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EP-4739227-A1 - CAPTURE BASKET FOR LASER LITHOTRIPSY

EP4739227A1EP 4739227 A1EP4739227 A1EP 4739227A1EP-4739227-A1

Abstract

Devices, systems, and methods for a retrieval device for addressing a kidney stone. A retrieval device includes an expandable basket with a deployed cover. The basket is expanded and maneuvered around the kidney stone. The cover is then deployed around the basket to contain the kidney stone for laser lithotripsy. Fragments at or below a target size are allowed to escape through apertures in the cover or are removed via a suction tube.

Inventors

  • ALTMAN, HERNAN
  • COHEN, ANAT

Assignees

  • Lumenis Ltd.

Dates

Publication Date
20260513
Application Date
20240705

Claims (15)

  1. 1. A retrieval device for addressing a kidney stone, comprising: an elongate member; a basket connected to a distal end of the elongate member, the basket moveable between a retracted position having a first diameter and an expanded position having a second diameter larger than the first diameter; and a cover connected to the basket, the cover deployable to form a barrier around the basket after the basket has moved into the expanded position and surrounded a kidney stone.
  2. 2. The retrieval device of claim 1, further comprising: a sheath sized to enclose the basket in the retracted position, wherein the basket exits the sheath when moving into the expanded position.
  3. 3. The retrieval device of claim 1, the basket comprising: a plurality of legs joined at a proximal end to the elongate member and at the distal end to an atraumatic tip.
  4. 4. The retrieval device of claim 3, further comprising: a plurality of strings connected to the cover, the strings running between the cover and the atraumatic tip of the basket such that pulling the strings deploys the cover.
  5. 5. The retrieval device of claim 4, wherein cover moves from a proximal end of the basket to the atraumatic tip to form the barrier around the basket.
  6. 6. The retrieval device of claim 1, further comprising: a plurality of strings connected to the cover, wherein the cover is deployed ahead of the basket such that pulling the strings moves the cover from a distal end of the basket to a proximal end of the basket to form a barrier around the basket.
  7. 7. The retrieval device of any one of claims 1-6, wherein the cover is water-permeable.
  8. 8. The retrieval device of any one of claims 1-7, wherein the cover comprises at least one sheet of biocompatible material.
  9. 9. The retrieval device of claim 8, wherein the biocompatible material is thermoplastic, plant fiber, or animal tissue.
  10. 10. The retrieval device of any one of claims 1-9, wherein the cover has a plurality of holes of a preselected size.
  11. 11. The retrieval device of claim 10, wherein the holes are between 1 mm and 5 mm in diameter.
  12. 12. The retrieval device of claim 10 or 11, wherein the cover is a wire mesh, the holes comprising spaces between wires of the mesh.
  13. 13. An endoscopic surgical device, comprising: an endoscope having an instrument channel; the retrieval device of any one of claims 1 to 12, wherein the first diameter of the basket of the retrieval device in the retracted position is less than an internal diameter of the instrument channel such that the retrieval device can be deployed into a patient’s body through the instrument channel of the endoscope; and a laser fiber suitable to deploy through the endoscope and insert into a working space formed by the expanded basket and deployed cover of the retrieval device.
  14. 14. The endoscopic surgical device of claim 13, further comprising: a suction tube suitable to deploy through the endoscope and insert into the working space, the suction tube in fluid communication with a source of suction.
  15. 15. A method for operating an endoscopic surgical device of claim 13 or 14, comprising: expanding the basket of the retrieval device; maneuvering the basket around a target object; deploying the cover to surround the basket with the target object inside, the covered basket defining a working space; inserting a laser fiber into the working space; and applying laser energy through the laser fiber to reduce the target object to one or more fragments.

Description

CAPTURE BASKET FOR LASER LITHOTRIPSY CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application claims the benefit of U.S. Provisional Patent Application Serial No. 63/512,258 filed on July 6, 2023, the disclosure of which is incorporated herein by reference. TECHNICAL FIELD [0002] This disclosure relates generally to medical devices and, more particularly, to devices for the capture and/or retrieval of objects within a body, such as stones, other calculi, or foreign matter. BACKGROUND [0003] Retrieval devices have been used to remove stones and other calculi from within the body of a patient. One type of retrieval device includes a sheath, an elongate member extending within and moveable relative to the sheath, and a basket connected to the distal end of the elongate member. The basket may have a number of legs and may have a collapsed position within the sheath and an expanded position beyond a distal end of the sheath. When the basket is in the expanded position, a targeted stone may be captured within the basket and removed from the body. Some stones, however, may be too large to be removed from the body after being captured within the basket. In this situation, a device, such as a laser fiber or other laser lithotripsy device, may be used to break up the stone before the extraction (referred to herein as “stone communition”). The stone fragments may then be removed from the body without harming the surrounding body tissue. [0004] If stone lasering is attempted while the stone is inside a basket, the smaller stone fragments generated during use of the laser may escape the basket, escaping between the struts. These stone fragments may be greater than an acceptable size and can migrate outside of the immediate working area, often lodging elsewhere in the urinary tract. If left, these larger fragments may cause problems for the patient; finding and recapturing them, on the other hand, may substantially extend the duration of the surgical procedure. [0005] The present disclosure provides retrieval devices and methods of using the same that avoid the aforementioned shortcomings of existing devices. SUMMARY [0006] This disclosure provides design, material, manufacturing method, and use alternatives for medical devices and medical systems. In a first example, a retrieval device for addressing a kidney stone, can comprise an elongate member; a basket connected to a distal end of the elongate member, the basket moveable between a retracted position having a first diameter and an expanded position having a second diameter larger than the first diameter; and a cover connected to the basket, the cover deployable to form a barrier around the basket after the basket has moved into the expanded position and surrounded a kidney stone. [0007] Alternatively or additionally to any of the examples above, the basket can include a sheath sized to enclose the basket in the retracted position, wherein the basket exits the sheath when moving into the expanded position. [0008] Alternatively or additionally to any of the examples above, the basket can include a plurality of legs joined at a proximal end to the elongate member and at the distal end to an atraumatic tip. [0009] Alternatively or additionally to any of the examples above, the device can further include a plurality of strings connected to the cover, the strings running between the cover and the atraumatic tip of the basket such that pulling the strings deploys the cover. [0010] Alternatively or additionally to any of the examples above, the cover can move from a proximal end of the basket to the atraumatic tip to form the barrier around the basket. [0011] Alternatively or additionally to any of the examples above, the device can further include a plurality of strings connected to the cover, wherein the cover is deployed ahead of the basket such that pulling the strings moves the cover from a distal end of the basket to a proximal end of the basket to form a barrier around the basket. [0012] Alternatively or additionally to any of the examples above, the cover can be water-permeable. [0013] Alternatively or additionally to any of the examples above, the cover can include at least one sheet of biocompatible material. [0014] Alternatively or additionally to any of the examples above, the biocompatible material can be thermoplastic, plant fiber, or animal tissue. [0015] Alternatively or additionally to any of the examples above, the cover can have a plurality of holes of a preselected size. [0016] Alternatively or additionally to any of the examples above, the holes can be between 1 mm and 5 mm in diameter. [0017] Alternatively or additionally to any of the examples above, the cover can be a wire mesh, the holes comprising spaces between wires of the mesh. [0018] In another example, an endoscopic surgical device comprises an endoscope having an instrument channel; a retrieval device according to any of the examples above, wherein the first diameter of the baske