The present invention relates to a plasma-generating device, comprising an anode, a cathode and at least one intermediate electrode, said intermediate electrode being arranged at least partly between said anode and said cathode, and said intermediate electrode and said anode forming at least a part of a plasma channel which has an opening in said anode. The invention also relates to a plasma surgical device and use of a plasma surgical device.
Plasma devices relate to the devices which are arranged to generate a gas plasma. Such gas plasma can be used, for instance, in surgery for the purpose of causing destruction (dissection) and/or coagulation of biological tissues.
As a rule, such plasma devices are formed with a long and narrow end or the like which can easily be applied to a desired area that is to be treated, such as bleeding tissue. At the tip of the device, a gas plasma is present, the high temperature of which allows treatment of the tissue adjacent to the tip.
WO 2004/030551 (Suslov) discloses a plasma surgical device according to prior art. This device comprises a plasma-generating system with an anode, a cathode and a gas supply channel for supplying gas to the plasma-generating system. Moreover the plasma-generating system comprises a plurality of electrodes which are arranged between said cathode and anode. A housing of an electrically conductive material which is connected to the anode encloses the plasma-generating system and forms the gas supply channel.
Owing to the recent developments in surgical technology, that referred to as laparoscopic (keyhole) surgery is being used more often. This implies, for example, a greater need for devices with small dimensions to allow accessibility without extensive surgery. Small instruments are also advantageous in surgical operations to achieve good accuracy.
It is also desirable to be able to improve the accuracy of the plasma jet in such a manner that, for example, smaller areas can be affected by heat. It is also desirable to be able to obtain a plasma-generating device which gives limited action of heat around the area which is to be treated.
Thus, there is a need for improved plasma devices, in particular plasma devices with small dimensions and great accuracy which can produce a high temperature plasma.
An object of the present invention is to provide an improved plasma-generating device according to the preamble to claim 1.
Additional objects of the present invention is to provide a plasma surgical device and use of such a plasma surgical device in the field of surgery.
According to one aspect of the invention, a plasma-generating device is provided, comprising an anode, a cathode and at least one intermediate electrode, said intermediate electrode being arranged at least partly between said anode and said cathode, and said intermediate electrode and said anode forming at least a part of a plasma channel which has an opening in said anode.
According to the invention, the plasma-generating device comprises at least one coolant channel which is arranged with at least one outlet opening which is positioned beyond, in the direction from the cathode to the anode, said at least one intermediate electrode, and the channel direction of said coolant channel at said outlet opening has a directional component which is the same as that of the channel direction of the plasma channel at the opening thereof.
This construction of the plasma-generating device allows that a coolant, which is adapted to flow in the coolant channel, is allowed to flow out at the end of the plasma-generating device in the vicinity of the opening of the plasma channel. An advantage achieved by this arrangement is that a coolant flowing out through an outlet of the coolant channel can be used to screen and restrict a plasma jet which is emitted through the plasma channel outlet which opens into the anode. Screening and restriction of the plasma jet allows, inter alia, advantages in treatment of above all small areas since the active propagations of the plasma-generating jet can be limited.
It is also possible to use the coolant flowing out to cool an object affected by the plasma jet. Cooling of the object that is to be treated can, for instance, be suitable to protect regions surrounding the area of treatment.
For instance, the plasma jet can be screened in its longitudinal direction so that there is substantially low heat on one side of the screen and substantially high heat on the other side of the screen. In this manner, a substantially distinct position of the plasma jet is obtained, in the flow direction of the plasma jet, where the object to be treated is affected, which can provide improved accuracy in operation of the plasma-generating device.
Similarly, the coolant flowing out can provide screening of the plasma jet in the radial direction relative to the flow direction of the plasma jet. Screening in the radial direction in this way allows that a relatively small surface can be affected by heat in treatment. Screening in the lateral direction, relative to the flow direction of the plasma, can also allow that areas around the treated region can at the same time be cooled by the coolant flowing out and thus be affected to a relatively small extent by the heat of the plasma jet.
Prior art plasma-generating devices usually have a closed coolant system for cooling the plasma-generating device in operation. Such a closed coolant system is often arranged by the coolant flowing in along one path in the plasma-generating device and returning along another path. This often causes relatively long flow paths. A drawback of long flow paths is that flow channels for the coolant must frequently be made relatively large to prevent extensive pressure drops. This means in turn that the flow channels occupy space that affects the outer dimensions of the plasma-generating device.
