Wireless charging device through skin in use for implantation type medical treatment instrument

Abstract

The invention is related to embedding type technical area of medical treatment instrument. Characters are that the instrument includes receiving coil embedded inside human body, charging control circuit, rechargeable battery, and transmitter coil located outside human body, and drive circuit for transmitter coil. The transmitter coil outside human body is in larger size in flat shape. Receiving coil inside human body is in smaller size in column form. Both coils contain magnetic core. Electromagnetic coupling mode parallel to axes is adopted in the invention. Under excitation of drive circuit, the transmitter coil transmits electromagnetic energy. Obtaining energy, the receiving coil charges the rechargeable battery through the charging control circuit. Through skin, even case made from titanium, the method is capable of charging medical instrument. Features are: good positioning tolerance easy of adjustment, simple and reliable charging procedure.

Description

technical field [0001] The invention relates to a percutaneous wireless charging device for implantable medical instruments, belonging to the technical field of implantable medical instruments. Background technique [0002] There are many types of implantable medical devices, and their applications are also very wide, such as cardiac pacemakers and defibrillators, brain pacemakers, spinal cord stimulators, peripheral nerve stimulators (including vagus nerve stimulators, sacral nerve stimulators, phrenic nerve stimulators, etc.), muscle stimulators, cochlear implants, etc. [0003] All kinds of implantable medical devices are generally expensive, but most of them have a short lifespan. The main factor limiting the life of implantable medical instruments is the capacity of the battery. Most of the existing implantable medical instruments are powered by lithium primary batteries with high energy density, such as lithium-chlorine sulfite batteries and lithium-polyfluorocarbons....

AI Technical Summary

Problems solved by technology

[0005] However, in order to prevent the body fluid from infiltrating into the instrument during long-term use, resulting in short circuit and corrosion of components, implantable medical instruments are generally sealed with biocompatible titanium metal into a smooth shape, which forms a strong electromagnetic field on the one hand. Shielding, on the other hand, makes it impossible to accurately locate the coils and circuits inside the titanium shell implanted in the body outside the body, so the existing technology is difficult to use

The Chinese invention patent "A device for providing energy for electronic equipment" (application number 200410009052.1) provides a wireless charging solution, but requires the receiving coil of the charging circuit to be inserted into the transmitting coil in a coaxial manner. cannot be achieved in

The wireless charging scheme given in the Chinese invention patent "Rechargeable Deep Brain Stimulator" (application number 200410019937.X) is based on the traditional transformer method, and the transmitting coil and receiving coil are respectively wound on a "U"-shaped magnetic core of the same size , it is required to align the magnetic cores of the two coils to achieve electromagnetic coupling. However, the receiving coil is packaged inside the implantable medical device, and its accurate positioning is very difficult. The magnetic cores of the transmitting coil and the receiving coil are prone to radial deviation , which leads to a great reduction in energy transmission efficiency, and the stability of charging cannot be guaranteed; in addition, the U-shaped magnetic core requires a large core height, which is difficult to be practically applied to implantable medical devices that pursue lightness and miniaturization

The use of rechargeable batteries to supply energy for implanted medical devices has been applied abroad, but the technical scheme is not disclosed

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