CN116780787A - Wireless energy supply receiving device implanted in body and wireless power transmission system - Google Patents

Abstract

The application relates to a wireless energy supply receiving device and a wireless power transmission system implanted in a body, wherein the receiving device comprises a shell containing a receiving coil, at least one fixing ring connected to the shell and positioned outside the shell, and the at least one fixing ring comprises an outer layer and an inner core wrapped by the outer layer, wherein the outer layer is made of a material with biocompatibility, and the inner core is made of at least one electromagnetic wire. Because the inner core of the fixed ring is an electromagnetic wire, the fixed ring can also serve as a receiving coil, so that the area for receiving magnetic force lines generated by the transmitting coil is effectively increased, the coupling coefficient between the coils in the body and the outside is enhanced, and the energy received by the coils in the body is increased.

Description

Wireless energy supply receiving device implanted in body and wireless power transmission system

Technical Field

The application relates to the field of medical equipment, in particular to a wireless energy supply receiving device implanted in a body and a wireless power transmission system comprising the receiving device.

Background

Wireless power transfer (Wireless Power Transfer, WPT) technology can directly transfer power to a load without conventional wire conduction or other physical contact, and thus has advantages of convenience, safety, reliability, and flexibility that are incomparable with conventional power transfer methods.

Implantable medical devices have become a rapidly evolving diagnostic and therapeutic modality in the biomedical engineering field. The power consumption of the implantable medical device is generally between a few microwatts and a few milliwatts, and the implantable medical device is usually powered by a chemical battery in a traditional mode, but due to the limitation of the volume, the battery has limited capacity and short power supply time, and the battery needs to be replaced periodically in a surgical mode, so that pain and burden are caused to a patient.

For this reason, a wireless power transmission system capable of charging an implantable medical device is proposed in the prior art, and generally includes a transmitting coil located outside the body and a receiving coil located inside the body (generally located in a blood vessel), wherein the transmitting coil transmits energy in the form of electromagnetic waves, and the electromagnetic waves are received by the receiving coil after penetrating tissues such as human skin and are transmitted to the implantable medical device. The in-vivo receiving coil of the system is usually placed in a closed shell, and the area capable of effectively receiving magnetic force lines is small, so that the problems of weak coupling capacity, extremely small in-vivo and-out-of-body coupling coefficient and extremely low energy acquisition are caused. In addition, to maximize the charging efficiency, the transmitting coil and the receiving coil must be aligned accurately and stably during charging, and the two coils should be as close as possible. If the receiving coil is not fixed firmly, the relative spatial relationship of the magnetic fields generated by the receiving coil and the transmitting coil in the body can be changed, the plane normal direction of the receiving coil can be in non-parallel or even perpendicular to the magnetic field direction, then the transmission characteristic in the receiving coil can be changed along with the change of the normal angle of the planes of the two coils, and the transmission stability of the system is reduced, namely once the receiving coil and the transmitting coil have larger relative deviation, the transmitted energy can be rapidly reduced along with the increase of the normal angle of the planes of the two coils, so that the transmission stability is greatly reduced and even the energy cannot be received.

Disclosure of Invention

An object of the present application is to improve the energy receiving efficiency of an in-vivo receiving coil.

To this end, the present application provides a wireless power receiving device implanted in a body, comprising a housing accommodating a receiving coil, at least one fixing ring connected to the housing and located outside the housing, the at least one fixing ring being fixed to the outside of the housing at both ends only, and comprising an outer layer and an inner core wrapped by the outer layer, wherein the outer layer is composed of a material having biocompatibility, and the inner core is composed of at least one electromagnetic wire.

In the above scheme, since the inner core of the fixed ring is an electromagnetic wire, the at least one fixed ring can also serve as a receiving coil besides the receiving coil in the shell, so that the area for receiving magnetic force lines generated by the transmitting coil is effectively increased, the coupling coefficient between the in-vivo coil and the in-vivo coil is enhanced, and the energy received by the in-vivo coil is increased. In addition, since the outer layer of the fixing ring is made of a biocompatible material, the fixing ring has good biocompatibility with human tissues in vivo, is not easy to cause adverse reactions such as immune reaction and the like, and can be combined with the surrounding human tissues to different degrees along with the time, so that the receiving device is more firmly fixed at a desired position.

