Orbital repair implant

• US 5,139,497 A
• Filed: 11/25/1991
• Issued: 08/18/1992
• Est. Priority Date: 11/25/1991
• Status: Expired due to Term

• Current Assignee: Sofamor Danek Properties, Inc. (Medtronic Plc)
• Original Assignee: TiMesh, Inc. (Medtronic Plc)
• Inventors: Tilghman, Donald M., Morgan, Frank H.
• Primary Examiner(s): Frinks, Ronald
• Application Number:
  US07/797,372
• Time in Patent Office: 267 Days
• Field of Search: 606/60, 606/61, 606/69-71, 623/16, 623/18, 623/21-23
• US Class Current: 606/285
• CPC Class Codes: A61B 17/8085 with pliable or malleable elements or having a mesh-like structure, e.g. small strips A61B17/8071, A61B17/8076 take precedence
• CPC Class Codes: A61B 17/86 Pins or screws or threaded wires; nuts therefor A61B17/72 take precedence
• CPC Class Codes: A61F 2/2875 Skull or cranium A61F2/2803 and A61F2/3099 take precedence
• CPC Class Codes: A61F 2/30767 Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
• CPC Class Codes: A61F 2002/2878 for orbital repair
• CPC Class Codes: A61F 2002/30578 having apertures, e.g. for receiving fixation screws
• CPC Class Codes: A61F 2002/30594 slotted, e.g. radial or meridian slot ending in a polar aperture, non-polar slots, horizontal or arcuate slots
• CPC Class Codes: A61F 2002/30708 Means for distinguishing between left-sided and right-sided devices, Sets comprising both left-sided and right-sided prosthetic parts
• CPC Class Codes: A61F 2002/30784 Plurality of holes
• CPC Class Codes: A61F 2002/30785 parallel
• CPC Class Codes: A61F 2002/3096 trimmed or cut to a customised size
• CPC Class Codes: A61F 2250/0084 Means for distinguishing between left-sided and right-sided devices; Sets comprising both left-sided and right-sided prosthetic parts
• CPC Class Codes: A61F 2310/00017 Iron- or Fe-based alloys, e.g. stainless steel
• CPC Class Codes: A61F 2310/00023 Titanium or titanium-based alloys, e.g. Ti-Ni alloys
• CPC Class Codes: A61F 2310/00029 Cobalt-based alloys, e.g. Co-Cr alloys or Vitallium

Abstract

A biocompatible and pliable metallic surgical implant plate for use in the repair and rigid fixation of internal fractures of the floor and walls of the orbit. The implant plate includes an elongated base portion which is compliant for shaping to interface with the rim structure of the orbit. Three perforated leaf portions, spaced from one-another, project rearwardly from the elongated base portion. The central leaf portion is compliant for shaping to conform to the configuration of the orbit floor, one of the outboard leaf portions is compliant for shaping to conform to the medial wall of the orbit and the other outboard leaf portion is compliant for shaping to conform to the lateral wall of the orbit.

Attachment legs, including screw holes, project forwardly from the elongated base portion of the implant plate and are compliant for shaping and fitment to the anterior face of the rim structure of the orbit with the implant plate being affixed to the rim structure of the orbit by bone screws applied through the screw holes of the attachment legs. Alternatively, an orbital rim reinforcing bar, including screw holes, may be attached to the elongated base portion of the implant plate by a series of legs. The leaf portions of the implant plate may be provided with a thin coating of biocompatible synthetic sheathing material to inhibit the ingrowth of hard and soft tissue into the perforation of the leaf portions.

Claims

1. A biocompatible and pliable metallic surgical implant plate for use in the repair of congenital and acquired defects and the rigid fixation of internal fractures and other defects of the floor and walls of the orbit comprising:

a) an elongated base portion of said implant plate being compliant for shaping to interface with the rim structure of the orbit floor and the rim structure of the medial and lateral walls of the orbit;

b) three perforated leaf portions of said implant plate projecting rearwardly from the elongated base portion thereof, said leaf portions being spaced from one-another, the central leaf portion being compliant for shaping to conform to the configuration of the orbit floor, one of the outboard leaf portions being compliant for shaping to conform to the medial wall of the orbit and the other of said outboard leaf portions being compliant for shaping to conform to the lateral wall of the orbit; and

c) attachment means for said implant plate projecting forwardly from the elongated base portion thereof and being compliant for shaping and fitment to the anterior face of the rim structure of the orbit, said attachment means including screw holes through which may be applied bone screws threaded into the rim structure of the orbit for fixation of said implant plate therein.

