# US 2023/0065731 A1 · Closed loop smoke filtration system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2023/0065731 A1 - Document ID: US20230065731A1 - Status: Published application - Kind: A1 - Application number: 17/863,512 - Filed: 2022-07-13 - Published: 2023-03-02 - Earliest claimed: 2021-08-26 - Assignees: Covidien LP - Applicants: Covidien LP - Inventors: Henry E. Holsten - Web page: https://patentgrep.com/patent/US20230065731A1 ## CPC - A61M 13/006: {with gas recirculation} - B03C 3/017: Combinations of electrostatic separation with other processes, not otherwise provided for - B03C 3/019: Post-treatment of gases - B03C 3/09: characterised by presence of stationary flat electrodes arranged with their flat surfaces at right angles to the gas stream - B03C 3/12: characterised by separation of ionising and collecting stations - B03C 3/155: Filtration - B03C 3/32: Transportable units, e.g. for cleaning room air - B03C 3/41: Ionising-electrodes - B03C 3/47: flat, e.g. plates, discs, gratings - B03C 3/60: Use of special materials other than liquids - A61B 18/00: Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body (eye surgery A61F9/007; ear surgery A61F11/00) - A61B 2218/008: for smoke evacuation - A61M 2205/07: having air pumping means - A61M 2205/126: with incorporated membrane filters - A61M 2205/7509: for virus - A61M 2205/7518: bacterial - A61M 2205/7545: for solid matter, e.g. microaggregates - A61M 2205/8206: battery-operated - B03C 2201/26: for use in medical or biological applications - A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)} - B03C: MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS (separating isotopes B01D59/00; combinations of magnetic or electrostatic separation with separation of solids by other means B03B, B07B) - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract A closed loop filtration system includes first and second trocars providing sealed access to a body cavity, a power supply, first and second ionizer units electrically coupled to the power supply, and a filter cartridge. The filter cartridge includes an inlet in communication with the first trocar, an outlet in communication with the second trocar, a first electrode disposed downstream of the inlet of the filter cartridge, and a second electrode disposed downstream of the first electrode. The first electrode is electrically coupled to the first ionizer unit to ionize airborne particulate matter flowing therethrough. The second electrode is electrically coupled to the second ionizer unit and configured to attract the airborne particulate matter that is ionized by the first electrode. ## Claims ### Claim 1 A closed loop filtration system comprising: first and second trocars providing sealed access to a body cavity; a power supply; first and second ionizer units electrically coupled to the power supply; and a filter cartridge including: an inlet in communication with the first trocar; an outlet in communication with the second trocar; a first electrode disposed downstream of the inlet of the filter cartridge, the first electrode electrically coupled to the first ionizer unit to ionize airborne particulate matter flowing therethrough; and a second electrode disposed downstream of the first electrode, the second electrode electrically coupled to the second ionizer unit and configured to attract the airborne particulate matter that is ionized by the first electrode. ### Claim 2 (depends on 1) The closed loop filtration system according to claim 1, further including a pump connected to the outlet of the filter cartridge to direct a fluid from the first trocar to the filter cartridge. ### Claim 3 (depends on 2) The closed loop filtration system according to claim 2, further including an insufflation source connector that is coupled to an insufflation source and the second trocar. ### Claim 4 (depends on 3) The closed loop filtration system according to claim 3, wherein the insufflation source connector is also connected to an outlet of the pump. ### Claim 5 (depends on 1) The closed loop filtration system according to claim 1, wherein the first or second electrode is a mesh. ### Claim 6 (depends on 1) The closed loop filtration system according to claim 1, wherein the filter cartridge further includes a mechanical filter. ### Claim 7 (depends on 6) The closed loop filtration system according to claim 6, wherein the mechanical filter is a HEPA or ULPA filter. ### Claim 8 (depends on 1) The closed loop filtration system according to claim 1, wherein the power supply provides an output voltage between about 10k VDC to 30k VDC. ### Claim 9 (depends on 1) The closed loop filtration system according to claim 1, wherein the power supply is a lithium-ion battery. ### Claim 10 (depends on 1) The closed loop filtration system according to claim 1, wherein the first electrode is negatively charged. ### Claim 11 A closed loop filtration system comprising: a first trocar configured to supply a fluid into a body cavity; a second trocar configured to discharge the fluid from the body cavity; a power supply; first and second ionizer units electrically coupled to the power supply; and a filter cartridge including: an outlet in communication with the first trocar; an inlet in communication with the second trocar; a first electrode disposed downstream of the inlet of the filter cartridge, the first electrode electrically coupled to the first ionizer unit to electrically charge airborne particulate matter passing through the first electrode; and a second electrode disposed downstream of the first electrode, the second electrode electrically coupled to the second ionizer unit and configured to attract the airborne particulate matter that is electrically charged by the first electrode. ### Claim 12 (depends on 11) The closed loop filtration system according to claim 11, wherein the fluid is an insufflation gas. ### Claim 13 (depends on 11) The closed loop filtration system according to claim 11, wherein the filter cartridge further includes a mechanical filter that is disposed downstream of the second electrode. ### Claim 14 (depends on 11) The closed loop filtration system according to claim 11, further including a pump electrically coupled to the power supply and having a pump inlet in communication with the outlet of the filter cartridge and a pump outlet in communication with the first trocar. ### Claim 15 (depends on 11) The closed loop filtration system according to claim 11, wherein the pump has an output of about 15 liters per minute. ### Claim 16 (depends on 11) The closed loop filtration system according to claim 11, wherein the first or second electrodes is formed of stainless steel. ### Claim 17 (depends on 11) The closed loop filtration system according to claim 11, wherein the first or second electrodes is a mesh. ### Claim 18 (depends on 11) The closed loop filtration system according to claim 11, further including an insufflation source connector disposed downstream of the pump outlet, the insufflation source connector coupled to an insufflation gas source. ### Claim 19 (depends on 14) The closed loop filtration system according to claim 14, wherein the pump is a diaphragm pump. ### Claim 20 (depends on 11) The closed loop filtration system according to claim 11, wherein the power supply is a lithium-ion battery.