The invention of microwave surgical scissors for seamless coagulation and cutting

Tani, Tohru; Naka, Shigeyuki; Tani, Soichiro; Shiomi, Hiroya; Murakami, Kayo; Yamada, Atsushi; Dang, Khiem Tran

doi:10.1007/s00595-018-1662-7

Cited by 22 publications

(26 citation statements)

References 11 publications

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“…The abovementioned results show that MS is an energy device that can achieve a firm sealing edge, less sticking, and limited heat-induced injuries on treated tissues. Although MS was developed based on microwave technologies qualified for medical applications similar to MWCX, 16 its mechanical design was not studied for cutting but grasping tissues. Integrating a cutting blade or scissors into the current design is a feasible option to provide a multifunctional MS comparable to the predicate UADs.…”

Section: Discussionmentioning

confidence: 99%

Vessel-Sealing Capability of Novel Microwave Sealer: Experimental Study in Animal Models

et al. 2020

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Background. Ultrasonically activated dissectors (UADs) and radiofrequency-based devices have been considered excellent surgical devices because of their reliability and flexibility. Meanwhile, microwave-based devices have demonstrated potential with their unique heating mechanism. This study aims to compare the sealing function of a newly invented forceps-like microwave sealer (MS) with that of currently available UADs. Materials and Methods. MS and 2 examples of UADs (Harmonic Focus+ [HF+] and Sonicision [SNC]) were employed to perform mesenterectomies (in vivo) and sealing sizable vessels (ex vivo). Vessel diameter, seal time, burst pressure (BP), sealing completion, and instrument sticking were recorded. The samples underwent histological investigation for thermal damage evaluation. Results. During mesenterectomies, MS required 3 seconds and 30 W to secure a complete seal. The BP achieved by the MS seal was higher than that of HF+ and SNC on arteries (851 ± 203.7 vs 682.4 ± 287.3, P < .05; vs 833.1 ± 251.2 mmHg, P = .4523, respectively) but was not statistically different on veins (324.9 ± 203.5 vs 460.1 ± 320.3 vs 508.3 ± 350.7 mmHg, P = .215). In all trials, MS caused less sticking but exhibited similar heat-induced alterations to UADs. MS’s thermal spread was not statistically more extended than that of UADs on either arteries or veins. Conclusions. MS was capable of not only sealing tiny vessels but also achieving high-pressure endurance on sizable vessels. Its forceful grasping and synchronous heating process helped create solid stumps with an acceptable thermal spread.

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Section: Discussionmentioning

confidence: 99%

Vessel-Sealing Capability of Novel Microwave Sealer: Experimental Study in Animal Models

et al. 2020

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“…Two microwave surgical devices (Acrosurg, Nikkiso Co., Ltd., Tokyo, Japan), which have been commercialized based on our MWCX, were used in this study (20,22,23). One was the Acrosurg Scissors S09 (AS), and the other was the Acrosurg Tweezers S22 (AT).…”

Section: Instrumentsmentioning

confidence: 99%

“…Amid the booming development of modern energy devices, our group invented microwave coagulation surgical instruments (MWCX) for use in many surgical procedures (19)(20)(21). The unique microwave dielectric heating by these original MWCX has demonstrated advantages of sealing sizable vessels (20,22) as well as coagulating fragile parenchyma (spleen, liver) (21,23). In 2017, two types of microwave surgical devices with improved coagulation power and energy efficiency of MWCX were released commercially: a scissors-type for seamless "sealand-cut" dissection and a tweezers-type for forceful grasping and sealing of tissues.…”

Section: Introductionmentioning

confidence: 99%

“…Based on MWCXs' excellent tissue coagulation reported in previous studies (19)(20)(21)(22)(23), we hypothesized that using the new microwave scissors alone would enable PH and GP sealing, whereas the single microwave tweezers would be sufficient to reduce blood loss in this procedure. Therefore, this experimental study was set up to assess the feasibility of using the scissorstype or tweezers-type microwave devices as a single surgical instrument to achieve a safe and simple PH with respect to less bleeding, less risk of bile leaks, and the use of fewer instruments.…”

Section: Introductionmentioning

confidence: 99%

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Feasibility of Microwave-Based Scissors and Tweezers in Partial Hepatectomy: An Initial Assessment on Canine Model

et al. 2021

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Purpose: This study aimed to assess the feasibility of partial hepatectomy (PH) simplified by using microwave-based devices in animal experiments.Methods: PH was performed on 16 beagles using either Acrosurg Scissors (AS) or Acrosurg Tweezers (AT) without hepatic pedicle (HP) control. Parenchymal transection time, Glissonean pedicle (GP) seal time, bleeding volume, bile leak, and burst pressure were recorded. Probable complications were investigated after 4 weeks.Results: Transection time (6.5 [6.0–7.6] vs. 11.8 [10.5–20.2] min, p < 0.001) with AT were significantly shorter than with AS. GP sealing times (60 [55–60] vs. 57 [46–91] s, p = 0.859) by both devices were nearly similar. Bleeding volume in the AT group was approximately one-fourth of that in the AS group (6.7 [1.4–22] vs. 28.8 [5.8–48] mL, p = 0.247). AT created higher burst pressure on the bile duct stumps (p = 0.0161). The two devices did not differ significantly in morbidity and mortality after four-week follow-up.Conclusion: Acrosurg devices achieved a safe PH without HP control owing to microwave-based sealing. AS could be used alone in PH, whereas the clamp-crushing function of AT seemed more advantageous in reducing the transection time and blood loss.

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“…Because thermal damage (coagulation) to neighboring organs may cause postoperative pain and serious complications [11,12,13], it is necessary to evaluate the heating characteristic of tissues surrounding the device. Particularly, a microwave surgical device [14,15,16] is a new device having insufficient survey data compared with conventional surgical devices (e.g., electrical scalpel). Therefore, evaluating the distribution of coagulated region generated by a microwave surgical device is an important issue.…”

Section: Introductionmentioning

confidence: 99%

Coagulated region analysis in a microwave surgical device with temperature-dependent physical properties of tissue

Manago

Saito

2019

IEICE Electron. Express

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In surgical devices, it is pointed out that tissues around these devices may experience thermal damage (coagulation). Therefore, evaluating the coagulated region generated by a microwave surgical device is an important issue. In this paper, we estimate the distribution of the coagulated region using numerical calculation. Then, there is a possibility that the calculated results will be affected by change to the electrical and thermal constants during heating. Therefore, the temperature dependence of the tissue was considered. As a result, it was confirmed that the coagulation width at the center of the lower blade was 0.5 mm larger than that without temperature dependence.

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The invention of microwave surgical scissors for seamless coagulation and cutting

Abstract: The MWCX showed similar levels of functionality and safety to HF, as well as the advantages offered by the use of microwave energy. Microwave devices might be used in the majority of applications for which traditional energy devices are used.

Cited by 22 publications

References 11 publications

Vessel-Sealing Capability of Novel Microwave Sealer: Experimental Study in Animal Models

Vessel-Sealing Capability of Novel Microwave Sealer: Experimental Study in Animal Models

Feasibility of Microwave-Based Scissors and Tweezers in Partial Hepatectomy: An Initial Assessment on Canine Model

Coagulated region analysis in a microwave surgical device with temperature-dependent physical properties of tissue

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