Medical retrieval device

• US 20030212430A1
• Filed: 03/06/2003
• Published: 11/13/2003
• Est. Priority Date: 03/06/2002
• Status: Active Grant

• Current Assignee: Stryker European Operations Holdings, LLC (Stryker Corporation)
• Original Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Inventors: Barry, David, Bose, Arani
• Granted Patent: US 7,063,707 B2
• Time in Patent Office: Days
• US Class Current: 606/200
• CPC Class Codes: A61B 17/221 Gripping devices in the form of loops or baskets for gripping calculi or similar types of obstructions surgical snare instruments A61B17/32056
• CPC Class Codes: A61B 2017/2215 having an open distal end
• CPC Class Codes: A61B 2017/320064 with tissue or sample retaining means
• CPC Class Codes: A61F 2/011 Instruments for their placement or removal
• CPC Class Codes: A61F 2/91 made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
• CPC Class Codes: A61F 2/915 with bands having a meander structure, adjacent bands being connected to each other
• CPC Class Codes: A61F 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts
• CPC Class Codes: A61F 2002/016 made from wire-like elements
• CPC Class Codes: A61F 2002/018 made from tubes or sheets of material, e.g. by etching or laser-cutting
• CPC Class Codes: A61F 2002/91541 Adjacent bands are arranged out of phase
• CPC Class Codes: A61F 2002/91558 connected peak to peak
• CPC Class Codes: A61F 2220/0016 with sharp anchoring protrusions, e.g. barbs, pins, spikes
• CPC Class Codes: A61F 2220/0033 made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2220/005 using adhesives
• CPC Class Codes: A61F 2220/0058 soldered or brazed or welded
• CPC Class Codes: A61F 2230/0006 circular
• CPC Class Codes: A61F 2230/005 Rosette-shaped, e.g. star-shaped
• CPC Class Codes: A61F 2230/0054 V-shaped
• CPC Class Codes: A61F 2230/0069 cylindrical
• CPC Class Codes: A61F 2230/0097 Harpoon-shaped

Abstract

Alternative designs, materials and manufacturing methods for medical retrieval devices. Some embodiments pertain to a medical retrieval device including a cage having internal migration barriers therein. Some embodiments pertain to a medical retrieval device including a cage having variable diameters along the length thereof. Several alternative medical retrieval devices constructions and/or designs including methods and techniques of construction are also disclosed.

Claims

1. A medical retrieval device comprising:

an elongated shaft including a distal end;

a cage having a distal end and a proximal end, the proximal end of the cage coupled to the distal end of the shaft, the cage including an inner surface defining a lumen, the cage including at least one internal migration barrier extending from the inner surface of the cage into the lumen.

2. The medical retrieval device of claim 1, wherein the cage includes a plurality of internal migration barriers extending from the inner surface of the cage into the lumen.

3. The medical retrieval device of claim 1, wherein the cage includes four or more internal migration barriers extending from the inner surface of the cage into the lumen.

4. The medical retrieval device of claim 1, wherein the cage comprises an elongated tubular member having a proximal end and a distal end, and the internal migration barrier is spaced from the distal end.

5. The medical retrieval device of claim 1, wherein the internal migration barrier is configured to contact a portion of a material entering the lumen of the cage to reduce the likelihood that such material will exit the distal end of the cage.

6. The medical retrieval device of claim 1, wherein the internal migration barrier comprises an elongated member oriented an angle directed inwardly toward the longitudinal axis of the cage, and proximally toward the proximal end of the cage.

7. The medical retrieval device of claim 1, wherein the internal migration barrier comprises an elongated member oriented an angled such that it is directed inwardly and proximally such that the internal migration barrier forms an angle with the plane of the inner surface that is in the range of about 10°

to about 85°

.

8. The medical retrieval device of claim 1, wherein the internal migration barrier is a barb configured to contact a portion of a material entering into the lumen through the distal end of the cage to reduce the likelihood that the material will exit the lumen through the distal end of the cage.

