| 摘要 |
A hollow needle comprising a shaft having a distal portion suitable for passing through an elastomer closure of a container, said shaft extending in a longitudinal direction and having a central longitudinal axis, and having an internal longitudinal conduit therein for the flow of liquid and one or more orifices communicating between the conduit and the exterior of the needle, the distal portion of the shaft being provided with a pointed end that has a profile comprising a cutting edge in the form of two part cutting edges converging in the longitudinal direction to meet at the needle point, each part cutting edge extending in a straight line in a widthways direction across a plane including the central longitudinal axis, on both widthways sides of the cutting edge the pointed end having a profile which is a non-cutting surface, wherein the pointed end of the needle tapers from an outer surface of said distal portion toward the point of the needle, and the distance, measured in a further plane defined by said two part cutting edges between the outermost ends of said part cutting edges, is smaller than the largest outer dimension of said distal portion, measured perpendicular to said central axis in said further plane. |
