Device for osteosynthesis

• US 4,957,497 A
• Filed: 07/13/1989
• Issued: 09/18/1990
• Est. Priority Date: 10/27/1984
• Status: Expired due to Fees

• Current Assignee: Hans E. Harder, Klaus Behrens, Thomas Hoogland
• Original Assignee: Hans E. Harder, Klaus Behrens, Thomas Hoogland
• Inventors: Hoogland, Thomas, Harder, Hans E., Behrens, Klaus
• Primary Examiner(s): Isabella, David J.
• Application Number:
  US07/380,701
• Time in Patent Office: 432 Days
• Field of Search: 128/92 Y, 128/92 YP, 128/92 PM, 128/92 YF, 128/92 X, 606/60, 606/69-72
• US Class Current: 606/71
• 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
• CPC Class Codes: A61B 17/8004 with means for distracting or compressing the bone or bones
• CPC Class Codes: A61B 17/8023 Variable length plates adjustable in both directions

Abstract

A device for osteosynthesis comprises an elongated bone plate and an elongated slide plate adapted to be fitted on the outside of the bone plate. Several longitudinally spaced elongated holes for the reception of bone screws are provided in one longitudinally portion only of the bone plate, while the other longitudinal portion of the bone plate is provided with circular holes and the elongated slide plate is provided with several longitudinally spaced circular holes. The circular holes in the slide plate have a diameter approximately equal to the width of the elongated holes in the bone plate and a pitch substantially equal to the pitch of those elongated holes.

Claims

1. A device for osteosynthesis comprising:

(a) an elongated bone plate having first and second longitudinal portions and having a bottom surface and an upper surface, said bottom surface being adapted to rest upon the patient'"'"'s bone, said upper surface being oppositely disposed with respect to said bottom surface, with a plurality of elongated holes disposed in a longitudinally spaced arrangement for the reception of bone screws being provided in said second longitudinal portion of said bone plate, and a plurality of circular holes for the reception of bone screws being provided in said first longitudinal portion, and said first longitudinal portion being adapted to be screwed into the patient'"'"'s bone on a first side of a fracture, and said second longitudinal portion being adapted to be screwed into the patient'"'"'s bone on a second side of the fracture, and

(b) an elongated plate having an upper surface and a bottom surface which is adapted to be fitted on and slidable with respect to the upper surface of, and only on said second longitudinal portion of, said bone plate and provided with a plurality of longitudinally spaced circular holes each having a center and having a diameter approximately equal to the width of said elongated holes and a separation between two adjacent centers being substantially equal to the separation between the centers of two adjacent elongated holes, wherein said slide plate is curved in its transverse cross-section with the concave side of the slide plate being adapted to lie in close contact against said bone plate when the slide plate is fitted on the bone plate, wherein said bone plate defines a longitudinally extending channel having a channel bottom and opening towards the upper surface of the bone plate, with said elongated holes being located on said channel bottom and said slide plate being received and guided within said channel when the slide plate is fitted on the bone plate, wherein said bone plate has an approximately U-shaped transverse cross-section with the shape of said U-shaped transverse cross-section being formed from legs having a height h, and wherein said bone plate has an upper surface exhibiting a tapered profile in the longitudinal direction with said height h of said legs of said U-shaped cross-section steadily decreasing from the center of said bone plate to the ends of said bone plate.

2. A device for osteosynthesis comprising:

(a) an elongated bone plate having first and second longitudinal portions and having bottom and upper surfaces, said bottom surface being adapted to rest upon the patient'"'"'s bone, said upper surface being oppositely disposed with respect to said bottom surface, with a plurality of elongated holes disposed in a longitudinally spaced arrangement for the reception of bone screws being provided only in said longitudinal portion of said bone plate, and a plurality of circular holes for the reception of bone screws being provided in said first longitudinal portion, and

(b) an elongated slide plate having an upper surface and a bottom surface which is to be fitted on the upper surface of said bone plate and provided with a plurality of longitudinally spaced circular holes each having a center and having a diameter approximately equal to the width of said elongated holes and a separation between two adjacent centers being substantially equal to the separation between the centers of two adjacent elongated holes, wherein said slide plate is curved in its transverse cross-section with the concave side of the slide plate adapted to lie in close contact against said bone plate when the slide plate is fitted on the bone plate, wherein said bone plate defines a longitudinally extending channel having a channel bottom and opening towards the upper surface of the bone plate, with said elongated holes being located at said channel bottom and said slide plate being received and guided within said channel when the slide plate is fitted on the bone plate, wherein said bone plate is approximately U-shaped in its transverse cross-section, wherein the U-shape is formed from legs having a height h and wherein said bone plate has an upper surface exhibiting a tapered profile in the longitudinal direction wherein said height h of said legs of said U-shaped cross-section steadily decreases from the center of said bone plate to the ends of said bone plate.