Percutaneous spinal implants and methods

• US 8,167,890 B2
• Filed: 10/30/2007
• Issued: 05/01/2012
• Est. Priority Date: 02/17/2005
• Status: Expired due to Fees

• Current Assignee: Kyphon SARL (Medtronic Plc)
• Original Assignee: Kyphon SARL (Medtronic Plc)
• Inventors: Malandain, Hugues F., Edidin, Avram Allan
• Primary Examiner(s): Robert, Eduardo C
• Assistant Examiner(s): CARTER, TARA ROSE E
• Application Number:
  US11/928,431
• Publication Number:
  US 20080051894A1
• Time in Patent Office: 1,645 Days
• Field of Search: 606246-249, 606/86.A, 606/99, 606/104, 623/17.11, 623 1714- 1716
• US Class Current: 606/99
• CPC Class Codes: A61B 17/025 Joint distractors
• CPC Class Codes: A61B 17/1604 Chisels; Rongeurs; Punches; Stamps
• CPC Class Codes: A61B 17/1608 the two jaw elements being linked to two elongated shaft elements moving longitudinally relative to each other
• CPC Class Codes: A61B 17/1671 for the spine
• CPC Class Codes: A61B 17/1757 for the spine
• CPC Class Codes: A61B 17/7047 Clamps comprising opposed elements which grasp one vertebra between them
• CPC Class Codes: A61B 17/7062 Devices acting on, attached to, or simulating the effect of, vertebral processes, vertebral facets or ribs rib fixation devices A61B17/8076; Tools for such devices
• CPC Class Codes: A61B 17/7065 Devices with changeable shape, e.g. collapsible or having retractable arms to aid implantation; Tools therefor
• CPC Class Codes: A61B 17/8863 Apparatus for shaping or cutting osteosynthesis equipment by medical personnel
• CPC Class Codes: A61B 2017/00557 inflatable A61B2017/22051 takes precedence
• CPC Class Codes: A61B 2017/0256 for the spine

Abstract

A method includes moving a spinal implant such that a central portion of the spinal implant is disposed between adjacent spinous processes, radially extending a proximal portion of the spinal implant on a first side of the adjacent spinous processes such that movement of the proximal portion between the adjacent spinous processes is inhibited, and radially extending a distal portion of the spinal implant on a second side of the adjacent spinous processes opposite the first side such that movement of the distal portion between the adjacent spinous processes is inhibited.

Claims

1. An apparatus, comprising:

an implant having a first portion configured to be disposed between adjacent spinous processes;

an expansion tool having a housing, a cam actuator and an object rotatable mounted to the housing, the expansion tool configured to deform a second portion of the implant when the expansion tool is disposed within an interior of the implant and the cam actuator is rotated relative to the object;

wherein the object is eccentrically coupled to the housing, the cam actuator having an arm configured to move a first end portion of the object, a second end portion of the object configured to contact the implant when the cam actuator is rotated.

2. The apparatus of claim 1, wherein a cross-sectional size of the

second portion of implant without deformation being less than a cross-sectional size of the second portion of the implant with deformation.

3. An apparatus, comprising:

an implant having a first portion configured to be disposed between adjacent spinous processes;

an expansion tool having a housing, a cam actuator and an object rotatable mounted to the housing, the expansion tool configured to deform a second portion of the implant when the expansion tool is disposed within an interior of the implant and the cam actuator is rotated relative to the object;

wherein the second portion of the implant is disposed between the first portion of the implant and a distal end of the implant.

4. An apparatus, comprising:

an implant having a first portion configured to be disposed between adjacent spinous processes;

an expansion tool having a housing, a cam actuator and an object rotatably mounted to the housing, the expansion tool configured to deform a second portion of the implant when the expansion tool is disposed within an interior of the implant and the cam actuator is rotated relative to the object;

wherein the second portion of the implant is disposed between the first portion of the implant and a proximal end of the implant.

5. A kit including:

an apparatus comprising;

an elongate member having a portion configured to be disposed between adjacent spinous processes;

a housing disposed at a distal end portion of the elongate member;

a cam actuator moveably coupled to the housing;

an object rotatably mounted to the housing, the cam actuator and the object collectively having a first configuration and a second configuration, a cross-sectional maximum length of the cam actuator and the object in the first configuration being less than a cross-sectional maximum length of the cam actuator and the object in the second configuration;

an implant having a first portion configured to be disposed between the adjacent spinous processes, the first portion of the implant being associated with the portion of the elongate member;

the implant having a second portion configured to be deformed by a distal end of the object when the cam actuator and the object are in the second configuration.

