A device (1) for facilitating the delivery of components along guidewires to branches of a tubular system. The device has particular application for the percutaneous treatment of vascular and non-vascular disease, and more specifically for balloon angioplasty or the deployment of stents. The device includes a shaft (3) and two or more guidewire lumina (4, 5) interconnected to and parallel to one another, each lumen having an open distal end and an open proximal end on the shaft (3). In a preferred form the device includes a manipulation aid (2) at a proximal end of the shaft (3) which can engage one of the guidewires (6), and which facilitates rotation of the device. The invention also includes a method of positioning guidewires for the subsequent delivery of components such as stents to lesions at a bifurcation, using the guidewire positioning device.