Medical instrument and medical device

Abstract

The invention provides a medical instrument and a medical device, which can ensure the arrangement surface of a light-emitting part and realize the miniaturization of the radial dimension of a main body part. A medical device (10) that is implanted into a living body and is provided with: a main body section (11) that has a recessed section (11a) that is open on the top surface and extends in the thickness direction, and that is capable of storing a liquid in the recessed section (11a); a cover part (12) which is composed of a soft member that can be pierced by an injection needle, and which closes the opening of the recess part (11a); a power reception coil (13) that receives power transmitted from the power transmission coil (22a); and a circuit board (14) provided on one surface thereof with a light emitting unit (14a) that emits light by means of the power received by the power receiving coil (13), the circuit board (14) being disposed on the outer peripheral side of the recess (11a) in the main body section (11). Furthermore, the circuit board (14) extends along the outer peripheral side of the recess (11a) in a posture in which the surface on which the light-emitting part (14a) is arranged faces the radial outer side of the main body part (11).

Description

Technical Field

[0001] The present invention relates to a medical device and a medical apparatus implanted in a living body. Background Art

[0002] Conventionally, as a medical device implanted in a living body, there is known a medical device including: a main body portion having a recess that opens at the top surface and extends in the thickness direction and capable of storing a liquid in the recess; a lid portion formed of a soft member that can be pierced by an injection needle and closing the opening of the recess of the main body portion; a power receiving coil that receives power transmitted from a power transmission coil; and a circuit board having a light emitting portion that emits light using the power received by the power receiving coil provided on one surface thereof, and disposed on the outer peripheral side of the recess in the main body portion (for example, refer to Patent Document 1).

[0003] In the case where a medical device implanted in a living body approaches an extracorporeal unit having a power transmission coil, power is transmitted from the power transmission coil to the power receiving coil to cause the light emitting portion to emit light. Therefore, the position of the lid portion can be determined from outside the living body by the light emitted from the light emitting portion.

[0004] [Prior Art Documents]

[0005] (Patent Document)

[0006] Patent Document 1: International Publication No. 2022 / 102393 Summary of the Invention

[0007] [Problems to be Solved by the Invention]

[0008] In a medical device implanted in a living body, a circuit board provided on the main body portion extends in the radial direction of the main body portion, and a light emitting portion is provided on the top surface of the circuit board extending in the radial direction of the main body portion. Therefore, the main body portion of the medical device is formed to have a radial dimension capable of mounting a circuit board on which the light emitting portion can be provided. On the other hand, from the viewpoint of reducing invasiveness to the living body, a medical device implanted in a living body requires miniaturization of the radial dimension of the main body portion.

[0009] An object of the present invention is to provide a medical device and a medical apparatus that can ensure a mounting surface for the light emitting portion and achieve miniaturization of the radial dimension of the main body portion.

[0010] [Means for Solving the Problems]

[0011] The medical device of the present invention is implanted into a living body and includes: a main body portion having a recess with an opening on the top surface and extending in the thickness direction, capable of storing a liquid in the recess; a lid portion composed of a soft member that can be pierced by an injection needle, closing the opening of the recess; a power receiving coil that receives power transmitted from a power transmission coil; and a circuit board having a light emitting portion that emits light using the power received by the power receiving coil on one surface thereof, disposed on the outer peripheral side of the recess in the main body portion; and the circuit board extends along the outer peripheral side of the recess in a posture with the surface provided with the light emitting portion facing radially outward of the main body portion.

[0012] In addition, in the medical device of the present invention, the light emission direction of the light emitting portion, that is, the irradiation direction, faces upward of the main body portion in a state where the circuit board is disposed on the outer peripheral side of the recess.

[0013] In addition, in the medical device of the present invention, the power receiving coil is disposed between the lid portion and the circuit board.

[0014] In addition, in the medical device of the present invention, the power receiving coil is disposed on the outer peripheral side of the circuit board.

[0015] In addition, the medical device of the present invention includes: an extracorporeal unit having a power transmission coil for transmitting power; and a medical device having a power receiving coil for receiving power transmitted from the extracorporeal unit and implanted into a living body; and the medical device includes: a main body portion having a recess with an opening on the top surface and extending in the thickness direction, capable of storing a liquid in the recess; a lid portion composed of a soft member that can be pierced by an injection needle, closing the opening of the recess; and a circuit board having a light emitting portion that emits light using the power received by the power receiving coil on one surface thereof, disposed on the outer peripheral side of the recess in the main body portion; and the circuit board extends along the outer peripheral side of the recess in a posture with the surface provided with the light emitting portion facing radially outward of the main body portion.

