WO2016071983A1

WO2016071983A1 - Trocar and medical wireless power feeding system

Info

Publication number: WO2016071983A1
Application number: PCT/JP2014/079430
Authority: WO
Inventors: 松木　薫; 勇太杉山
Original assignee: オリンパス株式会社
Priority date: 2014-11-06
Filing date: 2014-11-06
Publication date: 2016-05-12

Abstract

A trocar (1) has a housing (8). A puncture needle (5) is connected to a tip part (82) of the housing (8). An insertion hole (6) penetrates through the housing (8) and the puncture needle (5). A power transmission coil (4) is arranged coaxially with the insertion hole (6) on the periphery of the insertion hole (6) in a main body (81) of the housing (8). A cylindrical magnetic body (7) is arranged coaxially with the insertion hole (6) on the periphery of the insertion hole (6) in the tip part (82). A rigid insertion part (21) of a treatment instrument (2) is inserted in the insertion hole (6). A power receiving coil (22) is arranged along the entire length of the insertion part (21). The power transmission coil (4) and the power receiving coil (22) are inductively coupled. Therefore, when an alternating current is supplied to the power transmission coil (4), electric power can be extracted from the power receiving coil (22). Through this configuration, electric power can be wirelessly fed to the treatment instrument (2). Arranging the magnetic body (7) as described above enhances the efficiency of power feeding.

Description

Trocar and medical wireless power supply system

The present invention relates to a trocar having a function of supplying power wirelessly to a medical device and a medical wireless power supply system.

In the case of minimally invasive surgery in which treatment is performed in the abdominal cavity, a plurality of trocars are attached to the abdominal wall, and the treatment tool is introduced into the abdominal cavity through the trocar. In a state where the trocar is integrally combined with an inner needle having a sharp puncture needle at the tip, the inner needle is punctured into the body wall of the patient and inserted into the abdominal cavity. After the trocar is inserted into the abdominal cavity, the trocar is placed on the body wall by removing the inner needle. The trocar is used as a guide tube for a treatment instrument that performs treatment in the abdominal cavity, and the treatment instrument can be introduced into the body through the guide tube.

The treatment instrument inserted into the patient's body through the trocar includes, for example, a treatment instrument using energy, and a cable for supplying power to such a treatment instrument may be connected. With this cable, the operator's operation becomes complicated when performing the operation. For this reason, in order to improve the operativity at the time of an operator operating a treatment tool, it is preferable that there is no cable.

In order to solve this problem, in Patent Document 1, a primary coil (power transmission coil) is disposed on a trocar, a secondary coil (power reception coil) is disposed on a treatment instrument inserted in the trocar, and the treatment instrument is disposed via the trocar. Discloses a surgical instrument that performs wireless power feeding. In the surgical instrument of Patent Document 1, it is disclosed that electric power is wirelessly fed to a secondary coil of a treatment instrument that is magnetically coupled to the primary coil via an alternating magnetic field generated from the primary coil.

Japanese Patent No. 4145395

In the surgical instrument of Patent Document 1, since the power receiving coil arranged in the longitudinal direction of the insertion portion of the treatment instrument can supply power only at a position facing the power transmitting coil, a portion of the power receiving coil that does not face the power transmitting coil is fed. Can not be used for. Therefore, in order to improve the power supply efficiency in the surgical instrument of Patent Document 1, it is necessary to widen the range in which the power transmission coil and the power reception coil face each other. However, since the tip of the trocar is inserted into the body while having an insertion hole, the diameter is small and the thickness is thin, so the size of the power transmission coil is increased in the direction in which the insertion hole extends. There is a limit in terms of. In addition, if the power transmission coil is lengthened in order to widen the power feeding area, an electrical error tends to occur, which is not preferable.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a trocar and a medical wireless power supply system that can improve power supply efficiency for a treatment instrument.

A trocar according to the present invention includes a puncture needle that punctures the surface of a living body, a housing that has an insertion hole that communicates with the distal end of the puncture needle and into which a treatment instrument having a power receiving coil is inserted, and is wound around the insertion hole A power transmission coil magnetically coupled to the power reception coil, and a magnetic body disposed adjacent to the power transmission coil in the axial direction of the power transmission coil.

A medical wireless power feeding system according to the present invention includes a treatment instrument having an insertion portion inserted into the insertion hole and a power receiving coil provided in the insertion portion, and the trocar.

