| 摘要 |
An improved multi-lumen catheter with tip configurations for the simultaneous injection and withdrawal of fluids. The multi-lumen catheter is a hollow cylindrical structure preferably made of polyurethane. It includes an outer catheter, generally used for the removal of fluid from a patient, and an inner catheter, generally used for injection of fluids into a patient. The inner catheter is contained within the outer catheter, extends throughout its length and is bisected by a septum to create two parallel lumens. The shape of each lumen depends on the shape of the septum. For example, if the inner catheter is split in half, the resulting two lumens are D-shaped. The inner catheter is secured by either the outer catheter's tapered distal end, or a bond, wherein the bond secures the inner catheter to the outer catheter. In a preferred embodiment, the inner catheter extends beyond the distal end of the outer catheter to promote a better separation between intake fluid and outflow fluid. The tips can be bevelled, curved, slanted or otherwise altered so that occlusion is less likely. Further, side openings can be cut into either the outer catheter, the inner catheter, or both to improve the reliability of blood flow in case that one of the lumens becomes occluded. Additionally, the multi-lumen catheter can be supplied with a protective sheath to maintain a sterile environment. |
