Holding and fixing mechanism for orthopedic surgery

• US 5,507,746 A
• Filed: 07/27/1994
• Issued: 04/16/1996
• Est. Priority Date: 07/27/1994
• Status: Expired due to Fees

• Current Assignee: Lin, Chih-I
• Original Assignee: Lin, Chih-I
• Inventors: Lin, Chih-I
• Primary Examiner(s): Pellegrino, Stephen C.
• Assistant Examiner(s): MARKOW, SCOTT
• Application Number:
  US08/280,659
• Time in Patent Office: 629 Days
• Field of Search: 606/61, 606/60, 606/73, 403/400, 403/395
• US Class Current: 606/264
• 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: Y10T 403/7194 Crossed rods

Abstract

A holding and fixing mechanism for an orthopedic surgery makes use of a holding plug to fasten together a U-shaped clamping block, a wedging element and a rod body. The clamping block is provided with two through holes capable of cooperating with a wedging portion of the wedging element and the holding plug so as to form an appropriate angle as required between the wedging element and the U-shaped clamping block. The fixation position of the wedging element can be easily adjusted. The holding and fixing mechanism is attained by the knurl-fastening method in place of the conventional screw-fastening method.

Claims

1. A holding and fixing mechanism for an orthopedic surgery comprising:

a substantially curved U-shaped clamping block including a left plate and a right plate, which are each provided correspondingly and respectively with a through hole;

a wedging element having one end serving as a fastening element for fastening onto one of a vertebra and a vertebral fixation device, said wedging element further having another end serving as a wedging portion provided thereon with knurls, the wedging portion of said wedging element extending through the through hole provided in each of said left plate and said right plate of said U-shaped clamping block;

a rod body located between said U-shaped clamping block and said wedging element; and

a holding plug lodged securely between said wedging portion of said wedging element and said rod body, said holding plug provided in one side thereof with a holding groove defining a columnar holding hole for holding therein securely said rod body, in conjunction with a curved portion of said U-shaped clamping block;

wherein a line extending through the through holes provided in said left plate and said right plate of said U-shaped clamping block forms a specific angle with an axis defined by the wedging portion of said wedging element, said specific angle ranging between 5° and

15°

.

2. The holding and fixing mechanism of claim 1 wherein said holding grooves of said holding plug and said curved portion of said U-shaped clamping block form a hollow cavity in which said columnar holding hole is arranged and said rod body is held securely.

3. The holding a fixing mechanism of claim 2 wherein said wedging element comprises a vertebral auxiliary fixation rod.

4. The holding and fixing mechanism of claim 2 wherein said holding plug incorporates means for preventing said holding plug from being detached.

5. The holding and fixing mechanism of claim 4 wherein said wedging element comprises a bone screw.

6. The holding and fixing mechanism of claim 5 wherein said rod body constitutes a vertebral fixation rod.

7. The holding and fixing mechanism of claim 4 wherein said rod body constitutes a vertebral fixation rod.

8. The holding and fixing mechanism of claim 2 wherein said wedging element comprises a bone screw.

9. The holding and fixing mechanism of claim 8 wherein said rod body constitutes a vertebral fixation rod.

10. The holding an fixing mechanism of claim 2 wherein said rod body constitutes a vertebral fixation rod.

11. The holding and fixing mechanism of claim 1 wherein the curved portion of said U-shaped clamping block is provided with a bevel for receiving said holding plug;

and wherein the knurls of said wedging portion is engageable with knurls provided on said holding plug.

12. A holding and fixing mechanism for an orthopedic surgery comprising:

a substantially curved U-shaped clamping block including a left plate and a right plate, which are provided correspondingly and respectively with a through hole;

a wedging element having one end serving as a fastening element for fastening onto one of vertebra and a vertebral fixation device, said wedging element further having another end serving as a wedging portion provided thereon with parallel grooves, the wedging portion of said wedging element extending through the through hole provided in each of said left plate and said right plate of said U-shaped clamping block;

a rod body located between said U-shaped clamping block and said wedging element; and

a holding plug lodged securely between a curved portion of said U-shaped clamping block and said rod body, said holding plug provided in one side thereof with a holding groove defining a columnar holding hole for holding therein securely said rod body, in conjunction with said parallel grooves of said wedging portion of said wedging element;

wherein a line extending through the through holes provided in said left plate and said right plate of said U-shaped clamping block forms a specific angle with an axis defined by the wedging portion of said wedging element, said specific angle ranging between 5° and

15°

.

13. The holding and fixing mechanism of claim 12 wherein said holding grooves of said holding plug and said knurls of said wedging portion of the wedging element form a hollow cavity for holding securely said rod body.

14. The holding and fixing mechanism of claim 13 wherein said holding plug incorporates a retaining means for preventing said holding plug from becoming detached.

15. The holding and fixing mechanism of claim 13 wherein said wedging element comprises a bone hook.

16. The holding and fixing mechanism of claim 15 wherein said rod body constitutes a vertebral fixation rod.

17. The holding and fixing mechanism of claim 13 wherein said rod body constitutes a vertebral fixation rod.