Patent Application
20250120801
N/A
Not applicable
Not applicable
The present invention relates to bioresorbable vascular implants such as filters (e.g., vena cava filters) and occlusion devices. More particularly, the present invention relates to a vascular implant that is sized and shaped to narrow and partially flatten the vessel where it is implanted (e.g., vena cava) to reduce the area available for emboli to pass. In one or more embodiments of the present invention, the improved vascular implant bioresorbs into a patient's vascular system (e.g., inferior vena cava, iliofemoral vein, ovarian veins, splenic artery, hepatic artery or other vein/artery vessel). For example, after transient risk of pulmonary embolism (PE) has subsided, the present invention bioresorbs into a patient's vascular system (e.g. inferior vena cava or iliofemoral vein). The entire implant structure could be made of bioresorbable material so that no implant or implant remnant/element would ultimately be left behind as the entire implant would resorb into vascular tissue.
Vascular implants include various devices that are placed at a selected locale in a patient's blood vessel. One example is a vena cava filter. Another example is an occlusion device. Various patents have issued for vascular implants. Patents have also issued that relate in general to 3D printing of implants. Examples are listed in the following Table 1. Each patent listed in Table 1 is hereby incorporated herein by reference.
The present invention provides a vascular implant preferably having an oval shaped side wall surrounding a bore wherein the side wall has opposed curved end portions, an outer surface and an inner surface surrounding the bore.
In one or more embodiments, there are preferably first and second filter openings on opposing ends of the bore.
In one or more embodiments, the body is preferably sized and shaped to change the shape of the patient's vascular system at a vessel implant site and reduce the area available for emboli to pass.
In one or more embodiments, the filter body is preferably 3D printed of a polymeric material.
In one or more embodiments, the implant body is preferably of a bioresorbable material.
In one or more embodiments, there are preferably one or more anchors on the side wall outer surface.
In one or more embodiments, the anchors are preferably on said curved end portions.
In one or more embodiments, the anchors preferably include proximal and distal anchors.
In one or more embodiments, there are at least a pair of anchors on each curved end portion.
In one or more embodiments, the implant body has proximal and distal edges, at least one anchor next to the proximal edge and at least one anchor next to the distal edge.
In one or more embodiments, at least a portion of the side wall is flat.
In one or more embodiments, the side wall has elongated or planar sections that each connect to a curved end position.
In one or more embodiments, the implant body has an oval shaped side wall surrounding a bore wherein the side wall has opposed curved end portions, an outer surface and an inner surface surrounding the bore.
In one or more embodiments, the body is sized and shaped to change the shape of the patient's vascular system at a vessel implant site in order to reduce the area available for emboli to pass.
In one or more embodiments, the body is rigid enough to change the shape of the vessel where the implant body is placed.
In one or more embodiments, the filter body is 3D printed of a polymeric material.
In one or more embodiments, the implant body is of a bioresorbable material.
In one or more embodiments, the anchors are preferably on the curved end portions.
In one or more embodiments, the implant body is of a bioresorbable polymer.
In one or more embodiments, the side wall has elongated or planar sections that each connect to the curved end position.
In one or more embodiments, the side wall preferably has one or more corrugated portions.
In one or more embodiments, there are preferably two (2) opposed corrugated portions.
In one or more embodiments, an elongated implant body has a length and a width, a wall that includes first and second opposed curved end portions, and opposed elongated wall sections that each connect to the first and second opposed curved end portions, the length is preferably greater than said width, and the wall preferably has an inner surface surrounding an open ended bore.
In one or more embodiments, there are preferably openings on opposing ends of the bore.
In one or more embodiments, the body is sized and shaped to change the shape of the patient's vascular system at a vessel implant site and reduce the area available for emboli to pass.
