Stent crimping system

• US 7,628,051 B1
• Filed: 05/22/2007
• Issued: 12/08/2009
• Est. Priority Date: 07/26/2004
• Status: Expired due to Fees

• Current Assignee: Abbott Laboratories
• Original Assignee: Abbott Laboratories
• Inventors: Shumer, Dan, Baron, Scott, Lowe, David, Kokish, Arkady
• Primary Examiner(s): Ross; Dana
• Assistant Examiner(s): EKIERT, TERESA M
• Application Number:
  US11/752,115
• Time in Patent Office: 931 Days
• Field of Search: 722/93, 722/95, 722/96, 722/97, 724/02
• US Class Current: 72/402
• CPC Class Codes: A61F 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts
• 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: B25B 27/10 inserting fittings into hoses
• CPC Class Codes: Y10T 29/49764 with testing or indicating
• CPC Class Codes: Y10T 29/49865 by temperature differential [e.g., shrink fit]

Abstract

A stent crimping apparatus is provided which includes a crimping assembly adapted to crimp the stent, a clamp assembly configured to secure the medical device; and a control unit configured to control the movement of the crimp assembly. The clamp assembly includes a lower clamp device defining a seating groove formed and dimensioned to seat a portion of the medical device therein, and a retaining assembly having an elastomeric member. This elastomeric member defines a contacting groove oriented in an opposed manner proximate to at least a portion of the seating groove. The clamp assembly further includes an actuation mechanism associated with the retaining assembly and the lower clamp device such that operation thereof causes the retaining assembly to move between an opened condition and a closed condition. In the opened condition, the medical device can be positioned between the lower clamp device and the retaining assembly, and in the closed condition, retaining the medical device between the contacting groove of the elastomeric member and the seating groove of the lower clamp device.

Claims

1. A stent crimping apparatus for use in crimping a stent onto a medical device, said apparatus comprising:

a crimping assembly adapted to crimp the stent from a first diameter to a reduced second diameter;

a clamp assembly configured to secure the medical device, wherein said clamp assembly includes;

a lower clamp device defining a seating groove formed and dimensioned to seat a portion of the medical device therein;

a retaining assembly having an elastomeric member, said elastomeric member defining a contacting groove oriented in an opposed manner proximate to at least a portion of the seating groove;

an actuation mechanism associated with the retaining assembly and the lower clamp device such that operation thereof causes the retaining assembly to move between an opened condition, enabling positioning of the medical device between the lower clamp device and the retaining assembly, and a closed condition, retaining the medical device between the contacting groove of the elastomeric member and the seating groove of the lower clamp device;

a pivot lever rotatably mounted to said lower clamp device, said pivot lever cooperating between the actuation mechanism and the retaining assembly for movement of said retaining assembly between the opened condition and the closed condition; and

a control unit configured to control the movement of the crimp assembly.

2. The crimping apparatus according to claim 1, wherein

said pivot lever includes a proximal portion and a distal portion, and

said lower clamp device includes a pivot pin about which said pivot lever is rotatably supported between the proximal portion and the distal portion thereof.

3. The crimping apparatus according to claim 2, wherein

said retaining assembly being coupled to said pivot lever proximal the distal portion of said lever member, and

said actuation mechanism cooperating with said pivot lever proximal the proximal portion thereof such that when said actuation mechanism is moved from a first position towards a second position, said pivot lever is caused to rotate about a rotational axis of the pivot pin which causes the retaining assembly to move from the opened condition toward the closed condition.

4. The crimping apparatus according to claim 3, wherein

said lower clamp device includes a base portion and a support plate extend distally from the base portion, said seating groove extending along an upper edge portion thereof from the base portion to the support plate, and

said retaining assembly includes a pair of plate members mounted to, and depending downwardly from, the elastomeric member on opposite sides of the support plate, each said plate member coupled to said pivot lever at the distal portion thereof.

5. The crimping apparatus according to claim 4, wherein

said pivot lever includes a pair of lever portions disposed on opposite sides of the lower clamp device support plate, each lever portion pivotally mounted to a corresponding plate member through a securing pin extending therethrough.

6. The crimping apparatus according to claim 5, wherein

said support plate includes an elongated slot upon which said securing pin passes therethrough, said elongated slot be configured to accommodate the travel of the securing pin as the retaining assembly reciprocates between the opened condition and the closed condition.

