Impact of the Shape of the Needle Tip on the Efficacy of Flushing Implantable Port Chambers

Guiffant, G.; Dupont, Christian; Merckx, Jacques

doi:10.5301/jva.5000593

Cited by 1 publication

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“…These values yield a Reynolds number, associated with the flow along a rough surface, of

{Re}_{normalk} = \frac{{normalk}_{normals} U}{ν}

, where k s is the dimension of the bump (k s =2×10 −5 m), ν≈10 −6 m 2 /s is the viscosity of the flushing fluid (normal saline), and U≈0.5 m/s is the velocity in the vicinity of the Port’s base. In clinical situations, this velocity is associated with mean input flows ranging from 0.2 to 1 mL/s 15. The retained parameters lead to Re k ≈10.…”

Section: Resultsmentioning

confidence: 99%

Mechanical characteristics of plastic base Ports and impact on flushing efficacy

Guiffant

Flaud

Royon

et al. 2017

MDER

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BackgroundThree types of totally implantable venous access devices, Ports, are currently in use: titanium, plastic (polyoxymethylene, POM), and mixed (titanium base with a POM shell). Physics theory suggests that the interaction between a non-coring needle (NCN, made of stainless steel) and a plastic base would lead to the stronger material (steel) altering the more malleable material (plastic).ObjectivesTo investigate whether needle impacts can alter a plastic base’s surface, thus potentially reducing flushing efficacy.Study design and methodsA Port made of POM was punctured 200 times with a 19-gauge NCN. Following the existing guidelines, the needle tip pricked the base with each puncture. The Port’s base was then examined using a two-dimensional optical instrument, and a bi-dimensional numerical simulation using COMSOL® was performed to investigate potential surface irregularities and their impact on fluid flow.ResultsEach needle impact created a hole (mean depth, 0.12 mm) with a small bump beside it (mean height, 0.02 mm) the Reynolds number Rek≈10. A numerical simulation of the one hole/bump set showed that the flushing efficacy was 60% that of flushing along a flat surface.DiscussionIn clinical practice, the number of times a Port is punctured depends on patient and treatment characteristics, but each needle impact on the plastic base may increase the risk of decreased flushing effectiveness. Therefore, the more a plastic Port is accessed, the greater the risk of microorganisms, blood products, and medication accumulation.ConclusionsMultiple needle impacts created an irregular surface on the Port’s base, which decreased flushing efficacy. Clinical investigation is needed to determine whether plastic base Ports are associated with an increased risk of Port infection and occlusion compared to titanium base Ports.

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“…These values yield a Reynolds number, associated with the flow along a rough surface, of

{Re}_{normalk} = \frac{{normalk}_{normals} U}{ν}

Section: Resultsmentioning

confidence: 99%

Mechanical characteristics of plastic base Ports and impact on flushing efficacy

Guiffant

Flaud

Royon

et al. 2017

MDER

Self Cite

View full text Add to dashboard Cite

show abstract

Impact of the Shape of the Needle Tip on the Efficacy of Flushing Implantable Port Chambers

Cited by 1 publication

References 12 publications

Mechanical characteristics of plastic base Ports and impact on flushing efficacy

Mechanical characteristics of plastic base Ports and impact on flushing efficacy

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