Purpose: We hypothesized that the size of syringe influenced needle control in physician-performed procedures.
Materials and methods: Operators were tested for their ability to control a 1-, 3-, 5-, 10-, and 20-mL syringe and equivalent sizes of the new safety device, the reciprocating procedure device (RPD), using the quantitative needle-based displacement method. Three hundred twenty clinical syringe procedures were then randomized to either a 3- or 10-mL conventional syringe or to a 3- or 10-mL RPD. Patient pain was measured with the Visual Analog Pain Scale (VAPS).
Results: Increasing syringe size was associated with the undesirable characteristic of unintended forward penetration (loss of control of the needle in the forward direction) (r(2) = 0.97, slope = 2.14, 95% CI: 1.54-2.76, P < 0.002), and unintended retraction (loss of control of the needle in the reverse direction) (r(2) = 0.97, slope 2.15, 95% CI: 1.54-2.76, P < 0.002). In addition, 2-handed operation of a syringe resulted in greater control than 1-handed operation of a syringe (P < 0.001). When 1-handed operation was required, the RPD control syringe reduced unintended penetration by 52.3% (P >or= 0.001), unintended retraction by 56.8% (P >or= 0.001), and patient pain by 54.7% (P >or= 0.001) at each device size.
Conclusions: For greater safety and control when operating the conventional syringe, smaller syringe sizes and 2 hands instead of 1 hand should be used whenever possible. If 1-handed operation of a syringe is necessary, a safety technology like the RPD control syringe should be used.
Trial registration: ClinicalTrials.gov NCT00651625.