According to some embodiments of the application, the magnet wires comprising the receiving coil are electrically connected to or are the same continuous magnet wire within the at least one stationary ring.

According to some embodiments of the application, the magnet wire is a high frequency litz wire. Litz wire (derived from Litz, also called enamelled wire) is an electromagnetic wire formed by twisting a plurality of enamelled single wires, which can effectively reduce the skin effect in high-frequency application and reduce the high-frequency current loss. Compared with single strand wires with the same cross section, the enameled stranded wire can reduce impedance, increase conductivity, improve efficiency and reduce heat generation, and has better flexibility.

According to some embodiments of the application, the biocompatible material is a shape memory alloy having superelasticity, the at least one retaining ring being in a contracted state prior to implantation of the wireless energy receiving device in the body, the at least one retaining ring returning to an at least partially expanded state after implantation of the wireless energy receiving device in a designated location in the body. In this embodiment, the overall size of the receiving device is small at the time of implantation, facilitating implantation, in particular into vessels of generally small diameter, since the fixation ring can be in a contracted state before implantation and gradually reverts to an expanded state after implantation, the fixation ring being expanded after implantation being able to abut tissue in its vicinity, for example against the vessel wall, thereby securing the receiving device in place with elastic support forces.

According to some embodiments of the application, the housing comprises a first housing and a second housing contained within the first housing, the first housing and the second housing each having a sidewall, an annular gap being provided between an outer surface of the sidewall of the second housing and an inner surface of the sidewall of the first housing, the receiving coil being located in the annular gap. Thus, the first and second housings may be open or semi-open housings having no upper and lower walls or having upper and lower walls provided with through holes, slots, meshes, etc., such that after implantation into the body, the body tissue fluid (e.g., blood) fills the interior of the housing. This arrangement is particularly advantageous in embodiments where the housing includes a control circuit board integrated with a load (e.g., a sensor for collecting blood parameters) inside the housing, as such a load must be immersed in the blood to meet its operational requirements. It will be readily appreciated that in such a case, the control circuit board should be subjected to a biocompatible treatment, for example, wrapping at least a portion thereof with a biocompatible material, so as not to be damaged or malfunction due to prolonged blood immersion.

According to some embodiments of the application, the first housing and the second housing further each comprise an upper wall and a lower wall such that the first housing and the second housing are both closed housings. In such a scheme, since the housing is closed, blood does not enter the housing, and thus the receiving coil, the control circuit board, etc. included in the housing can work more safely, and no special anti-blood treatment is necessary.

According to some embodiments of the application, the at least one fixing ring comprises a first fixing ring and/or a second fixing ring and/or a third fixing ring and/or a fourth fixing ring, the first end face of the first housing comprises two first through holes respectively arranged at the left and right sides of the center of the first end face and/or two second through holes respectively arranged at the upper and lower sides of the center of the first end face and/or two third through holes respectively arranged at the left and right sides of the center of the second end face and/or two fourth through holes respectively arranged at the upper and lower sides of the center of the second end face, wherein two ends of the first fixing ring are respectively connected to the two first through holes, two ends of the second fixing ring are respectively connected to the two third through holes, two ends of the fourth fixing ring are respectively connected to the two fourth through holes, the first fixing ring and the third fixing ring are in the same plane with the receiving coil in the housing when in the unfolded state, and the plane of the second fixing ring and the fourth fixing ring are in the plane with the receiving coil in the housing when in the unfolded state are approximately perpendicular to each other. In the above scheme, since the receiving device comprises the fixing rings which are positioned on different planes and can serve as the receiving coils, the area for effectively receiving magnetic force lines can be better ensured even if the receiving device deflects in a body. It should be understood that the receiving means may comprise only one or more of the first to fourth securing rings, or may comprise more securing rings. The specific parameters of the position, number, orientation, diameter, etc. of the retaining rings can be adjusted as desired by those skilled in the art.

