Technical Field

The present invention relates to a prosthesis which is generally used in orthopedic wrist operations, is attached to the wrist of the patients whose wrist joint does not perform its task and performs the task of the natural wrist joint in a more efficient manner. The invention is an orthopedic product which can be used for the reconstruction of the defects that occur due to distal radius and/or any reason in the carpal bones .

The invention particularly relates to an orthopedic prosthesis in the medical field which is designed for eliminating the painful joint deformations caused by osteoarthritis, rheumatoid arthritis, traumatic arthritis, tumor, fracture etc .

Prior Art

A severe pain occurs in the relevant area due to the damage on the joint surface and the person becomes nonfunctional to meet his/her daily requirements. The prosthesis applications made specific to the symptoms experienced by the patient can eliminate these difficulties. The prostheses are artificial products which can be used instead of any organ or tissue which are absent in the body. The prosthesis in orthopedic applications is generally described as an implant which is located into the bone or on the surface of the same by surgery in order to replace a diseased joint or a joint that lost its integrity . In the state of the art, various prostheses are used in order to eliminate the damage in large bone defects that occur in wrist, in the tumoral or traumatic, degenerative applications. In the applications known in the art, there is no such a prosthesis which can be used tumoral or traumatic, degenerative at once .

In the current art, monoblock application of the radial stem negatively affects the use of the prosthesis in the revision and tumoral applications.

In the state of the art, there are no suture holes on the anatomical radial component dorsal surface. The suture holes, especially in traumatic situations, assist to eliminate the risk of bone tissue remaining on the prosthesis or occurrence of adhesions between the prosthesis and the tendon.

In the current art, the appearance of the wrist is negatively affected after the prosthetic operation due to the failure to restore the distal radioulnar joint.

In the current art, the risk of early loosening of the carpal component in the rotational (rotation) movements occurs based on not using a lock screw for fixing the carpal component.

In the current art, the connection of the radial shaft and the radial metaphyseal is enabled with the screw system in the modular systems. The screw system leads to a reduction in the stem diameter, affects the resistance of the stem negatively and leads to the risk of early loosening in the rotational (rotation) movements that will occur in time. In the current art, a reduction in diameter and insufficiency in strength occurs in the modular stems which provides connection with the screw and early loosening risk in rotational (rotation) movements occurs.

In the current art, the prostheses applied to the wrist have a more plain and single-plan surface. These conditions limit the movement area of the wrist after prosthetic surgery.

As a result of the studies made in the literature, there is no such a system or a patent in relation with a prosthesis which increases the patient's quality of life by simulating the movements performed by the anatomic wrist joint in the best manner (similar to the real), provides suture passages on the dorsal surface of the anatomic radial component in tumoral or traumatic conditions, decreases the risk of adhesion of the bone tissue remaining on the prosthesis or the adhesion between tendon and prosthesis, wherein the anatomic radial component has a design suitable for the metaphyseal region sigmoid notch, the polyethylene carpal bearing has a design that will mimic the anatomy of the carpal bones of the wrist.

Aim of the Invention

The aim of the novel wrist prosthesis which is developed for solving the above mentioned and existing problems in the state of the art are as follows.

The aim of the invention is to eliminate the painful joint deformations caused by osteoarthritis, rheumatoid arthritis, traumatic arthritis, tumor, fracture etc. in the medical field and to enable the wrist appearance to be similar to the real by means of the prosthesis serving as a joint. In cases where the normal anatomical structure of the whole wrist is lost such as in large bone defects that are tumoral or traumatic, degenerative, the problem can be solved at once with one wrist prosthesis set with the invention.

Since the anatomic and the radial component and the modular stems of the invention have different diameter and length options, it is possible to use the same in revision and tumoral cases .

In the invention, there is one or a plurality of suture holes on the anatomical radial component dorsal surface. Especially in traumatic situations, the risk of bone tissue remaining on the prosthesis or occurrence of adhesions between the prosthesis and the tendon is eliminated by means of the holes on the anatomic radial component dorsal surface that enables the suture passages.

Since the invention has a design that is suitable for the anatomic radial component metaphyseal region sigmoid notch, it can be used when necessary in a manner that can mimic the distal radioulnar joint.

