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Related Concept Videos

Passive Filters01:27

Passive Filters

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Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
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Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
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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.
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Animal organs and organ systems constantly adjust to internal and external changes through a process called homeostasis ("steady state"). Examples of these changes include regulation of the level of glucose or calcium in the blood or internal responses to external temperatures. Homeostasis requires  maintaining an internal dynamic equilibrium:
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Related Experiment Video

Updated: Jan 25, 2026

Novel Triple-Loop Technique for Suturing TFCC Injuries without Transosseous Tunnel
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Guidewire Loop Dissection Technique for Filter Strut Endothelialization.

Chenyang Qiu1, Yangyan He1, Yilang Xiang1

  • 1Department of Vascular Surgery, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, People's Republic of China.

Annals of Vascular Surgery
|May 11, 2019
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Summary
This summary is machine-generated.

A novel guidewire loop dissection technique simplifies complex inferior vena cava (IVC) filter retrieval. This method effectively addresses endothelialized filter struts without requiring additional equipment, ensuring safe removal.

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Area of Science:

  • Vascular surgery
  • Interventional radiology
  • Medical device retrieval

Background:

  • Complex retrieval of inferior vena cava (IVC) filters presents challenges, particularly when filter struts become endothelialized without tilting.
  • Existing advanced techniques often require specialized equipment.

Observation:

  • A 53-year-old male patient had an IVC filter in place for 8 months.
  • Venogram revealed no filter tilt but significant strut endothelialization.
  • Standard snare retrieval of the filter hook was unsuccessful.

Findings:

  • A guidewire loop dissection technique was employed, utilizing a fine guidewire to create a loop between the filter strut and the caval wall.
  • Traction on the guidewire loop effectively dissected the endothelialized struts from the caval wall.
  • The IVC filter was successfully retrieved without causing injury to the inferior vena cava.

Implications:

  • The guidewire loop dissection technique offers a feasible, equipment-light solution for challenging IVC filter retrievals.
  • This method can potentially reduce procedural complexity and risk in filter retrieval interventions.
  • Further studies may validate this technique for broader clinical application in vascular interventions.