Subcutaneous vascular access ports

1. A vascular access port comprising:

a base that extends in a longitudinal direction and in a transverse direction, wherein the longitudinal direction of the base is configured to run substantially parallel to a lumen of a vessel when the vascular access port is attached to the vessel, and wherein the base comprises a bottom surface that is configured to face the vessel when the vascular access port is coupled to the vessel;

an opening in the bottom surface of the base; and

a passageway that extends through the base and comprises a proximal end and a distal end,

wherein the proximal end of the passageway comprises an entry mouth that is configured to be positioned beneath a surface of the skin of a patient when the vascular access port has been implanted in the patient, wherein the entry mouth is open to permit one or more needles to be inserted individually through the passageway,

wherein the distal end of the passageway comprises the opening in the bottom surface of the base to permit the one or more needles to pass through the opening and through a specific region of the vessel when the vascular access port is coupled to the vessel, and

wherein the vascular access port is configured to permit movement of the one or more needles through the vascular access port and through the opening in the bottom surface of the base without any portion of the vascular access port moving relative to other portions of the vascular access port.

2. The vascular access port of claim 1 , wherein the opening is elongated in the longitudinal direction so as to extend in the longitudinal direction to a greater extent than the opening extends in the lateral direction.

3. The vascular access port of claim 2 , wherein the passageway is configured to constrain movement of the one or more needles inserted individually therethrough along a path that is both nonparallel and non-orthogonal to a longitudinal line along the bottom surface of the base.

4. The vascular access port of claim 1 , wherein the passageway comprises a channel that defines a constant inner diameter, and wherein a distal end of the channel comprises the opening in the bottom surface of the base.

5. The vascular access port of claim 4 , wherein the passageway further comprises a funnel region that narrows from the entry mouth in a distal direction, and wherein a forward end of the funnel region transitions into the channel.

6. The vascular access port of claim 1 , wherein the passageway comprises a funnel region that narrows from the entry mouth in a distal direction.

7. The vascular access port of claim 1 , wherein the entry mouth of the passageway is larger than the opening in the bottom surface of the base.

8. The vascular access port of claim 1 , wherein the base comprises a plurality of attachment passages that are spaced from the opening in the bottom surface of the base.

9. The vascular access port of claim 8 , wherein the plurality of attachment passages encompass the opening in the bottom surface of the base.

10. The vascular access port of claim 1 , wherein the base is elongated in the longitudinal direction so as to extend in the longitudinal direction to a greater extent than the base extends in the lateral direction.

11. The vascular access port of claim 1 , wherein the base is configured to be bowed in the transverse direction when the vascular access port is attached to the vessel so as to conform to a contour of a wall of the vessel.

12. The vascular access port of claim 11 , wherein the base is rigid.

13. The vascular access port of claim 1 , further comprising a body that extends upwardly from the base, wherein the passageway extends through the body.

14. The vascular access port of claim 13 , wherein passageway comprises a funnel region, and wherein a base surface of the funnel region projects rearwardly relative to the opening and flares outwardly in the rearward direction relative to a central vertical plane of the vascular access port.

15. The vascular access port of claim 1 , further comprising a palpation projection that extends about at least a portion of the passageway.

16. The vascular access port of claim 15 , wherein the palpation projection extends about at least a portion of the proximal end of the passageway and substantially defines a plane.

17. The vascular access port of claim 15 , wherein the palpation projection extends upwardly over a portion of the passageway.

18. The vascular access port of claim 1 , wherein the bottom surface of the vascular access port comprises an ingrowth-inducing covering.

19. The vascular access port of claim 1 , wherein the vascular access port is formed as a single unitary piece of a single material.

20. The vascular access port of claim 1 , wherein the vascular access port is coupled to the vessel, and wherein the vessel comprises an artificial graft.

21. A vascular access port comprising:

a base that extends in a longitudinal direction and in a transverse direction, wherein the longitudinal direction of the base is configured to run substantially parallel to a lumen of a vessel when the vascular access port is attached to the vessel, and wherein the base comprises a bottom surface that is configured to face the vessel when the vascular access port is coupled to the vessel;

an opening in the bottom surface of the base; and

a passageway that extends through the base and comprises a proximal end and a distal end,

wherein the proximal end of the passageway comprises an entry mouth that is configured to be positioned beneath a surface of the skin of a patient when the vascular access port has been implanted in the patient, wherein the entry mouth is open to permit one or more needles to be inserted individually through the passageway,

wherein the distal end of the passageway comprises the opening in the bottom surface of the base to permit the one or more needles to pass through a specific region of the vessel when the vascular access port is coupled to the vessel, and

wherein the vascular access port is formed as a single unitary piece of a single material.