According to some embodiments of the application, the second housing is hollow and accommodates the control circuit board, and has an opening on a side wall of the second housing, and the receiving coil is electrically connected to the first input end and the second input end of the control circuit board through the opening. In the above-described solution, since the control circuit board is integrated in the housing, the receiving device is more compact and small in its entirety, and is easier to implant in the body. When the shell is a closed shell, the control circuit board positioned in the shell can be prevented from being soaked by blood, so that the failure rate is reduced, and the service life is prolonged.

According to some embodiments of the present application, the control circuit board further includes an output end first and an output end second, and a compensation network and a rectifying and filtering circuit are disposed between the input end first and the input end second and the output end first and the output end second, and the control circuit board further includes a microcontroller unit electrically connected to the output end of the rectifying and filtering circuit, and a wireless communication module communicatively connected to the microcontroller unit. In this way, the energy received by the receiving device is converted into a direct current signal capable of supplying power to the load after being processed by the compensation network and the rectifying and filtering circuit. And the microcontroller unit can sample voltage and current, the sampled signal is transmitted to the external transmitting end coil through the wireless communication module, and the transmitting end adjusts the energy of the transmitting coil according to the received data, so that the energy requirements of different loads are better met. Advantageously, the control circuit board further comprises a voltage conversion module located between the rectifying and filtering circuit and the first and second output terminals. In the scheme, the direct current signals processed by the compensation network and the rectifying and filtering circuit can be subjected to voltage conversion and then supplied to the load, so that the voltage requirements of different loads can be better met.

According to some embodiments of the application, the control circuit board further comprises a load, a compensation network, a rectifying and filtering circuit and an optional voltage conversion module are arranged between the first input end, the second input end and the load, and the control circuit board further comprises a microcontroller unit electrically connected with the output end of the rectifying and filtering circuit and a wireless communication module in communication connection with the microcontroller unit. In such a scheme, the load is directly integrated on the control circuit board, so that the connection between the load and the control circuit board and the opening for the connection to pass through are avoided, and the whole device is compact and small. When the housing is open or semi-open, the control circuit board is advantageously coated with a biocompatible material to avoid damage or failure due to prolonged blood infusion.

According to some embodiments of the application, the wireless power receiving device is sized so that it can be implanted in a blood vessel. In this way, the receiving device can be percutaneously delivered into a blood vessel without extensive surgical intervention to power the load (e.g., medical device, sensor) within the body.

The application also relates to a wireless power transmission system comprising an energy transmitting device and a wireless energy receiving device implanted in a body as described above. The energy transmitting device is usually arranged outside the body, and is matched with the wireless energy supply receiving device in the body to realize wireless electric energy transmission when in operation, so as to supply power or charge for medical instruments in the body.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application as claimed. Other features, objects, and advantages of the application will be apparent from the description and drawings, and from the claims.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the description of the embodiments will be briefly described below. Those skilled in the art will readily appreciate that these drawings are for illustrative purposes only and are not intended to limit the scope of the present application. For purposes of illustration, the figures may not be drawn to scale entirely.

Fig. 1 is a schematic perspective view of a wireless power receiving device implanted in a body according to an embodiment of the present application, wherein the fixing ring is not shown.

Fig. 2 is a schematic top view of the wireless power receiving device of fig. 1 after implantation into a blood vessel, showing a retaining ring with magnet wires in the retaining ring in series with a receiving coil in the housing.

Fig. 3 is an expanded schematic view of the series connection of fig. 2.

Fig. 4 is a schematic top view of a wireless power receiving device according to a variation of the embodiment of fig. 1 after implantation in a blood vessel, showing a retaining ring with magnet wires in the retaining ring in parallel with the receiving coil in the housing.

Fig. 5 is an expanded schematic view of the parallel connection line of fig. 4.

Fig. 6 is a schematic circuit diagram of a control circuit board of the wireless power receiving apparatus of fig. 1.

