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公开(公告)号：JPH10286261A
公开(公告)日：1998-10-27
申请号：JP1149398
申请日：1998-01-23
Applicant: VALLEYLAB INC
Inventor： GINES DAVID LEE
Abstract: PROBLEM TO BE SOLVED: To provide performance which is improved in electric surgical blood vessel blockage and in tissue binding by reducing thermal propagation and charring. SOLUTION: A generator for electric surgical operation has an output power control system 10 or increasing and decreasing the impedance of a tissue 14 in a circulatory pattern until the tissue 14 is dried. Further, the output power is cyclically applied by the control system 10 having feed-back for the impedance of the tissue which obeys the circulatory pattern of the output power by several times, depending upon a condition of the tissue until the tissue is completely dried. Application of a high power causes the impedance of the tissue to reach a high value, and then, the power is reduced so as to allow the impedance to lower. Accordingly, this control system 10 is adaptive to the tissue in view of such a fact that the output power is tuned in response to an impedance of the tissue.
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公开(公告)号：AU738541B2
公开(公告)日：2001-09-20
申请号：AU5289998
申请日：1998-02-03
Applicant: VALLEYLAB INC
Inventor： GINES DAVID LEE
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公开(公告)号：CA2232018C
公开(公告)日：2002-02-12
申请号：CA2232018
申请日：1998-03-11
Applicant: VALLEYLAB INC
Inventor： GINES DAVID LEE
Abstract: An electrosurgical generator has an output power control system (10) that causes the impedance of tissue (14) to rise and fall in a cyclic pattern until the tiss ue (14) is desiccated. The advantage of the power control system (10) is that thermal spread and charri ng are reduced. In addition, the power control system (10) offers improved performance for electrosurgical vessel sealing and tissue welding. The output power is applied cyclically by a control syst em with tissue impedance feedback. The impedance of the tissue follows the cyclic pattern of the outp ut power several times, depending on the state of the tissue (14), until the tissue becomes fully desiccated. High power is applied to cause the tissue (14) to reach a high impedance, and then the pow er is reduced to allow the impedance to fall. Thermal energy is allowed to dissipate during the low pow er cycle. The control system is adaptive to tissue in the sense that output power is modulated in response to the impedance of the tissue.
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公开(公告)号：CA2232018A1
公开(公告)日：1998-10-09
申请号：CA2232018
申请日：1998-03-11
Applicant: VALLEYLAB INC
Inventor： GINES DAVID LEE
Abstract: An electrosurgical generator has an output power control system (10) that causes the impedance of tissue (14) to rise and fall in a cyclic pattern until the tissue ( 14) is desiccated. The advantage of the power control system (10) is that thermal spread and charring a re reduced. In addition, the power control system (10) offers improved performance for electros urgical vessel sealing and tissue welding. The output power is applied cyclically by a control system w ith tissue impedance feedback. The impedance of the tissue (14), until the tissue becomes fully desic cated. High power is applied to cause the tissue (14) to reach a high impedance, and then the power i s reduced to allow the impedance to fall. Thermal energy is allowed to dissipate during the low power c ycle. The control system is adaptive to tissue in the sense that output power is modulated in resp onse to the impedance of the tissue.
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