ESWL - Extracorporeal Shockwave Lithotripsy
Extracorporeal Shockwave Lithotripsy is the most common treatment used for kidney stones, ureteral stones and bladder stones. In this treatment, pressure waves are generated externally to the body which are then applied from outside to the patient using a sonic head and focused through the skin and tissue onto the stone. This can then be fragmented into sand-like particles. After this stage, the stone can easily be excreted in the urine.
Piezoelements are configured in a spherical cup where they are driven by a short-term, high-voltage pulse to expand spontaneously and synchronously in the micrometer range and generate a shock pulse. The piezo elements are precisely aligned for the therapy focus. Precise focusing of the pulse forms shockwaves in the treatment focus.
The piezo shockwave from Richard Wolf is currently the only shockwave to use direct focusing and does not require an additional reflector. This technology is based on the compact and ergonomic design of the therapy source and provides a precise, well-defined focus zone. It is quiet, low-noise and generates a high sound pressure in focus.
The focus size for stone disintegration must meet various requirements. On the one hand, it must be defined to be small and compact, in order to protect the surrounding tissue and also to effectively fragment hard stones. On the other hand, a larger focal zone is required to fragment large stones or stone fragments. A larger therapy focus is also frequently required due to the cyclical position changes of the stone caused by breathing movement.
In order to provide users with individual scope for action, the PiezoLith 3000Plus is unique in the world by giving a choice of three different focal zones. The operator can toggle between different zones even during a treatment. This unique versatility is facilitated in the generation of the piezoelectric shockwave. Energy input over a large surface reduces the energy density at the surface of the skin and substantially reduces the pain response. The precise focus zone provides a targeted treatment and affords maximum protection for the surrounding tissue.
Location and positioning
The location and positioning procedure is carried out with the assistance of ultrasound or X-rays. The new Wolf Lithoarm allows the therapy source of the new PiezoLith 3000Plus treatment system to be adapted to a wide range of different X-ray machines so that the mobility of the X-ray C-arc and the modularity of the individual components of the lithotripsy system are retained.