Vessel sensing for adaptive advanced hemostasis

{
  "publication_number": "US11678901B2",
  "country": "US",
  "kind": "B2",
  "title": "Vessel sensing for adaptive advanced hemostasis",
  "abstract": "An ultrasonic device may include an electromechanical ultrasonic system that includes an ultrasonic transducer coupled to an ultrasonic blade. A method of delivering energy to the ultrasonic device may include sensing a vessel type in contact with the blade, determining that the vessel type is either a vein or an artery, and delivering power to the transducer based on the vessel type. Power may be applied to the transducer at a power level P that differs from a nominal power level Pn for a period T that differs from a nominal period Tn based on the vessel. The power level P may be lower than Pn for a period T that is longer than Tn when the vessel is a vein. Alternatively, the power level P my be greater than Pn for a period T that is shorter than Tn when the vessel is an artery.",
  "claims": [
    "1. A method of delivering energy to an ultrasonic device, the ultrasonic device comprising an electromechanical ultrasonic system defined by a predetermined resonant frequency, the electromechanical ultrasonic system further comprising an ultrasonic transducer coupled to an ultrasonic blade, the method comprising: measuring, by a control circuit, a complex impedance of the ultrasonic transducer at a frequency f, wherein the complex impedance is defined as Z g ⁡ (t) = V g ⁡ (t) I g ⁡ (t); receiving, by the control circuit, a complex impedance measurement data point comprising an impedance magnitude |Z|, an impedance phase φ, and the frequency f; calculating, by the control circuit, a Euclidean distance between the complex impedence measurement data point and a data point in a reference complex impedance characteristic pattern; classifying, by the control circuit, the complex impedance measurement data point based on the Euclidean distance; assigning, by the control circuit, a vessel type in contact with the ultrasonic blade coupled to the ultrasonic transducer based on the Euclidean distance, wherein the vessel type is either a vein or an artery; delivering, by the control circuit, power to the ultrasonic transducer based on the vessel type; and applying power, by the control circuit, to the ultrasonic transducer at a power level P for a period T based on the assigned vessel type, wherein the power level P is different from a nominal power level Pn and the period T is different from a nominal period Tn, thereby sealing and cutting a vessel having the vessel type.",
    "2. The method of claim 1, wherein applying power to the ultrasonic transducer at a power level P for a period T comprises applying power to the ultrasonic transducer at a power level P that is lower than the nominal power level Pn for a period T that is longer than the nominal period Tn when the assigned vessel type is a vein.",
    "3. The method of claim 1, wherein applying power to the ultrasonic transducer at a power level P for a period T comprises applying power to the ultrasonic transducer at a power level P that is greater than the nominal power level Pn for a period T that is shorter than the nominal period Tn when the assigned vessel type is an artery.",
    "4. A method of applying energy to an ultrasonic device, the ultrasonic device comprising an electromechanical ultrasonic system defined by a predetermined resonant frequency, the electromechanical ultrasonic system comprising an ultrasonic transducer coupled to an ultrasonic blade, the method comprising: measuring, by a control circuit, a complex impedance of the ultrasonic transducer at a frequency f, wherein the complex impedance is defined as Z g ⁡ (t) = V g ⁡ (t) I g ⁡ (t); receiving, by the control circuit, a complex impedance measurement data point comprising an impedance magnitude |Z|, an impedance phase φ, and the frequency f; calculating, by the control circuit, a Euclidean distance between the complex impedance measurement data point and a data point in a reference complex impedance characteristic pattern; classifying, by the control circuit, the complex impedance measurement data point based on the Euclidean distance; assigning, by the control circuit, a vessel type in contact with the ultrasonic blade coupled to the ultrasonic transducer based on the Euclidean distance, wherein the vessel type is either a vein or an artery; and applying, by the control circuit, power to the ultrasonic transducer at a power level P for a period T based on the assigned vessel type, wherein the power level P is different from a nominal power level Pn and the period T is different from a nominal period Tn based on the vessel type, thereby sealing and cutting a vessel having the vessel type.",
    "5. The method of claim 4, further comprising: applying, by the control circuit, a power level to achieve a targeted ultrasonic blade temperature for a vein when the assigned vessel type is a vein; and receiving a feedback control, by the control circuit, to maintain the targeted ultrasonic blade temperature for the vein.",
    "6. The method of claim 4, comprising: applying, by the control circuit, a power level to achieve a targeted ultrasonic blade temperature for an artery when the assigned vessel type is an artery; and receiving a feedback control, by the control circuit, to maintain the targeted ultrasonic blade temperature for the artery.",
