Power feeder

Abstract

Provided is a power feeder that has a port site into which a shaft provided with a power receiving unit is inserted, the power feeder making it possible to implement electric current feeding to the power receiving unit at a low cost. A power feeder (1) according to the present invention is capable of bringing ring-side terminals (4A, 4B) and shaft-side terminals (8A, 8B) into contact with each other as a shaft (6) is inserted into a power feeding ring (14) and into a port site (2). When the ring-side terminals (4A, 4B) and the shaft-side terminals (8A, 8B) are in contact with each other, power from a power source is allowed to be fed to a power receiving unit (7) through ring-side power feeding lines (5A, 5B), the ring-side terminals (4A, 4B), the shaft-side terminals (8A, 8B), and shaft-side power feeding lines (9A, 9B).

Description

Technical Field

[0001] The present invention relates to a power feeder capable of supplying power to a power receiving unit provided on a shaft when a shaft through which a surgical device such as a microwave forceps is mounted is inserted inside a port site.

Background Art

[0002] In recent years, most surgeries are in a situation of shifting to robot-assisted surgeries and endoscopic surgeries. In these surgeries, surgical devices having a shaft for performing surgery inside a subject's body are used. As this type of surgical device, there is one including a port site drilled in a subject's body wall and a shaft inserted into the body through a through hole of the port site, and which emits microwaves from the tip of the shaft to cauterize a bleeding site.

[0003] In the above device, in order to directly supply microwaves to the shaft, a thick and rigid coaxial cable is connected to the shaft. Therefore, when the above device is used multiple times in surgery, multiple coaxial cables will complicate the space on the operating table and become extremely obstructive.

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

[0005] In recent years, battery-powered high-frequency devices have also been proposed as alternatives to the coaxial cables mentioned above, but it has been pointed out that the battery life, weight, and size do not meet the required standards.

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

[0007] [Patent Document 1] Japanese Patent Publication No. 2015-123117 [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] The present invention has been made in view of the above matters, and its object is to provide a power supply in which a shaft on which a power receiving section is provided is inserted into the inside of a port site, and which can supply current to the power receiving section at a low cost. [Means for solving the problem]

[0009] To achieve the above objectives, the present invention encompasses the subject matter described in the following sections.

[0010] Item 1. A port site formed from an insulating material and exhibiting a tubular shape, A power supply ring formed from an insulating material, The ring-side terminal is provided on the inner surface of the power supply ring, A ring-side power supply line connects the ring-side terminal to the power supply, A shaft is sequentially inserted into the inside of the power supply ring and the inside of the port site, The power receiving unit provided on the shaft, A shaft-side terminal provided on the outer surface of the shaft, The shaft is provided with a shaft-side power supply line that connects the power receiving unit and the shaft-side terminal, As the shaft is inserted into the inside of the power supply ring and the inside of the port site, it is possible to bring the ring-side terminal and the shaft-side terminal into contact. A power supply that, when the ring-side terminal and the shaft-side terminal are in contact, can supply power from the power source to the power receiving unit via the ring-side power supply line, the ring-side terminal, the shaft-side terminal, and the shaft-side power supply line.

[0011] Item 2. The shaft comprises a shaft body on which the power receiving unit is provided, and a cylindrical sheet covering the outside of the shaft body, and the shaft-side terminal is provided on the outer surface of the cylindrical sheet. The shaft body is provided with a first connector and a first shaft-side power supply line connecting the power receiving unit and the first connector, and the cylindrical sheet is provided with a second connector and a second shaft-side power supply line connecting the shaft-side terminal and the second connector, and by connecting the first connector and the second connector, it is possible to connect the power receiving unit and the shaft-side terminal via the first shaft-side power supply line, the first connector, the second connector, and the second shaft-side power supply line. The power supply according to item 1, wherein, with the first connector and the second connector connected, the ring-side terminal and the shaft-side terminal are brought into contact as the shaft is inserted into the inside of the power supply ring and the inside of the port site, thereby enabling power from the power supply to be supplied to the power receiving unit via the ring-side power supply line, the ring-side terminal, the shaft-side terminal, the second shaft-side power supply line, and the first shaft-side power supply line.

[0012] Item 3. comprising a cylindrical body extending from one end of the port site, The cylindrical body is formed from an insulating material and comprises a connecting ring, a power supply ring, and a cylindrical body, wherein the connecting ring is attached to one end of the port site or molded integrally with one end of the port site, thereby connecting to one end of the port site, and the cylindrical body connects the connecting ring and the power supply ring. The cylindrical body is formed from a flexible insulating material, and the shaft is sequentially inserted into the interior of the cylindrical body and the interior of the port site. As the shaft is inserted into the interior of the cylindrical body and the interior of the port site, ring The ring-side terminal and the shaft-side terminal can be brought into contact by fitting one of their grooves into the other. The power supply according to item 1 or 2, wherein when the ring-side terminal and the shaft-side terminal are in contact, the cylindrical body expands and contracts as the shaft moves.

[0013] Item 4. The power supply according to Item 3, wherein the cylindrical body has a shape that decreases in diameter towards the power supply ring side.

[0014] Item 5. Equipped with a winding ring formed from an insulating material, The aforementioned winding ring is connected to one end of the port site, and the ring-side power supply wire can be wound around it. The power supply device according to item 1, wherein the shaft is sequentially inserted into the inside of the power supply ring, the winding ring, and the port site. [Effect of the Invention]

[0015] According to the power feeder of the present invention, power is supplied to the power receiving unit by a simple mechanism in which the power supply path on the power supply side (ring side power supply line and ring side terminal) and the power supply path on the power receiving unit side (shaft side terminal and shaft side power supply line) are connected by the contact between the ring side terminal and the shaft side terminal. Therefore, according to the power feeder of the present invention, supplying power to the power receiving unit can be realized at a low cost. [Brief Description of the Drawings]

[0016] ​​​​​​​​​​​​​​​​​​​​​​​​​​​ [Figure 10] This figure shows a modified power supply according to the present invention, where (A) is a schematic side view of the power supply and (B) is a schematic longitudinal cross-sectional view of the power supply. [Figure 11] This figure shows a modified power supply according to the present invention, where (A) shows a state in which the ring-side power supply wire is wrapped around the winding ring a small number of times, and (B) shows a state in which the ring-side power supply wire is wrapped around the winding ring a large number of times. [Figure 12] This figure shows a modified power supply according to the present invention, where (A) is a schematic side view of the power supply and (B) is a schematic longitudinal cross-sectional view of the power supply. [Figure 13] This is an enlarged view of area A in Figure 12(B). [Modes for carrying out the invention]

[0017] Embodiments of the present invention will be described below with reference to the accompanying drawings. Figure 1 is a schematic diagram showing the power supply 1 in use. Figure 2 is a diagram showing the power supply 1 according to an embodiment of the present invention, where (A) is a schematic side view of the power supply 1 and (B) is a schematic longitudinal cross-sectional view of the power supply 1. Figure 3 is a schematic cross-sectional view showing the power supply 1 cut along line AA in Figure 2(A). Figure 4 is a schematic cross-sectional view showing the power supply 1 cut along line BB in Figure 2(A). Figure 5 is a schematic longitudinal cross-sectional view showing a part of the power supply 1.

[0018] The power supply unit 1 of this embodiment is used for surgery inside the body of subject H (Figure 1). The power supply unit 1 of this embodiment comprises a port site 2, a cylindrical body 3, a pair of ring-side terminals 4A, 4B, ring-side power supply lines 5A, 5B, a shaft 6, a power receiving unit 7, a pair of shaft-side terminals 8A, 8B, shaft-side power supply lines 9A, 9B, a first coaxial cable 10, and a second coaxial cable 11.

