Electrical appliances

Abstract

Provided is an electricity supplier in which a device shaft provided with an electricity receiver is inserted in a through-hole of a port site. The electricity supplier can realize, at a low cost, the supply of electric power to the electricity receiver, and enables fine operation of the device shaft.　This electricity supplier includes a port site 2; terminals 3A, 3B provided on an inner surface of a through-hole 13 of the port site 2; wires 4A, 4B that connect the terminals 3A, 3B and a power source; a device shaft 5 that is insertable in the through-hole 13 of the port site 2; an electricity receiver 8 provided on the device shaft 5; terminals 6A, 6B provided on an outer surface of the device shaft 5; and wires 7A, 7B that connect the electricity receiver 8 and the terminals 6A, 6B. It is possible to supply electric power from the power source to the electricity receiver 8 by inserting the device shaft 5 in the through-hole 13, thereby causing the terminals 3A, 3B to contact the terminals 6A, 6B.

Description

[Technical field]

[0001] The present invention relates to a power supply device capable of supplying power to a power receiving unit provided on a device shaft when the device shaft, on which a surgical device such as microwave forceps is mounted, is inserted into a through hole at a port site. [Background technology]

[0002] In recent years, most surgeries are shifting to robot-assisted surgery or endoscopic surgery, and these surgeries use surgical instruments equipped with device shafts for performing surgery inside the subject's body. One such surgical instrument has a port site drilled into the subject's body wall and a device shaft inserted into the body through a through-hole in the port site, and emits microwaves from the device shaft to cauterize the bleeding area.

[0003] In the above device, a thick and rigid coaxial cable is connected to the device shaft in order to feed microwaves directly to the device shaft. Therefore, when multiple devices are used in surgery, the multiple coaxial cables tangle the space on the operating table and become extremely inconvenient. In addition, when multiple coaxial cables are connected to avoid this problem, the movement of the device shaft is restricted, making it difficult to delicately operate the device shaft.

[0004] In particular, when using 2.45 GHz microwaves, which are useful for surgery, it is necessary to irradiate the treatment area with microwaves of about 50 W. For this reason, a coaxial cable of 2 m or more is usually laid from an external microwave power source to supply 50 W of power to the tip of the device. In this case, since the transmission loss of microwaves is large, the above wiring is performed using a coaxial cable of about 10 mm in diameter. Although the coaxial cable for microwaves is somewhat flexible, it is quite rigid, so not only is it difficult to operate the device shaft while dragging this coaxial cable, but there are also concerns about the safety of the patient.

[0005] In recent years, high-frequency devices with built-in batteries have been proposed as devices that do not require the above-mentioned coaxial cables, but it has been pointed out that the battery life, weight, and size are not at a level that can withstand the demands.

[0006] In recent years, surgical instruments have also been proposed in which a coaxial cable is connected to a port site, rather than to a device shaft. For example, in the surgical instrument disclosed in Patent Document 1, high-frequency power is supplied from a power supply device to a port site (trocar) via a coaxial cable, and the power supplied to the port site (trocar) is wirelessly fed to the device shaft. However, in the device of Patent Document 1, in order to realize the above-mentioned wireless power feeding, it is necessary to provide a power transmission coil at the port site (trocar) and a power receiving coil at the device shaft, and a complex mechanism for sliding the device shaft is also required to maintain the power transmission coil and the power receiving coil facing each other. For this reason, the manufacturing cost of the surgical instrument of Patent Document 1 is high, and it is considered difficult to make it disposable. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2015-123117 A Summary of the Invention [Problem to be solved by the invention]

[0008] The present invention has been made in consideration of the above-mentioned matters, and an object of the present invention is to provide a power supply device in which a device shaft on which a power receiving unit is provided is inserted into a through hole at a port site, which can supply current to the power receiving unit at low cost and which allows delicate operation of the device shaft. [Means for solving the problem]

[0009] In order to achieve the above object, the present invention includes the subject matter described in the following paragraphs.

[0010] Item 1. A port site formed from an insulating material and having a through hole; a port site side terminal provided on an inner surface of the through hole of the port site; a port site side power supply line connecting the port site side terminal and a power source; A device shaft that can be inserted into the through hole; A power receiving portion provided on the device shaft; a shaft side terminal provided on an outer surface of the device shaft; a shaft-side power supply line provided on the device shaft and connecting the power receiving unit and the shaft-side terminal; The device shaft can be inserted into the through hole of the port site to bring the port site side terminal into contact with the shaft side terminal, a power supply unit that, when the port site side terminal and the shaft side terminal are in contact with each other, can supply power from the power source to the power receiving unit via the port site side power supply line, the port site side terminal, the shaft side terminal, and the shaft side power supply line.

[0011] Item 2. Further comprising an air supply tube connected to the port site; Item 2. The power supply device according to item 1, wherein the gas flowing in the gas supply tube is introduced into the through hole and discharged from an opening of the through hole at the other end of the port site.

[0012] Item 3. A cylindrical cover formed from a stretchable insulating material, The cylindrical cover is provided so that the device shaft passes through the inside thereof, and one end of the cylindrical cover is fixed to an outer surface of the device shaft at a midpoint thereof, the shaft side terminal is provided on the tip side of the device shaft relative to the intermediate position, 3. The power supply device according to item 1 or 2, wherein, in a state in which the port site side terminal and the shaft side terminal are in contact with each other, one end of the cylindrical cover is in contact with one end of the port site, and the entire shaft side terminal in contact with the port site side terminal is accommodated in a space formed by the inside of the cylindrical cover and the through hole of the port site.

[0013] Item 4. The power supply device according to any one of Items 1 to 3, wherein, in a state in which the port site side terminal and the shaft side terminal are in contact with each other, the entire shaft side terminal in contact with the port site side terminal is located inside the through hole.

[0014] Item 5. As the port site side terminal, a pair of the port site side terminals arranged to face each other in the radial direction of the port site are provided, As the port site side power feed line, a first port site side power feed line for connecting one of the port site side terminals and a power source, and a second port site side power feed line for connecting the other port site side terminal and a power source are provided, As the shaft side terminal, a pair of shaft side terminals is provided that is arranged to face each other in a radial direction of the device shaft, As the shaft-side power supply line, a first shaft-side power supply line for connecting one of the shaft-side terminals and a power receiving unit, and a second shaft-side power supply line for connecting the other shaft-side terminal and a power receiving unit are provided, 5. The power supply device according to any one of items 1 to 4, wherein the pair of shaft side terminals are inserted into the through holes of the port site, one of the pair of shaft side terminals is brought into contact with one of the pair of port site side terminals, and the other of the pair of shaft side terminals is brought into contact with the other of the pair of shaft side terminals, thereby enabling power from the power source to be supplied to the power receiving unit by the first and second port site side power supply lines, the pair of port site side terminals, the pair of shaft side terminals, and the first and second shaft side power supply lines.

[0015] Item 6. In the circumferential direction of the port site, a gap is provided between one ends of the pair of port site side terminals and between the other ends of the pair of port site side terminals, Item 6. The power supply unit according to item 5, wherein a width of each of the pair of shaft side terminals is shorter than a width of the gap.

[0016] Item 7. A plurality of pairs of the shaft side terminals are provided at intervals in the axial direction of the device shaft, As the shaft-side power supply line, a first shaft-side power supply line for connecting one of the pair of shaft-side terminals of each set to a power source and a second shaft-side power supply line for connecting the other of the pair of shaft-side terminals of each set to a power source are provided, 7. The power supply device according to item 5 or 6, wherein one of the pair of shaft side terminals is inserted into a through hole at the port site, one of the pair of shaft side terminals is brought into contact with one of the pair of port site side terminals, and the other of the pair of shaft side terminals is brought into contact with the other of the pair of shaft side terminals, thereby enabling power from the power source to be supplied to the power receiving unit by the first and second port site side power supply lines, the pair of port site side terminals, the pair of shaft side terminals, and the first and second shaft side power supply lines.

[0017] Item 8. The power supply device according to item 7, wherein when one of the set of shaft side terminals is brought into contact with one of the pair of port site side terminals and the other of the set of shaft side terminals is brought into contact with the other of the pair of shaft side terminals, the entire set of shaft side terminals is housed inside the through hole of the port site.

[0018] Item 9. The power supply unit according to item 7 or 8, wherein the interval between the two pairs of shaft side terminals adjacent to each other in the axial direction of the device shaft is equal to the length of the pair of port site side terminals.

[0019] Item 10. The pair of shaft side terminals of each set are supported by a spring and disposed in a recess formed on the outer surface of the device shaft; the first shaft-side power supply wire passes through the recess in which one of the pair of shaft-side terminals of each set is disposed, and the second shaft-side power supply wire passes through the recess in which the other of the pair of shaft-side terminals of each set is disposed, 10. The power supply device according to any one of items 7 to 9, wherein one of the pair of shaft side terminals is pressed down to contact the first shaft side power supply line passing through the recess and the other shaft side terminal is pressed down to contact the second shaft side power supply line passing through the recess, and the set of shaft side terminals is inserted into a through hole at the port site to bring one of the set of shaft side terminals into contact with one of the pair of port site side terminals and the other of the set of shaft side terminals into contact with the other of the pair of shaft side terminals, thereby enabling power from the power source to be supplied to the power receiving unit by the first and second port site side power supply lines, the pair of port site side terminals, the set of the pair of shaft side terminals, and the first and second shaft side power supply lines.

