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Related Concept Videos

Gas Chromatography: Sample Injection Systems01:08

Gas Chromatography: Sample Injection Systems

In gas chromatography, the sample is introduced as a vapor plug into the carrier gas stream for high efficiency and resolution. A microsyringe injects the sample solution into a heated sample port, vaporizing it and mixing it with the carrier gas. This process is important to ensure the sample is properly prepared for analysis. Thermally sensitive samples can be injected directly into the column and volatilized by slowly increasing the column temperature.
Two primary injection methods are used...

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Lipid Bilayer Vesicle Generation Using Microfluidic Jetting
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Liquid-Driven Microinjection System for Precise Fundus Injection.

Shiyu Xu1,2, Bo Hu1,2, Rongxin Liu1,2

  • 1National Key Laboratory of Intelligent Tracking and Forecasting for Infectious Diseases, Engineering Research Center of Trusted Behavior Intelligence, Ministry of Education, Tianjin Key Laboratory of Intelligent Robotics, Institute of Robotics and Automatic Information System, Nankai University, Tianjin 300350, China.

Sensors (Basel, Switzerland)
|April 13, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a novel liquid-driven microinjection system for precise fundus injections, improving safety for retinal disorder treatments by controlling drug flow rates and reducing tissue damage.

Keywords:
PID-SMCfundus injectionmicrofluidicsmicroinjection system

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Control Systems

Background:

  • Microinjection is crucial for treating retinal disorders like vein cannulation and hemorrhage.
  • Current vitrectomy systems offer uncontrollable, fixed-pressure injections, risking fundus tissue damage.
  • Lack of feedback in existing methods leads to unpredictable drug delivery.

Purpose of the Study:

  • To design and develop a liquid-driven microinjection system for precise fundus injections.
  • To implement a PID sliding mode control (SMC) method for accurate drug delivery.
  • To mitigate risks associated with high flow rates during fundus injections.

Main Methods:

  • Development of a novel liquid-driven microinjection system incorporating a flow sensor.
  • Application of a Proportional-Integral-Derivative (PID) sliding mode control (SMC) algorithm.
  • Validation through fundus simulation injection experiments.

Main Results:

  • The developed microinjection system demonstrated precise control over liquid delivery.
  • The PID-SMC method ensured accurate and stable injection parameters.
  • Simulations confirmed the system's ability to meet fundus injection requirements.

Conclusions:

  • The new microinjection system offers a safer and more controlled approach for fundus injections.
  • The system effectively reduces the impact on delicate fundus tissues.
  • This technology has the potential to improve treatment outcomes for various retinal conditions.