Needle assembly for visualization of fluid movement

Abstract

The needle assembly of the catheter system may include one or more features to facilitate flashback confirmation of a catheter procedure while preventing the buildup of positive pressure in the flashback chamber of the needle assembly. The needle assembly may include a plug, which may include a bore for receiving an introducer needle. The proximal opening of the introducer needle may be accessible from the proximal end of the needle hub. The plug may include a vent between an outer surface of the plug and an inner surface of the needle hub to prevent the buildup of positive pressure. The plug may include an extended distal end that reduces the volume of the flashback chamber. The plug may include a window in fluid communication with a notch in the introducer needle. Blood may flow from the notch through the window in the plug into a flashback chamber having a reduced volume.

Claims

1. The needle assembly, A needle hub configured to be coupled to a catheter assembly, wherein the needle assembly comprises a proximal end, a terminal end, and an internal interposed therebetween, the proximal end of the needle hub having a proximal opening, and the terminal end of the needle hub having a terminal opening, A plug comprising an outer surface, an end portion, a base end portion, and a hole connecting the end portion and the base end portion of the plug, wherein the outer surface comprises a first portion that contacts the inner surface of the interior, the first portion comprises a vent extending between the end portion and the base end portion of the plug and providing a fluid passage between the outer surface and the inner surface of the interior, the fluid passage connecting the interior and the base opening of the needle hub, An introduction needle comprising a terminal end and a base end, wherein the base end of the introduction needle is fixed to the base end of the needle hub through the hole, the terminal end of the introduction needle extends beyond the terminal end of the needle hub, the base opening of the introduction needle is accessible at the base end of the needle hub, and a guide wire is screwed in through the base opening of the introduction needle and through the lumen of the introduction needle and extends through the terminal opening of the introduction needle, and the introduction needle comprises a notch that forms a passage through the side wall of the introduction needle to fluidly communicate with the lumen, and A flashback chamber that communicates fluidly with the notch and defines the space between the inner surface and the second portion of the outer surface, A needle assembly comprising:

2. The needle assembly according to claim 1, wherein the flashback chamber is positioned between the end of the plug and the end of the needle hub.

3. The needle assembly according to claim 1, wherein the fluid passage has a cross-sectional area that allows the passage of air rather than blood.

4. The aforementioned cross-sectional area is between 0.00064516 and 0.00193548 cm². ２ (0.0001 to 0.0003 inches) ２ The needle assembly according to claim 3.

5. The needle assembly according to claim 1, wherein the first portion of the outer surface comprises a plurality of vents, each of which provides a fluid passage between the first portion of the outer surface and the inner surface inside.

6. The needle assembly according to claim 1, further comprising a fluid-tight seal between the terminal end of the plug and the inner surface inside.

7. The needle assembly according to claim 6, wherein the terminal end of the plug has a window that communicates fluidly with the flashback chamber.

8. The needle assembly according to claim 7, wherein the notch is located within the window and the notch is in fluid communication with the flashback chamber through the window.

9. The needle assembly according to claim 7, further comprising a fluid-tight seal between the outer surface of the introduction needle and the hole.

10. The needle assembly according to claim 1, wherein the second portion of the outer surface has an outer diameter smaller than the inner diameter of the interior.

11. The needle assembly according to claim 1, wherein the notch is located within the flashback chamber.

12. The needle assembly according to claim 1, wherein the terminal end of the plug is chamfered inward.

13. The needle assembly according to claim 1, further comprising a fluid-tight seal between the outer surface of the introduction needle and the hole.

14. The needle assembly according to claim 1, further comprising a gap between the base end of the plug and the inner surface of the needle hub adjacent to the base opening.

15. The needle assembly according to claim 14, wherein the gap is interposed between the vent and the base end opening of the needle hub.

16. A guidewire-assisted catheter system A catheter assembly comprising a catheter adapter that constitutes a catheter extending from the terminal end of the catheter adapter to the terminal end, and The needle assembly according to claim 1, A guidewire-assisted catheter system equipped with the following features.

17. The guidewire-assisted catheter system according to claim 16, wherein the fluid passage has a cross-sectional area that allows the passage of air rather than blood.

18. The aforementioned cross-sectional area is between 0.00064516 and 0.00193548 cm². ２ (0.0001 to 0.0003 inches) ２ The guidewire-assisted catheter system according to claim 17.

19. The guidewire-assisted catheter system according to claim 16, further comprising a fluid-tight seal between the terminal end of the plug and the inner surface inside.

20. The guidewire-assisted catheter system according to claim 19, wherein the terminal end of the plug has a window that communicates fluidly with the flashback chamber.

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