Medical instrument and medical device

Abstract

Provided are a medical instrument and a medical device that ensure a mounting surface for a light-emitting part but reduce the size of a body part in the radial direction. A medical instrument 10 to be embedded in a living body includes a body part 11 having a recess 11a opening upward and extending in the thickness direction and capable of receiving liquid in the recess 11a, a lid part 12 comprising a soft member pierced by an injection needle and closing the opening of the recess 11a, a power receiving coil 13 receiving the power received from a power transmitting coil 22a, and a circuit board 14 mounted on the outer peripheral side of the recess 11a of the body part 11 and having disposed on a surface thereof a light emitting part 14a emitting light using the power received from the power receiving coil 13.The circuit board 14 extends along the outer peripheral side of the recess 11a so that the surface on which the light-emitting part 14a is arranged is directed in the radial direction to the outside of the body part 11.

Description

TECHNICAL FIELD

[0001] The invention mentioned here relates to a medical device and a medical instrument that is implanted into a living body. STATE OF THE ART

[0002] A conventionally known medical instrument for implantation into a living body is arranged with a main body having a depressed portion extending in the thickness direction and having a top surface with an opening and capable of storing a liquid in the depressed portion, a lid part formed of a soft member through which an injection needle can be inserted and which closes the opening of the depressed portion of the main body, a power receiving coil receiving power transmitted from a power transmitting coil, and a circuit board arranged in the main body at a position on the outer peripheral side of the depressed portion and having a surface on which a light emitting unit for emitting light using the power received from the power receiving coil is arranged (see, for example, Patent Document 1).

[0003] Bringing an extra-living body unit having the power transmitting coil near the medical instrument implanted in a living body causes power to be transmitted from the power transmitting coil to the power receiving coil and thus the light emitting unit to emit light, so that the position of the lid part outside the living body can be identified by means of the light emitted from the light emitting unit. Citation listPatent document

[0004] Patent Document 1: PCT International Publication No. WO2022 / 102393 DISCLOSURE OF THE INVENTION Problems to be solved by the invention

[0005] A medical instrument for implantation into a living body is configured such that: a circuit board mounted in a main body extends in the radial direction of the main body; and a light-emitting unit is mounted on top of the circuit board, which extends in the radial direction of the main body. Thus, the main body of the medical instrument is formed to have a radial size such that a circuit board on which the light-emitting unit can be mounted can be mounted. Meanwhile, the main body of the medical instrument for implantation into a living body must have a reduced radial size to reduce invasiveness in the living body.

[0006] The object of the invention mentioned herein is to provide a medical instrument and a medical device that provides a surface for a light emitting unit and allows a main body to have a reduced radial size. Devices to solve the problems

[0007] A medical instrument according to the present invention is implanted into a living body and includes a main body having a depressed portion extending in the thickness direction and having a top surface with an opening and capable of storing a liquid in the depressed portion, a lid member formed of a soft member through which an injection needle can be inserted and which closes the opening of the depressed portion, a power receiving coil receiving power transmitted from a power transmitting coil, and a circuit board disposed in the main body at a position on the outer peripheral side of the depressed portion and having a surface on which a light emitting unit for emitting light using the power received from the power receiving coil is disposed.wherein the circuit board extends along the outer peripheral side of the recessed portion in such a position that the surface on which the light emitting unit is arranged is directed outward in the radial direction of the main body.,

[0008] In the medical instrument according to the present invention, an emission direction in which the light is emitted from the light emission unit is directed to a region above the main body, and the circuit board is arranged on the outer peripheral side of the recessed portion.

[0009] In the medical instrument mentioned here, the current receiving coil is arranged between the cover part and the circuit board.

[0010] In the medical instrument according to the invention mentioned here, the current receiving coil is arranged on the outer peripheral side of the circuit board.

