WO2014149015A2 - Locking plate-screw structure comprising a screw provided without threads on the screw head and locking directly into the screw hole disposed on the plate - Google Patents
Locking plate-screw structure comprising a screw provided without threads on the screw head and locking directly into the screw hole disposed on the plate Download PDFInfo
- Publication number
- WO2014149015A2 WO2014149015A2 PCT/TR2014/000085 TR2014000085W WO2014149015A2 WO 2014149015 A2 WO2014149015 A2 WO 2014149015A2 TR 2014000085 W TR2014000085 W TR 2014000085W WO 2014149015 A2 WO2014149015 A2 WO 2014149015A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- screw
- plate
- bone
- threads
- locking
- Prior art date
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
- A61B17/8052—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded
- A61B17/8057—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded the interlocking form comprising a thread
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/8605—Heads, i.e. proximal ends projecting from bone
Abstract
The present invention particularly relates to a locking plate-screw structure used in the treatment of bone fractures in orthopedic surgery and comprising a new locking structure, wherein the plate comprises an internally threaded screw hole comprising threads having thread pitches same as the thread pitches of the screw body.
Description
DESCRIPTION
Locking plate-screw structure comprising a screw provided without threads on the screw head and locking directly into the screw hole disposed on the plate
FIELD OF THE INVENTION
The present invention relates to a locking plate-screw system used in the treatment of bone fractures in the orthopedic surgery.
The present invention particularly relates to a locking plate-screw structure used in the treatment of bone fractures in orthopedic surgery and comprising a new locking structure and further relates to screws provided without threads and thread pitches on the screw head and relates to plates comprising threads suitable for thread pitches disposed on the screw hole used in said structures.
PRIOR ART
In the currently carried out surgical applications, first bones are placed in position during surgery for bone union in bone fractures. Then, state of the broken bone is fixedly maintained until union is achieved. For this purpose, bones should be tightly connected to each other by means of devices referred to as "bone fixation materials". A wide variety of these fixation materials is available. One of them is the "locking plate-screw" system used widely all over the world.
In said locking plate-screw systems, plate is placed on the fractured bone. Plate is fixed to the bone by means of screws above and below the fracture line. Threads formed on the screw heads, through the end of screwing, fit on the threads of the plate formed on the slot where the screw head will be seated. When the screw is screwed to the bone, screw head is also screwed to the plate. In this way, angular movement of the screw inside the holes formed on the plate is prevented. A rigid structure is formed by joining the plate and screw. This is an application improving the bone fixation. Prevention of the movement of screws inside the plate contributes to fracture fixation.
A very serious deficiency exists in this system widely used all over the world. The reason for this deficiency is due to the two groups of threads provided on the screw (Figure 4). These groups are the following:
a. "screw body threads" (a) screwed to the bone on the body; and
b. "screw head threads" (b) screwed to the plate on the head.
Although these two screw systems are present on the same screw, the screw thread pitches thereof are not the same. In other words, for example, when the screw completes a full turn, "screw body threads" advance 2 mm inside the bone, while, "screw head threads" can advance 1 mm inside the slot disposed on the plate. In this case, screw initially advances 2 mm for each turn inside the bone, while, when screw head is seated in the slot thereof and screw head is started to be screwed to the plate, it can only advance 1 mm with each rotation (turn).
3-4 turns are required for the screw head to be screwed to the plate. Thus, since the screw desiring to advance 2 mm inside the bone for each turn cannot perform it, the threads previously formed inside the screw path of the bone are crushed. As a result of the screw advancing inside the bone body crushing the screw path formed accordingly thereby (threads formed inside the bone on the screw path), screw path threads deform. Due to this deformation, engagement strength of the screw, thus, the plate to the bone decreases. This leads to a deficiency in fracture fixation. In said locking plate-screw systems, screwing of the screws to the bone and to the plate is carried out with different thread pitches. Presence of a different thread pitches on the same screw, i.e. the thread pitches being different, leads to bad results through the end of the screwing. When screw head is seated on the slot of the plate and screw is started to be screwed to the plate, screw cannot advance according to the threads formed thereby inside the bone. This breaks the protrusions formed inside the bone by the screw for engagement thereof. This situation severely disrupts the screw-bone connection.
