Flushing stylet

1. A stylet comprising:

an elongate body defining a passage and a plurality of apertures in fluid communication with the passage;

a first blocking dam secured to the elongate body entirely proximal to the plurality of apertures; and

a second blocking dam secured to the elongate body entirely distal to the plurality of apertures, wherein the first and second blocking dams each defines a D-shaped cross-section,

wherein the first and second blocking dams are circumferentially aligned, and

wherein the elongate body is configured to be movable within a lumen of a catheter to a position in which the first and second blocking dams are, respectively, proximal and distal to a side opening of the catheter and each of the first and second blocking dams is sealingly engageable with an inner surface of the catheter such that fluid introduced into the lumen of the catheter, from the passage and through the plurality of apertures of the stylet, is directed through the side opening of the catheter.

2. The stylet of claim 1 , wherein the plurality of apertures includes apertures axially aligned with one another along a longitudinal axis of the elongate body.

3. The stylet of claim 1 , wherein the plurality of apertures includes apertures disposed about a circumference of the elongate body.

4. The stylet of claim 1 , wherein the plurality of apertures includes apertures circumferentially and axially offset from each other.

5. The stylet of claim 1 , wherein each of the first and second blocking dams includes an arcuate outer wall configured to engage with the inner surface of the catheter.

6. The stylet of claim 1 , wherein each of the first and second blocking dams has a lubricous coating.

7. The stylet of claim 1 , wherein the elongate body includes a closed distal end.

8. The stylet of claim 1 , further comprising a marker band extending around at least a portion of a circumference of the elongate body.

9. The stylet of claim 1 , wherein the first and second blocking dams are formed from a material more radiopaque than the elongate body.

10. The stylet of claim 1 , wherein the elongate body defines a D-shaped cross-section.

11. The stylet of claim 1 , wherein the elongate body defines a circular cross-section.

12. The stylet of claim 1 , wherein at least one of the first blocking dam or the second blocking dam only partially encircles an outer perimeter of the elongate body.

13. The stylet of claim 1 , wherein the first blocking dam or the second blocking dam fully encircles an outer perimeter of the elongate body.

14. The stylet of claim 1 , wherein each of the first and second blocking dams is formed from polyurethane, polypropylene, nylon, synthetic rubber, or natural rubber.

15. The stylet of claim 1 , wherein at least one of the first blocking dam or the second blocking dam is monolithically formed with the elongate body.

16. The stylet of claim 1 , wherein at least one of the first blocking dam or the second blocking dam is welded or adhered to the elongate body.

17. A system comprising:

the stylet of claim 1 ;

a fluid source; and

the catheter, wherein the elongate body of the stylet is configured to fluidically connect to the fluid source and deliver the fluid from the fluid source to the lumen of the catheter via the passage and the plurality of apertures.

18. A system comprising

the catheter defining the lumen, wherein the lumen is D-shaped; and

the stylet of claim 1 , wherein the first and second blocking dams conform to the D-shaped lumen and are configured to retain fluid between the first and second blocking dams when the elongate body and the first and second blocking dams are inserted in the lumen of the catheter.

19. A stylet comprising:

an elongate body defining a passage and a plurality of apertures in fluid communication with the passage;

a first blocking dam secured to the elongate body entirely proximal to the plurality of apertures; and

a second blocking dam secured to the elongate body entirely distal to the plurality of apertures, wherein each of the first and second blocking dams only partially encircles an outer perimeter of the elongate body,

wherein the first and second blocking dams are circumferentially aligned, and

wherein the elongate body is configured to be movable within a lumen of a catheter to a position in which the first and second blocking dams are, respectively, proximal and distal to a side opening of the catheter and each of the first and second blocking dams is sealingly engageable with an inner surface of the catheter such that fluid introduced into the lumen of the catheter, from the passage and through the plurality of apertures of the stylet, is directed through the side opening of the catheter.

20. A system comprising:

a catheter defining a lumen and a side opening, wherein the lumen is D-shaped; and

a stylet comprising:

an elongate body defining a passage and a plurality of apertures in fluid communication with the passage;

a first blocking dam secured to the elongate body proximal to the plurality of apertures; and

a second blocking dam secured to the elongate body distal to the plurality of apertures, wherein the first and second blocking dams each defines a D-shaped cross-section,

wherein the elongate body is configured to be movable within the lumen of the catheter to a position in which the first and second blocking dams are, respectively, proximal and distal to the side opening of the catheter and each of the first and second blocking dams is sealingly engageable with an inner surface of the catheter such that fluid introduced into the lumen of the catheter, from the passage and through the plurality of apertures of the stylet, is directed through the side opening of the catheter, and

wherein the first and second blocking dams conform to the D-shaped lumen and are configured to retain fluid between the first and second blocking dams when the elongate body and the first and second blocking dams are inserted in the lumen of the catheter.