Applying value stream mapping techniques to eliminate non-value-added waste for the procurement of endovascular stents

Eur J Radiol. 2012 Jan;81(1):e47-52. doi: 10.1016/j.ejrad.2010.12.045. Epub 2011 Feb 11.


OJECTIVES: To eliminate non-value-adding (NVA) waste for the procurement of endovascular stents in interventional radiology services by applying value stream mapping (VSM).

Materials and 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.

Conclusion: 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.

MeSH terms

  • Algorithms*
  • Blood Vessel Prosthesis / statistics & numerical data*
  • Blood Vessel Prosthesis / supply & distribution*
  • Inventories, Hospital / methods*
  • Operations Research
  • Stents / statistics & numerical data*
  • Stents / supply & distribution*