shunt

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shunt

1. a railway point
2. Electronics a low-resistance conductor connected in parallel across a device, circuit, or part of a circuit to provide an alternative path for a known fraction of the current
3. Med a channel that bypasses the normal circulation of the blood: a congenital abnormality or surgically induced
4. Brit informal a collision which occurs when a vehicle runs into the back of the vehicle in front

Shunt

 

an electrical or magnetic conductor connected in parallel with an electric or magnetic circuit to divert part of the electric current or magnetic flux when it is undesirable or impossible to pass all the current or flux through the circuit. For example, when a shunt is used to extend the measuring range of an ammeter, the current Ix being measured is divided between the shunt and the ammeter in inverse proportion to their respective resistances, Rs and RA; in this case Ix = IA (1 + RA/RS) = IAks, where IA is the value of the current as determined from the ammeter readings and ks is the shunting factor. For convenience in making current measurements, the resistance of the shunt is chosen so that ks is equal to 10,100, or 1000.

Shunts are manufactured in the form of plates, bands, and wires, primarily of manganin or constantan (for electrical shunts) or of a soft magnetic material (for magnetic shunts).

shunt

[shənt]
(civil engineering)
To shove or turn off to one side, as a car or train from one track to another.
(electricity)
A precision low-value resistor placed across the terminals of an ammeter to increase its range by allowing a known fraction of the circuit current to go around the meter. Also known as electric shunt.
To place one part in parallel with another.
(electromagnetism)
A piece of iron that provides a parallel path for magnetic flux around an air gap in a magnetic circuit.
(medicine)
A vascular passage by which blood is diverted from its normal circulatory path; frequently it is a surgical passage created between two blood vessels, but it may also be an anatomical feature.

shunt

To divert, switch or bypass.
References in periodicals archive ?
Hence, myelomeningocele sac should also be repaired as early as possible and shunts should be inserted approximately 7 days after the closure of myelomeningocele sac.
Since its inception in 1986, Deltec has been a manufacturer of DC ammeter shunts, available in ten different sizes, as well as fuse blocks.
The goal of the paper is the development and creation at the Research & Design Institute <<Molniya>> of the NTU <<KhPI>> of a coaxial disk shunt of the IIIK-300M2 type which makes it possible to reliably measure the ATP of current pulses of artificial lightning in wide amplitude and time ranges with an action integral up to 15 x [10.
Background: Balanced adjustment of the portal vein shunt volume during a transjugular intrahepatic portosystemic shunt (TIPS) is critical for maintaining liver perfusion and decreasing the incidence of liver insufficiency.
In feline cases of liver shunts, veterinarians often recommend a change to a low-protein therapeutic diet in addition to medication.
As was mentioned above, intracoronary shunts ensure a good visualization in the place where distal anastomoses are applied, improve blood flow in the bypassed arteries, and prevent myocardial ischemia.
In recent military campaigns in Iraq and Afghanistan, role of temporary vascular shunt has been highlighted as a measure to gain time and as a damage control entity.
On the other hand, only 35 % achieved long-term control without CSF shunts in patients presented with tense fontanels and rapidly progressed hydrocephalus and the authors suggested that the main indication for CPC was mildly progressive communicating hydrocephalus in infants.
6) Sometimes the shunts are detected as a result of encephalopathy or hyperammonemia.
Usually, shunts are selected or designed to operate at a maximum continuous current of 2/3 rated current.
Ventriculoperitoneal (VP) shunts are the mainstay of treatment for hydrocephalus which makes their complications an important avenue for discussion.