WO2021251935A1

WO2021251935A1 - An orthopedic implant

Info

Publication number: WO2021251935A1
Application number: PCT/TR2021/050555
Authority: WO
Inventors: Ergun SELIM
Original assignee: Acibadem Mehmet Ali Aydinlar Universitesi
Priority date: 2020-06-08
Filing date: 2021-06-08
Publication date: 2021-12-16
Also published as: TR202008814A2

Abstract

The present invention relates to an orthopedic implant (1) which restores broken pieces to a normal anatomical position by performing a dynamic fracture reduction move by means of the proximal femoral nail (2) and the lag screw (3) it includes, without the need for open surgery in case of a reverse oblique fracture experienced in the hip.

Description

AN ORTHOPEDIC IMPLANT Technical Field

The present invention relates to an orthopedic implant which restores broken pieces to a normal anatomical position by performing a dynamic fracture reduction move without the need for open surgery in case of a reverse oblique fracture experienced in the hip.

Background of the Invention

In surgical treatment of hip fractures, proximal femoral nail (PFN) is used during transaction of restoring the fracture to its normal anatomical structure (reduction) by means of traction maneuvers without ever opening the fracture line in patients. PFN is frequently preferred in the practice of orthopedics and traumatology as a quite stable and successful fixation method. In treatment of hip fractures of reverse oblique type, reduction is tried in order to restore a bone -which is located in an inclined position relative to the anatomical structure- to its anatomical position by means of traction table at first. It is not east to correct a bone in an inclined position by restoring it to its anatomical structure by means of maneuvers to be performed on the traction table. If these maneuvers fail, the surgeon prefers inserting anatomical proximal femoral plate at the expense of larger incision and thus more bleeding by giving up the nail fixation operation through closed method. Bleeding occurs more in these operations, it is not possible to lean against early (cannot step on), it’s stability is less than nail surgery. Due to the fact that the fracture line is reduced by means of open surgery, the risk of nonunion increases for the fracture. Therefore, novel implant models are needed in order to avoid open surgery in reverse oblique fractures and increase the chance of treatment by means of proximal femoral nail even in difficult cases. The Japanese patent document no. JP2009112594, an application in the state of the art, discloses a nail that is used for joining femoral fractures. The nail is inserted into a cavity of a broken bone and a screw is allowed to pass through a slant through-hole of the nail. The screw lies between broken bones and enables to join the bones.

Summary of the Invention

An objective of the present invention is to realize an orthopedic implant which restores broken pieces to a normal anatomical position by performing a dynamic fracture reduction move by means of the proximal femoral nail and the lag screw it includes, without the need for open surgery in case of a reverse oblique fracture experienced in the hip.

Another objective of the present invention is to realize an orthopedic implant which enables to restore a fracture to the right position without the need for invasive methods by means of improvements made in the current proximal femoral nail and the lag screw that are used for treatment of reverse oblique fracture in the hip.

Another objective of the present invention is to realize an orthopedic implant which increases the chance of treatment for reverse oblique fracture by means of femoral nail with an elliptical-shaped lag hole.

Another objective of the present invention is to realize an orthopedic implant which increases the chance of treatment for reverse oblique fracture by means of lag screw with conical dimensions that thickens progressively from the tip to the head part. Another objective of the present invention is to realize an orthopedic implant which enables to restore the bone to the right position by reaching the right angle while proceeding in the elliptical hole by starting to send the lag screw to the lag hole in the femoral nail that is inserted into the cavity inside the bone for correcting the bone in the fractured position, with an angle that is more acute than it should be in its normal anatomical structure in the beginning.

Detailed Description of the Invention

“An Orthopedic Implant” realized to fulfil the objectives of the present invention is shown in the figures attached, in which:

Figure 1 is a view of a proximal femoral nail having the inventive elliptical-shaped lag hole and its elliptical hole detail.

Figure 2 is a view of the inventive conical-shaped lag screw.

Figure 3 is an image indicating proceeding of the orthopedic implant, which consists of the inventive lag screw and the femoral nail, inside the bone in the treatment process and the steps of restoring the fracture to its normal anatomical position by comparing these with the current orthopedic implant movements.

