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Combination of water-jet dissection and needle-knife as a hybrid knife simplifies endoscopic submucosal dissection

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Abstract

Background

The safety and efficacy of endoscopic submucosal dissection (ESD) is very dependent on an effective injection beneath the submucosal lamina and on a controlled cutting technique. After our study group demonstrated the efficacy of the HydroJet in needleless submucosal injections under various physical conditions to create a submucosal fluid cushion (Selective tissue elevation by pressure = STEP technique), the next step was to develop a new instrument to combine the capabilities of an IT-Knife with a high-pressure water-jet in a single instrument. In this experimental study, we compared this new instrument with a standard ESD technique.

Methods

Twelve gastric ESD were performed in six pigs under endotracheal anesthesia. Square areas measuring 4-cm × 4-cm were marked out on the anterior and posterior wall in the corpus-antrum transition region. The HybridKnife was used as an standard needle knife with insulated tip (i.e., the submucosal injection was performed with an injection needle and only the radiofrequency (RF) part of the HybridKnife was used for cutting (conventional technique)) or the HybridKnife was used in all the individual stages of the ESD, making use of the HybridKnife’s combined functions (HybridKnife technique). The size of the resected specimens, the operating time, the frequency with which instruments were changed, the number of bleeding episodes, and the number of injuries to the gastric wall together with the subjective overall assessment of the intervention by the operating physician were recorded.

Results

The resected specimens were the same size, with average sizes of 16.96 cm2 and 15.85 cm2 resp (p = 0.8125). Bleeding episodes have been less frequent in the HybridKnife group (2.83 vs. 3.5; p = 0.5625). The standard knife caused more injuries to the lamina muscularis propria (0.17 vs. 1.33; p = 0.0313). The operating times had a tendency to be shorter with the HybridKnife technique (47.18 vs. 58.32 minute; p = 0.0313).

Discussion

The combination of a needle-knife with high-pressure water-jet dissection improved the results of endoscopic submucosal dissection in this experimental setting. Because the frequency of complications is still high, further improvements to the instrument are necessary.

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Authors and Affiliations

  1. Department of Surgery, University Hospital Mannheim, Ruprechts-Karls-Universität, Heidelberg, Germany

    Tobias Lingenfelder, Moritz G. Sold, Stefan Post & Georg F. B. A. Kaehler

  2. Research Department, Erbe Elektromedizin, Tübingen, Germany

    Klaus Fischer & Markus D. Enderle

  3. Section Endoscopy, Surgical Department, University Hospital Mannheim, Theodor-Kutzer-Ufer 1-3, 68167, Mannheim, Germany

    Georg F. B. A. Kaehler

Authors
  1. Tobias Lingenfelder
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  2. Klaus Fischer
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  3. Moritz G. Sold
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  4. Stefan Post
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  5. Markus D. Enderle
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  6. Georg F. B. A. Kaehler
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Corresponding author

Correspondence to Georg F. B. A. Kaehler.

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Lingenfelder, T., Fischer, K., Sold, M.G. et al. Combination of water-jet dissection and needle-knife as a hybrid knife simplifies endoscopic submucosal dissection. Surg Endosc 23, 1531–1535 (2009). https://doi.org/10.1007/s00464-009-0433-3

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  • DOI: https://doi.org/10.1007/s00464-009-0433-3

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