Fig. 7 is a schematic perspective view of a wireless power receiving device implanted in a body according to another embodiment of the present application, wherein the fixing ring is not shown.

Fig. 8 is a schematic top view of the wireless power receiving device of fig. 7 after implantation in a blood vessel, showing a retaining ring with magnet wires in the retaining ring in series with the receiving coil in the housing.

Fig. 9 is a schematic top view of a wireless power receiving device according to a variation of the embodiment of fig. 7 after implantation in a blood vessel, showing a retaining ring with magnet wires in the retaining ring in parallel with the receiving coil in the housing.

Fig. 10 is a schematic circuit diagram of a control circuit board of the wireless power receiving apparatus of fig. 7.

Fig. 11 is a schematic block diagram of a securing ring of a wireless power receiving apparatus according to various embodiments of the present application.

List of reference numerals

100. A wireless energy supply receiving device; 1. a housing; 10. a first housing; 10A first end face; 10B second end face; 20. a second housing; 30. a control circuit board; 11. a first through hole; 12. a second through hole; 13. a third through hole; 14. a fourth through hole; 15. a fifth through hole; 16. a sixth through hole; 2. a fixing ring; 21. a first fixing ring; 22. a second fixing ring; 23. a third fixing ring; 24. a fourth fixing ring; 3. a receiving coil; 4. a blood vessel; 25. an outer layer; 26. an inner core; 5. a load; 31. a compensation network; 32. a rectifying and filtering circuit; 33. a voltage conversion module; 34. a wireless communication module; 35. a microcontroller unit; an input end I of A; a second input end; c output end I; d output end II

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus consistent with aspects of the application as detailed in the accompanying claims.

Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as may be used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items. The word "comprising" or "comprises", and the like, means that elements or items appearing before "comprising" or "comprising" are encompassed by the element or item recited after "comprising" or "comprising" and equivalents thereof, and that other elements or items are not excluded. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The term "plurality" includes two, corresponding to at least two. It should be understood that although the terms first, second, third, etc. may be used herein to describe various information, these information should not be limited by these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the application.

Fig. 1 and 2 schematically illustrate in perspective and top view, respectively, a wireless power receiving device 100 for implantation in a body, which is part of a wireless power transmission system, and which further includes an energy emitting device (not shown), typically located outside the body. When in charging, the energy transmitting device transmits energy in the form of electromagnetic waves, which penetrate tissues such as human skin, and then are received by the wireless energy receiving device 100 and converted into electric energy, and the electric energy is transmitted to an in-vivo load (e.g., an implantable medical device, a sensor) electrically connected with the wireless energy receiving device 100 or integrated in the wireless energy receiving device 100, and the electric energy can be stored in a battery of the load or directly used by the load, for example. The wireless power receiving device 100 is sized to be implanted in a body, particularly percutaneously, in a patient's blood vessel.

In the embodiment shown in fig. 1, 2, the wireless power receiving device 100 comprises a housing 1 containing a receiving coil 3, at least one fixing ring 2 connected to the housing 1 and located outside the housing 1. In the present embodiment, the fixing ring 2 includes a first fixing ring 21, a second fixing ring 22, and a third fixing ring 23 and a fourth fixing ring 24, both ends of which are connected to the left end of the housing 1, and both ends of which are connected to the right end of the housing 1. It should be understood that the wireless power receiving apparatus 100 may include only one or more of the first through fourth stationary rings, or may include more stationary rings. As shown in fig. 11, the fixing ring includes an outer layer 25 and an inner core 26 wrapped by the outer layer 25, wherein the outer layer 25 is made of a biocompatible material (for example, a metal or nonmetal material such as nickel-titanium alloy, stainless steel, silica gel, PA nylon, etc.), and the inner core 26 is made of at least one electromagnetic wire. The magnet wire may be electrically connected to the magnet wire constituting the receiving coil 3 or may be the same continuous magnet wire as it. The magnet wire of the inner core 26 and/or the magnet wire constituting the receiving coil 3 is preferably a high frequency litz wire.