The carpal component in the invention is fixed to the metacarpals except for the metal back, stem with the lock screws. This situation eliminates the early loosening risk by means of increasing the stability (durability) of the carpal component .

In the invention, the connection of the radial shaft and the radial metaphyseal is provided with the conical intertwinement system in the modular stems. Therefore, the stability (durability) of the stem increases and the risk of early loosening that will occur with micro movements in time decreases .

The radial stems in the invention are designed by using two different coating methods such that they are suitable for both cemented and cementless applications. This provides an option for the stem which will be used in the surgical process based on the current bone stock of the patient and decreases the risk of early loosening in rotational (rotation) movements.

The polyethylene carpal bearing in the invention is designed to mimic the real anatomy of the wrist carpal bones. The polyethylene carpal bearing which can be produced in different sizes and dimensions can mimic the condition of the carpal bones by means of the scaphoid, lunatum, triquetrum. This situation also contributes to the stability (durability) of the prosthesis after the implantation of the prosthesis.

Detailed Description of the Invention

In order to fulfill the aim of this invention, this product which is an orthopedic prosthesis and its components to be used in the reconstruction of the defects occur as a result of the distal radius and/or any reason in carpal bones, are shown in the attached figures.

In these figures;

Figure 1 - is a perspective view of the components and elements (Primary Hand-Wrist) of the illustrative embodiment of the invention in a disassembled manner. Figure 2 - is a perspective view of the components and elements (Tumor Hand-Wrist) of the illustrative embodiment of the invention suitable for use in tumoral or traumatic situations in a disassembled manner.

Figure 3a - is a bottom perspective view of the carpal component which has the movement capability together with the invention.

Figure 3b - is a side sectional view of the carpal component which has the movement capability together with the invention.

Figure 3c - is a top view of the carpal component which has the movement capability together with the invention. Figure 4a - is a bottom perspective view of the polyethylene carpal bearing which has the movement capability together with the invention.

Figure 4b - is a side view of the polyethylene carpal bearing which has the movement capability together with the invention.

Figure 4c - is a top view of the polyethylene carpal bearing which has the movement capability together with the invention.

Figure 4d - is a side sectional view of the polyethylene carpal bearing which has the movement capability together with the invention.

Figure 4e - is a side sectional view of the polyethylene carpal bearing which has the movement capability together with the invention.

Figure 5a - is a bottom perspective view of the anatomic radial component which has the movement capability together with the invention.

Figure 5b - is a side sectional view of the anatomic radial component which has the movement capability together with the invention.

Figure 5c - is a view of the suture holes on the anatomic radial component which has the movement capability together with the invention. Figure 5d - is a side view of a recess which is located on the side surface of the anatomic radial component that has the movement capability together with the invention and fits to the metaphyseal region sigmoid notch.

Figure 5e - is a side sectional view of the female taper located on the anatomic radial component which has the movement capability together with the invention.

Figure 6a - is a side sectional view of the cementless modular stem which has the movement capability together with the invention.

Figure 6b - is a side sectional view of the cement modular stem which has the movement capability together with the invention .

Figure 7a - is a top perspective view of the extension piece which has the movement capability together with the invention .

Figure 7b - is a side sectional view of the extension piece which has the movement capability together with the invention .

Figure 7c - is a top view of the extension piece which has the movement capability together with the invention. Figure 8a - is a top perspective view of the round profile extension piece which has the movement capability together with the invention.

Figure 8b - is a side sectional view of the round profile extension piece which has the movement capability together with the invention.