[0020] Item 11. The first shaft side power supply line is composed of a plurality of first wires connected in the axial direction of the device shaft, and the second shaft side power supply line is composed of a plurality of second wires connected in the axial direction of the device shaft, Among the plurality of first wires, the first wire closest to the power receiving unit has one end proximal to the power receiving unit connected to the power receiving unit and the other end distal to the power receiving unit extending into the recess closest to the power receiving unit among the recesses in which one of the pair of shaft side terminals of each set is arranged, and the remaining first wires have one end proximal to the power receiving unit and the other end distal to the power receiving unit extending into the recess in which one of the pair of shaft side terminals of each set is arranged, the recess being adjacent in the axial direction of the device shaft, the first wires are each disposed in the recess with the other end supported by a spring, and the shaft side terminal can be brought into contact with the other end of the first wire disposed in the recess by pushing the shaft side terminal into the recess, In the recess from which one end of the first wire on the distal side of the power receiving unit and the other end of the first wire on the proximal side of the power receiving unit extend, when the shaft side terminal is not pressed into the recess, the other end of the first wire on the proximal side of the power receiving unit is lifted by the elastic force of a spring, thereby coming into contact with the one end of the first wire on the distal side of the power receiving unit; and when the shaft side terminal is pressed into the recess, the shaft side terminal pushes and moves the other end of the first wire on the proximal side of the power receiving unit, thereby separating the other end of the first wire on the proximal side of the power receiving unit from the one end of the first wire on the distal side of the power receiving unit. Among the plurality of second wires, the second wire closest to the power receiving unit has one end on the proximal side of the power receiving unit connected to the power receiving unit and the other end on the distal side of the power receiving unit extending into the recess closest to the power receiving unit among the recesses in which the other of the pair of shaft side terminals of each set is arranged, and the remaining second wires have one end on the proximal side of the power receiving unit and the other end on the distal side of the power receiving unit extending into the recess in which the other of the pair of shaft side terminals of each set is arranged, the recess being adjacent in the axial direction of the device shaft, the second wires are each disposed in the recess with the other end supported by a spring, and the shaft side terminal can be brought into contact with the other end of the second wire disposed in the recess by pressing the shaft side terminal into the recess, Item 11. The power supply device according to item 10, wherein in the recess from which one end of the second wire on the distal side of the power receiving unit and the other end of the first wire on the proximal side of the power receiving unit extend, when the shaft side terminal is not pressed into the recess, the other end of the second wire on the proximal side of the power receiving unit is lifted by the elastic force of a spring and comes into contact with the one end of the second wire on the distal side of the power receiving unit, and when the shaft side terminal is pressed into the recess, the shaft side terminal pushes and moves the other end of the second wire on the proximal side of the power receiving unit, so that the other end of the second wire on the proximal side of the power receiving unit is separated from the one end of the second wire on the distal side of the power receiving unit.

[0021] Item 12. The power source is a DC power source or an AC power source, Item 12. The power supply device according to any one of items 1 to 11, wherein the power receiving unit outputs microwaves when DC power or AC power is supplied from the power source.

[0022] Item 13. The power source is a DC power source or an AC power source, Item 12. The power feeder according to any one of items 1 to 11, wherein the power receiving unit outputs a high frequency wave when DC power or AC power is supplied from the power source.

[0023] Item 14. A port site formed from an insulating material and having a through hole; a port site side terminal provided on an inner surface of the through hole of the port site; a port site side power supply line connecting the port site side terminal and a power source; A device shaft that can be inserted into the through hole; A power receiving portion provided on the device shaft; a shaft side terminal provided on an outer surface of the device shaft; a shaft-side power supply line provided on the device shaft and connecting the power receiving unit and the shaft-side terminal; The power receiving unit includes at least a microwave transmitter and a microwave amplifier, The device shaft can be inserted into the through hole of the port site to bring the port site side terminal into contact with the shaft side terminal, When the port site side terminal and the shaft side terminal are in contact with each other, power from the power source is supplied to the power receiving unit via the port site side power feed line, the port site side terminal, the shaft side terminal, and the shaft side power feed line, the power source is a DC power source, The microwave oscillator oscillates microwaves using DC power supplied from the power source to the power receiving unit as a DC power source, and the microwave amplifier amplifies the microwaves using the DC power supplied from the power source to the power receiving unit as a DC power source.

[0024] Item 15. A port site formed from an insulating material and having a through hole; a port site side terminal provided on an inner surface of the through hole of the port site; a port site side power supply line connecting the port site side terminal and a power source; A device shaft that can be inserted into the through hole; A power receiving portion provided on the device shaft; a shaft side terminal provided on an outer surface of the device shaft; a shaft-side power supply line provided on the device shaft and connecting the power receiving unit and the shaft-side terminal; The power receiving unit includes at least a converter, a microwave transmitter, and a microwave amplifier, The device shaft can be inserted into the through hole of the port site to bring the port site side terminal into contact with the shaft side terminal, When the port site side terminal and the shaft side terminal are in contact with each other, power from the power source is supplied to the power receiving unit via the port site side power feed line, the port site side terminal, the shaft side terminal, and the shaft side power feed line, the power source is an AC power source, The converter converts AC power supplied from the power source to the power receiving unit into DC power, the microwave oscillator uses the DC power converted by the converter as a DC power source to oscillate microwaves, and the microwave oscillator uses the DC power converted by the converter as a DC power source to amplify the microwaves.

[0025] Item 16. The power supply unit according to item 14 or 15, wherein the microwave frequency is 2.45 GHz ± 50 MHz, the power conversion efficiency of the microwave amplifier is 50% or more, and the power supplied from the power source to the power receiving unit is 10 W or more and 150 W or less. Effect of the Invention

[0026] According to the power supply device of the present invention, the port site side power supply line is connected to the port site side terminal provided at the port site, so the movement of the device shaft is not restricted. Therefore, delicate operation of the device shaft is possible, and when the power supply device is used in surgery, the safety of the subject can be improved.

[0027] Furthermore, with the power supply device according to the present invention, power is supplied to the power receiving unit by a simple mechanism in which the power supply path on the power source side (the port site side power supply line and the port site side terminal) is connected to the power receiving unit side power supply path (the shaft side terminal and the shaft side power supply line) by contact between the port site side terminal and the shaft side terminal. Therefore, with the power supply device of the present invention, it is possible to supply power to the power receiving unit at low cost.

[0028] Furthermore, according to the power feeder of the present invention, since the port site side terminal and the power source are connected using a power feed line instead of a rigid coaxial cable, the load applied to the device shaft from the port site can be kept small when the device shaft is operated with the device shaft inserted into the port site. Therefore, the device shaft can be easily operated with the device shaft inserted into the port site (for example, the device shaft can be easily tilted to change the angle of the device shaft and the port site with the device shaft inserted into the port site). [Brief description of the drawings]

[0029] [Figure 1] 1A and 1B are diagrams showing a power supply unit according to an embodiment of the present invention, in which (a) is a schematic side view of the power supply unit, and (b) is a schematic vertical sectional view of the power supply unit. [Diagram 2] 2 is a schematic cross-sectional view showing a state in which the power feeder is cut along the line AA in FIG. [Diagram 3] FIG. 2 is a schematic diagram showing a state in which a power supply unit is used. [Figure 4]2(a) is a schematic cross-sectional view of a port site 2 included in the power supply unit shown in FIG. 1, and (b) is a schematic cross-sectional view of a device shaft 5 included in the power supply unit shown in FIG. [Diagram 5] 1A is a schematic longitudinal cross-sectional view showing the process of inserting the device shaft into the through hole, where (a) shows the state when the tip side of the device shaft is positioned within the through hole, (b) shows the state when the length of the tip side of the device shaft extending from one end of the port site is at its shortest when the port site side terminal and the shaft side terminal are in contact, and (c) shows the state when the length of the tip side of the device shaft extending from one end of the port site is at its longest when the port site side terminal and the shaft side terminal are in contact. [Figure 6] FIG. 11 is a schematic vertical cross-sectional view showing a power feeder according to a modified example of the present invention. [Figure 7] 1A and 1B are schematic longitudinal cross-sectional views showing a power supply device according to a modified example of the present invention, in which (a) shows a state in which shaft side terminals 6Aa, 6Ba are in contact with port site side terminals 3A, 3B, and (b) shows a state in which shaft side terminals 6Ab, 6Bb are in contact with port site side terminals 3A, 3B. [Figure 8] 8 is a schematic enlarged longitudinal sectional view showing a part of the power feeder shown in FIG. 7. [Figure 9] 1A and 1B are schematic longitudinal cross-sectional views showing a power supply device according to a modified example of the present invention, in which (a) shows a state in which shaft side terminals 6Ca, 6Da are in contact with port site side terminals 3A, 3B, and (b) shows a state in which shaft side terminals 6Cb, 6Db are in contact with port site side terminals 3A, 3B. [Figure 10] 9(a) is a schematic cross-sectional view showing a state in which the power feeder is disconnected at the position of line AA shown in FIG. [Figure 11] 10 is a schematic enlarged vertical cross-sectional view showing a part of the power feeder shown in FIG. 9. [Figure 12] 10(a) is a schematic cross-sectional view of a port site included in the power supply unit shown in FIG. 9, and (b) is a schematic cross-sectional view of a device shaft included in the power supply unit shown in FIG. [Figure 13]FIG. 11 is a schematic vertical cross-sectional view showing a power supply device according to a modified example of the present invention, illustrating a state in which shaft side terminals 6Ca, 6Da and port site side terminals 3A, 3B are in contact with each other. [Figure 14] FIG. 13 is a schematic vertical cross-sectional view showing a power feeder according to a modified example of the present invention, illustrating a state in which shaft side terminals 6Cb, 6Db are in contact with port site side terminals 3A, 3B. [Figure 15] FIG. 14 is an enlarged cross-sectional view of a part of FIG. [Figure 16] FIG. 15 is an enlarged cross-sectional view of a part of FIG. [Figure 17] 1(a) is a schematic cross-sectional view showing a modified example in which an insulator is provided in the power supply device shown in FIGS. 1 to 8, and (b) is a schematic cross-sectional view showing a modified example in which an insulator is provided in the power supply device shown in FIGS. 9 to 12. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0030] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. Fig. 1(a) is a schematic side view of a power supply unit according to an embodiment of the present invention, and Fig. 1(b) is a schematic longitudinal sectional view of the power supply unit according to an embodiment of the present invention. Fig. 2 is a schematic transverse sectional view showing a state in which the power supply unit is cut along line AA in Fig. 1(a). Fig. 3 is a schematic view showing a state in which the power supply unit is in use. Fig. 4(a) is a schematic transverse sectional view of a port site 2 included in the power supply unit shown in Fig. 1. Fig. 4(b) is a schematic transverse sectional view of a device shaft 5 included in the power supply unit shown in Fig. 1.

[0031] The power supply device of this embodiment is used for surgery inside the body of a subject H (FIG. 3). As shown in FIGS. 1 to 3, the power supply device of this embodiment includes a port site 2, a pair of port site side terminals 3A and 3B, port site side power supply lines 4A and 4B, a device shaft 5, a pair of shaft side terminals 6A and 6B, shaft side power supply lines 7A and 7B, a power receiving unit J, a first coaxial cable 10, a second coaxial cable 11, and a cylindrical cover 12.