According to the trocar and medical wireless power feeding system of the present invention, it is possible to improve the power feeding efficiency in wireless power feeding to the treatment instrument via the trocar.

1 is a diagram illustrating an overall configuration of a medical wireless power feeding system including a trocar according to a first embodiment of the present invention. It is sectional drawing which shows the state by which the treatment tool was inserted in the trocar which concerns on 1st embodiment of this invention. It is sectional drawing which shows the trocar which concerns on 1st embodiment of this invention. It is a schematic diagram for demonstrating the effect | action of the magnetic body of 1st embodiment of this invention. It is sectional drawing which shows the state by which the treatment tool was inserted in the trocar which concerns on 2nd embodiment of this invention. It is a schematic diagram for demonstrating the effect | action of the magnetic body of 2nd embodiment of this invention. It is a figure which shows the modification of the trocar which concerns on 2nd embodiment of this invention, and is sectional drawing which shows the state by which the treatment tool was inserted in the trocar. It is sectional drawing which showed the effect | action of the trocar of FIG. 7 typically. It is sectional drawing which shows the medical wireless power supply system which concerns on 3rd embodiment of this invention. It is sectional drawing which shows the medical wireless power supply system which concerns on 3rd embodiment of this invention. It is a figure which shows the 1st modification of the treatment tool of 3rd embodiment of this invention, and is sectional drawing which shows the state by which the treatment tool was inserted in the trocar. It is a figure which shows the 2nd modification of the treatment tool of 3rd embodiment of this invention, and is sectional drawing which shows the state by which the treatment tool was inserted in the trocar. It is a figure which shows the 3rd modification of the treatment tool of 3rd embodiment of this invention, and is sectional drawing which shows the state by which the treatment tool was inserted in the trocar. It is a figure which shows the 3rd modification of the treatment tool of 3rd embodiment of this invention, and is sectional drawing which shows the state by which the treatment tool was inserted in the trocar.

[First embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a diagram illustrating an overall configuration of a medical wireless power feeding system 100 including a trocar 1 according to the present embodiment. FIG. 2 is a cross-sectional view showing a state where the treatment tool 2 is inserted into the trocar 1. FIG. 3 is a cross-sectional view showing the trocar 1.

As shown in FIG. 1, the medical wireless power feeding system 100 includes a trocar 1, a treatment instrument 2 inserted into the trocar 1, and a power supply device 3 that supplies power to the trocar 1. In this specification, the puncture needle side where the trocar 1 is inserted into the body wall 200 (the side where the treatment portion of the treatment instrument 2 is provided when the treatment instrument 2 is inserted into the trocar 1) is referred to as the tip, and the trocar 1 The side where the treatment instrument 2 is inserted (the side where the handle 24 of the treatment instrument 2 is located when the treatment instrument 2 is inserted into the trocar 1) will be referred to as the base end.

As shown in FIGS. 2 and 3, the trocar 1 includes a housing 8, a power transmission coil 4, a puncture needle 5, an insertion hole 6, and a magnetic body 7. The housing 8 includes a base end-side main body portion 81 having a substantially cylindrical shape, and a front end portion 82 located on the front end side and having a diameter smaller than that of the main body portion 81. The puncture needle 5 is connected to the distal end portion 82 side of the housing 8. As shown in FIG. 1, the puncture needle 5 is punctured on the living body surface (body wall) in order to attach the trocar 1 to the body wall 200 of the patient P.

An insertion hole 6 extending from the distal end of the trocar 1 to the proximal end is formed in the main body portion 81 and the distal end portion 82 of the housing 8. The insertion hole 6 communicates with the tip of the puncture needle 5, and the treatment instrument 2 is inserted during the procedure. In the present embodiment, the puncture needle 5 is formed integrally with the housing 8 by forming the opening of the insertion hole 6 at the distal end portion 82 of the housing 8 sharply. However, the puncture needle 5 may be a separate body from the housing 8.

The power transmission coil 4 is wound around the insertion hole 6 and arranged. A power transmission capacitor and a connection terminal (not shown) are connected to the power transmission coil 4 in series. The power transmission coil 4 and the power transmission capacitor constitute a series resonance circuit. As shown in FIG. 2, the central axis of the power transmission coil 4 is arranged so as to be coaxial with the central axis A of the insertion hole 6. The power transmission coil 4 may not be coaxial with the central axis A of the insertion hole 6. The power transmission coil 4 and the power transmission capacitor are covered with an insulating member such as resin.

