JP2016007230A - Transmission coil for transdermal wireless power transmission system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a soft and flexible transmission coil for a transdermal wireless power transmission system.SOLUTION: There is provided a transmission coil for a transdermal wireless power transmission system in which spiral coils 5 produced by using a flexible printed board are laminated and included into a buck 6 made of a silicon resin. In a basic constitution, the spiral flexible coils produced from a flexible printed board are laminated as many as a required number according to transmission power, and put into the buck made of a silicon resin.

Description

  The present invention relates to a transmission coil for a transcutaneous wireless power transmission system having a new structure.

  The transcutaneous wireless power transmission system uses a coil installed outside the body (external coil) and a coil implanted inside the body (subcutaneous coil) to supply power to an implantable high-performance medical device such as an artificial heart. It is a system that transmits power wirelessly by high-frequency electromagnetic induction. A conventional transmission coil is produced by embedding a core of a multi-core electric wire such as a litz wire in a silicon resin or an epoxy resin, but the coil itself is hard and lacks flexibility. In particular, when the body coil is implanted under the chest, there is a problem that the body wall can be implanted only in a relatively flat portion of the chest wall, such as the upper part of the front chest wall, because the body wall is poorly seated at a portion having a large curvature. In addition, since the coil itself is hard, the skin or subcutaneous tissue sandwiched between the extracorporeal coil and the intracorporeal coil may be compressed by the two coils, causing necrosis.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a soft and flexible transmission coil in order to solve such problems in the conventional transmission coil for a transcutaneous wireless power transmission system.

  The present invention is a transmission coil for a transcutaneous wireless power transmission system in which spiral coils manufactured using a flexible printed circuit board are stacked and sealed in a silicon resin bag, or silicon oil is sealed inside a silicon resin bag The transmission coil for the transcutaneous wireless power transmission system.

  According to the present invention, since a soft and flexible transmission coil can be realized, when the body coil is implanted in the chest, the coil is freely deformed along the curved surface of the chest wall, so that the chest wall is configured by a three-dimensional curved surface. It can be fitted to any of the above parts, and since the flexibility of the coil itself is great, there is an effect that compression necrosis hardly occurs.

1 is a transmission coil schema of a transcutaneous wireless power transmission system. It is a general-view perspective view of the transmission coil for transcutaneous wireless power transmission systems of an Example. It is sectional drawing cut | disconnected by the vertical cross section of the transmission coil for transcutaneous radio | wireless electric power transmission systems of an Example. It is one piece of the coil produced using the flexible printed circuit board which is contained in the silicon resin back | bag of an Example. It is sectional drawing cut | disconnected by the vertical cross section at the time of implanting the transmission coil for transcutaneous radio | wireless electric power transmission systems of an Example in the site | part with a curvature of a body.

  The basic configuration of the present invention is that a spiral flexible coil made of a flexible printed circuit board is laminated in a required number according to the transmission power and placed in a back made of silicon resin. In terms of image, a flexible coil is enclosed in a silicon bag used for breast augmentation surgery. However, in breast augmentation, physiological saline is injected into the silicon bag to inflate the back and boost the breast, but in the present invention, it is not necessary to inflate the back, so when applying it to a part with less curvature In particular, it is not necessary to inject liquid into the silicon back, but when applied to a part with a large curvature, silicon is placed inside the silicon back to reduce friction and facilitate bending of the laminated coil. Inject oil.

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a transmission coil schema of a transcutaneous wireless power transmission system. An external coil 2 installed outside a human body 1 and an internal coil 2 implanted in a human body (mostly subcutaneous) are used to generate power by high-frequency electromagnetic induction. Transmit to. FIG. 2 is a schematic perspective view of a transmission coil for a transcutaneous wireless power transmission system according to an embodiment, and an external coil 2 and an internal coil 3 implanted under the skin 4 form a transmission coil pair. FIG. 3 is a cross-sectional view of the embodiment of FIG. 2 taken along a vertical cross section, and the coil 5 is contained in a back 6 made of silicon resin. FIG. 4 shows one coil produced using the flexible printed circuit board 8 contained in the silicon resin back 6 of the embodiment of FIG. FIG. 5 is a cross-sectional view taken along a vertical cross section when the transmission coil for the transcutaneous wireless power transmission system of the embodiment is implanted in a portion having a curvature of the body.

  As the coil 5, a flexible printed circuit board 8 in which a thin conductive foil is formed on a film-like insulating film is used, and a coil 9 in which wirings 9 are formed in a spiral shape by photoetching is produced. As a result, a flexible coil that can be greatly deformed can be obtained. Since there is a limit to the power that can be transmitted by one coil, the necessary number of coils are stacked in parallel so that the necessary power can be transmitted. The laminated coil is put in a back 6 made of silicon resin. Silicone resin has good biocompatibility, so there is no tissue toxicity and it is safe to implant in the body.

  When it is implanted in a portion having a large curvature on the body surface, the deformation of the coil becomes large. In such a case, since it becomes somewhat hard due to friction between the laminated coils built in the silicon bag as it is, it is preferable to inject silicon oil into the silicon bag.

  When a conventional hard coil is used, the compression force may concentrate on a part of the tissue sandwiched between the extracorporeal coil and the internal coil, and the area where the compression force is concentrated may cause compression necrosis. It was. However, since the coil of the embodiment is flexible and flexible, the compression force does not concentrate on a part of the tissue sandwiched between the extracorporeal coil and the intracorporeal coil, so that compression necrosis does not occur.

  The effect of the present invention was demonstrated. A flexible printed circuit board having a diameter of 9.6 cm formed by forming a copper foil having a thickness of 35 μm on a polyimide film having a thickness of 50 μm was made into a coil by making 32 turns of 0.4 mm wide wiring by photoetching. When power was transmitted at a distance of 1 cm between the two coils, it was possible to transmit about 2.3 W of power. Therefore, for example, when it is desired to transmit 20 W of power, nine sheets may be stacked in parallel. When this coil was bent with a curvature of 6 cm in radius, which is close to the curvature of the human chest wall side, and the power was transmitted at a distance of 1 cm in the same manner, about 2.3 W of power could be transmitted in the same way, There was almost no decline. From the above, it was demonstrated that the present invention can realize a soft and flexible transmission coil for a transcutaneous wireless power transmission system.

  As the flexible printed board used in the present invention, in addition to those using a polyimide insulating film, those using a flexible insulating material such as a photo solder resist film or a polyethylene terephthalate film can be used. Moreover, as a conductor foil for producing a coil, there is a method for producing by using vapor deposition of gold or the like in addition to a method for producing by etching using a copper foil.

DESCRIPTION OF SYMBOLS 1 Human body 2 External coil 3 Internal coil 4 Subcutaneous tissue 5 Coil made with flexible printed circuit board 6 Silicon resin back 7 Cable 8 Flexible printed circuit board 9 Spiral wiring on flexible printed circuit board

Claims (2)

  A transmission coil for a transcutaneous wireless power transmission system in which spiral coils produced using a flexible printed circuit board are stacked and built into a silicon resin bag.   The transmission coil for a transcutaneous wireless power transmission system according to claim 1, wherein silicone oil is sealed inside a silicone resin bag.