[0011] A medical device according to the present invention includes an external unit having a power transmission coil for transmitting power, and a medical instrument having a power reception coil for receiving the power transmitted from the external unit and intended to be implanted into a living body, wherein the medical instrument includes a main body having a depressed portion extending in the thickness direction and having a top surface with an opening and capable of storing a liquid in the depressed portion, a lid member formed of a soft member through which an injection needle can be inserted and which closes the opening of the depressed portion, and a circuit board,which is arranged in the main body at a location on the outer peripheral side of the recessed portion and has a surface on which a light-emitting unit for emitting light by means of the current received from the current receiving coil is arranged, and the circuit board extends along the outer peripheral side of the recessed portion in such a position that the surface on which the light-emitting unit is arranged faces outward in the radial direction of the main body. Effects of the invention

[0012] In the invention mentioned here, the width direction of the circuit board is oriented in the thickness direction of the main body, and the outer diameter size of the circuit board in the radial direction of the main body can be small when the circuit board is attached to the main body, so that a mounting area for the light emitting unit can be ensured while the main body can have a reduced radial size. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a side cross-sectional view of a medical device according to an embodiment of the invention herein; Fig. 2 is a perspective view of a medical instrument according to an embodiment of the present invention; Fig. 3 is an exploded perspective view of a medical instrument according to an embodiment of the present invention; Fig. 4 is a schematic view of a printed circuit board according to an embodiment of the present invention; Fig. 5 is a side cross-sectional view of a medical instrument according to another embodiment of the present invention; Fig. 6 is a circuit diagram showing an example of the power receiving circuit of the medical device mentioned here; Fig. 7 is a circuit diagram showing another example of the power receiving circuit of the medical instrument of the present invention; Fig. 8 is a circuit diagram showing another example of the power receiving circuit of the medical instrument of the present invention; Fig. 9 is a circuit diagram showing another example of the power receiving circuit of the medical instrument of the present invention; Fig. 10 is a side cross-sectional view of a main portion illustrating the structure of the connection between the power receiving coil and the circuit board of the present invention; Fig. 11 is a side view of a main portion illustrating the structure of the connection between the power receiving coil and the circuit board of the present invention; Fig. 12 is a cross-sectional view showing the structure of the connection between the current receiving coil and the circuit board of the present invention; and Fig. Fig. 13 is a side view of a main portion illustrating the structure of the connection between the power receiving coil and the circuit board of the present invention. ADVANTAGEOUS EMBODIMENT OF THE INVENTION

[0013] In the Fig. 1 to 3 show an embodiment of the invention mentioned here. Fig. 1 is a side cross-sectional view of the medical device. Fig. 2 is a perspective view of the medical instrument. Fig. 3 is an exploded perspective view of the medical instrument.

[0014] As in Fig. 1, a medical device 1 of the embodiment mentioned here comprises a medical instrument 10 which is used in a state in which it is implanted in a living body, for example, a human or an animal, and a unit 20 located outside the living body for supplying power to the medical instrument 10. The medical device 1 supplies power to the medical instrument 10 from the unit 20 located outside the living body in a contactless manner.

[0015] The medical instrument 10 is a subcutaneous port (CV port), i.e., a type of central venous catheter, for injecting a medical solution into a central vein near the heart of a living body. As shown in Fig. 1 to 3, the medical instrument 10 includes: a main body 11 having a recessed portion 11a in which a liquid, such as a medical solution, can be stored; a lid member 12 closing the opening of the recessed portion 11a of the main body 11; a power receiving coil 13 receiving power sent from the living body external unit 20; a circuit board 14 disposed in the main body 11 at a position on the outer peripheral side of the recessed portion 11a and having a surface on which a plurality of light emitting units 14a for emitting light using the power received from the power receiving coil 13 are disposed; and a catheter (not shown) having one end communicating with the recessed portion 11a of the main body 11 and the other end to be inserted into a central vein of the living body.

[0016] For example, the main body 11 is made of a resinous material such as polyphenylene sulfide (PPS), polyethersulfone (PES), or polyetheretherketone (PEEK) and formed in a substantially truncated cone shape. The main body 11 has formed therein the depressed portion 11a, which has a top surface with an opening and extends straight toward the lower surface side. A liquid is stored in the depressed portion 11a. The main body 11 is formed of an upper side part 11b and a lower side part 11c. The power receiving coil 13 and the circuit board 14 are housed in a space 11d formed between the upper side part 11b and the lower side part 11c. The space 11d extends to assume a ring shape surrounding the outer peripheral side of the depressed portion 11a.The lower side part 11c has a fluid circulation channel 11c1 arranged to extend from the bottom toward the outer peripheral side of the recessed portion 11a, through which the fluid stored in the recessed portion 11a circulates. One end of the catheter is connected to the fluid circulation channel 11c1. The recessed portion 11a can also be referred to, for example, as a medical solution container.

