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Surface-processing technology of a microgrooving and water-repellent coating improves the fusion potential of an ultrasonic energy device

Abstract

Background

Ultrasonic energy devices are essential for effective hemostasis during endoscopic surgery. Ultrasonic tissue transection occurs as a result of mechanical friction between the oscillating blade and the tissue. We hypothesized that blade surface structures and characteristics would affect tissue transection and sealing. The aim of this study was to clarify the efficacy of blade surface structures and characteristics in vessel sealing with an ultrasonic vibration.

Methods

We developed an ultrasonic energy device with 50-kHz vibration frequency and 50 μm amplitude. We manufactured four types of blade surface of the ultrasonic device using microprocessing technology: (1) a non-coated blade without microgrooves, (2) a non-coated blade with microgrooves, (3) a water-repellent-coated blade without microgrooves, and (4) a water-repellent-coated blade with microgrooves. We compared the performance of the four devices and a commercially available ultrasonic device with a non-coated blade without microgrooves in an ex vivo vessel-sealing experiment. We sealed porcine carotid arteries (3–5 mm diameter) using each device 20 times.

Results

The cutting time of the water-repellent-coated blade with microgrooves was the shortest (11.0 ± 3.4 s); however, it did not differ significantly from that of the commercial ultrasonic device (12.9 ± 2.9 s, p = 0.73). The burst pressure of the water-repellent-coated blade without microgrooves (1456 ± 425 mmHg) was significantly higher than that of the commercial ultrasonic device (966 ± 559 mmHg, p = 0.04). The sealing failure rate of the water-repellent blade with microgrooves was the lowest of all devices (0 %). Instrumental sticking of tissue decreased in the water-repellent devices. The sealing width was not significantly different.

Conclusion

The surface-processing of microgrooves and water-repellent coatings will improve the potential of ultrasonic devices with a fast transection and a high sealing reliability.

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Acknowledgments

This study was financially supported by a Grant for Support of Studies and Developments by Cooperation of Industry and Academia, Kyoto Industrial Support Organization 21 Foundation, 2014–2015, Kinugawa Factory, Kyoto, Japan, Kyoshin Electoric, Kyoto, Japan, Mostec, Kyoto, Japan, and Reverse Fit Design, Kyoto, Japan. The authors would like to thank Masayoshi Inoue (Division of Thoracic Surgery, Department of Surgery, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan) for his help in data interpretation and manuscript revision.

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Correspondence to Junichi Shimada.

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Junichi Shimada has a patent pending on “Rough surface blade” (Japan Patent Number 2014/195778). Satoru Okada, Kazuhiro Ito have no conflicts of interest or financial ties to disclose. Tatsuo Ishii is employed at Kinugawa Factory, Japan. Koichiro Oshiumi is employed at Reverse Fit Design, Japan.

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Okada, S., Shimada, J., Ito, K. et al. Surface-processing technology of a microgrooving and water-repellent coating improves the fusion potential of an ultrasonic energy device. Surg Endosc 31, 887–893 (2017). https://doi.org/10.1007/s00464-016-5048-x

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  • DOI: https://doi.org/10.1007/s00464-016-5048-x

Keywords

  • Ultrasonic energy device
  • Vessel sealing
  • Microgroove
  • Water-repellent coating
  • Blade surface structure
  • Blade surface characteristic