The magnetic body 7 is formed in a cylindrical shape having substantially the same inner diameter as the power transmission coil 4. As a material of the magnetic body 7, for example, a soft magnetic material such as iron, silicon steel, soft ferrite, and permalloy can be used. The magnetic body 7 of the present embodiment is a permalloy cylindrical member having a thickness of 1 mm, and is attached to the inner peripheral surface 61 side of the insertion hole 6 at the distal end portion 82. As shown in FIG. 2, the magnetic body 7 is provided so as to surround the periphery of the insertion hole 6. The magnetic body 7 is disposed adjacent to the power transmission coil 4 in the axial direction of the power transmission coil 4. In the present embodiment, the magnetic body 7 is disposed at the distal end portion 82 of the housing 8. Further, the magnetic body 7 is disposed coaxially with the power transmission coil 4.

With the above arrangement, the inner surface 71 of the magnetic body 7 (the surface facing the insertion hole 6) is arranged at a position that matches the inner diameter of the power transmission coil 4. If the inner surface 71 of the magnetic body 7 is larger than the inner diameter of the power transmission coil 4, the magnetic flux emitted from the power transmission coil spreads, and the effect of increasing the power supply efficiency by maintaining a high magnetic flux density cannot be obtained. Moreover, when the inner surface of the magnetic body 7 is narrower than the inner diameter of the power transmission coil 4, the insertion hole 6 of the trocar 1 becomes small, making it difficult to insert the treatment instrument 2, which hinders the original use of the trocar 1. As described above, the inner diameter of the magnetic body 7 is preferably the same as the inner diameter of the power transmission coil 4.

The treatment instrument 2 includes a rigid insertion portion 21, a power receiving coil 22, a treatment portion 23, and a handle 24, as shown in FIGS. The insertion portion 21 has a long cylindrical shape. The power receiving coil 22 is wound along the long axis direction of the insertion portion 21 and is disposed in the insertion portion 21. The handle 24 is provided on the proximal end side of the insertion portion 21. Since the power receiving coil 22 is provided over the entire length of the insertion portion 21, the range where the power receiving coil 22 exists is longer than the range where the power transmitting coil 4 exists when the power receiving coil 22 is inserted through the trocar 1. The power receiving coil 22 and the treatment unit 23 are connected to each other through a wiring so as to be energized. As shown in FIG. 1, the treatment section 23 of the present embodiment is a bipolar electric knife provided with a pair of treatment electrodes 231.

As shown in FIG. 1, the power supply device 3 includes a cable 31 and a switch 32. The power supply device 3 is electrically connected to the trocar 1 via a cable 31. The switch 32 is connected to the power supply device 3 and is provided to perform an ON / OFF operation on the output of high-frequency power in the power supply device 3. By operating the switch 32, power can be supplied from the power supply device 3 to the power transmission coil 4.

Next, the operation when the medical wireless power feeding system 100 including the trocar 1 according to the present embodiment and the treatment tool 2 is used will be described. First, the operator punctures the body wall 200 of the patient P with the puncture needle of the trocar 1 and attaches the trocar 1 to the body wall 200. Subsequently, when the operator inserts the treatment tool 2 into the insertion hole 6 of the trocar 1, the treatment tool 2 is introduced into the body cavity via the insertion hole 6 of the trocar 1. When the treatment portion 23 is inserted up to the treatment target site, the operator operates the switch 32. Then, high frequency power is supplied from the power supply device 3 to the power transmission coil 4 of the trocar 1. At this time, in the insertion hole 6, the power transmission coil 4 and the power reception coil 22 are magnetically coupled, and AC power is supplied to the power reception coil 22.

