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Related Concept Videos

Directional Relays01:25

Directional Relays

Directional relays, essential for managing unidirectional fault currents, enhance the safety and efficiency of power systems. On power lines equipped with directional relays, faults downstream (to the right) of the current transformer typically cause the fault current to lag the bus voltage by approximately 90 degrees, known as the forward direction. In contrast, upstream (left-side) faults may result in the fault current leading the bus voltage by nearly 90 degrees, termed the reverse...
Schottky Barrier Diode01:27

Schottky Barrier Diode

Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...
Reclosers and Fuses01:26

Reclosers and Fuses

Automatic circuit reclosers enhance the protection of distribution circuits by interrupting and auto-reclosing an AC circuit according to a preset sequence. They effectively manage temporary faults on overhead distribution lines, often caused by tree limbs or wildlife, by briefly disrupting service to improve overall reliability. However, contact with reclosers or energized broken conductors on the ground can pose serious hazards.
A comprehensive protection scheme for radial distribution...
Differential Relays01:20

Differential Relays

Differential relays are used to protect generators, buses, and transformers by comparing electrical quantities at different points. When a fault occurs, the difference in current between the two points triggers the relay to operate, opening the circuit breaker. Under normal conditions, the current entering (i1) and leaving (i2) a generator are equal. When a fault occurs, however, these currents become unequal, and the difference current flows in the relay operating coil, causing the relay to...
Bridge rectifier01:24

Bridge rectifier

The bridge rectifier is essential in electronics for efficiently converting alternating current (AC) to direct current (DC). Comprised of four diodes configured in a bridge layout, this rectifier effectively processes both the positive and negative halves of the AC waveform, making it superior to half-wave and full-wave center-tapped rectifiers in terms of voltage regulation and output stability.
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Bipolar Junction Transistor01:22

Bipolar Junction Transistor

Bipolar Junction Transistors (BJTs) are essential elements in electronic circuits, playing a crucial role in the functionality of amplifiers, memories, and microprocessors. These transistors can be designed as NPN or PNP based on their doping patterns. They consist of three layers: the emitter, base, and collector. The configuration of these layers and their respective doping levels—with N-type or P-type impurities—define the transistor's type and its operational characteristics.
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4D Printed Bifurcated Stents with Kirigami-Inspired Structures
06:52

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Published on: July 25, 2019

Dedicated bifurcation devices.

David G Rizik1, Kevin J Klassen

  • 1Scottsdale Heart Group, Scottsdale Healthcare Hospital, Scottsdale, AZ, USA.

Reviews in Cardiovascular Medicine
|May 25, 2010
PubMed
Summary
This summary is machine-generated.

New dedicated bifurcation devices aim to improve treatment for coronary bifurcation lesions, a common challenge. These devices focus on the side branch ostium, a frequent site of restenosis, showing promise in early studies.

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Area of Science:

  • Interventional Cardiology
  • Cardiovascular Devices
  • Biomaterials

Background:

  • Coronary bifurcation lesions present a significant treatment challenge with no established optimal strategy.
  • The side branch ostium is a common site for restenosis, driving the need for improved interventions.
  • Main branch outcomes are favorable due to advanced techniques and drug-eluting stents.

Purpose of the Study:

  • To review emerging dedicated bifurcation devices for treating coronary bifurcation lesions.
  • To highlight the focus on side branch ostium access and coverage in new device designs.
  • To assess the potential of these novel devices based on early clinical findings.

Main Methods:

  • Review of current literature and company-evaluated dedicated bifurcation devices.
  • Analysis of device concepts, including stent platform (bare metal vs. drug-eluting) and side branch ostium coverage.
  • Examination of early results from single-arm clinical studies evaluating device performance.

Main Results:

  • Dedicated bifurcation devices are being developed with varied designs for side branch access.
  • Both bare metal and drug-eluting iterations of these devices are under investigation.
  • Early single-arm studies suggest promise for these dedicated bifurcation devices.

Conclusions:

  • Dedicated bifurcation devices offer a potential solution for challenging coronary bifurcation lesions.
  • Focusing on the side branch ostium is key to reducing restenosis rates.
  • Further clinical evaluation is warranted to confirm the efficacy and safety of these novel devices.