SIZE ADJUSTABLE LOCKING COMPRESSION SCREW TECHNICAL FIELD

The invention relates to compression screws used in the step of fracture fixation and compression during orthopedic surgical interventions in the field of medicine.

The invention particularly relates to allowing a stable compression by means of the designed locking system the size of which can be changed during surgical intervention, according to the case in which said compression screws are to be applied.

STATE OF THE ART

At the present time, apparatus and methods known to the medical field for healing and treating broken bones in the body generally require surgical operation. ORIF (open reduction internal fixation) is a technique developed to heal the fractured bone surgically, typically using plates and screws or inter marrow (I M) stick in order to fix the fractured bone in the body. I n this technique, there are many factors that prevent the surgical operation from always being successful. Treatment methods; also effects the healing period, pain and function results seriously. Apart from that, the risk of infection, anesthetic complications and health care costs of the patient creates the need to shorten the duration of the surgical intervention.

Compression screws are used particularly for mechanically binding bone fractures. The compression screws designed so as to be a metal shaft have screw threads (sprockets) at their free ends. The screw threads have different inclinations so that a compression (tightening) occurs during screwing of the screw to the bone. Compression term; denotes the union of the fracture as a result of moving of these bone fractures towards each other and contacting by getting closer of two bones to each other by virtue of screwing of the screw into the two bone fractures.

I n today's technique, treatments are performed with screws having different thread pitches on both the head and the back, which consist of a single body with a name given acutrak for combining broken fragments and performing compressions. The disadvantages of these screws are; that it is difficult to adjust the screw size during surgery and the compression effect is limited. During the operation, especially if the screw size is long or short, the screw must be replaced, and this can cause fragmentation in the bone owing to multiple screw insertion and extraction on the bone. As a result of this, the effect on surgery result and bone union is greatly affected.

I n the utility model document titled "Multipurpose ulna intramedullar locking nail" numbered "2009/03589" in the patent research made in the present art, the invention is outlined as "the invention relates to a multi-purpose ulna intramedullary locking nail which ensures union of the bone by fixing in segmental or single fractures of ulna bone and fixes both ends of a nail with screws by centering the fractured portion of the bone by applying through medulla of ulna bone characterized in that; the proximal body of the ulna nail (ulna nail) made of implant material, guide locking channel of the ulna nail, the compression screw hole, the oblique thread compression hole, the oval compression hole, the round fixing hole, the distal body of the ulna nail, the distal locking chutes of the ulna nail, the distal end of the ulna nail, the distal body of the ulna nail that consist of multi wires, the locking screw that performs proximal locking and compression of the ulna nail, the screwdriver socket of the locking screw, the cortical threaded part of the locking screw, the threaded part making compression by screwing the locking screw into ulna nail, the compression washer, the application guide of ulna nail, the flexible thin wires of ulna A nail that consist of multi wires which takes place on distal body of the ulna A nail that consist of multi wires, the body of ulna nail in different diameters.

As a result, the existence of the above problems and the inadequacy of existing solutions have made it necessary to make development in technical field related to compression screws.

AIM OF THE INVENTION

The main object of the invention is to provide a stable compression at one time and with strong compressive effect by adjusting the length of the screw according to the case, without the length problem to area to be applied by means of the compression screw having the locking system which can be lengthened or shortened during the surgical intervention.

The object of the invention is to ensure shortening of the length of the screw by the designed locking mechanism if necessary according to the case (area) to be applied and fixing the front and rear parts of the screw in a stable manner by means of locking to each other by thread and thread housings on the male and female lock parts.

A further aim of the invention is to ensure both closing the gap between the fracture fragments and compressing them by contacting with each other by shortening the size of the screw after replacement to area to be applied.

Another object of the invention is to realize the operation without the necessity of screw replacement especially if the size of the screw is too long during the surgery. Thus, fragmentation of bone, that may occur because of multiple insertion and extraction of screw when the length of the screw is too much, is prevented.

Another different object of the invention is both to allow doctors to intervene in a larger number of cases by shortening the duration of surgical intervention and to ensure that the union of the bone on which compression is applied begins faster. Another purpose of the invention is to both make the patient heal more quickly and minimize the screw costs by preventing the use of multiple screws due to the long or short length, during the surgical intervention.

Structural and characteristic specifications and all advantages of the invention will be understood more clearly by means of following figures and detailed descriptions written by referencing to those figures and therefore assessment should be done by taking into consideration these figures and detailed description.

BRIEF DESCRIPTION OF THE FIGURES

For the best understanding of the advantages together with additional components and the structure of the present invention it should be evaluated in association with the figures which are described below

Figure 1 ; is perspective view of the front and rear parts of the compression screw which is subject of the invention.