[0017] The lid part 12 is formed of a soft member, such as silicone rubber, through which an injection needle can be repeatedly inserted. The lid part 12 has a columnar lid body 12a and a flange portion 12b that is circumferentially arranged entirely on the outer peripheral portion of the lid body 12a and extends outward. The lid body 12a is a portion through which an injection needle is repeatedly inserted from the outside of the living body. The flange portion 12b is a portion located in the space 11d of the main body 11.

[0018] For example, the power receiving coil 13 is formed by repeatedly winding a conductive copper wire into a ring shape having an inner diameter larger than the outer diameter of the flange portion 12b of the cover member 12. For example, the power receiving coil 13 is formed into a ring shape with a thickness of approximately 0.4 mm and a length of approximately 1.2 mm in the axial direction by winding a conductive wire with an outer diameter of 0.2 mm in the radial direction to form two loops and by winding the same in the axial direction to form six loops. The power receiving coil 13 is arranged between the cover member 12 and the circuit board 14.

[0019] The printed circuit board 14 is a so-called flexible board formed by printing a wire, such as a copper foil, onto an insulator made of a film-like resin material. The printed circuit board 14 is formed in the shape of a flexible strip. For example, the thickness of the film-like insulator of the printed circuit board 14 is about 0.05 mm. The thickness of the smallest portion of the printed circuit board 14 is, for example, 0.1 mm. One surface of the printed circuit board 14 has a plurality of light-emitting units 14a mounted at intervals and a resonance circuit (not shown) to which the plurality of light-emitting units 14a are connected. The printed circuit board 14 has a widthwise size such that the light-emitting units 14a can be mounted thereon. The current receiving coil 13 is connected to the printed circuit board 14. The current received by the current receiving coil 13 is supplied to each of the plurality of light-emitting units 14a.Further, the circuit board 14 extends along the outer peripheral side of the recessed portion 11a in such a position that the surface on which the plurality of light-emitting units 14a are arranged faces outward in the radial direction of the main body 11, and the circuit board 14 is attached to the main body 11. As shown in FIG. Fig. 3, the circuit board 14 assumes an arc shape surrounding a portion of the recessed portion 11a on the outer peripheral side, the circuit board 14 being attached to the main body 11.

[0020] If the flexible board circuit board 14 is formed into an arc shape to enclose the recessed portion 11a, this results in a loss of flexibility of the portions of the circuit board 14 on which rigid electronic components, such as the light-emitting units 14a, are mounted. Therefore, the flexible board circuit board 14 is preferably formed as shown in Fig. 4: the portions on which the rigid electronic components are mounted are straight; and the portions other than the portions on which the rigid electronic components are mounted are formed in an arc shape.

[0021] For example, each of the plurality of light-emitting units 14a is a light-emitting diode (LED) that emits light by applying a voltage thereto. The plurality of light-emitting units 14a are each mounted on the circuit board 14 so that an emission direction in which light is emitted is directed toward a region above the main body 11, with the circuit board 14 being disposed on the outer peripheral side of the recessed portion 11a.

[0022] As in Fig. 1, the extra-living body unit 20 includes a casing 21 sized to allow a person to grasp it by hand, and a power transmission unit 22 disposed within the casing 21. For example, the power transmission unit 22 includes a power transmission coil 22a formed by repeatedly winding a conductive copper wire in a ring shape, and a resonance circuit (not shown) to which the power transmission coil 22a is connected. Bringing the extra-living body unit 20 close to the medical instrument 10 causes resonance between the power transmission coil 22a of the power transmission unit 22 and the power reception coil 13 of the medical instrument 10, thereby transmitting power from the power transmission coil 22a to the power reception coil 13.

[0023] In the medical device 1 configured as described above, the medical instrument 10 is used in a state where it is implanted in a living body. A liquid, such as a medical solution, to be administered into the living body is injected into the depressed portion 11a of the main body 11 via an injection needle, such as a Huber-tipped needle, inserted from the outside of the living body through the lid member 12. The liquid injected into the depressed portion 11a of the main body 11 is guided through the liquid circulation channel 11c1, circulates through a catheter, and is administered into a central vein of the living body.

