Assembly for crimping an intraluminal device or measuring the radial strength of the intraluminal device and method of use

• US 6,651,478 B1
• Filed: 11/28/2001
• Issued: 11/25/2003
• Est. Priority Date: 08/10/2000
• Status: Expired due to Fees

• Current Assignee: Advanced Cardiovascular Systems Incorporated
• Original Assignee: Advanced Cardiovascular Systems Incorporated
• Inventors: Kokish, Arkady
• Primary Examiner(s): Crane, Daniel C.
• Application Number:
  US09/997,783
• Time in Patent Office: 727 Days
• Field of Search: 724/02, 292/37, 292/82, 292/835, 606/1
• US Class Current: 72/402
• CPC Class Codes: A61F 2/9522 Means for mounting a stent or stent-graft onto or into a placement instrument
• CPC Class Codes: A61F 2/9524 Iris-type crimpers
• CPC Class Codes: A61F 2/958 Inflatable balloons for placing stents or stent-grafts
• CPC Class Codes: Y10T 29/53996 by deforming

Abstract

An assembly is provided which can crimp or compress an intraluminal device or measure the radial strength of an intraluminal device. The device includes a stationary disk and a drive disk for imparting movement to a number of wedges attached to linear sliders on the stationary disk. As rotational movement is imparted by the drive disk to the wedges, the wedges move in a linear direction to form a crimping motion for use in crimping an intravascular intraluminal device onto a catheter or a mandrel. Alternatively, the same motion of the wedges is used to measure the radial strength of an intraluminal device.

Claims

1. An assembly for reducing the diameter of an intraluminal device, comprising:

a plurality of wedges, each wedge being spaced substantially equidistant from an adjacent wedge, wherein the spacing between wedges is uniform, each wedge having exterior edges that define an angle, such angle having a bisect;

each wedge being configured for movement in a direction substantially perpendicular to said bisect of said angle defined by said exterior edges for movement into and out of contact with the intraluminal device, wherein the wedges are associated with a stationary disk and a drive disk configured for rotational movement relative to the stationary disk, each wedge being attached to a linear slider mounted on the stationary disk, whereby, as the drive disk is rotated, the apex of the wedges move in a direction that is perpendicular to said bisect and as the apex of each wedge continues to move linearly , the apexes of the wedges move from an open position toward a closed position until the apexes come into contact with the intraluminal device.

2. The assembly of claim 1, wherein the drive disk has a closed rotational position where all of the apexes of the wedges form an opening having a diameter corresponding to the diameter of the crimped intraluminal device.

3. The assembly of claim 1, wherein the drive disk has an open rotational position where all of the apexes of the wedges are spaced apart.

4. The assembly of claim 1, wherein each wedge has a first side and a second side.

5. The assembly of claim 1, wherein a parallel gap is defined by the first side of the first wedge and the first side of the second wedge when the drive disk is in an open rotational position.

6. The assembly of claim 1, wherein the linear slider includes a carriage and a base.

7. The assembly of claim 6, wherein the carriage is attached to the stationary disk.

8. The assembly of claim 6, wherein the base is slidably mounted in the carriage.

9. The assembly of claim 6, wherein the base is attached to a wedge.

10. The assembly of claim 1, wherein a roller bearing transmits rotational movement from the drive disk to the wedge.

11. The assembly of claim 1, wherein the rotational movement translates to linear movement by the linear slider attached to the wedge.

12. The assembly of claim 1, wherein the linear movement translates to the apex of each wedge so that the apex travels linearly in a direction perpendicular to said bisect of said angle defined by the exterior edges of the wedge.

13. The assembly of claim 1, wherein the drive disk and the stationary disk are rotated a preselected number of degrees N and the intraluminal device diameter is reduced.

14. The assembly of claim 13, wherein the drive disk and the stationary disk are repeatedly rotated N degrees and the intraluminal device diameter is further reduced at each N degrees position.

15. The assembly of claim 14, wherein the number of degrees of rotation N is variable from about 1°

to about 20°

.

16. The assembly of claim 13, wherein the number of degrees of rotation N is 5°

.

