The invention relates to a device (10) for generating a plasma jet (P) comprising a first conduit (11) inside a second conduit (12), a first electrode (17) and a second electrode (18) for generating an electric field in a feed gas flow (F) provided in a first flow channel (15) to generate a plasma jet (P), and adapted to provide a curtain gas flow (C) in the space between the first and second conduit (11,12), wherein the first electrode (17) is positioned radially outside of the first flow channel (15), and wherein the radial distance of the second electrode (18) from a longitudinal axis (l) is larger than the radial distance of the first electrode (17) from said longitudinal axis (l). The invention further relates to an endoscope comprising a device (10), a method for generating a plasma jet (P), a method and a use of the device (10) for manipulating a cavity.
Figure 1 of the Patent Specification
EP3506847 B1
1. Device (10) for generating a plasma jet (P), comprising a first conduit (11), which comprises a first outlet (13), and a second conduit (12), which comprises at
least one second outlet (14), wherein the first conduit (11) is arranged inside the second conduit (12), such that a first flow channel (15) is provided inside the
first conduit (11), and a second flow channel (16) is provided in the space between the first conduit (11) and the second conduit (12),
a first electrode (17) and a second electrode (18), wherein the first electrode (17) is positioned radially outside of the first flow channel (15),
wherein the radial distance of the second electrode (18) from a longitudinal axis (I) of the first conduit (11) is larger than the radial distance of the first electrode (17) from said longitudinal axis (I),
characterised in that
the first conduit (11) is connected to a feed gas reservoir in order to provide a plasma feed gas in the first flow channel, the first electrode (17) and
the second electrode (18) for generating an electric field in a feed gas flow (F) provided in the first flow channel (15) in order to generate a plasma jet (P) from the feed gas flow (F), wherein the second conduit (12) is connected to a curtain gas reservoir in order to provide a curtain gas flow (C) at the second outlet (14) surrounding the plasma jet (P) emerging from the first outlet (13), wherein said feed gas has an ignition voltage which is lower than the ignition voltage of the curtain gas.
EP3977952 B1
1. Device (10) for generating a plasma jet (P), comprising a first conduit (11), which comprises a first outlet (13), and a second conduit (12), which comprises at
least one second outlet (14), wherein the first conduit (11) is arranged inside the second conduit (12), such that a first flow channel (15) is provided inside the
first conduit (11), and a second flow channel (16) is provided in the space between the first conduit (11) and the second conduit (12), and wherein the device
(10) comprises a first electrode (17) and a second electrode (18) for generating an electric field in a feed gas flow (F) provided in the first flow channel (15) in order to generate a plasma jet (P) from the feed gas flow (F), wherein the device (10) is adapted to provide a curtain gas flow (C) at the second outlet (14) surrounding the plasma jet (P) emerging from the first outlet (13), wherein the first electrode (17) is positioned radially outside of the first flow channel (15), wherein the radial distance of the second electrode (18) from a longitudinal axis (I) of the first conduit (11) is larger than the radial distance of the first electrode (17) from said longitudinal axis (I), characterized in that at least a part of the second conduit (12) comprises a flexible section (19), wherein the
bending stiffness of the flexible section (19) is such that the flexible section (19) can be bent by a bending radius in the range of 10 mm to 100 mm.
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