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Sample Collection Method for a Dispenser-Integrated Germ Detection System in the field of Hand Hygiene

  • This bachelor thesis validates a demonstrator that had a sample collection method for a dispenser-integrated germ detection system in the field of hand hygiene. In addition, the temperature of the hand was analysed; this was taken from previous work by T.Mooren. The first task was to validate a different spray nozzle. Eight nozzles were analysed by their spray patterns and ranked. Further experiments were carried out with the highest ranked spray nozzle. Subsequently, an attempt was made to prove whether bacteria could be washed off. This was done with an experimental setup to simulate washing off the palm of the hand, realised in the frame scope of this work. Calibrated glass slides with and without bacteria were used to enable localisation of the same bacterial areas before and after. Afterwards, this procedure was expanded to analyse the behaviour of soap and foam bacteria. The drip tray was changed to obtain a high number of bacteria into the sensing device. An excellent visual representation had to be achieved, so a mini-microscope was used in the demonstrator. This mini-microscope was able to capture and display images of the washed-off bacteria sample generation visually. Different lenses and that securitisation versions were tested for the microscope. Within this, the resolution of the pixels could be improved. Also, the comparison between two different objectives were evaluated. A complete electronic system was then integrated into a disinfection dispenser. This included a Raspberry-Pi and microcontroller for programming and controlling the system. Other components were the mini-microscope, a pump, LED-strips, two-infrared sensors for temperature measurements and an LCD-screen for visualisation. Finally, a fully functional system was presented to the funding agency the VDI/VDE-IT and to the employees of Ophardt Hygiene AG. The system was able to wash bacterial samples from a hand or a slide and display them visually with a microscope; the temperature of the hand was taken too. This 1st demonstrator of the project will be set up soon for Ophardt Hygiene AG employees to test at the building entrance in order to valuate long-term stability and user-friendliness. Data for the further project phases will be collected and determined there.

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Metadaten
Author:Timo Mooren
Examiner:Dirk Bockmühl, Siegfried Steltenkamp
Document Type:Bachelor Thesis
Language:English
Date of Publication (online):2022/02/01
Year of first Publication:2022
Publishing Institution:Hochschule Rhein-Waal
Degree-granting institution:Hochschule Rhein-Waal
Date of final exam:2022/01/19
Release Date:2022/02/01
Tag:Keim Erkennung
Germ detection system
Faculties and Institutes:Fakultät Life Sciences
Dewey Decimal Classification:6 Technik, Medizin, angewandte Wissenschaften / 61 Medizin und Gesundheit
Licence (German):License LogoCC BY 4.0 International - Namensnennung