Ultrasound coupling device for histotripsy systems and methods

An ultrasound coupling system, comprising:

• a coupling container including one or more attachment features;
• a coupling membrane coupled to coupling container, the coupling container and coupling membrane forming leak-proof fluidic seal, the coupling membrane being configured to expand to conform to a patient when the coupling container and coupling membrane are filled with an ultrasound coupling medium;
• and
• a porous constraint device being configured to attach to the attachment features of the coupling container, the porous constraint device limiting expansion of the coupling membrane.