Khi tien ha nh c h g c c a c trocart phdu t huat (tr ocart 6 m m ) d tren ve h o a n to an d u g c k ie m sodt, h o an toan d u g c n hin tha y tren m a n h in h ( h i nh 13 x e m d phu ban). Chi x a c d inh d u g c cdc vi trf c h o c cdc tro ca rt p ha u t h ua t sau khi da q u a n sat tieu k h u n g , o b u n g . Cdc vi trf c h o c phu t h u o c vao: chi d i n h , tinh trang tai c h o (dfnh...), n g u d i b enh. C u n g n h u moi loai p ha u t h ua t noi soi, so l u g n g trocart phai du de t h a m do va tien h a n h cdc t h a o tac p h a u thua t. N en t r an h c h o c cdc t roc art m a sau do k h o n g h a y ft sir d u n g den. Cdc tr oc a rt t h u d n g d u g c sir d u n g co d u d n g kfnh 6 m m . Co loai tr oc a rt c o r a n h x o a n d vo ngoai lam c h o trocart k h o bi t h a y doi vi trf t r on g khi tien h a n h thu thuat. Vdi loai trocart vd ngoa i n ha n , m u o n c h o troc art ft bi t rugt thi ne n ra ch da nho. Tat n h i e n ra ch da n h o se lam lam c h o b u d c c h o c tr oc a rt c o k h o k h a n h a n , n h u n g se t h u a n lgi h a n t r on g suot tien trinh thu thuat. Khi c h g c cdc trocart pha u thuat, h u d n g c h o c phai v u o n g g oc vdi ma t p h a n g t h a n h b u n g ( hinh 14 x e m d phu b an) . D i e m m a u c h o t khi tien h a n h c h o c tr oc a rt tren ve la phai t ra n h lam t h u o n g ton c a c m a c h m a u d t h a n h b u n g , da c biet la hai d o n g m a c h t h u g n g vi. M u o n va y c an phai n a m v u n g giai phdu vi trf c dc m a c h m a u c u a t h a nh b u n g trudc ben, khi xa c dinh vi trf c h o c phai tim cdc
m a c h m a u b i n g phirang p h a p c h i eu s a ng q u a t hanh b un g de t ra n h c h a m phai m a c h m a u . C6 dien, ngu oi ta chi c h o c c a c trocart p h i u t huat 6 t rong tam giac an toan ( da y la n en b a n g q u a n g , hai c a n h be n la c a c d o n g m a c h ron hay c on goi la d ay treo ba ng q u a n g ) . T u y n h ie n , phau t huat noi soi n g a y c a n g tien trien, c i n thiet phai dua ba d u n g cu pha u thuat c u n g m ot luc, do vay nguoi ta tien h a nh c h o c trocart 6 ben n goai d o n g m a c h t h u o n g vi, doi khi o ngoai kha xa. Mot so tieu c h u i n c h o phe p d a n h gia vi trf c h o c c a c t rocart p h i u thuat dat ye u cau la:
- G o c g i ua trocart voi tang dfch c a n phai c an thiep c a n g ga n 90° c a n g tot. - Tr oc ar t p h i u t huat tra nh s o ng s o ng voi den soi.
- G i u a c a c trocart p h i u thuat phai co mot k h o a n g c a c h nhat d inh de’ tra nh g ay c an tro lan n ha u khi tien h a nh c a c thao tac. K h o a n g c a c h g i ua c a c trocart phau thuat toi thieu nen la 8 cm (hinh 15 x e m o phu ban).