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Retractable Needle


Patients with end-stage renal disease are largely dependent on dialysis as renal replacement therapy. In haemodialysis, blood is passed through a membrane called a dialyzer, or artificial kidney ~3 times a week in order to filter out excess waste and water. The filtered blood is then returned to the body through the second needle. A hematoma (localized bleeding outside of blood vessels) resulting from incorrect needle cannulation if a very frequent problem. Major fistula infiltration occurs with ~5.2% of hemodialysis patient each year. Additionally, incorrect cannulation requires re-cannulation, which is both bad for the vessel, and results in discomfort for the patient. Moreover, 0.4% of all dialysis deaths are due to hematoma (Jose et al, 2017).

Technology Overview

A needle within a cannulation sheet has been designed that automatically retracts to a safe position when contact is made with the bloodstream. When the needle enters the vessel and blood enters the needle, a mechanism is activated which causes the needle to retract ‑ whilst leaving the sheet in place. Therefore, there is no opportunity to puncture the opposing vessel wall.


  • Hemodialysis access cannulation. 
  • Arterial line placement.
  • Pediatric venous cannulation.

Key benefits

  • The retractable needed would reduce the risk of hematoma, and the need of re-cannulation. 
  • The user doesn't have to retract the needle manually, resulting in more control over the needle in the blood stream.

Patent status

Patent filed.

Further information

Jofey Chadwick Sr. Business Developer +31-71-527 2689 +31-6-1474 7861