Method for manufacturing medical devices from linear elastic materials while maintaining linear elastic properties

• US 7,163,550 B2
• Filed: 03/26/2003
• Issued: 01/16/2007
• Est. Priority Date: 03/26/2003
• Status: Expired due to Fees

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Scimed Life Systems Incorporated (Boston Scientific Corporation)
• Inventors: Boismier, Dennis A.
• Primary Examiner(s): TRUONG, KEVIN THAO
• Application Number:
  US10/400,014
• Publication Number:
  US 20040193207A1
• Time in Patent Office: 1,392 Days
• Field of Search: 606/200, 606/113, 606/114, 606/127, 606/159, 128/898
• US Class Current: 606/200
• CPC Class Codes: A61F 2/0105 Open ended, i.e. legs gathered only at one side
• CPC Class Codes: A61F 2002/018 made from tubes or sheets of material, e.g. by etching or laser-cutting
• CPC Class Codes: A61F 2230/0006 circular
• CPC Class Codes: A61F 2230/0067 conical

Abstract

Medical devices and methods of manufacturing medical devices at least partially from linear elastic materials. The manufacturing methods may include cold-forming and/or low-temperature heat setting to construct medical devices.

Claims

1. A method of manufacturing an embolic protection filtering device, comprising the steps of:

providing a linear elastic shaft;

providing a filter shaping member, the shaping member including a filter loop defining region; and

disposing the linear elastic shaft adjacent the filter loop defining region, wherein disposing the linear elastic shaft adjacent the filter loop defining region alters the shape of the linear elastic shaft so that it substantially conforms to the shape of the filter loop defining region to define a filter loop, and wherein the filter loop exhibits a linear elastic response to stress.

2. The method of claim 1, wherein the linear elastic shaft includes a linear elastic nickel-titanium alloy.

3. The method of claim 1, wherein the filter shaping member is smaller in size than the filter loop so that the step of disposing the linear elastic shaft adjacent the filter loop defining region includes defining a preliminary filter loop that expands to define the filter loop when the shaft and the mandrel are disassociated.

4. The method of claim 1, wherein the step of disposing the linear elastic shaft adjacent the filter loop defining region occurs at a temperature in the range of about 15 to 25 degrees Celsius.

5. The method of claim 1, wherein the step of disposing the linear elastic shaft adjacent the filter loop defining region includes heat treatment.

6. The method of claim 5, wherein heat treatment includes heating the shaft at a temperature less than 300 degrees Celsius.

7. The method of claim 5, wherein heat treatment includes heating the shaft for about 5 to about 60 minutes.

8. The method of claim 1, further comprising the step of coupling a filter membrane to the filter loop.

9. The method of claim 1, further comprising the step of coupling the filter loop to a shaft member.

10. The method of claim 9, wherein the shaft member is a guidewire.

11. The method of claim 9, wherein the shaft member is a tubular filter cartridge.

12. An embolic protection filtering device, comprising:

a shaft;

a filter coupled to the shaft, the filter including a filter frame assembly and a filter membrane coupled to the filter frame assembly and extending distally therefrom, the frame assembly including a filter loop and one or more struts extending between the filter loop and the shaft; and

wherein at least a portion of the frame assembly includes a linear elastic material.

13. The filtering device of claim 12, wherein the filter loop includes a linear elastic material.

14. The filtering device of claim 12, wherein the linear elastic material includes nickel-titanium alloy.

15. A method of manufacturing an embolic protection filter, comprising the steps of:

providing a linear elastic shaft formed at least in part from a precursor of a superelastic material;

forming the linear elastic shaft into a shape that defines a filter loop and one or more struts, the loop and struts having linear elastic properties;

coupling a filter membrane to the filter loop; and

coupling the one or more struts to a shaft member.

16. The method of claim 15, wherein the step of forming the linear elastic shaft into a shape that defines a filter loop and one or more struts includes disposing the linear elastic shaft about a forming member.

17. The method of claim 15, wherein the step of forming the linear elastic shaft into a shape that defines a filter loop and one or more struts includes low-temperature heat setting.

18. The method of claim 17, wherein low-temperature heat setting includes heat setting at a temperature less than about 300 degrees Celsius.

19. The method of claim 17, wherein low-temperature heat setting includes heat setting for about 5 to about 60 minutes.

20. A method of manufacturing an embolic protection filtering device, comprising the steps of:

providing a nickel-titanium alloy shaft;

disposing the shaft on a forming member;

heat-treating the shaft at a temperature less than about 300 degrees Celsius so as to define a filter frame assembly, and wherein the frame assembly exhibits linear elastic properties.