An ultrasonic medical device includes a first ultrasonic transmitter, emitting a first ultrasonic with frequency f1, and a second ultrasonic transmitter, emitting a second ultrasonic with frequency f2. The wave paths of these ultrasonics overlap at least a portion of each other in one medical treatment area, forming a first resultant ultrasonic with frequency f3 at the medical treatment area. Both f1 and f2 are larger than f3. The resultant ultrasonic can be used in medical treatment.一種超音波醫療器材,包含一第一超音波發射源,此超音波發射源發出一頻率f1之第一超音波;及一第二超音波發射源,此超音波發射源發出一頻率f2之第二超音波。其中,這些超音波之行徑路徑至少部分彼此交錯以形成一醫療作用區,並在該醫療作用區中形成一頻率f3之第一合成超音波,且f1,f2>f3。以利用此合成超音波達到醫療效果。310‧‧‧第一超音波發射源312‧‧‧第一超音波320‧‧‧第二超音波發射源322‧‧‧第二超音波330‧‧‧第一合成超音波334‧‧‧醫療作用區350‧‧‧患部390‧‧‧音波傳導物質