[0016] (Advantages of the Invention)

[0017] According to the present invention, since the width direction of the circuit board faces the thickness direction of the main body portion, in a state where the circuit board is mounted on the main body portion, the outer diameter dimension of the circuit board in the radial direction of the main body portion can be reduced, so that a setting surface for the light emitting portion can be ensured and miniaturization of the radial dimension of the main body portion can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a side sectional view of a medical device according to an embodiment of the present invention.

[0019] Figure 2 is a perspective view of a medical device according to an embodiment of the present invention.

[0020] Figure 3 It is an exploded perspective view of a medical device according to an embodiment of the present invention.

[0021] Figure 4 It is a schematic diagram of a circuit board according to an embodiment of the present invention.

[0022] Figure 5 It is a side sectional view of a medical device according to another embodiment of the present invention.

[0023] Figure 6 It is a circuit diagram showing an example of a power receiving circuit of the medical device of the present invention.

[0024] Figure 7 It is a circuit diagram showing another example of a power receiving circuit of the medical device of the present invention.

[0025] Figure 8 It is a circuit diagram showing another example of a power receiving circuit of the medical device of the present invention.

[0026] Figure 9 It is a circuit diagram showing another example of a power receiving circuit of the medical device of the present invention.

[0027] Figure 10 It is a side sectional view of the main part for explaining the connection structure between the power receiving coil and the circuit board of the present invention.

[0028] Figure 11 It is a side view of the main part for explaining the connection structure between the power receiving coil and the circuit board of the present invention.

[0029] Figure 12 It is a plan sectional view for explaining the connection structure between the power receiving coil and the circuit board of the present invention.

[0030] Figure 13 It is a side view of the main part for explaining the connection structure between the power receiving coil and the circuit board of the present invention. Detailed Embodiments

[0031] Figures 1 to 3 It is a view showing an embodiment of the present invention. Figure 1 It is a side sectional view of a medical device, Figure 2 It is a perspective view of a medical device, Figure 3 It is an exploded perspective view of a medical device.

[0032] Such as Figure 1As shown, the medical device 1 of the present embodiment has: a medical instrument 10, which is used in a state of being implanted in a living body such as a human or an animal; and an extracorporeal unit 20, which is used to supply power to the medical instrument 10. The medical device 1 supplies power to the medical instrument 10 from the extracorporeal unit 20 in a non-contact manner.

[0033] The medical instrument 10 is a type of central venous catheter that injects a liquid medicine into the central vein near the heart of the living body, that is, a subcutaneous implantable infusion port (central venous (CV) infusion port). As Figures 1 to 3 shown, the medical instrument 10 includes: a main body portion 11, which has a recess 11a capable of storing a liquid such as a liquid medicine; a lid portion 12, which closes the opening of the recess 11a of the main body portion 11; a power receiving coil 13, which receives power transmitted from the extracorporeal unit 20; a circuit board 14, on one surface of which a plurality of light emitting portions 14a that emit light using the power received by the power receiving coil 13 are provided, and is disposed on the outer peripheral side of the recess 11a in the main body portion 11; and a catheter (not shown), one end of which communicates with the recess 11a of the main body portion 11, and the other end side is inserted into the central vein of the living body.

[0034] The main body portion 11 is made of a resin material such as polyphenylene sulfide (PPS), polyethersulfone (PES), polyether ether ketone (PEEK), etc., and is formed in a substantially frustoconical shape. In the main body portion 11, a recess 11a with an opening on the top surface and extending linearly toward the bottom surface is formed, and a liquid is stored in the recess 11a. The main body portion 11 is composed of an upper side member 11b and a lower side member 11c, and the power receiving coil 13 and the circuit board 14 are accommodated in a space 11d formed between the upper side member 11b and the lower side member 11c. The space 11d extends in a ring shape so as to surround the outer peripheral side of the recess 11a. A liquid flow passage 11c1 is formed in the lower side member 11c, and the liquid flow passage 11c1 is provided so as to extend from the bottom side of the recess 11a toward the outer peripheral side, and is for the liquid stored in the recess 11a to flow through. One end of the catheter is connected to the liquid flow passage 11c1. In addition, the recess 11a is sometimes also referred to as a liquid medicine tank or the like.

