Wireless charging optimal power self-searching system for implantable medical device

Abstract

The invention discloses an optimal power self-searching system for wireless charging of an implantable medical device. The optimal power self-searching system comprises an optimal power searching unit, a link power calculation unit, a power self-adaptive processing unit and an optimal antenna selection unit. The optimal transmission path is found through the optimal power, the power self-adaptive processing unit dynamically calculates index parameters in the charging period in the whole process, the duty ratio of a wireless charging driving signal is adjusted in a self-adaptive mode, the transmitting power is adjusted, the charging efficiency is ensured, and meanwhile the eddy current heating temperature rise is reduced. According to the invention, the antenna alignment and charging efficiency during the in-vitro wireless charging period of the implantable medical device is effectively improved, the eddy current heating temperature rise is reduced, and the user experience is improved.

Description

technical field [0001] The invention belongs to the field of nerve stimulation, and relates to an implantable medical device wireless charging optimal power self-seeking system. Background technique [0002] With the advancement of technology and society, people have also put forward new requirements for charging methods. Wireless charging, as the name implies, is to use air or other tissues as the medium to realize electric energy transmission without any metal wires or other physical connections. Charge the device. At this stage, there are three main implementation methods of wireless charging technology. The first is the electromagnetic induction method that uses the changing current to generate a magnetic field through the coil to realize the power transmission; the second is the electromagnetic resonance method that uses the electromagnetic coupling resonance effect; the third is the electric power Electromagnetic wave radiation that radiates to the receiving end in th...

AI Technical Summary

Problems solved by technology

[0007] According to the electromagnetic field theory, the metal sealed cavity has natural shielding properties for electromagnetic signals. In the field of implantable medical devices, wireless charging is inevitably attenuated by metal shielding and eddy current heating. Thermal damage requires special design and protection

At the same time, after implanted in the human body, the implantable medical device is usually embedded in the subcutaneous fascia layer, with a depth of no more than 2cm. The implanted medical device will eventually form a capsule under the wrapping of muscle, fat and skin. Under the assisted positioning of inspection methods, the structural outline of the implantable medical device can only be found through "touch" or "patient memory", and then "estimate" the placement of the charging coil, so as to realize the internal / external antenna alignment. Alignment, and during wireless charging, a slight movement of the external coil will have a greater impact on charging efficiency

Images