Medical devices with cutting elements

• US 8,052,703 B2
• Filed: 06/29/2005
• Issued: 11/08/2011
• Est. Priority Date: 06/29/2005
• Status: Active Grant

• Current Assignee: Boston Scientific Scimed, Inc. (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed, Inc. (Boston Scientific Corporation)
• Inventors: St. Martin, Timothy R., Wallingford, Randall O.
• Primary Examiner(s): Hindenburg; Max
• Assistant Examiner(s): Foreman; Jonathan M
• Application Number:
  US11/169,415
• Publication Number:
  US 20070016232A1
• Time in Patent Office: 2,323 Days
• Field of Search: 600/564, 600/572, 600/562, 606/159, 606/170, 606/191, 606/192, 606/194, 604/96
• US Class Current: 606/159
• CPC Class Codes: A61B 17/320725 with radially expandable cutting or abrading elements A61B17/32075 takes precedence
• CPC Class Codes: A61B 2017/00557 inflatable A61B2017/22051 takes precedence
• CPC Class Codes: A61B 2017/00778 Operations on blood vessels A61B2017/22097, A61B2017/320741 take precedence
• CPC Class Codes: A61B 2017/22001 Angioplasty, e.g. PCTA
• CPC Class Codes: A61B 2017/22061 for spreading elements apart
• CPC Class Codes: A61L 29/02 Inorganic materials
• CPC Class Codes: A61L 29/14 Materials characterised by their function or physical properties , e.g. lubricating compositions
• CPC Class Codes: A61M 2025/1086 having a special balloon surface topography, e.g. pores, protuberances, spikes or grooves

Abstract

Medical devices having one or more cutting elements are disclosed. In some embodiments, a medical device includes an elongated catheter configured to be inserted into a body, and a cutting element carried by the catheter. The cutting element has an alloy including from about 12% to about 16% by weight of chromium, from about 0.5% to about 5% by weight of molybdenum, and iron. The alloy has a martensitic phase.

Claims

1. A medical device, comprising:

an elongated catheter configured to be inserted into a body;

an inflatable balloon attached to the catheter; and

a cutting element carried by the balloon, the cutting element comprising an alloy having a nickel equivalent and a chromium equivalent within a first area of a Schaeffler diagram, the first area being defined by 12 equivalent chromium-zero equivalent nickel, 12 equivalent chromium-15.5 equivalent nickel, and 26 equivalent chromium-4.5 equivalent nickel,

wherein a chromium equivalent is equal to % Cr+% Mo+1.5×

% Si+0.5×

% Nb, a nickel equivalent is equal to % Ni+30×

% C+0.5×

% Mn, and the alloy comprising at least two phases, one of the phases being a martensitic phase;

wherein the alloy comprises from about 0.35% to about 0.65% by weight of carbon;

wherein the alloy comprises from about 12% to about 16% by weight of chromium, from about 0.5% to about 5% by weight of molybdenum, and iron.

2. The device of claim 1, wherein the alloy comprises from about 0.5% to about 1.5% by weight of manganese.

3. The device of claim 1, wherein the alloy comprises from about 76% to about 87% by weight of iron.

4. The device of claim 1, wherein the alloy comprises from about 0.5% to about 1.5% by weight of manganese, less than or equal to about 0.5% by weight of silicon, and from about 69% to about 87% by weight of iron.

5. The device of claim 4, wherein the alloy further comprises nickel and/or cobalt.

6. The device of claim 1, further comprising a lubricious coating on the cutting element.

7. The device of claim 1, further comprising an oxidized layer on the cutting element.

8. The device of claim 1, wherein the alloy has a hardness of from about 49 to about 55 Rockwell Hardness C.