Patent ID: 6391007
Filing Date: 2002-05-21
Classification: A61M

Abstract:
A needle assembly comprising:a cannula having an inner wall which defines an inner dimension and sharp tip; a solid blunt disposed within said cannula, said solid blunt having an outer dimension which is nearly equal to said inner dimension of said cannula; wherein said solid blunt substantially blocks fluid flow in a first circumferential portion of said inner wall and allows fluid flow in a second circumferential portion of said inner wall; and a clip coupled to said solid blunt, said clip coupled slidably to a frame which is coupled to said cannula so that said solid blunt cannot rotate within said cannula, and wherein said solid blunt is held in one of two positions by said clip: (a) a first position in which said solid blunt does not extend beyond said sharp tip and is within said cannula, and (b) a second position in which said solid blunt extends beyond said sharp tip and outside of said cannula.