# US 2019/0320522 A1 · Plasma-generating device, plasma surgical device and use of a plasma surgical device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0320522 A1 - Document ID: US20190320522A1 - Status: Published application - Kind: A1 - Application number: 16/227,805 - Filed: 2018-12-20 - Published: 2019-10-17 - Earliest claimed: 2005-07-08 - Assignees: Plasma Surgical Investments Limited - Applicants: Plasma Surgical Investments Limited - Inventors: Nikolay SUSLOV; Igor RUBINER - Web page: https://patentgrep.com/patent/US20190320522A1 ## CPC - H05H 1/28: Cooling arrangements - H05H 1/34: Details, e.g. electrodes, nozzles - H05H 1/341: {Arrangements for providing coaxial protecting fluids} - H05H 1/3452: {Supplementary electrodes between cathode and anode, e.g. cascade} - H05H 1/3484: {Convergent-divergent nozzles} - H05H: PLASMA TECHNIQUE (apparatus or processes specially adapted for producing X-rays H05G2/00); PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS ## Abstract 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. Further, 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. The invention also concerns a plasma surgical device and use of such a plasma surgical device. ## Claims ### Claim at position 1 1-23. (canceled) ### Claim 24 A plasma-generating device, comprising: a plasma chamber configured to generate plasma; a cathode having a tapering tip, the tapering tip having a first portion disposed proximal to the plasma chamber and a second portion extending into the plasma chamber; and a coolant channel configured to receive a coolant such that the coolant flowing through the coolant channel can cool a portion of the plasma-generating device adjacent to the cooling channel. ### Claim 25 (depends on 24) The plasma-generating device of claim 24, wherein the coolant channel includes a coolant outlet configured to discharge the coolant. ### Claim 26 (depends on 25) The plasma-generating device of claim 25, wherein the coolant outlet is arranged around a plasma outlet such that the coolant discharged through the coolant outlet can restrict a flow of the plasma discharged from the plasma outlet. ### Claim 27 (depends on 25) The plasma-generating device of claim 25, wherein the coolant channel is configured to discharge the coolant through the coolant outlet at a rate of between 1 and 5 ml/s. ### Claim 28 (depends on 24) The plasma-generating device of claim 24, further comprising: a plasma channel extending longitudinally from the plasma chamber to a plasma outlet, the plasma channel and the plasma outlet defining a discharge path for the plasma. ### Claim 29 (depends on 28) The plasma-generating device of claim 28, wherein the coolant channel is substantially parallel to the plasma channel. ### Claim 30 (depends on 28) The plasma-generating device of claim 28, wherein the tapering tip of the cathode is disposed a non-zero distance away from an inlet of the plasma channel. ### Claim 31 (depends on 28) The plasma-generating device of claim 28, wherein the plasma channel is configured to discharge a plasma jet through the plasma outlet, and the coolant channel includes a coolant outlet configured to discharge the coolant to restrict the plasma jet. ### Claim 32 A plasma-generating device, comprising: a cathode having a tapering tip; a sleeve having a portion that surrounds a portion of the tapering tip, the portion of the sleeve having a substantially constant inner diameter such that a space between an inner surface of the sleeve and the cathode increases along a length of the tapering tip in a distal direction; and a coolant channel configured to receive a coolant such that the coolant flowing through the coolant channel can cool a portion of the plasma-generating device adjacent to the cooling channel. ### Claim 33 (depends on 32) The plasma-generating device of claim 32, further comprising: an anode, wherein the tapering tip of the cathode narrows toward the anode. ### Claim 34 (depends on 33) The plasma-generating device of claim 33, wherein the coolant channel includes a coolant outlet that is disposed in the anode. ### Claim 35 (depends on 34) The plasma-generating device of claim 34, wherein the coolant outlet is arranged around a plasma outlet such that the coolant discharged through the coolant outlet can restrict a flow of the plasma discharged from the plasma outlet. ### Claim 36 (depends on 34) The plasma-generating device of claim 34, wherein the coolant channel is configured to discharge the coolant through the coolant outlet at a rate of between 1 and 5 ml/s. ### Claim 37 A plasma-generating device, comprising: an insulator sleeve having a distal end; a cathode having a tapered portion, the tapered portion having a first portion disposed within the insulator sleeve and a second portion projecting beyond the insulator sleeve; a plasma channel extending longitudinally from the cathode and having an outlet at an end of the plasma channel; and a coolant channel configured to receive a coolant such that the coolant flowing through the coolant channel can cool a portion of the plasma-generating device adjacent to the cooling channel. ### Claim 38 (depends on 37) The plasma-generating device of claim 37, wherein at least a portion of the coolant channel is substantially parallel to the plasma channel. ### Claim 39 (depends on 37) The plasma-generating device of claim 37, wherein the coolant channel includes a coolant outlet configured to discharge the coolant. ### Claim 40 (depends on 39) The plasma-generating device of claim 39, wherein an angle between a direction of the coolant channel at the outlet and a direction of the plasma channel is between +30 and −30 degrees. ### Claim 41 (depends on 40) The plasma-generating device of claim 40, wherein the angle is zero. ### Claim 42 (depends on 39) The plasma-generating device of claim 39, wherein the outlet of the coolant channel angles toward the outlet of the plasma channel. ### Claim 43 (depends on 37) The plasma-generating device of claim 37, wherein the tapered portion of the cathode is disposed a non-zero distance away from an inlet of the plasma channel.