WO2016080921A1

WO2016080921A1 - Magnetic apparatus for wire retainers

Info

Publication number: WO2016080921A1
Application number: PCT/TR2014/000441
Authority: WO
Inventors: Emre KARADENİZ
Original assignee: Karadeni̇z Emre
Priority date: 2014-11-20
Filing date: 2014-11-20
Publication date: 2016-05-26

Abstract

The invention is related to a magnetic apparatus which is used to take the wire retainers -that fasten the k- wires which are used for compressing and fixing the fragments by being past through the bone- out of their place after the union of the fractured fragments.

Description

DESCRIPTION MAGNETIC APPARATUS FOR WIRE RETAIN ERS TECHNICAL FIELD

The invention is especially related to a magnetic apparatus which is used to remove the wire retainers. These wire retainers fasten the Kirschner wire that is used for compressing and fixing the fractured fragments by being past through the fracture line. After bone healing gained by these, wire retainers, these wire retainers are taken out of the skin with the help of this magnetic apparatus.

PRIOR ART Techniques developed for fracture treatment until today are Kirschner wire (k-wire), screw, plate screw, intramedularry nail and external fixation. The purpose of these techniques is to fix the fractured fragments in the desired position until healing. The advantages and disadvantages of these techniques change according to the type of fracture and shape the treatment plan of the surgeon.

Among these techniques, in technique of fixation with k-wire, after setting (reducing) the fragments these wires are past through the bone fragments and thus, the broken bones are fixed. After reduction; the broken bones may move forward and backward through the wire since the wires can not provide compression between fragments. Additionally these wires may migrate after being placed into the body.

In fracture fixation with screw, the fragments are first placed into their original places. Compression between the fragments is obtained according to the principle of forming mutual force between the screw head, and the screw threads which is the working principle of screw. In this technique it is required to increase the dimensions of the screw to increase the compression force and the adherence. However, if the sizes of the fragments are small, the dimension of the screw can not be increased. Due to the screw size, no space may be left to locate an additional screw between the fragments. Additionally, as a surgical technique, first the bone is drilled with a drill and then, thread holes are opened for screw thread and afterwards, the screw is placed. Additionally, before these processes, sometimes k-wire is needed to be placed to guide the screw. As a result, the surgical technique is relatively complex. Moreover, the compression provided by screw threads may not be enough for patients with osteoporosis.

In fixation of the broken bones with plate and screw, after reducing, the broken fragments are fixed to their locations by plates held by screws. However, since the plates are held by screws, all of the disadvantages of screw technique are also experienced in here. The process of placing plates requires the abrasion of more tissue surrounding the bone. This means more incision and more vascularization problem for the bone pieces. The plate may prevent the healing of skin where the subcutaneous tissue is very thin and may be felt by hand. When the bone pieces are small or very close to the joints, it is impossible to place the plates. Additionally, when they are needed to be taken out, the surrounding tissue is damaged again.

As a result, due to the disadvantages mentioned above and the insufficiency of the present solutions, the product with application no 2010/05662 and title "A wire retainer" is developed different from the known methods.

This magnetic apparatus which is the subject for this application developed to take the wire retainers out, after their usage in fracture treatment. OBJECTIVE OF THE INVENTION

The main objective of the invention is to present an embodiment comprising magnet in order to take the "wire retainers" - which is a subject to the patent with examination - out of the skin after bone healing with little damage to the soft tissues.

The object of the invention is to take the wire retainers out with percutaneous techniques during the removal of implants by minimizing the damage given to the bones and the surrounding soft tissue. The structural and distinctive characteristics and all advantages of the invention will be better understood with the figures below and the detailed description written by referring to these figures and therefore, the invention should be evaluated considering these figures and the detailed explanations. FIGURES FOR A BETTER UNDERSTANDING OF THE INVENTION

Figure 1 , is the general view of the magnetic apparatus subject to the invention. Figure 2, is the view of the magnetic apparatus subject to the invention in usage with cannula. DESCRIPTION OF THE REFERENCES R. Retainer

1. End part

2. Magnet

3. Body

4. Holding Part

5. Kirschner wire

6. Working Cannula

It is not necessary to scale the drawings and the details which are not necessary for a better understanding of the invention may be omitted. Additionally, the elements which are at least substantially identical or at least substantially have identical functions are shown with the same reference number.

