US6015420A — Atherectomy device for reducing damage to vessels…

Claim 1

Independent Claim 81 words

An ablation burr for removing deposits from a patient's vessel or stent, comprising: a burr body having a distal end and a proximal end and a concave leading outer surface, the concave leading outer surface having a radius that increases from a smooth distal tip at the distal end of the burr to a point that is proximal to the smooth distal tip, wherein the concave leading outer surface includes an abrasive that removes deposits from the patient's vessel or stent.

Claim 2

Dependent Claim 81 words

An ablation burr for removing deposits from a patient's vessel or stent, comprising: a burr body having a distal end and a proximal end and a concave leading outer surface, the concave leading outer surface having a radius that increases from a smooth distal tip at the distal end of the burr to a point that is proximal to the smooth distal tip, wherein the concave leading outer surface includes an abrasive that removes deposits from the patient's vessel or stent.

Claim 3

Dependent Claim 62 words

the ablation burr according to claim 1, wherein the concave leading outer surface has a point of maximum radius that is between the distal tip and proximal end of the burr body, the burr body further including a convex outer surface that extends from the point of maximum radius of the concave leading outer surface and the proximal end of the burr.

Claim 4

Dependent Claim 29 words

The ablation burr according to claim 2, wherein a portion of the convex outer surface of the ablation burr body has a number of outwardly extending dimples disposed thereon.

Claim 5

Dependent Claim 66 words

An ablation burr to be secured to the distal end of a flexible drive shaft in order to remove deposits from a patient's vessel or stent, comprising: a burr body having a distal end and a proximal end, the distal end having a distal outermost surface that is generally non-abrasive and at least one depression that lies below the outermost surface having an abrasive deposited therein.

Claim 6

Dependent Claim 66 words

An ablation burr to be secured to the distal end of a flexible drive shaft in order to remove deposits from a patient's vessel or stent, comprising: a burr body having a distal end and a proximal end, the distal end having a distal outermost surface that is generally non-abrasive and at least one depression that lies below the outermost surface having an abrasive deposited therein.

Claim 7

Dependent Claim 32 words

The ablation burr according to claim 4, wherein the distal outer surface of the ablation burr includes a number of depressions that extend axially from a distal tip of the ablation burr.

Claim 8

Dependent Claim 58 words

The ablation burr according to claim 5, wherein the number of depressions define a number of abrasive flutes disposed about a circumference of a distal tip of the ablation burr, each of the flutes having a width that increases from a point near the distal tip of the ablation burr towards a proximal end of the ablation burr.

Claim 9

Dependent Claim 71 words

An ablation burr to be secured to the distal end of a flexible drive shaft in order to remove deposits from a stent in a patient's vessel. comprising: a burr body having an outer surface wherein a portion of the outer surface has an abrasive disposed thereon that is made from a material that having a hardness that is less than a hardness of a material used to form the stent.

Claim 10

Dependent Claim 71 words

An ablation burr to be secured to the distal end of a flexible drive shaft in order to remove deposits from a stent in a patient's vessel. comprising: a burr body having an outer surface wherein a portion of the outer surface has an abrasive disposed thereon that is made from a material that having a hardness that is less than a hardness of a material used to form the stent.

Claim 11

Dependent Claim 41 words

The ablation burr according to the claim 7, wherein the abrasive comprises a number of chips wherein the material used to form the chips has a hardness that is less than a hardness of a material used to form the stent.

Claim 12

Dependent Claim 40 words

The ablation burr according to claim 7, wherein the abrasive comprises an abrasive grit wherein the material used to form the abrasive grit has a hardness that is less than a hardness of a material used to form the stent.

Claim 13

Dependent Claim 62 words

An ablation burr to be secured to a distal end of a flexible drive shaft in order to remove deposits from a patient's vessel or stent, comprising: a burr body having an outer surface that includes a number of cutting blades, wherein the cutting blades have a hardness which is less than a hardness of a material used to form the stent.

Claim 14

Dependent Claim 62 words

An ablation burr to be secured to a distal end of a flexible drive shaft in order to remove deposits from a patient's vessel or stent, comprising: a burr body having an outer surface that includes a number of cutting blades, wherein the cutting blades have a hardness which is less than a hardness of a material used to form the stent.

Claim 15

Dependent Claim 27 words

The ablation burr according to claim 10, wherein the blades are formed of a material selected from the group consisting of aluminum, titanium and annealed stainless steel.

Claim 16

Dependent Claim 13 words

The atherectomy device according to claim 10, wherein the blades are surfaced hardened.

Claim 17

Dependent Claim 80 words

An atherectomy device for removing deposits from a blood vessel wall, comprising: a flexible drive shaft; a rotatable ablation device secured to the drive shaft, the ablation device having a distal shoulder, proximal shoulder and a material removable portion disposed between the distal and proximal shoulders, and wherein the distal shoulder is less abrasive than the material removal portion in order to guide the ablation device through the blood vessel as the ablation device is advanced on the drive shaft.

Claim 18

Dependent Claim 80 words

An atherectomy device for removing deposits from a blood vessel wall, comprising: a flexible drive shaft; a rotatable ablation device secured to the drive shaft, the ablation device having a distal shoulder, proximal shoulder and a material removable portion disposed between the distal and proximal shoulders, and wherein the distal shoulder is less abrasive than the material removal portion in order to guide the ablation device through the blood vessel as the ablation device is advanced on the drive shaft.

Claim 19

Dependent Claim 28 words

The atherectomy device of claim 13, wherein the material removal portion of the ablation device is recessed with respect to the outer circumference of the distal shoulder portion.

Claim 20

Dependent Claim 37 words

The atherectomy device according to claim 13, wherein the distal shoulder portion and the proximal shoulder portion of the ablation device have a maximum radius that is greater than the maximum radius of the material removal portion.

