CS244866B1 - Seat for positioning of hip joint shallow - Google Patents

Abstract

The solution relates to a hip bed hollow hemispherical hollows (4). On the inside of the joint cavity (4) is a recess for an artificial head of the femur and on its outside are optionally, fitting members are formed articular holes / 4 /. The bed is a system / 1 / elastic elements that are on the inside side created to store articulation / 4 / and adapted to the outside to store the bed in the acetabulum bottom. The bed is provided with an opening in the central part (5) for the passage of the fixing bolt positioned at the top of the outer side of the joint cavity (4). This is a hip bed articular holes are useful in orthopedic and traumatological operations.

Description

Author of the invention PAVLÁNSKÝ RUDOLF prof. MUDr., 'PETRTÝL MIROSLAV Assoc. CSc. '

VALENTA JAROSLAV Assoc. Ing. member correspondent CSAV, ’

SLAVIK MIROSLAV prof. MUDr. CSc., PRAGUE (54) Bed for storing the hip joint cup

The present invention relates to a hollow hemisphere-like receptacle (4). On the inner side of the articular cup (4) there is a recess for the artificial head of the femur, and on its outer side there are optionally formed contact elements for fixation of the articular cup (4). The bed is constituted by a set of resilient elements (1) which are formed on the inner side for receiving the articulation well (4) and on the outer side adapted to accommodate the bed in the bottom of the acetabulum.

The bed is provided in the central part with an opening (5) for the passage of a fixing gag located at the top of the outer side of the joint cup (4).

This modified bed for the placement of the hip joint cup can be used in orthopedic and traumatological operations.

244866 2

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hinge for receiving a hip joint cup having the shape of a hollow hemisphere.

Hitherto, the hip joints have been fixed to the bone by means of anchoring elements formed on the hip joint body, such as stabilizing projections, radial wings, helix, screws and other connecting parts.

In addition, a protrusion bead is provided for attachment to the bone, which is elongated in the distal direction in the shape of a distal abutment and is provided at its upper end with a pole rounded protrusion and a surface or holes for scar fixation of the implant in acetabulum.

These solutions do not provide a firm fixation and do not allow the force effects to be spread over a large stress field. Also, the center of the artificial head of the prosthesis of the well is usually medialized and shifted proximally.

Said drawbacks are eliminated by a hollow hemisphere-like seat for the hip joint, on the inside of which there is a recess for the artificial femoral head, and on the outside of which there are optionally joint members for fixing the joint, according to the invention.

Its essence consists of a system of resilient elements, such as rods and splints, which are arranged on the inner side to accommodate the joint cup and are shaped on the outer side in the form of a bed arranged on the bottom of the acetabulum. The seat may advantageously be provided in the central part with an opening for the passage of the fixing gag located at the top of the outer side of the joint cup. ;

When using the bed according to the invention, bone cement is not required, fixation and stability are due to a large bone-to-bone contact surface, possibly secured by bone grafts embedded in the implant cavity in the wake of the hip bone.

The use of the described bed also saves the bone base of the acetabulum, thereby not reducing the load-bearing capacity of the bone. Furthermore, the proposed artificial implant ensures the anatomically correct positioning of its joint joint surface with respect to the axis of the neck of the endoprosthesis - head - well and the center of rotation of the head is not medialized.

The type of bed according to the invention does not require medialization which, in commonly used arch wells, requires the removal of not only cartilage but also bone. The implant permits the use of components, i.e., the well and the head, of larger dimensions than the conventional type of joint wells permit.

This ensures better slip of the components and reduces the amount of contact pressure in the joint between the implant head and the well. Furthermore, the quantity of abrasive particles, which tend to cause reactive osteoporosis with the implant loosening and the enlargement of the contact areas, increases the life of the implant.

The invention and its effects are explained in more detail in the description of an exemplary embodiment thereof according to the accompanying drawing, in which Fig. 1 'shows the incorporation of the bed according to the invention into the hip region,

Giant. Fig. 2 shows the bed according to the invention in a view from the bone side; and Fig. 3 shows in section the bed according to the invention including the respective hip joint cup.

The bed is made as a set of 2 elastic elements, preferably bars, abutting the entire base of the acetabulum at the front of the prepared furrow 2 in the hip bone. On the outer side of the stack 2 of resilient members is formed by means of resilient rods loading bulge 2 P ^ro own acetabulum 2 ·

The rods may be metal, plastic, bioceramics or combinations thereof, composite materials or materials of similar properties. In the hollow of the bed 2, there is the actual joint well 2 ^{3 of the} central guide gag, which is inserted through the opening 2 ^{in the} central part of the bed into the opening in the bone at the bottom of the acetabulum in the selected direction. This proprietary joint well 4i is made of metal, plastic, bioceramics or other materials of similar properties and combinations thereof. This articulation well 14 can be inserted or firmly fixed in the hollow cavity 2.

The fixation ^{of the} elastic element assembly 2 to the bone can be increased by one or more mechanical elements such as spikes, nails, screws and dowels.

This modified bed for the placement of the hip joint cup can be used in orthopedic and traumatological operations.

OBJECT OF THE INVENTION

Claims (2)

There is a recess for the artificial head of the femur, and on its outer side there are optionally formed joint members for the fixation of the joint cup, characterized in that it consists of a system (1) of elastic elements such as rods and splints. the articular wells (4) and on the outside are shaped as a bed arranged on the bottom of the acetabulum. A bed according to claim 1, characterized in that it has a central opening (5) for the passage of a fixing bolt located on the top of the outer side of the joint cup. 1 drawing FIG