[0019] The port site 2 is cylindrical and made of an insulating material such as resin. In the illustrated example, the port site 2 has a large diameter portion 2a forming one end from which an elongated small diameter portion 2b extends, and has a through hole 12 with a circular cross-section that penetrates the large diameter portion 2a and the small diameter portion 2b.

[0020] The cylindrical body 3 is attached to one end of the port site 2 (the large-diameter portion 2a in the illustrated example). The cylindrical body 3 comprises a connecting ring 13, a power supply ring 14, and a cylindrical body 15, with the cylindrical body 15 connecting the connecting ring 13 and the power supply ring 14.

[0021] The above-mentioned "connecting the connecting ring 13 and the power supply ring 14 with the cylindrical body 15" can be achieved, for example, by bonding the connecting ring 13 and the power supply ring 14 to the cylindrical body 15 with adhesive, or by welding the connecting ring 13 and the power supply ring 14 to the cylindrical body 15. Alternatively, the connecting ring 13, the cylindrical body 15, and the power supply ring 14 may be molded together beforehand so that the connecting ring 13 and the power supply ring 14 are connected by the cylindrical body 15.

[0022] The connecting ring 13 is formed from an insulating material such as resin and is connected to one end (large diameter portion 2a) of the port site 2 by being attached to the port site 2, or by being molded integrally with the port site 2. The above-mentioned "attaching the connecting ring 13 to one end of the port site 2" is achieved, for example, by providing a pin 20 (Figures 2(B), 3) that penetrates the wall of the connecting ring 13 in the radial direction of the connecting ring 13, and pressing the tip of the pin 20 against the port site 2 while the port site 2 (large diameter portion 2a) is inserted into the inside of the connecting ring 13. In this case, the connecting ring 13 is provided with the above-mentioned pin 20 and an elastic means (not shown) that biases the pin 20 radially inward of the connecting ring 13, and the tip of the pin 20 is pressed against the port site 2 by the biasing force of the elastic means. Furthermore, by pulling the pin 20 radially outward from the connecting ring 13 against the biasing force of the elastic means, the pressure of the tip of the pin 20 against one end of the port site 2 is released, and the connecting ring 13 is removed from one end of the port site 2. Note that "attaching the connecting ring 13 to one end of the port site 2" can also be achieved by inserting one end of the port site 2 (large diameter portion 2a) into the connecting ring 13 with the inner diameter of the connecting ring 13 matching the outer diameter of one end of the port site 2 (in this case, the connecting ring 13 is connected to one end of the port site 2 by the frictional force generated between the inner surface of the connecting ring 13 and the outer surface of one end of the port site 2). Furthermore, the above-mentioned "attaching the connecting ring 13 to one end of the port site 2" can also be achieved by inserting the connecting ring 13 into the interior of one end of the port site 2, with the outer diameter of the connecting ring 13 matching the inner diameter of one end of the port site 2 (in this case, the connecting ring 13 is connected to one end of the port site 2 by the frictional force generated between the outer surface of the connecting ring 13 and the inner surface of one end of the port site 2). Alternatively, the connecting ring 13 may be attached to one end of the port site 2 by bonding it to the port site 2 with an adhesive.

[0023] Figure 6(A) is a schematic cross-sectional view of the power supply ring 14, and Figure 6(B) is a schematic cross-sectional view showing the shaft 6 cut at the position where the shaft-side terminals 8A and 8B are provided.

[0024] The power supply ring 14 is made of an insulating material such as resin, and a pair of ring-side terminals 4A and 4B are provided on the inner surface of the power supply ring 14.

[0025] The ring-side terminals 4A and 4B are formed from metal. These terminals are positioned opposite each other in the radial direction E of the power supply ring 14 and are fixed to the power supply ring 14 using screws or adhesive. The fact that the ring-side terminals 4A and 4B are opposite each other in the radial direction E means that the width centers of terminal 4A and terminal 4B lie on the same straight line extending in the radial direction E. Each of the ring-side terminals 4A and 4B has a length of less than half the circumference of the power supply ring 14. In the circumferential direction of the power supply ring 14, there are gaps S between one end of the ring-side terminals 4A and 4B and between the other ends of the ring-side terminals 4A and 4B. The ring-side terminals 4A and 4B may also be formed by applying metal powder to the inner surface of the power supply ring 14.

[0026] As shown in Figures 2(B) and 5, in the axial direction of the power supply ring 14 (left-right direction in Figures 2 and 5), the ring-side terminals 4A and 4B have an arc shape that curves circumferentially outward in the radial direction of the power supply ring 14, thereby having a groove 21 that is recessed radially outward of the power supply ring 14. However, the present invention is not limited to the ring-side terminals 4A and 4B having the above-described arc shape. For example, the central part of the ring-side terminals 4A and 4B in the axial direction of the power supply ring 14 (left-right direction in Figures 2 and 5) may be formed to be of a thin thickness, so that the ring-side terminals 4A and 4B have a groove 21 that is recessed radially outward of the power supply ring 14.

[0027] The ring-side power lines 5A and 5B are DC power lines. One end of ring-side power line 5A is connected to one pole of the DC power supply, and the other end of ring-side power line 5A is connected to ring-side terminal 4A, thereby connecting one pole of the DC power supply to ring-side terminal 4A via ring-side power line 5A. One end of ring-side power line 5B is connected to the other pole of the DC power supply, and the other end of ring-side power line 5B is connected to ring-side terminal 4B, thereby connecting the other pole of the DC power supply to ring-side terminal 4B via ring-side power line 5B (in the illustrated example, a cable bundling ring-side power lines 5A and 5B is used, and the ring-side power lines 5A and 5B are separated at one end and the other end of the cable, and the above-mentioned connections of power lines 5A and 5B to the DC power supply and terminal 4 are made). The user can apply voltage to the ring-side terminals 4A and 4B via the ring-side power supply lines 5A and 5B by turning on a switch (such as a foot switch) connected to the DC power supply, and can stop the application of voltage to terminals 4A and 4B by turning off the switch.

[0028] The cylindrical body 15 is formed from a stretchable insulating material (e.g., resin). The ring-side power supply lines 5A and 5B are attached to the surface (outer or inner surface) of the cylindrical body 15 so as to extend spirally in the direction of extension of the cylindrical body 15 (in the illustrated example, the ring-side power supply lines 5A and 5B are attached to the outer surface of the cylindrical body 15). In order to connect one end of the ring-side power supply lines 5A and 5B to a DC power source and the other end of the ring-side power supply lines 5A and 5B to the ring-side terminals 4A and 4B, the ring-side power supply lines 5A and 5B are passed through through holes formed in the wall of the cylindrical body 15, so that one end of the ring-side power supply lines 5A and 5B is positioned on the outside of the cylindrical body 15 and the other end of the ring-side power supply lines 5A and 5B is positioned on the inside of the cylindrical body 15.

[0029] The ring-side power supply lines 5A and 5B may be embedded within the wall of the cylindrical body 15 so as to extend spirally in the direction of extension of the cylindrical body 15. In this case, one end of the ring-side power supply lines 5A and 5B extends outward from the cylindrical body 15 in order to connect one end of the ring-side power supply lines 5A and 5B to a DC power source.

