Patent ID: 11864790
Assignee: UMC UTRECHT HOLDING B.V.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 16:
17. The device according to claim 1, wherein at least one electro-acoustical element comprises at least one microelectromechanical system (MEMS), the MEMS comprising at least one piezoelectric element, a cavity, and one or more of an ultrasound absorbing layer, a quarter lambda reflecting (multi)layer, and an ultrasound reflecting layer, wherein the MEMS comprises a stack of layers, the stack comprising
(i) at least two piezoelectric elements poled in a same direction, each piezoelectric element comprising
a top electrode layer,
a piezoelectric layer, and
a bottom electrode layer, wherein the top electrode covers the piezoelectric layer completely or partially, and wherein the piezoelectric layer covers the bottom electrode completely or partially.