85109705 A 19850802; AT 85109705 T 19850802; DE 3430161 A 19840816; DE 3571887 T 19850802; JP 17746785 A 19850812; US 75955985 A 19850726