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Graft anchor
| Details |
Inventors: Graf, Ben K.; Ferragamo, Michael C.; Blough, Rebecca A.; Brown, Jr., Charles H.;
Assignee: Smith & Nephew, Inc. (Memphis, TN)
Primary Examiner: McDermott; Corrine
Assistant Examiner: Barrett; Thomas C.
Attorney, Agent or Firm: Fish & Richardson PC
A graft anchor includes an anchor member for placement in bone tissue. The anchor member defines an opening. An inner member is insertably securable into the anchor member opening. A fastener is configured such that insertion and securing of the inner member into the anchor member opening results in a holding force being applied to the graft. The anchor member is of limited length to maintain its distal end within the bone. The anchor member includes a distal drive opening for receiving a drive tool and the inner member includes a proximal drive opening for receiving the drive tool. The fastener includes channels for containing the graft, a fastener body with protrusions extending from the fastener body for penetrating bone tissue, and a reinforcing member contained within the fastener body. |
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DETAILED DESCRIPTION A graft anchor for securing a graft to bone includes an anchor member for placement in bone tissue.
The anchor member defines an opening.
An inner member is insertably securable into the anchor member opening.
A fastener is configured such that insertion and securing of the inner member into the anchor member opening results in a holding force being applied to the graft.
In particular embodiments of the invention, the anchor member is of limited length to maintain its distal end within the bone and the opening is a threaded axial bore.
The inner member includes external threads for mating with the axial bore threads and a smooth shank proximal of the external threads.
The anchor member includes external, threads; the threads are preferably self-tapping.
The axial bore of the anchor member includes a distal drive opening for receiving a drive tool, and the inner member includes a proximal drive opening for receiving a drive tool.
The distal and proximal drive openings are preferably hexagonally shaped.
The fastener includes a channel for containing the graft, a guide defining the channel, a fastener body with protrusions extending from the fastener body for penetrating bone tissue, and a reinforcing member contained within the fastener body.
The fastener body has a strength less than the reinforcing member.
The fastener includes a through bore and a lip surrounding the through bore which separates the graft from the through bore.
The fastener body has a generally circular shape which may include two flat sides.
According to another aspect of the invention, a method of securing a graft to bone includes the steps of placing an anchor member into the bone, positioning a fastener such that a portion of the graft lies between the fastener and the bone, inserting and securing an inner member into the anchor member, the insertion forcing the fastener into the bone to secure the graft by squeezing the graft between the fastener and the bone.
In particular embodiments of the invention, the method includes drilling a counterbore in the tunnel perpendicular to a central axis of the tunnel, and drilling a hole perpendicular to the central axis of the tunnel and centered within the counterbore
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Heart Surgery 
