Method of indwelling a needle assembly

• US 9,265,915 B2
• Filed: 09/26/2014
• Issued: 02/23/2016
• Est. Priority Date: 03/26/2010
• Status: Active Grant

• Current Assignee: Terumo Kabushiki Kaisha (Terumo Corporation)
• Original Assignee: Terumo Kabushiki Kaisha (Terumo Corporation)
• Inventors: Ishida, Masahiro
• Primary Examiner(s): STIGELL, THEODORE J
• Application Number:
  US14/497,364
• Publication Number:
  US 20150133893A1
• Time in Patent Office: 515 Days
• US Class Current: 1/1
• CPC Class Codes: A61M 2005/1585 Needle inserters
• CPC Class Codes: A61M 2005/1587 suitable for being connected to an infusion line after insertion into a patient
• CPC Class Codes: A61M 25/0606 "Over-the-needle" catheter assemblies, e.g. I.V. catheters
• 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

A method of indwelling a needle assembly includes providing an assembled indwelling needle assembly having an inner needle, an inner needle hub fixed to a proximal portion of the inner needle, a hollow outer needle in which the inner needle is inserted, an outer needle hub fixed to a proximal portion of the outer needle, and a pressing member; pressing down on the pressing member while moving the indwelling needle assembly to puncture a blood vessel; advancing the outer needle along the inner needle such that the outer needle is inserted in the blood vessel; holding the pressing member against the outer needle and holding the outer needle hub such that the outer needle is maintained indwelling in the blood vessel while simultaneously pulling the inner needle hub in a proximal direction such that the inner needle is pulled out from and entirely removed from the outer needle.

Claims

1. A method of indwelling a needle assembly comprising:

providing an assembled indwelling needle assembly including;

an inner needle having a sharp needlepoint at a distal end;

an inner needle hub fixed to a proximal portion of the inner needle;

a hollow outer needle in which the inner needle is inserted;

an outer needle hub fixed to a proximal portion of the outer needle; and

a pressing member, which presses an intermediate portion of the outer needle between a proximal end and a distal end;

arranging the indwelling needle assembly into a first position wherein the pressing member is disposed along an axis of the outer needle;

moving a distal portion of the indwelling needle assembly to puncture a blood vessel of the patient with the sharp needlepoint of the inner needle with the pressing member contacting the intermediate portion of the outer needle;

advancing the outer needle in a distal direction along the inner needle such that the intermediate portion of the outer needle is inserted into the blood vessel and a distal portion of the outer needle is inserted to a target position in the blood vessel; and

holding the outer needle or the outer needle hub such that the outer needle is maintained indwelling in the blood vessel while simultaneously pulling the inner needle hub in a proximal direction such that the inner needle is pulled out from and entirely removed from the outer needle;

wherein the advancing step includes first pushing the pressing member so as to advance the outer needle a minute distance and then, while holding the inner needle hub in a fixed position, gripping the outer needle hub and pushing the outer needle hub in a distal direction, thereby further advancing the outer needle along the inner needle.

2. The method according to claim 1, wherein the pressing member includes a main body and a finger hook projection.

3. The method according to claim 2, wherein the finger hook projection includes a plurality of finger hook projections, the advancing step includes first pushing a distal-most finger hook projection in the distal direction so as to advance the outer needle a minute distance in the distal direction and then, pushing a second distal-most finger hook projection in the distal direction so as to further advance the outer needle in the distal direction, thereby further advancing the outer needle along the inner needle.

4. The method according to claim 1, further comprising displacing the pressing member into a second position where the pressing member is pivoted relative to the outer needle.

5. The method according to claim 1, further comprising bending the pressing member in a direction for coming away from the outer needle.

6. The method according to claim 1, further comprising detaching the pressing member from the outer needle hub.

7. The method according to claim 1, wherein the pressing member includes a slip-off preventive means for preventing the outer needle from coming out of position in a direction perpendicular to the axis of the outer needle.

8. The method according to claim 1, wherein the pressing member has an elongated main body section and a pressing section provided on a distal side relative to the proximal portion of the main body section such that the pressing section presses the outer needle.

9. The method according to claim 8, wherein the pressing member is movable between a position in which the pressing section contacts the outer needle and a position in which the pressing section moves away from contact with the outer needle.