[0030] Furthermore, spiral-shaped insulated wires can be used as the ring-side power supply wires 5A and 5B. Also, it is not a mandatory condition that the ring-side power supply wires 5A and 5B be attached to the surface (outer or inner surface) of the cylindrical body 15, or embedded in the wall of the cylindrical body 15; the ring-side power supply wires 5A and 5B may be located away from the cylindrical body 15.

[0031] The shaft 6 is made of an insulating material such as resin and is sequentially inserted into the interior of the cylindrical body 3 and the interior of the port site 2 (the interior of the port site 2 corresponds to the through hole 12).

[0032] The shaft 6 has a cavity 30 (Figures 3 to 5) that extends in the longitudinal direction (left-right direction in Figure 2). A gripping portion 31 (Figure 2) for the operator to grasp is provided at the base end of the shaft 6 so as to protrude radially outward. The gripping portion 31 has a hollow structure, and the cavity 30 extends from the internal space of the gripping portion 31 to the tip of the shaft 6. The power receiving unit 7 is provided in the internal space of the gripping portion 31 and outputs microwaves when DC power is supplied from the power source. The power receiving unit 7 comprises a microwave oscillator 32 and a microwave amplifier 33. The first coaxial cable 10 is arranged in the internal space of the gripping portion 31 and connects the microwave oscillator 32 and the microwave amplifier 33. The microwave oscillator 32 uses the DC power supplied from the power source to the power receiving unit 7 as a DC power source to oscillate microwaves. The microwave amplifier 33 uses the DC power supplied from the power supply to the power receiving unit 7 as a DC power supply to amplify the microwaves supplied from the microwave oscillator 32 via the first coaxial cable 10.

[0033] The second coaxial cable 11 passes through the cavity 30 of the shaft 6 and extends from the microwave amplifier 33 to the tip of the shaft 6.

[0034] In the illustrated example, a pair of blades 34, 34 are provided at the tip (working section) of the shaft 6, and the microwave amplifier 33 and the blades 34, 34 are connected by a second coaxial cable 11. The blades 34, 34 are such that the central conductor and the outer conductor ends are exposed, and an insulator is located between the central conductor and the outer conductor ends, as is the case with the tapered coaxial body disclosed in Japanese Patent Application Publication No. 2018-11994, and it is possible to supply microwaves to the central conductor via the second coaxial cable 11.

[0035] A wire or shaft (not shown) is connected to the blades 34, 34, and the blades 34, 34 can be opened and closed by pushing or pulling the wire or shaft. For example, the wire or shaft is made to pass through the cavity 30 of the shaft 6, and by operating a trigger 35 connected to the base end of the shaft 6, the wire or shaft can be pushed or pulled to open and close the blades 34, 34. Alternatively, a drive mechanism that rotates the wire or shaft around its axis may be provided on the shaft 6, and the blades 34, 34 can be rotated by rotating the wire or shaft with this drive mechanism. The drive mechanism may be provided, for example, on the gripping part 31.

[0036] A pair of shaft-side terminals 8A and 8B are made of metal and are provided on the outer surface of the shaft 6. The shaft-side terminals 8A and 8B are positioned opposite each other in the radial direction F (Figure 6(B)) of the shaft 6, and the width Ha (Figure 6(B)) of the shaft-side terminals 8A and 8B in the circumferential direction of the shaft 6 is shorter than the width Hb (Figure 6(A)) of the gap S in the circumferential direction of the power supply ring 14. Note that the above-mentioned positioning of the shaft-side terminals 8A and 8B opposite each other in the radial direction F means that the width centers of terminal 8C and terminal 8D lie on the same straight line extending in the radial direction F.

[0037] The shaft-side terminals 8A and 8B are each supported by a spring 40 and positioned in a recess 41 formed on the outer surface of the shaft 6. The spring 40 is a leaf spring or a log spring and is attached to the outer surface of the shaft 6 (for example, the surface of the recess 41).

[0038] The shaft-side power supply lines 9A and 9B are DC power supply lines. Shaft-side power supply line 9A connects the shaft-side terminal 8A to the power receiving unit 7, and shaft-side power supply line 9B connects the shaft-side terminal 8B to the power receiving unit 7. The shaft-side power supply lines 9A and 9B are embedded, for example, in the wall of the shaft 6. In this case, one end of the shaft-side power supply lines 9A and 9B extends into the internal space of the gripping unit 31 and is connected to the power receiving unit 7. The other ends of the shaft-side power supply lines 9A and 9B extend into the recess 41 and are connected to the shaft-side terminals 8A and 8B.

[0039] While the shaft 6 is not inserted into the cylindrical body 3, the compression lengths of the springs 40, 40 supporting the terminals 8A, 8B are small, so the distances La, Lb (Figure 6(B)) from the center of the shaft 6 to the outer edges of the shaft-side terminals 8A, 8B are each larger than the inner diameter R (Figure 6(A)) of the through hole 12 of the port site 2.

[0040] Then, by the user pressing the shaft-side terminals 8A and 8B with their fingers, the spring 40 supporting the terminals 8A and 8B is compressed, making the distance La and Lb less than or equal to the inner diameter R of the through hole. This allows the shaft 6 to be sequentially inserted into the inside of the cylindrical body 3 and the port site 2, and the shaft-side terminals 8A and 8B to be placed inside the power supply ring 14. In this state, as shown in Figure 5, one terminal 8 is fitted into the groove 21 of the ring-side terminal 4A, bringing one terminal 8 into contact with the ring-side terminal 4A, and the other terminal 8 is fitted into the groove 21 of the ring-side terminal 4B, bringing the other terminal 8 into contact with the ring-side terminal 4B. This connects the power supply path on the power source side (the power supply path consisting of power supply lines 5A and 5B and terminals 4A and 4B) and the power supply path on the power receiving unit 7 side (the power supply path consisting of terminals 8A and 8B and power supply lines 9A and 9B). This allows DC power from the DC power supply to be supplied to the power receiving unit 7, enabling microwaves to be emitted from the tip of the shaft 6 (blade 34, 34). Furthermore, the reaction force of the spring 40 resisting compression maintains contact between the ring-side terminals 4A, 4B and the shaft-side terminals 8A, 8B, thus allowing for a continuous supply of power to the power receiving unit 7.

[0041] For example, as shown in Figures 4 and 5, when terminal 8A is fitted into the groove 21 of terminal 4A and terminals 8A and 4A are in contact, and terminal 8B is fitted into the groove 21 of terminal 4B and terminals 8B and 4B are in contact, the DC power described above will flow in the following order, for example: positive terminal of DC power supply → power supply line 5A → terminal 4A → terminal 8A → power supply line 9A → power receiving unit 7 → power supply line 9B → terminal 8B → terminal 4B → power supply line 5B → negative terminal of DC power supply.

[0042] As described above, from the state in which terminal 8A is in contact with terminal 4A and terminal 8B is in contact with terminal 4B (the state in Figures 4 and 5), by rotating the shaft 6 around its axis, the opposite can be achieved: terminal 8A can be fitted into the groove 21 of terminal 4B, bringing terminal 8A and terminal 4B into contact, and terminal 8B can be fitted into the groove 21 of terminal 4A, bringing terminal 8B and terminal 4A into contact. In this case, the DC power will flow in the following order, for example: positive terminal of DC power supply → power supply line 5A → terminal 4A → terminal 8B → power supply line 9B → power receiving unit 7 → power supply line 9A → terminal 8A → terminal 4B → power supply line 5B → negative terminal of DC power supply.

