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Related Concept Videos

Assessment of blood pressure in brachial artery(one-step method)01:15

Assessment of blood pressure in brachial artery(one-step method)

This procedural guide systematically measures blood pressure using an oscillometric digital sphygmomanometer, emphasizing accuracy, patient safety, and comfort.
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Assessment of blood pressure in brachial artery(two-step method)01:23

Assessment of blood pressure in brachial artery(two-step method)

Measuring blood pressure is a fundamental skill in healthcare that aids in diagnosing and monitoring hypertension and other cardiovascular conditions. An aneroid sphygmomanometer, commonly used in clinical settings, offers a manual and precise method for blood pressure measurement. The technique for using this instrument involves specific steps that must be carefully executed to ensure accuracy. The following detailed description outlines a two-step technique for assessing blood pressure using...
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Assessing blood pressure is a standard procedure executed in virtually all medical environments. The method utilized today was established over a hundred years ago by an innovative Russian doctor, Dr. Nikolai Korotkoff. The soft ticking noise, known as Korotkoff sounds, heard while taking blood pressure readings results from turbulent blood flow within the vessels. The apparatus required for this procedure includes a sphygmomanometer, a blood pressure cuff attached to a gauge, and a stethoscope.
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Fluid pressure is commonly measured using devices called manometers, which rely on liquid columns to indicate pressure differences. The height of a liquid column in a manometer reflects the pressure exerted by the fluid, providing a simple yet effective means of measurement. Different types of manometers serve specific purposes based on their configurations and the type of fluids involved.
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Measuring electro-adhesion pressure before and after contact.

Sylvain Schaller1, Herbert Shea2

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Electro-adhesion (EA) offers tunable, reversible adhesion for various objects. This study introduces a method to compare pre-contact attachment and post-contact detachment forces, revealing insights into EA mechanisms.

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Area of Science:

  • Materials Science
  • Physics
  • Engineering

Background:

  • Electro-adhesion (EA) is an electrically controlled adhesion method known for low power consumption, tunability, speed, and reversibility.
  • EA is effective on both conductive and insulating surfaces, but typically only detachment forces are measured.
  • Understanding both attachment and detachment forces is crucial for optimizing EA applications.

Purpose of the Study:

  • To develop and present a method for comparing pre-contact electro-adhesive attachment forces with post-contact detachment forces.
  • To investigate the influence of surface forces, charge injection, and polarization inertia on EA.
  • To characterize the time-dependence of EA forces under different voltage waveforms (AC vs. DC).

Main Methods:

  • A novel methodology was employed to measure both pre-contact attachment and post-contact detachment forces of electro-adhesion.
  • Experiments were conducted on conductive and insulating objects using over 100 different electro-adhesive patches with varying electrode dimensions.
  • The time-dependence of forces was characterized as a function of applied voltage waveforms, including AC and DC drives.

Main Results:

  • Pre-contact pressures were found to be 1 to 100 times lower than post-contact detachment pressures.
  • AC voltage waveforms enabled significantly faster release times compared to DC operation.
  • At 400 V, release pressures for conductive objects ranged from 1 to 100 kPa, and for dielectric objects, release pressures were 1 to 100 times higher than pre-contact adhesion pressures.

Conclusions:

  • The presented methodology allows for a comprehensive characterization of electro-adhesion, encompassing both attachment and detachment.
  • Surface forces, charge injection, and polarization inertia play significant roles in electro-adhesion dynamics.
  • The findings facilitate standardized electro-adhesion characterization and optimization for diverse applications.