Indwelling needle assembly
AssigneeNipro Corporation
InventorsKazuhiko Tamura, Hiroyuki Nakagami
Life of this patent
Estimating the term…
Abstract
An indwelling needle assembly includes an outer needle hub having an outer needle fixed to the distal end portion thereof, an inner needle hub having an inner needle at the distal end portion thereof, and a needle guard that can accommodate the inner needle and the inner needle hub therein. The needle guard has a double-tube structure including an inner tube and an outer tube, and a connector for connecting the inner needle hub and the inner tube via the proximal end of said needle guard. The needle guard is also expandable by sliding the outer tube toward the proximal end of the inner tube. When the needle guard is extended, the inner needle hub is slid in the needle guard toward the proximal end of the needle guard by the connector.
Claims7
An indwelling needle assembly comprising an outer needle hub having a distal end portion and a proximal end portion;
- an outer needle to be pierced into tissue of a living body and retained in the body fixed to the distal end portion of said outer needle hub;
- an inner needle hub fitted in the proximal end of the outer needle hub and having a distal end portion, an intermediate portion and a proximal end portion;
- an inner needle slidably inserted in a lumen of said outer needle, said inner needle having a sharp blade edge at a distal end portion thereof and being fixed to the distal end portion of said inner needle hub;
- and a needle guard detachably connected to said inner needle hub for accommodating said inner needle and said inner needle hub after use;
- said needle guard having a distal end and a proximal end and comprising a double-tube structure of an inner tube and an outer tube slidably positioned over said inner tube, each of said inner tube and said outer tube having a distal end and a proximal end, a flexible elongated connector having a first end connected to said inner needle hub, a second end connected to the distal end of the inner tube and an intermediate portion connecting said first end of the connector and said second end of the connector via the proximal end of said needle guard, wherein the whole length of said needle guard can be extended by sliding said outer tube toward the proximal end of said inner tube such that as a whole length of said needle guard is extended, said inner needle hub and inner needle is slid within said needle guard toward the proximal end of said needle guard by said connector.
Dependencies are inferred from the claim text.