RF tissue sealer, shear grip, trigger lock mechanism and energy activation

{
  "publication_number": "US10111699B2",
  "country": "US",
  "kind": "B2",
  "title": "RF tissue sealer, shear grip, trigger lock mechanism and energy activation",
  "abstract": "A variety of surgical instruments include one or more elements that transmit RF energy to tissue. Some such instruments comprise a pair of jaws that open and close on tissue, with conductive tissue contact surfaces that are operable to weld tissue clamped between the jaws. Some surgical instruments also include a translating tissue cutting element. Some such instruments may be in the form of forceps having a scissor grip. When an electrosurgical instrument includes grasping jaws and tissue severing capabilities it may be desirable to avoid accidental cutting by the knife. Hence, the instrument may include a feature that prevents the knife from firing until the jaws are sufficiently closed upon the tissue. It may also be desirable to prevent the jaws from being opened until the knife has been retracted. One or both of these features can prevent the knife from being extended while the jaws are open.",
  "claims": [
    "1. An electrosurgical instrument for operating on tissue, comprising: a first arm comprising a first handle and a first jaw; a second arm pivotally connected to the first arm, the second arm comprising: a second handle; a second jaw comprising an electrode operable to deliver radio frequency (RF) energy to tissue; an energy button operable to activate the RF energy; a knife configured to translate within slots defined in the first and second jaws; and a push plate operably connected to the knife such that a proximal motion of the push plate extends the knife and a distal motion of the push plate retracts the knife; and a knife lockout mechanism comprising a first end of a movement arm pivotally connected at a first end of the first arm, wherein the movement arm is operable to prevent operation of the knife.",
    "2. The electrosurgical instrument of claim 1, wherein the second arm comprises a pull ring integrated into the push plate to operate the knife.",
    "3. The electrosurgical instrument of claim 1, wherein the knife lockout mechanism comprises: a slot defined in the push plate; and a pin connected to a second end of the movement arm, wherein the pin is slidable within the slot.",
    "4. The electrosurgical instrument of claim 3, wherein the slot defined in the push plate comprises an upper portion and a lower portion.",
    "5. The electrosurgical instrument of claim 4, wherein the upper portion of the slot is at an angle to the direction of motion of the push plate to prevent the push plate from moving when the pin is located in the upper portion of the slot.",
    "6. The electrosurgical instrument of claim 4, wherein the lower portion of the slot is aligned with the direction of motion of the push plate to prevent the first and second jaws from opening when the pin is located in the lower portion of the slot.",
    "7. The electrosurgical instrument of claim 6, wherein the lower portion of the slot comprises one or more stops that prevent further movement of the knife.",
    "8. An electrosurgical instrument for operating on tissue, comprising: a first arm comprising a first handle and a first jaw; a second arm pivotally connected to the first arm, the second arm comprising: a second handle; a second jaw comprising an electrode operable to deliver radio frequency (RF) energy to tissue; an energy button operable to activate the RF energy; a knife configured to translate within slots defined in the first and second jaws; a push plate; a pull ring integrated into the push plate for operating the knife, the push plate operably connected to the knife such that a proximal motion of the push plate extends the knife and a distal motion of the push plate retracts the knife; and a knife lockout mechanism comprising a first end of a movement arm pivotally connected at a first end of the first arm, wherein the movement arm is configured to make a motion of the first arm and the pull ring proportional.",
    "9. The electrosurgical instrument of claim 8, comprising: a slot defined in the push plate; and a pin connected to a second end of the movement arm, wherein the pin is slidable within the slot.",
    "10. The electrosurgical instrument of claim 9, wherein the slot defined in the push plate is transverse to the direction of motion of the push plate, such that closing the first and second arms causes the push plate to move proximally and moving the push plate distally causes the first and second arms to open.",
    "11. An electrosurgical instrument for operating on tissue, comprising: a first arm comprising a first handle and a first jaw; a second arm pivotally connected to the first arm, the second arm comprising: a second handle; a second jaw comprising an electrode operable to deliver radio frequency (RF) energy to tissue; an energy button operable to activate the RF energy; and a knife configured to translate within the first and second jaws; a motion stop for a knife driving member; and a link attached to at least one of the first or second arm, wherein the link is slidably movable in a slot defined in one of the at least one of the first or second arm.",
    "12. The electrosurgical instrument of claim 11, further comprising a pull ring to operate the knife wherein the link is slidably movable in a slot in the pull ring.",
    "13. The electrosurgical instrument of claim 12, wherein the slot comprises an angled “L” shape slot, wherein one end of the L aligns with the slot in the at least one arm and another end of the L aligns with the motion the pull ring travels to engage the knife.",
    "14. The electrosurgical instrument of claim 12, wherein the link is configured to move with the at least one arm it is attached to such that, in an open state, the link prevents movement of the pull ring and in a lowered or a closed state, the link enables the pull ring to engage the knife and move.",
    "15. The electrosurgical instrument of claim 13, wherein the pull ring is transversely oriented relative to the angled L shape slot.",
    "16. The electrosurgical instrument of claim 12, wherein a motion of the pull ring and the at least one arm are proportional.",
    "17. The electrosurgical instrument of claim 16, wherein, as the first arm moves away from the second arm, the pull ring moves distally.",
    "18. The electrosurgical instrument of claim 17, wherein, as the pull ring moves proximally, the first and second arms move toward each other.",
    "19. The electrosurgical instrument of claim 17, wherein, in a full back position, the slot in the pull ring prevents the at least one arm from moving up."
  ],
  "description_excerpt": "The present disclosure relates generally to a radio frequency (RF) cutting forceps and various mechanism associated therewith.\n\nA variety of surgical instruments include one or more elements that transmit RF energy to tissue (e.g., to coagulate or seal the tissue). Some such instruments comprise a pair of jaws that open and close on tissue, with conductive tissue contact surfaces that are operable to weld tissue clamped between the jaws. In open surgical settings, some such instruments may be in the form of forceps having a scissor grip.\n\nIn addition to having RF energy transmission elements, some surgical instruments also include a translating tissue cutting element. Some versions of electrosurgical instruments that are operable to sever tissue may be selectively used in at least two modes. One such mode may include both severing tissue and coagulating tissue. Another such mode may include just coagulating tissue without also severing the tissue. Yet another mode may include the use of jaws to grasp and manipulate tissue without also coagulating and/or severing the tissue.\n\nWhen an electrosurgical instrument includes grasping jaws and tissue severing capabilities it may be desirable to avoid accidental cutting by the knife. Hence, the instrument may include a feature that prevents the knife from firing until the jaws are sufficiently closed upon the tissue. It may also be desirable to prevent the jaws from being opened until the knife has been retracted. One or both of these features can prevent the knife from being extended while the jaws are open.",
  "cpc": [
    "A61B 18/1442",
    "A61B 2017/00438",
    "A61B 2017/2946",
    "A61B 2018/00589",
    "A61B 2018/0063",
    "A61B 2018/00922",
    "A61B 2018/1455",
    "A61B 2018/146",
    "A61B 2090/0801"
  ],
  "ipc": [
    "A61B 18/14"
  ],
  "assignees": [
    "Ethicon LLC"
  ],
  "inventors": [
    "Chad P. Boudreaux"
  ],
  "filing_date": "2014-12-22",
  "publication_date": "2018-10-30",
  "grant_date": "2018-10-30",
  "priority_date": "2014-12-22",
  "application_number": "US-201414579623-A",
  "family_id": "56128135",
  "cited_by_count": 221,
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