The operation of the trocar 1 during power supply will be described with reference to FIG. When AC power having a predetermined frequency is supplied from the power supply device 3 (FIG. 1) to the power transmission coil 4, a magnetic flux M is generated in the power transmission coil 4 as shown in FIG. 4. The magnetic flux density outside the power transmission coil 4 is lower than the magnetic flux density inside the power transmission coil 4. Therefore, the magnetic flux where the power receiving coil 22 and the power transmitting coil 4 cross each other usually decreases greatly when the power transmitting coil 4 and the power receiving coil 22 are out of the opposite positions. However, since the magnetic body 7 is provided adjacent to the power transmission coil 4 in the trocar 1 of the present invention, the magnetic flux M1 is magnetic even outside the power transmission coil 4 as shown by the arrow M1 in FIG. The body 7 is guided in the direction of the central axis A of the insertion hole 6. As a result, the range where the magnetic flux density in the insertion hole 6 is high can be extended longer. Therefore, even at a position where the power receiving coil 22 does not face the power transmitting coil 4, power can be supplied in the same manner as a position where the power receiving coil 22 and the power transmitting coil 4 face each other, and the power feeding efficiency can be improved.

With the alternating current supplied to the power receiving coil 22, the pair of treatment electrodes 231 of the treatment unit 23 come into contact with the treatment target site, so that the alternating current power supplied to the power receiving coil 22 is converted into the pair of treatment electrodes 231. The treatment target region can be treated by the pair of treatment electrodes 231.

Since the trocar 1 according to the present embodiment is provided with the magnetic body 7, more magnetic flux can be guided to the power receiving coil, so that the power receiving coil is not increased in size as compared with the case where the power transmitting coil is lengthened. The power supply efficiency to 22 can be improved. Further, since the power transmission coil 4 is a heating element, the magnetic body itself does not generate heat, so even if a magnetic body is disposed in the vicinity of the puncture needle 5 that punctures the body wall 200, it is not affected by the heat generation. Compared with the case where the power transmission coil 4 is lengthened, the original use of the trocar 1 is hardly hindered.

[Second Embodiment]
The trocar 11 which concerns on 2nd embodiment is demonstrated with reference to FIG.5 and FIG.6. In the embodiment described below, the same components as those in the first embodiment described above are the same as those in the trocar 1 according to the first embodiment described above in terms of function or structure. The description which overlaps with a form is abbreviate | omitted.

FIG. 5 is a cross-sectional view showing a state where the treatment instrument 2 is inserted into the trocar 11. In the trocar 11 according to the present embodiment, in addition to the first embodiment, the second magnetic body 7A is provided adjacent to the proximal end side of the power transmission coil 4. The second magnetic body 7 A is provided on the proximal end side of the main body 81 of the housing 8 so as to protrude from the housing 8, and the inner surface 71 A is disposed at a position that matches the inner diameter of the power transmission coil 4. The shape and size of the second magnetic body 7A may be the same as those of the first magnetic body 7.

As shown in FIG. 6, the trocar 11 according to the present embodiment is provided with the

magnetic bodies

7 and 7 A on the proximal end side and the distal end side of the power transmission coil 4, so that the magnetic flux density generated in the power transmission coil 4 is It can be kept high over a longer range. Therefore, since the magnetic flux generated in the power transmission coil 4 and the power reception coil 22 cross in a longer range in the longitudinal direction, the power feeding efficiency is further improved.

Next, a trocar 12 according to a modification of the present embodiment will be described with reference to FIG. FIG. 7 is a cross-sectional view showing a state where the treatment instrument 2 is inserted into the trocar 12. The trocar 12 is an example in which the third magnetic body 7 B is further provided on the radially outer side of the power transmission coil 4 in the trocar 11 of the second embodiment. By providing the third magnetic body 7B on the outer periphery of the power transmission coil 4, an effect is obtained that a shield layer that does not allow the magnetic flux M to escape from the insertion hole 6 is formed, as schematically shown in FIG. . Therefore, the magnetic connection among the first magnetic body 7, the power transmission coil 4, and the second magnetic body 7A can be more effectively maintained.

[Third embodiment]
A third embodiment of the present invention will be described with reference to FIGS. FIG.9 and FIG.10 is sectional drawing which shows the state by which 2 A of treatment tools were inserted in the trocar 13 which concerns on this embodiment. In the trocar 13 according to the present embodiment, the second magnetic body 7 C is provided on the proximal end side of the power transmission coil 4. The second magnetic body 7C is disposed so as to be able to advance and retract in the direction of the central axis A of the insertion hole 6 with respect to the main body 81a of the housing 8A.

The second magnetic body 7C has a cylindrical shape having a diameter larger than the outer diameter of the power transmission coil 4 and smaller than the outer diameter of the main body 81 of the housing 8A, and is made of the same material as the first magnetic body 7. . As shown in FIGS. 9 and 10, the second magnetic body 7C is provided in the housing 8A so as to be movable from a state protruding from the housing 8A to a state of being inserted into an insertion hole 83 of the housing 8A described later. Yes. The second magnetic body 7 C is arranged so that the central axis of the second magnetic body 7 C is substantially coaxial with the central axis A of the insertion hole 6.

