Mae thrombectomi mecanyddol yn ddull effeithiol o drin strôc isgemig acíwt, gan gynnwys dyhead uniongyrchol, Adalw Stent, neu gyfuniad o'r ddau. Gellir cyflawni dyhead uniongyrchol gan ddefnyddio amrywiaeth o gathetrau o wahanol feintiau yn dibynnu ar ddiamedr y llong occluded.
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 modfedd yn yr MCA a 0.064 modfedd yn yr ICA. Efallai bod y berthynas rhwng maint cathetr a chyfradd llwyddiant ailsianelu oherwydd bod gan y cathetr â diamedr mwy rym sugno mwy pan fydd y cathetr dyhead yn dal y thrombws, gan leihau'r posibilrwydd na fydd y thrombws yn cael ei allsugno a'i ddianc.
Gan nad yw diamedrau pibellau gwaed a chathetrau'r claf yn wahanol iawn, gall fod yn anodd cyflawni hyn yn ymarferol, ac mae angen cathetrau dyhead o wahanol feintiau. Mae'r canlynol yn wahanol opsiynau a roddir gan ysgolheigion. Cyfrifir diamedr optimaidd y cathetr allsugno distal yn ôl cymhareb y diamedr mewnol {{0}}.7–0.8 a'r diamedr allanol 0.8–1.0 , ac mae'r canlyniadau a ddangosir ar gyfer gwahanol ddiamedrau pibellau gwaed.
I grynhoi, mae cymhareb diamedr mewnol y cathetr dyhead i'r diamedr rhydwelïol a fesurir gan angiograffi yn yr ystod 0.7-0.8 wedi'i gydberthyn fwyaf ag ail-sianelu cyflawn. Gall y llawfeddyg ddewis cathetr dyhead mwy priodol o dan arweiniad i wella cyfradd llwyddiant ailsianelu.