Increased drainage and decreased internal stress ureteral stent design
A ureteral stent may comprise an elongate member with an internal-luminal space. The member may have at least one end coiled in a pigtail-shape, a substantially straight portion, and a plurality of side ports wherein the plurality of side ports are located only in the substantially straight portion and are disposed along a spiral or helix where each side port is located radially and longitudinally offset relative to each adjacent side port.
1 . A stent comprising:
an elongate member comprising a monolithic body defining a single lumen and comprising:
a first coil section defining a coil section lumen and comprising a first substantially helical coil;
a first substantially straight section defining a first substantially straight section lumen continuous with the coil section lumen, the first substantially straight section extending from the first substantially helical coil and having a first length;
a second substantially straight section defining a second substantially straight section lumen continuous with the first substantially straight section lumen, the second substantially straight section extending from the first substantially straight section and having a second length longer than the first length; and
a plurality of side ports in each of the first and second substantially straight sections, wherein a first density of the plurality of side ports in the first substantially straight section is greater than a second density of the plurality of side ports in the second substantially straight section;
wherein each of the plurality of side ports on the second substantially straight section is offset rotated from about 30° to about 90° relative to each adjacent side port;
wherein each of the plurality of side ports is located only on the substantially straight sections; and
wherein the single lumen comprises the coil section lumen, the first substantially straight section lumen, and the second substantially straight section lumen.
2 . The stent of claim 1 , wherein the plurality of side ports on the first substantially straight section includes three to ten side ports.
3 . The stent of claim 1 , wherein each of the plurality of side ports on the first substantially straight section is longitudinally spaced 5 mm apart from each other.
4 . The stent of claim 1 , wherein each of the plurality of side ports on the second substantially straight section is offset rotated 90° relative to each adjacent side port.
5 . The stent of claim 1 , wherein each of the plurality of side ports on the second substantially straight section is spaced 3 cm longitudinally apart from adjacent side port(s).
6 . The stent of claim 1 , wherein the elongate member further comprises:
a second coil section defining a lumen and comprising a second substantially helical coil; and
a third substantially straight section defining a lumen and located between the second substantially straight section and the second coil section.
7 . The stent of claim 6 , further comprising a plurality of side ports in the third substantially straight section;
wherein each of the plurality of side ports on the third substantially straight section is spaced 5 mm longitudinally apart from adjacent side port(s).
8 . The stent of claim 1 , wherein the plurality of side ports in the first substantially straight section have more drainage activity than the plurality of side ports in the second substantially straight section.
9 . The stent of claim 8 , wherein no side ports are disposed along the first substantially helical coil.
10 . The stent of claim 1 , wherein no side ports are disposed along the first substantially helical coil.
11 . A stent comprising:
an elongate tubular member comprising a monolithic body defining a single lumen and comprising:
a first coil section defining a first coil section lumen and comprising a first coil;
a second coil section defining a second coil section lumen and comprising a second coil;
a first substantially straight section defining a first substantially straight section lumen continuous with the first coil section lumen, the first substantially straight section extending from the first coil section and configured for placement in a kidney-ureter junction of a patient;
a second substantially straight section extending from the first substantially straight section and defining a second substantially straight section lumen continuous with the first substantially straight section lumen;
a third substantially straight section located between the second coil section and the second substantially straight section and configured for placement in a ureter-bladder junction of the patient;
a plurality of active side ports in the first substantially straight section;
a plurality of side ports in the second and third substantially straight sections, wherein the plurality of side ports in the second substantially straight section have less drainage activity than the plurality of active side ports in the first substantially straight section, the plurality of side ports located on the second and third substantially straight sections;
wherein each of the plurality of side ports along the second substantially straight section is offset rotated from about 30° to about 90° relative to each adjacent side port;
wherein the plurality of active side ports in the first substantially straight section are configured to provide increased drainage activity in the kidney-ureter junction of the patient;
wherein the first and third substantially straight sections are shorter than the second substantially straight section; and
wherein the single lumen extends continuously through the first coil section, the first, second, and third substantially straight sections, and the second coil section, as well as also communicating with an exterior of the elongate tubular member through the side ports.
12 . The stent of claim 11 , wherein at least some of the plurality of side ports are uniformly spaced away from each other.
13 . The stent of claim 11 , wherein the plurality of side ports along the first substantially straight section includes three to ten side ports.
14 . The stent of claim 11 , wherein at least some of the plurality of side ports are spaced away from each other by about 5 mm to about 3 cm.
15 . The stent of claim 11 , wherein at least some of the plurality of side ports are more closely spaced away from each other along the first and third substantially straight sections than along the second substantially straight section.
16 . The stent of claim 11 , wherein no side ports are disposed along the first coil.
17 . The stent of claim 16 , wherein no side ports are disposed along the second coil.
18 . A ureteral stent comprising:
an elongate tubular member comprising a monolithic body defining a single lumen and comprising:
a first coil configured for placement in a kidney of a patient;
a first section extending from the coil and configured for placement in a kidney-ureter junction of the patient;
a second section extending from the first section having a length longer than the first section and configured for placement in the ureter of the patient;
a first plurality of active side ports in the first section, each side port of the first plurality of side ports in communication with the single lumen; and
a second plurality of side ports in the second section having less drainage activity than the first plurality of active side ports in the first section, each side port of the second plurality of side ports in communication with the single lumen;
wherein the active side ports in the first section provide increased drainage in the kidney-ureter junction region;
wherein at least one side port in the first section is configured to have more drainage activity than at least one other side port in the first section;
wherein each of the second plurality of side ports on the second section is offset rotated from about 30° to about 90° relative to each adjacent side port.