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Household Wiring And Electrical Safety01:13

Household Wiring And Electrical Safety

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Companies that supply power to most modern households use three conductors, typically called a three-wire line. While one is neutral, the other two are both at 120 V but with opposite polarity, giving a voltage of 240 V between them. With a three-wire line, high-power appliances that require 240 V, such as electric stoves and clothes dryers, are linked between the two hot lines. 120 V appliances can be connected between the neutral and either of the hot lines. The neutral side, which is always...
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Magnetic Field Due To A Thin Straight Wire01:28

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Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
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Magnetic Field Due to Two Straight Wires01:18

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Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
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Magnetic Force On Current-Carrying Wires: Example01:22

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In a magnetic field, moving charges encounter a force. If a wire contains these moving charges, i.e., if the wire is carrying a current, then a force acts on the wire as well. Consider a pair of flexible leads holding a wire that is 40 cm long and 10 g in weight in a horizontal position. The wire is placed in a constant magnetic field of 0.40 T, as shown in Figure 1(a). Determine the magnitude and direction of the current flowing in the wire needed to remove the tension in the supporting leads.
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Simplified Synchronous Machine Model01:30

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The Synchronous Machine Model is a fundamental tool in analyzing and ensuring the transient stability of power systems. This model simplifies the representation of a synchronous machine under balanced three-phase positive-sequence conditions, assuming constant excitation and ignoring losses and saturation. The model is pivotal for understanding the behavior of synchronous generators connected to a power grid, particularly during transient events.
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Diode: Reverse bias01:14

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A diode is reverse-biased when the positive terminal of an external voltage source is connected to the n-type material and the negative terminal to the p-type material. This configuration opposes the natural direction of current flow through the diode, effectively increasing the width of the depletion region and the barrier potential. The reverse bias condition produces a minimal leakage current, primarily due to minority charge carriers. This leakage becomes significant when the reverse...
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Related Experiment Video

Updated: Jan 20, 2026

Magnetically-Assisted Remote Controlled Microcatheter Tip Deflection under Magnetic Resonance Imaging
11:27

Magnetically-Assisted Remote Controlled Microcatheter Tip Deflection under Magnetic Resonance Imaging

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A simplified reverse wire technique using an angulated supercross microcatheter.

Yu Ho Chan1, Victor Yue Hong Cheng1, Chi Wing Wong1

  • 1Division of Cardiology, Department of Medicine and Geriatrics, Pok Oi Hospital, New Territories, Hong Kong.

Catheterization and Cardiovascular Interventions : Official Journal of the Society for Cardiac Angiography & Interventions
|August 24, 2019
PubMed
Summary
This summary is machine-generated.

Wiring extremely angulated side branches in coronary interventions is challenging. A simplified reverse wire technique using a specialized microcatheter offers a feasible solution without needing a double-lumen catheter.

Keywords:
coronary artery diseaseoptical coherence tomographypercutaneous coronary intervention

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Area of Science:

  • Interventional Cardiology
  • Medical Device Technology

Background:

  • Bifurcation lesions with highly angulated side branches pose significant challenges in coronary interventions.
  • The traditional reverse wire technique, while effective, often requires a double-lumen catheter, adding complexity.

Observation:

  • A novel approach utilizing a specialized angle tip microcatheter (Supercross microcatheter™) has been developed.
  • This technique simplifies the reverse wire procedure for accessing difficult side branches.

Findings:

  • The simplified reverse wire technique with the angle tip microcatheter facilitates wiring of extreme angulated side branches.
  • This method proves to be a simple and feasible alternative, eliminating the need for a double-lumen catheter.

Implications:

  • This innovation offers a more accessible and straightforward method for interventional cardiologists treating complex coronary bifurcation lesions.
  • The specialized microcatheter may improve procedural success rates and reduce complications associated with challenging side branch access.