6. The apparatus of claim 5, wherein:

the cam actuator is coupled to the elongate member such that the cam actuator is rotated as the elongate member is rotated; and

the object is rotatably mounted to the housing such that object rotates when the cam actuator is rotated.

7. The apparatus of claim 5, wherein the portion of the elongate member is disposed between the distal end of the elongate member and a proximal end of the elongate member.

8. An apparatus, comprising:

an implant having a first portion configured to be disposed between adjacent spinous processes; and

an expansion tool having a cam actuator operatively coupled to an eccentrically mounted object, the expansion tool configured to deform a second portion of the implant when the expansion tool is disposed within an interior of the implant and the cam actuator is rotated from a first position to a second position, a cross-sectional maximum length of the cam actuator and the object when the cam actuator is in the first position being less than a cross-sectional maximum length of the cam actuator and the object when the cam actuator is in the second position.

9. The apparatus of claim 8, wherein:

a cross-sectional maximum length of the implant is greater than the cross-section maximum length of the cam actuator and the object when the cam actuator is in the first position; and

the cross-sectional maximum length of the implant is greater than the cross-section maximum length of the cam actuator and the object when the cam actuator is in the second position.

10. The apparatus of claim 8, wherein the object is a first eccentrically mounted object, the cam actuator is operatively coupled to a second eccentrically mounted object, a cross-sectional maximum length of the cam actuator, the first object and the second object when the cam actuator is in the first position being less than a cross-sectional maximum length of the cam actuator, the first object and the second object when the cam actuator is in the second position.

11. A method, comprising:

disposing a first portion of an implant between adjacent spinous processes;

inserting at least a distal end portion of an expansion tool into an interior of the implant;

the expansion tool having a cam actuator operatively coupled to an eccentrically mounted object;

rotating the cam actuator of the expansion tool from a first position to a second position such that a second portion of the implant is deformed by the eccentrically mounted object, the second portion of the implant being between an end of the implant and the first portion of the implant; and

wherein a cross-sectional maximum length of the cam actuator and the eccentrically mounted object is less in the first position than in the second position.

12. The method of claim 11, further comprising:

rotating the expansion tool, after the rotating the cam actuator, about a longitudinal axis of the expansion tool for a full rotation.

13. The method of claim 11, wherein the end of the implant is the distal end of the implant.

14. The method of claim 11, further comprising:

rotating the cam actuator from the second position to the first position; and

removing the expansion tool from the interior of the implant.

15. The method of claim 11, wherein the inserting includes inserting the expansion tool to a first longitudinal position, and the method further comprises:

rotating the cam actuator from the second position to the first position;

moving the expansion tool from the first longitudinal position to a second longitudinal position;

after moving, rotating the cam actuator from the first position to the rotational position such that a third portion of the implant is deformed, the first portion of the implant being between the second portion of the implant and the third portion of the implant;

rotating the cam actuator from the second position to the first position; and

removing the expansion tool from the interior of the implant.

16. A method, comprising:

disposing a first portion of an implant between adjacent spinous processes;

inserting at least a distal end portion of an expansion tool into an interior of the implant;

the expansion tool having a cam actuator operatively coupled to an eccentrically mounted object;

rotating the cam actuator of the expansion tool from a first position to a second position such that a second portion of the implant is deformed by the eccentrically mounted object;

the second portion of the implant being between an end of the implant and the first portion of the implant;

rotating the cam actuator of the expansion tool such that a third portion of the implant is deformed, the first portion of the implant being between the second portion of the implant and the third portion of the implant;

wherein a cross-sectional maximum length of the cam actuator and the eccentrically mounted object is less in the first position than in the second position.

17. The method of claim 16, further comprising:

rotating the expansion tool, after the rotating the cam actuator with respect to the second portion of the implant, about a longitudinal axis of the expansion tool for a full rotation; and

rotating the expansion tool, after the rotating the cam actuator with respect to the third portion of the implant, about the longitudinal axis of the expansion tool for a full rotation.

18. The method of claim 16, wherein the first portion of the implant, the second portion of the implant and third portion of the implant substantially correspond before the rotating the cam actuator with respect to the second portion of the implant and before the rotating the cam actuator with respect to the third portion of the implant.

19. The method of claim 16, wherein:

a cross-sectional size of the second portion of the implant before the rotating with respect to the second portion of the implant is less than a cross-sectional size of the second portion of the implant after the rotating with respect to the second portion; and

a cross-sectional size of the third portion of the implant before the rotating with respect to the third portion of the implant is less than a cross-sectional size of the third portion of the implant after the rotating with respect to the third portion.