WO2004026160A1

WO2004026160A1 - Compression plate for osteosynsthesis

Info

Publication number: WO2004026160A1
Application number: PCT/TR2003/000076
Authority: WO
Inventors: Haci Kutlu
Original assignee: Haci Kutlu
Priority date: 2002-09-18
Filing date: 2003-09-15
Publication date: 2004-04-01
Also published as: TR200202204A2; AU2003267934A1

Abstract

It's used for internal fixation of the load bearing bones. It accelerates the bone knitting and ensures early mobilization. The bone contact surface of the plate has reverse saw-nails from the mid-line towards the ends, thus allows compression but not distraction. It also reduces the plate contact with the bone surface and allows periostal perfusion. Transfer of axial load to the bone fragments is ensured by enlarging the screw canals longitudinally. The screw applications may be adjusted to the desired compression and dynamization level (distance). The plate can be supported by cable grips through the cable canals or tunnels.

Description

COMPRESSION PLATE FOR OSTEOSYNSTHESIS

Fixation of the load bearing long bones have always been a challenge in orthopedics and traumatology. Those fractures were normally fixed by normal plates, DCP plates, intramedullary nails or external fixators. Delay in knitting of fractures, lack of knitting is possible by normal plates and thus time for mobilization may be more and quality of mobilization may be less than expected. Moreover, in current plates if the patient is mobilized with loading before the osteosentesis, then plates will carry the load, and plate fractures may occur. Therefore in current plates the patients are not allowed to full loading while walking time before the efficient osteosentesis.

Both distraction and compression are possible by dynamic plate. However compression cannot be done adequately and it can not be supported by cable grip. Similarly in intramedullary nails x-ray is usually needed and there is dangerous risk of panosteomyelitis.

HOLYPLATE (LFP) is used particularly for fixation of load carrying bones in orthopedics and traumatology. It accelerates knitting and early mobilization. The contact surface of the plate with the bone has saw-nails and in the reverse direction from midline to the end. Thus it allows compression but not distraction. It also reduces contact of the plate with bone surface and allows periostal perfusion. For the purpose the nails may be in different shapes. The section which overlaps with the bone at the fracture site in the middle may have no nails (OO'). Longitudinal canals can be made on the inferior surface to increase the lateral stability. Transfer of axial load to the bone fragments is ensured by enlarging the screw canals longitudinally. The screw may be adjusted to the desired compression level during the insertion. The same plate may be supported by cable grips through cable grip canals from the corners. Cable grip can be applied in case screw cannot be applied. Or combination of the screws and cable grips can be possible.

Description of the figures regarding the invention that are explanatory but not restrictive is below:

Figure I: Lateral view of LFP. The plate is left without nail because midline of the plate lines up with the fracture. The inferior surface of the plate has reverse saw nails from the middle towards the ends. Here direction of the saw-nails and cable grip hole and location can be seen from the lateral side.

Figure II: View of the plate from the top side. Cable insertion canals and screw beds can be seen. Figure III. View of the plate from the bottom side. Location of reverse saw- nails can be seen. Lateral stability can be ensured by canals carved along the plate longitudinally.

Figure IV. A cross-sectional view of the plate alongside the cable canal. It shows location of cable canal. Plate can be manufactured in various size and thickness. Plate can be formed in accordance with the main philosophy.

It's applied according to the same principles ruling the general plate applications, in operation room under sterile conditions. Screws are applied in the way that the interval of compression can be adjusted. In that case when the screws are applied in both sides to the remotest distance from the fracture, compression margin will be the maximum; when applied to the closest distance compression margin will be zero.

Follow up is carried out in line with general plate follow up rules.

Claims

1. A plate allowing the axial load transferring of the bone to bone in long bone fractures in orthopedics and traumatology; it allows for adjustment of dynamization, compression but not distraction, and also enhances periostal perfusion, and it can be supported by cable grip (steel or titanium cable) through tunnels or canals.

2. According to Claim 1 the plate should have the following characteristics: the contact surface with the bone has reverse saw-nail starting from the fracture zone towards both ends, and these reverse saw-nails may be in different shapes for the purpose (Figure l-lll), zone overlapping the fracture may be without nails (Figure II-

III: OO').

3. The plate in line with Claim 1 ensures stability by carving longitudinal canals over the bone contact surface from the sides (Figure III).

4. In line with Claim 1 the screw holes were carved as a longitudinal canal so that screws can move freely into the canals of the plate and thus the plate allows transferring axial load directly to the bone fragments (Figure II).