2. A biocompatible and pliable metallic surgical implant plate for use in the repair of congenital and acquired defects and the rigid fixation of internal fractures and other defects of the floor and walls of the orbit as claimed in claim 1 wherein the leaf portions of said implant plate each include a central open mesh area providing the perforations of said portions.

3. A biocompatible and pliable metallic surgical implant plate for use in the repair of congenital and acquired defects and the rigid fixation of internal fractures and other defects of the floor and walls of the orbit as claimed in claim 2 wherein the leaf portions of said implant plate each include a peripheral margin area surrounding said central mesh area providing a leaf surface area for trimming to final dimension and configuration for fitment to the orbit.

4. A biocompatible and pliable metallic surgical implant plate for use in the repair of congenital and acquired defects and the rigid fixation of internal fractures and other defects of the floor and walls of the orbit as claimed in claim 1 wherein the outboard leaf portion of said implant plate shaped to conform to the medial wall of the orbit includes a notch whereby said leaf upon placement in the orbit clears the medial canthal ligament and lacrimal apparatus of the orbit and the peripheral area of said leaf surrounding said notch includes holes for receiving sutures for securing the medial canthal ligament to said implant plate.

5. A biocompatible and piable metallic surgical implant plate for use in the repair of congenital and acquired defects and the rigid fixation of internal fractures and other defects of the floor and walls of the orbit as claimed in claim 1 wherein the outboard leaf portion of said implant plate shaped to conform to the lateral wall of the orbit includes holes for receiving sutures for securing the lateral canthal ligament and muscle forms associated with the lateral wall of the orbit to said implant plate.

6. A biocompatible and pliable metallic surgical implant plate for use in the repair of congenital and acquired defects and the rigid fixation of internal fractures and other defects of the floor and walls of the orbit as claimed in claim 1 wherein the elongated base portion and the perforated leaf portions of said implant plate are provided with a thin coating of biocompatible and sterilizable synthetic sheathing material to inhibit the ingrowth of hard and soft tissue into the perforation of the leaf portions of said implant whereby said implant plate may be removed from its placement position in the orbit.

7. A biocompatible and pliable metallic surgical implant plate for use in the repair of congenital and acquired defects and the rigid fixation of internal fractures and other defects of the floor and walls of the orbit as claimed in claim 6 wherein said sheathing material is selected from the group of biocompatible materials consisting of silicone rubber and compliant urethane compounds.

8. A biocompatible and pliable metallic surgical implant plate for use in the repair of congenital and acquired defects and the rigid fixation of internal fractures and other defects of the floor and walls of the orbit as claimed in claim 1 wherein the attachment means for said implant plate comprises a series of attachment tabs projecting forwardly from the elongated base portion of said implant plate and spaced along said base portion, each of said tabs terminating in a screw ring providing a screw hole through which may be applied a bone screw for threading into the rim of the orbit and surrounding bone.

9. A biocompatible and pliable metallic surgical implant plate for use in the repair of congenital and acquired defects and the rigid fixation of internal fractures and other defects of the floor and walls of the orbit as claimed in claim 1 wherein the attachment means for said implant plate comprises an orbital rim reinforcing bar attached to and spaced from the elongated base portion of said implant plate by a series of legs spaced along said base portion, said reinforcing bar including a series of screw holes through which may be applied bone screws for threading into the rim of the orbit.

10. A biocompatible and pliable metallic surgical implant plate for use in the repair of congenital and acquired defects and the rigid fixation of internal fractures and other defects of the floor and walls of the orbit as claimed in claim 1 wherein said plate, including its base portion, leaf portions and attachment means, is fabricated of a metal or metallic alloy selected from the group consisting of titanium, titanium alloys, cobalt-chrome alloys and stainless steel.