Joints and connections – Structurally installed in diverse art device
Patent
1995-05-10
1997-04-01
Kim, Harry C.
Joints and connections
Structurally installed in diverse art device
403334, 403331, 606 61, 606 73, F16B 704
Patent
active
056159650
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a device for interconnecting an elongate element and a support for said element which may also be elongate.
It is known that in general in mechanical construction it is desired in many fields (automobile, aeronautic, medical) to reduce the overall size of an assembly of this type while increasing its strength. For example, in the field of medical prostheses, the assembly of two parts is usually achieved by means of screws the heads of which project and consequently increase the overall size of the prosthesis resulting in considerable drawbacks for the patient.
Assemblies of dovetail type are also known but these cannot support a high assembly prestressing and do not resist large wrenching forces.
SUMMARY OF THE INVENTION
An object of the invention is therefore to provide a device for interconnecting an elongate element and a support for said element which supports a very high assembly prestressing and involves no deformation or fracture of the connection if the prestressing is increased in an exaggerated manner.
According to the invention, the connection device comprises a slide so profiled as to be capable of being slidably inserted in the support coaxially with the elongate element and in intimate contact therewith, and said slide comprises two lateral lips adapted to be cooperative with slide-clamping ramps provided in the support, the lips and the associated ramps being inclined relative to the axis of the elongate element and thereby achieving a self-clamping of each lip of the slide in the associated ramp of the support.
In one embodiment of the invention, the lateral lips of the slide are curved in the transverse direction and disposed in complementary channels of the support forming said inclined ramps.
According to another feature of the invention, the lateral lips of the slide have a rectilinear cross-sectional contour and are disposed in complementary grooves of the support forming said inclined ramps.
In a particular application, the invention provides a spinal osteosynthesis device wherein the elongate element is a rod which is smooth or has surface asperities and extends along a vertebral segment to be straightened, while its support is a screw or a hook having a U-shaped body in which a slide is slid for clamping the rod to its anchorage element constituted by the screw or hook.
Further features and advantages of the invention will be apparent from the following description with reference to the accompanying drawings which illustrate several embodiments of the invention by way of non-limitative examples.
BRIEF DESCRIPTION OF THE DRAWINGS
In the drawings:
FIG. 1 is a perspective view with parts cut away of a first embodiment of the connection device according to the invention.
FIG. 2 is a perspective and partly sectional view of a second embodiment of the device according to the invention.
FIG. 3 is a longitudinal half-elevational view and half-sectional view taken on line 3--3 of FIG. 2.
FIG. 4 is an end elevational view of a third embodiment of the connection device according to the invention.
FIG. 5 is an exploded perspective view of a fourth embodiment of the invention applied to the assembly of a pedicular screw and a rod having surface asperities of a spinal osteosynthesis device.
FIG. 6 is a perspective view with parts cut away of the assembly of the rod and screw shown in FIG. 5 by means of a slidable slide according to the invention.
FIG. 7 is a side elevational view of the slidable slide shown in FIGS. 5 and 6.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The device shown in FIG. 1 permits interconnecting an elongate element 1, such as a rod, and a support 2 for said element, the assembly of these two parts forming a cross-shaped structure. This device comprises a slide 3 which is so profiled as to be capable of being slidably inserted in the support coaxially with the elongate element 1 and in intimate contact with the latter.
For this purpose, there is formed in the support 2 a recess 4 on the bottom of which the e
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patent: 5380326 (1995-01-01), Lin
Bigand Dominique
Chevalier Jean-Louis
Saurat Jean
Kim Harry C.
Sofamor S.N.C.
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