Pyloric anchor retrieval tools and methods

Inventors

Stangenes, Todd • Schwarz, Werner • Belhe, Kedar R. • Ziebol, Mathew • Anderson, Edward

Assignees

MetaModix Inc

Abstract

A retrieval device comprising a hook assembly and a capsule assembly. The hook assembly has an attachment feature at a first end. The capsule assembly includes a capsule, a capsule shaft, and a handle connected in series and defining an inner bore. The capsule has a first end defining an opening. The inner bore of the capsule assembly is configured to slidably receive the hook assembly. The handle has a central portion, a first extension portion attached to the capsule shaft, and a second extension portion with a hook assembly lock at a second end. The hook assembly lock is configured to lock the hook assembly to the second extension portion. The second extension portion is configured to pull the hook assembly relative to the capsule shaft, and the first extension portion is configured to push the capsule shaft relative to the hook assembly along the central longitudinal axis.

Core Innovation

The invention relates to an endoscopic retrieval device and methods for retrieving an object or medical device from within a body of a patient. A hook assembly having an attachment feature is operably coupled to a capsule assembly that includes a capsule, a capsule shaft, and a handle connected in series defining an inner bore along a central longitudinal axis. The inner bore slidably receives the hook assembly while the capsule and handle transition between retracted and extended configurations.

The hook assembly is locked to the handle using a hook assembly lock at a second extension portion of the handle. Transitioning the handle between the retracted configuration and the expanded configuration slides the hook assembly relative to the capsule shaft along the central longitudinal axis, so that the handle draws the attachment feature into the capsule. In the same transition, the first extension portion pushes the capsule shaft relative to the hook assembly along the central longitudinal axis.

Control of the translation is provided by a first control knob and a second control knob configured to transition the first and second extension portions between the retracted configuration and the extended configuration. Related structural embodiments include a capsule with an opening to an inside of the capsule, a closely packed coil, and an incompressible capsule along the central longitudinal axis. Related embodiments further include a hook assembly with a sheath and a cable, where the cable is slidably received within the lumen of the sheath and is locked to inhibit longitudinal motion of the cable relative to the sheath.

Claims Coverage

The partial content includes three independent claims: a retrieval device, a retrieval device for retrieving an object, and a method of extracting a medical device. Across these claims, the inventive features center on a locked hook-and-capsule mechanism with handle-driven retracted-to-expanded transitions and knob-driven translation along a central longitudinal axis.

Across the independent claims, the core inventive coverage is directed to a retrieval system where a hook assembly with an attachment feature is locked to a handle, handle retraction/expansion slides the hook relative to a capsule shaft while drawing the attachment feature into the capsule and pushing the capsule shaft, and first and second control knobs provide controlled translation along a longitudinal or central longitudinal axis. A related independent claim further specifies a sheath-and-cable structure that inhibits unwanted longitudinal motion of the cable relative to the sheath.

Stated Advantages

Documented Applications