Offset bone bolt

• US 5,545,228 A
• Filed: 02/11/1993
• Issued: 08/13/1996
• Est. Priority Date: 08/15/1991
• Status: Expired due to Term

• Current Assignee: Altiva Corp. (Exactech, Inc.)
• Original Assignee: Smith & Nephew Richards Incorporated (Smith & Nephew PLC)
• Inventors: Kambin, Parviz
• Primary Examiner(s): Willse, David H.
• Assistant Examiner(s): SNOW, BRUCE EDWARD
• Application Number:
  US08/016,681
• Time in Patent Office: 1,279 Days
• Field of Search: 606/60, 606/61, 606/71, 606/73, 623/13, 623/17, 433/174
• US Class Current: 606/60
• CPC Class Codes: A61B 17/7007 Parts of the longitudinal elements, e.g. their ends, being specially adapted to fit around the screw or hook heads
• CPC Class Codes: A61B 17/701 Longitudinal elements with a non-circular, e.g. rectangular, cross-section A61B17/7005, A61B17/7007 take precedence
• CPC Class Codes: A61B 17/7041 with single longitudinal rod offset laterally from single row of screws or hooks A61B17/7044 takes precedence
• CPC Class Codes: A61B 17/86 Pins or screws or threaded wires; nuts therefor A61B17/72 take precedence
• CPC Class Codes: A61B 50/30 Containers specially adapted for packaging, protecting, dispensing, collecting or disposing of surgical or diagnostic appliances or instruments for wound clamps A61B17/10; for ligaturing clips A61B17/122; packages or dispensers for surgical gloves or finger-stalls A61B42/40
• CPC Class Codes: Y10S 606/914 Toolkit for installing or removing spinal positioner or stabilizer
• CPC Class Codes: Y10S 606/916 Tool for installing or removing orthopedic fastener

Abstract

A method for percutaneous fixation of a pair of vertebrae of a patient, which comprises posterolaterally entering the back of a patient percutaneously with a plurality of offset bone bolts, screwing each bone bolt into the medullary canal of the pedicles of adjacent thoracic and/or lumbar vertebrae or the pedicles of the L5 and S1 vertebrae, to a position where the proximal end thereof lies adjacent the fascia of the patient; inserting bone bolt linkages under the skin of the back of the patient and detachably securing the linkage means to the proximal ends of the bolts on the same side of the spinous processes of the vertebrae to restrict relative movement between the vertebrae. A kit is provided for percutaneous fixation of vertebrae of a patient, comprising a plurality of offset bone bolts of different sizes, yet of a size to enable the distal end of each bolt to be screwed into the medullary canal of a pedicle of a vertebra with the proximal end thereof lying adjacent the fascia of a patient.

Claims

1. A bone bolt for internal fixation of bones through the use of a spinal fixation system comprising:

a) a lower threaded shank portion generally cylindrical in shape having bone threads configured to be surgically implanted into a patient'"'"'s bone, said lower portion having a central longitudinal axis;

b) a middle non-threaded portion monolithic with said lower threaded shank portion having a load transfer surface that includes an offset portion radially extending from the lower portion, the offset portion allowing for adjustability in the alignment of the implanted bone bolt in relation to other component parts of a spinal fixation system;

c) an upper threaded shank portion generally cylindrical in shape monolithic with the middle portion and having a second longitudinal axis spaced laterally away from the first longitudinal axis at the load transfer surface; and

d) the upper shank portion having cooperating means configured to cooperate with a clamping means and means for engagement with a driver means.

2. The bone bolt according to claim 1, wherein an aperture extends along the central longitudinal axis of the lower portion for cooperating with a guide wire.

3. The bone bolt according to claim 1, further including a bone plate member with fine adjustment means, engagement means interfacing the plate and the bone bolt, and locking means for cooperating with the proximal end portion of the bone bolt and locking the engagement means and plate on the bone bolt.

5. The bone bolt according to claim 1, wherein the cooperating means comprises threads for threadably receiving a nut.

6. The bone bolt according to claim 1, wherein the means for engagement comprises a hexagonal opening for cooperating with an allen wrench.

7. The bone bolt according to claim 1, wherein an aperture extends along the longitudinal axis of the distal end for cooperating with a guide wire.

4. A bone bolt for internal fixation of bones through the use of a spinal fixation system comprising:

a) an monolithic bolt member that comprises;

i) a distal threaded shank portion having bone screw threads thereon and configured to be surgically implanted into a patient'"'"'s bone, said distal shank portion having a first longitudinal axis;

ii) the threaded shank portion being monolithically connected to a middle non-threaded portion having a load transfer surface that includes a radially extending offset portion axially offset from the distal shank portion, said offset portion allowing for adjustability in the alignment of the implanted bone bolt in relation to other component parts of a spinal fixation system, said middle portion having an inner end that is monolithic with distal shank portion;

iii) a proximal threaded shank portion that is monolithic with the middle portion and having a second longitudinal axis spaced away from the first longitudinal axis at the load transfer surface; and

b) wherein the proximal threaded shank includes cooperating means configured to cooperate with a clamping means and means for engagement with a driver means.