In the above scheme, since the inner core of the fixing ring 2 is an electromagnetic wire, besides the receiving coil 3 in the casing 1, the fixing rings can also serve as receiving coils, so that the area for receiving magnetic force lines generated by the transmitting coil is effectively increased, the coupling coefficient between the in-vivo and the in-vitro coils is enhanced, and the energy received by the in-vivo coils is increased. It will be readily appreciated that the greater the number of retaining rings, the greater the area enclosed, the more pronounced this effect.

In addition, since the outer layer of the fixing ring 2 is made of a biocompatible material, the fixing ring has good biocompatibility with human tissues in vivo, and adverse reactions such as immune response and the like are not easy to cause. Preferably, the biocompatible material is an elastic material such that the securing ring secures the wireless energy receiving device 100 in a desired position by virtue of the elastic supporting force of the outer elastic material at an early stage after the wireless energy receiving device 100 is implanted in the body, and the material is bonded to surrounding human tissue to a different extent over time, thereby more firmly securing the wireless energy receiving device 100 in the desired position. More preferably, the biocompatible material is a shape memory alloy (e.g., nitinol, shape memory stainless steel) that is superelastic, such that the retaining ring 2 is in a contracted state prior to implantation of the wireless energy receiving device 100, resulting in a smaller overall size of the wireless energy receiving device 100 for implantation; after the wireless energy receiving device 100 is implanted at a designated location within the body, the securing ring 2 gradually returns to at least a partially deployed state, abutting tissue in its vicinity, such as against a vessel wall, thereby securing the wireless energy receiving device 100 in place with elastic support forces.

In the exemplary embodiment shown in fig. 1 and 2, the housing 1 includes a first housing 10 and a second housing 20 contained in the first housing 10, and the first housing 10 and the second housing 20 are each substantially rectangular parallelepiped closed housings having cambered surfaces at both ends. The housing 1 may be made of a gas-tight, solid and biocompatible material, such as bioceramics, which a person skilled in the art may choose according to the actual needs, without limitation. The outer surfaces of the upper and lower walls of the second housing 20 are fixed to the inner surfaces of the upper and lower walls of the first housing 10 or the first housing 10 and the second housing 20 have common upper and lower walls, respectively. As shown in fig. 1, the outer surface of the side wall (i.e., front side wall, rear side wall, left side wall, right side wall) of the second housing 20 and the inner surface of the side wall (i.e., front side wall, rear side wall, left side wall, right side wall) of the first housing 10 have an annular gap 17 therebetween (see fig. 1), and the receiving coil 3 is wound on the outer surface of the side wall of the second housing 20 and/or fixed on the inner surface of the side wall of the first housing 10 or otherwise disposed in the annular gap 17. Advantageously, the side wall outer surface of the second housing 20 or the side wall inner surface of the first housing 10 has a groove for accommodating the receiving coil 3, so that the receiving coil 3 can be more easily fixed and is less likely to be displaced or detached. It should be understood that the first housing 10 and the second housing 20 may also have any other suitable shape, such as a capsule shape, an ellipsoid, a cylinder, as long as the shape is easy to manufacture and easy to implant into the body. Preferably, the shape does not have sharp corners so as to avoid damaging human tissue, especially blood vessels, during implantation.

