Fully automatic microfiltration system

Para qué sirve

A fully automatic system replaces manual urine filtration with reusable filters, integrated sterilization, and simple operation. It saves material and time, requires no specially trained personnel, and improves hygiene in diagnostics.

Qué te inspiró

The idea arose from observing how much time, material, and human resources are tied up in manual urine filtration in everyday laboratory work, especially when sample volumes are high. An early mock-up proved that the underlying principle was technically feasible. This led to my goal of creating a practical, automated, and sustainable solution. I was inspired by the opportunity to apply my knowledge of design, mechatronics, and electronics in a targeted manner to create real relief for medical staff and a hygienically safe alternative.

Cómo funciona

The system automates the previously manual process of microfiltration of urine samples using an integrated, self-regulating flow module. At the heart of the system is a guided filter membrane, which is pulled off a roll, passed through a sealed filtration chamber, and rewound after use. The filtration process is carried out by pressing the membrane in a targeted manner using a toggle lever mechanism, which ensures a high-precision seal. Once the filtration cycle is complete, the system automatically activates a multi-stage cleaning unit, which rinses the components exposed to liquid with hydrogen peroxide and then dries them. All functions, from motor drive and valve control to sterilization, are coordinated by a microcontroller. A touch display enables interaction with the system, with operating parameters being displayed and accessible by an intuitive interface. The system thus ensures reproducible, contamination-free filtration with minimal operating effort.

Proceso de diseño

The design process began with a concept based on a working mock-up that simulated the manual filtration. The goal was to fully automate this process and optimize it for hygiene. I started by creating initial 3D models to test the basic mechanical principle, particularly the filter transport and sealing. The first prototype featured a two-part sealing system with several moving elements, but proved too complex and prone to errors. Tests showed that manufacturing tolerances were compromising the sealing. The concept was then greatly simplified: the second sealing level was eliminated in favor of a metal-to-metal seal in combination with a flexible outer seal. At the same time, I developed my own dead-space-free valves, as commercially available components didn't meet the hygienic requirements. The mechanics and electronics were iteratively adapted. Initially, the system was controlled via a Raspberry Pi, but this was replaced by an Arduino Mega due to real-time requirements. The user interface was also revised several times and finally implemented as a touch display with symbol control. Today, the system consists of a stable, modular device with precise filter guidance, reliable sealing, intelligent sequence control, and integrated sterilization. tested, optimized & ready for use.

Qué lo hace diferente

The project stands out thanks to its combination of complete automation, re-usability, and a hygienically closed system. Unlike other solutions on the market, it does not use disposable cartridges, but instead employs a continuous filter belt system. The entire process—from filtration to sterilization—runs automatically without any intervention from staff. Particularly noteworthy is the specially developed, dead-space-free valve system, which is unique in this form. It was designed specifically for the highest hygiene standards and enables residue-free rinsing of all fluid-carrying components. Operation is via a touch display with intuitive symbols and is designed for medical personnel without prior technical knowledge. The system thus combines process reliability, sustainability, and ease of use in a single, compact device.

Planes para el futuro

The next step is to test and document the prototype in a real laboratory environment. At the same time, I plan to apply for a patent for the valve system and expand the system to include additional medical sample types such as blood, saliva, and swabs. In addition, the system will be specifically prepared for use in fully automated laboratories. Once the prototype phase is complete, a design review is planned with the aim of reducing the device volume to around a quarter of its current size in order to further optimize space requirements and integration into existing systems.

Premios

The project work was graded 1 by the Munich Technical College and successfully competed against numerous entries from across Germany in the BVT Award 2025, where it took second place.