Reference Numbers

1. Carpal Component

1.1 Grooved Shaft

1.2 Side Nails

1.3 Screw Holes 2. Polyethylene Carpal Bearing

2.1 Polyethylene Carpal Bearing Thickness

2.2 Spherical Protrusions on Surface

2.3 Nail on the Base

3. Anatomical Radial Component

3.1 Recessed Section on Side Surface

3.2 Suture Holes

3.3 Pin Hole

3.4 Female Taper on the Anatomical Radial Component base

4. Cementless Modular Stem

4.1 Shaft Section Channel Profile

4.2 Male Taper on the base of the Cementless Modular Stem

5. Cement Modular Stem

5.1 Coated Round Profile

5.2 Male Taper on the base of the Cemented Modular Stem

6. Extension Piece

6.1 Female Taper on the Extension Piece Base

6.2 Male Taper on the upper section of Extension Piece

6.3 Rotation Pin

7. Round Profile Extension Piece

7.1 Female Taper on the Round Profile Extension Piece Base

7.2 Male Taper on the upper section of Round Profile Extension Piece

In Figure 1, the perspective views of the following elements; carpal component (1), polyethylene carpal bearing (2), anatomical radial component (3), cementless modular stem (4) and cemented modular stem (5) are given in a perspective manner . In Figure 2, differently from Figure 4, the perspective views of the extension piece (6) and round profile extension piece (7) elements in disassembled manner for use in tumoral or traumatic situations in large bone defects are shown.

The carpal component (1) included in Figures 3a, 3b, 3c comprises at least two screw holes (1.3) with different diameters, grooved shaft (1.1) and nail. The risk of loosening of the prosthesis due to the movement of the hand is eliminated by means of the locked screws used in the carpal component (1) .

The polyethylene carpal bearing (2) included in Figures 4a, 4b, 4c, 4d, 4e can be produced and used in different sizes and different thicknesses. Therefore, it can be adapted to different joint sizes. There are spherical protrusions (2.2) on the surface portion of the polyethylene carpal bearing (2) similar to the carpal bone anatomy. The spherical protrusions (2.2) on the surface of the polyethylene carpal bearing (2) provides movement range suitable to the carpal bone anatomy and stability (durability) after implantation.

There is a recess (3.1) on the side surface of the anatomic radial component (3) included in Figures 5a, 5b, 5c, 5d, 5e which can fit to the metaphyseal region sigmoid notch. There are suture holes (3.2) which provide suture passages on the dorsal surface of the anatomic radial component (3) and the use of suture materials. After the extension parts (6,7) are mounted at the base of the anatomic radial component (3), there is a pin hole (3.3) that prevents rotation.

The cementless modular stem (4) included in Figure 6a and the cemented modular stem (5) included in Figure 6b provides cementless compression with the shaft section channel profile (4.1) and coated round profile (5.1) . The modular stems are applied to the radius bone. The male taper (4.2) on the base of the cementless modular stem and the male taper (5.2) on the base of the cemented stem provide the connection between the anatomic radial component (3) and the stems.

The extension part (6) included in Figure 7a, 7b, 7c are used in articulation or tumoral applications. The female taper (6.1) on the base of the extension part provides the conical connection between the cementless and cemented modular stems (4,5) and the extension part (6) . The male taper (6.2) on the upper portion of the extension piece provides the connection between the anatomic radial component (3) and the extension piece (6) . During the connection between the anatomic radial component (3) and the extension piece (6), rotation can occur. There is a rotation pin (6.3) on the upper portion of the extension piece (6) in order to prevent the rotation.

The round profile extension piece (7) included in the Figures 8a, 8b is used in tumor cases. The female taper (7.1) on the base of the round profile extension part provides the conical connection between the cementless and cemented modular stems (4,5) and round profile extension part (7) . The male taper

(7.2) on the base of the round profile extension part provides the conical connection between the extension part (6) and the round profile extension part (7) .

The prosthesis can be located to the third metacarpal bone by means of being centered to the capitatum bone and fixed without cement by means of the grooved shaft (1.1) on the base of the carpal component (1) and the locked screws. Subsequently, the polyethylene carpal b earing (2) and the carpal component (1) are locked to each other by means of the nail (2.3) located on the base of the polyethylene carpal bearing (2) and the nails (1.2) located on the side portions of the carpal component (1) . Then, the female taper (3.4) on the base of the anatomic radial component (3) provides the conical connection between the cementless modular stem (4) or cemented modular stem (5) and the anatomic radial component (3) (Figure 1) . As the last phase, the modular stems are applied to the radius bone. Moreover, in tumoral or traumatic situations, extension piece (6) and round profile extension piece (7) can be used between the anatomic radial component (3) and the cementless modular stem (4) or cemented modular stem (5) .