Surgery – Instruments – Orthopedic instrumentation
Patent
1996-04-15
1998-02-03
Buiz, Michael
Surgery
Instruments
Orthopedic instrumentation
606 64, 606 76, 606151, A61B 1756
Patent
active
057139016
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to reticulated orthopaedic elements to exploit the medullary canal of the long bones.
More particularly, the invention concerns an element of the above mentioned kind, totally or partially reticulate, that, in order to be applied and transversely blocked, allows to operate without employing ray apparatuses.
As it is well known, every bone is modelled, as far as shape and mass are concerned, to satisfy to the particular mechanical necessity for the specific situation in the skeleton.
At the skeleton functional level, the bones satisfy the static and locomotion necessity. With respect to the shape, bones are divided into categories, e.g. long bones, bones having a mainly cylindrical extension with respect to the diameter, flat bones and short bones.
The long bones have an extended body, called diaphysis, and have two terminal ends, more or less broadened, called epiphysis. The long bones at the diaphysial level, if seen along a sagittal section, or by a radiographic examination, have a long and large lumen called medullary canal, surrounded by an osseous compact casing. At the epiphysial level the long bone has spongy osseous zones.
Objects of the present invention include that of finding a new application technique for the reparation and rehabilitation of traumas of long bones and of articulations, exploiting the medullary canal as bearing and support either of the prosthetic manufacture for the reparation and of the arthro-prosthetic manufacture.
2. Description of the Prior Art
At present, the orthopaedic prostheses can be classified as a) endoprostheses, arthro-prostheses (hip joint, knee, elbow, humero-shoulder prostheses, etc.): where to replace one or both of the articulation heads is replaced with a metal prosthesis; b) revision endoprostheses arthro-prostheses (hip joint, knee, elbow, humero-shoulder prostheses, etc.): wherein the second or subsequent intervention after the failure of the preceding prosthesis, only one or both of the articulation heads is replaced with a metal prosthesis.
There are also the trauma prostheses for long bones used to obtain the endomedullary osteosynthesis.
In the prostheses for the articulations, the prosthetic stem is introduced by friction within the lumen of the medullary canal to obtain a immediate primary stability.
Often, lacking this primary stability, an "orthopaedic cement" is used in order to compensate the lacking of precision in the coupling between the prosthetic stem and the medullary lumen: in this way an immediate stability is obtained, but afterwards great problems for the osseous resorption are present: in some cases even the loss of the prosthetic manufacture can occur.
The osteosynthesis technique provides the union of two or more fractured bone segments by metallic parts.
An endomedullary nail is defined as the osteosynthesis element exploiting the endomedullary lumen of the long bones. It is indicated as a locked nail, an endomedullary nail crossed by transverse or diagonal screws in correspondence of its distal and proximal ends.
EP-A-0268115 describes an element for osteosynthesis made up of a reticulate of titanium or other biocompatible material.
At present, all the endomedullary nail requires for the distal locking is the use of the image intensifier and/or other apparatuses irradiating ionizing rays during their application.
The main drawback that the present invention aims to solve is that of avoiding the necessity of using the above apparatuses to transversely introduce and lock the abovementioned implants.
SUMMARY OF THE INVENTION
Particularly, the innovative solution according to the invention consists in the exploitation of the bearing and the support of the arthro-prosthesis, of the revision arthro-prosthesis or of the endomedullary nail, of the endomedullary lumen by a reticulate metallic structure made up by titanium or another biocompatible material that assumes the shape and the total or partial length of the medullary lumen.
The tubular reticul
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Buiz Michael
Woo Julian W.
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