A further advantage of the invention is that pressure drops in the coolant channel can be reduced compared with, for instance, closed and circulating coolant systems. Consequently the cross-section of the coolant channel can be kept relatively small, which means that also the outer dimensions of the plasma-generating device can be reduced. Reduced dimensions of the plasma-generating device are often desirable in connection with, for instance, use in space-limited regions or in operation that requires great accuracy. Suitably the end of the plasma-generating device next to the anode (“the anode end of the device”) has an outer dimension which is less than 10 mm, preferably less than 5 mm. In an alternative embodiment, the outer dimension of the plasma-generating device is equal to or less than 3 mm. The anode end of the device preferably has a circular outer geometry.
Thus, the invention allows that the coolant which is adapted to flow through the coolant channel can be used to cool the plasma-generating device in operation, screen and limit the propagation of the plasma jet and cool regions surrounding the area affected by the plasma jet. However, it will be appreciated that, dependent on the application, it is possible to use individual fields of application or a plurality of these fields of application.
To allow the coolant in the coolant channel to flow out in the vicinity of the plasma jet, it is advantageous to arrange the outlet opening of the coolant channel beside and spaced from the opening of the plasma channel.
In one embodiment, the opening of the coolant channel is arranged in the anode. By arranging the outlet opening of the coolant channel and the opening of the plasma channel close to each other, the end of the plasma-generating device has in the vicinity of the anode a nozzle with at least two outlets for discharging coolant and plasma, respectively. It is suitable to let the coolant channel extend along the whole anode, or parts of the anode, to allow also cooling of the anode in operation. In one embodiment, the outlet of the coolant channel is arranged on the same level as, or in front of, in the direction from the cathode to the anode, the outlet of the plasma channel in the anode.
The main extent of the coolant channel is suitably substantially parallel to said plasma channel. By arranging the coolant channel parallel to the plasma channel, it is possible to provide, for instance, a compact and narrow plasma-generating device. The coolant channel suitably consists of a throughflow channel whose main extent is arranged in the longitudinal direction of the plasma channel. With such a design, the coolant can, for instance, be supplied at one end of the plasma-generating device so as to flow out at the opposite end next to the anode.
Depending on desirable properties of the plasma-generating device, an outlet portion of the coolant channel can be directed and angled in different suitable ways. In one embodiment of the plasma-generating device, the channel direction of the coolant channel at the outlet opening can extend, in the direction from the cathode to the anode, at an angle between +30 and −30 degrees in relation to the channel direction of said plasma channel at the opening thereof. By choosing different angles for different plasma-generating devices, the plasma jet can thus be screened and restricted in various ways both in its longitudinal direction and transversely to its longitudinal direction. The above stated suitable variations of the channel direction of the coolant channel in relation to the channel direction of the plasma channel are such that an angle of 0 degrees corresponds to the fact that the channel directions of both channels are parallel.
In the case that a restriction is desired in the lateral direction, radially transversely to the longitudinal direction of the plasma channel, of the plasma jet, the channel direction of the coolant channel at said outlet opening can extend, in the direction from the cathode to the anode, substantially parallel to the channel direction of said plasma channel at the opening thereof.
In another embodiment, a smaller radial restriction transversely to the longitudinal direction of the plasma channel can be desirable. For an alternative embodiment, for instance, the channel direction of the coolant channel at said outlet opening can extend, in the direction from the cathode to the anode, at an angle away from the channel direction of said plasma channel at the opening thereof.
In another alternative embodiment, the channel direction of the coolant channel at said outlet opening can extend, in the direction from the cathode to the anode, at an angle towards the channel direction of said plasma channel at the opening thereof. This embodiment allows, for instance, that the plasma jet can be restricted, by the coolant flowing out, both in the lateral direction of the flow direction of the plasma jet and in the longitudinal direction of the flow direction of the plasma jet.
It will be appreciated that an outlet portion of the coolant channel can be arranged in various ways depending on the properties and performance that are desired in the plasma-generating device. It will also be appreciated that the plasma-generating device can be provided with a plurality of such outlet portions. A plurality of such outlet portions can be directed and angled in a similar manner. However, it is also possible to arrange a plurality of different outlet portions with different directions and angles relative to the channel direction of the plasma channel at the opening thereof.
The plasma-generating device can also be provided with one or more coolant channels. Moreover each such coolant channel can be provided with one or more outlet portions.
In use, the coolant channel is preferably passed by a coolant which flows from the cathode to the anode. As coolant, use is preferably made of water, although other types of fluids are possible. Use of a suitable coolant allows that heat emitted from the plasma-generating device in operation can be absorbed and extracted.