Figure 2; is demounted view of the front and rear of the compression screw which is subject of the invention.

Figure 3a; is view of the locking system consisting of front and rear parts of the compression screw which is subject of the invention.

Figure 3b; is detailed view of the locking system consisting of front and rear parts of the compression screw which is subject of the invention.

Figure 4; is perspective view of the locking system and front and rear parts of the compression screw which is subject of the invention.

Figure 5; is general perspective view of the compression screw which is subject of the invention.

REFERENCE NUMBERS

V. Compression screw

A. Front part

B. Rear part

K. Locking system

1. The diameter of the threaded portion 2. The diameter of front Body

3. The diameter of lumen

4. The diameter of male lock

5. Locking threads

6. Thread housing

7. The diameter of female lock

8. The diameter of rear threaded portion

9. Stretching space

10. Male locking compressing space

11. Female locking compressing space

12. Front compression threads

13. Rear compression threads

14. Female locking

15. Male locking

The drawings don't necessarily require to be scaled and the unnecessary details may be left out to understand the present invention. Furthermore, the components at least significantly identical or at least have significantly identical functions are indicated with same number. DETAILED DESCRIPTION OF THE INVENTION

This detailed description explains the preferred embodiments of compression screw (V) that is subject of the invention only intended for better understanding the subject and in a manner that is not creating any restricting effect.

Figure 1 shows perspective views of the front part (A) and rear parts (B) of the compression screw (V) that is subject of the invention. The compression screw (V) that is subject of the invention mainly consists of two parts. It consists of the first part which is the front part (A) which has thread portion in front and cavity in it, and the rear part (B) which has the thread mechanism that allows the shortening of the compression screw (V) and then doesn't allow it to lengthen back by locking, on the rear side of that front part (A).

Figure 2 shows demounted views of the front part (A) and rear parts (B) of the compression screw (V) that is subject of the invention. The front part (A), which will first contact with the area to be applied, consists of two parts, namely the part on which the front compression threads (12) are located and the male lock (15) part. Similarly, the rear part (B) consists of two parts, namely the part in which the rear compression threads (13) are located and the female lock (14).

The portion which is on the front compression (12) threads of the front part (A) consists of three different diameters. Outermost; it consists of the diameter of the threaded portion (1) to the diameter of the portion from front compression threads (12) to the screw center, the diameter of front body (2) of non-threaded body of compression screw (V) and the diameter of lumen (3) that constitutes the inner part of the compression screw (V), and there is a relation between them as the diameter of threaded portion (1) > the diameter of the front body (2) > the dimeter of lumen (3). The diameter of the male locking (15) constituting the other part of the front part (A) is called the diameter of male lock (4). The said diameter male lock (4) and the diameter of lumen (3) are equal in length.

The diameter of the portion that is on the rear compression threads (13) of the rear part (B) is specified as the diameter of the rear threaded portion (8). The diameter of the female locking (14) constituting the other part of the front part is called the diameter of male lock (7).

Figure 3, 3a and 4 show perspective views of the locking system (K) and front part (A) and rear parts (B) of the compression screw (V) that is subject of the invention. The locking system that is key element of the invention (K); consists of two parts namely the female locking (14) and the male locking (15). The male locking (15) is in the part called as the front part (A). Said male locking (15) has locking threads (5) on its outer side which are formed at equal intervals and provide locking. The female locking (14) is in the part called as the rear part (B). There are thread housings (6), which are grooved so as to be suitable with the lock threads (5), in the inside portion of said female locking (14). On the outside of said female locking (14), a plurality of stretching spaces (9) are formed which allow the male locking (15) to move inside of the female locking (14) without breaking.

Locking threads (5) formed on the outer side of the male locking (15) so as to be compliance with thread housings (6) in inner side of female locking (14) form locking system (K) by conjoining each other. By means of that locking system (K) compression occurs between the bone fragments at the instant of shortening of the compression screw's (V) length. The compression created by the locking system (K) is permanently fixed (Figure-3b).

The movement of the female locking (14) and the male locking (15) inside the area to be applied in the body is provided by means of a screwdriver. The female locking compression space (1 1) is formed on the female screw 1 (4) and the male locking compression space (10) is formed on the male lock (15) for the screwdriver (Figure 4). Working Principle (Application):

Firstly, the compression screw (V) enters the area of the surgical intervention in one piece. If it is desired to shorten it when the size of it is too big according to the size of the area to be applied, the locking threads (5) shortens the length of compression screw (V) by moving through the thread housing (6) after rotating the screwdriver by reaching the female locking compression space (11) on the female locking (14) and from there to male locking compression space (10) on the male locking (15) by means of the screwdriver. The shortened compression screw (V) will not extend back in anyway owing to the developed locking system (K). Thus, a well-developed compression will be provided.