[0024] For the medical instrument 10 implanted in the living body, the position of the cover part 12 in the living body must be identified when the injection needle is inserted through the cover part 12. Thus, when the injection needle is inserted through the cover part 12 of the medical instrument 10 implanted in the living body, the external unit 20 is brought from the outside of the living body to the vicinity of the portion where the medical instrument 10 is implanted, and current is caused to flow through the current transmission coil 22a.As a result, the power transmission coil 22a of the external living body unit 20 is brought close to the power reception coil 13 of the medical instrument 10, so that power is transmitted from the power transmission coil 22a to the power reception coil 13, and the plurality of light emission units 14a emit light using the power received by the power reception coil 13. The plurality of light emission units 14a each emit light to a region above the main body 11, so that the light is emitted upward from the outer peripheral side of the lid part 12, and thus the light arrives at the outer portion of the lid part 12 on the surface of the living body, whereby the position of the lid part 12 can be identified.Under this condition, the injection needle can be reliably inserted through the lid part 12 by inserting the injection needle with a portion surrounded by the plurality of light-emitting units 14a as the target. Meanwhile, the current receiving coil 13 and the circuit board 14 are located on the lid part 12 side of the plurality of light-emitting units 14a. Accordingly, the light emitted by the light-emitting units 14a is blocked by the current receiving coil 13 and the circuit board 14 and thus does not reach the lid part 12 side, and the outline of the lid part 12 can be clearly seen from outside the living body.

[0025] As described above, according to the medical instrument of the embodiment described above, a medical instrument 10 for implantation into a living body comprises a main body 11 having a depressed portion 11a extending in the thickness direction and having a top surface with an opening and capable of storing a liquid in the depressed portion 11a, a lid member 12 formed of a soft member through which an injection needle can be inserted and which closes the opening of the depressed portion 11a, a current receiving coil 13 receiving current transmitted from a current transmitting coil 22a, and a circuit board 14 disposed in the main body 11 at a position on the outer peripheral side of the depressed portion 11a and having a surfaceon which a light-emitting unit 14a for emitting light by means of the current received by the current receiving coil 13 is arranged, wherein the circuit board 14 extends along the outer peripheral side of the recessed portion 11a in such a position that the surface on which the light-emitting unit 14a is arranged is directed outwards in the radial direction of the main body 11.

[0026] The medical device of the present embodiment is a medical device 1 including an extra-living body unit 20 having a power transmission coil 22a for transmitting power, and a medical instrument 10 having a power reception coil 13 for receiving the power transmitted from the extra-living body unit 20 and intended to be implanted into a living body. The medical instrument 10 includes a main body 11 having a depressed portion 11a extending in the thickness direction and having a top surface with an opening and capable of storing a liquid in the depressed portion 11a, a lid member 12 formed of a soft member through which an injection needle can be inserted and which closes the opening of the depressed portion 11a, and a circuit board 14.which is arranged in the main body 11 at a location on the outer peripheral side of the recessed portion 11a and has a surface on which a light-emitting unit 14a for emitting light by means of the current received from the current receiving coil 13 is arranged, and the circuit board 14 extends along the outer peripheral side of the recessed portion 11a in such a position that the surface on which the light-emitting unit 14a is arranged faces outward in the radial direction of the main body 11.

[0027] Accordingly, the width direction of the circuit board 14 is aligned with the thickness direction of the main body 11, and the outer diameter size of the circuit board 14 in the radial direction of the main body 11 can be small when the circuit board 14 is attached to the main body 11, so that a mounting area for the light emitting unit 14a can be ensured while the main body 11 can have a reduced radial size.

[0028] In the light emitting units 14a, the emission direction in which the light is emitted is preferably directed to a region above the main body 11, with the circuit board 14 being arranged on the outer peripheral side of the recessed portion 11a.

[0029] Thereby, the light emitted from the light emitting unit 14a can directly hit the surface of the living body with the medical instrument 10 implanted in the living body, so that the cover part 12 can be reliably observed from outside the living body.

[0030] The current receiving coil 13 is preferably arranged between the cover part 12 and the circuit board 14.

[0031] In this way, the current receiving coil 13 and the circuit board 14 can be formed as a single component, and the man-hours of assembly can be reduced.

[0032] Fig. Figure 4 illustrates another embodiment of the present invention and is a cross-sectional side view of a medical instrument. Components identical to those of the above-mentioned embodiment are designated by the same reference numerals.

[0033] With respect to a medical instrument 10 of the present embodiment, a current receiving coil 13 is disposed on the outer peripheral side of a circuit board 14, the circuit board 14 being attached to a main body 11, and the medical instrument 10 is arranged below a plurality of light emitting units 14a arranged on the outer peripheral surface of the circuit board 14. The current receiving coil 13 in the present embodiment is formed into a ring having a larger inner diameter than the circuit board 14 when attached to the main body 11.For example, the power receiving coil 13 is formed in a ring shape having a thickness of about 0.8 mm and a length of about 0.6 mm in the axial direction by winding a conductive wire having an outer diameter of 0.2 mm in the radial direction to form four loops and by winding the same in the axial direction to form three loops.