17. The assembly of claim 13, wherein the rotation of the drive disk and the stationary disk in one direction only.

18. The assembly of claim 13, wherein the drive disk and the stationary disk rotate in either direction.

19. An assembly for crimping an intraluminal device onto a catheter, comprising:

a stationary disk having a front face and a rear face;

a drive disk configured for rotational movement relative to the stationary disk and having a front face and a rear face;

a plurality of linear sliders attached to the front face of the stationary disk;

a plurality of wedges, each wedge having an apex and having exterior edges that define an angle, such angle having a bisect;

each wedge being spaced substantially equidistant from an adjacent wedge, wherein the spacing between wedges is uniform, and each wedge being attached to a linear slider and to the drive disk;

whereby as the drive disk is rotated, the apex of the wedges move in a direction that is perpendicular to said bisect and as the apex of each wedge continues to move linearly, the apexes of the wedges moving from an open position toward a closed position until the apexes come into crimping contact with the intraluminal device so that the intraluminal device is tightly crimped onto the catheter.

20. The assembly of claim 19, wherein at least three wedges are used for crimping the intraluminal device onto the catheter.

21. The assembly of claim 19, wherein eight wedges are used to crimp the intraluminal device onto the catheter.

22. The assembly of claim 19, wherein a plurality of brackets are positioned between the plurality of wedges and the plurality of linear sliders, the brackets being attached to the wedges and to the linear sliders.

23. The assembly of claim 19, wherein the spacing between wedges is predetermined.

24. The assembly of claim 19, wherein the spacing between wedges provides substantially frictionless movement among the wedges.

25. The assembly of claim 19, wherein the drive disk has a closed rotational position where all of the apexes of the wedges form an opening having a diameter corresponding substantially to the diameter of the crimped intraluminal device.

26. The assembly of claim 19, wherein the drive disk has an open rotational position where all of the apexes of the wedges are spaced apart.

27. The assembly of claim 19, wherein each wedge has a first side and a second side.

28. The assembly of claim 27, wherein the first side of a first wedge is substantially parallel to a first side of a second edge and positioned 180°

on the drive disk from the first wedge.

29. The assembly of claim 28, wherein a parallel gap is defined by the first side of the first wedge and the first side of the second wedge when the drive disk is in an open rotational position.

30. The assembly of claim 19, wherein the linear slider includes a carriage and a base.

31. The assembly of claim 30, wherein the carriage is attached to the stationary disk.

32. The assembly of claim 30, wherein the base is slidably mounted in the carriage.

33. The assembly of claim 30, wherein the base is attached to a wedge.

34. The assembly of claim 19, wherein a roller bearing transmits rotational movement from the drive disk to the bracket and the wedge.

35. The assembly of claim 34, wherein the rotational movement translates to linear movement by the linear slider attached to the bracket and to the wedge.

36. The assembly of claim 35, wherein the linear movement translates to the apex of each wedge so that the apex travels linearly in a direction perpendicular to said bisect of said exterior edges of the wedge.

37. The assembly of claim 19, wherein the drive disk and the stationary disk are rotated a preselected number of degrees N and the intraluminal device diameter is reduced.

38. The assembly of claim 37, wherein the drive disk and the stationary disk are repeatedly rotated N degrees and the intraluminal device diameter is further reduced at each N degrees position.

39. The assembly of claim 38, wherein the number of degrees of rotation N is variable from about 1°

to about 20°

.

40. The assembly of claim 37, wherein the number of degrees of rotation N is 5°

.

41. The assembly of claim 37, wherein the rotation of the drive disk and the stationary disk in one direction only.

42. The assembly of claim 37, wherein the drive disk and the stationary disk rotate in either direction.

43. The assembly of claim 19, wherein the rotational force imparted to the drive disk is mechanical.

44. The assembly of claim 43, wherein the mechanical force is applied by a lever attached to a shaft and which is associated with the drive disk.

45. The assembly of claim 19, wherein the rotational force is imparted to the drive disk hydraulically.

46. The assembly of claim 19, wherein the rotational force is imparted to the drive disk pneumatically.

47. The assembly of claim 19, wherein the rotational force is imparted to the drive disk electrically.

48. The assembly of claim 47, wherein the electrical force is derived from an electrical motor associated with the drive disk.

49. The assembly of claim 19, wherein rotation of the drive disk from an open to a closed position is limited.

50. The assembly of claim 49, wherein the rotational limits are controlled by mechanical stop.

51. The assembly of claim 49, wherein the rotational limits are controlled by electronic switches.

52. A method for compressing an intraluminal device onto a catheter, a mandrel or a sheath, comprising:

providing an intraluminal device compressing assembly having a drive disk providing for rotational movement and a stationary disk, both disks being mounted on a base, a plurality of wedges attached to a corresponding plurality of linear sliders on the stationary disk, each wedge being spaced substantially equidistant from an adjacent wedge, wherein the spacing between wedges is uniform, each of the wedges having an apex and exterior edges that define an angle, said angle having a bisect;