[0032] The port site 2 is a cylinder having a circular cross-sectional through hole 13, and is made of an insulating material such as resin. In the illustrated example, the port site 2 has a large diameter section 2a from which an elongated small diameter section 2b extends, and the through hole 13 passes through the large diameter section 2a and the small diameter section 2b.

[0033] The pair of port site side terminals 3A, 3B are made of metal foil and are provided on the inner surface of the through hole 13 of the port site 2. The pair of port site side terminals 3A, 3B are arranged to face each other in the radial direction E (FIG. 4(a)) of the port site 2, and are fixed to the port site 2 using screws or adhesive. The port site side terminals 3A, 3B face each other in the radial direction E means that the width center of the terminal 3A and the width center of the terminal 3B are located on the same straight line extending in the radial direction E. Each of the port site side terminals 3A, 3B has a length less than half the circumference of the port site 2. In the circumferential direction of the port site 2, a gap S (FIG. 2) is provided between one ends of the port site side terminals 3A, 3B and between the other ends of the port site side terminals 3A, 3B. The port site side terminals 3A, 3B may be formed by applying metal powder to the inner surface of the through hole 13.

[0034] The port site side power feeders 4A and 4B are DC power feeders, and the port site side power feeder 4A connects the port site side terminal 3A to one pole of a DC power supply, and the port site side power feeder 4B connects the port site side terminal 3B to the other pole of the DC power supply. A user can apply a voltage to the port site side terminals 3A and 3B via the port site side power feeders 4A and 4B by turning on a switch (foot switch, etc.) connected to the DC power supply, and can stop the application of the voltage to the terminals 3A and 3B by turning off the switch. In the illustrated example, the port site side power feeders 4A and 4B are inserted into the through hole 13 from the opening 13a at one end of the port site 2 in order to connect the port site side power feeders 4A and 4B to the port site side terminals 3A and 3B.

[0035] The device shaft 5 is a cylinder formed from an insulating material such as resin, and can be inserted into the through hole 13 of the port site 2 (Figure 5 is a schematic longitudinal cross-sectional view showing the process of inserting the device shaft 5 into the through hole 13 of the port site 2. Figure 5(a) shows the state when the tip side of the device shaft 5 is positioned within the through hole 13, and Figures 5(b) and 5(c) show the state when the tip side of the device shaft 5 extends from the opening 13b of the through hole 13 at the other end of the port site 2).

[0036] The device shaft 5 has a cavity 14 (FIG. 2) extending in the longitudinal direction. A gripping portion 5a (FIG. 1) for a practitioner to grip is provided on the base end side of the device shaft 5 so as to protrude radially outward. The gripping portion 5a has a hollow structure, and the cavity 14 (FIG. 2) of the device shaft 5 extends from the internal space of the gripping portion 5a (FIG. 1) to the tip end of the device shaft 5. A power receiving portion J that outputs microwaves when DC power is supplied from a power source is provided in the internal space of the gripping portion 5a. The power receiving portion J includes a microwave oscillator 8 and a microwave amplifier 9. The microwave oscillator 8 oscillates microwaves using the DC power supplied from the power source to the power receiving portion J as a DC power source. The microwave amplifier 9 amplifies the microwaves oscillated by the microwave oscillator 8 using the DC power supplied from the power source to the power receiving portion J as a DC power source.

[0037] The pair of shaft side terminals 6A, 6B are made of metal foil and provided on the outer surface of the device shaft 5. The shaft side terminals 6A, 6B are arranged to face each other in the radial direction F (FIG. 4(b)) of the device shaft 5, and are fixed to the device shaft 5 using screws or adhesive. The shaft side terminals 6A, 6B face each other in the radial direction F means that the width center of the terminal 6A and the width center of the terminal 6B are located on the same straight line extending in the radial direction F. The width Ha of the shaft side terminals 6A, 6B (FIG. 4(b)) is shorter than the width Hb of the gap S (FIG. 4(a)). The shaft side terminals 6A, 6B may be formed by applying metal powder to the outer surface of the device shaft 5.

[0038] As shown in FIG. 1( b ), shaft-side power supply lines 7A and 7B, a first coaxial cable 10, and a second coaxial cable 11 are provided on the device shaft 5.

[0039] The shaft-side power feed lines 7A and 7B are DC power feed lines, and the shaft-side power feed line 7A connects the shaft-side terminal 6A and the power receiving unit J, and the shaft-side power feed line 7B connects the shaft-side terminal 6B and the power receiving unit J. The shaft-side power feed lines 7A and 7B are assumed to pass through, for example, the cavity 14 of the device shaft 5. In this case, one end of the shaft-side power feed lines 7A and 7B enters the internal space of the gripping unit 5a and is connected to the power receiving unit J (FIG. 1(b)). The other end of the shaft-side power feed lines 7A and 7B is assumed to penetrate the wall of the device shaft 5 in the radial direction F (FIG. 4(b)), and the other end of the shaft-side power feed lines 7A and 7B extending radially outward from the device shaft 5 is connected to the shaft-side terminals 6A and 6B, respectively.

[0040] The first coaxial cable 10 is disposed in the internal space of the gripping portion 5a, and connects the microwave oscillator 8 and the microwave amplifier 9 together.

[0041] A second coaxial cable 11 passes through a cavity 14 (FIG. 2) in the device shaft 5 and extends from the microwave amplifier 9 to the tip of the device shaft 5 .

[0042] In the illustrated example, a pair of blades 20, 20 is provided at the tip (working part) of the device shaft 5, and the microwave amplifier 9 and the blades 20, 20 are connected by a second coaxial cable 11. The blades 20, 20 have exposed central conductor and outer conductor ends, and an insulator is positioned between the central conductor and the outer conductor ends, like the tapered coaxial body disclosed in JP 2018-11994 A, for example, and are capable of supplying microwaves to the central conductor via the second coaxial cable 11.

[0043] In this embodiment, a wire or shaft (not shown) is connected to the blades 20, 20, and the blades 20, 20 can be opened and closed by pushing and pulling the wire or shaft. For example, the wire or shaft (not shown) is assumed to pass through the cavity 14 of the device shaft 5, and the wire or shaft can be pushed and pulled by operating the trigger 5b connected to the base end side of the device shaft 5, thereby opening and closing the blades 20, 20. In addition, a drive mechanism for rotating the wire or shaft around the axis may be provided on the device shaft 5, so that the blades 20, 20 can be rotated with the rotation of the wire or shaft. The drive mechanism is provided, for example, on the gripping portion 5a.

[0044] The cylindrical cover 12 is provided so that the device shaft 5 passes through its inside, and is formed of a stretchable insulating material (e.g., resin). One end of the cylindrical cover 12 is fixed to the outer surface of the device shaft 5 at the midway position 5c, and the shaft side terminals 6A, 6B are provided on the tip side of the device shaft 5 (left side in FIG. 1) from the midway position 5c of the device shaft 5. The above-mentioned "fixing one end of the cylindrical cover 12 to the midway position 5c of the device shaft 5" can be realized, for example, by making the inner diameter of the opening of one end of the cylindrical cover 12 coincide with the outer diameter of the position 5c of the device shaft 5 (in this case, the one end of the cylindrical cover 12 is fixed to the position 5c of the device shaft 5 by the frictional force generated between the opening edge of one end of the cylindrical cover 12 and the outer surface of the position 5c of the device shaft 5). Note that one end of the cylindrical cover 12 may be fixed to the midway position 5c of the device shaft 5 using an adhesive.

[0045] In the power supply device of this embodiment, as shown in FIG. 5(a), the device shaft 5 is inserted into the through hole 13 from one end side of the port site 2, and the tip side of the device shaft 5 extends from the other end of the port site 2 as shown in FIG. 5(b) and FIG. 5(c). This makes it possible to bring one of the shaft side terminals 6A, 6B into contact with the port site side terminal 3A and the other terminal 6 into contact with the port site side terminal 3B (FIG. 5(b) shows the state when the length D of the device shaft 5 extending from the other end of the port site 2 is the shortest under the condition that the terminals 3, 6 are in contact, and FIG. 5(c) shows the state when the length D of the device shaft 5 extending from the other end of the port site 2 is the longest under the condition that the terminals 3, 6 are in contact). 5(b) and 5(c) show a state in which terminal 6A is in contact with terminal 3A and terminal 6B is in contact with terminal 3B, but by rotating the device shaft 5 relatively to the port site 2 from this state, it is possible to bring terminal 6B into contact with terminal 3A and terminal 6A into contact with terminal 3B, in the opposite manner to the above. Hereinafter, the above-mentioned "one terminal 6 of the shaft side terminals 6A, 6B is in contact with the port site side terminal 3A and the other terminal 6 is in contact with the port site side terminal 3B" will be appropriately abbreviated as "the port site side terminal 3 and the shaft side terminal 6 are in contact."

[0046] By contacting the port site side terminal 3 and the shaft side terminal 6 as described above, the power supply path on the power source side (the power supply path formed by the power feeders 4A, 4B and terminals 3A, 3B) and the power supply path on the power receiving unit J side (the power supply path formed by the terminals 6A, 6B and power feeders 7A, 7B) are connected, and DC power from the DC power source can be supplied to the power receiving unit J via the port site side power feeders 4A, 4B, the port site side terminals 3A, 3B, the shaft side terminals 6A, 6B, and the shaft side power feeders 7A, 7B. 5(b) and 5(c), when terminal 3A and terminal 6A are in contact and terminal 3B and terminal 6B are in contact, the DC power flows in the following order: positive pole of DC power supply → power feeder 4A → terminal 3A → terminal 6A → power feeder 7A → power receiving unit J → power feeder 7B → terminal 6B → terminal 3B → power feeder 4B → negative pole of DC power supply. Also, unlike the illustrated example, when terminal 3A and terminal 6B are in contact and terminal 3B and terminal 6A are in contact, the DC power flows in the following order: positive pole of DC power supply → power feeder 4A → terminal 3A → terminal 6B → power feeder 7B → power receiving unit J → power feeder 7A → terminal 6A → terminal 3B → power feeder 4B → negative pole of DC power supply.