[0043] In the following, the statement "of the shaft-side terminals 8A and 8B, one terminal 8 contacts the ring-side terminal 4A, and the other terminal 8 contacts the ring-side terminal 4B" will be appropriately abbreviated as "the ring-side terminals 4A and 4B and the shaft-side terminals 8A and 8B are in contact."

[0044] When the ring-side terminals 4A, 4B and the shaft-side terminals 8A, 8B are in contact (the power supply path on the power source side and the power supply path on the power receiving unit 7 side are connected), DC power is supplied to the microwave oscillator 32 and microwave amplifier 33 of the power receiving unit 7, causing the microwave oscillator 32 to oscillate microwaves. These microwaves are then supplied to the microwave amplifier 33 via the first coaxial cable 10 for amplification, and the amplified microwaves are supplied to the central conductor of the tip (blade 34, 34) of the shaft 6 via the second coaxial cable 11, allowing them to 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.

[0045] Furthermore, in the power supply 1 of this embodiment, the cylindrical body 15 is formed from an expandable and contractible insulating material. When the shaft-side terminals 8A and 8B are fitted into the grooves 21 of the ring-side terminals 4A and 4B, and the ring-side terminals 4A and 4B are in contact with the shaft-side terminals 8A and 8B, the cylindrical body 15 expands and contracts as the shaft 6 moves in the longitudinal direction (Figure 7). For example, when the shaft 6 is moved to one side in the longitudinal direction (left side in Figure 7) so that the length of the shaft 6 extending from the tip of the port site 2 is increased, the cylindrical body 15 is gradually compressed as the shaft 6 moves (Figure 7(B)). Also, for example, when the shaft 6 is moved to the other side in the longitudinal direction (right side in Figure 7) so that the length of the shaft 6 extending from the tip of the port site 2 is shortened, the cylindrical body 15 is gradually extended as the shaft 6 moves (Figure 7(A)).

[0046] When the power supply 1 of this embodiment is used in surgery, first, a port site 2 is created in the body wall of subject H (Figure 1). At this time, the orientation of the port site 2 is adjusted so that one end of the port site 2 and the cylindrical body 3 are located outside the body, and the other end of the port site 2 is inside the body. As shown in the illustrated example, if the port site 2 has a large diameter portion 2a at one end and a small diameter portion 2b at the other end, for example, the small diameter portion 2b is inserted into the body until the large diameter portion 2a contacts the surface of the body wall.

[0047] Next, the ring-side power supply lines 5A and 5B are fixed to the surface of the body wall of subject H.

[0048] Next, the surgical assistant hands the shaft 6 to the surgeon, inserts the shaft 6 through the through-hole 12 from one end of the port site 2, extends the tip of the shaft 6 into the body from the other end of the port site 2, and positions the blades 34, 34 (the tips of the shaft 6) at the surgical site inside the body. At this time, the trigger 35 is operated to open and close the blades 34, 34, and the area to be coagulated and cut is gripped by the blades 34, 34, and coagulation (hemostasis) and cutting operations are performed. Also, at the above time, since there is no power supply line connected to the shaft 6, the surgical assistant can easily hand the shaft 6 to the surgeon, and the surgeon can easily operate the shaft 6.

[0049] Then, with the blades 34, 34 positioned at the surgical site inside the body as described above, and the ring-side terminals 4A, 4B and the shaft-side terminals 8A, 8B in contact, the device can be operated at the surgical site by turning on the switch connected to the power supply. In other words, by turning on the switch, DC power is supplied to the power receiving unit 7, causing microwaves to be emitted from the microwave oscillator 32. These microwaves are then supplied to the microwave amplifier 33 for amplification, and the amplified microwaves are supplied to the central conductors of the blades 34, 34 and emitted to the coagulation and cutting site. This cauterizes the surgical site and stops bleeding. The microwaves emitted from the central conductors to the surgical site then flow to the outer conductors of the nearby blades 34, 34. Furthermore, with the above switch turned ON, if the shaft 6 is inserted through the through-hole 12 of the port site 2 and the ring-side terminals 4A, 4B and the shaft-side terminals 8A, 8B are brought into contact, DC power will be supplied to the power receiving unit 7 from the moment terminals 4, 8 make contact, and microwaves will be emitted from the blades 34, 34 (the tips of the shaft 6).

[0050] As described above, the power supply unit 1 of this embodiment allows power to be supplied to the power receiving unit 7 by a simple mechanism in which the power supply path on the power source side (power supply lines 5A, 5B and terminals 4A, 4B) and the power supply path on the power receiving unit 7 side (terminals 8A, 8B and power supply lines 9A, 9B) are connected by contact between the ring-side terminals 4A, 4B and the shaft-side terminals 8A, 8B. Therefore, the power supply unit 1 of this embodiment allows power to be supplied to the power receiving unit 7 at a low cost.

[0051] Furthermore, according to the power supply 1 of this embodiment, as shown in Figure 1, if the cylindrical body 3 is positioned outside the body and the ring-side terminals 4A, 4B and the shaft-side terminals 8A, 8B are brought into contact, the current will be supplied outside the body due to the contact of terminals 4, 8, thus reducing the risk of electric shock to subject H.

[0052] Furthermore, according to the power supply 1 of this embodiment, while the ring-side terminals 4A and 4B and the shaft-side terminals 8A and 8B are in contact and power is supplied from the power source to the power receiving unit 7, the shaft-side terminals 8A and 8B are positioned inside the power supply ring 14 (Figures 2(B), 4, and 5). This prevents electric shock to practitioners or others by contact with the shaft-side terminals 8A and 8B.

[0053] Furthermore, when the ring-side terminals 4A and 4B and the shaft-side terminals 8A and 8B are in contact, the cylindrical body 15 expands and contracts as the shaft 6 is moved in the longitudinal direction, thus preventing the cylindrical body 15 from obstructing the movement of the shaft 6.

[0054] Furthermore, according to the power supply 1 of this embodiment, since the power supply is connected to the ring-side terminals 4A and 4B using power supply lines 5A and 5B instead of using a rigid coaxial cable, the load applied to the shaft 6 when operating the shaft 6 while it is inserted into the port site 2 can be kept to a minimum. Therefore, the shaft 6 can be easily operated. For example, when tilting the shaft 6 to change the angle of the power supply 1, the small load applied to the shaft 6 makes it easy to tilt the shaft 6 (i.e., the angle of the power supply 1 can be easily changed).

[0055] Furthermore, according to the power supply unit 1 of this embodiment, the ring-side terminals 4A and 4B are aligned with the radial direction E (Figure 6(A)) of the power supply ring 14, and the shaft-side terminals 8A and 8B are aligned with the radial direction F (Figure 6(B)) of the shaft 6. The width Ha (Figure 6(B)) of the shaft-side terminals 8A and 8B is smaller than the width Hb (Figure 6(A)) of the gap S. Therefore, even if the shaft 6 rotates unintentionally during surgery, a situation will not occur where one terminal 8 (terminal 8A or terminal 8B) comes into contact with both of the ring-side terminals 4A and 4B, thus preventing a short circuit between the terminals.

[0056] Furthermore, according to the power supply 1 of this embodiment, microwaves are emitted from the tip of the shaft 6 (blade 34, 34), which excites water molecules in the biological tissue of subject H, thereby heating the biological tissue itself. As a result, the extent of damage to the surrounding area can be minimized without burning the biological tissue.

[0057] Furthermore, by making the cylindrical body 3 attachable to one end of the existing port site 2, there is no need to modify the port site 2, and the existing port site 2 can be made more effective.

