Rod for cervical vertebra and connecting system thereof

• US 6,620,164 B2
• Filed: 09/20/2001
• Issued: 09/16/2003
• Est. Priority Date: 09/22/2000
• Status: Expired due to Fees

• Current Assignee: Showa Ika Kohgyo Co., Ltd.
• Original Assignee: Showa Ika Kohgyo Co., Ltd.
• Inventors: Oribe, Kazuya, Ueyama, Kazumasa, Sannohe, Akio, Echigoya, Naoki, Ina, Noriyuki
• Primary Examiner(s): Philogene, Pedro
• Application Number:
  US09/955,943
• Publication Number:
  US 20020042614A1
• Time in Patent Office: 726 Days
• Field of Search: 606/61, 606/60, 606/69, 606/72, 606/71, 606/73, 606/53, 606/86
• US Class Current: 606/261
• CPC Class Codes: A61B 17/7002 Longitudinal elements, e.g. rods
• CPC Class Codes: A61B 17/7011 Longitudinal element being non-straight, e.g. curved, angled or branched adjustable length longitudinal elements A61B17/7014; A61B17/7019 takes precedence, e.g. coil springs
• CPC Class Codes: A61B 17/7037 wherein pivoting is blocked when the rod is clamped
• CPC Class Codes: A61B 17/7038 to a different extent in different directions, e.g. within one plane only
• 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 17/7049 Connectors, not bearing on the vertebrae, for linking longitudinal elements together A61B17/7055, A61B17/7053, A61B17/7019 take precedence
• CPC Class Codes: A61B 17/7055 connected to sacrum, pelvis or skull
• CPC Class Codes: A61B 17/80 Cortical plates , i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates

Abstract

Connector connecting an implant to a bone connecting rod. The connector includes a first fastening member provided with an engagement hole freely engaging with a head portion of the implant anchored to the vertebral bodies and a fastening groove. A second fastening member is provided with an insertion hole freely inserting the rod therethrough and a fastening groove. A through hole penetrating in a direction crossing to the fastening groove in the first fastening member and a through hole penetrating in a direction crossing to the fastening groove in the second fastening member are provided with fastening devices.

Claims

1. A bone connecting system:

a rod portion mounted to a cervical vertebra;

a symmetrically-formed flat-shaped mounting portion provided in the rod portion and mounted to a cranium portion;

a plurality of mounting holes provided in the flat-shaped mounting portion;

a rod plate for a cervical vertebra in which the plurality of mounting holes are arranged in a symmetrical manner so as to be formed to be common between the right and left sides; and

an implant screwed and inserted to the rod plate and a body of vertebra, comprising;

a first fastening member having an engagement hole freely engaging with a head portion of the implant and a fastening groove; and

a second fastening member provided with an insertion hole freely inserting the rod portion therethrough and a fastening groove, wherein

a through hole penetrating in a direction crossing to the fastening groove in the first fastening member and a through hole penetrating in a direction crossing to the fastening groove in the second fastening member are provided fastening devices freely penetrating.

2. A bone connecting system according to claim 1, wherein

the fastening device is constituted by a bolt, and

a screw hole portion freely engaging with the bolt is formed in one end side of the through hole in the first fastening member or in one end side of the through hole in the second fastening member.

3. A bone connecting system according to claim 2, further comprising a first tool engagement portion in which an outer peripheral surface of a head portion in the bolt is formed in a polygonal shape.

4. A bone connecting system according to claim 3, wherein a second tool engagement portion is further provided in a top surface of the head portion in the bolt.

5. A bone connecting system according to claim 1, wherein the mounting portion is formed in a flat-shaped substantially fan shape, and the mounting portion is inclined with respect to the rod portion.

6. A bone connecting system according to claim 1, wherein a plurality of an angle adjusting and engaging portions are provided in a circular arc direction around a through hole of the first fastening member or the second fastening member, on a connecting surface between the first fastening member and the second fastening member.

7. A bone connecting system according to claim 1, wherein the implant screwed and inserted to the vertebral bone comprises:

a screw portion;

a cylindrical portion provided in a head portion of the screw portion; and

a polygonal tool engagement portion provided in a head portion of the cylindrical portion.