As shown in FIG. 9, an insertion hole 83 is formed in the main body 81 a of the housing 8 A so as to surround the outer peripheral side of the power transmission coil 4. The insertion hole 83 is formed so as to extend substantially parallel to the central axis A of the insertion hole 6. The second magnetic body 7C is inserted into the insertion hole 83 so as to be able to advance and retract in the direction of the central axis A of the insertion hole 6. The power transmission coil 4 is disposed between the insertion hole 6 and the insertion hole 83, but is not exposed to the insertion hole 6 and the insertion hole 83, and is embedded in the main body 81a of the housing 8A.

9 and 10, a compression spring 92 is inserted into the insertion hole 83. The compression spring 92 is disposed between the distal end surface 7C1 of the second magnetic body 7C and the bottom 83a of the insertion hole 83. The distal end 92a of the compression spring 92 abuts on the bottom 83a of the insertion hole 83, and the proximal end 92b of the compression spring 92 is connected to the distal end surface 7C1 of the second magnetic body 7C. In the natural state, the compression spring 92 has an urging force enough to push the second magnetic body 7C toward the proximal end so that the entire second magnetic body 7C protrudes from the insertion hole 83. The second magnetic body 7 C is pushed into the insertion hole 83 when a force that presses the distal end side with a force greater than the urging force of the compression spring 92 is applied.

The insertion part 21 of the treatment instrument 2A is provided with a protrusion (magnetic body moving part) 91. The protrusion 91 protrudes from the outer periphery of the insertion portion 21 toward the radially outer side of the insertion portion 21. The protrusion amount of the protrusion 91 is larger than the inner diameter of the second magnetic body 7C. The protruding portion 91 is provided at a predetermined position in the longitudinal direction of the insertion portion 21, and when the treatment instrument 2A is inserted into the trocar 13 by a predetermined amount, the protruding portion 91 is the base end surface of the second magnetic body 7C. 7C2 is pressed to move the second magnetic body 7C into the insertion hole 83 (inside the housing 8A).

In the medical wireless power feeding system including the trocar 13 and the treatment tool 2A, the second magnetic material provided to protrude to the proximal end side of the trocar 13 in accordance with the step of inserting the treatment tool 2A into the insertion hole 6 of the trocar 13. The body 7C is accommodated in the housing 8A. With this configuration, it is possible to prevent the advance / retreat movement of the treatment instrument 2A relative to the trocar 13 from being hindered by the second magnetic body 7C.

In the present embodiment, the shape of the protrusion 91 is not particularly limited as long as the second magnetic body 7C can be pressed toward the tip side. For example, as the protrusion 91, an annular shape surrounding the outer periphery of the insertion portion 21, or a protrusion provided at one or more places on a part of the outer periphery of the insertion portion 21 can be applied.

Further, the protrusion 91 may be formed of a magnetic material. FIG. 11 is a cross-sectional view showing a first modification of the third embodiment in which the protrusion 91a is made of a magnetic material. When the protrusion is formed of a magnetic material, an effect of further increasing the power supply efficiency of the power transmission coil 4 can be obtained in addition to the function of pressing the second magnetic material 7C. The protrusion 91 a has an annular shape that surrounds the outer periphery of the insertion portion 21. When the protrusion 91a is formed of a magnetic material, the diameter D1 of the protrusion 91a is set to be not less than the inner diameter D2 of the second magnetic body 7C and not more than the outer diameter D3 of the second magnetic body 7C in order to increase power supply efficiency. It is preferable.

FIG. 12 is a cross-sectional view showing a second modification of the third embodiment. When the protrusion 91 of the third embodiment is made of a magnetic material, as shown in FIG. 12, if the outer peripheral edge on the base end side of the protrusion 91b is chamfered, the lines of magnetic force in the power transmission coil 4 are reduced. It becomes difficult to distort and is more preferable.

