Document Detail

Comparison of torsional and linear mode ultrasonic coagulating shears for sealing veins.
MedLine Citation:
PMID:  19105669     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Torsional mode ultrasonic coagulating shears are an alternative device to linear mode shears for hemostatic cutting. The aim of this study was to compare the vessel-sealing quality of torsional and linear mode ultrasonic coagulating shears on human veins. MATERIALS AND METHODS: Veins were harvested from 15 patients during varicose vein surgery. Each vessel was sealed and cut by both devices at different sites. The seals were either tested for burst pressure or examined microscopically to compare mural thickness, seal length, and extent of coagulation and lateral thermal effect. RESULTS: For veins 2.0-3.0 mm in diameter, the median burst pressure was higher on seals made with torsional mode shears (245, IQR 161-360 mm Hg vs. 133, IQR 101-165 mm Hg; P = 0.001). Similarly, for veins 3.5-4.5 mm in diameter, the median burst pressure was higher with torsional mode shears (149, IQR 118-212 mm Hg vs. 94, IQR 82-126 mm Hg; P = 0.001). There was no significant difference in the median burst pressure for veins 5.0-6.0 mm in diameter (82, IQR 61-132 mm Hg vs. 76, IQR 40-114 mm Hg; P = 0.268). Seals made with torsional mode shears showed significantly greater seal length (517 +/- 300 microm vs. 316 +/- 147 microm; P = 0.016), more tissue coagulation (467 +/- 197 microm vs. 335 +/- 128 microm; P = 0.015), and greater lateral thermal effect (1479 +/- 340 microm vs. 1116 +/- 253 mum; P < 0.001). CONCLUSION: Torsional mode ultrasonic shears produced more secure seals on veins up to 4.5 mm in diameter. This can be explained by the greater seal length produced by torsional mode shears.
Siok Siong Ching; Caroline S Verbeke; Shervanthi Homer-Vanniasinkam; Michael J McMahon
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Journal of laparoendoscopic & advanced surgical techniques. Part A     Volume:  18     ISSN:  1092-6429     ISO Abbreviation:  J Laparoendosc Adv Surg Tech A     Publication Date:  2008 Dec 
Date Detail:
Created Date:  2008-12-24     Completed Date:  2009-03-31     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9706293     Medline TA:  J Laparoendosc Adv Surg Tech A     Country:  United States    
Other Details:
Languages:  eng     Pagination:  819-24     Citation Subset:  IM    
Academic Unit of Surgery, The General Infirmary at Leeds, Leeds, United Kingdom.
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MeSH Terms
Chi-Square Distribution
Electrocoagulation / instrumentation*
Equipment Design
Equipment Safety
Hemostasis, Endoscopic / instrumentation*
Statistics, Nonparametric
Surgical Instruments
Tensile Strength
Ultrasonic Therapy / instrumentation*
Varicose Veins / surgery*
Vascular Surgical Procedures / instrumentation

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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