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Objectives: To evaluate the MIC-KEY button vesicostomy as an alternative to indwelling suprapubic catheters (SPCs) for bladder drainage in adults., Patients and Methods: Phase II pilot study prospectively evaluating patients with indwelling SPCs that were converted to MIC-KEY buttons, or cystoscopic-guided de novo insertion, between November 2014 and February 2019. In all, 15 patients (14 female, one male) had indwelling SPCs that had conversion or attempted conversion to MIC-KEY button, and one (male) had a cystoscopic-guided de novo insertion with a history of previous suprapubic catheterisation. The mean (range) age was 44.2 (13-73) years. Catheter-related quality-of-life (C-IQoL) questionnaire data were collected at baseline and 3 months., Results: Two patients had attempted conversion but were abandoned perioperatively due to sizing issues and insertion difficulties, respectively. Three patients were subsequently converted back to a SPC; due to button sizing (18 days), leaking (3 months), and recurrent infection (13 months). The remaining 11 patients have remained well with continued drainage via the MIC-KEY button; mean (range) duration since conversion was 34.2 (5-105) months. The C-IQoL score improved 3 months after insertion, from 50.0 to 75.4. Changes were performed dependent on patient's personalised management, typically every 3 months, under local or general anaesthetic., Conclusion: The MIC-KEY button is a safe alternative to SPC drainage in adults in the short- to medium-term, in a selected cohort., (© 2019 The Authors BJU International © 2019 BJU International Published by John Wiley & Sons Ltd.)