Household magnets can change the programmable shunt valve in hydrocephalus patients

Sheng Liu, Richard Greene, Gordon A. Thomas, Joseph R. Madsen

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations


We found that external household magnets can change the pressure settings of programmable shunt valves. We compare two popular, adjustable, shunt valves used to regulate the cerebral-spinal fluid (CSF) of hydrocephalus patients: the Codman®Hakim™ Programmable Valve (CHPV), and the PS Medical®STRATA™ Valve. We measured the threshold magnetic fields required to change the settings of these two valves at different initial settings. Both types were susceptible to setting changes, with the actual threshold magnetic field strength needed depending on the valve setting and also having some valve variability. The magnetic fields required to increase the valve settings were similar for the two valves, but the fields required for reducing the settings were lower for the STRATA valve than for the CHPV.

Original languageEnglish (US)
Article number1.3.3
Pages (from-to)22-23
Number of pages2
JournalProceedings of the IEEE Annual Northeast Bioengineering Conference, NEBEC
StatePublished - 2005
EventProceedings of the 2005 IEEE 31st Annual Northeast Bioengineering Conference - Hoboken, NJ, United States
Duration: Apr 2 2005Apr 3 2005

All Science Journal Classification (ASJC) codes

  • General Chemical Engineering


  • Hydrocephalus
  • Magnetic field
  • Pressure setting
  • Programmable shunt vale


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