A therapeutic apparatus for treating body tissue comprises a vessel enclosing a detonation chamber into which a detonatable mixture is introduced and then detonated using an igniter to form at least one shockwave and/or acoustic wave. A wave guide assembly having a converging geometry directs the wave to a tip of the wave guide assembly that is placed in contact with tissue to be treated by the wave. The wave guide assembly may include a wave focusing section surrounding the vessel, a flexible conduit connected to the wave focusing section and a needle connected to the conduit and sized for insertion into patient tissue to be treated. A cap connected to the end of the needle is formed from material permitting the wave or waves generated in the detonation chamber to pass therethrough to treat the patient tissue into which the needle is inserted.
