Improved transcutaneous signal coils for detecting two-dimensional dislocation

Transcutaneous power-transmission coils continuously transmit electric powe r into implanted devices, such as FES (Functional Electrical stimulation), implanted artificial hearts and so on. For a transcutaneous power-transmiss ion system, a transcutaneous signal-transmission coil is required to monito r and control the implanted devises. However, in the event that transcutane ous power-transmission coils are dislocated, power-transmission decreases. It is therefore necessary to determine how they are dislocated for monitori ng the state of power transmission, in this paper, we study a system to det ermine the dislocation of coils by measuring the current value of the signa l coil outside the body. The dislocations and the shift direction of the co ils can be evaluated within about+/-15[mm]. We can determine each dislocati ons of an X and Y direction independently by using a figure of # coil.