9. The medical retrieval device of claim 1, wherein the cage includes a first portion having a first outer diameter, and a second portion having a second outer diameter, wherein the first outer diameter is larger than the second outer diameter.

10. The medical retrieval device of claim 9, wherein the first portion is a proximal portion and the second portion is a distal portion.

11. The medical retrieval device of claim 1, wherein the cage is adapted to be expandable from a first configuration sized for intracorporal insertion, to a second, expanded configuration, wherein at least a portion of the cage when in the second configuration has a larger outer diameter than when in the first configuration.

12. The medical retrieval device of claim 11, wherein when the cage is in the first configuration, it includes a portion having a generally constant outer diameter, and when the cage is in the second configuration, the portion expands such that it includes a first expanded region having a first outer diameter and a second expanded region having a second outer diameter different from the first expanded outer diameter.

13. The medical retrieval device of claim 12, wherein the first region is a proximal region and the second region is a distal region, and the proximal region has a greater outer diameter than the distal region.

14. The medical retrieval device of claim 11, wherein when the cage is in the first configuration, it is adapted for insertion into a neurovasculature of a patient.

15. The medical retrieval device of claim 1, wherein the cage comprises a shape memory material.

16. The medical retrieval device of claim 1, wherein the cage comprises an elongated tubular member comprising a single tubular structural member that is formed or worked into the desired structure.

17. The medical retrieval device of claim 1, wherein the cage includes a structure defining an exterior surface, the inner surface, and one or more interstitial spaces that extend through the structure from the exterior surface to the inner surface, wherein the spaces are in the range of about 500 microns or greater.

18. A medical retrieval device comprising:

an elongated shaft including a distal end; and

a tubular cage coupled to the distal end of the shaft, the cage adapted to be expandable from a first configuration sized for intracorporal insertion, to a second, expanded configuration wherein at least a portion of the cage has a larger outer diameter than when in the first configuration;

wherein when the cage is in the first configuration, it includes a portion having a generally constant outer diameter, and when the cage is in the second configuration, the portion expands such that it includes a first expanded region having a first outer diameter and a second expanded region having a second outer diameter different from the first expanded outer diameter.

19. The medical retrieval device of claim 18, wherein the first region is a proximal region and the second region is a distal region, and the proximal region has a greater outer diameter than the distal region.

20. The medical retrieval device of claim 18, wherein the cage comprises a shape memory material.

21. The medical retrieval device of claim 20, wherein the cage expands from the first configuration to the second configuration through a shape memory effect.

22. A medical retrieval device comprising:

an elongated shaft including a distal end;

a tubular cage coupled to the distal end of the shaft, the cage including structure defining an exterior surface, an inner surface, and one or more interstitial spaces that extend through the structure from the exterior surface to the inner surface, wherein the spaces are in the range of about 500 microns or greater.

23. The medical retrieval device of claim 22, wherein the cage is adapted or configured to be expandable from a first configuration sized for intracorporal insertion, to a second, expanded configuration wherein at least a portion of the cage member has a larger outer diameter than when in the first configuration.

24. A method of making a medical retrieval device, the method comprising providing an elongated shaft including a distal end;

providing a cage having a distal end and a proximal end, the cage including an inner surface defining a lumen, the cage including at least one internal migration barrier extending from the inner surface of the cage into the lumen; and

coupling the proximal end of the cage to the distal end of the shaft.

25. A method of removing a body from within the vasculature of a patient, the method comprising:

providing a medical retrieval device including;

an elongated shaft including a distal end;

a cage having a distal end and a proximal end, the proximal end of the cage coupled to the distal end of the shaft, the cage including an inner surface defining a lumen, the cage including at least one internal migration barrier extending from the inner surface of the cage into the lumen;

disposing the cage of the medical retrieval device within a delivery catheter;

advancing the delivery catheter to a site within the anatomy that is proximal to the body to be removed;

extending the cage of the medical retrieval device from within the delivery catheter;

advancing the cage of the medical retrieval device such that at least a portion of the body is disposed within the lumen; and

removing the cage including the body from the anatomy of the patient.