[0058] The present invention is not limited to the embodiments shown above and can be modified in various ways. Modifications of the present invention will be described below. In the following description, the differences from the above embodiments will be the main focus, and components common to both embodiments will be indicated by the same reference numerals in the figures, and their descriptions will be omitted.

[0059] For example, the power supply of the present invention can be modified as shown in Figures 8 and 9. The power supply 50 shown in Figures 8 and 9 includes a cylindrical body 51 instead of the cylindrical body 3 shown in the above embodiment. The cylindrical body 51 includes a connecting ring 13, a power supply ring 14, and a cylindrical body 52 that connects the connecting ring 13 and the power supply ring 14. The cylindrical body 52 is made of an expandable and expandable insulating material and has a shape that decreases in diameter towards the power supply ring 14 side. In the above modified example as well, since the cylindrical body 52 is made of an expandable and expandable material, the shaft 6 can be moved smoothly in the longitudinal direction while the ring-side terminals 4A, 4B and the shaft-side terminals 8A, 8B are in contact (the expansion and contraction of the cylindrical body 52 prevents the cylindrical body 52 from hindering the movement of the shaft 6). In the above modified example, the ring-side power supply lines 5A and 5B are attached to the surface (outer or inner surface) of the cylindrical body 52 so as to extend spirally in the direction of extension of the cylindrical body 52. ​​Alternatively, the ring-side power supply lines 5A and 5B are embedded within the wall of the cylindrical body 52 so as to extend spirally in the direction of extension of the cylindrical body 52.

[0060] Furthermore, spiral-shaped insulated wires can be used as the ring-side power supply wires 5A and 5B. Also, it is not a mandatory requirement to attach the ring-side power supply wires 5A and 5B to the surface (outer or inner surface) of the cylindrical body 52, or to embed them within the walls of the cylindrical body 52; the ring-side power supply wires 5A and 5B may be located away from the cylindrical body 52.

[0061] Even when the cylindrical body 51 described above is used, the connecting ring 13 can be connected to one end of the port site 2 in the same manner as in the embodiment described above.

[0062] Furthermore, the cylindrical bodies 3 and 51 may be connected to one end of the port site such that the connecting ring 13 can rotate relative to the port site. In this case, when one terminal 8 is in contact with terminal 4A and the other terminal 8 is in contact with terminal 4B (as shown in Figure 5), the cylindrical bodies 3 and 51 will also rotate when the shaft 6 is rotated due to friction between the terminals.

[0063] Furthermore, the power supply of the present invention can be modified as shown in Figures 10 and 11. The power supply 60 shown in Figures 10 and 11 includes a winding ring 61 in addition to the port site 2, a pair of ring-side terminals 4A, 4B, ring-side power supply lines 5A, 5B, shaft 6, power receiving section 7, a pair of shaft-side terminals 8A, 8B, shaft-side power supply lines 9A, 9B, first coaxial cable 10, and second coaxial cable 11 shown in the above embodiment (i.e., the power supply 60 includes a winding ring 61 instead of the cylindrical body 3 shown in the embodiment). The winding ring 61 is connected to one end of the port site 2 and can be used to wind the ring-side power supply lines 5A, 5B around it. The shaft 6 is sequentially inserted into the inside of the power supply ring 14, the winding ring 61, and the inside of the port site 2.

[0064] In the illustrated example, one end of the winding ring 61 (the side with the power supply ring 14) is used to wind the ring-side power supply lines 5A and 5B around it, and with one end of the port site 2 (the large diameter portion 2a) inserted inside the other end of the winding ring 61 (the side with the port site 2), the other end of the winding ring 61 (the side with the port site 2) is connected to one end of the port site 2. This connection is achieved, for example, by providing a pin 20 (Figure 10(B)) that penetrates the wall of the winding ring 61 in the radial direction of the winding ring 61, and pressing the tip of the pin 20 against one end of the port site 2 with one end of the port site 2 (the large diameter portion 2a) inserted inside the winding ring 61. In this case, the winding ring 61 is provided with the pin 20 and an elastic means (not shown) that biases the pin 20 radially inward of the winding ring 61, and the biasing force of the elastic means presses the tip of the pin 20 against one end of the port site 2. Furthermore, by pulling the pin 20 radially outward of the winding ring 61 against the biasing force of the elastic means, the pressure of the tip of the pin 20 against one end of the port site 2 is released, and the winding ring 61 can be removed from one end of the port site 2. Furthermore, the above-mentioned "connecting the wrapping ring 61 to one end of the port site 2" can also be achieved by matching the inner diameter of the other end of the wrapping ring 61 with the outer diameter of one end of the port site 2, and inserting one end of the port site 2 (large diameter portion 2a) into the inside of the other end of the wrapping ring 61 (in this case, the wrapping ring 61 is connected to one end of the port site 2 by the frictional force generated between the inner surface of the other end of the wrapping ring 61 and the outer surface of one end of the port site 2). Alternatively, the wrapping ring 61 may be attached to one end of the port site 2 using an adhesive, thereby connecting the wrapping ring 61 to one end of the port site 2.

[0065] According to the above modification, by winding the ring-side power supply wires 5A and 5B around the winding ring 61, it is possible to prevent slack from occurring in the area of ​​the ring-side power supply wires 5A and 5B between the power supply ring 14 and the port site 2. Therefore, it is possible to prevent the area of ​​the ring-side power supply wires 5A and 5B from interfering with the work.

[0066] Furthermore, in order to reduce the effort required to wind the ring-side power supply wires 5A and 5B, an elastic means for pulling the ring-side power supply wires 5A and 5B toward the winding ring 61 may be provided on the winding ring 61. In this case, the winding ring 61 is provided so that, as the power supply ring 14 and the port site 2 approach each other due to the movement of the shaft 6, the ring-side power supply wires 5A and 5B can be wound around the winding ring 61 by the pulling force of the elastic means. In this case, it is preferable that the winding ring 61 is provided so that, as the shaft 6 moves so that the power supply ring 14 and the port site 2 move apart against the pulling force of the elastic means, the ring-side power supply wires 5A and 5B that were wound around the winding ring 61 can be unwound.

[0067] Although not shown in the diagram, the power supply device of the present invention comprises a port site 2, a power supply ring 14, ring-side terminals 4A, 4B, ring-side power supply lines 5A, 5B, a shaft 6, a power receiving section 7, shaft-side terminals 8A, 8B, and shaft-side power supply lines 9A, 9B. A coil formed by winding a portion of the ring-side power supply lines 5A, 5B into a coil shape may be connected to one end of the port site 2. In this case, the shape memory property of the ring-side power supply lines 5A, 5B maintains the state in which a portion of the ring-side power supply lines 5A, 5B are wound into a coil shape. As the shaft 6 is sequentially inserted into the power supply ring 14, the coil, and the port site 2, it becomes possible to bring the ring-side terminals 4A and 4B and the shaft-side terminals 8A and 8B into contact. When the ring-side terminals 4A and 4B and the shaft-side terminals 8A and 8B are in contact, the ring-side power supply lines 5A and 5B, the ring-side terminals 4A and 4B, the shaft-side terminals 8A and 8B, and the shaft-side power supply lines 9A, 9BPower from the power source is supplied to the power receiving unit 7 via this. Furthermore, in the above-mentioned power supply, it is preferable that the coil is expandable and contractible, and when the ring-side terminals 4A, 4B and the shaft-side terminals 8A, 8B are in contact, the coil expands and contracts as the power supply ring 14 and the port site 2 move.

