Pressure-maintaining smoke evacuation in an insufflator

{
  "publication_number": "US10384021B2",
  "country": "US",
  "kind": "B2",
  "title": "Pressure-maintaining smoke evacuation in an insufflator",
  "abstract": "The present invention relates to an insufflator with a flue gas extraction, which is configured such that the abdominal pressure remains substantially constant during the extraction process.",
  "claims": [
    "1. An insufflator for minimally invasive surgery, comprising a) a gas connection with a proportional valve, b) a supply line with a pressure measurement, filter, and connection to a first trocar, c) a second trocar with an extraction hose and filter, connected to an extraction device with an adjustable extraction capacity for extracting insufflation gas such that all insufflation gas that is extracted from a body cavity is always discharged to the atmosphere, and d) an electronic control unit, wherein the electronic control unit adjusts the extraction device in dependence on the pressure in the supply line.",
    "2. The insufflator of claim 1, wherein the electronic control unit decreases the extraction rate by control of the extraction device, when the pressure in the supply line exceeds a certain threshold value, and/or that the electronic control unit increases the extraction rate by control of the extraction device, when the pressure in the supply line falls below a certain threshold value.",
    "3. The insufflator of claim 2, wherein the threshold value for decreasing the extraction rate for the pressure in the supply line is between 60 and 80 mm Hg.",
    "4. The insufflator of claim 2, wherein the threshold value for increasing the extraction rate for the pressure in the supply line is between 0 and 50 mm Hg.",
    "5. The insufflator of claim 1, wherein the extraction device with an adjustable extraction capacity consists of an adjustable suction pump or of a suction pump with an adjustable by-pass valve or of a suction pump with an additional adjustable proportional valve.",
    "6. The insufflator of claim 1, wherein the extraction device with an adjustable extraction capacity is connected to an external pump, and the extraction capacity is controlled through an adjustable valve.",
    "7. The insufflator of claim 1, wherein an insufflation capacity being adjustable between 0 and 50 l/min.",
    "8. The insufflator of claim 7, wherein an extraction capacity being adjustable between 0 and 20 l/min.",
    "9. The insufflator of claim 8, wherein an extraction capacity being adjustable between 0 and 10 l/min.",
    "10. The insufflator of claim 1, wherein a gas heating device is located in the gas supply line."
  ],
  "description_excerpt": "The present invention relates to an insufflator with a flue gas extraction, which is configured such that the abdominal pressure remains substantially constant during the extraction process. The priority of the German application DE 102013016063.4 (date of fling 27 Sep. 2014) is claimed.\n\nIn the field of minimally invasive surgery, for example diagnostic or therapeutic laparoscopy, an overpressure is generated in the abdomen by means of introduced gases (e.g., medical carbon dioxide (CO 2)), said overpressure expanding the abdomen, in order that sufficient space is available for the visual inspection or the therapeutic procedure. For this purpose, so-called insufflators are used, which build up, by means of an adjusted gas flow, a controlled pressure in the abdomen. By a series of safety devices it is secured that the abdominal pressure is kept within limits, so that no tissue is damaged.\n\nIn the field of minimally invasive surgery, frequently electro-surgical devices or also lasers are used, the application of which will generate smoke in the abdomen. This smoke does not only obstruct the view, but contains contaminants (in the form of gases, droplets, and/or particles), so that this smoke has to be removed from the abdomen. A solution of this problem is that a simple outlet is formed, through which the flue gases exit from the body. A possibility of implementation for this is shown in U.S. Pat. No. 6,592,543. The extraction process is manually controlled by the surgeon by opening the valve at the trocar. However, current systems frequently produce larger amounts of smoke than at the date of filing of U.S. Pat. No.",
  "cpc": [
    "A61M 13/003",
    "A61B 18/00",
    "A61B 18/1482",
    "A61B 18/20",
    "A61B 2218/008",
    "A61B 90/02",
    "A61M 16/16",
    "A61M 16/203",
    "A61M 2202/0225",
    "A61M 2205/07",
    "A61M 2205/3334",
    "A61M 2205/3337",
    "A61M 2205/3344",
    "A61M 2205/50",
    "A61M 2205/75"
  ],
  "ipc": [
    "A61M 13/00"
  ],
  "assignees": [
    "WOM World of Medicine GmbH"
  ],
  "inventors": [
    "Yves Koeth",
    "Sebastian Stegemann"
  ],
  "filing_date": "2014-09-26",
  "publication_date": "2019-08-20",
  "grant_date": "2019-08-20",
  "priority_date": "2013-09-27",
  "application_number": "US-201415024947-A",
  "family_id": "51867952",
  "cited_by_count": 208,
  "citations": [
    "US4971034A",
    "US4735603A",
    "US4836187A",
    "DE3922746C1",
    "DE4219859A1",
    "US5411474A",
    "US6592543B1",
    "WO2004009167A1",
    "WO2007023565A1",
    "US7806850B2",
    "WO2011041387A1",
    "WO2012012379A1",
    "WO2014111084A1",
    "WO2014111083A1"
  ]
}