Acoustic lens and applications thereof
The disclosed embodiments relate to a portable ultrasound device. Specifically, the disclosed embodiments relate to an acoustic lens positioned at an ultrasound probe. The acoustic lens may be configured for impedance matching and signal attenuation. In one embodiment, ultrasound signal attenuation is provided by forming an acoustic lens as a solid admixture of signal attenuating particles in a polymer matrix.
1. An ultrasound apparatus, comprising:
an ultrasound transducer array; and
an acoustic lens disposed over a first surface of the ultrasound transducer array,
wherein the acoustic lens comprises an inner layer, the inner layer comprising a solid mixture of room-temperature vulcanized (RTV) polymer and block polymer, and
wherein the acoustic lens is configured to provide signal attenuation and impedance matching.
2. The ultrasound apparatus of claim 1 , wherein the acoustic lens comprises RTV 630.
3. The ultrasound apparatus of claim 1 , wherein the block polymer is one or more of a thermoplastic material or a block-copolymer.
4. The ultrasound apparatus of claim 3 , wherein the solid mixture comprises RTV particles dispersed in a block co-polymer.
5. The ultrasound apparatus of claim 4 , wherein the RTV particles are about 100 microns or less in size.
6. The ultrasound apparatus of claim 5 , wherein the solid mixture of RTV polymer comprises one or more of RTV 615 or RTV 630.
7. The ultrasound apparatus of claim 1 , wherein the solid mixture of RTV polymer and block polymer further comprises a filler.
8. The ultrasound apparatus of claim 7 , wherein the filler is one or more of Al 2 O 3 or graphite.
9. The ultrasound apparatus of claim 1 , wherein:
the acoustic lens comprises an outer layer; and
the acoustic lens outer layer comprises a room-temperature vulcanized (RTV) polymer.
10. The ultrasound apparatus of claim 1 , further comprising a heat sink disposed over a second surface of the transducer array.
11. The ultrasound apparatus of claim 10 , wherein the heat sink comprises a plurality of tabs.
12. The ultrasound apparatus of claim 11 , further comprising a circuit board disposed between the plurality of tabs.
13. The ultrasound apparatus of claim 10 , wherein:
the acoustic lens comprises an inner layer; and
the ultrasound apparatus further comprises a tungsten-epoxy layer interposed between the heat sink and the inner layer of the acoustic lens.
14. The ultrasound apparatus of claim 13 , wherein the tungsten-epoxy layer is integrated into the heat sink.
15. The ultrasound apparatus of claim 1 , wherein the acoustic lens comprises a plurality of signal-attenuating particles in a polymer matrix.
16. The ultrasound apparatus of claim 15 , wherein the signal-attenuating particles comprise PEBAX.
17. The ultrasound apparatus of claim 15 , wherein the polymer matrix comprises a room-temperature vulcanized (RTV) polymer.
18. The ultrasound apparatus of claim 15 , wherein the polymer matrix further comprises one or more of Al 2 O 3 or graphite.
19. The ultrasound apparatus of claim 1 , wherein an outer surface of the acoustic lens is configured to receive an ultrasound gel pad.
20. The ultrasound apparatus of claim 19 , wherein the outer surface of the acoustic lens comprises one or more retaining prongs configured to receive and maintain the ultrasound gel pad adjacent to the outer surface of the acoustic lens.