title: Deflation of a Foley catheter balloon.
abstract: OBJECTIVE
  To investigate the changes in urethral and suprapubic catheter balloons following deflation and removal.
  
  
  METHODS
  Observations were made on a selection of catheter materials, using three different deflation methods. Measurements were recorded before inflation and following deflation of catheter balloons.
  
  
  RESULTS
  The analysis identified that before inflation all catheter balloons were 1-2 mm wider than the Charrière size. Following balloon inflation, five balloons were unchanged in appearance, four were slightly misshapen and the Coude balloon inflated at the side of the catheter shaft.
  
  
  CONCLUSIONS
  The study has shown that manual syringe aspiration results in the formation of creases and ridges, and an increase in catheter balloon diameter size on deflation. Self-syringe aspiration should not be used when deflating catheter balloons. It does not, however, cause the balloon membrane to collapse or become deformed.
authors.affiliation: Continence Advisory Service, Morecambe Bay Primary Care Trust, Lancaster. John.Robinson@mbpct.nhs.uk
authors.forename: John
authors.initials: J
authors.lastname: Robinson
mesh_terms: D002404:Catheterization / Q000295:instrumentation / Q000379:methods* / Q000451:nursing; D002408:Catheters, Indwelling; D020878:Device Removal / Q000379:methods*; D004867:Equipment Design; D006801:Humans; D011182:Postoperative Care; D014546:Urinary Catheterization / Q000295:instrumentation / Q000379:methods* / Q000451:nursing