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Safety of lignocaine test dose to detect intravenous injection

We wish to thank the authors, Drs Sinden and Jayamaha for bringing this incident to our attention and we acknowledge that the cannula in question was missing its valve. We have investigated this incident most carefully but regret that we cannot bring our investigation to a satisfactory conclusion to explain the omission of the valve. Following over-moulding of the wing to the cannula, the insertion ofthe valve, leak testing and fitting of the port cap is an automated procedure. Any cannula which fails the leak test would not have a port cap applied. We can therefore only conclude that this particular cannula passed through the leak testing stage undetected. The total quantity in this batch was 35 317 and this is the only defect report received. It is also the only defect of this nature reported in the history of the manufacture of this product. We offer our apologies to Drs Sinden and Jayamaha.