As with dr echt 's design , power constraints mean that this approach can be used only for pacing .
与drecht设计一样，携带电量有限，这种方法只能用于调节心律。
It is similar to dr echt 's leadless pacemaker , but it uses electromagnetic induction , rather than ultrasound , to stimulate a small implanted receiver , which in turn stimulates the heart .
