VibraTip: A pocket-sized disposable device for testing the integrity of sensation in the outpatient setting.

Manchester Diabetes Centre, University of Manchester and Central Manchester Foundation Trust Division of Cardiovascular Medicine, Core Technology Facility, University of Manchester and Central Manchester Foundation Trust Division of Biology and Ecology, Manchester Metropolitan University, Manchester, UK.
Diabetic Medicine (Impact Factor: 3.12). 06/2012; 29(12). DOI: 10.1111/j.1464-5491.2012.03730.x
Source: PubMed


Diabet. Med. 29, 1550–1552 (2012)
Aims To compare the Ipswich Touch Test and the VibraTip with the Neuropathy Disability Score and the vibration perception threshold for detecting the ‘at-risk’ foot.
Methods We directly compared the Ipswich Touch Test and the VibraTip with both the Neuropathy Disability Score ≥ 6 and the vibration perception threshold ≥ 25 V indicating ‘at-risk’ feet in 83 individuals.
Results The vibration perception threshold and Neuropathy Disability Score tests exhibited almost perfect agreement with each other (P < 0.001). The VibraTip and Ipswich Touch Test results were identical (P < 0.001). The VibraTip and Ipswich Touch Test results also exhibited almost perfect agreement with the vibration perception threshold (P < 0.001) and the Neuropathy Disability Score (P < 0.001).
Conclusions These two simple and efficient tests are easy to teach, reliable and can be used in any setting, and neither requires an external power source. We conclude that both the VibraTip and the Ipswich Touch Test are reliable and sensitive tests for identifying the ‘high-risk’ foot.

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Available from: Rayaz A Malik, Oct 13, 2014
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    ABSTRACT: VibraTip® is a battery-powered, disposable, key fob-sized source of vibration used to assess the integrity of vibration perception. To find out how long the device lasts, the stability of its vibration output was measured in response to two usage patterns:-in the first, VibraTip® was subject to 7000 half second activations separated by 2 second rests. This yielded fairly consistent frequency output for the first 6000 activations but an early reduction in amplitude over the first 1000 activations, steadying between 2000 and 6000 the second, designed to mimic more closely real life clinical usage, runs of ten, half second activations at 2 second intervals were interspersed by 10 minute rests. The cycle was repeated 350 times in all with additional overnight rests to allow electrochemical recovery. VibraTip® performance under these conditions was highly consistent over at least the first 1500 activations, with very little change in vibration frequency even after 3500 discharges.These results indicate that usage patterns markedly affect VibraTip® durability. Rests between 'patients' and overnight, characteristic of normal clinical activity, suggests that VibraTip® is likely to provide very consistent performance in the clinical arena for many months of routine use.
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