Evaluating the diameter of eyedropper tips using a computer vision system

Machado, Edicley Vander; Cristovam, Priscila Cardoso; Freitas, Denise de; Gomes, José Álvaro Pereira; Santos, Vagner Rogério dos

doi:10.5935/0004-2749.20190010

Cited by 2 publications

(2 citation statements)

References 15 publications

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“…The flange part of the drip chamber was machined with a lathe so that it was perpendicular to the center axis of the drip nozzle. The outer diameter and inner diameter of the tip of the drip nozzle were measured using a computer vision system PC-VJ14MEXOW (SAITOH KOUGAKU) [17]. Before the experiment, it was visually confirmed with a stereomicroscope that the lip part of the drip nozzle had no deformations or scratches.…”

Section: Drip Nozzle Used In the Experimentsmentioning

confidence: 99%

A study on the change of droplet volume by the increase of flow rate

Horiuchi

2020

SN Appl. Sci.

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Drip-control type infusion pumps cause a flow rate error when the volume of the droplet dropping in the drip chamber changes. Therefore, the purpose of this study is to accurately measure the volume of one droplet as the flow rate increases. For measurement of droplet volume, a droplet bypassing device was prototyped. In the case of a 20 drop/mL drip nozzle, a volume error of + 7.6% occurred at a flow rate of 500 mL/min, compared to the theoretical volume of 50.0 mm 3. In the case of a 60 drop/mL drip nozzle, a volume error of − 17.4% occurred at a flow rate of 300 mL/min, compared to the theoretical volume of 16.7 mm 3. Moreover, the standard deviation of the measured value of the droplet volume increased as the flow rate increased. It was shown that even with proper use of the infusion set, significant flow rate errors can occur depending on the flow rate settings. Therefore, it is considered that the drip-control type infusion pump needs to be controlled by correcting the volume change due to the increase in the flow rate.

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Section: Drip Nozzle Used In the Experimentsmentioning

confidence: 99%

A study on the change of droplet volume by the increase of flow rate

Horiuchi

2020

SN Appl. Sci.

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“…Dropper-type infusion systems have already been the subject of several studies [13,14], which evaluated the same drug but with drippers from different manufacturing companies. They concluded that over-and under-dosing problems can occur, and suggest the standardization of drippers, as it is identified as one of the main cul-prits for the identified problems.…”

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confidence: 99%

Dropper Systems: A Short Review of Experimental and CFD Simulation Studies

2023

PSBJ

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Dropper-type dosing systems are responsible for most everyday applications, such as intermittent doses and eye drops, in addition to the preparation of solutions in scientific circles. However, careful evaluation of physical influences such as viscosity, surface tension, temperature, pressure and density related to a dosage it is not taken into account in the leaflets or tables of the drops/mL ratio. The present work presents a review of the available literature to identify and understand the factors present in this type of measurement, as well as the methods and analyzes normally used according to the Pharmacopoeia. Furthermore, in this work it is proposed the use of Computational Fluid Dynamics (CFD) to model and simulate this flow problem in order to predict the dripping phenomenon as a function of the physical conditions of the system. For that, researcher was made on the following topics: drip and dosage-related issues, CFD applied to dosing systems and data collection necessary for modeling and solving of the studied system. It was identified a deficiency in the standardization of dropper instruments. Data of physical characteristics of fluids that can be dosed in droppers were collected. The proposal to use CFD for the simulation and analysis of these cases is valid and used by several works related to laminar flows and the presence of drops.

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Evaluating the diameter of eyedropper tips using a computer vision system

Cited by 2 publications

References 15 publications

A study on the change of droplet volume by the increase of flow rate

A study on the change of droplet volume by the increase of flow rate

Dropper Systems: A Short Review of Experimental and CFD Simulation Studies

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