HOLLOW, CURVED, SUPERELASTIC MEDICAL NEEDLE

摘要

PROBLEM TO BE SOLVED: To allow a substance to be injected or absorbed in a lateral direction to the entry direction of an infusion needle.

SOLUTION: A needle assembly 10 comprises an infusion needle that includes a needle cannula 13 made of a superelastic material such as Nitinol. The needle cannula 13 is cold-worked or heat annealed to produce a preformed bend 16 that can be straightened within passageway of a coaxial outer cannula for introduction into the body of a patient. Upon deployment from the outer cannula, the needle cannula 13 substantially returns to the preformed configuration for the introduction or extraction of materials at areas lateral to the entry path of the needle assembly 10. The needle assembly 10 can be constituted of a plurality of needle cannulae 13 of which arrangement and configuration is variable for attaining a desired infusion pattern.

COPYRIGHT: (C)2009,JPO&INPIT