[0047] In the state where the port site side terminal 3 and the shaft side terminal 6 are in contact with each other as described above (the power supply path on the power source side and the power supply path on the power receiving unit J side are connected), DC power is supplied to the microwave oscillator 8 and the microwave amplifier 9 of the power receiving unit J, causing the microwave oscillator 8 to oscillate microwaves, and the microwaves are supplied to the microwave amplifier 9 via the first coaxial cable 10 for amplification, and the amplified microwaves are supplied to the central conductor of the tip end (blades 20, 20) of the device shaft 5 via the second coaxial cable 11, and can be emitted from the central conductor. The frequency of the microwaves emitted from the central conductor is not particularly limited, but is preferably 300 MHz to 6 GHz, and more preferably 2.45 GHz ± 50 MHz.

[0048] As described above, contact between the port site side terminal 3 and the shaft side terminal 6 when the device shaft 5 is inserted into the through hole 13 can be achieved by adjusting the installation position, length, and thickness of the port site side terminal 3 and the shaft side terminal 6, the inner diameter of the port site 2, the outer diameter of the device shaft 5, etc.

[0049] 5(b) and 5(c), in the power supply device of this embodiment, with the port site terminal 3 and the shaft side terminal 6 in contact with each other, the other end of the tubular cover 12 is in contact with one end of the port site 2, and the entire shaft side terminal 6 is accommodated in the space formed by the inside of the tubular cover 12 and the through hole 13 of the port site 2. This is intended to prevent the practitioner from receiving an electric shock due to contact with the terminal 6, and is achieved by adjusting the lengths of the port site 2, tubular cover 12, port site terminal 3, and shaft side terminal 6, the fixing position 5c of one end of the tubular cover 12, the positions of the port site terminal 3 and shaft side terminal 6, etc. As described above, since the tubular cover 12 is formed from an elastic insulating material, as the device shaft 5 is inserted into the through hole 13, the fixed position 5c of one end of the tubular cover 12 approaches the port site 2, and the tubular cover 12 is gradually compressed (Figures 5(a) and 5(b) show the state when the tubular cover 12 is not compressed, and Figure 5(c) shows the state when the tubular cover 12 is compressed).

[0050] When the power supply device of this embodiment is used in surgery, first, the port site 2 is drilled in the body wall of the subject H (FIG. 3). At this time, the orientation of the port site 2 is adjusted so that one end side of the port site 2 is located outside the body and the other end side of the port site 2 is inside the body. As in the illustrated example, when the port site 2 has a large diameter portion 2a on one end side and a small diameter portion 2b on the other end side, for example, the small diameter portion 2b is inserted into the body until the large diameter portion 2a comes into contact with the surface of the body wall.

[0051] Next, the port site side power supply lines 4A and 4B are fixed to the surface of the body wall of the subject H.

[0052] Next, the device shaft 5 is inserted into the through hole 13 from one end side of the port site 2, and the tip side of the device shaft 5 is extended into the body from the other end of the port site 2, and the blades 20, 20 (the tips of the device shaft 5) are positioned at the surgical site inside the body. At this time, the blades 20, 20 are opened and closed by operating the trigger 5b, and the part to be coagulated and cut is clamped between the blades 20, 20, and the coagulation (hemostasis) and cutting operations are performed.

[0053] Then, as described above, when the blades 20, 20 are positioned at the surgical site in the body, if the port site side terminal 3 and the shaft side terminal 6 are in contact with each other, the switch connected to the power source can be turned on to operate the device at the surgical site. That is, by turning on the switch, DC power is supplied to the power receiving unit J, microwaves are generated from the microwave oscillator 8, and the microwaves are supplied to the microwave amplifier 9 and amplified, and the amplified microwaves are supplied to the central conductor of the blades 20, 20 and emitted to the coagulation cutting site. This causes the surgical site to be cauterized and hemostasis is performed. The microwaves emitted from the central conductor to the surgical site flow to the external conductor of the blades 20, 20 in the vicinity. Also, with the switch turned on, if the device shaft 5 is inserted through the through hole 13 of the port site 2 and the port site side terminal 3 and the shaft side terminal 6 are brought into contact with each other, DC power is supplied to the power receiving unit J from the moment the terminals 3, 6 come into contact with each other, and microwaves are emitted from the blades 20, 20 (the tip of the device shaft 5).

[0054] According to the power feeder of the present embodiment described above, it is possible to supply power to the power receiving unit J by a simple mechanism in which the power supply path (power feeders 4A, 4B and terminals 3A, 3B) on the power source side and the power feed path (terminals 6A, 6B and power feeders 7A, 7B) on the power receiving unit J side are connected by contact between the port site side terminal 3 and the shaft side terminal 6. Therefore, according to the power feeder of the present embodiment, it is possible to supply power to the power receiving unit J at low cost.

[0055] Furthermore, according to the power feeder of this embodiment, the power supply lines 4A and 4B on the power source side are connected to the terminals 3A and 3B of the port site 2, so that the movement of the device shaft 5 is not restricted as in the case where the power supply line on the power source side is connected to the device shaft 5. Therefore, delicate operation of the device shaft 5 is possible. This can improve the safety of the subject H.

[0056] Furthermore, according to the power feeder of this embodiment, since the port site side power feeders 4A, 4B are connected to the port site 2 drilled in the body wall of the subject H, the power feeders 4A, 4B can be fixed along the surface of the body wall of the subject H, as shown in Fig. 3. In this way, the power feeders 4A, 4B do not clutter the space above the operating table, and the surgical support operation can be smoothly performed.

[0057] According to the power feeder of this embodiment, the port site side terminal 3 and the power source are connected using the power feed line 4 without using a rigid coaxial cable, so that when the device shaft 5 is inserted into the port site 2 and the device shaft 5 is operated to change the state of the device shaft 5 and the port site 2, the load applied from the port site 2 to the device shaft 5 can be kept small. Therefore, the device shaft 5 can be easily operated (i.e., the state of the device shaft 5 and the port site 2 can be easily changed). For example, when tilting the device shaft 5 to change the angle of the device shaft 5 and the port site 2, the load applied from the port site 2 to the device shaft 5 is small, so that the device shaft 5 can be easily tilted (i.e., the angle of the device shaft 5 and the port site 2 can be easily changed).

[0058] Furthermore, according to the power supply device of this embodiment, the port site side terminals 3A, 3B face the radial direction E (FIG. 4(a)) of the port site 2, the shaft side terminals 6A, 6B face the radial direction F (FIG. 4(b)) of the device shaft 5, and the width Ha (FIG. 4(b)) of the shaft side terminals 6A, 6B is smaller than the width Hb (FIG. 4(a)) of the gap S. For this reason, even if the device shaft 5 rotates during surgery, a situation does not occur in which one terminal 6 (terminal 6A or terminal 6B) comes into contact with both the port site side terminals 3A, 3B, and therefore no short circuit between the terminals occurs.

[0059] Furthermore, according to the power supply device of this embodiment, while the port site terminal 3 and the shaft side terminal 6 are in contact with each other to supply power to the power receiving unit J, the shaft side terminals 6A and 6B are entirely housed within the space formed by the inside of the cylindrical cover 12 and the through hole 13 of the port site 2 (FIGS. 1(b), 5(b), and 5(c)). This makes it possible to prevent the practitioner, etc. from receiving an electric shock due to contact with the shaft side terminals 6A and 6B.

[0060] Furthermore, according to the power feeder of this embodiment, microwaves are emitted from the tip (blades 20, 20) of the device shaft 5, so that water molecules in the biological tissue of the subject H can be excited and the biological tissue itself can be heated. Therefore, the extent of damage to the surrounding area can be minimized without burning the biological tissue.

[0061] The present invention is not limited to the above embodiment, and can be modified in various ways. Modifications of the present invention will be described below. In the following description, differences from the above embodiment will be mainly described, and the same reference numerals will be used to describe configurations common to the above embodiment, and description thereof will be omitted.

[0062] In the above embodiment, the port site side power feeders 4A, 4B are inserted into the through hole 13 from the opening 13a (FIG. 1(b)) at one end of the port site 2. However, as shown in FIG. 6, the port site side power feeders 4A, 4B may pass through the cylindrical wall of the port site 2. In this case, the ends of the power feeders 4A, 4B extending into the through hole 13 are connected to the port site side terminals 3A, 3B, respectively. Note that in the illustrated example, the port site side power feeders 4A, 4B pass through the cylindrical wall of the large diameter portion 2a, but they may pass through the cylindrical wall of the small diameter portion 2b.

[0063] As shown in FIG. 6, the gas supply tube 40 may be connected to the port site 2, and the power supply device may be configured to introduce the gas G flowing in the gas supply tube 40 into the through hole 13 and discharge the gas G from the opening 13b of the through hole 13 at the other end of the port site 2. In this way, it is possible to prevent the body fluid of the subject H (FIG. 3) from flowing into the through hole 13 from the opening 13b. In the example of FIG. 6, the gas supply tube 40 is connected to a hole 41 penetrating the cylindrical wall of the port site 2, so that the gas G flowing in the gas supply tube 40 is introduced into the through hole 13. The diameter of the opening 13a of the through hole 13 at one end of the port site 2 is approximately equal to the outer diameter of the device shaft 5, so that most of the gas G introduced into the through hole 13 is discharged from the opening 13b at the other end of the port site 2.

[0064] In the above embodiment, an example was shown in which one pair of shaft side terminals 6A, 6B was provided on the device shaft 5, but as shown in Fig. 7 and Fig. 8, multiple pairs of shaft side terminals 6A, 6B may be provided at intervals in the axial direction of the device shaft 5. In this case, shaft side power feeders 7A, 7B for connecting each pair of shaft side terminals 6A, 6B to the power receiving unit J are provided on the device shaft 5. Then, by inserting the pair of shaft side terminals 6A, 6B into the through hole 13 and bringing them into contact with the port site side terminals 3A, 3B, it is possible to supply DC power to the power receiving unit J and emit microwaves from the blades 20, 20 (the tips of the device shaft 5).

[0065] In the illustrated example, a pair of terminals 6Aa, 6Ba and a pair of terminals 6Ab, 6Bb are spaced apart in the axial direction of the device shaft 5, and the terminal 6Aa is connected to the power receiving unit J by a power feed line 7Aa, the terminal 6Ab is connected to the power receiving unit J by a power feed line 7Ab, the terminal 6Ba is connected to the power receiving unit J by a power feed line 7Ba, and the terminal 6Bb is connected to the power receiving unit J by a power feed line 7Bb.

