Patent ID: 7695443

Claim:
A therapy head for treatment with shock waves into which is inserted device (V) for generating acoustic shock waves for medical therapy when an applied voltage of 10 KV to about 30 KV is applied to generate a spark discharge the therapy head comprising a housing having a reflector (R) which is formed having a cavity that has an open side in the distal direction; a closure cap (D) made from a material for coupling the shock waves into the body part to be treated, the closure cap (D) closes the open side of the reflector sealing the cavity; and wherein the device (V) is inserted into a recess on a proximal side of the housing, the device (V) having two electrodes of a spark discharge section extending into the cavity, which generates a spark discharge under exposure to 10 KV to 30 KV at on or near a focus of the reflector wherein the cavity is filled with a liquid medium, and wherein the liquid medium comprises a colloidal particle suspension of a conducting, semiconducting, or polarizable substance of aluminum particles in water which reduces the latency time of the shock wave generation wherein the aluminum particles are of a size of 1 nanometer to 1 micron to prevent falling of the particles in a gravitational field thereby maintaining a portion of the colloidal particle suspension between the two electrodes.