title: Applying value stream mapping techniques to eliminate non-value-added waste for the procurement of endovascular stents.
abstract: OJECTIVES: To eliminate non-value-adding (NVA) waste for the procurement of endovascular stents in interventional radiology services by applying value stream mapping (VSM).
  
  
  METHODS
  The Lean manufacturing technique was used to analyze the process of material and information flow currently required to direct endovascular stents from external suppliers to patients. Based on a decision point analysis for the procurement of stents in the hospital, a present state VSM was drawn. After assessment of the current status VSM and progressive elimination of unnecessary NVA waste, a future state VSM was drawn.
  
  
  RESULTS
  The current state VSM demonstrated that out of 13 processes for the procurement of stents only 2 processes were value-adding. Out of the NVA processes 5 processes were unnecessary NVA activities, which could be eliminated. The decision point analysis demonstrated that the procurement of stents was mainly a forecast driven push system. The future state VSM applies a pull inventory control system to trigger the movement of a unit after withdrawal by using a consignment stock.
  
  
  CONCLUSIONS
  VSM is a visualization tool for the supply chain and value stream, based on the Toyota Production System and greatly assists in successfully implementing a Lean system.
authors.affiliation: Department of Radiology, Charité University Hospital Berlin, Charitépaltz 1, 10117 Berlin, Germany. ulf.teichgraeber@charite.de
authors.forename: Ulf K
authors.initials: UK
authors.lastname: Teichgräber
authors.forename: Maximilian
authors.initials: M
authors.lastname: de Bucourt
mesh_terms: D000465:Algorithms; D001807:Blood Vessel Prosthesis / Q000706:statistics & numerical data* / Q000600:supply & distribution*; D007445:Inventories, Hospital / Q000379:methods*; D009874:Operations Research; D015607:Stents / Q000706:statistics & numerical data* / Q000600:supply & distribution*