대한의용생체공학회:의공학회지 (Journal of Biomedical Engineering Research)

  • 제34권3호
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  • Pages.141-147
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  • 2013
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  • 1229-0807(pISSN)
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  • 2288-9396(eISSN)
대한의용생체공학회 (The Korean Society of Medical and Biological Engineering)
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초음파 수술기의 수술 효율성 향상을 위한 진동자 임피던스 측정에 따른 조직 분류 연구

Classification of Organs Using Impedance of Ultrasonic Surgical Knife to improve Surgical Efficiency

  • 김홍래 (국립암센터 융합기술연구부 의공학연구과) ;
  • 김성천 (국립암센터 융합기술연구부 의공학연구과) ;
  • 김광기 (국립암센터 융합기술연구부 의공학연구과) ;
  • 김영우 (국립암센터 이행성 임상 제1연구부 위암연구과)
  • Kim, Hong Rae (Biomedical Engineering Branch, Division of Convergence Technology, National Cancer Center) ;
  • Kim, Sung Chun (Biomedical Engineering Branch, Division of Convergence Technology, National Cancer Center) ;
  • Kim, Kwang Gi (Biomedical Engineering Branch, Division of Convergence Technology, National Cancer Center) ;
  • Kim, Young-Woo (Gastric Branch, Research Institute & Hospital, National Cancer Center)
  • 투고 : 2013.06.19
  • 심사 : 2013.09.09
  • 발행 : 2013.09.30
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초록

Ultrasonic shears is currently in wide use as an energy device for minimal invasive surgery. There is an advantage of minimizing the carbonization behavior of the tissue due to the vibrational energy transfer system of the transducer by applying a piezoelectric ceramic. However, the vibrational energy transfer system has a pitfall in energy consumption. When the movement of the forceps is interrupted by the tissue, the horn which transfers the vibrational energy of the transducer will be affected. A study was performed to recognize different tissues by measuring the impedance of the transducer of the ultrasonic shears in order to find the factor of energy consumption according to the tissue. In the first stage of the study, the voltage and current of the transducer connecting portion were measured, along with the phase changes. Subsequently, in the second stage, the impedance of the transducer was directly measured. In the final stage, using the handpiece, we grasped the tissue and observed the impedance differences appeared in the transducer To verify the proposed tissue distinguishing method, we used the handpiece to apply a force between 5N and 10N to pork while increasing the value of the impedance of the transducer from 400 ${\Omega}$.. It was found that fat and skin tissue, tendon, liver and protein all have different impedance values of 420 ${\Omega}$, 490 ${\Omega}$, 530 ${\Omega}$, and 580 ${\Omega}$, respectively. Thus, the impedance value can be used to distinguish the type of tissues grasped by the forceps. In the future study, this relationship will be used to improve the energy efficiency of ultrasonic shears.

키워드

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