Low-Energy Ultrasound, Electrical and Magnetic Field Stimulation in Therapy-Resistant Myofascial Pain Syndrome

Inclusion Criteria: * Male or female aged 18 to 99 years at screening * Patient has an understanding of the study and its procedures, agrees to its provisions, and gives written informed consent prior to any study-related procedures * Patient is suffering from one of the following chronic pain conditions originating from myofascial pain: * low back pain * tension headache * neck pain having been persisting for a minimum of 3 months and where myofascial pain syndrome is the pre-dominant cause for pain. * Patient is constant with respect to pain treatment for 1 week during the screening phase * A daily average NRS \>= 4 on 4 out of 7 days in the screening phase * Compliance with the daily status reporting requirements as demonstrated Exclusion Criteria: * Patients with active implants * Allergy against rescue medication used during the study * Pregnancy * Mental or physical impairments that represent a source of risk for handling the device * Patients with cerebral spams (epilepsy) * Patients with psychiatric diseases or somatoform pain disorders * Patients with oral morphine equivalent of more than 120mg daily dose * Patients taking centrally acting muscle relaxants like Sirdalud or benzodiacepines * Patients with a contraindication against NSAID's * Presence of artificial joints made from methylmethacrylate or polyethylene at stimulation site * Presence of ferromagnetic metal implants at stimulation site, especially aneurysm clips, dental implants, etc.