Needle Electrodes
Needle Electrodes - Related Videos
08:15
Fabrication of Fine Electrodes on the Tip of Hypodermic Needle Using Photoresist Spray Coating and Flexible Photomask for Biomedical Applications
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Cited by 5 •
2017
The fabrication method for fine interdigitated electrodes (gap and width: 20 µm) at the tip of a hypodermic needle (diameter: 720 µm) is demonstrated using a spray coating and flexible film photomask in the photolithography process.
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Intraosseous Needle Placement
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03:02
Standard Electrode Potentials
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2020
On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
07:12
Implanting an Electrode into the Subthalamic Nucleus of a Rat
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2025
The video demonstrates a procedure for implanting an electrode into the subthalamic nucleus of a rat to deliver electrical stimuli.
08:25
Needle Thoracostomy
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2015
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FAQs
The insulated shaft limits electrical interaction along most of the probe, while the exposed conductive tip concentrates contact with nearby tissue. This arrangement helps associate recorded activity or delivered stimulation with a relatively small region rather than the entire shaft path. Consequently, tip placement becomes important for interpreting localized neural responses and for comparing activity across different tissue sites.
Neural activity produces ionic currents in the surrounding biological tissue. At the conductive tip, these local ionic changes are coupled to electronic circuitry, allowing the system to represent nearby electrical activity as a recording. The resulting signal reflects activity close to the probe, so tissue proximity and the quality of electrical contact influence what neural events are detected.
Its conductive tip can transfer electrical information in either direction. During recording, nearby neural currents produce signals that the electrode system measures; during stimulation, controlled electrical pulses pass through the tip into surrounding tissue. These functions answer different experimental questions: recording examines ongoing nervous system activity, whereas stimulation tests how neural tissue responds to an imposed electrical input.
Placement, tissue contact, and electrode impedance are central determinants of signal quality. An unsuitable position may miss the activity of interest, while poor contact can weaken or distort the measured signal. Impedance describes the opposition to electrical signal transfer at the electrode-tissue interface. Together, these factors affect recording reliability and the interpretation of neural responses.
Researchers need to consider the intended measurement location, the position of the exposed tip, tissue contact, and the possibility of biological damage. These considerations balance spatially localized access against the effects of inserting a probe into tissue. Careful placement supports meaningful electrophysiological measurements, whereas inaccurate positioning or excessive injury can complicate results and their interpretation.
They are useful when investigators need localized access to electrical activity or want to test nervous system function with controlled stimulation. Applications include extracellular recording, neural stimulation, electrophysiological mapping, and studies of brain or peripheral nerve function. The resulting measurements or responses can help relate electrical activity to specific tissue locations and evaluate how neural structures behave.