Intraluminal stent with handle for treating benign prostatic hyperplasia

Inventors

Kadlec, Adam • Doraiswamy, Anand • Schieber, Andrew • Souza, Marcus • Chu, Nathan

Assignees

Rivermark Medical Inc

Abstract

A stent is disclosed that is configured to maintain patency of the prostatic urethra despite an enlarged prostate. The stent can include a handle that, in an undeflected position, is disposed outside of the flow path of the stent. When the handle is pulled, the handle can deflect to generally aligned with a central axis of the stent. A capture device is disclosed that includes a tapered tip to navigate a working channel of a delivery device and a hook that can capture the stent handle and be moved into a tube to retain the stent handle to facilitate maneuvering of the stent in and out of the working channel of the delivery device. A loading adapter with a tapered port is disclosed that can be disposed on the delivery device to distribute compressive forces applied by the port on the stent during loading into the working channel.

Core Innovation

The invention relates to a device configured to maintain patency of a prostatic urethra using an intraluminal expandable prostatic urethral stent implanted in the prostatic urethra of a patient. The stent comprises a passageway between a proximal end and a distal end, and a peripheral wall disposed about the passageway, the peripheral wall comprising a plurality of struts and a plurality of nodes coupled to each other to form a plurality of cells.

The stent further includes a handle formed from a most distal strut, where the handle is biased to a first position such that the handle is substantially coplanar with the peripheral wall when viewed from an axial direction. While biased to the first position, the handle does not impede flow of the bodily fluid through the passageway, and the handle is configured to extend in a distal direction beyond a most distal cell when the stent is expanded and to engage a wall of the prostatic urethra.

The cells include diamond-shaped cells and parallelogram-shaped cells in a peripheral wall formed by the coupled struts and nodes. The handle is configured to be deflected from the first position to a second position closer to a central longitudinal axis of the stent when pulled in the distal direction, and the stent expands from a compressed configuration to an expanded configuration within the prostatic urethra.

The documented concepts also include loading and retraction of the stent into a working lumen of a delivery device. A handle formed from a most distal strut is coupled to a capture device, and the handle is pulled distally with the capture device to deflect the handle and retract the stent into the working lumen such that the stent compresses to a diameter of the working lumen.

Claims Coverage

The partial document includes three independent claims. They cover an expandable prostatic urethral stent with a biased deflectable distal handle, a stent with diamond-shaped and parallelogram-shaped cells and defined handle-to-cell spatial relationships, and a loading method coupling a capture device to the handle and retracting the stent into a delivery device working lumen for compression.

Across the independent claims, the core inventive coverage is an expandable intraluminal prostatic urethral stent that includes a distally projecting handle biased to a coplanar position to avoid impeding flow and configured to deflect closer to the stent’s central longitudinal axis upon distal pulling, with one claim set reciting diamond-shaped and parallelogram-shaped cells. A related independent method covers loading by coupling a capture device to the handle and retracting the stent into a delivery device working lumen to compress the stent to the working lumen diameter.

Stated Advantages

Documented Applications