Implant recovery device
The present invention provides a device for delivering and/or recovering an object, such as a patent foramen ovale (PFO) occluder. According to one embodiment of the invention, a device contains an outer sleeve and an inner sheath. The inner sheath has a proximal portion and a distal portion; the distal portion of the inner sheath is disposed inside the lumen of the outer sleeve. The distal portion of the inner sheath can expand radially to facilitate retrieval of an object. The distal portion of the inner sheath has a larger diametrical configuration than the proximal portion of the inner sheath. The distal portion of the inner sheath may be in the shape of a cone or similar shape. The distal portion of the inner sheath further includes slits that form flaps which collapse inward and overlap each other as the distal portion is in its unexpanded configuration.
1. A device for delivering or retrieving an object from a site within the body, comprising:
an outer sleeve having a lumen; and
an inner sheath having a proximal portion and a distal portion, the distal portion being disposed within the lumen, the distal portion having an unexpanded configuration and an expanded configuration, and the distal portion having a first distal inner diameter and a second proximal inner diameter, the first distal inner diameter being larger than the second proximal inner diameter when in the expanded configuration;
wherein the outer sleeve overlays at least a portion of the distal portion of the inner sheath when the device is in use, and wherein the outer sleeve extends beyond at least a portion of the distal portion of the inner sheath to form an overhang,
wherein at least a portion of the outer sleeve is bonded to a portion of the inner sheath, the outer sleeve being elastic to permit expansion of the distal portion of the inner sheath when an object is drawn into the distal portion of the inner sheath, and the outer sleeve being operable to limit radial expansion of the distal portion of the inner sheath when an object is drawn into the distal portion of the inner sheath, and
wherein the distal portion of the inner sheath includes at least two axial slits extending proximally from a distal end of the distal portion, the axial slits forming flaps that collapse inward and overlap each other when the distal portion is in the unexpanded configuration.
2. The device of claim 1 , wherein the distal portion of the inner sheath includes at least three axial slits extending proximally from the distal end of the distal portion.
3. The device of claim 1 , wherein the slits are linear.
4. The device of claim 1 , wherein the slits are wedge-shaped.
5. The device of claim 1 , wherein a proximal end of each of the slits terminates in an end for reducing stress imposed on the inner sheath due to moving from the unexpanded configuration to the expanded configuration.
6. The device of claim 5 , wherein the ends are circular voids defined by the inner sheath.
7. The device of claim 1 , further comprising a side port defining a passage through a wall of the inner sheath for accessing a lumen of the inner sheath, wherein the inner sheath has a circumference and the passage of the side port and at least one of the slits are aligned within 20 degrees along the circumference of the inner sheath.
8. The device of claim 7 , wherein the passage of the side port and at least one of the slits are aligned within 10 degrees along the circumference of the inner sheath.
9. The device of claim 8 , wherein the passage of the side port and at least one of the slits are aligned within 5 degrees along the circumference of the inner sheath.
10. The device of claim 1 , the inner sheath having a curved portion proximal from the distal portion.
11. The device of claim 10 , wherein the distal portion of the inner sheath includes at least two axial slits extending proximally from a distal end of the distal portion, and wherein at least one of the slits and a direction of the curve of the curved portion are aligned within 20 degrees relative to the direction of the curve.
12. The device of claim 11 , wherein the plane and at least one of the slits are aligned within 10 degrees along the circumference of the distal end portion.
13. The device of claim 12 , wherein the plane and at least one of the slits are aligned within 5 degrees along the circumference of the distal end portion.
14. The device of claim 1 , the distal portion further comprising a distal end, a proximal end, and a joint disposed between the distal end and the proximal end, the joint for enabling at least a part of the distal portion to deflect inward or outward relative to a central axis of the distal portion.
15. The device of claim 14 , wherein the joint comprises a segment of the distal portion of the inner sheath that has been thinned relative to the remaining portion of the distal portion.
16. The device of claim 14 , wherein the joint comprises perforations.
17. The device of claim 1 , wherein the distal portion is cone-shaped.
18. The device of claim 1 , wherein at least a portion of the distal portion has at least one of a cone shape, a bell shape, a cylindrical shape, and a trumpet shape.
19. The device of claim 1 , wherein a portion of the outer sleeve extends distally to a distal end of the inner sheath.
20. The device of claim 1 , wherein the outer sleeve overlays the entire distal portion of the inner sheath.
21. The device of claim 20 , wherein the entire outer sleeve extends beyond the distal portion of the inner sheath to form an overhang.