Mekanisk trombektomi er en effektiv metode til behandling af akut iskæmisk slagtilfælde, herunder direkte aspiration, stentgenhentning eller en kombination af begge. Direkte aspiration kan udføres ved hjælp af en række katetre af forskellige størrelser afhængigt af diameteren af det okkluderede kar.
Some scholars have divided the angiographic results into three types: "complete recanalization", "partial recanalization" (in the case of thrombus migration downstream of the branch or distal thrombus in the area supplied by the recanalized arterial segment) and "no recanalization". At the same time, the arterial diameter was measured independently before surgery, and the inner diameter of the distal end of the aspiration catheter (DAC) was collected. The inner diameter of the catheter was divided by the arterial diameter (AD) . Through testing and research, it was found that the ratio of the inner diameter of the catheter to the inner diameter of the artery was significantly different between the three recanalization categories, among which the "complete recanalization group" had the highest ratio and the "no recanalization" group had the lowest ratio. Therefore, it was confirmed that the larger diameter of the aspiration catheter relative to the arterial diameter was associated with an increase in the success of recanalization. At the same time, it was reported that larger aspiration catheters had better recanalization effects than smaller catheters, especially catheters with a diameter of >{{0}}.040 tommer i MCA og 0,064 tommer i ICA. Forholdet mellem kateterstørrelse og succesrate for rekanalisering kan skyldes, at kateteret med større diameter har en større sugekraft, når aspirationskateteret fanger tromben, og derved reducerer muligheden for, at tromben ikke bliver aspireret og undslippet.
Da diametrene på patientens blodkar og katetre ikke er meget forskellige, kan dette være svært at opnå i praksis, og der kræves forskellige størrelser af aspirationskatetre. Følgende er forskellige muligheder givet af forskere. Den optimale diameter af det distale aspirationskateter beregnes ud fra forholdet mellem den indre diameter {{0}}.7–0.8 og den ydre diameter 0.8–1.0 , og de viste resultater er for forskellige blodkardiametre.
Sammenfattende er forholdet mellem aspirationskateterets indre diameter og arteriediameteren målt ved angiografi i området 0.7-0.8 mest korreleret med fuldstændig rekanalisering. Kirurgen kan vælge et mere passende aspirationskateter under vejledning for at forbedre succesraten for rekanalisering.