To provide efficient cooling of the plasma-generating device, it may be advantageous that a part of said coolant channel extends along said at least one intermediate electrode. By the coolant in the coolant channel being allowed to flow in direct contact with the intermediate electrode, good heat transfer between the intermediate electrode and the coolant is thus achieved. For suitable cooling of large parts of the intermediate electrode, a part of said coolant channel can extend along the outer periphery of said at least one intermediate electrode. For example, the coolant channel surrounds the outer periphery of said at least one intermediate electrode.
In one embodiment, an end sleeve of the plasma-generating device, which end sleeve preferably is connected to the anode, constitutes part of a radially outwardly positioned boundary surface of the coolant channel. In another alternative embodiment, said at least one intermediate electrode constitutes part of a radially inwardly positioned boundary surface of the coolant channel. By using these parts of the structure of the plasma-generating device as a part of the boundary surfaces of the coolant channel, good heat transfer can be obtained between the coolant and adjoining parts that are heated in operation. Moreover the dimensions of the plasma-generating device can be reduced by the use of separate coolant channel portions being reduced.
It is advantageous to arrange the coolant channel so that, in use, it is passed by a coolant quantity of between 1 and 5 ml/s. Such flow rates are especially advantageous in surgical applications where higher flow rates can be detrimental to the patient.
To allow the coolant to be distributed around the plasma jet, it may be advantageous that at least one coolant channel is provided with at least two outlets, preferably at least four outlets. Moreover the plasma-generating device can suitably be provided with a plurality of coolant channels. The number of coolant channels and the number of outlets can be optionally varied, depending on the field of application and the desired properties of the plasma-generating device.
According to a second aspect of the invention, a plasma surgical device is provided, comprising a plasma-generating device as described above. Such a plasma surgical device of the type here described can suitably be used for destruction or coagulation of biological tissue. Moreover, such a plasma surgical device can advantageously be used in heart or brain surgery. Alternatively such a plasma surgical device can advantageously be used in liver, spleen, kidney surgery or in skin treatment in plastic and cosmetic surgery.
The invention will now be described in more detail with reference to the accompanying schematic drawings which by way of example illustrate currently preferred embodiments of the invention.
The plasma-generating device 1 according to
In the embodiment shown in
Moreover the end 15 of the cathode 5 which is directed to the anode 7 has a tapering end portion. This tapering portion 15 suitably forms a tip positioned at the end of the cathode as shown in
The other end of the cathode 5 which is directed away from the anode 7 is connected to an electrical conductor to be connected to an electric energy source. The conductor is suitably surrounded by an insulator. (The conductor is not shown in
Connected to the inlet end of the plasma channel 11, a plasma chamber 17 is arranged, which has a cross-sectional surface, transversely to the longitudinal direction of the plasma channel 11, which exceeds the cross-sectional surface of the plasma channel 11 at the inlet end thereof. The plasma chamber 17 which is shown in
Preferably the insulator element 19 is made of a temperature-resistant material, such as ceramic material, temperature-resistant plastic material or the like. The insulator element 19 intends to protect adjoining parts of the plasma-generating device from high temperatures which can occur, for instance, around the cathode 5, in particular around the tip 15 of the cathode.
The insulator element 19 and the cathode 5 are arranged relative to each other so that the end 15 of the cathode 5 which is directed to the anode projects beyond an end face 21, which is directed to the anode 7, of the insulator element 19. In the embodiment shown in
A gas supply part (not shown in
The plasma-generating device 1 further comprises one or more coolant channels 23 which open into the elongate end sleeve 3. The coolant channels 23 are suitably partly made in one piece with a housing (not shown) which is connected to the end sleeve 3. The end sleeve 3 and the housing can, for instance, be interconnected by a threaded joint, but also other connecting methods, such as welding, soldering etc, are conceivable. Moreover the end sleeve suitably has an outer dimension which is less than 10 mm, preferably less than 5 mm, in particular between 3 mm and 5 mm. At least a housing portion positioned next to the end sleeve suitably has an outer shape and dimension which substantially corresponds to the outer dimension of the end sleeve. In the embodiment of the plasma-generating device shown in
The coolant channels 23 suitably consist of through-flow channels which extend through the device and open into or in the vicinity of the anode 7. Moreover parts of such coolant channels 23 can be made, for instance, by extrusion of the housing or mechanical working of the housing. However, it will be appreciated that parts of the coolant channel 23 can also be formed by one or more parts which are separate from the housing and arranged inside the housing.