Claim 21

Dependent Claim 25 words

The atherectomy device according to claim 14, wherein the ablation device includes an abrasive grit disposed on an outer surface of the material removal portion.

Claim 22

Dependent Claim 27 words

The atherectomy device according to claim 14, wherein the ablation device includes a number of abrasive chips disposed on an outer surface of the material removal portion.

Claim 23

Dependent Claim 27 words

The atherectomy device according to claim 14, wherein the ablation device includes a number of cutting blades disposed on an outer surface of the material removal portion.

Claim 24

Dependent Claim 103 words

An atherectomy device comprising a flexible drive shaft attached to an ablation burr, wherein the flexible drive shaft and the ablation burr are disposed about a central axis, the ablation burr has a first cross section spaced from a second cross section, wherein the second cross section has a larger cross sectional area than the first cross section, the ablation burr further having a first outer surface that extends between the first cross section and the second cross section, and extends inward toward the central axis relative to an imaginary line that extends between the first cross section and the second cross section.

Claim 25

Dependent Claim 103 words

An atherectomy device comprising a flexible drive shaft attached to an ablation burr, wherein the flexible drive shaft and the ablation burr are disposed about a central axis, the ablation burr has a first cross section spaced from a second cross section, wherein the second cross section has a larger cross sectional area than the first cross section, the ablation burr further having a first outer surface that extends between the first cross section and the second cross section, and extends inward toward the central axis relative to an imaginary line that extends between the first cross section and the second cross section.

Claim 26

Dependent Claim 19 words

An atherectomy device according to claim 19, wherein at least a portion of the first outer surface is abrasive.

Claim 27

Dependent Claim 66 words

An atherectomy device according to claim 19, further comprising a third cross section spaced relative to the second cross section, wherein the ablation burr includes a second outer surface that extends between the second cross section and the third cross section, and extends outward away from the central axis relative to an imaginary line that extends between the second cross section and the third cross section.

Claim 28

Dependent Claim 22 words

An atherectomy device according to claim 21, wherein at least a portion of the second outer surface includes a number of dimples.

Claim 29

Dependent Claim 37 words

An atherectomy device according to claim 22, wherein the ablation burr has a maximum cross section that corresponds to the maximum cross sectional area of the ablation burr, the maximum cross section intersecting the second outer surface.

Claim 30

Dependent Claim 23 words

An atherectomy device according to claim 19, wherein the first cross section is located adjacent to a distal end of the ablation burr.

Claim 31

Dependent Claim 20 words

An atherectomy device according to claim 24, wherein the second cross section is located proximal to the first cross section.

Claim 32

Dependent Claim 20 words

An atherectomy device according to claim 25, wherein the third cross section is located proximal to the second cross section.

Claim 33

Dependent Claim 224 words

An atherectomy device for removing unwanted deposits from a stent that is located in a lumen of a patient, comprising: a) a flexible drive shaft; b) an ablation burr attached to the flexible drive shaft, wherein the ablation burr is rotated and inserted through the stent to remove the unwanted deposits therein, the ablation burr and the flexible drive shaft being disposed about a central axis; c) the ablation burr further having: i. a first cross section spaced from a second cross section, wherein the second cross section has a larger cross sectional area than the first cross section; ii. a first outer surf ace that extends between the first cross section and the second cross section, and extends inward toward the central axis relative to an imaginary line that extends between the first cross section and the second cross section; iii. a third cross section spaced relative to the second cross section. wherein a second outer surface extends between the second cross section and the third cross section, and extends outward away from the central axis relative to an imaginary line that extends between the second cross section and the third cross section; and iv. a distal tip; wherein the distal tip and the second outer surface are constructed from a material that is softer than the material used to construct the stent.

Claim 34

Dependent Claim 224 words

An atherectomy device for removing unwanted deposits from a stent that is located in a lumen of a patient, comprising: a) a flexible drive shaft; b) an ablation burr attached to the flexible drive shaft, wherein the ablation burr is rotated and inserted through the stent to remove the unwanted deposits therein, the ablation burr and the flexible drive shaft being disposed about a central axis; c) the ablation burr further having: i. a first cross section spaced from a second cross section, wherein the second cross section has a larger cross sectional area than the first cross section; ii. a first outer surf ace that extends between the first cross section and the second cross section, and extends inward toward the central axis relative to an imaginary line that extends between the first cross section and the second cross section; iii. a third cross section spaced relative to the second cross section. wherein a second outer surface extends between the second cross section and the third cross section, and extends outward away from the central axis relative to an imaginary line that extends between the second cross section and the third cross section; and iv. a distal tip; wherein the distal tip and the second outer surface are constructed from a material that is softer than the material used to construct the stent.

Claim 35

Dependent Claim 37 words

An atherectomy device according to claim 27, wherein the ablation burr has a maximum cross section that corresponds to the maximum cross sectional area of the ablation burr, the maximum cross section intersecting the second outer surface.

Claim 36

Dependent Claim 19 words

An atherectomy device according to claim 28, wherein the distal tip and the second outer surface are relatively non-abrasive.

Claim 37

Dependent Claim 19 words

An atherectomy device according to claim 29, wherein at least a portion of the first outer surface is abrasive.

Claim 38

Dependent Claim 22 words

An atherectomy device according to claim 30, wherein at least a portion of the second outer surface includes a number of dimples.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	2003-01-17	2003-07-19	2004-01-18	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2007-01-17	2007-07-19	2008-01-18	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2011-01-17	2011-07-19	2012-01-18	$7700.00	Window Closed / Lapsed

Atherectomy device for reducing damage to vessels and/or in-vivo stents

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