IMPLANT FOR THE SPINAL COLUMN AND ACTUATING INSTRUMENT

• US 20130197648A1
• Filed: 07/25/2011
• Published: 08/01/2013
• Est. Priority Date: 10/11/2010
• Status: Active Grant

• Current Assignee: Heinrich Boehm
• Original Assignee: Heinrich Boehm
• Inventors: Boehm, Heinrich, Burger, Andreas, Wenzler, Klaus
• Granted Patent: US 9,308,098 B2
• Time in Patent Office: Days
• US Class Current: 623/17.16
• CPC Class Codes: A61F 2/44 for the spine, e.g. vertebrae, spinal discs
• CPC Class Codes: A61F 2/442 Intervertebral or spinal discs, e.g. resilient non-disc-shaped intervertebral inflatable pockets A61F2/441; non-disc-shaped intervertebral fusion implants A61F2/4455
• CPC Class Codes: A61F 2/447 substantially parallelepipedal, e.g. having a rectangular or trapezoidal cross-section
• CPC Class Codes: A61F 2/4603 for insertion or extraction of endoprosthetic joints or of accessories thereof
• CPC Class Codes: A61F 2/4611 of spinal prostheses
• CPC Class Codes: A61F 2/4637 for connecting or disconnecting two parts of a prosthesis
• CPC Class Codes: A61F 2002/2835 Bone graft implants for filling a bony defect or an endoprosthesis cavity, e.g. by synthetic material or biological material
• CPC Class Codes: A61F 2002/30153 rectangular
• CPC Class Codes: A61F 2002/30484 Mechanically expandable devices located on the first prosthetic part for locking into or onto the second prosthetic part
• CPC Class Codes: A61F 2002/30507 using a threaded locking member, e.g. a locking screw or a set screw
• CPC Class Codes: A61F 2002/3052 unrestrained in only one direction, e.g. moving unidirectionally
• CPC Class Codes: A61F 2002/30522 releasable, e.g. using a releasable ratchet
• CPC Class Codes: A61F 2002/3055 for adjusting length
• CPC Class Codes: A61F 2002/30579 with mechanically expandable devices, e.g. fixation devices
• CPC Class Codes: A61F 2002/30593 hollow
• CPC Class Codes: A61F 2002/30594 slotted, e.g. radial or meridian slot ending in a polar aperture, non-polar slots, horizontal or arcuate slots
• CPC Class Codes: A61F 2002/30616 Sets comprising a plurality of prosthetic parts of different sizes or orientations
• CPC Class Codes: A61F 2002/30785 parallel
• CPC Class Codes: A61F 2002/30843 Pyramidally-shaped
• CPC Class Codes: A61F 2002/30904 serrated profile, i.e. saw-toothed
• CPC Class Codes: A61F 2002/4635 : using minimally invasive surgery
• CPC Class Codes: A61F 2220/0025 : Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2250/0007 : for adjusting length

Abstract

The invention relates to an implant device, comprising an actuating instrument (110) and a height-adjustable implant (10) having a substantially U-shaped inner basket (11) and a U-shaped outer basket (60), wherein the inner basket (11) of the implant (10) is embraced by the outer basket (60) and telescopically guided, and the inner basket (11) and outer basket (60) are equally aligned, and wherein the limb (12, 13) of the inner basket (11) and the limb (61, 62) of the outer basket (60) are aligned so that a substantially continuous lateral opening (80) results, and the inner (11) and outer (60) baskets can be fixed with respect to each other in a predetermined end position, and wherein vertebral support surfaces are provided on the end faces (18, 63) of the baskets (11, 60), wherein the actuating instrument (110) has a fixation rod (111) and an expansion mechanism with sliding elements (122), and the inner basket (11) and fixation rod (111) have corresponding elements (26, 112), by means of which a detachable, rigid connection between the fixation rod (111) and inner basket (11) is achieved, and wherein by actuating the expansion mechanism on the actuating instrument, the outer basket (60) can be moved in the longitudinal direction (L) by the engagement of the sliding elements (122) at the limbs (61, 62) opposite the inner basket (61).

