Patent ID: 8043265

Claim:
An indwelling needle comprising: an outer cannula for indwelling placement in a patient, said cannula having a housing attached to a proximal end thereof; an inner needle having a connection part at a proximal end thereof and a needle tip protector positioned within said housing and around said inner needle wherein said needle tip protector comprises a first portion having a sidewall defining a through-hole of a first diameter and a second portion having a sidewall defining a through-hole of a second diameter, smaller than said first diameter and wherein said sidewall of said first portion comprises at least one blocking member attached thereto and inwardly movable, said inner needle having a tip portion and a main portion, said tip portion having a larger diameter than said main portion and wherein said tip portion, said main portion and said second portions are dimensioned such that the main portion but not said tip portion is slidable through said through-hole of said second portion; and wherein said indwelling equipment is configured such that withdrawing said inner needle from the cannula in a proximal direction causes the tip portion to engage with said second portion, thereby withdrawing said needle tip protector from said housing and causing said at least one blocking member to move inwardly into said first portion through-hole so as to trap said tip portion therein.