    "7. An ultrasonic surgical instrument comprising: an ultrasonic electromechanical system comprising an ultrasonic transducer coupled to an ultrasonic blade via an ultrasonic waveguide; and a generator configured to supply power to the ultrasonic transducer, wherein the generator comprises a control circuit configured to: measure a complex impedance of the ultrasonic transducer at a frequency f, wherein the complex impedance is defined as Z g ⁡ (t) = V g ⁡ (t) I g ⁡ (t); receive a complex impedance measurement data point comprising an impedance magnitude |Z|, an impedance phase φ, and the frequency f; calculate a Euclidean distance between the complex impedance measurement data point and a data point in a reference complex impedance characteristic pattern; classify the complex impedance measurement data point based on the Euclidean distance; assign a vessel type in contact with the ultrasonic blade coupled to the ultrasonic transducer based on the Euclidean distance, wherein the vessel type is either a vein or an artery; deliver power to the ultrasonic transducer based on the vessel type; and apply power to the ultrasonic transducer at a power level P for a period T based on the assigned vessel type, wherein the power level P is different from a nominal power level Pn and the period T is different from a nominal period Tn, to thereby seal and cut a vessel having the vessel type.",
    "8. The ultrasonic surgical instrument of claim 7, wherein the power level P is lower than the nominal power level Pn for a period T that is longer than the nominal period Tn when the assigned vessel type is a vein.",
    "9. The ultrasonic surgical instrument of claim 7, wherein the power level P that is greater than the nominal power level Pn for a period T that is shorter than the nominal period Tn when the assigned vessel type is an artery.",
    "10. An ultrasonic surgical instrument comprising: an ultrasonic electromechanical system comprising an ultrasonic transducer coupled to an ultrasonic blade via an ultrasonic waveguide; and a generator configured to supply power to the ultrasonic transducer, wherein the generator comprises a control circuit configured to: measure a complex impedance of the ultrasonic transducer at a frequency f, wherein the complex impedance is defined as Z g (t) = V g (t) I g (t); receive a complex impedance measurement data point comprising an impedance magnitude |Z|, an impedance phase φ, and the frequency f; calculate a Euclidean distance between the complex impedance measurement data point and a data point in a reference complex impedance characteristic pattern; classify the complex impedance measurement data point based on the Euclidean distance; assign a vessel type in contact with the ultrasonic blade coupled to the ultrasonic transducer based on the Euclidean distance, wherein the vessel type is either a vein or an artery; and apply power to the ultrasonic transducer at a power level P for a period T based on the assigned vessel type, wherein the power level P is different from a nominal power level Pn and the period T is different from a nominal period Tn based on the vessel type to thereby seal and cut a vessel having the vessel type.",
    "11. The ultrasonic surgical instrument of claim 10, wherein the generator comprises a control circuit further configured to: apply a power level to achieve a targeted ultrasonic blade temperature for a vein when the assigned vessel type is a vein; and receive a feedback control to maintain the targeted ultrasonic blade temperature for the vein.",
    "12. The ultrasonic surgical instrument of claim 10, wherein the generator comprises a control circuit further configured to: apply a power level to achieve a targeted ultrasonic blade temperature for an artery when the assigned vessel type is an artery; and receive a feedback control to maintain the targeted ultrasonic blade temperature for the artery."
  ],
  "description_excerpt": "In a surgical environment, smart energy devices may be needed in a smart energy architecture environment. Ultrasonic surgical devices, such as ultrasonic scalpels, are finding increasingly widespread applications in surgical procedures by virtue of their unique performance characteristics. Depending upon specific device configurations and operational parameters, ultrasonic surgical devices can provide substantially simultaneous transection of tissue and homeostasis by coagulation, desirably minimizing patient trauma. An ultrasonic surgical device may comprise a handpiece containing an ultrasonic transducer, and an instrument coupled to the ultrasonic transducer having a distally-mounted end effector (e.g., a blade tip) to cut and seal tissue. In some cases, the instrument may be permanently affixed to the handpiece. In other cases, the instrument may be detachable from the handpiece, as in the case of a disposable instrument or an interchangeable instrument. The end effector transmits ultrasonic energy to tissue brought into contact with the end effector to realize cutting and sealing action. Ultrasonic surgical devices of this nature can be configured for open surgical use, laparoscopic, or endoscopic surgical procedures including robotic-assisted procedures.\n\nUltrasonic energy cuts and coagulates tissue using temperatures lower than those used in electrosurgical procedures and can be transmitted to the end effector by an ultrasonic generator in communication with the handpiece. Vibrating at high frequencies (e.g., 55,500 cycles per second), the ultrasonic blade denatures protein in the tissue to form a sticky coagulum.",
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  "assignees": [
    "Cilag GmbH International"
  ],
  "inventors": [
    "Patrick J. Scoggins",
    "Madeleine C. Jayme",
    "Kristen G. Denzinger",
    "Cameron R. Nott",
    "Craig N. Faller"
  ],
  "filing_date": "2018-09-27",
  "publication_date": "2023-06-20",
  "grant_date": "2023-06-20",
  "priority_date": "2018-03-08",
  "application_number": "US-201816144434-A",
  "family_id": "67842845",
  "cited_by_count": 18,
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