[0035] The lid portion 12 is made of a soft member such as silicone rubber that can be repeatedly pierced by an injection needle. The lid portion 12 has a cylindrical lid main body 12a and a flange portion 12b that extends outward in the entire circumferential direction of the outer peripheral portion of the lid main body 12a. The lid main body 12a is the part where the injection needle repeatedly pierces from the outside of the living body. In addition, the flange portion 12b is located in the space 11d of the main body portion 11.

[0036] The power receiving coil 13 is formed into a ring shape having an inner diameter dimension larger than the outer diameter dimension of the flange portion 12b of the lid portion 12, for example, by repeatedly winding a copper wire. The power receiving coil 13 is formed into a ring shape having a thickness of about 0.4 mm and an axial length of about 1.2 mm, for example, by winding a wire with an outer diameter of 0.2 mm two turns in the radial direction and six turns in the axial direction. In addition, the power receiving coil 13 is disposed between the lid portion 12 and the circuit board 14.

[0037] The circuit board 14 is a so-called flexible board in which wirings such as copper foils are printed on an insulator formed by forming a resin material into a film shape, and is formed into a flexible strip shape. The thickness of the film-shaped insulator of the circuit board 14 is, for example, about 0.05 mm, and the thickness of the circuit board 14 is, for example, 0.1 mm at the smallest part. On one surface of the circuit board 14, a plurality of light emitting portions 14a arranged at open intervals and a resonance circuit (not shown) connected to the plurality of light emitting portions 14a are disposed. The circuit board 14 has a width direction dimension that can accommodate the size of the light emitting portion 14a. In addition, on the circuit board 14, the power receiving coil 13 is connected, and the power received by the power receiving coil 13 is supplied to each of the plurality of light emitting portions 14a. Further, in a state where the circuit board 14 is mounted on the main body portion 11, the circuit board 14 extends along the outer peripheral side of the concave portion 11a in a posture with the surface on which the plurality of light emitting portions 14a are provided facing the radially outer side of the main body portion 11. In a state where the circuit board 14 is mounted on the main body portion 11, as Figure 3 shown, it forms an arc shape surrounding a part of the outer peripheral side of the concave portion 11a.

[0038] Here, when the circuit board 14 made of a flexible board adopts an arc shape surrounding the concave portion 11a, the flexibility of the portion where rigid electronic components such as the light emitting portion 14a are provided is lost. Therefore, the circuit board 14 made of a flexible board is preferably as Figure 4 shown, the portion where the rigid electronic components are provided extends linearly, and the portion other than the portion where the electronic components are provided is formed into an arc shape.

[0039] The plurality of light emitting portions 14a are, for example, light emitting diodes (LEDs) that emit light by applying a voltage. The plurality of light emitting portions 14a are each mounted on the circuit board 14 in such a manner that the direction in which light is emitted, that is, the irradiation direction, faces upward of the main body portion 11 in a state where the circuit board 14 is disposed on the outer peripheral side of the concave portion 11a.

[0040] The extracorporeal unit 20 is as Figure 1As shown, there is a housing 21 sized to be held by a human hand, and a power transmission unit 22 disposed inside the housing 21. The power transmission unit 22 has, for example, a power transmission coil 22a formed in a ring shape by repeatedly winding a copper wire, and a resonant circuit (not shown) connected to the power transmission coil 22a. When the extracorporeal unit 20 approaches the medical device 10, resonance is generated between the power transmission coil 22a of the power transmission unit 22 and the power receiving coil 13 of the medical device 10, and power is transmitted from the power transmission coil 22a to the power receiving coil 13.

[0041] In the medical device 1 configured as described above, the medical device 10 is used in a state of being implanted in a living body. In the concave portion 11a of the main body portion 11, a liquid such as a medicinal solution to be administered to the living body is injected through an injection needle such as a non-invasive needle (huber needle) in a state of piercing the cover portion 12 from the outside of the living body. The liquid injected into the concave portion 11a of the main body portion 11 flows through the liquid flow passage 11c1 in the catheter and is sent into the central vein of the living body.