Another disadvantage and deficiency of the existing system is that as soon as the screw advancing inside the bone by forming threads upon rotation thereof is seated on the slot disposed on the plate, interlocking of the screw head threads and plate threads by alignment thereof is left to the chance.
The threads on the screw head are rotated until they are seated on the screw channels disposed on the plate. During this rotation, the screw will desire to advance forcedly inside the bone, however, it cannot advance inside the bone unless locking does not start immediately. It leads to weakening of the bone-screw connection by crushing/breaking the bone threads inside the entire screw path formed thereby until that moment.
These disadvantages decrease the fixation strength of great importance of the screw, plate and bone connections.
In conclusion, an improvement or development in the locking plate screw system field, which is different from the known methods, is necessary due to the aforementioned drawbacks and insufficiency of the existing solutions in the field.
OBJECTS OF THE INVENTION Object of the present invention is to eliminate aforementioned drawbacks and to improve locking plate-screw structures by being inspired from the existing situations.
The object of the present invention is to treat bone fractures in the shortest time possible. The purpose of this treatment is to obtain the most accurate results.
Another object of the present invention is to enable the plate and screw to form a rigid structure.
Another object of the present invention is to prevent the screw advancing inside the bone from crushing the screw path formed accordingly thereby inside the bone (bone protrusions formed thereby on the screw path playing a very important role in engagement of the screw to the bone).
Another object of the present invention is to prevent reduction of engagement strength of the plate to the bone, thus, to present reduction of the fracture fixation strength.
Another object of the present invention is to avoid loosening of the plate-screw systems from the bone taking place on the bone fracture line. To achieve the aforementioned objects, the present invention relates to a locking plate- screw structure used in the orthopedic surgery for fixation and surgical treatment of bone fractures, comprising a plate having a screw head slot for screw head and a screw having a screw head with a screwdriver slot and interconnecting said plate and said screw, wherein
- screw head of said screw does not comprise threads;
- said plate comprises an internally threaded screw hole comprising threads having thread pitches same as the thread pitches of the screw body; and
said screw head slot does not comprise threads.
The structural and the characteristic features and all advantages of the present invention will be understood more clearly with the following figures and the detailed description written by referring to said figures, therefore, the evaluation needs to be done by taking said figures and the detailed description into consideration.
FIGURES Figure 1 is a cross sectional view of the plate according to the present invention.
Figure 2 is a cross sectional view of the screw according to the present invention.
Figure 3 is a top view of the screw hole disposed on the plate.
Figure 4 is a view of the prior art version of the structure according to the present invention.
DESCRIPTION OF PART REFERENCES
1. Plate
2. Screw
3. Screw head
4. Screw body
5. Screw head slot
6. Screwdriver slot
7. Thread
8. Thread pitch
9. Internally threaded screw hole
a. Screw body threads
b. Screw head threads Scaling of drawings is not absolutely required and details, which are not needed for understanding the present invention might have been neglected. Furthermore, elements, which are at least substantially identical or have at least substantially identical functions, are indicated with the same number.
DETAILED DESCRIPTION OF THE INVENTION
In this detailed description, preferred embodiments of the locking plate-screw structure according to the present invention are described only for a better understanding of the subject.
In the plate-screw structure according to the present invention, plate (1) is a rigid structure for keeping the fractured bone fixed. Plate (1) and screw (2) are screwed to each other and a bone fixation system is formed. In this structure, screw head (3) is not screwed to the slot (5) disposed on the plate; screw (2) is initially screwed to the plate (1) (to the screw hole with internal threads (9)). As said screw (1) is rotated, it is screwed to the bone by advancing through the slot formed inside the bone.