As best shown in fig. 1, in the present embodiment, a first end face 10A of a first housing 10 (preferably, a longitudinal end face in the housing length direction) includes two first through holes 11 provided on both left and right sides of a center of the first end face 10A, and two second through holes 12 provided on both upper and lower sides of the center of the first end face 10A, and a second end face 10B opposite to the first end face 10A includes two third through holes 13 provided on both left and right sides of the center of the second end face 10B, and two fourth through holes 14 provided on both upper and lower sides of the center of the second end face 10B. The first, second, third and fourth fixing rings 21, 22, 23, 24 are hermetically connected at both ends thereof to the two first through holes 11, the two second through holes 12, the two third through holes 13, the two fourth through holes 14, respectively, to prevent tissue fluid (e.g., blood) in the body from flowing into the housing 1 to affect the normal operation of the receiving coil, the control circuit board, etc. therein, while the portions of these fixing rings other than the both ends are not connected to the first end face 10A or the second end face 10B. In other words, the first, second, third, and fourth fixing rings 21, 22, 23, and 24 are fixed to the outside of the first housing at only both ends. Preferably, the two first through holes 11 and/or the two second through holes 12 are symmetrical about the center of the first end face 10A, and the two third through holes 13 and/or the two fourth through holes 14 are symmetrical about the center of the second end face 10B. Preferably, as shown in fig. 2, the first fixing ring 21 and the third fixing ring 23 are in a substantially same plane with the receiving coil 3 in the housing 1 when in the unfolded state, and the plane in which the second fixing ring 22 and the fourth fixing ring 24 are in the unfolded state is substantially perpendicular to the plane in which the receiving coil 3 is located. Thus, even if the wireless power receiving apparatus 100 deflects in the body, the area for efficiently receiving the magnetic force lines can be ensured. It should be understood that the wireless power receiving apparatus 100 may include only one or more of the first through fourth stationary rings, or may include more stationary rings. For example, two or more fixing rings may be disposed at two ends of the housing 1, and a certain included angle is formed between planes in which the fixing rings are disposed. According to one embodiment, 3 fixing rings are arranged on each longitudinal end face of the housing 1, one fixing ring and the receiving coil 3 are on the same plane, and an included angle of 60 degrees is formed between every two fixing rings. It will also be appreciated that one or more retaining rings may be provided on one or more sides of the housing 1 other than the longitudinal end faces. The number, mounting location and orientation of the retaining rings are not limited by the present application.

In the present embodiment, as shown in fig. 1, the second housing 20 is preferably hollow and accommodates the control circuit board 30, and an opening (not shown) is provided on a side wall of the second housing 20 through which the receiving coil 3 is electrically connected to the control circuit board 30. According to the embodiment shown in fig. 2 and 3, the litz wires in the first, second, third and fourth fixing rings 21, 22, 23, 24 are electrically connected to the first and second input terminals a, B of the control circuit board 30 through openings in the side wall of the second housing 20 after being connected in series with the receiving coil 3. According to another embodiment shown in fig. 4 and 5, the litz wires in the first and second fixing rings 21, 22 are connected in series with a part of the receiving coil 3, and the litz wires in the third and fourth fixing rings 23, 24 are connected in series with a part of the receiving coil 3, and then connected in parallel to the first and second input terminals a, B of the control circuit board 30. Of course, the fixing rings and the receiving coil 3 can also be connected in any other suitable manner.

Fig. 6 shows an example of the control circuit board 30 in the above embodiments. In the example shown in this figure, the control circuit board 30 comprises, in addition to the above-mentioned input terminals a, B, an output terminal C, an output terminal D, between which are arranged a, B and C, D a compensation network 31, a rectifying and filtering circuit 32, an optional voltage conversion module 33 for converting alternating current into direct current, an MCU (i.e. a microcontroller unit 35), and a wireless communication module 34 (e.g. a bluetooth communication module). As shown in fig. 1, the first casing 10 and the second casing 20 are further provided with a sixth through hole 16 and a fifth through hole 15 on the side walls thereof close to the load 5, respectively, for passing the lead wires of the load 5. As shown in fig. 2 and 4, the lead wires of the load 5 (e.g., an implantable medical device) located outside the housing 1 may pass through the sixth and fifth through holes 16 and 15 and then be electrically connected to the output terminals one C and two D of the control circuit board 30. The energy received by the wireless energy supply receiving device 100 is processed by the compensation network 31 and the rectifying and filtering circuit 32 and then converted into a direct current signal, and the direct current signal can directly supply power to the load 5 or supply power to the load 5 after voltage conversion by the voltage conversion module 33. The MCU electrically connected to the output of the rectifying and filtering circuit 32 can sample the voltage and current, and the sampled signal is transmitted to the external transmitting end coil through the wireless communication module 34, and the transmitting end adjusts the energy of the transmitting end coil according to the received data.