[0068] Furthermore, although the above example shows the shaft-side terminals 8A and 8B being placed in the recess 41 of the shaft 6, in the power supply described above, the shaft-side terminals 8A and 8B may be fixed to the outer surface of the shaft 6 using screws or adhesive, or the shaft-side terminals 8A and 8B may be formed by applying metal powder to the outer surface of the shaft 6.

[0069] Furthermore, the power supply of the present invention can be modified as shown in Figure 12 (Figure 13 shows the shaft of the power supply 70 shown in Figure 12). The power supply 70 shown in Figure 12 differs from the power supply shown in the above embodiment in that the shaft 71, which is sequentially inserted into the inside of the cylindrical body 3 and the inside of the port site 2, comprises a shaft body 72 and a cylindrical sheet 73 that covers the outside of the shaft body 72, the power receiving unit 7, the first coaxial cable 10, the second coaxial cable 11, the first connector 74, and the first shaft-side power supply lines 9C, 9D are provided on the shaft body 72, and a pair of shaft-side terminals 8A, 8B, the second connector 75, and the second shaft-side power supply lines 9E, 9F are provided on the cylindrical sheet 73.

[0070] The shaft body 72 and the cylindrical sheet 73 are each formed from an insulating material such as resin. The shaft body 72 has the same shape as the shaft 6 shown in the above embodiment and has a cavity extending in the longitudinal direction (left-right direction in Figures 12 and 13). A gripping portion 31 for the practitioner to grasp is provided at the base end of the shaft body 72 so as to protrude radially outward. The gripping portion 31 has a hollow structure, and the cavity of the shaft body 72 extends from the internal space of the gripping portion 31 to the tip of the shaft body 72. The power receiving unit 7, as in the above embodiment, includes a microwave oscillator 32 and a microwave amplifier 33 and is provided in the internal space of the gripping portion 31. The first coaxial cable 10 is arranged in the internal space of the gripping portion 31 and connects the microwave oscillator 32 and the microwave amplifier 33. The microwave oscillator 32 uses the DC power supplied from the power supply to the power receiving unit 7 as a DC power source to generate microwaves. The microwave amplifier 33 uses the DC power supplied from the power supply to the power receiving unit 7 as a DC power source to amplify the microwaves supplied from the microwave oscillator 32 via the first coaxial cable 10. 。

[0071] The second coaxial cable 11 passes through the cavity of the shaft body 72 and extends from the microwave amplifier 33 to the tip of the shaft body 72. In the illustrated example, a pair of blades 34, 34 are provided at the tip (working part) of the shaft body 72, and the microwave amplifier 33 and the blades 34, 34 are connected by the second coaxial cable 11.

[0072] A pair of shaft-side terminals 8A and 8B are provided on the outer surface of the cylindrical sheet 73 so as to face each other in the radial direction of the cylindrical sheet 73 (corresponding to the vertical direction in the illustrated example, Figures 12 and 13). In the illustrated example, the shaft-side terminals 8A and 8B are each supported by a spring 76 and are positioned in recesses 77 formed on the outer surface of the cylindrical sheet 73. The spring 76 is a leaf spring or a log spring and is attached to the outer surface of the cylindrical sheet 73 (for example, the surface of the recess).

[0073] The first shaft-side power supply lines 9C, 9D and the second shaft-side power supply lines 9E, 9F are DC power supply lines. The first shaft-side power supply lines 9C, 9D connect the power receiving unit 7 and the first connector 74. The first shaft-side power supply lines 9C, 9D are embedded, for example, in the wall of the shaft body 72. In this case, the first shaft-side power supply lines 9C, 9D Each end extends into the internal space of the gripping section 31 and is connected to the power receiving section 7. The first connector 74 is attached to the outer surface of the shaft body 72 and connects to the first shaft-side power supply line. 9C, 9D The other end of the second shaft-side power supply line 9E connects the shaft-side terminal 8A to the second connector 75, and the second shaft-side power supply line 9F connects the shaft-side terminal 8B to the second connector 75. The second shaft-side power supply lines 9E and 9F are embedded, for example, in the wall of the cylindrical sheet 73. In this case, one end of the second shaft-side power supply lines 9E and 9F extends out into the recess 77. The other ends of the second shaft-side power supply lines 9E and 9F extend out to the outside of the cylindrical sheet 73 and are connected to the second connector 75.

[0074] The power supply unit 70 shown in Figure 12 can connect the shaft-side terminals 8A, 8B to the power receiving unit 7 via the first shaft-side power supply lines 9C, 9D and the second shaft-side power supply lines 9E, 9F by connecting the first connector 74 and the second connector 75. Connecting the first connector 74 and the second connector 75 is achieved, for example, by inserting the plug 74a of the first connector 74 into the socket of the second connector 75.

[0075] Furthermore, in the power supply unit 70 shown in Figure 12, while the shaft 71 is not inserted into the cylindrical body 3, the compression length of the springs 76, 76 supporting the terminals 8A, 8B is small, so the distance from the center of the shaft 71 to the outer edge of the shaft-side terminals 8A, 8B is larger than the inner diameter of the through hole 12 (Figure 12(B)) of the port site 2. Then, by pressing the shaft-side terminals 8A, 8B with a finger, the springs 76 supporting the terminals 8A, 8B are compressed, making the above distance less than or equal to the inner diameter of the through hole 12. This allows the shaft 71 to be sequentially inserted into the power supply ring 14 (more specifically, the inside of the cylindrical body 3) and the inside of the port site 2, thereby placing the shaft-side terminals 8A, 8B inside the power supply ring 14.

[0076] With the first connector 74 and the second connector 75 connected, as the shaft 71 is inserted into the inside of the power supply ring 14 (more specifically, the inside of the cylindrical body 3) and the inside of the port site 2, the shaft-side terminals 8A and 8B are placed inside the power supply ring 14, one terminal 8 is brought into contact with the ring-side terminal 4A, and the other terminal 8 is brought into contact with the ring-side terminal 4B. This allows power from the DC power supply to be supplied to the power receiving unit via the ring-side power supply lines 5A and 5B, the ring-side terminals 4A and 4B, the shaft-side terminals 8A and 8B, the second shaft-side power supply lines 9E and 9F, and the first shaft-side power supply lines 9C and 9D, enabling microwaves to be emitted from the tip (blade 34, 34) of the shaft body 72. Furthermore, the reaction force of the spring 76 resisting compression maintains the contact between the ring-side terminals 4A and 4B and the shaft-side terminals 8A and 8B, thus allowing power to be continuously supplied to the power receiving unit 7.

[0077] In the power supply 70 shown in Figure 12, instead of placing the shaft-side terminals 8A and 8B in the recesses 77 of the cylindrical sheet 73, the shaft-side terminals 8A and 8B may be fixed to the outer surface of the cylindrical sheet 73 using screws or adhesive, or the shaft-side terminals 8A and 8B may be formed by applying metal powder to the outer surface of the cylindrical sheet 73.

[0078] Furthermore, in the power supply of the present invention described above, it is preferable that the power receiving unit 7 (microwave output unit) be capable of supplying microwave power of 20W to 100W to the tip of the shaft 6 or shaft body 72. In this way, the microwave power required for surgical procedures such as hemostasis can be supplied to the tip of the shaft 6, and the dimensions, volume, and weight of the power receiving unit 7 can be reduced to approximately 50mm x 100mm x 5mm, a single-digit cubic centimeter, and a single-digit g (for example, about 5g), respectively, making it easy to incorporate the power receiving unit 7 (microwave output unit) into the gripping portion 31 of the shaft 6.