[0042] In addition, when the medical device 10 implanted in the living body is pierced by the injection needle, it is necessary to determine the position of the cover portion 12 on the living body. Therefore, when the cover portion 12 of the medical device 10 implanted in the living body is pierced by the injection needle, the extracorporeal unit 20 is brought close to the portion where the medical device 10 is implanted from the outside of the living body, and the power transmission coil 22a is energized. As a result, since the power transmission coil 22a of the extracorporeal unit 20 is close to the power receiving coil 13 of the medical device 10, power is transmitted from the power transmission coil 22a to the power receiving coil 13, and the plurality of light emitting portions 14a emit light using the power received by the power receiving coil 13. The plurality of light emitting portions 14a respectively irradiate light upward toward the main body portion 11, and thus irradiate light upward from the outer peripheral side of the cover portion 12. Therefore, the light reaches the outer peripheral portion of the cover portion 12 on the surface of the living body, and the position of the cover portion 12 can be determined. In this state, by aiming at the portion surrounded by the plurality of light emitting portions 14a and piercing with the injection needle, the cover portion 12 can be reliably pierced with the injection needle. In addition, the power receiving coil 13 and the circuit board 14 are located on the cover portion 12 side of the plurality of light emitting portions 14a. Therefore, the light emitted from the light emitting portion 14a is blocked by the power receiving coil 13 and the circuit board 14 and does not leak to the cover portion 12 side, so that the outline of the cover portion 12 can be clearly visually confirmed from the outside of the living body.

[0043] Thus, the medical device according to the present embodiment is a medical device 10 implanted into a living body, and includes: a main body portion 11 having a recess 11a with an open top surface and extending in the thickness direction, capable of storing a liquid in the recess 11a; a lid portion 12 formed of a soft member that can be pierced by an injection needle, closing the opening of the recess 11a; a power receiving coil 13 that receives power transmitted from a power transmission coil 22a; and a circuit board 14 having a light emitting portion 14a that emits light using the power received by the power receiving coil 13, disposed on the outer peripheral side of the recess 11a in the main body portion 11; and the circuit board 14 extends along the outer peripheral side of the recess 11a with the surface provided with the light emitting portion 14a facing radially outward of the main body portion 11.

[0044] In addition, the medical device of the present embodiment, that is, the medical device 1 includes: an extracorporeal unit 20 having a power transmission coil 22a for transmitting power; and a medical device 10 having a power receiving coil 13 for receiving power transmitted from the extracorporeal unit 20, implanted into a living body; and the medical device 10 includes: a main body portion 11 having a recess 11a with an open top surface and extending in the thickness direction, capable of storing a liquid in the recess 11a; a lid portion 12 formed of a soft member that can be pierced by an injection needle, closing the opening of the recess 11a; and a circuit board 14 having a light emitting portion 14a that emits light using the power received by the power receiving coil 13, disposed on the outer peripheral side of the recess 11a in the main body portion 11; and the circuit board 14 extends along the outer peripheral side of the recess 11a with the surface provided with the light emitting portion 14a facing radially outward of the main body portion 11.

[0045] Thereby, the width direction of the circuit board 14 faces the thickness direction of the main body portion 11. In a state where the circuit board 14 is mounted on the main body portion 11, the outer diameter dimension of the circuit board 14 in the radial direction of the main body portion 11 can be reduced, so that a mounting surface for the light emitting portion 14a can be ensured, and miniaturization of the radial dimension of the main body portion 11 can be achieved.

[0046] In addition, preferably, in the light emitting portion 14a, the direction in which light is emitted, that is, the irradiation direction, faces upward of the main body portion 11 in a state where the circuit board 14 is disposed on the outer peripheral side of the recess 11a.

[0047] Thereby, in a state where the medical device 10 is implanted into a living body, the light emitted from the light emitting portion 14a can directly reach the surface of the living body, so that the lid portion 12 can be reliably visually confirmed from the outside of the living body.

[0048] In addition, preferably, the power receiving coil 13 is disposed between the lid portion 12 and the circuit board 14.

[0049] Accordingly, the power receiving coil 13 and the circuit board 14 can be formed as a single component, thereby reducing the man-hours in the assembly operation.

[0050] Figure 4 FIG. is a side sectional view of a medical device, showing another embodiment of the present invention. In addition, the same reference numerals are used to denote the same components as those in the foregoing embodiment.

[0051] In the medical device 10 of the present embodiment, with the circuit board 14 mounted on the main body portion 11, the power receiving coil 13 is disposed on the outer peripheral side of the circuit board 14 and below a plurality of light emitting portions 14a disposed on the outer peripheral surface of the circuit board 14. The power receiving coil 13 of the present embodiment is formed in a ring shape having an inner diameter dimension larger than that of the circuit board 14 in a state of being mounted on the main body portion 11. The power receiving coil 13 is formed, for example, by winding a wire having an outer diameter of 0.2 mm four times in the radial direction and three times in the axial direction, so as to form a ring shape having a thickness of about 0.8 mm and an axial length of 0.6 mm.