Fig. 7-10 illustrate further embodiments of the present application. These embodiments differ from the embodiment shown in fig. 1 only in that the housing 1 is an open housing and the load 5 is integrated on the control circuit board 30. Thus, the features described above with reference to fig. 1-6 may be applied to these embodiments alone or in combination without conflict, and vice versa. Specifically, in the embodiment shown in fig. 7, the first and second cases 10 and 20 have only side walls without upper and lower walls, and the control circuit board 30 is fixed to the side walls (e.g., front and rear side walls) of the second case 20. Of course, the first casing 10 and the second casing 20 may have upper and lower walls, but the upper and lower walls and/or the side walls may be provided with through holes, slits, meshes, etc. through which blood flows. In such an embodiment, since the housing 1 is open or semi-open, the body tissue fluid (e.g. blood) will fill the interior of the housing 1, such that the control circuit board 30 inside the housing 1 is immersed therein, which arrangement is particularly advantageous when the load 5 is a sensor for collecting blood parameters. It will be readily appreciated that in this case, the control circuit board 30 should be subjected to a biocompatible treatment, for example, wrapping at least a portion thereof with a biocompatible material, so as not to be damaged or malfunction due to prolonged blood immersion. Fig. 8 and 9 are similar to fig. 2 and 4, respectively, and illustrate the serial and parallel connection situations, and are not described herein. Fig. 10 shows an example of the control circuit board 30 in the embodiment of fig. 7-9. The example shown in fig. 6 differs from the example shown in fig. 6 only in that a load 5 (e.g. a sensor for collecting blood parameters) is also integrated on the control circuit board 30, the output of the rectifying-and-filtering circuit 32 being connected directly to or via a voltage conversion module 33 to the load 5.

The application also relates to a wireless power transfer system comprising an energy emitting device (not shown) typically located outside the body and a wireless power receiving device 100 as described above implanted in the body. When electric energy transmission is carried out, a transmitting coil of the energy transmitting device is close to the receiving device, a receiving coil with larger receiving area (larger energy receiving range) formed by the receiving coil 3 and the fixed ring 2 in the shell 1 receives alternating magnetic field energy transmitted by the transmitting coil, and generated current is directly transmitted to a load 5 integrated on the control circuit board 30 for use after being processed by the control circuit board 30, or is transmitted to the load 5 positioned outside the shell 1 through a lead wire, or is stored in an electric storage device of the load 5. The MCU on the control circuit board 30 can sample the voltage and current at the output terminal, and the sampled signal is transmitted to the external transmitting terminal coil through the wireless communication module 34, and the transmitting terminal adjusts the energy of the transmitting coil according to the received data.

The accompanying drawings and the foregoing description describe non-limiting specific embodiments of the present application. Some conventional aspects have been simplified or omitted in order to teach the inventive principles. It should be understood by those skilled in the art that any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the present application. Those skilled in the art will appreciate that the above features can be combined in various ways to form multiple variations of the application without conflict. Thus, the present application is not limited to the specific embodiments described above, but only by the claims and their equivalents.

Claims (14)

1. A wireless energy supply receiving device implanted in a body, characterized by comprising a housing (1) containing a receiving coil (3), at least one fixing ring (2) connected to the housing (1) and located outside the housing (1), the at least one fixing ring (2) being fixed to the outside of the housing (1) at both ends only, and comprising an outer layer (25) and an inner core (26) wrapped by the outer layer, wherein the outer layer (25) is composed of a biocompatible material, the inner core (26) is composed of at least one electromagnetic wire, wherein the biocompatible material is a shape memory alloy having superelasticity, the at least one fixing ring (2) is in a contracted state before the wireless energy supply receiving device (100) is implanted in the body, and the at least one fixing ring (2) is restored to an at least partially expanded state after the wireless energy supply receiving device (100) is implanted in a designated position in the body.

