US 11,986,233 B2
Adjustment of complex impedance to compensate for lost power in an articulating ultrasonic device
Maxwell T. Rockman, Cincinnati, OH (US); and Gregory D. Bishop, Hamilton, OH (US)
Assigned to Cilag GmbH International, Zug (CH)
Filed by Cilag GmbH International, Zug (CH)
Filed on Sep. 27, 2018, as Appl. No. 16/144,418.
Claims priority of provisional application 62/640,415, filed on Mar. 8, 2018.
Prior Publication US 2019/0274662 A1, Sep. 12, 2019
Int. Cl. A61B 18/12 (2006.01); A61B 8/00 (2006.01); A61B 17/00 (2006.01); A61B 17/32 (2006.01); A61B 17/3211 (2006.01); A61B 18/14 (2006.01); A61B 90/00 (2016.01); B06B 1/06 (2006.01); G05B 19/05 (2006.01); H03H 9/00 (2006.01); A61B 17/28 (2006.01); A61B 17/29 (2006.01); A61B 18/00 (2006.01); A61B 34/30 (2016.01)
CPC A61B 18/1206 (2013.01) [A61B 8/4483 (2013.01); A61B 8/56 (2013.01); A61B 17/00234 (2013.01); A61B 17/320068 (2013.01); A61B 17/320092 (2013.01); A61B 17/3211 (2013.01); A61B 18/1442 (2013.01); A61B 18/1445 (2013.01); A61B 90/08 (2016.02); B06B 1/0644 (2013.01); G05B 19/058 (2013.01); H03H 9/0004 (2013.01); A61B 2017/00017 (2013.01); A61B 2017/00022 (2013.01); A61B 2017/0003 (2013.01); A61B 2017/00039 (2013.01); A61B 2017/00061 (2013.01); A61B 2017/00106 (2013.01); A61B 2017/00119 (2013.01); A61B 2017/00154 (2013.01); A61B 2017/00185 (2013.01); A61B 2017/00199 (2013.01); A61B 2017/00221 (2013.01); A61B 2017/0023 (2013.01); A61B 2017/00398 (2013.01); A61B 2017/00477 (2013.01); A61B 2017/00482 (2013.01); A61B 2017/0084 (2013.01); A61B 17/282 (2013.01); A61B 2017/2927 (2013.01); A61B 2017/32007 (2017.08); A61B 2017/320071 (2017.08); A61B 2017/320074 (2017.08); A61B 2017/320084 (2013.01); A61B 2017/320094 (2017.08); A61B 2017/320095 (2017.08); A61B 2017/320097 (2017.08); A61B 2018/00589 (2013.01); A61B 2018/00595 (2013.01); A61B 2018/00601 (2013.01); A61B 2018/00619 (2013.01); A61B 2018/0063 (2013.01); A61B 2018/00684 (2013.01); A61B 2018/00791 (2013.01); A61B 2018/00827 (2013.01); A61B 2018/00875 (2013.01); A61B 2018/00892 (2013.01); A61B 2018/00994 (2013.01); A61B 2018/1253 (2013.01); A61B 2018/126 (2013.01); A61B 2018/128 (2013.01); A61B 2018/1455 (2013.01); A61B 34/30 (2016.02); A61B 2090/0804 (2016.02); A61B 2090/0807 (2016.02); A61B 2090/0808 (2016.02); A61B 2090/0809 (2016.02); A61B 2217/005 (2013.01); A61B 2218/002 (2013.01); A61B 2218/008 (2013.01); G05B 2219/14074 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An ultrasonic surgical instrument comprising:
an ultrasonic electromechanical system comprising an ultrasonic transducer coupled to an articulatable ultrasonic blade via a flexible ultrasonic waveguide; and
a generator to supply power to the ultrasonic transducer, wherein the generator comprises a control circuit configured to:
sweep the articulatable ultrasonic blade through a range of articulation angles from a first articulation angle to a second articulation angle at one or more predetermined angular increments;
activate the ultrasonic transducer at an energy level at each of the one or more predetermined angular increments;
measure a complex impedance of the ultrasonic transducer at each of the one or more predetermined angular increments;
record a set of complex impedance measurements at each of the one or more predetermined angular increments;
generate reference complex impedance characteristic patterns as a function of the one or more predetermined angular increments;
store the reference complex impedance characteristic patterns in a memory or a database;
determine a third articulation angle of the articulatable ultrasonic blade;
adjust the complex impedance of the ultrasonic transducer to compensate for power lost as a function of the one or more predetermined angular increments; and
adjust a power applied to the ultrasonic transducer based on the third articulation angle.