Adjustable antisiphon shunt.

S Sood; A I Canady; S D Ham

doi:10.1007/s003810050383

Home/Archive/PubMed

PubMed · 10392496

Adjustable antisiphon shunt.

S Sood·A I Canady·S D Ham

View original source ↗Export metadata ↓

Abstract

Overdrainage from siphoning, a result of negative distal pressure, has been a major problem with the existing differential pressure shunt devices. The antisiphon/siphon control devices used to reduce siphoning often malfunction owing to fibrous scar formation around the valve. Similarly, the functioning of gravity-actuated systems is adversely affected by body movements. Constant flow shunt systems may not be superior to existing differential pressure valves, as has been shown in a recent multicenter study. In view of these difficulties, we investigated the possibility of developing a shunt valve based on the Starling resistor concept of flow regulation that allows proximal pressure-dependent and distal pressure-independent flow. The valve designed is capable of proximal pressure-dependent and distal pressure-independent flow. The valve allows for adjustable negative pressure in the vertical position.

Explore related subjects

Cerebrospinal Fluid Shunts Compliance Drainage Equipment Design Humans Hydrocephalus Pressure Rheology Journal Article

Keep this discovery

Explore connections, maps & timelines

BibTeX RIS

S Sood, A I Canady, S D Ham. 1999. Adjustable antisiphon shunt.. https://doi.org/10.1007/s003810050383

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related citations

PubMed2001

[Normal pressure hydrocephalus--from clinical picture to diagnosis. Help by early shunt placement].

Normal pressure hydrocephalus (NPH), which may either be idiopathic or occur secondarily, is responsible for approximately 6% of the cases of dementional syndromes in the elderly. Although its diagnosis still remains a problem, every attempt should be made to identify patients with clinical symptoms arising from NPH, since the placement of a shunt can result in a much improved quality of life. Candidates for surgical treatment must be selected with care, since the transient peri-operative morbidity may be as high as 7%.

Cerebrospinal Fluid Shunts↗

PubMed2001

Hypertrophic chronic pachymeningitis as a localized immune process in the craniocervical region.

Hypertrophic chronic pachymeningitis (HCP) is a rare disorder that causes intracranial or spinal thickening of the dura mater. This report describes a patient with progressive HCP in the craniocervical region associated with signs of rheumatic disease. A ventricular-atrial shunt had to be inserted because of increased intracranial pressure. The patient improved after suboccipital craniotomy, C1 to C6 laminectomy, and removal of the thickened dura. Additional therapy with methotrexate stopped progression, which was documented by MRI and PET.

Cerebrospinal Fluid Shunts↗

PubMed2001

Hydrocephalus and epilepsy.

Since the introduction of ventriculo-atrial and/or ventriculo-peritoneal shunting for hydrocephalic patients, controversies have developed regarding the likelihood of epileptic seizures developing as a result of the shunting itself and/or its complications. On the other hand, hydrocephalus is not commonly recognized as a cause of seizures in general, although epilepsy is reported to be frequently associated with shunt-treated hydrocephalus, especially in children. Several authors have reported an increased risk of epileptic seizures after shunt placement, but the underlying mechanisms are still controversial. The insult to the brain at the time of ventricular catheter insertion, the presence of the shunt tube itself as a foreign body, the burr hole location, the number of shunt revisions after malfunction, associated infection, the etiology of hydrocephalus, and associated mental retardation are thought to be related to the risk of epilepsy. Age at the time of initial shunt placement also seems to be an important factor. Early shunting is a well-known determinant of risk in shunt obstruction, and children less than 2 years old are consequently at a higher risk of developing epilepsy than older ones. It is reported that antiepileptic drug treatment is not so reliable as might be expected. Conscientious and more sophisticated EEG recording in those children may be beneficial during follow-up. The incidence of seizures in shunted children is reported to be quite high, ranging from 20% to approximately 50%, so that neurosurgeons should pay more attention to the issue of epilepsy in hydrocephalic children. Although ventriculo-extracranial shunts have been the standard treatment for hydrocephalus for decades, the long-term morbidity, including postshunt epileptic seizures, has to be taken seriously. The use of neuroendoscopic techniques when indicated may ameliorate this problem a great deal in the future.

Cerebrospinal Fluid Shunts↗