For example for medical disposal, the ultrasonic assembly which is suited for the installation to the catheter is offered. This ultrasonic assembly in order to adjust the ultrasonic focus which is formed by transducer connecting to ultrasonic transducer, includes the adjustment possible ultrasonic focus mechanism which is formed. In order for the ultra wave to be reflected substantially in the boundary, ultrasonic focus mechanism includes the fluid focus lens which at least has two which is separated by the boundary fluids. When voltage is impressed in the electrode, in order boundary form, for example to make the adjustment of curvature of the boundary possible, two electrodes connecting with the fluid focus lens at least, it is constituted. In desirable execution form, this electrode is formed not only radial in order to make the adjustment of the fluid focus lens possible, in rise direction. The bundle it is possible the ultra wave, with the annular ring in the simple execution form which has the symmetry of rotation geometry which has the transducer which is arranged on the center of the fluid focus lens, to be done. This, for example excision characteristic of human body organization or disposal of solidification characteristic necrosis, for example is suitable for atrial fibrillation disposal. With a certain execution form, as for this assembly, it has the adjustment possible fluid focus lens compartment individually the large number which makes more detailed control of ultrasonic focus pattern possible separates.例えば医療処置のため、カテーテルへの取り付けに適した超音波アセンブリが提供される。この超音波アセンブリは、トランスデューサにより生成される超音波の焦点を調整するため超音波トランスデューサに接続して構成される調整可能な超音波焦点機構を含む。超音波が界面で実質的に反射されるよう、超音波焦点機構は、界面により分離される少なくとも2つの流体を持つ流体焦点レンズを含む。電圧が電極に印加されるとき界面形状、例えば界面の曲率の調整を可能にするよう、少なくとも2つの電極が流体焦点レンズと接続して構成される。好ましい実施形態において、この電極は、半径方向だけでなく上昇方向において流体焦点レンズの調整を可能にするよう構成される。流体焦点レンズの中央に配置されるトランスデューサを備える回転対称なジオメトリを持つ簡単な実施形態において、超音波は、環状リングで焦束されることができる。これは、例えば人体組織の切除性又は凝固性の壊死の処置、例えば心房細動処置に適している。ある実施形態では、このアセンブリは、超音波焦点パター