In the structure according to the present invention, no threads (7) are provided on the screw head (3). Screwing process starts at the plate (1) and continues inside the bone without interruption. Screw threads (7) and thread pitches (8) consist of a single type, wherein, same distance is covered in the plate (1) and bone at each rotation (turn). When the screw (1) is rotated, advancing thereof inside the bone cannot be prevented, thus, bone protrusions on the screw path inside the bone formed by the screw threads (7) are not damaged.
Engagement of the screws (1) inside the bone depends on the engagement of threads (7) and screw path suitable for these threads (7) formed inside the bones by said threads (7) in a tight and compatible manner. In the plate-screw structure according to the present invention, this screw path formed at the end of the screwing is not damaged in any manner. Since damage to this screw path is not at stake, screw-bone connection becomes much stronger than that of the prior art.
The better the fixation of bone fractures is, the less the number of problems encountered during union thereof. In this case, success rate obtained in the surgical treatment of the bone fractures employing this system becomes higher. In the plate-screw system according to the present invention, the screw (2) immediately engages the bone by being initially screwed to the threads formed on the internally threaded screw hole (9) disposed on the plate (1) and no change in the thread pitches (8) is at stake. Screw (2) is connected to the plate (1) and bone by means of a system having
the same thread pitch (8). Screw (2) can smoothly advance inside the bone until the screw head (3) is seated on the screw head slot (5). Screw head slot (5) is compatible with the screw head (3). Screw head (3) exactly fits in the slot (5) and shape of the slot (5) is identical to the shape of the screw head (3).
In the prior art, "locking plate-screw" structures can be provided in different shapes and structures for the various bones of different areas of the body. However, the common feature of all these structures is that at least two distinct regions having different thread pitches (8) (screw pitch) are provided on the screw (2). One of these regions is screwed to the bone, while the other one is screwed to the plate (1).
The structure according to the present invention can be used in all different types of "locking plate-screw" structures produced for bones located at various parts of the body. In the prior art, aforementioned problems exist in all "locking plate-screw" types, wherein these problems are eliminated by means of the structure according to the present invention. The structure according to the present invention can be used in all "locking plate-screw" systems.
Claims
A locking plate-screw structure used in the orthopedic surgery for fixation and surgical treatment of bone fractures, comprising a plate (1) having a screw head slot (5) for screw head without threads (7) and a screw (2) having a screw head (3) with a screwdriver slot (6) and interconnecting said plate (1) and said screw (2), characterized in that
- said plate (1) comprises an internally threaded screw hole (9) comprising threads (7) having thread pitches (8) same as the thread pitches (8) of the screw body (4).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TR2013/03335 | 2013-03-20 | ||
| TR201303335 | 2013-03-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2014149015A2 true WO2014149015A2 (en) | 2014-09-25 |
| WO2014149015A3 WO2014149015A3 (en) | 2014-11-13 |
Family
ID=50980355
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/TR2014/000085 WO2014149015A2 (en) | 2013-03-20 | 2014-03-19 | Locking plate-screw structure comprising a screw provided without threads on the screw head and locking directly into the screw hole disposed on the plate |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2014149015A2 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7799062B2 (en) * | 2004-11-30 | 2010-09-21 | Stryker Trauma S.A. | Self-guiding threaded fastener |
| FR2910803B1 (en) * | 2006-12-27 | 2009-07-10 | D L P Sarl | OSTEOSYNTHESIS DEVICE COMPRISING A SUPPORT WITH TAPPED ORIFICE ASSOCIATED WITH A PLANAR SUPPORT FOR THE RECEPTION OF AN ANCHORING ROD |
| US8398690B2 (en) * | 2007-02-07 | 2013-03-19 | Apex Biomedical Company, Llc | Rotationally asymmetric bone screw |
-
2014
- 2014-03-19 WO PCT/TR2014/000085 patent/WO2014149015A2/en active Application Filing
Non-Patent Citations (1)
| Title |
|---|
| None |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2014149015A3 (en) | 2014-11-13 |
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