7. A crimping apparatus for use in crimping a stent onto a medical device, said apparatus comprising:

a crimping assembly adapted to crimp the stent from a first diameter to a reduced second diameter;

a clamp assembly configured to secure the medical device;

a control unit configured to control the movement of the crimp assembly, wherein said clamp assembly includes;

a lower clamp device defining a seating groove formed and dimensioned to seat a portion of the medical device therein;

a retaining assembly having an elastomeric member, said elastomeric member defining a contacting groove oriented in an opposed manner proximate to at least a portion of the seating groove; and

an actuation mechanism associated with the retaining assembly and the lower clamp device such that operation thereof causes the retaining assembly to move between an opened condition, enabling positioning of the medical device between the lower clamp device and the retaining assembly, and a closed condition, retaining the medical device between the contacting groove of the elastomeric member and the seating groove of the lower clamp device; and

an upper clamp device having a channel extending along a lower edge of device, said upper clamp device being configured to couple to said lower clamp device such that said seating groove and said channel cooperate to define a collective receiving channel.

8. A stent crimping apparatus for use in crimping a stent onto a medical device, said apparatus comprising:

a crimping assembly adapted to crimp the stent from a first diameter to a reduced second diameter;

a clamp assembly configured to secure the medical device; and

a control unit configured to control the movement of the crimp assembly,

said crimping assembly including;

a plurality of movable wedges having a respective first side and a second side converging to form a tip portion, said tip portions being arranged to collectively form an iris about a rotational axis thereof, said iris defining a crimp aperture about which said movable wedges are disposed, each said wedge being associated with a stationary structure and a rotational actuation unit such that during rotation of the actuation unit about the rotational axis, the iris is caused to rotate about the rotational axis, relative the stationary structure, for inward movement of the wedges to decrease the size of the crimp aperture and outward movement of the wedges to increase the size of the crimp aperture,

wherein each movable wedge has at least one end section rotatably coupled to the stationary structure for relative rotational displacement therebetween, and another section of the movable wedge linearly coupled to the actuation unit for substantially relative linear displacement therebetween, each wedge being rotatably coupled to the stationary structure at a position proximate to a distal portion of the respective wedge, and each wedge being linearly coupled to the actuation unit at a position proximate to a proximal portion of the respective wedge.

9. The crimping apparatus according to claim 8, wherein

the relative rotation displacement of each wedge is about a respective rotational axis that extends substantially parallel to the rotational axis of said iris, and the relative linear displacement of each wedge is in a direction that extends substantially perpendicular to a respective bisecting plane of each wedge.

10. The crimping apparatus according to claim 8, wherein

the rotational coupling of each wedge to the stationary structure further includes a respective linear displacement along a respective bisecting plane of each wedge for movement toward the aperture during said inward movement thereof, and movement away from the aperture during said outward movement thereof.

11. The crimping apparatus according to claim 10, wherein

said stationary structure includes at least one stationary end wall disposed adjacent the at least one end section of each wedge, and

for each wedge, one of the wedge end section and the stationary end wall including a respective bearing device about which the respective wedge rotates, and the other the stationary end wall and the respective wedge includes a corresponding elongated slot that slideably and rotatably receives a corresponding bearing device.

12. The crimping apparatus according to claim 8, wherein

said stationary structure includes at least one stationary end wall disposed adjacent the at least one end section of each wedge, and

said actuation unit includes a housing enclosing the plurality of movable wedges, said housing rotatably coupled to said stationary end wall for rotational displacement about the rotational axis of the iris.

13. The crimping apparatus according to claim 12, further including:

a respective slider mechanism coupling a respective wedge to the housing for said respective substantially linear displacement of the respective proximal portion of the wedge to the housing during said rotational displacement of the housing.

14. The crimping apparatus according to claim 13, wherein

said housing includes a cylindrical-shaped drum portion circumferentially surrounding said plurality of wedges, and at least one rotational end wall affixed to said drum portion, said rotational end wall further configured to rotatably couple to said stationary end wall for rotation of said housing about the rotational axis of the aperture as a unit.

15. The crimping apparatus according to claim 14, wherein

said stationary end wall defining a stent receiving port providing access to the aperture of the iris, and a first bearing surface, and

said rotational end wall defining a second bearing surface formed and dimensioned to rotatably engage the first bearing surface for rotational support of the housing.

16. The crimping apparatus according to claim 14, wherein

each respective slider mechanism slideably couples the respective wedge to the drum portion.

17. The crimping apparatus according to claim 12, wherein

said stationary end wall includes a plurality of bearing devices disposed about the rotational axis of the iris, each said bearing device being associated with one respective wedge, and

each wedge end section defining and elongated slot extending in a direction along the respective centerline of said wedge, each said elongated slot that slideably and rotatably receives a corresponding bearing device.