Claims

1. An implant device comprising an actuating instrument and a height-adjustable implant having a substantially U-shaped inner cage and a U-shaped outer cage, wherein the inner cage of the implant is embraced by the outer cage and telescopically guided, and the inner cage and the outer cage are equally aligned, and wherein the limbs of the inner cage and the limbs of the outer cage are aligned such that a substantially continuous lateral opening results that lies opposite the bottoms of the two cages, and the inner and outer cages can be fixed with respect to each other in a predetermined end position, and wherein vertebral support surfaces are provided on the front faces of the cages, characterized in that the actuating instrument has a fixation rod and an expansion mechanism with sliding elements, and the inner cage and the fixation rod have corresponding elements, by means of which a releasable, rigid connection between the fixation rod and the inner cage is achieved, and wherein, by actuating the expansion mechanism on the actuating instrument, the outer cage can be moved in the longitudinal direction relative to the inner cage by engagement of the sliding elements on the limbs.

2. The implant device as claimed in claim 1, characterized in that one of the corresponding elements is a bore with thread in the bottom of the inner cage.

3. The implant device as claimed in claim 1, characterized in that one of the corresponding elements is an outer thread on the fixation rod.

4. The implant device as claimed in claim 1, characterized in that, on the outsides of the limbs of the inner cage, a support surface is provided which extends in the longitudinal direction and on which the sliding elements are supported during the actuation of the expansion mechanism of the actuating instrument.

5. The implant device as claimed in claim 1, characterized in that, on the side of the limbs that lies opposite the front face of the outer cage, a step is provided which serves to support the ends of the sliding elements of the actuating instrument.

6. The implant device as claimed in claim 1, characterized in that the outer cage has a bridging web which bridges the lateral opening and which is rigidly connected to the limbs and comprises recesses for receiving instruments.

7. The implant device as claimed in claim 1, characterized in that corresponding elements are provided on the limbs of the cages and serve to guide the expansion movement of the two cages in a movement that follows the lordotic shape.

8. The implant device as claimed in claim 7, characterized in that the elements are corresponding support surfaces or openings with projections guided into the openings.

9. The implant device as claimed in claim 8, characterized in that the support surfaces and/or the openings and/or the projections along the longitudinal axis are in a form slightly deviating from the straight.

10. The implant device as claimed in claim 1, characterized in that the inner cage has an oblong hole in the bottom and the outer cage has openings in the bottom, and a screw connects the cages through the openings.

11. The implant device as claimed in claim 1, characterized in that the limbs have openings and/or the bottoms have openings and/or the vertebral support surfaces have openings, which allow bone to grow through.

12. The implant device as claimed in claim 1, characterized in that the outer thread of the fixation rod is provided on the rod end.

13. The implant device as claimed in claim 1, characterized in that the sliding elements and the expansion mechanism are provided near the end of the rod.

14. The implant device as claimed in claim 1, characterized in that the expansion mechanism comprises a force transmission element with an oblique pressing surface, the lever elements, which comprise the sliding elements, are mounted pivotably about an axis, and the upper ends of the lever elements bear on the pressing surface in the rest state, and, when force is introduced by the pressure on the oblique pressing surface of the force transmission element, the sliding elements are pivoted out of the rest position.

15. The implant device as claimed in claim 1, characterized in that the expansion mechanism is displaceable relative to the fixation rod.

16. The implant device as claimed in claim 14, characterized in that the force transmission element is surrounded by a U-shaped housing with an oblong hole, and a guide pin is provided that passes through the force transmission element and is forcibly guided in the oblong hole.

17. The implant device as claimed in claim 16, characterized in that the lower end of the housing passes through an axis on which the lever elements are secured pivotably.

18. The implant device as claimed in claim 1, characterized in that the fixation rod has a threaded spindle, onto the outer thread of which an actuating sleeve can be screwed, wherein, by the screwing movement, the lower edge of the actuating sleeve presses the force transmission means downward in the direction of the rod end.

19. The implant device as claimed in claim 1, characterized in that the fixation rod has a fixation disk which is mounted so as to be rotatable near the rod end but not displaceable.

20. The implant device as claimed in claim 1, characterized in that the displacement path of the expansion mechanism along the fixation rod is limited by the fixation disk and the threaded spindle.

21. The implant device as claimed in claim 19, characterized in that the expansion mechanism, together with the fixation disk, is rotatable relative to the fixation rod.

22. The implant device as claimed in claim 19, characterized in that the expansion mechanism is not rotatable relative to the fixation disk.

23. The implant device as claimed in claim 1, characterized in that a retainer is also provided, which can be positioned on the recess on the bridging web.