2. The wireless power receiving apparatus according to claim 1, wherein the magnet wires constituting the receiving coil (3) are electrically connected to the magnet wires in the at least one stationary ring (2) or are the same continuous magnet wires as the magnet wires in the at least one stationary ring (2).

3. The wireless power receiving apparatus of claim 2, wherein the magnet wire is a high frequency litz wire.

4. The wireless power supply reception device according to claim 1, wherein the housing (1) comprises a first housing (10) and a second housing (20) contained in the first housing (10), the first housing (10) and the second housing (20) each having a side wall, an annular gap being provided between an outer surface of the side wall of the second housing (20) and an inner surface of the side wall of the first housing (10), the receiving coil (3) being located in the annular gap.

5. The wireless power receiving apparatus according to claim 4, wherein the first housing (10) and the second housing (20) further each include an upper wall and a lower wall such that both the first housing (10) and the second housing (20) are closed housings.

6. The wireless power receiving apparatus according to claim 4, wherein the at least one fixing ring (2) comprises a first fixing ring (21) and/or a second fixing ring (22) and/or a third fixing ring (23) and/or a fourth fixing ring (24), the first end face (10A) of the first housing (10) comprises two first through holes (11) respectively provided on the left and right sides of the center of the first end face (10A) and/or two second through holes (12) respectively provided on the upper and lower sides of the center of the first end face (10A) and/or two third through holes (13) respectively provided on the left and right sides of the center of the second end face (10B) and/or two fourth through holes (14) respectively provided on the upper and lower sides of the center of the second end face (10B), wherein both ends of the first fixing ring (21) are respectively connected to the two first through holes (11), both ends of the second fixing ring (22) are respectively connected to the two second through holes (12), the third fixing ring (23) are respectively connected to the third fixing ring (23) and the third fixing ring (14) are in a state in which the same as the first fixing ring (21) and the second fixing ring (23) are respectively, the plane of the second fixing ring (22) and the plane of the fourth fixing ring (24) when in the unfolded state are perpendicular to the plane of the receiving coil (3) in the shell.

7. The wireless power receiving device according to any one of claims 4 to 6, wherein the second housing (20) is hollow and accommodates a control circuit board (30), and has an opening on a side wall thereof, and the receiving coil (3) is electrically connected to an input terminal one (a) and an input terminal two (B) of the control circuit board (30) through the opening.

8. The wireless power receiving device according to claim 7, wherein the control circuit board (30) further comprises an output end one (C) and an output end two (D), a compensation network (31) and a rectifying and filtering circuit (32) are arranged between the input end one (a) and the input end two (B) and the output end one (C) and the output end two (D), and the control circuit board (30) further comprises a microcontroller unit (35) electrically connected with the output end of the rectifying and filtering circuit (32) and a wireless communication module (34) communicatively connected with the microcontroller unit (35).

9. The wireless power receiving apparatus as defined in claim 8, wherein said control circuit board (30) further comprises a voltage conversion module (33) located between said rectifying and filtering circuit (32) and said first (C) and second (D) outputs.

10. The wireless power supply receiving device according to claim 7, wherein the control circuit board (30) further comprises a load (5), a compensation network (31), a rectifying and filtering circuit (32) are arranged between the first input (a) and the second input (B) and the load (5), and the control circuit board (30) further comprises a microcontroller unit (35) electrically connected to an output of the rectifying and filtering circuit (32) and a wireless communication module (34) communicatively connected to the microcontroller unit (35).

11. The wireless power receiving device according to claim 10, wherein the control circuit board (30) further comprises a voltage conversion module (33) located between the rectifying and filtering circuit (32) and the load (5).

12. The wireless power receiving apparatus as defined in claim 7, wherein said control circuit board (30) is coated with a biocompatible material.

13. The wireless power receiving device of any one of claims 1-6, wherein the wireless power receiving device is sized to be implanted in a blood vessel.

14. A wireless power transfer system comprising an energy transmitting device and further comprising a wireless power receiving device as claimed in any one of claims 1 to 13.