[0052] In the medical device 10 configured as described above, the light emitted from each of the plurality of light emitting portions 14a is irradiated upward in the thickness direction of the main body portion 11 and reaches the outer peripheral portion of the lid portion 12 on the surface of the living body, so that the position of the lid portion 12 can be determined, as in the foregoing embodiment.

[0053] Thus, according to the medical device and the medical apparatus of the present embodiment, as in the foregoing embodiment, the width direction of the circuit board 14 faces the thickness direction of the main body portion 11, and in a state where the circuit board 14 is mounted on the main body portion 11, the outer diameter dimension of the circuit board 14 in the radial direction of the main body portion 11 can be reduced, so that a mounting surface for the light emitting portions 14a can be ensured and miniaturization of the radial dimension of the main body portion 11 can be achieved.

[0054] In addition, preferably, the power receiving coil 13 is disposed on the outer peripheral side of the circuit board 14.

[0055] Accordingly, the power receiving coil 13 and the circuit board 14 can be formed as a single component, thereby reducing the man-hours in the assembly operation.

[0056] In addition, in the foregoing embodiment, it is shown that the width direction of the circuit board 14 faces parallel to the thickness direction of the main body portion 11, but it is not limited thereto. The width direction of the circuit board does not need to be strictly parallel to the thickness direction of the main body portion, and may be inclined with respect to the thickness direction of the main body portion.

[0057] In addition, in the foregoing embodiment, the circuit board 14 is shown to have the following length, that is, in a state of being mounted on the main body portion 11, it forms an arc-shaped length that surrounds a part of the outer peripheral side of the concave portion 11a. However, it is not limited thereto, and it may also be set to a circular length that surrounds the outer peripheral side of the concave portion 11a in the entire circumference.

[0058] In addition, in the foregoing embodiment, as the light-emitting portion 14a, an LED is shown. However, as long as it is a component that emits light by using the power received by the power receiving coil 13, it is not limited to an LED.

[0059] In addition, in the foregoing embodiment, it is shown that by arranging a plurality of light-emitting portions 14a at intervals on the outer peripheral side of the lid portion 12, the position of the lid portion 12 can be determined. However, it is not limited thereto. As long as it is a light-emitting portion that can determine the position of the lid portion, for example, it may also be a single light-emitting portion that emits light in a circular shape so as to surround the outer peripheral side of the lid portion.

[0060] In addition, in the foregoing embodiment, it is shown that power is transmitted from the extracorporeal unit 20 to the medical device 10 by so-called magnetic resonance in which a resonance circuit is formed on the circuit board 14. However, power may also be transmitted by electromagnetic induction.

[0061] Here, the power received in the power receiving circuit formed in the medical device is AC regardless of whether power is transmitted by electromagnetic induction or by magnetic resonance. In the case of efficiently causing an LED to emit light by using the power received from the power transmission coil, it is possible to consider forming a full-wave rectifier circuit in the power receiving circuit to perform full-wave rectification and convert it to DC, or connecting a plurality of LEDs having a rectifying function in parallel with the power receiving circuit, connecting a part of the plurality of LEDs in the forward direction of the power receiving circuit, and connecting the other LEDs in the reverse direction.

[0062] When the number of LEDs connected to the power receiving circuit is even, as shown in Figure 6 by making the number of LEDs connected in the forward direction of the power receiving circuit the same as the number of LEDs connected in the reverse direction, the brightness of each LED can be made uniform. As a result, the number of components constituting the power receiving circuit becomes smaller, so that a reduction in manufacturing cost can be achieved. In addition, by adjusting the magnitude of the resistor provided in the power receiving circuit, the brightness of a part of the LEDs can be changed.

[0063] In addition, when the number of LEDs connected to the power receiving circuit is odd, if the brightness of each of the plurality of LEDs can be different, as shown in Figure 7 different numbers of LEDs can be connected in the forward and reverse directions of the power receiving circuit.

[0064] In addition, the plurality of LEDs connected to the power receiving circuit may be as shown in Figure 6 andFigure 7 As shown, it can be connected in parallel with the power receiving circuit, or as Figure 8 shown, in series. Among them, regarding the multiple LEDs connected to the power receiving circuit, since the voltage required for lighting is high when connected in series with the power receiving circuit, it is preferably connected in parallel with the power receiving circuit.

