INDWELLING NEEDLE DEVICE

• US 20130066276A1
• Filed: 04/26/2011
• Published: 03/14/2013
• Est. Priority Date: 06/04/2010
• Status: Active Grant

• Current Assignee: JMS Company Limited
• Original Assignee: JMS Company Limited
• Inventors: Ito, Toru, Fujii, Ryoji
• Granted Patent: US 8,920,378 B2
• Time in Patent Office: Days
• US Class Current: 604/164.08
• CPC Class Codes: A61M 25/0606 "Over-the-needle" catheter assemblies, e.g. I.V. catheters
• CPC Class Codes: A61M 25/0631 having means for fully covering the needle after its withdrawal, e.g. needle being withdrawn inside the handle or a cover being advanced over the needle
• CPC Class Codes: A61M 5/158 Needles for infusions; Accessories therefor, e.g. for inserting infusion needles, or for holding them on the body

Abstract

When a hub (40) is in an initial position at which it is located on the front end side of an inner cavity of a shield (20), an inner needle (50) penetrates an outer needle (30) and protrudes from a leading end of the outer needle to the outside, and when the hub is in a retracted position at which it is located on the rear end side of the inner cavity of the shield, the inner needle is housed within the inner cavity of the shield. A first side hole (31) is formed in an outer circumferential face of the outer needle, and a second side hole (51) is formed in an outer circumferential face of the inner needle. When the hub is in the initial position, an inner circumferential face of a region (33) of the outer needle that contains the first side hole is in close contact with the outer circumferential face of the inner needle, and the second side hole is located closer to the hub than the region where the inner circumferential face of the outer needle is in close contact with the outer circumferential face of the inner needle. Thus, a priming operation for filling a gap between the inner needle and the outer needle with blood can be easily performed, and leakage of blood through the side hole of the outer needle during puncture does not occur.

Claims

1. An indwelling needle device comprising:

a shield having an inner cavity;

a soft outer needle fixed to a front end of the shield;

a hub that is disposed within the inner cavity of the shield and is movable in a longitudinal direction of the shield; and

an inner needle fixed to a front end of the hub,

wherein the hub is displaced between an initial position at which the hub is located on a front end side of the inner cavity of the shield and the inner needle penetrates the outer needle and protrudes from a leading end of the outer needle to an outside and a retracted position at which the hub is located on a rear end side of the inner cavity of the shield and the inner needle is housed within the inner cavity of the shield,

a first side hole penetrating an outer circumferential face of the outer needle is formed in the outer needle,

a second side hole penetrating an outer circumferential face of the inner needle is formed in the inner needle, and

when the hub is in the initial position, an inner circumferential face of a region of the outer needle that contains the first side hole is in close contact with the outer circumferential face of the inner needle, and the second side hole is located closer to the hub than the region where the inner circumferential face of the outer needle is in close contact with the outer circumferential face of the inner needle.

2. The indwelling needle device according to claim 1, wherein when the hub is in the initial position, a gap between the inner circumferential face of the outer needle and the outer circumferential face of the inner needle is formed in a location that is closer to the shield than the region where the inner circumferential face of the outer needle is in close contact with the outer circumferential face of the inner needle, and the second side hole is in communication with a space between an outer face of the hub and an inner face of the shield via the gap.

3. The indwelling needle device according to claim 1, wherein when the hub is in the initial position, the first side hole is not in communication with the second side hole.

4. The indwelling needle device according to claim 1, wherein when the hub is in the initial position, a gap between the inner circumferential face of the outer needle and the outer circumferential face of the inner needle is formed in a location that is closer to the shield than the region where the inner circumferential face of the outer needle is in dose contact with the outer circumferential face of the inner needle, and the first side hole is not in communication with the gap.