Bone block fixation implant

• US 6,001,100 A
• Filed: 08/19/1997
• Issued: 12/14/1999
• Est. Priority Date: 08/19/1997
• Status: Expired due to Fees

• Current Assignee: Bionx Implants, Oy
• Original Assignee: Bionx Implants, Oy
• Inventors: Sherman, Mark, Tormala, Pertti, Kaikkonen, Auvo, Pohjonen, Timo
• Primary Examiner(s): Buiz, Michael
• Assistant Examiner(s): HO, TAN-UYEN THI
• Application Number:
  US08/914,137
• Time in Patent Office: 847 Days
• Field of Search: 606/72, 606/75, 606/73, 606/77, 606/76, 606/88, 606/86, 606/61, 623/13
• US Class Current: 606/232
• CPC Class Codes: A61F 2/0811 Fixation devices for tendons or ligaments
• CPC Class Codes: A61F 2002/0858 Fixation of tendon or ligament between anchor and bone, e.g. interference screws, wedges
• CPC Class Codes: A61F 2002/087 Anchor integrated into tendons, e.g. bone blocks, integrated rings
• CPC Class Codes: A61F 2002/0888 Anchor in or on a blind hole or on the bone surface without formation of a tunnel
• CPC Class Codes: A61F 2002/2835 Bone graft implants for filling a bony defect or an endoprosthesis cavity, e.g. by synthetic material or biological material
• CPC Class Codes: A61F 2002/30062 (bio)absorbable, biodegradable, bioerodable, (bio)resorbable, resorptive
• CPC Class Codes: A61F 2002/30841 Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
• CPC Class Codes: A61F 2210/0004 bioabsorbable

Abstract

In the present invention, a bioabsorbable implant is described, which implant is manufactured of bioabsorbable polymer, copolymer, polymer alloy or fiber reinforced and/or particle filled composite, which implant is pushed into a hole or drill canal made in a bone, for fixing a bone graft into the drillhole, wherein the implant comprises: (1) at least one elongated body, (2) at least one gripping element to lock the implant into the drillhole, and (3) a platform surface for location of a bone block between the implant and the wall of the drillhole. The implant also may be equipped with (4) an additional arresting means, which effectively prevents the slipping of the bone block out of the drillhole.

Claims

1. A surgical implant for fixing a bone block into a drillhole in a bone, said implant comprising:

at least one elongated body manufactured from bioabsorbable polymer, copolymer, polymer alloy or composite;

at least one gripping element on the elongated body, for locking the implant into the drillhole; and

a platform surface on the elongated body for receiving the bone block, wherein said elongated body, gripping element and platform surface are integrally attached, and said elongated body is capable of being pushed into the drillhole.

2. A surgical implant according to claim 1, further comprising an arresting means for preventing slipping of the bone block out of the drillhole.

3. A surgical implant according to claim 1, wherein said at least one gripping element comprises at least one protuberance.

4. A surgical implant according to claim 1, wherein said at least one gripping element comprises at least one thread.

5. A surgical implant according to claim 1, wherein said at least one gripping element comprises at least one transverse ridge.

6. A surgical implant according to claim 1, wherein said at least one gripping element comprises at least one barb.

7. A surgical implant according to claim 2, wherein said arresting means comprises at least one protuberance.

8. A surgical implant according to claim 2, wherein said arresting means comprises at least one barb.

9. A surgical implant according to claim 2, wherein said arresting means comprises at least one threshold.

10. A surgical implant according to claim 1, wherein said elongated body is cylindrical in form.

11. A surgical implant according to claim 1, wherein said elongated body is porous.

12. A surgical implant according to claim 1, wherein said implant is capable of releasing a drug or other bioactive substance.

13. A method of inserting the surgical implant of claim 1 and a bone block into a drillhole in a bone, comprising the steps of:

a. attaching the bone block to the elongated body;

b. pushing the bone block and elongated body into the drillhole; and

c. locking the implant into the drillhole by means of the gripping means on the implant.

14. A method of inserting the surgical implant of claim 1 and a bone block into a drillhole in a bone, comprising the steps of:

a. inserting the bone block into the drillhole;

b. pushing the elongated body into the drillhole;

c. locking the implant into the drillhole by means of the gripping means on the implant.

15. A method for securing a bone graft in an endosteal tunnel comprising:

drilling an endoseal bore of a size sufficient to form a space between the bone graft and a wall of the bore when the graft is inserted in the bore;

positioning the bone graft in the bore such that a space is formed between the graft and a wall of the bore;

selecting a biocompatible bioabsorbable fixation device comprising at least one elongated body manufactured from bioabsorbable polymer, copolymer, polymer alloy or composite, at least one gripping element on the elongated body, for locking the implant into the bore and a platform surface on the elongated body for receiving the bone block;

pushing the fixation device into the space between the bone graft and the wall of the bore so that the gripping element contacts the wall of the bore and the platform surface contacts the surface of the bone block and the device is located within the bore so that an interference fit, that resists withdrawal of the graft from the bore, is formed.