WO2022090811A1

WO2022090811A1 - Hybrid external fixator for alignment correction in fractured bones in lower limb

Info

Publication number: WO2022090811A1
Application number: PCT/IB2021/054830
Authority: WO
Inventors: Behrouz SHAHINFAR
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-11-01
Filing date: 2021-06-02
Publication date: 2022-05-05
Anticipated expiration: 2023-05-01

Abstract

A device for the correct placement of a broken bone in the lower limb, which is combined and extruded. This machine has a hinged part which consists of three main parts and a full thread rod and a curved rod with one thread head. Which is used to make it possible to change the angle of the surface of the horseshoe section to the direction of the rod holding the shins.

Description

Hybrid External Fixator for alignment correction in fractured bones in lower limb

HUMAN NECESSITIES (A)- MEDICAL OR VETERINARY SCIENCE; HYGIENE (A61)- DIAGNOSIS; SURGERY; IDENTIFICATION (A61B)- Surgical instruments, devices or methods, e.g. tourniquets (A61B 17/00)

System and method for an external hip fixator

US10314618

Embodiments of the invention provide a fracture fixation device and method for treatment of a bone fracture. The fracture fixation device includes a main body having a recess formed therein, and a compression element is configured to be received in the recess. The compression element has a passage dimensioned to receive a fracture fixation pin. A compressive force is generated across the bone fracture upon the compression element receiving the fracture fixation pin to promote healing of the bone fracture. The fracture fixation device is an external fixator that provides adjustable aspects of compression, rotation, and length in a simple design that facilitates bone healing by compression.

The above invention is designed for hip and pelvic fractures, the original body of which is oval. The main body and the compression element are configured to connect the fracture fixation device to the subject when repairing a bone fracture. The main body can be made of materials such as aluminum alloy, stainless steel, carbon fiber material or plastic material. The fracture stabilizer consists of a main body in which a recess is formed and a compression element is configured to receive the recess. The compression element has a passage that is provided to receive a fixed fracture base. A compressive force is applied across the bone fracture to the compression element, which receives the fracture fixing pin to heal the bone fracture. However, combined implantation device for proper placement of broken bone in the lower limb, prevention of fractures in the broken bone after recovery and also correction of bone abnormalities in special conditions such as correction of bone length by stretching or compression in the lower limb, ie femur and The leg is. Also, providing the benefits of both Ilizarov equipment and external fixators at the same time is another goal of this equipment that speeds up and facilitates the healing process of broken bones in the lower extremities.

Fracture fixation device, tools and method

US7909825

A bone fixation device is provided with an elongate body having a longitudinal axis and having a flexible state and a rigid state, a plurality of grippers disposed at longitudinally spaced locations of the elongated body, a curved rigid hub connected to the elongated body, and an actuator operably connected to the grippers to deploy the grippers from a first shape to an expanded second shape. Methods of repairing a fracture of a bone are also disclosed. One such method comprising inserting a bone fixation device into an intramedullary space of the bone to place at least a portion of an elongate body of the fixation device in a flexible state on one side of the fracture and at least a portion of a curved rigid hub on another side of the fracture, and operating an actuator to deploy a plurality of grippers of the fixation device to engage an inner surface of the intramedullary space to anchor the fixation device to the bone.

This invention relates to systems for providing reconstructive surgery procedures and devices for bone regeneration and strengthening, including fractures of diseased bones and osteoporosis. The bone fixation device has a flexible elongated structure with a longitudinal axis. The device may also include a mass of receivers located in longitudinal positions along the body, and a rigid curved ball attached to the body and an actuator that is operationally attached to the receivers to remove the receivers from the body. Expand the primary form to the secondary form. To repair a broken bone, a bone stabilizer is placed in the space inside the bone marrow so that the flexible stabilizer is on one side of the fracture and the curved ball is on the other side of the fracture. While the proposed design has the ability to equip both Ilizarov and external fixators at the same time, which accelerates and facilitates the healing process of broken bone in the lower extremities.

