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The Hakim programmable valve: reasons for reprogramming failures.

Uwe Max Mauer1, Jens Schuler, Ulrich Kunz

  • 1Department of Neurosurgery, Armed Forces Hospital, Ulm, Germany. uwe-max.mauer@dgn.de

Journal of Neurosurgery
|October 17, 2007
PubMed
Summary
This summary is machine-generated.

Reprogramming failures of Medos Hakim programmable valves are rare, occurring in about 1.5% of cases. Reasons included valve rotation, loose parts, dislodged markers, and deposits, sometimes requiring explantation.

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Area of Science:

  • Neurosurgery
  • Biomedical Engineering
  • Medical Devices

Background:

  • Programmable valves are used to manage hydrocephalus.
  • Adjustments to Medos Hakim valve settings may be needed post-implantation.
  • Reprogramming failures can occur, necessitating investigation.

Purpose of the Study:

  • To identify the causes of reprogramming failures in Medos Hakim programmable valves.
  • To analyze the incidence and reasons for failed valve adjustments.

Main Methods:

  • Retrospective and prospective review of patient records (1992-2006).
  • Analysis of 585 Medos Hakim programmable valve implantations.
  • Investigation of 12 cases with reprogramming failure, including explanted valve examination.

Main Results:

  • Reprogramming failure occurred in 12 out of 585 cases (approx. 1.5%).
  • Three failures were resolved by repositioning the transmitter.
  • Nine cases required explantation due to valve rotation, loose parts, dislodged markers, or internal deposits.

Conclusions:

  • Failed reprogramming of Medos Hakim valves is a rare event.
  • Identified causes of failure include mechanical issues and deposits.
  • The valve's programming mechanism is generally reliable, with few cases needing replacement.