10. The method according to claim 8, wherein the advancing step is conducted in a state in which the pressing section does not contact the intermediate portion of the outer needle.

11. A method of indwelling a needle assembly comprising:

providing an assembled indwelling needle assembly including;

an inner needle having a sharp needlepoint at a distal end;

an inner needle hub fixed to a proximal portion of the inner needle;

a hollow outer needle in which the inner needle is inserted;

an outer needle hub fixed to a proximal portion of the outer needle;

a pressing member, which presses an intermediate portion of the outer needle between a proximal end and a distal end; and

a grip member having a proximal portion connected to the inner needle hub;

arranging the indwelling needle assembly into a first position wherein the pressing member is disposed along an axis of the outer needle;

moving a distal portion of the indwelling needle assembly to puncture a blood vessel of the patient with the sharp needlepoint of the inner needle with the pressing member contacting the intermediate portion of the outer needle;

advancing the outer needle in a distal direction along the inner needle such that the intermediate portion of the outer needle is inserted into the blood vessel and a distal portion of the outer needle is inserted to a target position in the blood vessel; and

pulling a proximal portion of the grip member and the inner needle hub in a proximal direction such that the inner needle is pulled out from and entirely removed from the outer needle;

wherein the advancing step includes first pushing the pressing member so as to advance the outer needle a minute distance and then, while holding the inner needle hub in a fixed position, gripping the outer needle hub and pushing the outer needle hub in a distal direction, thereby further advancing the outer needle along the inner needle.

12. The method according to claim 11, wherein the pressing member is contained in the grip member.

13. The method according to claim 11, wherein the pressing member includes a main body and a finger hook projection.

14. The method according to claim 13, wherein the finger hook projection includes a plurality of finger hook projections, said advancing step includes first pushing a distal-most finger hook projection in the distal direction so as to advance the outer needle a minute distance in the distal direction and then, pushing a second distal-most finger hook projection in the distal direction so as to further advance the outer needle in the distal direction, thereby further advancing the outer needle along the inner needle.

15. The method according to claim 14, wherein the advancing step further includes sequentially pushing a next distal-most finger hook projection of the plurality of finger hook projections in the distal direction so as to further advance the outer needle in the distal direction and thereby further advancing the outer needle along the inner needle, until the distal portion of the outer needle is inserted to a target position in the blood vessel.

16. The method according to claim 11, further comprising displacing the pressing member into a second position where the pressing member is pivoted from the outer needle.

17. The method according to claim 11, further comprising bending the pressing member in a direction for coming away from the outer needle.

18. The method according to claim 11, further comprising detaching the pressing member from the outer needle hub.

19. The method according to claim 11, wherein the pressing member include a slip-off preventive means for preventing the outer needle from coming out of position in a direction perpendicular to the axis of the outer needle.

20. The method according to claim 11, wherein the pressing member has an elongated main body section and a pressing section provided on a distal side relative to the proximal portion of the main body section such that the pressing section presses the outer needle.

21. The method according to claim 20, wherein the pressing member is movable between a position in which the pressing section contacts the outer needle and a position in which the pressing section moves away from contact with the outer needle.

22. The method according to claim 20, wherein the advancing step is conducted in a state in which the pressing section does not contact the intermediate portion of the outer needle.

23. A method of indwelling a needle assembly comprising:

providing an assembled indwelling needle assembly including;

an inner needle having a sharp needlepoint at a distal end;

an inner needle hub fixed to a proximal portion of the inner needle;

a hollow outer needle in which the inner needle is inserted;

an outer needle hub fixed to a proximal portion of the outer needle; and

a pressing member, which extends from the outer needle hub and presses an intermediate portion of the outer needle between a proximal end and a distal end;

arranging the indwelling needle assembly into a first position wherein the pressing member is disposed along an axis of the outer needle;

moving a distal portion of the indwelling needle assembly to puncture a blood vessel of the patient with the sharp needlepoint of the inner needle with the pressing member contacting the intermediate portion of the outer needle;

advancing the outer needle in a distal direction along the inner needle such that the intermediate portion of the outer needle is inserted into the blood vessel and a distal portion of the outer needle is inserted to a target position in the blood vessel; and

holding the outer needle or the outer needle hub such that the outer needle is maintained indwelling in the blood vessel while simultaneously pulling the inner needle hub in a proximal direction such that the inner needle is pulled out from and entirely removed from the outer needle.