[0066] As shown in Figures 7(a) and 8, when terminals 6Aa, 6Ba are in contact with terminals 3A, 3B, DC power from a DC power source can be supplied to power receiving unit J via power feeders 4A, 4B, terminals 3A, 3B, terminals 6Aa, 6Ba, and power feeders 7Aa, 7Ba, so that microwaves can be emitted from blades 20, 20.

[0067] Furthermore, as shown in FIG. 7(b), when terminals 6Ab, 6Bb are in contact with terminals 3A, 3B, DC power from a DC power source can be supplied to power receiving unit J via power feeders 4A, 4B, terminals 3A, 3B, terminals 6Ab, 6Bb, and power feeders 7Ab, 7Bb, so that microwaves can be emitted from blades 20, 20.

[0068] 7 and 8, when multiple pairs of shaft side terminals 6A, 6B are provided on the device shaft 5, it is preferable that the entire pair of terminals 6A, 6B is accommodated inside the through hole 13 of the port site 2 while the pair of terminals 6A, 6B is in contact with the terminals 3A, 3B. In this way, it is possible to prevent the practitioner, etc. from receiving an electric shock due to contact with the terminals 6A, 6B.

[0069] Furthermore, it is preferable that the interval K (FIG. 8) between two pairs of shaft side terminals 6A, 6B adjacent in the axial direction of the device shaft 5 is equal to the length L of the port site side terminals 3A, 3B. In this way, immediately after one pair of terminals 6A, 6B separates from the terminals 3A, 3B, the other pair of terminals 6A, 6B can be brought into contact with the terminals 3A, 3B (in the illustrated example, immediately after the terminals 6Aa, 6Ba separate from the terminals 3A, 3B, the terminals 6Ab, 6Bb can be brought into contact with the terminals 3A, 3B). This makes it possible to continue supplying DC power to the power receiving unit J while minimizing the number of terminals 6 provided on the shaft 5.

[0070] In the above embodiment, the shaft side terminals 6A, 6B are fixed to the outer surface of the device shaft 5 using screws or adhesive, but the shaft side terminals 6A, 6B may be attached to the outer surface of the device shaft 5 via a spring. An example of a power supply device in which this modification is made will be described with reference to Figs. 9 to 12.

[0071] Fig. 9 is a schematic longitudinal sectional view of a power supply unit according to a modified example of the present invention. Fig. 10 is a schematic transverse sectional view showing a state in which the power supply unit is cut at the position of line AA shown in Fig. 9(a). Fig. 11 is a schematic longitudinal sectional view showing an enlarged portion of the power supply unit shown in Fig. 9. Fig. 12(a) is a schematic transverse sectional view of a port site 2 included in the power supply unit shown in Fig. 9, and Fig. 12(b) is a schematic transverse sectional view of a device shaft 5 included in the power supply unit shown in Fig. 9.

[0072] 9, a pair of shaft-side terminals 6C, 6D are provided on the outer surface of the device shaft 5. The shaft-side terminals 6C, 6D are each arranged in a recess 50 formed on the outer surface of the device shaft 5 while being supported by a spring (not shown). The spring is a leaf spring or a wood-burning spring, and is attached to the outer surface of the device shaft 5 (for example, the surface of the recess 50).

[0073] The shaft side terminals 6C, 6D are disposed to face each other in the radial direction F (FIG. 12(b)) of the device shaft 5, and the width Ha (FIG. 12(b)) of the shaft side terminals 6C, 6D is made shorter than the width Hb (FIG. 12(a)) of the gap S between the port site side terminals 3A, 3B. Note that, "the shaft side terminals 6C, 6D face each other in the radial direction F" means that the width center of the terminal 6C and the width center of the terminal 6D are positioned on the same straight line extending in the radial direction F.

[0074] A first shaft-side power supply line 7C is provided on the device shaft 5 as a power supply line for connecting the shaft-side terminal 6C and the power receiving unit J, and a second shaft-side power supply line 7D is provided as a power supply line for connecting the shaft-side terminal 6D and the power receiving unit J. The first and second shaft-side power supply lines 7C, 7D extend in the axial direction of the device shaft 5. The first shaft-side power supply line 7C passes through a recess 50 in which the shaft-side terminal 6C is disposed, and the second shaft-side power supply line 7D passes through a recess 50 in which the shaft-side terminal 6D is disposed.

[0075] While the shaft-side terminals 6C, 6D are positioned outside the port site 2, the compression length of the spring supporting the terminals 6C, 6D is small (the spring is only compressed by the weight of the shaft-side terminal 6). Therefore, the distances La, Lb (FIG. 12(b)) from the center of the device shaft 5 to the outer edges of the shaft-side terminals 6A, 6B are greater than the inner diameter R (FIG. 12(a)) of the through hole 13 of the port site 2, so that the shaft-side terminal 6C does not contact the first shaft-side power supply line 7C passing through the recess 50, and the shaft-side terminal 6D does not contact the second shaft-side power supply line 7D passing through the recess 50.

[0076] Then, by pressing the shaft-side terminals 6C, 6D with a finger or the like, the user compresses the springs supporting the terminals 6C, 6D and makes the distances La, Lb equal to the inner diameter R of the through-hole, so that the shaft-side terminal 6C can be brought into contact with the first shaft-side power supply line 7C passing through the recess 50, and the shaft-side terminal 6D can be brought into contact with the second shaft-side power supply line 7D passing through the recess 50, as shown in Fig. 10. In this state, the shaft-side terminals 6C, 6D are inserted into the through-hole 13 of the port site 2, and one terminal 6 of the shaft-side terminals 6C, 6D is brought into contact with the port site terminal 3A, and the other terminal 6 is brought into contact with the port site terminal 3B, thereby connecting the power supply side power supply path (the power supply path formed by the power supply lines 4A, 4B and the terminals 3A, 3B) and the power receiving unit J side power supply path (the power supply path formed by the terminals 6C, 6D and the power supply lines 7C, 7D). This makes it possible to supply DC power from the DC power source to the power receiving unit J and emit microwaves from the tip (blades 20, 20) of the device shaft 5. In addition, the reaction force of the spring against compression maintains the contact state between the port site side terminals 3A, 3B and the shaft side terminals 6C, 6D, so that power can be continuously supplied to the power receiving unit J.

[0077] In the power supply device of the above modification, it is preferable that the dimensions of the port site 2, the port site terminals 3A, 3B, and the shaft side terminals 6C, 6D are appropriately adjusted so that, when the port site terminals 3A, 3B are in contact with the shaft side terminals 6C, 6D, the shaft side terminals 6C, 6D are entirely housed inside the through hole 13 of the port site 2. In this way, it is possible to prevent the practitioner, etc. from receiving an electric shock by touching the shaft side terminals 6C, 6D.

[0078] 9, a plurality of sets of shaft-side terminals 6C, 6D may be provided at intervals in the axial direction of the device shaft 5. In this case, the first shaft-side power supply line 7C passes through the recess 50 in which one shaft-side terminal 6C of each set is disposed, and the second shaft-side power supply line 7D passes through the recess 50 in which the other shaft-side terminal 6D of each set is disposed (in the illustrated example, the set of terminals 6Ca, 6Da and the set of terminals 6Cb, 6Db are provided on the device shaft 5 at intervals, the first shaft-side power supply line 7C passes through the recess 50 in which the terminal 6Ca is disposed and the recess 50 in which the terminal 6Cb is disposed, and the second shaft-side power supply line 7D passes through the recess 50 in which the terminal 6Da is disposed and the recess 50 in which the terminal 6Db is disposed).

[0079] Then, of the pair of shaft side terminals 6C, 6D, one terminal 6C is brought into contact with the first shaft side power supply line 7C passing through the recess 50, and the other terminal 6D is brought into contact with the second shaft side power supply line 7D passing through the recess 50. In this state, the pair of shaft side terminals 6C, 6D are inserted into the through hole 13 of the port site 2, and one terminal 6C of the pair of shaft side terminals 6C, 6D is brought into contact with the port site side terminal 3A, and the other terminal 6D is brought into contact with the port site side terminal 3B. This makes it possible to supply DC power to the power receiving unit J, and to emit microwaves from the blades 20, 20 (the tips of the device shaft 5).

[0080] For example, as shown in Figures 9(a), 10, and 11, when the shaft side terminals 6Ca, 6Da are in contact with the power feeders 7C, 7D, respectively, and the shaft side terminals 6Ca, 6Da are in contact with the port site side terminals 3A, 3B, respectively, DC power from the DC power source can be supplied to the power receiving unit J via the power feeders 4A, 4B, terminals 3A, 3B, terminals 6Ca, 6Da, and power feeders 7C, 7D, so that microwaves can be emitted from the blades 20, 20.

[0081] Furthermore, as shown in FIG. 9(b), when the shaft side terminals 6Cb, 6Db are in contact with the power feeders 7C, 7D, respectively, and the shaft side terminals 6Cb, 6Db are in contact with the port site side terminals 3A, 3B, respectively, DC power from the DC power source can be supplied to the power receiving unit J via the power feeders 4A, 4B, terminals 3A, 3B, terminals 6Cb, 6Db, and power feeders 7C, 7D, so that microwaves can be emitted from the blades 20, 20.

[0082] Furthermore, when multiple sets of shaft side terminals 6C, 6D are provided on the device shaft 5 as described above, it is preferable that one set of shaft side terminals 6C, 6D be in contact with the port site side terminals 3A, 3B and the entire set of shaft side terminals 6C, 6D be housed inside the through hole 13 of the port site 2. In this way, it is possible to prevent the practitioner, etc. from receiving an electric shock when touching the shaft side terminals 6C, 6D.

[0083] In addition, it is preferable that the interval M (FIG. 11) between two pairs of shaft side terminals 6C, 6D adjacent to each other in the axial direction of the device shaft 5 is equal to the length L of the port site side terminals 3A, 3B. In this way, immediately after one pair of terminals 6C, 6D is separated from the terminals 3A, 3B, another pair of terminals 6C, 6D can be brought into contact with the terminals 3A, 3B (in the illustrated example, immediately after the terminals 6Ca, 6Da are separated from the terminals 3A, 3B, the terminals 6Cb, 6Db can be brought into contact with the terminals 3A, 3B). This makes it possible to continue supplying DC power to the power receiving unit J while minimizing the number of shaft side terminals 6.

