| 摘要 |
A dual-lumen blood-treatment catheter (1) comprises two lumina (4, 5) which open towards the patient end of the catheter for removal and return of blood to the patient. The catheter has expandable means (8, 60) towards the patient end of the catheter for atraumatically preventing collapse of a vessel into which the catheter is inserted so as to ensure free flow of blood into and out of the catheter. The two lumina may be an outer lumen (4) and an inner lumen (5), the inner lumen (5) extending within the outer lumen (4). The outer lumen (4) has a plurality of slits (7) around its circumference which form slats (8) therebetween. Withdrawal of the inner lumen (5) relative to the outer lumen (4) causes the slits (7) to open, thereby bowing the slats (8) to expand the outer lumen. |
