Barrier devices, systems, and methods
The present disclosure relates generally to the field of medical devices and medical device delivery. In particular, the present disclosure relates to medical devices, systems, and methods for delivering a barrier device within a body lumen of a patient, such as the GI tract. For example, a barrier device may include a distal self-expanding stent. A tubular barrier may have a proximal end, a distal end, and a lumen extending therethrough. The distal stent may be disposed at the distal end of the tubular barrier. An anchoring self-expanding stent may be disposed at the proximal end of the tubular barrier.
1. A barrier device, comprising:
a distal self-expanding stent having an outer surface extending between a proximal end and a distal end, and a ring spaced proximally from the distal end and extending circumferentially around and radially outwardly from the outer surface of the stent;
a tubular barrier having a proximal end, a distal end, and a lumen extending therethrough, the distal stent disposed at the distal end of the tubular barrier; and
an anchoring self-expanding stent disposed at the proximal end of the tubular barrier and shaped to mimic the contour of the anatomy at which the anchoring self-expanding stent is to be anchored;
wherein the outer surface of the distal self-expanding stent is similarly shaped to a bolus of stomach materials and configured to get distally translated through the intestine, with the tubular barrier in tow, due to peristaltic waves generated by contraction of smooth muscles of the intestine against the outer surface of the distal self-expanding stent.
2. The device of claim 1 , wherein the barrier device further comprises at least one intermediate self-expanding stent between the proximal end and the distal end of the tubular barrier.
3. The device of claim 1 , wherein the tubular barrier covers substantially all of the distal stent and the anchoring stent.
4. The device of claim 1 , wherein the anchoring stent has a shape-memory in an expanded configuration that substantially mimics a contour of an anatomy of a gastric outlet.
5. The device of claim 1 , wherein the distal self-expanding stent comprises a shape-memory material.
6. The device of claim 1 , further comprising a helical wire extending about the lumen of the tubular barrier.
7. The device of claim 1 , further comprising a plurality of nanofibers throughout a wall of the tubular barrier.
8. The device of claim 1 , further comprising an anchoring protrusion extending from an outer surface of the anchoring stent.
9. The device of claim 1 , wherein the tubular barrier is semi-permeable.
10. The device of claim 1 wherein the tubular barrier is substantially impermeable.
11. A barrier system, comprising:
a catheter including an outer sheath and an inner sheath; and
a barrier device slidably disposed within the outer sheath in a delivery configuration, comprising:
a tubular barrier having a proximal end and a distal end; and
a distal self-expanding stent at the distal end of the tubular barrier;
an anchoring self-expanding stent disposed at the proximal end of the tubular barrier;
wherein the inner sheath is disposed within the tubular barrier in the delivery configuration and has a distally tapered distal end having a proximal diameter substantially as wide as the outer sheath to constrain the barrier device within the outer sheath and from sliding distally out of the outer sheath, and at least one radial extension along its length to assist in preventing translation of the barrier device during delivery.
12. The system of claim 11 , wherein the barrier device further comprises at least one intermediate self-expanding stent between the proximal end and the distal end of the tubular barrier.
13. The system of claim 12 , wherein the barrier device further comprises a radial extension proximal to each of the distal self-expanding stent and the at least one intermediate self-expanding stent.
14. The system of claim 12 , wherein the at least one intermediate self-expanding stent has a ring-like structure in an expanded configuration.
15. The system of claim 11 , wherein the distal end of the inner sheath has a diameter substantially as wide as the catheter.
16. A method for delivering a barrier device, comprising:
delivering a distal self-expanding stent disposed at a distal end of a tubular barrier of the barrier device within a body lumen of a patient, the distal self-expanding stent having an outer surface extending between a proximal end and a distal end and a ring extending circumferentially around and radially outwardly from the outer surface of the stent;
delivering at least a portion of the tubular barrier within the body lumen; and
translating the distal self-expanding stent and the portion of the tubular barrier along the body lumen of the patient via peristalsis and contact of the radially-outwardly extending ring with the peristaltically contracting muscles.
17. The method of claim 16 , further comprising positioning an anchoring self-expanding stent disposed at a proximal end of the tubular barrier device within an organ of the patient.
18. The method of claim 17 , wherein the body lumen is the GI tract and the organ is the gastric outlet of the stomach.
19. The method of claim 16 , wherein the barrier device is constrained within a sheath of a catheter in a delivery configuration and delivering the self-expanding stent comprises proximally retracting the sheath of the catheter from about the self-expanding stent.
20. The method of claim 18 , wherein the patient is obese and delivering the at least a portion of the tubular barrier within the GI tract affects weight loss.