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Open and closed-loop control systems01:17

Open and closed-loop control systems

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Control systems are foundational elements in automation and engineering. They are broadly categorized into open-loop and closed-loop systems. These classifications hinge on the presence or absence of feedback mechanisms, significantly influencing the system's performance, complexity, and application.
An open-loop control system operates without feedback from the output. It consists of two primary elements: the controller and the controlled process. The controller receives an input signal...
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Updated: Sep 17, 2025

Author Spotlight: Therapeutic Benefit of Closed-Loop Deep Brain Stimulation in Depression Treatment
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Multifunctional Biomedical Devices with Closed-Loop Systems for Precision Therapy.

Yixuan Leng1, Rujie Sun2

  • 1Department of Engineering Science, Institute of Biomedical Engineering (IBME), University of Oxford, Oxford, OX3 7DQ, UK.

Advanced Healthcare Materials
|June 30, 2025
PubMed
Summary
This summary is machine-generated.

Closed-loop control systems enhance precision therapy by integrating real-time monitoring and automated treatment adjustments. These adaptable systems improve treatment effectiveness and safety for chronic diseases and neurostimulation.

Keywords:
bioelectronicsbiomaterialsclosed‐loopdrug deliverystimuli‐responsive

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Control Systems

Background:

  • Precision therapy demands real-time patient monitoring and adaptive treatment adjustments.
  • Current limitations in treatment accuracy and safety necessitate advanced control strategies.
  • Closed-loop systems offer a paradigm shift by integrating sensing and therapeutic interventions.

Purpose of the Study:

  • To review and categorize closed-loop control systems for precision therapy.
  • To examine the mechanisms and materials underlying self-sustained and externally triggered systems.
  • To highlight innovations in bioelectronics, biosensing, and control algorithms for closed-loop applications.

Main Methods:

  • Categorization of closed-loop devices into self-sustained and externally triggered types.
  • Review of stimuli-responsive materials and autonomous drug delivery for self-sustained systems.
  • Analysis of integrated bioelectronics, biosensing, and control algorithms for externally triggered systems.

Main Results:

  • Self-sustained systems autonomously deliver therapies via stimuli-responsive materials, ideal for chronic disease management.
  • Externally triggered systems leverage integrated bioelectronics for advanced biosensing and personalized therapeutic strategies.
  • Data-driven control algorithms are crucial for optimizing treatment personalization and effectiveness.

Conclusions:

  • Closed-loop systems significantly enhance accuracy, adaptability, and effectiveness in precision therapy.
  • These systems mitigate risks of over- or under-treatment, improving patient outcomes.
  • Future research in closed-loop systems holds transformative potential for conditions like diabetes and neurological disorders.