Bone transport apparatus for treatment of large segmental defect of femur

CN105476701A

The invention discloses a bone transport apparatus for treatment of large segmental defect of femur. The bone transport apparatus comprises a main intramedullary nail, a fixation support, a plurality of set screws and a plurality of transport needles. The intramedullary nail used for being driven into bones axially is linear and is provided with lock holes at two ends, and the lock holes are matched with general set screws. Two ends of the main intramedullary nail are provided with set screw holes. The lock holes and the set screw holes are formed in the same plane. Rear ends of the set screws are connected with the fixation support while front ends of the set screws are matched and connected with the set screw holes in the main intramedullary nail. The transport needles, with one ends being implanted into bones needing transport and the other ends being connected with the fixation support, are capable of moving along the axial direction of the main intramedullary nail. The device is designed to treat segmental femoral defects.

Orthopedic fixation systems and methods

US9265528B2

The invention provides an orthopedic external fixation system for treatment of lower and upper extremities fractures. The system comprises an elongate base rail supported by a stand structure and a plurality of open rings slid ably and removable coupled to the base rail along the base rail length. The ring members are connected to struts that support flag members, which support wires and pins that interact with the fractured bones for fixation of their positions relative to the rings during treatment. The system has means for combining the rings into separate modules that can be moved relative to each other. Through the use of the struts the rings can be bound into an integral system that can be disconnected from the base and the stand structure, while remains in a working position on the injured limb of the patient.

The above patent system refers to two main components: an initial stabilization device and a base station. The initial fixation device usually consists of a stretched base rail with one or more bone interface pieces or components located along the rail that provide the ability to adjust or reduce fractures. The main fixing device has the ability to move one or more loops that are slidably connected to the base rail along its length. The components of this invention include bone interface components that can be used to connect bones, such as fixing or lowering. The design presented by me has the ability to change the angle and alignment of broken bone parts and is equipped with a hinge with three degrees of freedom, which makes it possible to easily correct angles

The hybrid extrusion device for the correct placement of the broken bone in the lower limb is a device for external fixation of the broken bone with the possibility of placing the direction and angle at the fracture site after placement and surgery. The functional area of this device is the area of medical equipment related to the treatment of bone fractures. The advantages of this device are that without the need for readmission, the patient endures double pain and imposes heavy costs of reoperation or complications of anesthesia drugs, can correct possible bone abnormalities after initial surgery, and installation of equipment on the patient's lower limb bone. This device simultaneously brings the advantages and capabilities of the two Schanz screw and clamp systems as well as the external Ilizarov fixator for both the patient and the doctor. This equipment can be used in orthopedic wards and related hospital wards.

Bone fractures are one of the treatable consequences of severe collisions, including road accidents. But the type of bone fusion and the completeness of the treatment depends on the proper placement of the two bone surfaces with the most friction next to each other. Depending on the type and condition of the fracture, different fixation methods are selected, including surgical and non-surgical casting or surgery with internal fixation equipment (inside the skin) and extracutaneous fixation equipment. Bone fractures are divided into two general categories, open and closed. An open fracture means that the surface of the skin opens and blood comes out and the underlying layers of the skin or bone are exposed to air and infection. A closed fracture means that the bone breaks as a result of an accident, but no effective cracks or cuts occur on the surface of the skin. In open fractures, various external fixators available in the market are generally used to prevent infection.

Sometimes it happens that after the stabilization operation, the alignment and the natural shape of the bone (alignment) are not created and a few degrees, angle, or rotation is observed between the two broken pieces. Sometimes in a fracture of an open or closed bone, one of the two or more broken pieces or several pieces, especially in cases of fractures close to the joints, is so small and short that it is not possible to keep it fixed and it is necessary to have a device with the ability to place bone (reduction) for treatment. Therefore, the existence of a suitable fixator device for correction of the alignment is very important due to the complications of reoperation of surgeries such as pain re-tolerance, fixation conditions, exorbitant costs, and possible complications of the operation. The purpose of making a hybrid extrusion device for proper placement of a broken bone in the lower limb, prevention of abnormalities in broken bones after recovery as well as correction of bone abnormalities under certain conditions likes correcting the length of a bone by stretching or compressing it in the lower limb, ie the femur and leg. Also, providing the benefits of both Ilizarov equipment and external fixators at the same time is another goal of this equipment that accelerates and facilitates the healing process of broken bones in the lower extremities.

