Vertebral compression clamp for surgical repair to damage to the spine

• US 5,395,370 A
• Filed: 10/16/1992
• Issued: 03/07/1995
• Est. Priority Date: 10/18/1991
• Status: Expired due to Term

• Current Assignee: PINA Vertriebs AG
• Original Assignee: PINA Vertriebs AG
• Inventors: Muller, Walter, Piotrowski, Georg
• Primary Examiner(s): Willse, David H.
• Application Number:
  US07/962,265
• Time in Patent Office: 872 Days
• Field of Search: 623/17, 606/61, 294/101, 294/116, 403/44
• US Class Current: 606/276
• CPC Class Codes: A61B 17/7005 Parts of the longitudinal elements, e.g. their ends, being specially adapted to fit in the screw or hook heads
• CPC Class Codes: A61B 17/7014 with means for adjusting the distance between two screws or hooks
• CPC Class Codes: A61B 17/704 the longitudinal element passing through a ball-joint in the screw head
• CPC Class Codes: A61B 17/7076 for driving, positioning or assembling spinal clamps or bone anchors specially adapted for spinal fixation
• CPC Class Codes: A61B 17/7083 Tools for guidance or insertion of tethers, rod-to-anchor connectors, rod-to-rod connectors, or longitudinal elements
• CPC Class Codes: A61B 2017/0256 for the spine
• CPC Class Codes: Y10T 403/291 having tool-engaging means or operating handle

Abstract

A medical technical compression implant (1) for the surgical repair of damage to the spine, especially in the cervical region, includes two clamp jaws (3, 4), which are directed toward each other, are hook-shaped, are connected by a threaded spindle (2), and can be compressed while reducing the distance (B) between them. A wrench profile (9) for attaching a rotating tool in an interlocking manner is arranged at the threaded spindle (2) between two threaded sections (7, 8) with right-hand threads and left-hand threads, respectively. Both the clamp jaws (3, 4) have threaded nuts (5, 6), which are pivotably mounted from bodies, with diametrical threaded bores for screwing on the threaded sections (7, 8). The threaded nuts are mounted in cylindrical transverse bores of the clamp jaws (3, 4). The bore walls (21) are provided with diametrical openings (22, 23) for passing through the threaded sections (7, 8) of the threaded spindle (2). The threaded spindle (2) has, at both ends, an outwardly tapering cone (12, 13) each, which brings about pivoting of the clamp jaw (3, 4) around the axis of the transverse bore in the pulling direction, in cooperation with the inner edge or inner surface of the opening (22) designed as a radial bore.

A manipulating device in the form of a special expanding forceps is provided for implantation.

Claims

1. Medical technical compression implant for surgical repair of damage to the spine, comprising:

first and second vertebral clamp jaws, each with a hook-shaped portion sized to be applied over a vertebra and each with a cylindrical transverse bore;

first and second threaded nuts, each of said threaded nuts being pivotably mounted in said cylindrical transverse bore of one of said first and second jaws to each form a cylindrical rotary body, said threaded nuts each having a diametrical threaded bore, extending radially with respect to said cylindrical transverse bore;

a threaded spindle connecting said clamp jaws with hook-shaped portions facing each other, said threaded spindle having a wrench profile for attaching a rotating tool in an interlocking manner between a first threaded section and a second threaded section, said first threaded section having right hand threads and said second threaded section having left hand threads, said clamp jaws having walls surrounding said transverse bores with diametrical openings for passing through said threaded sections of said threaded spindle, said diametrical openings including an inner side opening formed as an elongated hole defining a pivot region for said threaded spindle.

2. Compression implant according to claim 1, wherein:

said threaded spindle passes through said elongated hole, and is screwed into said threaded nut, said elongated hole pivot region allowing said thread spindle, screwed into said nut, to pivot by at least 15°

around a central axis of said transverse bore.

3. Compression implant according to claim 2, wherein:

said diametrical openings include an outer side opening formed as a radial bore to said central axis of said transverse bore, said threaded spindle having at least one end, an outwardly tapering cone allowing pivoting of said clamp jaw, around said central axis of said transverse bore in a pulling direction, in cooperation with an inner edge of said outer opening formed as a radial bore.

4. Compression implant according to claim 2, wherein:

said two clamp jaws are formed of a substantially identical design with a claw provided with an approximately semicylindrical inner surface with a geometric axis of curvature extending at least approximately in parallel to said axis of said transverse bore.

5. Compression implant according to claim 4, wherein:

inner surfaces of said claws have grooves or tooth profiles extending in a circumferential direction.

6. Compression implant according to claim 4, wherein:

said claw has a trapezoidal cross-sectional profile.

7. Compression implant according to claim 4, wherein:

an inner surface of said claw has two different radii of curvature including a larger radius of curvature located on an inner side adjacent to said transverse bore.

8. Compression implant according to claim 3, wherein:

a semicircular end section of said inner opening, said end section being adjacent to said claw, extends coaxially with said outer opening designed as a radial bore.

9. Compression implant according to claim 2, wherein:

an axis of said inner opening forms a right angle with a rear side surface of said clamp jaw.