Puncture device

• US 9,220,838 B2
• Filed: 03/25/2014
• Issued: 12/29/2015
• Est. Priority Date: 09/26/2011
• Status: Active Grant

• Current Assignee: Terumo Kabushiki Kaisha
• Original Assignee: Terumo Kabushiki Kaisha
• Inventors: Soma, Takahiro, Kohno, Hiromasa
• Primary Examiner(s): Mehta, Bhisma
• Assistant Examiner(s): Ponton, James
• Application Number:
  US14/225,074
• Publication Number:
  US 20140228759A1
• Time in Patent Office: 644 Days
• US Class Current: 1/1
• CPC Class Codes: A61M 1/36 Other treatment of blood in a by-pass of the natural circulatory system, e.g. temperature adaptation, irradiation ; Extra-corporeal blood circuits
• CPC Class Codes: A61M 2005/1401 Functional features
• CPC Class Codes: A61M 2005/14252 with needle insertion means
• CPC Class Codes: A61M 2005/14268 with a reusable and a disposable component
• CPC Class Codes: A61M 2005/1585 Needle inserters
• CPC Class Codes: A61M 2205/10 with powered movement mechanisms
• CPC Class Codes: A61M 2205/3379 Masses, volumes, levels of fluids in reservoirs, flow rates
• CPC Class Codes: A61M 2205/502 User interfaces, e.g. screens or keyboards
• CPC Class Codes: A61M 25/0606 "Over-the-needle" catheter assemblies, e.g. I.V. catheters
• CPC Class Codes: A61M 5/14248 of the skin patch type
• CPC Class Codes: A61M 5/158 Needles for infusions; Accessories therefor, e.g. for inserting infusion needles, or for holding them on the body
• CPC Class Codes: A61M 5/1684 by detecting the amount of infusate remaining, e.g. signalling end of infusion
• CPC Class Codes: A61M 5/20 Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically A61M5/142 , A61M5/46 take precedence; hypodermic projectiles F42B12/54

Abstract

A puncture device comprising a hollow needle, a fixing portion fixed to the hollow needle, a sheath portion covering a part/entirety of the hollow needle and including a plastically deformable elongating member, a holding portion holding the hollow needle and the sheath portion in an integrated manner, with the holding portion positioned between the tip portion of the hollow needle and the plastically deformable elongating member, a holding release mechanism that releases the holding of the holding portion between the hollow needle and the sheath portion after the hollow needle and the sheath portion puncture the living body. The sheath portion elongates and is held in an elongated condition when the holding portion moves by the holding release mechanism, or when the holding of the hollow needle using the holding portion in an integrated manner is released, and the elastic portion contracts.

Claims

1. A puncture device comprising:

a hollow needle possessing both a tip portion configured to puncture a living body and an elastic portion;

a fixing portion fixed to a part of the hollow needle so that the part of the hollow needle is a fixed part of the hollow needle, the fixed part of the hollow needle being positioned on a side of the elastic portion opposite the tip portion so that the elastic portion is located axially between the tip portion and the fixed part;

a sheath portion covering a part of or entirety of the hollow needle from the fixed part to the tip portion, the sheath portion including a plastically deformable elongating member, one end of the sheath portion being located closer to the fixing portion than the tip portion and being fixed to the hollow needle without any gap between an outer periphery of the hollow needle and an inner periphery of the sheath portion;

a holding portion holding the hollow needle and the sheath portion in an integrated manner, the holding portion being positioned between the tip portion of the hollow needle and the plastically deformable elongating member;

a holding release mechanism that releases the holding of the holding portion between the hollow needle and the sheath portion after the tip portion of the hollow needle and the sheath portion are punctured into the living body by moving the holding portion in a direction causing the elastic portion to extend; and

wherein the sheath portion elongates and is held in an elongated condition when the holding portion moves by the holding release mechanism, or when the holding of the hollow needle using the holding portion in an integrated manner is released, and the elastic portion contracts.

2. The puncture device according to claim 1, wherein the sheath portion comprises:

a sheath covering a part of the hollow needle including the tip portion and a portion of the hollow needle on a tip portion side with respect to the elastic portion; and

the elongating member covers the elastic portion of the hollow needle and has one end connected to the sheath; and

the holding portion is fixed to the sheath.

3. The puncture device according to claim 1, wherein the sheath portion covers the hollow needle from a position distal to where the hollow needle is fixed to the fixing portion to the tip portion, and the holding portion is fixed to the sheath portion.

4. The puncture device according to claim 1, wherein the sheath portion comprises:

a sheath that covers the tip portion of the hollow needle as well as a portion of the hollow needle on a tip portion side of the elastic portion, and

the elongating member possessing one end connected to the sheath portion and completely covering the elastic portion.

5. The puncture device according to claim 1, comprising:

a liquid-medicine storage portion configured to store liquid medicine; and

the hollow needle being in communication with the liquid-medicine storage portion and forming a flow channel through which the liquid medicine stored in the liquid-medicine storage portion flows.