[0034] In the medical instrument 10 thus configured as in the above-described embodiment, the light emitted from each of the plurality of light emitting units 14a travels toward a region above the main body 11 in the thickness direction and arrives at the outer peripheral portion of the lid member 12 on the surface of a living body, whereby the position of the lid member 12 can be identified.

[0035] It should be noted that according to the medical instrument and the medical device of the embodiment mentioned here, the width direction of the circuit board 14 is aligned in the thickness direction of the main body 11, and the outer diameter size of the circuit board 14 in the radial direction of the main body 11 can be small when the circuit board 14 is attached to the main body 11, so that a surface for the light emitting unit 14a can be ensured while the main body 11 can have a reduced radial size.

[0036] The current receiving coil 13, on the other hand, is preferably arranged on the outer peripheral side of the circuit board 14.

[0037] In this way, the current receiving coil 13 and the circuit board 14 can be formed as a single component, and the man-hours in the assembly work can be reduced.

[0038] In the embodiment described above, the orientation of the circuit board 14 in the width direction is parallel to the thickness direction of the main body 11. However, the invention mentioned here is not limited to this. The orientation of the circuit board in the width direction does not have to be exactly parallel to the thickness direction of the main body, but may be inclined with respect to the thickness direction of the main body.

[0039] In the above-described embodiment, the circuit board 14 has a length such that it assumes an arc shape surrounding a portion of the recessed portion 11a on the outer peripheral side, and the circuit board 14 is attached to the main body 11. However, the invention mentioned herein is not limited to this, and the circuit board 14 may have a length such that it assumes a ring shape completely surrounding the outer peripheral side of the recessed portion 11a.

[0040] In the above-mentioned embodiment, an LED is specified as the light-emitting unit 14a. However, the light-emitting unit 14a is not limited to an LED as long as it emits light using the current received from the current receiving coil 13.

[0041] In the above-mentioned embodiment, a plurality of light-emitting units 14a are mounted at intervals on the outer peripheral side of the lid part 12 so that the position of the lid part 12 can be identified. However, the invention herein is not limited to this. For example, a light-emitting unit that emits light in a ring shape surrounding the outer peripheral side of the lid part may be used, as long as it allows the position of the lid part to be identified.

[0042] In the above-mentioned embodiment, current is transmitted from the extra-human unit 20 to the medical instrument 10 by means of so-called magnetic resonance, which is generated by a resonant circuit formed on the circuit board 14. However, the current can also be transmitted by electromagnetic induction.

[0043] In this regard, a power receiving circuit formed in the medical instrument receives alternating current, regardless of whether the current is transmitted by electromagnetic induction or magnetic resonance. In order for LEDs to efficiently emit light using the current received by the power transmission coil, a full-wave rectification circuit may be formed in the power receiving circuit to convert the current into direct current through full-wave rectification, or a plurality of LEDs with rectification action may be connected in parallel with the power receiving circuit, so that some of the plurality of LEDs are connected in the forward direction of the power receiving circuit, while the other LEDs are connected in the reverse direction.

[0044] If an even number of LEDs are connected to the current receiving circuit, the LEDs can be equal in brightness by, as in Fig. As shown in Figure 6, the number of LEDs connected in the forward direction of the current receiving circuit is equal to the number of LEDs connected in the reverse direction. This allows the current receiving circuit to be formed from fewer components, thereby reducing manufacturing costs. Meanwhile, the brightness of some LEDs can be changed by adjusting the size of a resistor to be installed in the current receiving circuit.

[0045] In the case where an odd number of LEDs are connected to the current receiving circuit and the plurality of LEDs need not have the same brightness, the number of LEDs connected in the forward direction of the current receiving circuit may be different from that in the reverse direction, as shown in Fig. 7 shown.

[0046] The plurality of LEDs can be connected in parallel to the current receiving circuit as shown in the Fig. 6 and Fig. 7, or in series with it, as in Fig. 8. However, preferably, the plurality of LEDs are connected in parallel to the current receiving circuit, since a high voltage would be required to emit light if they were connected in series to the current receiving circuit.

[0047] In the case where an odd number of LEDs are connected to the current receiving circuit, in order to make the plurality of LEDs equally bright, a full-wave rectifier circuit can be formed by, as shown in Fig. As shown in Figure 9, four diodes are arranged in a bridge configuration in the current receiving circuit. Diodes with low ON voltage, such as Schottky barrier diodes, are preferably used.