The plasma-generating device 1 can be provided with a coolant channel 23 which is provided with one or more outlet openings 25. Alternatively, the plasma-generating device 1 can be provided with a plurality of coolant channels 23, which each can be provided with one or more outlet openings 25. Each coolant channel 23 can also be divided into a plurality of channel portions which are combined in a common channel portion, which common channel portion can be provided with one or more outlet openings 25. It is also possible to use all or some of the channels 23 for other purposes. For example, three channels 23 can be arranged, two being used to be passed by coolant and one to suck liquids, or the like, from a surgical area etc.
In the embodiment shown in
Moreover the outlet openings 25 of the coolant channel 23 are arranged beyond, in the direction from the cathode 5 to the anode 7, the intermediate electrodes 9′, 9″, 9′″. In the embodiment shown in
Coolant channels 23 can partly be used to cool the plasma-generating device 1 in operation. As coolant, use is preferably made of water, although other types of fluids are conceivable. To provide cooling, a portion of the coolant channel 23 is arranged so that the coolant is supplied to the end sleeve 3 and flows between the intermediate electrodes 9′, 9″, 9′″ and the inner wall of the end sleeve 3. In operation of the device, it is preferred to let a flow amount of 1-5 ml/s flow through the plasma-generating device 1. The flow amount of coolant may, however, be optionally varied depending on factors such as operating temperature, desired operating properties, field of application etc. In surgical applications, the coolant flow rate is typically between 1 and 3 ml/s and the temperature of the coolant flowing out through the outlet opening 25 is typically between 25 and 40° C.
The coolant which is intended to flow through the coolant channels 25 can also be used to screen the plasma jet and restrict the range of the plasma jet which is emitted through the outlet of the plasma channel 11 in the anode 7. The coolant can also be used to cool areas adjacent to a region, affected by the plasma jet, of an object.
In the embodiment shown in
The directed outlet portions allow that the plasma jet generated in operation can be screened in its longitudinal direction by the coolant flowing through the outlet openings 25 of the coolant channel 23. As a result, an operator who operates the device can obtain an essentially distinct position where the plasma jet will be active. In front of this position, suitably little effect from the plasma jet occurs. Consequently this enables good accuracy, for instance, in surgery and other precision-requiring fields of application. At the same time the coolant discharged through the outlet opening 25 of a coolant channel 23 can provide a screening effect in the lateral direction radially outside the centre of the plasma jet. Owing to such screening, a limited surface can be affected by heat locally, and cooled areas of the treated object, outside the area affected by the heat of the plasma, are affected to a relatively small extent by the plasma jet.
In the embodiment shown in
It will be appreciated that the embodiments according to
It is also possible to vary the angle of the channel direction at the outlet portions 25; 125; 225 in relation to the longitudinal direction of the plasma channel 11; 111; 211. Preferably, the outlet portions are arranged at an angle α, β of ±30 degrees in relation to the longitudinal direction of the plasma channel 11; 111; 211. In the embodiment shown in FIG. 1a the outlet portions are arranged at an angle α of +10 degrees in relation to the longitudinal direction of the plasma channel 11; 111; 211. For the plasma-generating device shown in
In the embodiment shown in
It will be appreciated that the outlet openings 125 of the cooling channel 123 optionally can be designed with a number of alternative geometries and sizes. The cross-sectional surface of the outlet openings can typically be between 0.50 and 2.0 mm2, preferably 1 to 1.5 mm2.
It is obvious that these different designs of the outlet openings 25; 125; 225 can also be used for the embodiments of the plasma-generating device as shown in
The following description refers to
The intermediate electrodes 9′, 9″, 9′″ shown in
In the embodiment shown in
The intermediate electrode 9′″ which is positioned furthest away from the cathode 5 is in contact with an annular insulator means 13′″ which is arranged against the anode 7.
The anode 7 is connected to the elongate end sleeve 3. In the embodiment shown in
Suitable geometric relationships between parts included in the plasma-generating device 1, 101, 201 will be described below with reference to
The inner diameter di of the insulator element 19 is only slightly greater than the outer diameter dc of the cathode 5. In one embodiment, the difference in cross-section, in a common cross-section, between the cathode 5 and the inner diameter di of the insulator element 19 is suitably equal to or greater than a minimum cross-section of the plasma channel 11. Such a cross-section of the plasma channel 11 can be positioned anywhere along the extent of the plasma channel 11.