[0084] In the illustrated example, one first shaft-side power supply line 7C is shared for connecting each pair of shaft-side terminals 6C (6Ca, 6Cb) to the power receiving unit J, and one second shaft-side power supply line 7D is shared for connecting each pair of shaft-side terminals 6D (6Da, 6Db) to the power receiving unit J, but a shaft-side power supply line 7 for connecting to the power receiving unit J may be provided for each of the shaft-side terminals 6C, 6D. For example, as in the illustrated example, when a pair of terminals 6Ca, 6Da and a pair of terminals 6Cb, 6Db are provided, a power supply line 7 for connecting the terminal 6Ca to the power receiving unit J, a power supply line 7 for connecting the terminal 6Cb to the power receiving unit J, a power supply line 7 for connecting the terminal 6Da to the power receiving unit J, and a power supply line 7 for connecting the terminal 6Db to the first microwave oscillator 8 may be provided on the device shaft 5.

[0085] When a plurality of sets of shaft-side terminals 6C, 6D are provided on the device shaft 5, the power supply device of the present invention can be modified as shown in Figs. 13 to 16. Figs. 13 and 14 are schematic vertical cross-sectional views showing a power supply device according to a modified example of the present invention, Fig. 13 shows a state in which the shaft-side terminals 6Ca, 6Da contact the port site-side terminals 3A, 3B, and Fig. 14 shows a state in which the shaft-side terminals 6Cb, 6Db contact the port site-side terminals 3A, 3B. Fig. 15 is an enlarged cross-sectional view of a portion of Fig. 13, and Fig. 16 is an enlarged cross-sectional view of a portion of Fig. 14.

[0086] 13 to 16, the first shaft-side power supply line 7C is made up of a plurality of first wires 70 connected in the axial direction of the device shaft 5, and the second shaft-side power supply line 7D is made up of a plurality of second wires 71 connected in the axial direction of the device shaft 5. In the following, an example will be described in which the power supply line 7C is made up of two first wires 70A, 70B and the power supply line 7D is made up of two second wires 71A, 71B as shown in Figs. 13 and 14, but the number of wires 30, 31 constituting the power supply lines 7C, 7D is not limited to two and may be three or more depending on the number of pairs of shaft-side terminals 6C, 6D.

[0087] Of the multiple first wires 70A, 70B constituting the first shaft-side power supply line 7C, the first wire 70B arranged closest to the power receiving unit J has one end 70a on the power receiving unit proximal side connected to the power receiving unit J and the other end 70b on the power receiving unit distal side extending into the recess 50B formed closest to the power receiving unit J among the recesses 50A, 50B in which one 6C of each pair of shaft-side terminals 6C, 6D is arranged. The remaining first wires 70A have one end 70a on the power receiving unit proximal side and the other end 70b on the power receiving unit distal side extending into "the recesses 50A, 50B in which one 6C of each pair of shaft-side terminals 6C, 6D is arranged, which are adjacent to each other in the axial direction of the device shaft 5."

[0088] The first wires 70A, 70B constituting the power supply line 7C are arranged in the recess 50 with the other end 70b supported by a spring (not shown). By pushing the shaft terminal 6C into the recess 50, the shaft terminal 6C can be brought into contact with the other end 70b of the first wire 70 arranged in the recess 50 (for example, by pushing the shaft terminal 6Ca into the recess 50A, the shaft terminal 6Ca can be brought into contact with the other end 70b of the first wire 70A). The spring is a leaf spring or a coil spring, and is attached to the outer surface of the device shaft 5 (for example, the surface of the recess 50).

[0089] In the recess 50B from which the ends 70a, 70b of two adjacent first wires 70A, 70B extend (i.e., in the recess 50B from which one end 70a of the first wire 70A on the distal side of the power receiving portion and the other end 70b of the first wire 70B on the proximal side of the power receiving portion extend), when the shaft side terminal 6Cb is not pressed into the recess 50B, as shown in Figure 15, the other end 70b of the first wire 70B on the proximal side of the power receiving portion is lifted up by the elastic force of the spring and comes into contact with one end 70a of the first wire 70A on the distal side of the power receiving portion. As shown in Figure 16, when the shaft side terminal 6Cb is pressed into the recess 50B, the shaft side terminal 6Cb pushes and moves the other end 70b of the first wire 70B on the proximal side of the power receiving unit, so that the other end 70b of the first wire 70B on the proximal side of the power receiving unit becomes separated from the one end 70a of the first wire 70A on the distal side of the power receiving unit.

[0090] 13 and 14, among the second wires 71A, 71B constituting the second shaft-side power supply line 7D, the second wire 71B arranged closest to the power receiving unit J has one end 71a on the power receiving unit proximal side connected to the power receiving unit J and the other end 71b on the power receiving unit distal side extending into the recess 50D formed closest to the power receiving unit J among the recesses 50C, 50D in which the other terminal 6B of each pair of shaft-side terminals 6A, 6B is arranged, as shown in FIG. 14. The remaining second wire 71A has one end 71a on the power receiving unit proximal side and the other end 71b on the power receiving unit distal side extending into "the recesses 50C, 50D in which the other terminal 6B of each pair of shaft-side terminals 6A, 6B is arranged, which are formed adjacent to each other in the axial direction of the device shaft 5."

[0091] The second wires 71A, 71B constituting the power supply line 7D are arranged in the recess 50 with the other ends 71b, 71b supported by springs (not shown), and the shaft terminal 6D arranged in the recess 50 can be pressed into contact with the other ends 71b of the second wires 71 (for example, the shaft terminal 6Da can be pressed into the recess 50C to bring the shaft terminal 6Da into contact with the other ends 71b of the second wires 71A). The spring is a leaf spring or a coil spring, and is attached to the outer surface of the device shaft 5 (for example, the surface of the recess 50).

[0092] In the recess 50D from which the ends 71a, 71b of two adjacent second wires 71A, 71B extend (i.e., in the recess 50D from which one end 71a of the second wire 71A on the distal side of the power receiving portion and the other end 71b of the second wire 71A on the proximal side of the power receiving portion extend), when the shaft side terminal 6Db is not pressed into the recess 50D, as shown in Figure 15, the other end 71b of the second wire 31B on the proximal side of the power receiving portion is lifted up by the elastic force of the spring and comes into contact with one end 71a of the second wire 71A on the distal side of the power receiving portion. Then, as shown in Figure 16, when the shaft side terminal 6Db is pushed into the recess 50D, the shaft side terminal 6Db pushes and moves the other end 71b of the second wire 71B on the proximal side of the power receiving unit, so that the other end 71b of the second wire 71B on the proximal side of the power receiving unit becomes separated from one end 71a of the second wire 71A on the distal side of the power receiving unit.

[0093] The power feeder shown in FIGS. 13 to 16 has the above-mentioned configuration, and in a state in which one shaft side terminal 6C of a pair of shaft side terminals 6C, 6D is pressed into the recess 50 and brought into contact with the other end 70b of one first wire 70 extending into the recess 50, and the other shaft side terminal 6D is pressed into the recess 50 and brought into contact with the other end 71b of one second wire 71 extending into the recess 50, the pair of shaft side terminals 6C, 6D are inserted into the through hole 13 of the port site 2, and one 6C of the pair of shaft side terminals 6C, 6D is inserted into the through hole 13 of the port site 2. By bringing the first and second port site side power feed lines 4A, 4B into contact with one of the pair of shaft side terminals 6C, 6D and bringing the other 6D of the pair of shaft side terminals 3A, 3B into contact with the other of the pair of shaft side terminals 3A, 3B (FIG. 16), power from the power source can be supplied to the power receiving unit J by the first and second port site side power feed lines 4A, 4B, the pair of port site side terminals 3A, 3B, the pair of shaft side terminals 6C, 6D, the range of the first shaft side power feed line 7C extending from the other end 70b of the one first wire 70 to the power receiving unit J side, and the range of the second shaft side power feed line 7D extending from the other end 70b of the one second wire 71 to the power receiving unit J side.

[0094] For example, as shown in FIG. 16, when the shaft side terminal 6Cb is in contact with the other end 70b of the first wire 70B and the port site side terminal 3A, and the shaft side terminal 6Db is in contact with the other end 71b of the second wire 71B and the port site side terminal 3A, power from the power source can be supplied to the power receiving unit J via the power feeders 4A, 4B, the port site side terminals 3A, 3B, the shaft side terminals 6C, 6D, the first wire 70B (the range of the first shaft side power feeder 7C extending from the other end 70b of the first wire 70B to the power receiving unit side), and the second wire (the range of the second shaft side power feeder 7D extending from the other end 70b of the second wire 71B to the power receiving unit side).

[0095] 13, by performing the above-mentioned "operation of pushing one shaft side terminal 6C of a pair of shaft side terminals 6C, 6D into the recess 50 to contact the other end 70b of one first wire 70 extending into the recess 50, and pushing the other shaft side terminal 6D into the recess 50 to contact the other end 71b of one second wire 71 extending into the recess 50," it is possible to prevent the other end 70b of one first wire 70 from contacting the one end 70a of the first wire 70 on the power receiving unit distal side, and the other end 71b of one second wire 71 from contacting the one end 71a of the second wire 70 on the power receiving unit distal side. This makes it possible to prevent power from flowing to the first wire 70 located on the power receiving unit distal side of the first wire 70 and the second wire 71 located on the receiving unit distal side of the second wire 71.

[0096] For example, in the state shown in Figure 16, the other end 70b of the first wire 70B does not contact one end 70a of the first wire 70A on the distal side of the power receiving portion, and the other end 71b of the second wire 71B does not contact one end 71a of the second wire 71A on the distal side of the power receiving portion, so that no power flows between the first wire 70A and the second wire 71A.

[0097] In the power supply device shown in Figures 1 to 16, an insulator 51 may be provided in the gap S between one ends of the port site terminals 3A, 3B and in the gap S between the other ends of the port site terminals 3A, 3B (Figure 17(a) shows a modified example in which an insulator 51 is provided in the power supply device shown in Figures 1 to 8, and Figure 17(b) shows a modified example in which an insulator 51 is provided in the power supply device shown in Figures 9 to 12). The insulator 51 is made of rubber, resin, or the like, and is fixed to the inner surface of the port site 2 using an adhesive or the like.