[0048] The current receiving coil 13 and the circuit board 14 can be surface-treated with a coating material. Advantageously, the coating material used in this case is transparent to visible light and has high biocompatibility.

[0049] In order to connect the current receiving coil 13 to the circuit board 14, an end portion of the conductive wire forming the current receiving coil 13 may be directly connected to a printed wire of the circuit board 14, or, as shown in Fig. 10 and Fig. As shown in FIG. 11, a through-hole 14b may be formed in the circuit board 14, and an end portion 13a of the conductive wire of the power receiving coil 13 may be connected to a printed wire of the circuit board 14 via the through-hole 14b. In this case, the conductive wire of the power receiving coil 13 does not protrude from the surface of the circuit board 14, so that the spaces occupied by the power receiving coil 13 and the circuit board 14 can be reduced, and the medical instrument 10 can be smaller in size. Alternatively, to connect the power receiving coil 13 to the circuit board 14, a notch portion that notches a widthwise end portion of the circuit board 14 into, for example, a semicircular shape may be formed without forming the through-hole 14b in the circuit board 14, and the power receiving coil 13 may be connected to a printed wire of the circuit board 14 via the notch portion.When connecting the current receiving coil 13 to the circuit board 14, the position where the conductive wire of the current receiving coil 13 is connected to the strip-shaped circuit board 14 may be an end portion or an intermediate portion of the circuit board 14 in the longitudinal direction.

[0050] The circuit board 14 is not limited to a circuit board that partially surrounds the outer portion of the current receiving coil 13, but may be a circuit board that completely surrounds the outer portion of the current receiving coil 13, as shown in Fig. 12. In this case, as shown in the Fig. 12 and Fig.13, through-holes 14b are formed on both ends of the circuit board 14 in the longitudinal direction, and the conductive wire of the current receiving coil 13 is connected to a printed wire of the circuit board 14 via the through-holes 14b, with the through-holes 14b overlapping each other on both sides in the longitudinal direction. This allows the ring shape of the circuit board 14 to be maintained, facilitating the assembly of the medical instrument 10. EXPLANATION OF REFERENCE SYMBOLS 1 Medical device 10 Medical instrument 11 Main body 11a In-depth section 12 Lid part 13 Current receiving coil 14 circuit board 14a Light emission unit 20 Unit located outside the living body 22a power transmission coil QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] WO 2022 / 102393

[0004]

Claims

[1] A medical instrument for implantation into a living body, the medical instrument comprising: a main body having a depressed portion extending in a thickness direction and having a top with an opening, and capable of storing a liquid in the depressed portion; a lid part formed of a soft member through which an injection needle can be inserted and which closes the opening of the depressed portion; a current receiving coil that receives current sent from a current transmitting coil; and a circuit board arranged in the main body at a position on an outer peripheral side of the recessed portion and having a surface on which a light emitting unit for emitting light by means of the current received by the current receiving coil is arranged, wherein the circuit board extends along the outer peripheral side of the recessed portion in such a position that the surface on which the light emitting unit is arranged is oriented outward in a radial direction of the main body. [2] The medical instrument according to claim 1, wherein an emission direction in which light is emitted from the light-emitting unit is directed to an area above the main body, the circuit board being arranged on the outer peripheral side of the recessed portion. [3] The medical instrument according to claim 1, wherein the current receiving coil is arranged between the cover part and the circuit board. [4] The medical instrument according to claim 1, wherein the current receiving coil is arranged on an outer peripheral side of the circuit board. [5] A medical device comprising an extra-living body unit having a current transmitting coil for transmitting current, and a medical instrument having a current receiving coil for receiving the current transmitted from the extra-living body unit, the medical instrument being to be implanted in a living body, the medical instrument comprising: a main body having a depressed portion extending in a thickness direction and having a top with an opening, and capable of storing a liquid in the depressed portion, a lid part formed of a soft element through which an injection needle can be inserted and which closes the opening of the depressed portion, and a circuit board arranged in the main body at a position on an outer peripheral side of the recessed portion and having a surface on which a light emitting unit for emitting light by means of the current received by the current receiving coil is provided, wherein the circuit board extends along the outer peripheral side of the recessed portion in such a position that the surface on which the light emitting unit is arranged is oriented outward in a radial direction of the main body.

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