Devices and methods were discovered that successfully provided patient
autonomous control of both hyolaryngeal elevation, anterior hyoid motion
and opening of the upper esophageal sphincter for swallowing by
intramuscular stimulation of two muscles. The technology allows patient
self stimulation of swallowing and can return oral feeding to dysphagia
patients. Indwelling electrode stimulation of only two muscles generated
as much as 80 % of normal synergistic movement leading to swallowing. The
devices and methods also are useful for control of other upper
respiratory muscle groups involved in speech and voice. Calibration
techniques may be used in combination for greater freedom in setting and
using electrodes over extended implantation time periods. These methods
and devices can control complex movements of body solids such as bone and
cartilage and tissues by electro stimulation of a minimum set of muscles
simultaneously.