Double hole pencil point needle

One of the criticisms of even the modified Sprotte needle was that the long lateral hole may still straddle the dura, resulting in incomplete block and loss of local anaesthetic solution. Eldor suggested a design in 1996 that was based on the pencil-point tip but with two lateral holes opposite each other (Fig. 23). His theory was that the area of the two holes is equal to that of the Sprotte needle, allowing rapid flow of CSF and more even distribution of local anaesthetic solution. Injection may proceed even if one of the holes is occluded by tissue. The smaller area of the individual holes leaves the tip more resistant to deformation than the Sprotte needle. The double-hole pencil-point needle received a mixed reception due to initial manufacturing and quality control issues but still has its supporters.

Figure 23

Double hole pencil point needle (1996).

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