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EP-4240293-B1 - DEVICES FOR STENT GRAFT EXTRACTION

EP4240293B1EP 4240293 B1EP4240293 B1EP 4240293B1EP-4240293-B1

Inventors

  • THORSON, Brian
  • BROWN, Kellie R.
  • HEARD, BENJAMIN

Dates

Publication Date
20260506
Application Date
20211103

Claims (10)

  1. A device for extracting an endovascular stent graft (10) from a vessel, comprising: a cylindrical body (30) having a first open end (34), a second open end (38), and a sidewall (42) surrounding a hollow bore (43) of the cylindrical body; and an opening (50) formed in the sidewall between the first open end and the second open end forming a first ring portion (54) at the first open end and a second ring portion (58) at the second open end, wherein a thickness of the sidewall at the first open end tapers toward the opening and wherein a thickness of the sidewall at the second open end tapers toward the opening such that the hollow bore is narrower at each end than at the opening.
  2. The device of claim 1, wherein the first open end (34) has a greater outer diameter than the second open end (38), and optionally wherein the first open end has an outer diameter of approximately 24-26 millimeters and the second open end has an outer diameter of approximately 18-20 millimeters.
  3. The device of claim 1, wherein the cylindrical body (30) is approximately 10-15 centimeters in length.
  4. The device of claim 1, wherein the cylindrical body (30) is curved along its length, and optionally, wherein the opening (50) is formed in the sidewall (42) at a concave portion of the curved cylindrical body.
  5. The device of claim 1, wherein the edge of the cylindrical body (30) at the first open end (34) and the second open end (38) is rounded to provide a smooth edge (70).
  6. The device of claim 1, wherein the cylindrical body (30) is rigid.
  7. The device of claim 1, wherein the cylindrical body (30) is formed of medical grade plastic.
  8. The device of claim 1, wherein the cylindrical body (30) is formed of stainless steel.
  9. The device of claim 1, wherein the cylindrical body (30) is formed of a material suitable for sterilization.
  10. The device of claim 1, wherein the cylindrical body (30) is configured and formed of a material suitable for 3-D printing.

Description

This application claims priority to U.S. Patent Application No. 17/088,102, filed November 3, 2020. BACKGROUND The present invention relates generally to the field of endovascular stent graft extraction, and more particularly to devices for atraumatic stent grant extraction. An endovascular stent graft may be used for a variety of conditions involving the blood vessels, but most commonly to reinforce a weak spot in an artery called an aneurysm. Over time, blood pressure and other factors can cause this weak area to bulge and eventually enlarge and rupture. A stent graft is implanted to tightly seal with the artery above and below the aneurysm. The graft is stronger than the weakened artery and allows blood to pass through it without pushing on the bulge.. Occasionally, extraction of the stent graft is necessary due to infection or failure of the original implant to perform as intended. Because the stent graft typically includes prongs which engage with the vessel wall, extraction of the device can cause significant damage to the tissue to which it is engaged. US 2014/155930 describes a removal device for retrieving an implanted vena cava filter with a superior removal hook and inferior struts. Stent graft explant is known to be associated with high morbidity, caused by a confluence of factors. Damage caused to the vessel wall during the extraction process is one factor that contributes to the high morbidity. Accordingly, there is a need for a device that promotes atraumatic removal of a stent graft from a vessel. SUMMARY OF THE INVENTION Aspects of the present invention are set out in the appended claims, with dependent claims reciting optional features. At least one embodiment relates to a device for extracting an endovascular stent graft from a vessel. The device includes a cylindrical body and an opening formed in the cylindrical body. The cylindrical body has a first open end, a second open end, and a sidewall surrounding a hollow bore of the cylindrical body. The opening is formed in the sidewall between the first open end and the second open end forming a first ring portion at the first open end and a second ring portion at the second open end. Additionally, a thickness of the sidewall at the first open end tapers toward the opening and wherein a thickness of the sidewall at the second open end tapers toward the opening such that the hollow bore is narrower at each end than at the opening. This summary is illustrative only and should not be regarded as limiting. BRIEF DESCRIPTION OF THE DRAWINGS A clear conception of the advantages and features constituting the present disclosure, and of the construction and operation of typical mechanisms provided with the present disclosure, will become more readily apparent by referring to the exemplary, and therefore non-limiting, embodiments illustrated in the drawings accompanying and forming a part of this specification, wherein like reference numerals designate the same elements in the several views, and in which: FIG. 1A is a perspective view of an endovascular stent graft for use in an abdominal aorta, according to an exemplary embodiment.FIG. 1B is a partial view of the endovascular stent graft of FIG. 1 implanted into the abdominal aorta.FIG. 2 is a perspective view of an endovascular stent graft extraction device, according to an exemplary embodiment.FIG. 3 is a rear view of the endovascular stent graft extraction device of FIG. 2.FIG. 4 is a section view of the endovascular stent graft extraction device of FIG. 3 along line 4-4.FIG. 5A is a cut-out view of a sidewall proximate a first end of the endovascular stent graft extraction device of FIG. 4.FIG. 5B is a cut-out view of the sidewall proximate a second end of the endovascular stent graft extraction device of FIG. 4.FIGS. 6A-6E is a perspective view of the endovascular stent graft extraction device of FIG. 2 being used in a method of extracting an endovascular stent graft.FIG. 7 is a perspective view of a second endovascular stent graft extraction device, according to another embodiment.FIG. 8 is a perspective view of a third endovascular stent graft extraction device, according to another embodiment.FIG. 9 is a perspective view of a fourth endovascular stent graft extraction device, according to another embodiment.FIG. 10 is a perspective view of a fifth endovascular stent graft extraction device, according to another embodiment. The foregoing and other features of the present disclosure will become apparent from the following description and appended claims, taken in conjunction with the accompanying drawings. Understanding that these drawings depict only several embodiments in accordance with the disclosure and are therefore, not to be considered limiting of its scope, the disclosure will be described with additional specificity and detail through use of the accompanying drawings. DETAILED DESCRIPTION In the following detailed description, reference is made to the accompanying drawings, which form