Vertebral replacement and distraction device for placing said implant

• US 20060200244A1
• Filed: 02/05/2004
• Published: 09/07/2006
• Est. Priority Date: 02/05/2003
• Status: Active Grant

• Current Assignee: Scient'X
• Original Assignee: Scient'X
• Inventors: Assaker, Richard
• Granted Patent: US 7,819,920 B2
• Time in Patent Office: Days
• US Class Current: 623/17.150
• CPC Class Codes: A61F 2/44 for the spine, e.g. vertebrae, spinal discs
• CPC Class Codes: A61F 2/4455 for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages intervertebral discs A61F2/442
• 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 2002/30131 horseshoe- or crescent- or C-shaped or U-shaped
• CPC Class Codes: A61F 2002/30235 tubular, e.g. sleeves
• 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 2002/30487 Circumferential cooperating grooves and beads on cooperating lateral surfaces of a mainly longitudinal connection
• 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 2002/30525 Worm gears
• CPC Class Codes: A61F 2002/30538 for adjusting angular orientation
• CPC Class Codes: A61F 2002/3055 for adjusting length
• CPC Class Codes: A61F 2002/30593 hollow
• CPC Class Codes: A61F 2002/30601 telescopic
• CPC Class Codes: A61F 2002/30777 Oblong apertures
• CPC Class Codes: A61F 2002/30787 inclined obliquely with respect to each other
• CPC Class Codes: A61F 2002/30789 perpendicular with respect to each other
• CPC Class Codes: A61F 2002/30841 : Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
• CPC Class Codes: A61F 2002/30904 : serrated profile, i.e. saw-toothed
• CPC Class Codes: A61F 2002/4622 : having the shape of a forceps or a clamp
• CPC Class Codes: A61F 2002/4627 : with linear motion along or rotating motion about the instrument axis or the implantation direction, e.g. telescopic, along a guiding rod, screwing inside the instrument
• CPC Class Codes: A61F 2002/4628 : with linear motion along or rotating motion about an axis transverse to the instrument axis or to the implantation direction, e.g. clamping
• CPC Class Codes: A61F 2002/4635 : using minimally invasive surgery
• CPC Class Codes: A61F 2002/4638 : Tools for performing screwing, e.g. nut or screwdrivers, or particular adaptations therefor
• CPC Class Codes: A61F 2220/0025 : Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2230/0013 : Horseshoe-shaped, e.g. crescent-shaped, C-shaped, U-shaped
• CPC Class Codes: A61F 2230/0069 : cylindrical
• CPC Class Codes: A61F 2250/0006 : for adjusting angular orientation

Abstract

The subject of the invention concerns a vertebral replacement implant comprising: two longitudinal elements slidably mounted with respect to each other,

• • and locking means (8) comprising:
    • on one of the elements, an anchor surface (10), and on the other element:
      • an anchor shoe (12) guided in translation to take up a first position in which the elements slide freely with respect to each other, and a second position in which the anchor shoe (12) cooperates with the anchor surface (10) to lock the elements together,
      • a system (15) converting a rotational movement into a translational movement transmitted to the anchor shoe (12).

Claims

1. - Vertebral replacement implant comprising:

two hollow, longitudinal elements, so-called male (2) and female (3) slidably mounted with respect to one another along a common longitudinal axis (X),

and means (8) ensuring the locking and free sliding of the elements between each other, characterized in that the locking means (8) comprise;

on one of the elements, an anchor surface (10) arranged on a longitudinal part of said element,

and on the other of the elements;

an anchor shoe (12) guided in translation to take up a first position in which the elements (2, 3) slide freely with respect to each other, and a second position in which the anchor shoe (12) cooperates with the anchor surface (10) to lock the elements (2, 3) together,

a system (15) for converting a rotational movement into a translational movement transmitted to the anchor shoe (12), the movement conversion system (15) being provided with receiving means (16) to receive an instrument commanding rotation in the two opposite directions so that the anchor shoe (12) takes up one of the positions in relation to the direction of the rotation command.

2. - Vertebral replacement implant as in claim 1, characterized in that the movement conversion system (15) is of screw/nut type.

3. - Vertebral replacement implant as in claim 2, characterized in that the conversion system of screw/nut type (15) comprises a pin (17) guided in rotation and locked in translation, this pin (17) being provided with a threaded part (25) cooperating with tapping (26) on the anchor shoe (12) guided in translation and locked in rotation.

4. - Vertebral replacement implant as in claim 3, characterized in that the pin (17) extends diametrically inside the male element (2) and comprises:

a first end (18) provided with receiving means (16) to receive the command instrument, this first end being guided in rotation and locked in translation in a wall of the male element,

a second end (27) provided with the threaded part (25) cooperating with the tapping (26) of the anchor shoe which is guided in translation and locked in rotation in the opposite wall of the male element.

5. - Vertebral replacement implant as in claim 4, characterized in that the means (16) receiving the command instrument lead into a lumen (6) arranged in a wall of the female element (3) so as to be accessible from outside the implant, the wall of the female element (3) being provided on the inside, in its part opposite the part having the lumen, with the anchor surface (10).

6. - Vertebral replacement implant as in any of claims 1 to 5, characterized in that each male (2) and female (3) element is provided with an end wall (2_a, 3_a) intended to cooperate with a vertebral plateau.

7. - Vertebral replacement implant as in claim 6, characterized in that at least one end wall (2_a, 3_a) is equipped with a system (30) for inclining the end wall in the sagittal plane.

8. - Vertebral replacement implant as in claim 7, characterized in that the inclining system (30) is of screw/nut type and comprises a threaded rod (31) guided in rotation and locked in translation to cooperate with a tapped ring (32) locked in rotation and connected to the end wall guided in its incline.

9. - Vertebral replacement implant as in claim 8, characterized in that the threaded rod (31) extends diametrically inside one element and comprises means (48) for receiving a command instrument accessible from outside the element.

10. - Replacement implant as in any of claims 1 to 9, characterized in that each male (2) and female (3) element comprises grasping zones (50) for a distractor (51) ensuring the relative sliding between the male (2) and female (3) elements, these grasping zones (50) being formed of two flats extending in diametrical opposite manner on the male and female elements.

11. - Distractor to ensure the relative sliding between the male (2) and female (3) elements of a replacement implant (1) according to any of claims 1 to 10 and comprising grasping zones (50), the distractor comprising:

two jaws (58, 59) adapted to ensure gripping of the male (2) and female (3) elements via zones (50), mounted with mobile relative spacing,

and a system (62) for converting a rotational movement imposed by a handle into a jaw separating movement,

characterized in that one of the jaws (58) is mounted fixedly whilst the other jaw (59) is mounted mobile fashion being relatively spaced apart from the fixed jaw, and in that the movement conversion system (62) is ensured by a rack (65) connected to the mobile jaw (59) and cooperating with a toothed wheel (67) connected by a command rod (69) to a handle.

12. - Distractor as in claim 11, characterized in that the movement conversion system (62) is equipped with a no-return device (70) preventing movement in a direction contrary to the distancing of the male (2) and female (3) elements.

13. - Distractor as in claim 12, characterized in that the no-return device (70) can be released allowing movement in a direction in which the male (2) and female (3) elements are drawn together.