Hypodermic Needle Testing

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Hypodermic Needle Testing

Hypodermic needles are most commonly used for injecting medication either intramuscularly or intravenously. It is the fastest way for the medication to be absorbed into the blood stream. It's important to evaluate the needle's maximum tensile strength and yield strength. One of the challenges of testing a tubular sample is gripping it without slipping or causing premature failure.

What test machine requirements are needed per ISO 9626?

  • Needle Tubing Stiffness (ISO 9626 Annex B)
    • Requires 3 point bend fixture with 1 mm radius roller
    • Test Speed range of 1 to 10 mm/min
    • 60 N (11 lb) max load
    • Requires tubing deflection measurement to nearest 0.01 mm
  • Break Resistance (ISO 9626 Annex C) Test to measure resistance of tubing to breakage
    • One end of the tubing is fixed
    • Force is applied to the tubing at a specified distance from the point of fixation, so as to bend the tubing through a specified angle, first in one direction and then in the opposite direction, for 20 cycles at a test speed of 0.5 hz

What test machine requirements are needed per ISO 7864?

  • Drag Force Test (ISO 7864 Annex D) the needle pierces a substrate at a constant test speed while measuring force peak and friction force
    • Constant speed of 100 mm/min (4 ipm)
    • Report peak force and drag force
  • Bonding strength test (ISO 7864 Annex E) measures the strength of the bond between the needle tube and needle hub.
    • Maximum load 500 N (110 lb)
    • Constant speed of 50 mm/min (2 ipm)