Apparatus for coagulating tissue
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1. An apparatus for coagulating tissue, comprising:
- an electrode adapted to produce a high-frequency current;
a gas-delivering device having an outlet and being adapted to deliver an inert gas from said outlet into a space defined between said electrode and said tissue, such that a plasma is produced between said electrode and said tissue when said high-frequency current is applied to said inert gas, wherein a distal end of said electrode projects out of said outlet of said gas-delivering device; and
a guiding device comprised of an electrically insulating material and disposed at said distal end of said electrode, said guiding device for directing and guiding said plasma such that at least a part of said plasma is diverted in a predetermined direction,wherein a cross-section of at least a portion of said guiding device is at least a size of an opening of said outlet at a furthest distal end of said gas-delivering device in order to divert said plasma into said space substantially radially with respect to an opening of said outlet of said gas-delivering device,wherein the guiding device comprises a concave surface at a surface facing the outlet of the gas-delivering device and a substantially hemispherical surface at a surface facing away from the outlet of the gas-delivering device, andwherein only the electrode and the guiding device, and no other portion, of the apparatus extend past the opening of said outlet at said furthest distal end of the gas-delivering device.
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Abstract
For the coagulation of tissue there are known instruments, in particular probes, that are designed to deliver argon gas into a space between an electrode within the probe and the tissue. In some cases the intention is to coagulate tissues situated at the side of the outlet of the probe. The invention provides an apparatus for coagulating tissue in which the distal end of the electrode projects out of the gas-delivering device or probe, and at said distal end a guiding device for directing and guiding the gas or plasma is disposed in such a way that at least part of the flowing gas or plasma is deflected into a predetermined direction.
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Citations
16 Claims
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1. An apparatus for coagulating tissue, comprising:
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an electrode adapted to produce a high-frequency current; a gas-delivering device having an outlet and being adapted to deliver an inert gas from said outlet into a space defined between said electrode and said tissue, such that a plasma is produced between said electrode and said tissue when said high-frequency current is applied to said inert gas, wherein a distal end of said electrode projects out of said outlet of said gas-delivering device; and a guiding device comprised of an electrically insulating material and disposed at said distal end of said electrode, said guiding device for directing and guiding said plasma such that at least a part of said plasma is diverted in a predetermined direction, wherein a cross-section of at least a portion of said guiding device is at least a size of an opening of said outlet at a furthest distal end of said gas-delivering device in order to divert said plasma into said space substantially radially with respect to an opening of said outlet of said gas-delivering device, wherein the guiding device comprises a concave surface at a surface facing the outlet of the gas-delivering device and a substantially hemispherical surface at a surface facing away from the outlet of the gas-delivering device, and wherein only the electrode and the guiding device, and no other portion, of the apparatus extend past the opening of said outlet at said furthest distal end of the gas-delivering device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for argon-plasma coagulating tissue, comprising:
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a gas-delivering device; an electrode disposed substantially coaxially with the gas-delivering device and configured to generate a high-frequency current, wherein a distal end of the electrode projects outward through an outlet of the gas-delivering device; and a guiding device disposed at the distal end of the electrode, wherein the guiding device is configured for guiding a plasma stream exiting the gas-delivering device, the plasma stream being produced when said high-frequency current is applied to an inert gas delivered by the gas-delivering device, wherein the guiding device is comprised of a material that is electrically insulating and thermally stable, wherein the guiding device is disposed in an axially symmetric manner around the distal end of the electrode and a cross-section of at least a portion of said guiding device is at least a size of an opening of said outlet at a furthest distal end of the gas-delivering device in order to divert the plasma stream into a surrounding space substantially radially with respect to the opening of the outlet of the gas delivering device, wherein the guiding device comprises a concave surface at a surface facing the outlet of the gas-delivering device and a substantially hemispherical surface at a surface facing away from the outlet of the gas-delivering device, and wherein only the electrode and the guiding device, and no other portion, of the apparatus extend past the opening of said outlet at said furthest distal end of the gas-delivering device. - View Dependent Claims (10, 11, 12, 13)
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14. An argon plasma coagulating probe assembly comprising:
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a tube; an electrode disposed substantially coaxially with the tube and configured to generate a high-frequency current, wherein a distal end of the electrode projects outward through an outlet of the tube; and a guiding device disposed at the distal end of the electrode, wherein the guiding device is configured for guiding an inert gas stream delivered from said outlet of the tube, wherein a cross-section of at least a portion of said guiding device is at least a size of an opening of said outlet at a furthest distal end of said tube in order to divert said inert gas stream substantially radially with respect to said opening of said outlet of said tube; wherein the guiding device is comprised of an electrically insulating and thermally stable material and is configured to have a concave surface at a surface facing the outlet of the gas-delivering device and a substantially hemispherical surface at a surface facing away from the outlet of the gas-delivering device to prevent mechanical damage if the guiding device touches the tissue, and wherein only the electrode and the guiding device, and no other portion, of the argon plasma coagulating probe assembly extend past the opening of said outlet at said furthest distal end of the tube. - View Dependent Claims (15, 16)
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Specification