DETAILED DESCRIPTION OF THE INVENTION In this detailed description, preferred embodiments of the subject to the invention are described only for a better understanding of the subject.

The invention is used together with "A wire retainer" which is subject to the patent application number 2010/05662 from Turkish Patent Institute and used in the fixation of the broken bones. Said magnetic apparatus especially provides the removal of the wire retainers subject to the patent application number 2010/05662, with percutaneous techniques.

Since the dimension of this "wire retainer" is equal to the size of screw heads; theretainer (R) occupies a much smaller space compared to the plates located onto the fragments and the problem of feeling the retainer (R) with hand is experienced rarely. Since the compression force provided by threads in screws requires adherence to the bone marrow; the usage of screw causes difficulties in patients with low bone quality. However, since "a wire retainer'' provides holding over the bone cortex, it provides very important usage advantages in patients with low bone quality such as osteoporosis. Since cortical adherence is provided with "a wire retainer", the problem of dislocation of retainers (R) is not experienced. By using magnetic apparatus to remove the wire retainers (R) from their location after the fracture treatment, the damage given to the bone and/or the surrounding tissue is minimized. After the removal of the wire retainers (R), also the wires may be removed much easier by percutaneous techniques.

Magnetic apparatus subject to the invention in general comprises;

- the body (3) which takes the wire retainers out of the tissue by passing through the working cannula (6) after unscrewing the upper part of wire retainers (R) with percutaneous techniques;

- an end part (1 ) which grips the wire retainer (R) and is suited for the dimension and the shape of the wire retainer (R);

- a magnet (2) located at the end part (1 ) of the body (3) and shaped in accordance with the dimensions of wire retainer (R), for gripping the wire retainer (R) and preventing its disconnection from the apparatus while removing it from its location;

- holding part (4) which provides manipulation to the apparatus.

This magnetic apparatus developed for wire retainer (R) provides the removal of said retainer (R) after the completion of the healing of fracture. By the virtue of its body (3), it provides access to the wire retainer (R) through the working cannula (6) with percutaneous . technique. Manual guiding is possible by means of holding part (4).

Magnet (2) present at the end part (1 ) which is shaped in accordance with the dimensions of the wire retainer (R) pulls the magnetic active (ferromagnetic) balls of the wire retainer (R) disclosed in patent application 2010/05662 when it is approached and connected to the wire retainer (R).

In an alternative embodiment of the invention;

The end part (1 ) of the invention may comprise magnet grooves having different shapes, varieties and dimensions in accordance with the dimension and shape of the wire retainer (R). The magnet may have different diameters, shapes, dimensions and varieties. The shape of the body (3) subject to the invention may have a different shape (other than cylinder, such as hexagonal, rectangle) and length. The holding part (4) of the invention may be "T", "L", "C" shaped or may have another shape. The magnetism of the invention may be provided by electrical systems.

Claims

1. A magnetic apparatus which removes the retainers (R), which are used for compressing and fixing the fragments , out of the skin by passing through a working area formed by a working cannula (6) and following the Kirschner wire (5) to which the retainers (R) are fixed at a distance from the bone to the skin; said magnetic apparatus characterized in comprising;

- the body (3) which takes the wire retainers out of the tissue by passing through the working cannula (6) after loosening of wire retainer (R ) upper part with percutaneous techniques;

- an end part (1) which grips the wire retainer (R) and is suited for the dimension and the shape of the wire retainer (R);

- a magnet (2) located at the end part (1 ) of the body (3) for gripping the wire retainer (R) and preventing retainer's (R) disconnection from the apparatus while removing retainer ( ).

2. Magnetic apparatus according to Claim 1 , characterized in that said magnet (2) have a shape in accordance with the dimensions of the wire retainer (R).

3. Magnetic apparatus according to Claim 1 or 2, characterized in comprising holding part (4) which provides manipulation to the apparatus.