Automatic Injection Pressure Limiter

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ISO Luer and ISO NRFit®


Automatic Injection Pressure Limiter

Ultrasound-guided localisation of peripheral nerves and the associated real-time visualisation provide crucial benefits in regional anaesthesia.1 Nonetheless, it is clear that this does not reduce the incidence of permanent nerve damage.2 Even in combination with nerve stimulation, intrafascicular injections cannot be ruled out.1,3,4,5 The causes include incorrect positioning of the needle along with exceeding critical injection pressures.

With the automatic injection pressure limiter NerveGuard, developed by Pajunk, the injection pressure is automatically limited to avoid nerve damage.

NerveGuard Overview

NerveGuard Features & Advantages

  • Detects incorrect cannula positioning (fascia or nerve contact)
  • Prevents intrafascicular injections in cases of excessive pressure
  • Automatically blocks injections when injection pressure exceeds the limit value
  • Provides important information regarding position correction
  • Avoids nerve damage and increases patient safety


1 Choquet O., Capdevila X. Ultrasound-guided nerve blocks: the real position of the needle should be defi ned, Anaesth. Analg. 2012 May; 114(5): 929–930
2 Neil J. M., Brull R., Horn J. L., Liu S. S., McCartney C. J., Perlas A., Salinas F. V., Tsui B. C. The Second American Society of Regional Anesthesia and Pain Medicine Evidence-Based Medicine Assessment of Ultrasound-Guided Regional Anesthe-sia, Reg. Anaesth. Pain Med. 2016 March–April; 41(2): 181–194
3 Robards C., Hadzic A., Somasundaram L., Iwata T., Gadsden J., Xu D., Sala-Blanch X. Intraneural injection with low-current stimulation during popliteal sciatic nerve block, Anesth. 2009 Aug; 109(2): 673– 677
4 Vassiliou T., Müller H. H., Limberg S., De Andres J., Steinfeldt T., Wiesmann T. Risk evaluation for needle-nerve contact related to electrical nerve stimulation in a porcine model, Acta Anaes-thesiol. Scand. 2016 Mar; 60(3): 400–406

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