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Selected Publication:

Type of publication: Journal Article
Type of document: Full Paper

Year: 2017

Authors: Schramel, JP; Kindslehner, A; Bockstahler, BA; Dupré, GP

Title: Comparison of design features and mechanical properties of commercially available Veress needles.

Source: Vet Surg. 2017; 46(7):994-1001

Authors Vetmeduni Vienna:

Bockstahler Barbara
Dupré Gilles
Kindslehner Angelika
Schramel Johannes

Vetmed Research Units
University Equine Clinic, Clinical Unit of Equine Internal Medicine
University Clinic for Small Animals, Clinical Unit of Small Animal Surgery

To compare design features and mechanical properties of 13 commercially available Veress needles (VN).In vitro biomechanical study.Veress needles from 9 manufacturers (6 reusable, 6 disposable, and 1 with a reusable stylet combined with a disposable cannula) were included in the study.Veress needles are designed with a spring-loaded stylet to protect the tip of the cannula following insertion into the abdomen. Stylet forces were measured with a scale in a test jig by moving the stylet in 0.5 mm steps into the hollow cannula. Forces and spring rates were derived from force-displacement plots. Mass, mechanical dimensions, and the bevel angle and geometry were assessed. Differences between VN models were analyzed with a univariate analysis of variance. Results are reported as mean ± SD or median (range).Physical and mechanical parameters differed between models. The exposed stylet length was 3.5 mm (2-7). Three bevel geometries (bias, lancet type, and back-cut) with angles between 20° and 40° were identified. Reusable VN weigh more (24.9 ± 2.2 g) than disposable designs (6.0 ± 2.3 g). The mean values for the spring rate and the residual stylet force were 0.23 ± 0.08 Nmm-1 and 0.94 ± 0.28 N, respectively. The mean force required to move the stylet to the cannula tip was 1.81 ± 0.29 N and 2.77 ± 0.54 N to move to the proximal end of the bevel.Commercially available VN use diverse bevel geometries and have different mechanical characteristics. Studies investigating laparoscopic entry complications should explicitly report the type of VN model used.© 2017 The American College of Veterinary Surgeons.

Keywords Pubmed: Animals
Equipment Design
Equipment Failure Analysis
Materials Testing
Mechanical Phenomena
Surgery, Veterinaryinstrumentation

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