[0079] Conventionally, when supplying microwaves directly from an external source, it is necessary to use a thick, rigid coaxial cable with a diameter of about 10 mm. With the power supply described above, by supplying DC power to the power receiving unit 7, it is easy to achieve a power conversion efficiency of about 50% for the microwave amplifier 33. And when the efficiency of the microwave amplifier 33 is set to about 50% in this way, in order to supply microwave power of 20W to 100W to the tip of the shaft 6 or shaft body 72, the power supplied to the power receiving unit 7 should be 200W or less, so extremely thin power supply wires with a diameter of about 1 mm can be used as the ring-side power supply wires 5A, 5B and the shaft-side power supply wires 9A, 9B or 9C, 9D, 9E, 9F. And in this way, because the ring-side power supply wires 5A, 5B are extremely thin power supply wires, the operability of the shaft 6 or 71 when the shaft 6 or 71 is inserted into the port site 2 can be greatly improved.

[0080] Furthermore, in order to supply microwave power capable of performing surgery using the extremely thin power supply wires 5 and 9 as described above, the frequency of the microwaves emitted from the tip of the shaft 6 or shaft body 72 is preferably 300 MHz or more and 6 GHz or less, and more preferably 2.45 GHz ± 50 MHz. Also, the power conversion efficiency of the microwave amplifier (ratio of output microwave power to DC power used) is preferably 30% or more and 80% or less, and more preferably 50% or more. Furthermore, the microwave output supplied to the tip of the shaft 6 or shaft body 72 is preferably 20 W or more and 100 W or less, and more preferably 30 W or more and 60 W or less. Furthermore, the DC power supplied to the power receiving unit 7 is preferably 10 W or more and 150 W or less, and more preferably 50 W or more and 100 W or less.

[0081] Furthermore, for example, by using a gallium nitride transistor in the microwave amplifier 33, it is possible to achieve a power conversion efficiency of 50% or more. In particular, using a gallium nitride HEMT (high electron mobility transistor) can provide high power conversion efficiency. By using the above-mentioned microwave amplifier 33 with high power conversion efficiency, the amount of power that needs to be supplied from an external source can be kept to a minimum, so the power supply lines 5 and 9 can be made even thinner and lighter.

[0082] Furthermore, in the power supply described above, the power receiving section 7 may include a DC power supply section and a microwave output section. In this case, the DC power supply section comprises a microwave oscillator that oscillates microwaves and a microwave amplifier that amplifies microwaves, and DC power supplied from an external source is used as a DC power supply (operating source) to operate the microwave oscillator and microwave amplifier. In the above case, a voltage control section or the like that can control the voltage may be added to the microwave output section. In the above case, an impedance matching circuit and an output control circuit or the like may be added to the power receiving section 7.

[0083] Furthermore, although the above example shows the connection between the microwave oscillator 32 and the microwave amplifier 33 using a coaxial cable, the microwave oscillator 32 and the microwave amplifier 33 may be located in close proximity, or the microwave oscillator 32 and microwave amplifier 33 If the components are formed on the same circuit board, the microwave oscillator 32 and the microwave amplifier 33 may be connected by a microwave transmission line such as a microstrip line.

[0084] Furthermore, the power supply described above may include a power receiving unit 7 that outputs microwaves when AC power is supplied from an AC power source. The AC power referred to here means commercial frequency AC power supplied to household power distribution lines, etc. (In Japan, the frequency is 50Hz or 60Hz and the voltage is approximately 100V).

[0085] In the above case, AC power is supplied to the power receiving unit 7 from an AC power source via AC power lines 5A, 5B on the ring side and 9A, 9B or 9C, 9D, 9E, 9F on the shaft side. The power receiving unit 7 is equipped with at least a converter, a microwave oscillator, and a microwave amplifier. The converter converts the AC power supplied to the power receiving unit 7 from the AC power source into DC power. The microwave oscillator uses the DC power converted by the converter as a DC power source (operating source) to oscillate microwaves. amplifier This device uses the DC power converted by the converter as a DC power source (operating source) to amplify microwaves.

[0086] As described above, when supplying AC power to the power receiving unit 7, it is easy to achieve a power conversion efficiency of approximately 90% for the AC-to-DC converter. Therefore, it is easy to supply 1.11 times the amount of AC power to the power receiving unit 7 compared to when supplying DC power. Furthermore, by setting the power conversion efficiency of the AC-to-DC converter to approximately 90% and supplying 1.11 times the amount of AC power to the power receiving unit 7, it is possible to achieve the same effect as when supplying DC power to the power receiving unit 7, under conditions where an extremely thin power supply line, almost the same as when supplying DC power, is used.

[0087] Furthermore, the power supply unit described above can be modified to include a power receiving unit 7 that can output high frequencies when DC power is supplied from a DC power source. In this case, the power supply units 1, 50, 60, and 70 will include a power receiving unit equipped with a high-frequency oscillator and a high-frequency amplifier, a third coaxial cable, and a fourth coaxial cable, instead of the power receiving unit 7, the first coaxial cable 10, and the second coaxial cable 11.

[0088] The power receiving unit, which includes a high-frequency oscillator and a high-frequency amplifier, is housed inside the gripping portion 31 located at the base end of the shaft 6 or the shaft body 72. The third and fourth coaxial cables are provided on the shaft 6 or the shaft body 72; the third coaxial cable connects the high-frequency oscillator and the high-frequency amplifier, and the fourth coaxial cable connects the high-frequency amplifier to the tip (blade 34, 34) of the shaft 6 or the shaft body 72.

[0089] The modified power supply unit, with the ring-side terminals 4A, 4B and shaft-side terminals 8A, 8B in contact, supplies DC power from a DC power supply to the power receiving unit via ring-side power lines 5A, 5B, ring-side terminals 4A, 4B, shaft-side terminals 8A, 8B, and shaft-side power lines 9A, 9B or 9C, 9D, 9E, 9F, causing the high-frequency oscillator to oscillate a high frequency. This high frequency is then supplied to a high-frequency amplifier via a third coaxial cable for amplification, and the amplified high frequency is supplied to the tip (blade 34, 34) of the shaft 6 or shaft body 72 via a fourth coaxial cable for ejection. According to the power supply unit 1 described above, the high frequency ejected from the tip (blade 34, 34) of the shaft 6 or shaft body 72 can cauterize the surgical site to perform hemostasis, cutting, etc. The frequency of the high frequency ejected from the tip of the shaft 6 is preferably 150KHz to 10MHz.

[0090] Furthermore, the power supply unit described above can be modified to include a power receiving unit capable of outputting high frequencies when AC power is supplied from an AC power source. In this case, the power receiving unit shall include at least a converter, a high-frequency oscillator, and a high-frequency amplifier. AC power supply lines are used as the ring-side power supply lines 5A, 5B and the shaft-side power supply lines 9A, 9B or 9C, 9D, 9E, 9F, with the ring-side power supply line 5A connecting the ring-side terminal 4A to the first pole of the AC power source, and the ring-side power supply line 5B connecting the ring-side terminal 4B to the second pole of the AC power source. When the ring-side terminals 4A, 4B and the shaft-side terminals 8A, 8B are in contact, AC power from the AC power source is supplied to the power receiving unit 7 via the ring-side power supply lines 5A, 5B, the ring-side terminals 4A, 4B, the shaft-side terminals 8A, 8B, and the shaft-side power supply lines 9A, 9B or 9C, 9D, 9E, 9F. The converter converts the AC power supplied to the power receiving unit 7 from the AC power source 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 high frequencies. The high-frequency amplifier uses the DC power converted by the converter as a DC power source (operating source) to amplify high frequencies.