For a further understanding of the nature, objects, and advantages of the present invention, reference should be had to the following detailed description, read in conjunction with the following drawings, wherein like reference numerals denote like elements and wherein:
The implant 10 could be deployed with either a femoral or jugular approach. Such a deployment could employ a pusher or pusher apparatus/mechanism such as one specified in one or more of the patents listed in Table 1. An example is U.S. Pat. No. 8,518,072 naming Jonathan Miller as inventor and assigned to C.R. Bard, Inc. Implant 10 could also be a balloon-mounted implant that is then expanded with balloon dilation, as seen, for example, in balloon expandable stents. Once implanted inside a selected vessel 26 or vascular location, the shape of the implant body 11 causes the vessel 26 to partially flatten as the selected vessel assumes the shape of the implant body 11 (as shown by the arrows 50 in
In this embodiment, the implant body has first and second filter openings, and a length and a width in a plane transverse to the direction of blood flow, from the first filter to the second filter opening or vice versa. The length 29 is greater than the width 27. When the implant is placed, the longitudinal end portions 13, 14 push the vessel outwards in the regions of contact between the longitudinal end portions 13, 14 and the vessel, and the vessel is deformed thereby such that the implant fits inside the vessel. At the same time, due to this deformation the vessel will be flattened in the transverse direction of the elongated shape, thus reducing the available area or dimension for emboli to pass (see
In the shown embodiment, the body 11 comprises a wall 12 that includes first and second opposed curved end portions 13, 14 and opposed elongated wall sections 15, 16 that each connect to the first and second opposed curved end portions. The wall 12 has an inner surface 20 surrounding an open ended bore 19, with the first and second filter openings on opposing ends of the bore. The side wall 12 can be shaped as an open cylinder with an elongated base, and in this embodiment has an oval base. The side wall 12 extends between the first and second filter openings. In this example, the height of the cylinder, that is the distance between the opposing ends of the bore 19, is about the same as the width of the elongated base thereof. This facilitates manipulation of the body inside the vessel.
In an embodiment, the flow resistance of the bore 19 is the same as the flow resistance of the vessel over the distance where the bore is placed. Thereby the risk of complications after placing the implant can be reduced.
The bore 19 has a generally oval or elongated shaped cross-section perpendicular to the axial direction of the implant body. This allows to reduce the changes in flow profile of the vessel caused by placing the implant 10. The implant body 11 can be placed inside the vessel with the axis of the bore 19 parallel to the direction of blood flow, and the sidewall 12 parallel to the vessel. The length of the oval or elongated shape, in case of an ellipse this is the distance between the vertex points of the major axis, is larger than the diameter 28 of vessel 26. Vessel 26 thus conforms to the generally oval or elongated shape of body 11. The width 27 of implant body 11 is smaller than the diameter 28 of vessel 26, thus reducing the available area or dimension for emboli to pass (see
The circumference of the implant body 11 can be equal to the circumference of the vessel, in which case the vessel effectively fits around the implant body 11 without being stretched. The circumference of the implant body 11 can be larger than the circumference of the vessel, in which case the vessel effectively fits around the implant body 11 while being stretched to make the circumferences equal, which may allow for a frictional anchoring. The circumference of the implant body 11 can be smaller than the circumference of the vessel, in which case at some locations a passage may remain between vessel and the implant body 11 through which blood can flow, but of which passage the available area or dimension for emboli to pass is reduced.
In case the implant body 11 is of a bioresorbable material, due to the proximity, and in this example the contact, of the wall to the vessel, the implant body 11 will over time be resorbed into the vessel. When of a bioresorbable material, the bioresorption starts as soon as the implant is exposed to the blood and like many of the standard polymers degrades over time via polymer breakdown and absorption of the byproducts. This bioresorption can be tuned as needed to ensure the implant maintains structural filtering integrity until transient risk of pulmonary embolism has subsided. Thereby, the need for a retrieval procedure on the patient to retrieve the implant can be obviated. In an embodiment, the implant body 11 adheres to the vessel, such that when the implant body 11 is not homogeneously resorbed and e.g. breaks, the separate parts remain in position.
In one or more embodiments, implant body 11 can be placed in a vessel such as the vena cava. In such a case, width or diameter 27 of body 11 can be between about 15 and 30 mm for inferior vena cava pulmonary embolism prevention. For iliofemoral prevention, the implant 10 body 11 can have a width or diameter of between about 6 and 20 mm. For other smaller vessels, the diameter or width can be between about 2 and 8 mm. Length 29 of body 11 (see
Implant body 11 has side wall 12 that includes curved end portions 13, 14 and planar or elongated sections 15, 16 (see
Each corrugated portion can include multiple panels 37 joined at intersections 38 as shown. Implant body 31 has proximal edge 39 and distal edge 40 (see
The vascular implant can thus be characterized by comprising an elongated implant body having a length and a width and being sized and shaped to change the shape of the patient's vascular system at a vessel implant site and reduce the area available for emboli to pass.
Without limitation, the implant may further be characterized by comprising a wall that includes first and second opposed curved end portions and opposed elongated wall sections that each connect to the first and second opposed curved end portions, the length greater than the width, the wall having an inner surface surrounding an open-ended bore, and first and second filter openings on opposing ends of the bore.
Without limitation, the implant may further be characterized by one or more of the following statements:
The following is a list of parts and materials suitable for use in the present invention.
All measurements disclosed herein are at standard temperature and pressure, at sea level on Earth, unless indicated otherwise. All materials used or intended to be used in a human being are biocompatible, unless indicated otherwise.
The foregoing embodiments are presented by way of example only; the scope of the present invention is to be limited only by the following claims.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/US2021/073177 | 12/30/2021 | WO |