13 and 14 are cross-sectional views showing a third modification of the third embodiment. In this modification, instead of the protrusion 91a of the first modification of the third embodiment, a permanent magnet 93 (magnetic body moving part) is provided at the base end part 22a of the power receiving coil 22 in the insertion part 21. The permanent magnet 93 moves the second magnetic body 7C in the direction of the insertion hole 83. As shown in FIG. 13, when the insertion portion 21 is pushed toward the distal end side to the vicinity of the proximal end of the power receiving coil 22, the permanent magnet 93 approaches the second magnetic body 7C. When the insertion portion 21 is further pushed into the distal end side in this state, the permanent magnet 93 and the second magnetic body 7C are magnetically coupled by the magnetic force of the permanent magnet 93 as shown in FIG. Therefore, the second magnetic body 7 C moves in the direction of the insertion hole 83 as the permanent magnet 93 moves. In the longitudinal direction of the insertion portion 21, in the portion where the power receiving coil 22 does not exist, the power supply itself is impossible in the first place, so the second magnetic body 7 C is not necessary. In this modification, the second magnet 7C prevents the second magnetic body 7C from moving forward and backward with respect to the trocar 13 by accommodating the unnecessary second magnetic body 7C in the insertion hole 83 by the permanent magnet 93. Can be prevented.

In the third embodiment, the compression spring 92 is used to cause the second magnetic body 7C to protrude from the housing 8 in a natural state, but air is fed into the insertion hole 83 instead of the compression spring 92. Then, the air pressure in the insertion hole 83 may be adjusted. For example, since a trocar is generally used in conjunction with an insufflation apparatus, the air pressure in the insertion hole 83 may be adjusted using this insufflation apparatus.

The embodiments of the present invention have been described above. However, the technical scope of the present invention is not limited to the above embodiments, and combinations of components in the embodiments may be changed without departing from the spirit of the present invention. Various changes can be added to or deleted from each component. The present invention is not limited by the above description, but only by the scope of the appended claims.

According to the present invention, it is possible to obtain a trocar and a medical wireless power feeding system that can improve power feeding efficiency in wireless power feeding to a treatment instrument via a trocar.

1, 11, 12, 13

Trocar

2, 2A Treatment tool 4 Power transmission coil 5 Puncture needle 6

Insertion hole

7, 7A Magnetic body 8 Housing 22 Power reception coil 21 Insertion section 24

Handles

91, 91a, 91b Protrusion section (magnetic body movement section) )
93 Permanent magnet (Magnetic body moving part)
100 Medical wireless power supply system

Claims

A puncture needle for puncturing the surface of a living body,
A housing having an insertion hole communicating with the tip of the puncture needle and into which a treatment instrument having a power receiving coil is inserted;
A power transmission coil that is wound around the insertion hole and is magnetically coupled to the power reception coil;
A magnetic body disposed adjacent to the power transmission coil in the axial direction of the power transmission coil;
Trocar equipped with.
The trocar according to claim 1, wherein the magnetic body is disposed adjacent to the power transmission coil on the puncture needle side.
The trocar according to claim 1 or 2, wherein the magnetic body is disposed adjacent to the power transmission coil on a side where the treatment tool is inserted into the insertion hole.
The trocar according to claim 3, wherein the magnetic body is disposed so as to protrude from the housing.
The trocar according to any one of claims 2 to 4, wherein a surface of the magnetic body facing the insertion hole is disposed at a position that coincides with an inner diameter of the power transmission coil.
The surface facing the insertion hole of the magnetic body is disposed outside the outer diameter of the power transmission coil,
The trocar according to claim 4, wherein the protruding magnetic body is configured to be movable inside the housing.
A treatment instrument having an insertion portion inserted into the insertion hole, and a power receiving coil provided in the insertion portion;
A medical wireless power feeding system comprising the trocar according to any one of claims 1 to 6.
A trocar according to claim 6,
The medical wireless power feeding system according to claim 7, wherein the insertion portion of the treatment instrument has a magnetic body moving portion that moves the magnetic body to the inside of the housing.
The medical wireless power feeding system according to claim 8, wherein the magnetic body moving portion is a protruding portion having a protruding amount larger than an inner diameter of the magnetic body.
10. The medical wireless power feeding system according to claim 9, wherein the protrusion is made of a magnetic material.
The medical wireless power feeding system according to claim 9 or 10, wherein a maximum outer diameter of the protrusion is smaller than an outer diameter of the magnetic body.
The medical wireless power feeding system according to claim 8, wherein the magnetic body moving unit is a permanent magnet disposed between the power receiving coil and a handle.