[0098] 1 to 17, it is preferable that the power receiving unit J (microwave output unit) is capable of supplying microwave power of 20 W or more and 100 W or less to the tip of the device shaft 5. In this way, the microwave power required for a surgical procedure such as hemostasis can be supplied to the tip of the device shaft 5, and the dimensions, volume, and weight of the power receiving unit J can be suppressed to about 50 mm x 100 mm x 5 mm, a single digit cubic centimeter, and a single digit g (for example, about 5 g), respectively, making it easy to incorporate the power receiving unit J (microwave output unit) into the gripping portion 5a of the device shaft 5.

[0099] When microwaves are supplied directly from the outside as in the conventional case, it is necessary to use a thick and rigid coaxial cable with a diameter of about 10 mm. According to the power supply device shown in Figs. 1 to 17, it is easy to realize the power conversion efficiency of the microwave amplifier 9 to be about 50% by supplying DC power to the power receiving unit J. In order to supply microwave power of 20 W or more and 100 W or less to the tip of the device shaft 5 in this way, it is sufficient to make the power supplied to the power receiving unit J 200 W or less, so that an extremely thin power supply line with a diameter of about 1 mm can be used as the port site side power supply line 4 and the shaft side power supply line 7. In this way, since the port site side power supply line 4 is an extremely thin power supply line, the operability of the device shaft 5 when the device shaft 5 is inserted into the port site 2 can be significantly improved.

[0100] In order to supply microwave power suitable for surgery using the ultra-thin power feeders 4 and 7 as described above, the frequency of the microwave emitted from the tip of the device shaft 5 is preferably 300 MHz or more and 6 GHz or less, more preferably 2.45 GHz±50 MHz. The power conversion efficiency of the microwave amplifier (the ratio of the microwave power output to the DC power used) is preferably 30% or more and 80% or less, more preferably 50% or more. The microwave output supplied to the tip of the device shaft 5 is preferably 20 W or more and 100 W or less, more preferably 30 W or more and 60 W or less. The DC power supplied to the power receiving unit J is preferably 10 W or more and 150 W or less, more preferably 50 W or more and 100 W or less.

[0101] Furthermore, for example, by using a gallium nitride transistor in the microwave amplifier 9, it is possible to achieve a power conversion efficiency of 50% or more for the microwave amplifier 9. In particular, high power conversion efficiency can be obtained by using a gallium nitride HEMT (high electron mobility transistor). By using the microwave amplifier 9 with high power conversion efficiency, the power that needs to be supplied from outside can be reduced, allowing the power feeders 4 and 7 to be made thinner and lighter.

[0102] In the above-mentioned power supply device, the power receiving unit J may include a DC power supply unit and a microwave output unit. In this case, the DC power supply unit is configured to include a microwave oscillator that oscillates microwaves and a microwave amplifier that amplifies the microwaves, and DC power supplied from an external source is used as a DC power supply (operation source) that operates the microwave oscillator and the microwave amplifier. In the above case, a voltage control unit capable of controlling voltage and the like may be added to the microwave output unit. In the above case, an impedance matching circuit and an output control circuit and the like may be added to the power receiving unit J.

[0103] In the above example, the microwave oscillator 8 and the microwave amplifier 9 are connected by a coaxial cable. However, when the microwave oscillator 8 and the microwave amplifier 9 are disposed close to each other or when the microwave oscillator 8 and the amplifier 9 are formed on the same circuit board, the microwave oscillator 8 and the microwave amplifier 9 may be connected by a microwave transmission line such as a microstrip line.

[0104] The above-mentioned power supply device may also include a power receiving unit J that outputs microwaves when AC power is supplied from an AC power source. The AC power mentioned here means commercial frequency AC power (in Japan, the frequency is 50 Hz or 60 Hz, and the voltage is about 100 V) supplied to household power distribution lines.

[0105] In the above case, AC power is supplied from an AC power source to the power receiving unit J via the port site side power feeders 4A, 4B and the shaft side power feeders 7A, 7B or 7C, 7D, using AC power feeders as the port site side power feeders 4A, 4B and the shaft side power feeders 7A, 7B or 7C, 7D. The power receiving unit J includes at least a converter, a microwave transmitter, and a microwave amplifier. The converter converts the AC power supplied from the AC power source to the power receiving unit J into DC power. The microwave oscillator uses the DC power converted by the converter as a DC power source (operating source) to oscillate microwaves. The microwave oscillator uses the DC power converted by the converter as a DC power source (operating source) to amplify microwaves.

[0106] When AC power is supplied to the power receiving unit J as described above, it is easy to set the power conversion efficiency of the AC power to DC power converter to about 90%, and therefore it is easy to set the AC power supplied to the power receiving unit J to 1.11 times the power when DC power is supplied to the power receiving unit J. And, as described above, if the power conversion efficiency of the AC power to DC power converter is set to about 90% and the AC power supplied to the power receiving unit J is set to 1.11 times the power, it is possible to obtain the same effect as when DC power is supplied to the power receiving unit J under conditions using extremely thin power feeders that are almost the same as when DC power is supplied to the power receiving unit J.

[0107] 1 to 17 may be modified to include a power receiving unit N capable of outputting high frequency waves by receiving DC power from a DC power source. In this case, the power feeder shown in Fig. 1 to 17 includes a power receiving unit N including a high frequency oscillator 31 and a high frequency amplifier 32, a third coaxial cable 33, and a fourth coaxial cable 34, instead of the power receiving unit J, first coaxial cable 10, and second coaxial cable 11 (see the symbols in parentheses in Figs. 1, 6, 7, 9, 13, and 14).

[0108] The power receiving unit N including the high-frequency oscillator 31 and the high-frequency amplifier 32 is housed inside the gripping portion 5a on the base end side of the device shaft 5. The third coaxial cable 33 and the fourth coaxial cable 34 are provided on the device shaft 5, with the third coaxial cable 33 connecting the high-frequency oscillator 31 and the high-frequency amplifier 32, and the fourth coaxial cable 34 connecting the high-frequency amplifier 32 and the tip end portion (blades 20, 20) of the device shaft 5.

[0109] In the power supply device of the modified example having the above configuration, when the device shaft 5 is inserted through the through hole 13 of the port site 2 and the port site side terminal 3 and the shaft side terminal 6 are in contact with each other, the power supply device supplies DC power from a DC power source to the power receiving unit N via the port site side power supply wires 4A, 4B, the port site side terminals 3A, 3B, the shaft side terminals 6A, 6B or 6C, 6D, and the shaft side power supply wires 7A, 7B or 7C, 7D to cause the high frequency oscillator 31 to oscillate a high frequency wave, and supplies the high frequency wave to the high frequency amplifier 32 via the third coaxial cable 33 for amplification, and supplies the amplified high frequency wave to the tip end (blade 20, 20) of the device shaft 5 via the fourth coaxial cable 34 for emission. According to the above power supply device, the high frequency wave emitted from the tip end (blade 20, 20) of the device shaft 5 can be used to cauterize the surgical site, stop bleeding, cut, etc. The frequency of the high frequency wave emitted from the tip of the device shaft 5 is preferably 150 KHz to 10 MHz.

[0110] 1 to 17 may be modified to include a power receiving unit N capable of outputting high frequency waves by receiving AC power from an AC power source. In this case, the power receiving unit N includes at least a converter, a high frequency oscillator, and a high frequency amplifier. AC power feed lines are used as the port site side power feed lines 4A and 4B and the shaft side power feed lines 7A and 7B or 7C and 7D, and the port site side power feed line 4A connects the port site side terminal 3A and a first pole of the AC power source, and the port site side power feed line 4B connects the port site side terminal 3B and a second pole of the AC power source. When the device shaft 5 is inserted through the through hole 13 of the port site 2 and the port site side terminal 3 and the shaft side terminal 6 are in contact with each other, AC power from the AC power source is supplied to the power receiving unit N through the port site side power feed lines 4A, 4B, the port site side terminals 3A, 3B, the shaft side terminals 6A, 6B or 6C, 6D, and the shaft side power feed lines 7A, 7B or 7C, 7D. The converter converts the AC power supplied from the AC power source to the power receiving unit N into DC power. The high-frequency wave oscillator uses the DC power converted by the converter as a DC power source (operating source) to oscillate a high-frequency wave. The high-frequency amplifier uses the DC power converted by the converter as a DC power source (operating source) to amplify the high-frequency wave.

[0111] Furthermore, the function of the device shaft 5 included in the power supply device of the present invention is not limited to the above-mentioned functions, and may be various functions that can be implemented by supplying power. The use of the power supply device of the present invention is also not limited to hemostasis, and may be various uses depending on the function of the device shaft 5. In the above example, the power receiving unit is provided at the base end of the device shaft 5, but depending on the use of the power supply device, the power receiving unit may be provided at the tip end of the device shaft 5 and power may be supplied to the power receiving unit. [Explanation of symbols]

[0112] 2 port site, 3,3A,3B Port site side terminal, 4, 4A, 4B Port site side power supply line, 5 device shaft, 6, 6A, 6Aa, 6Ab, 6B, 6Ba, 6Bb, 6C, 6Ca, 6Cb, 6D, 6Da, 6Db Shaft side terminal, 7,7A,7Aa,7Ab,7B,7Ba,7Bb,7C,7D Shaft side power supply line, 8 microwave oscillator, 9 Microwave Amplifiers, 12 Cylindrical cover, 13 Port site through hole, 40 Air supply tube, 50, 50A, 50B, 50C, 50D recesses, 70,70A,70B first wire material, 70a one end of a first wire; 70b the other end of the first wire; 71,71A,71B second wire rod, 71a one end of a second wire; 71b the other end of the second wire; J,N Power receiving section

Claims

1. a port site formed from an insulating material and having a through hole; a port site side terminal provided on an inner surface of the through hole of the port site; a port site side power supply line connecting the port site side terminal and a power source; A device shaft that can be inserted into the through hole; A power receiving portion provided on the device shaft; a shaft side terminal provided on an outer surface of the device shaft; a shaft-side power supply line provided on the device shaft and connecting the power receiving unit and the shaft-side terminal; A cylindrical cover formed of a stretchable insulating material, The device shaft can be inserted into the through hole of the port site to bring the port site side terminal into contact with the shaft side terminal, when the port site side terminal and the shaft side terminal are in contact with each other, power from the power source can be supplied to the power receiving unit by the port site side power feed line, the port site side terminal, the shaft side terminal, and the shaft side power feed line; The cylindrical cover is provided so that the device shaft passes through the inside thereof, and one end of the cylindrical cover is fixed to an outer surface of a midpoint of the device shaft, the shaft side terminal is provided on the tip side of the device shaft relative to the intermediate position, a power supply device in which, when the port site side terminal and the shaft side terminal are in contact with each other, one end of the cylindrical cover contacts one end of the port site, and the entire shaft side terminal in contact with the port site side terminal is accommodated within a space formed by the inside of the cylindrical cover and the through hole of the port site.