[0091] Furthermore, the aforementioned power supply may be supplied with high-frequency signals generated by devices other than the power supply itself. In this case, the power supply has ring-side terminals 4A and 4B and shaft-side terminal child When 8A and 8B are in contact, power from the high-frequency power supply is supplied to the blades 34, 34 of the shaft 6 or shaft body 72 via the ring-side power supply lines 5A, 5B, ring-side terminals 4A, 4B, shaft-side terminals 8A, 8B, and shaft-side power supply lines 9A, 9B or 9C, 9D, 9E, 9F, and the contact portions of the blades 34, 34 are heated. In this case, it is not necessary to have a high-frequency power supply built into the power receiving unit.

[0092] Furthermore, the power supply unit described above can be modified to include a receiving unit capable of outputting ultrasound when DC power is supplied from a DC power source. In this case, the receiving unit is equipped with at least an ultrasonic oscillator. DC power lines are used as the ring-side power lines 5A, 5B and the shaft-side power lines 9A, 9B or 9C, 9D, 9E, 9F, with the ring-side power line 5A connecting the ring-side terminal 4A to the first pole of the DC power source, and the ring-side power line 5B connecting the ring-side terminal 4B to the second pole of the DC power source. When the ring-side terminals 4A, 4B and the shaft-side terminals 8A, 8B are in contact, DC power from the DC power source is supplied to the receiving unit 7 via the ring-side power lines 5A, 5B, the ring-side terminals 4A, 4B, the shaft-side terminals 8A, 8B, and the shaft-side power lines 9A, 9B or 9C, 9D, 9E, 9F. The ultrasonic oscillator uses DC power as a DC power source (operating source) to generate ultrasonic waves. In this case, the shaft 6 and blade 34 are equipped with an ultrasonic transmission mechanism.

[0093] Furthermore, the power supply unit described above can be modified to include a power receiving unit that can output ultrasonic waves when AC power is supplied from an AC power source. In this case, the power receiving unit shall include at least a converter and an ultrasonic oscillator. AC power supply lines are used as the ring-side power supply lines 5A, 5B and shaft-side power supply lines 9A, 9B or 9C, 9D, 9E, 9F, with the ring-side power supply line 5A connecting the ring-side terminal 4A to the first pole of the AC power source, and the ring-side power supply line 5B connecting the ring-side terminal 4B to the second pole of the AC power source. When the ring-side terminals 4A, 4B and the shaft-side terminals 8A, 8B are in contact, AC power from the AC power source is supplied to the power receiving unit 7 via the ring-side power supply lines 5A, 5B, the ring-side terminals 4A, 4B, the shaft-side terminals 8A, 8B, and the shaft-side power supply lines 9A, 9B or 9C, 9D, 9E, 9F. The converter converts the AC power supplied to the power receiving unit 7 from the AC power source into DC power. The ultrasonic oscillator uses the DC power converted by the converter as a DC power source (operating source) to emit ultrasonic waves. In this case, the shaft 6 and the blade 34 are equipped with an ultrasonic transmission mechanism.

[0094] Furthermore, the functions of the shaft 6 or 71 of the power supply device of the present invention are not limited to the functions described above, but can be various functions that can be performed by supplying power. Also, the applications of the power supply device of the present invention are not limited to hemostasis, but can be various applications depending on the functions of the shaft 6 or 71, etc. In the above example, an example was shown in which the power receiving unit 7 is provided at the base end of the shaft 6 or shaft body 72, but depending on the application of the power supply device 1, the power receiving unit 7 may be provided at the tip of the shaft 6 or shaft body 72, and power may be supplied to the power receiving unit 7. [Explanation of Symbols]

[0095] 1,50,60,70 Power feeder 2 Port Sites 3.51 Cylindrical body 4A, 4B Ring-side terminals 5A, 5B Ring-side power supply line 6.71 shaft 7 Power receiving section 8A, 8B Shaft-side terminals 9A, 9B, 9C, 9D, 9E, 9F Shaft-side power supply lines 13 Connecting rings 14 Power supply ring 15,52 Cylindrical body 61 Wrapping ring 72 Shaft body 73. Cylindrical sheet 74 First connector 75 Second connector

Claims

1. A port site formed from an insulating material and exhibiting a tubular shape, A power supply ring formed from an insulating material, The ring-side terminal is provided on the inner surface of the power supply ring, A ring-side power supply line connects the ring-side terminal to the power supply, A shaft is sequentially inserted into the inside of the power supply ring and the inside of the port site, The power receiving unit provided on the shaft, A shaft-side terminal provided on the outer surface of the shaft, The shaft is provided with a shaft-side power supply line that connects the power receiving unit and the shaft-side terminal, As the shaft is inserted into the inside of the power supply ring and the inside of the port site, it is possible to bring the ring-side terminal and the shaft-side terminal into contact. A power supply that, when the ring-side terminal and the shaft-side terminal are in contact, can supply power from the power source to the power receiving unit via the ring-side power supply line, the ring-side terminal, the shaft-side terminal, and the shaft-side power supply line.

2. The shaft comprises a shaft body on which the power receiving section is provided, and a cylindrical sheet covering the outside of the shaft body, and the shaft-side terminal is provided on the outer surface of the cylindrical sheet. The shaft body is provided with a first connector and a first shaft-side power supply line connecting the power receiving unit and the first connector, and the cylindrical sheet is provided with a second connector and a second shaft-side power supply line connecting the shaft-side terminal and the second connector, and by connecting the first connector and the second connector, it is possible to connect the power receiving unit and the shaft-side terminal via the first shaft-side power supply line, the first connector, the second connector, and the second shaft-side power supply line. The power supply according to claim 1, wherein, with the first connector and the second connector connected, the ring-side terminal and the shaft-side terminal are brought into contact as the shaft is inserted into the inside of the power supply ring and the inside of the port site, thereby enabling power from the power supply to be supplied to the power receiving unit via the ring-side power supply line, the ring-side terminal, the shaft-side terminal, the second shaft-side power supply line, and the first shaft-side power supply line.

3. The port site comprises a cylindrical body extending from one end, The cylindrical body is formed from an insulating material and comprises a connecting ring, a power supply ring, and a cylindrical body, wherein the connecting ring is attached to one end of the port site or molded integrally with one end of the port site, thereby connecting to one end of the port site, and the cylindrical body connects the connecting ring and the power supply ring. The cylindrical body is formed from an expandable and contractible insulating material. The shaft is sequentially inserted into the interior of the cylindrical body and the interior of the port site. As the shaft is inserted into the interior of the cylindrical body and the interior of the port site, the ring-side terminal and the shaft-side terminal can be fitted into the groove of one of the terminals, thereby bringing the ring-side terminal and the shaft-side terminal into contact. The power supply according to claim 1, wherein when the ring-side terminal and the shaft-side terminal are in contact, the cylindrical body expands and contracts as the shaft moves.

4. The power supply according to claim 3, wherein the cylindrical body has a shape that decreases in diameter towards the power supply ring side.

5. Equipped with a winding ring made of an insulating material, The aforementioned winding ring is connected to one end of the port site, and the ring-side power supply wire can be wound around it. The power supply according to claim 1, wherein the shaft is sequentially inserted into the inside of the power supply ring, the winding ring, and the port site.