| 主权项 |
1. A device for parenterally transferring fluid to or from a patient, the device comprising:
a housing that defines a fluid flow path, the housing configured to be coupleable to a fluid reservoir; a needle having a distal end portion, a proximal end portion, and defining a lumen therebetween, the distal end portion configured for insertion into the patient, the proximal end portion configured to be fluidically coupleable to the fluid flow path; and an occlusion mechanism operable to selectively control fluid flow between the needle and the fluid flow path, the occlusion mechanism including an occlusion member configured to selectively obstruct the lumen of the needle during insertion into the patient, the occlusion mechanism being configured to be moved between a first configuration such that the lumen of the needle is obstructed during insertion into the patient, and a second configuration such that the lumen of the needle is unobstructed after the needle has been inserted into the patient allowing fluid transfer to or from the patient the occlusion mechanism further including a retractor disposed in the housing and coupled to the occlusion member, the retractor configured to move the occlusion member from a first position to a second position to place the occlusion mechanism in the second configuration, wherein the occlusion member is disposed at the distal end portion of the needle in the first position, and wherein the needle has a beveled distal end and the occlusion member has a beveled distal end, the beveled distal ends of the needle and the occlusion member being substantially coplanar when the occlusion member is in the first position. |
