Vitreous flow rates through dual pneumatic cutters: effects of duty cycle and cut rate

Figures & data

Figure 1 Vitreous flow through enhanced 25-gauge probes.

Notes: Each data point represents the average flow rate calculated from six probes, with error bars representing 95% CIs. The asterisks mark flow rate values that are significantly higher than the corresponding values obtained with 25-gauge probes (P<0.05). (A) Biased closed duty cycle; (B) 50/50 duty cycle; (C) biased open duty cycle. Bold lines indicate linear regression trends.
Abbreviations: CI, confidence interval; cpm, cuts per minute.

Figure 2 Vitreous flow through 25-gauge probes.

Notes: Each data point represents the average flow rate calculated from six probes, with error bars representing 95% CIs. (A) Biased closed duty cycle; (B) 50/50 duty cycle; (C) biased open duty cycle. Bold lines indicate linear regression trends.
Abbreviations: CI, confidence interval; cpm, cuts per minute.

Figure 3 Vitreous flow through 23-gauge probes.

Notes: Each data point represents the average flow rate calculated from six probes, with error bars representing 95% CIs. (A) Biased closed duty cycle; (B) 50/50 duty cycle; (C) biased open duty cycle. Bold lines indicate linear regression trends.
Abbreviations: CI, confidence interval; cpm, cuts per minute.

Figure 4 Vitreous flow through 20-gauge probes.

Notes: Each data point represents the average flow rate calculated from six probes, with error bars representing 95% CIs. (A) Biased closed duty cycle; (B) 50/50 duty cycle; (C) biased open duty cycle. Bold lines indicate linear regression trends.
Abbreviations: CI, confidence interval; cpm, cuts per minute.

Figure 5 Comparison of flow for vitreous body and for buffered saline solution (“aqueous”).

Notes: All results are for the biased open duty cycle mode and represent average flow rate calculated from six probes. Fold differences between vitreous and aqueous flow are provided. (A) 20-gauge probe; (B) 23-gauge probe; (C) 25-gauge probe; (D) enhanced 25-gauge probe.
Abbreviation: cpm, cuts per minute.