2. The port site further includes an air supply tube connected thereto, 2. The power supply unit according to claim 1, wherein the gas flowing through the gas supply tube is introduced into the through hole and discharged from an opening of the through hole at the other end of the port site.

3. The power supply unit according to claim 1 or 2, wherein when the port site side terminal and the shaft side terminal are in contact with each other, the entire shaft side terminal in contact with the port site side terminal is located inside the through hole.

4. As the port site side terminal, a pair of the port site side terminals arranged to face each other in a radial direction of the port site are provided, As the port site side power feed line, a first port site side power feed line for connecting one of the port site side terminals and a power source, and a second port site side power feed line for connecting the other port site side terminal and a power source are provided, As the shaft side terminal, a pair of shaft side terminals is provided that is arranged to face each other in a radial direction of the device shaft, As the shaft-side power supply line, a first shaft-side power supply line for connecting one of the shaft-side terminals and a power receiving unit, and a second shaft-side power supply line for connecting the other shaft-side terminal and a power receiving unit are provided, 4. The power supply device according to claim 1, wherein the pair of shaft side terminals are inserted into through holes at the port site, one of the pair of shaft side terminals is brought into contact with one of the pair of port site side terminals, and the other of the pair of shaft side terminals is brought into contact with the other of the pair of shaft side terminals, thereby enabling power from the power source to be supplied to the power receiving unit by the first and second port site side power supply lines, the pair of port site side terminals, the pair of shaft side terminals, and the first and second shaft side power supply lines.

5. In a circumferential direction of the port site, a gap is provided between one ends of the pair of port site side terminals and between the other ends of the pair of port site side terminals, The power supply unit according to claim 4 , wherein a width of each of the pair of shaft side terminals is smaller than a width of the gap.

6. a plurality of pairs of the shaft side terminals are provided at intervals in the axial direction of the device shaft, As the shaft-side power supply line, a first shaft-side power supply line for connecting one of the pair of shaft-side terminals of each set to a power source and a second shaft-side power supply line for connecting the other of the pair of shaft-side terminals of each set to a power source are provided, 6. The power supply device according to claim 4 or 5, wherein the power supply from the power source can be supplied to the power receiving unit by the first and second port site side power feed lines, the pair of port site side terminals, the pair of shaft side terminals, and the first and second shaft side power feed lines, by inserting the pair of shaft side terminals into a through hole at the port site, bringing one of the pair of shaft side terminals into contact with one of the pair of port site side terminals, and bringing the other of the pair of shaft side terminals into contact with the other of the pair of shaft side terminals.

7. 7. The power supply device according to claim 6, wherein when one of the set of shaft side terminals is in contact with one of the pair of port site side terminals and the other of the set of shaft side terminals is in contact with the other of the pair of shaft side terminals, the entire set of shaft side terminals is accommodated inside the through hole of the port site.

8. 8. The power supply unit according to claim 6, wherein a distance between two pairs of the shaft side terminals adjacent to each other in an axial direction of the device shaft is equal to a length of the pair of the port site side terminals.

9. the pair of shaft side terminals of each set are supported by a spring and disposed in a recess formed on an outer surface of the device shaft; the first shaft-side power supply wire passes through the recess in which one of the pair of shaft-side terminals of each set is disposed, and the second shaft-side power supply wire passes through the recess in which the other of the pair of shaft-side terminals of each set is disposed, 9. The power supply device according to claim 6, wherein one of the pair of shaft side terminals is pressed down to contact the first shaft side power supply line passing through the recess and the other shaft side terminal is pressed down to contact the second shaft side power supply line passing through the recess, and then the set of shaft side terminals is inserted into a through hole at the port site to bring one of the set of shaft side terminals into contact with one of the pair of port site side terminals and the other of the set of shaft side terminals into contact with the other of the pair of shaft side terminals, thereby enabling power from the power source to be supplied to the power receiving unit by the first and second port site side power supply lines, the pair of port site side terminals, the set of the pair of shaft side terminals, and the first and second shaft side power supply lines.

10. the first shaft-side power supply line is made of a plurality of first wires arranged in series in the axial direction of the device shaft, and the second shaft-side power supply line is made of a plurality of second wires arranged in series in the axial direction of the device shaft, Among the plurality of first wires, the first wire closest to the power receiving unit has one end proximal to the power receiving unit connected to the power receiving unit and the other end distal to the power receiving unit extending into the recess closest to the power receiving unit among the recesses in which one of the pair of shaft side terminals of each set is arranged, and the remaining first wires have one end proximal to the power receiving unit and the other end distal to the power receiving unit extending into the recess in which one of the pair of shaft side terminals of each set is arranged, the recess being adjacent in the axial direction of the device shaft, the first wires are each disposed in the recess with the other end supported by a spring, and the shaft side terminal can be brought into contact with the other end of the first wire disposed in the recess by pushing the shaft side terminal into the recess, In the recess from which one end of the first wire on the distal side of the power receiving unit and the other end of the first wire on the proximal side of the power receiving unit extend, when the shaft side terminal is not pressed into the recess, the other end of the first wire on the proximal side of the power receiving unit is lifted by the elastic force of a spring, thereby coming into contact with the one end of the first wire on the distal side of the power receiving unit; and when the shaft side terminal is pressed into the recess, the shaft side terminal pushes and moves the other end of the first wire on the proximal side of the power receiving unit, thereby separating the other end of the first wire on the proximal side of the power receiving unit from the one end of the first wire on the distal side of the power receiving unit. Among the plurality of second wires, the second wire closest to the power receiving unit has one end on the proximal side of the power receiving unit connected to the power receiving unit and the other end on the distal side of the power receiving unit extending into the recess closest to the power receiving unit among the recesses in which the other of the pair of shaft side terminals of each set is arranged, and the remaining second wires have one end on the proximal side of the power receiving unit and the other end on the distal side of the power receiving unit extending into the recess in which the other of the pair of shaft side terminals of each set is arranged, the recess being adjacent in the axial direction of the device shaft, the second wires are each disposed in the recess with the other end supported by a spring, and the shaft side terminal can be brought into contact with the other end of the second wire disposed in the recess by pressing the shaft side terminal into the recess, 10. The power supply unit of claim 9, wherein, in the recess from which one end of the second wire on the distal side of the power receiving unit and the other end of the first wire on the proximal side of the power receiving unit extend, when the shaft side terminal is not pressed into the recess, the other end of the second wire on the proximal side of the power receiving unit is lifted by the elastic force of a spring and comes into contact with the one end of the second wire on the distal side of the power receiving unit, and when the shaft side terminal is pressed into the recess, the shaft side terminal pushes and moves the other end of the second wire on the proximal side of the power receiving unit, so that the other end of the second wire on the proximal side of the power receiving unit is separated from the one end of the second wire on the distal side of the power receiving unit.

11. The power source is a DC power source or an AC power source, The power feeder according to claim 1 , wherein the power receiving unit outputs microwaves when DC power or AC power is supplied from the power source.

12. The power source is a DC power source or an AC power source, The power supply unit according to claim 1 , wherein the power receiving unit outputs a high-frequency wave when DC power or AC power is supplied from the power source.

13. a port site formed from an insulating material and having a through hole; a port site side terminal provided on an inner surface of the through hole of the port site; a port site side power supply line connecting the port site side terminal and a power source; A device shaft that can be inserted into the through hole; A power receiving portion provided on the device shaft; a shaft side terminal provided on an outer surface of the device shaft; a shaft-side power supply line provided on the device shaft and connecting the power receiving unit and the shaft-side terminal; The power receiving unit includes at least a microwave oscillator and a microwave amplifier, The device shaft can be inserted into the through hole of the port site to bring the port site side terminal into contact with the shaft side terminal, When the port site side terminal and the shaft side terminal are in contact with each other, power from the power source is supplied to the power receiving unit via the port site side power feed line, the port site side terminal, the shaft side terminal, and the shaft side power feed line, the power source is a DC power source, The microwave oscillator oscillates microwaves using DC power supplied from the power source to the power receiving unit as a DC power source, and the microwave amplifier amplifies the microwaves using the DC power supplied from the power source to the power receiving unit as a DC power source.

14. a port site formed from an insulating material and having a through hole; a port site side terminal provided on an inner surface of the through hole of the port site; a port site side power supply line connecting the port site side terminal and a power source; A device shaft that can be inserted into the through hole; A power receiving portion provided on the device shaft; a shaft side terminal provided on an outer surface of the device shaft; a shaft-side power supply line provided on the device shaft and connecting the power receiving unit and the shaft-side terminal; The power receiving unit includes at least a converter, a microwave oscillator, and a microwave amplifier, The device shaft can be inserted into the through hole of the port site to bring the port site side terminal into contact with the shaft side terminal, When the port site side terminal and the shaft side terminal are in contact with each other, power from the power source is supplied to the power receiving unit via the port site side power feed line, the port site side terminal, the shaft side terminal, and the shaft side power feed line, the power source is an AC power source, The converter converts AC power supplied from the power source to the power receiving unit into DC power, the microwave oscillator uses the DC power converted by the converter as a DC power source to oscillate microwaves, and the microwave oscillator uses the DC power converted by the converter as a DC power source to amplify the microwaves.

15. 15. The power supply unit according to claim 13, wherein the microwave frequency is 2.45 GHz±50 MHz, the power conversion efficiency of the microwave amplifier is 50% or more, and the power supplied from the power source to the power receiving unit is 10 W or more and 150 W or less.

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