A guide tube (220) has a guidewire-engaging portion (222) at a distal portion (260) thereof, a first stent (54) surrounding the guide tube, advanceable together with the guide tube into a subject's lumen, a guidewire (12) arranged (i) entering the guide tube from a distal-end (320) opening thereof, (ii) disposed in the guidewire-engaging portion, and (iii) passing out of the guide tube proximally to the guidewire-engaging portion, and a second stent (54), proximal to the first stent, surrounding a proximal portion (240) of the guide tube and the guidewire. The first stent is slidably deployable off the distal end of the guide tube upon the guidewire having laterally exited the guidewire-engaging portion, and the second stent is slidably deployable off the distal end of the guide tube subsequently to deployment of the first stent, without the guidewire having been moved proximally. Other applications are also described.