In the embodiment shown in
In one embodiment, the cathode 5 is arranged so that a partial length of the cathode tip 15 projects beyond a boundary surface 21 of the insulator element 19. The tip 15 of the cathode 5 is in
The total length Lc of the cathode tip 15 is suitably greater than 1.5 times the diameter dc of the cathode 5 at the base of the cathode tip 15. Preferably the total length Lc of the cathode tip 15 is about 1.5-3 times the diameter dc of the cathode 5 at the base of the cathode tip 15. In the embodiment shown in
In one embodiment, the diameter dc of the cathode 5 is about 0.3-0.6 mm at the base of the cathode tip 15. In the embodiment shown in
However, it will be appreciated that it is possible to vary this diameter dc along the extent of the cathode 5. In one embodiment, the plasma chamber 17 has a diameter Dc which corresponds to approximately 2-2.5 times the diameter dc of the cathode 5 at the base of the cathode tip 15. In the embodiment shown in
The extent Lch of the plasma chamber 17 in the longitudinal direction of the plasma-generating device 1 corresponds to approximately 2-2.5 times the diameter dc of the cathode 5 at the base of the cathode tip 15. In the embodiment shown in
In one embodiment the tip 15 of the cathode 5 extends over half the length Lch of the plasma chamber 17 or more than said length. In an alternative embodiment, the tip 15 of the cathode 5 extends over ½ to ⅔ of the length Lch of the plasma chamber 17. In the embodiment shown in
In the embodiment shown in
In the embodiment shown in
A transition portion 27 is arranged between the plasma chamber 17 and the plasma channel 11 and constitutes a tapering transition, in the direction from the cathode 5 to the anode 7, between the diameter Dch of the plasma chamber 17 and the diameter dch of the plasma channel 11. The transition portion 27 can be formed in a number of alternative ways. In the embodiment shown in
The plasma channel 11 is formed by the anode 7 and the intermediate electrodes 9′, 9″, 9′″ arranged between the cathode 5 and the anode 7. The length of the plasma channel 11 between the opening of the plasma channel closest to the cathode and up to the anode corresponds suitably to about 4-10 times the diameter dch of the plasma channel 11. In the embodiment shown in
That part of the plasma channel which extends through the anode is about 3-4 times the diameter dch of the plasma channel 11. For the embodiment shown in
The plasma-generating device 1 can advantageously be provided as a part of a disposable instrument. For example, a complete device with the plasma-generating device 1, outer shell, tubes, coupling terminals etc. can be sold as a disposable instrument. Alternatively, only the plasma-generating device 1 can be disposable and connected to multiple-use devices.
Other embodiments and variants are conceivable within the scope of the present invention. For example, the number and shape of the electrodes 9′, 9″, 9′″ can be varied according to which type of plasma-generating gas is used and which properties of the generated plasma are desired.
In use the plasma-generating gas, such as argon, which is supplied through the gas supply part, is introduced into the space between the cathode 5 and the insulator element 19 as described above. The supplied plasma-generating gas is passed on through the plasma chamber 17 and the plasma channel 11 to be discharged through the opening of the plasma channel 11 in the anode 7. Having established the gas supply, a voltage system is switched on, which initiates a discharge process in the plasma channel 11 and establishes an electric arc between the cathode 5 and the anode 7. Before establishing the electric arc, it is suitable to supply coolant to the plasma-generating device 1 through the coolant channel 23, as described above. Having established the electric arc, a gas plasma is generated in the plasma chamber 17, which during heating is passed on through the plasma channel 11 to the opening thereof in the anode 7.
A suitable operating current for the plasma-generating devices 1, 101, 201 according to
In the electric arc established between the cathode and anode, there prevails in the centre thereof, along the centre axis of the plasma channel, a temperature T which is proportional to the relationship between the discharge current I and the diameter dch of the plasma channel (T=k*i/dch). To provide, at a relatively low current level, a high temperature of the plasma, for instance 10,000 to 15,000° C., at the outlet of the plasma channel in the anode, the cross-section of the plasma channel and, thus, the cross-section of the electric arc which heats the gas should be small, for instance 0.2-0.5 mm. With a small cross-section of the electric arc, the electric field strength in the channel has a high value.
Number | Date | Country | Kind |
---|---|---|---|
0501603 | Jul 2005 | SE | national |
This application is a continuation of U.S. patent application Ser. No. 11/482,580, filed Jul. 7, 2006, entitled “PLASMA-GENERATING DEVICE, PLASMA SURGICAL DEVICE AND USE OF A PLASMA SURGICAL DEVICE,” which claims priority of a Swedish Patent Application No. 0501603-5 filed on Jul. 8, 2005.
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Number | Date | Country | |
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20180168022 A1 | Jun 2018 | US |
Number | Date | Country | |
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Parent | 11482580 | Jul 2006 | US |
Child | 15875291 | US |