imparting rotational movement to the drive disk which translates to linear movement to the wedges so that the apexes of the wedges form an opening and wherein the apexes of the wedges move in a linear direction that is perpendicular to said bisect of each corresponding wedge;

providing an intraluminal device pre-mounted on a catheter and positioning the intraluminal device within the opening;

imparting rotational movement to the drive disk which translates to linear movement to the wedges so that the apexes of the wedges move linearly toward a closed position and into contact with the intraluminal device;

compressing the intraluminal device onto the catheter, mandrel or sheath by continuing to move the apexes of the wedges in a linear direction toward the closed position and into contact with the intraluminal device;

imparting rotational movement to the drive disk which translates to linear motion to move the apexes of the wedges in a linear direction toward the open position; and

removing the intraluminal device and catheter or mandrel or sheath from the intraluminal device compressing assembly.

53. An assembly for crimping an intraluminal device onto a catheter, comprising:

a stationary disk having a front face and a rear face;

means for providing rotational movement relative to the stationary disk;

a plurality of linear sliders attached to the front face of the stationary disk;

a plurality of wedges, each wedge being spaced substantially equidistant from an adjacent wedge, wherein the spacing between wedges is uniform, each wedge having an apex and exterior edges defining an angle, said angle having bisect;

each wedge being attached to a linear slider and to the means for providing rotational movement;

whereby as rotational movement is provided, the apex of the wedges move in a direction that is perpendicular to said bisect and as the apex of each wedge continues to move linearly, the apexes of the wedges moving from an open position toward a closed position until the apexes come into crimping contact with the intraluminal device so that the intraluminal device is tightly crimped onto the catheter.

54. The assembly of claim 53, wherein the means for providing rotational movement includes a drive disk.

55. An assembly for measuring the radial strength of a intraluminal device, comprising:

a stationary disk having a front face and a rear face;

a drive disk configured for rotational movement relative to the stationary disk and having a front face and a rear face;

a plurality of linear sliders attached to the front face of the stationary disk;

a plurality of wedges, each wedge having an apex and having exterior edges that define an angle, said angle having a bisect;

each wedge being positioned equidistant from an adjacent wedge, wherein the spacing between wedges is uniform, and each wedge being attached to a linear slider and to the drive disk;

whereby as the drive disk is rotated, the apex of the wedges move in a direction that is perpendicular to said bisect and as the apex of each wedge continues to move linearly, the apexes of the wedges moving from an open position toward a closed position until the apexes come into crimping contact with the intraluminal device so that the radial strength of the intraluminal device can be measured.

56. The assembly of claim 55, wherein at least three wedges are used for contacting the intraluminal device.

57. The assembly of claim 55, wherein eight wedges are used for contacting the intraluminal device.

58. The assembly of claim 55, wherein a plurality of brackets are positioned between the plurality of wedges and the plurality of linear sliders, the brackets being attached to the wedges and to the linear sliders.

59. The assembly of claim 55, wherein the spacing between wedges is predetermined.

60. The assembly of claim 55, wherein the spacing between wedges provides substantially frictionless movement among the wedges.

61. The assembly of claim 55, wherein the drive disk has a closed rotational position where all of the apexes of the wedges form an opening having a diameter corresponding to an unexpanded diameter of the intraluminal device.

62. The assembly of claim 55, wherein the drive disk has an open rotational position where all of the apexes of the wedges are spaced apart.

63. The assembly of claim 55, wherein each wedge has a first side and a second side.

64. The assembly of claim 63, wherein the first side of a first wedge is substantially parallel to a first side of a second edge and positioned 180°

on the drive disk from the first wedge.

65. The assembly of claim 64, wherein a parallel gap is defined by the first side of the first wedge and the first side of the second wedge when the drive disk is in an open rotational position.

66. The assembly of claim 55, wherein the linear slider includes a carriage and a base.

67. The assembly of claim 66, wherein the carriage is attached to the stationary disk.

68. The assembly of claim 66, wherein the base is slidably mounted in the carriage.

69. The assembly of claim 66, wherein the base is attached to a wedge.

70. The assembly of claim 55, wherein a roller bearing transmits rotational movement from the drive disk to the bracket and the wedge.

71. The assembly of claim 70, wherein the rotational movement translates to linear movement by the linear slider attached to the bracket and to the wedge.

72. The assembly of claim 55, wherein the linear movement translates to the apex of each wedge so that the apex travels linearly in a direction perpendicular to said bisect of said angle defined by said exterior edges.

73. The assembly of claim 55, wherein the radial strength of the intraluminal device is determined by the geometric position of wedges.