The components illustrated in the figures are individually numbered, where the numbers refer to the following:

1. Orthopedic implant

2. Proximal femoral nail 2.1. Hole

3. Lag screw

A: Constant -diameter lag screw The inventive orthopedic implant (1) which restores broken pieces to a normal anatomical position by performing a dynamic fracture reduction move without the need for open surgery in case of a reverse oblique fracture experienced in the hip comprises:

- at least one proximal femoral nail (2) which is in the form of a long and thin rod; inserted into the cavity inside the thighbone (femur) upon being introduced from its tip part and pushed from its head part, and also has at least one hole (2.1) in a position close to the head part that is bored with an angle non-parallel to the long side; and

- a lag screw (3) which has a conical rod-shaped configuration that thickens progressively from the tip part to the head part, and is provided in dimensions suitable for passing through the hole (2.1).

The proximal femoral nail (2) included in the inventive orthopedic implant (1) has a rod-shaped configuration that includes an end part and a head part preferably with an elliptical hole (2.1). The proximal femoral nail (2) is inserted by being pushed into the cavity inside the femoral body upon being introduced from the peak point of the broken head part of the femur having the reverse oblique fracture from its end part, and thus forms the stable base required for the treatment.

The hole (2.1) included in the proximal femoral nail (2) is located in a position close to the head part of the nail (2) and thus at a point close to the broken femoral head as well; carries the border of the hole -bored in a certain diameter at an angle of 135 degrees, i.e. at an angle parallel to the anatomical angle of the femoral head to the femoral body in a preferred embodiment of the invention- that is distal and close to the tip part, with the long side of the nail (2) towards the tip part more distal in a certain amount; and is formed by adding a new narrower hole that opens in such a way that it will make an angle of preferably 95 degrees with the long side. In other words, the hole (2.1) has an elliptical configuration created by these two holes that open to the nail (2) side at an angle of 95 degrees and intersect with each other in such a way that they will carry the internal border of the hole -that is bored to the nail (2) side at an angle of 135 degrees in a position close to the head part of the nail (2)- to the end part some more.

In a preferred embodiment of the invention, the hole (2.1) is obtained by widening a hole, that is in a position close to the tip part between two lag holes in a standard femoral nail, in such a way that its diameter is 10 mm at an angle of 135 degrees to the nail (2) side (i.e. at an angle parallel to the anatomical angle of the femoral head to the femoral body); then carrying the internal border of the same hole towards the tip part, to the tip part 2 mm more; adding a narrow hole with a diameter of 8 mm in such a way that it will make an angle of 95 degrees with the nail (2) side.

The lag screw (3) included in the inventive orthopedic implant (1) has a threaded tip part with a certain length and a conical configuration thickening progressively from the tip part to the head part. The lag screw (3) is proceeded from the threaded tip part in such a way that it will enter the hole (2.1) section with a narrow diameter and an angle of 95 degrees. Meanwhile the lag screw (3) enters into the broken part of the broken femoral head from its side, due to the fact that the hole (2.1) is in alignment with the broken femoral head. As the lag screw (3), which is sent into the elliptical hole (2.1) with an angle of less than 135 degrees (preferably 95 degrees) in the beginning in order to correct the fracture on the broken femoral head is proceeded, the thick part of the conical screw overflows to the wide area in the hole and it can be ensured that the femoral head is restored to the angle in the normal anatomical position as a result of the orientation occrring by means of the angle change created.

In an embodiment of the invention, the lag screw (3) is proceeded upon being introduced from the hole of the elliptical hole (2.1) -having a variable diameter- that has an angle of 95 degrees and a diameter of 8 mm and in the event that it cannot fit into the diameter of 8 mm because of the conical configuration, it is enabled to be corrected upon being turned into a form of 135 degrees that is its normal anatomical angle with the femoral body of the femoral head having the reverse oblique fracture, by moving the proximal femoral nail (2) after being directed towards the hole of 135 degrees and a diameter of 10 mm.

