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O-009 Pump versus syringe: aspiration thrombectomy direct pressure comparisons in a comprehensive benchtop 3D-printed circle of willis model
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O-009 Pump versus syringe: aspiration thrombectomy direct pressure comparisons in a comprehensive benchtop 3D-printed circle of willis model
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Journal Article
O-009 Pump versus syringe: aspiration thrombectomy direct pressure comparisons in a comprehensive benchtop 3D-printed circle of willis model
2025
Overview
Background and ObjectivesExperiments have shown 60-cc syringes generate stronger vacuum forces than mechanical pumps. However, few studies have measured catheter tip suction pressure during thrombus engagement. Therefore, this study aimed to compare aspiration forces and pressure drops, generated by mechanical pumps and 60-cc syringes connected to various catheters when aspirating synthetic clots in a 3D-printed model.MethodsThe system included a programmable pulsatile pump, a 3D-printed tissue-matched circle of Willis model, radiopaque synthetic blood clots positioned in the left internal carotid artery terminus, and pressure recordings at 500±10% ml/min and 120/80±10 mmHg. Each catheter underwent three soft and hard clot removal trials using a 60-cc syringe and an aspiration pump. Aspiration source pressure was recorded before, during, and after aspiration. The evaluated variables included engagement pressure change (ΔP engagement), aspiration pressure drops (ΔP aspiration), and pressure efficiency (PE), defined as the percentage of peak pressure (PP) maintained during aspiration.ResultsAspirating soft clots with syringes showed low engagement pressure drops (ΔP engagement) (0–14 mmHg), high PE at 93–99% of Pp, and minimal aspiration pressure drops (ΔP aspiration) (6F catheters: 4–8 mmHg, 8F catheters: 19 mmHg). Conversely, using a pump generated moderate ΔP engagement (6F: 16–51 mmHg, 8F: 122 mmHg), lower PE (69–93% of Pp), and greater ΔP aspiration (6F: 143–151 mmHg, 8F: 270 mmHg). For hard clots, syringes exhibited minimal ΔP engagement and ΔP aspiration (4–13 mmHg and 3–12 mmHg, respectively), while pumps showed moderate ΔP engagement (2–34 mmHg) and large ΔP aspiration (6F: 82–162 mmHg, 8F: 280 mmHg).ConclusionSyringe aspiration generates higher vacuum pressures and smaller pressure drops than aspiration pumps, likely due to vacuum tubing resistance in aspiration pumps. This effect is particularly evident with hard clots and larger ID catheters.Abstract O-009 Figure 1Abstract O-009 Figure 2DisclosuresH. Berns: None. K. Han: None. F. Ramirez-Velandia: None. K. Lewis: None. S. Robertson: None. W. Clark: None. J. Wells: None. M. Alnajrani: None. C. Rapoport: None. K. Hakes: None. J. Granstein: None. C. Ogilvy: None. T. Becker: None. M. Young: None.
Publisher
BMJ Publishing Group LTD
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