چكيده به لاتين
According to the great improvement in technology, changes have been taking place in medical devices for the control and treatment of diseases. One of these great progress is in the field of nerve and brain stimulators, which have different types. In this study, we investigated the Vagus Nerve Stimulation, which is implanted in the chest area and controls epilepsy by sending a pulse during the seizure. This stimulator consists of three parts: a pulse generator, a lead and a probe or lead tip, and its operation is based on nerve stimulation.
Our purpose in this study is to investigate the effect of external waves on VNS performance. For example, people who have an Implanted Medical Device (IMD) in their body, when talking on a cell phone, as the cell phone receives the signal, so does the power sent to the implanted device. On the other hand, these patients can’t be exposed to magnetic environments. For example, they can’t use Magnetic Resonance Imaging (MRI). Due to induced voltages and fields created in the human body and in the implanted leads, these devices may move in body and pose a risk of death. Therefore, in order not to disrupt the function of these stimulators, we must reduce the effect of external waves. Thus, we consider methods based on transmission line theory to reduce this coupling.
First, we model a neurostimulator exposed to external fields, consisting of a pulse generator, lead, and probe, by transmission line theory. Then we examine the induction due to exposure of the nerve stimulator to waves with different frequencies. Finally, we present methods based on transmission line theory to reduce the coupling caused by external waves on the VNS by changing the structure of the nerve stimulator's lead, which is modelled as a coaxial cable.