In a preferred embodiment of the invention, the lag screw (3) has an overall length of 95 mm; the threaded part starting from the tip part proceeds at a length of 31 mm and a diameter of 8 mm, the part extending from the threaded part towards the head part proceeds at a constant diameter of 8 mm along 29 mm and the part of 35 mm in the head part proceeds conically from a diameter of 8 mm towards a diameter of 10,65 mm.

The inventive orthopedic implant (1) enables to restore broken parts to the ideal position according to the anatomical structure without applying to open surgery by enabling to perform a dynamic fracture reduction move during treatment of reverse oblique fracture thanks to the proximal femoral nail (2) having the hole (2.1) and the lag screw (3) with a conical configuration. How to perform dynamic fracture reduction move is explained in the Figure 3 by simultaneously indicating the proceeding of the lag screw (3) that proceeds inside the hole (2.1) and the constant-diameter lag screw (A) that proceeds inside the hole being used currently.

Within these basic concepts; it is possible to develop various embodiments of the inventive orthopedic implant (1); the invention cannot be limited to examples disclosed herein and it is essentially according to claims.

Claims

1. An orthopedic implant (1) which restores broken pieces to a normal anatomical position by performing a dynamic fracture reduction move without the need for open surgery in case of a reverse oblique fracture experienced in the hip; characterized by

2. An orthopedic implant (1) according to Claim 1; characterized by the proximal femoral nail (2) which has a rod-shaped configuration that includes an end part and a head part preferably with an elliptical hole (2.1).

3. An orthopedic implant (1) according to Claim 1 or 2; characterized by the proximal femoral nail (2) which is inserted by being pushed into the cavity inside the femoral body upon being introduced from the peak point of the broken head part of the femur having the reverse oblique fracture from its end part, and thus forms the stable base required for the treatment.

4. An orthopedic implant (1) according to any of the preceding claims; characterized by the hole (2.1) which is located in a position close to the head part of the nail (2) and thus at a point close to the broken femoral head as well; carries the border of the hole -bored in a certain diameter at an angle of 135 degrees, i.e. at an angle parallel to the anatomical angle of the femoral head to the femoral body- that is distal and close to the tip part, with the long side of the nail (2) towards the tip part more distal in a certain amount; and is formed by adding a new narrower hole that opens in such a way that it will make an angle of preferably 95 degrees with the long side.

5. An orthopedic implant (1) according to any of Claim 1 to 3; characterized by the hole (2.1) which has an elliptical configuration created by these two holes that open to the nail (2) side at an angle of 95 degrees and intersect with each other in such a way that they will carry the internal border of the hole -that is bored to the nail (2) side at an angle of 135 degrees in a position close to the head part of the nail (2)- to the end part some more.

6. An orthopedic implant (1) according to any of the preceding claims; characterized by the lag screw (3) which has a threaded tip part with a certain length and a conical configuration thickening progressively from the tip part to the head part.

7. An orthopedic implant (1) according to any of the preceding claims; characterized by the lag screw (3) which is proceeded from the threaded tip part in such a way that it will enter the hole (2.1) section with a narrow diameter and an angle of 95 degrees.

8. An orthopedic implant (1) according to any of the preceding claims; characterized by the lag screw (3) which enters into the broken part of the broken femoral head from its side, due to the fact that the hole (2.1) is in alignment with the broken femoral head.

9. An orthopedic implant (1) according to any of the preceding claims; characterized by the lag screw (3) which is sent into the elliptical hole (2.1) with an angle of less than 135 degrees (preferably 95 degrees) in the beginning in order to correct the fracture on the broken femoral head is proceeded; wherein its thick part overflows to the wide area in the hole and it can be ensured that the femoral head is restored to the angle in the normal anatomical position as a result of the orientation occrring by means of the angle change created.

10. An orthopedic implant (1) characterized in that it enables to restore broken parts to the ideal position according to the anatomical structure without applying to open surgery by enabling to perform a dynamic fracture reduction move during treatment of reverse oblique fracture tahnks to the proximal femoral nail (2) having the hole (2.1) and the lag screw (3) with a conical configuration.