[0065] In addition, when the number of LEDs connected to the power receiving circuit is odd, if the brightness of each of the multiple LEDs is to be made uniform, as long as Figure 9 shown, by arranging four diodes in a bridge shape on the power receiving circuit to form a full-wave rectifier circuit. The diodes used in this case are preferably diodes with a low conduction (ON) voltage such as Schottky barrier diodes.

[0066] In addition, the power receiving coil 13 and the circuit board 14 can also be surface-treated with a coating material. The coating material used in this case is preferably transparent to visible light and has high biocompatibility.

[0067] In addition, when connecting the power receiving coil 13 to the circuit board 14, the end of the wire constituting the power receiving coil 13 can be directly connected to the printed wiring of the circuit board 14, but it can also be as Figure 10 and Figure 11 shown, form a through hole 14b on the circuit board 14, and connect the end 13a of the wire of the power receiving coil 13 to the printed wiring of the circuit board 14 via the through hole 14b. In this case, since the wire of the power receiving coil 13 does not protrude from the surface of the circuit board 14, the exclusive space of the power receiving coil 13 and the circuit board 14 can be reduced, thereby enabling miniaturization of the medical device 10. In addition, when connecting the power receiving coil 13 to the circuit board 14, instead of forming a through hole 14b on the circuit board 14, a cutout portion that cuts the width direction end of the circuit board 14 into a semicircle, for example, can be formed and connected to the printed wiring of the circuit board 14 via the cutout portion. Here, when connecting the power receiving coil 13 to the circuit board 14, the connection position of the wire of the power receiving coil 13 to the strip-shaped circuit board 14 can be the end in the long side direction of the circuit board 14 or the middle portion.

[0068] In addition, the circuit board 14 is not limited to surrounding a part of the outer peripheral portion of the power receiving coil 13, and can also be as Figure 12 shown, surround the entire circumference of the outer peripheral portion of the power receiving coil 13. In this case, as Figure 12 and Figure 13As shown, through holes 14b are formed on both end sides in the long side direction of the circuit board 14. In a state where the through holes 14b on both end sides in the long side direction are overlapped with each other, the wires of the power receiving coil 13 are connected to the printed wiring of the circuit board 14 via the through holes 14b. Thereby, the annular shape of the circuit board 14 can be maintained, and thus the assembly operation of the medical device 10 can be easily performed.

[0069] Reference numeral

[0070] 1 Medical device

[0071] 10 Medical instrument

[0072] 11 Main body part

[0073] 11a Recess

[0074] 12 Cover part

[0075] 13 Power receiving coil

[0076] 14 Circuit board

[0077] 14a Light emitting part

[0078] 20 External unit of living body

[0079] 22a Power transmission coil

Claims

1. A medical device is implanted into a living body and includes: A main body portion having a recess with an open top surface and extending in the thickness direction, capable of storing a liquid in the recess; A lid portion made of a soft component that can be pierced by an injection needle, closing the opening of the recess; A power receiving coil that receives power transmitted from a power transmitting coil; and A circuit board having a light emitting portion that emits light using the power received by the power receiving coil on one surface thereof, and is disposed on the outer peripheral side of the recess in the main body portion; and The circuit board extends along the outer peripheral side of the recess in a posture where the surface provided with the light emitting portion faces radially outward of the main body portion.

2. The medical device according to claim 1, wherein, In the light emitting portion, the direction in which light is emitted, that is, the irradiation direction, faces upward of the main body portion in a state where the circuit board is disposed on the outer peripheral side of the recess.

3. The medical device according to claim 1, wherein, The power receiving coil is disposed between the lid portion and the circuit board.

4. The medical device according to claim 1, wherein, The power receiving coil is disposed on the outer peripheral side of the circuit board.

5. A medical device includes: an extracorporeal unit having a power transmitting coil for transmitting power; and a medical device having a power receiving coil for receiving power transmitted from the extracorporeal unit and implanted into a living body; and The medical device includes: A main body portion having a recess with an open top surface and extending in the thickness direction, capable of storing a liquid in the recess; A lid portion made of a soft component that can be pierced by an injection needle, closing the opening of the recess; and A circuit board having a light emitting portion that emits light using the power received by the power receiving coil on one surface thereof, and is disposed on the outer peripheral side of the recess in the main body portion; and The circuit board extends along the outer peripheral side of the recess in a posture where the surface provided with the light emitting portion faces radially outward of the main body portion.

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