Solution of problem

The present invention is a hybrid extrusion device for the correct placement of a broken bone in the lower limb (Fig1), consisting of 3 sections of Schanz and rod (A), a hinge with three degrees of freedom and attachments (B), and a set of arches of

(C). First, by making holes with a drill on the femur or the great straw of the leg, the points of establishment and screwing of the shins (1) are created and the shins (1) are screwed in the created places. Then, using double clamps (a.f. clamp) (2), the shins (1) are connected to the main rods (3). The main rods (3) are screwed in the direction of the injured bone head to the first piece of a hinge with three degrees of freedom (4) and locked in place by a simple nut (15). The second piece of a hinge with three degrees of freedom (5), which is similar to the first piece (4), is connected to the ring of the first piece (4) through its end screw and a simple nut (15)

The third piece of a hinge with three degrees of freedom (6) through its ring with the help of a simple screw (16) and a simple nut (15), to the second piece (5) and through the bell thread and with the help of a simple nut ( 15) connected to a whole thread rod (7). The other end of the all-thread rod (7) is placed inside one of the

(8) arc holes according to the bone fracture condition and diagnosis of the orthopedic specialist and is fixed by two simple beads (15) on both sides of the arch

.

The bony parts of the damaged bone head are connected to the two arches

(8) by grooved screws (11) by drilling holes on the mentioned bone parts and using simple pins (9) and appendage pins (10). In the present equipment (FIG1), depending on the treatment needs, two arches

(8) are connected by three long nuts (12) of equal size, and simple screws (16) at a certain distance from each other, with zero degrees of freedom. To change the angle of the set of arches

(C), two curved rods (13) are used, the threaded head of which is made using two nuts (15) into one of the holes of the arc

(8) and the simple end is connected to the main rods (3) using a curved rod clamp (14).

This type of connection allows the correction of the angle of the broken parts of the bone head or the application of pressure or tension on the bone with the help of a set of hinges with three degrees of freedom (B) and all-thread rods (7). After adjusting each part, the corresponding degrees of freedom are taken with a simple nut (15) or a simple bolt (15 and 16). To change the angle between the surface of the arc

(C) and the direction of the main rods (3), it is enough to adjust the curved rod clamp (14), the hinge joints with three degrees of freedom (B), and the full thread rod (7) and in this process, there is no change in the installation of shins (1), simple pins (9) and additional pins (10).

If, after surgery and during diagnostic procedures, it is found that there is a problem with the alignment or shortening and height of the restored bone with the combined extraction device for proper placement of the broken bone in the lower limb (Fig1), using a change in the position of the arches

, the angle correction operation or stretching and pressure on the target bone will be performed without the need for re-surgery or breaking the improperly welded area. The free part in the arc

(C) allows the joint to bend close to the fractured area. Due to the same size of screws (16) and nuts (15) used to stabilize the joints of the device, with only two wrenches of the same size as the bolts and nuts, the process of changing angles can be done.

Advantage effects of invention

Reduce the recovery time of damaged bone;

Ease of aligning broken bones after surgery and installation of the device;

Reduce the risk of infection in open fractures;

Currency savings by preventing the import of similar foreign samples and at the same time having more benefits;

Having the simultaneous advantage of Elizarov rod and Shenzskro and external fixator;

Relatively simple installation in terms of efficiency range;

Easier disassembly of the device after complete fracture healing than implants;

Prevention of double pain to the patient when correcting fractures of fractured bones;

Providing this device at a lower cost for orthopedic specialists than similar foreign samples;

Ease of working with the device according to the design of the components;

Ease of carrying the device installed on the patient's limb due to the use of

ring

Creating entrepreneurship in the process of mass production of devices;

Having a competitive advantage to export the device;

One hundred percent indigenousness from the design and construction stage to the supply of ingredients;

No need for readmission to correct possible postoperative bone abnormalities;

Equipped with a hinge with three degrees of freedom that makes it possible to easily correct angles;

Prevention of foot drop during treatment;

Quick installation of Shanks and curved rods due to the design of the respective clamps and reduction of operating time;

Increasing the percentage of satisfaction of the operation for the patient due to the possibility of corrective changes without surgery and readmission and tolerance of possible complications caused by anesthesia drugs.

: Overview of Hybrid External Fixator for alignment correction in fractured bones in lower limb

: front view of Hybrid External Fixator for alignment correction in fractured bones in lower limb

: left view of Hybrid External Fixator for alignment correction in fractured bones in lower limb

: isometric view of Hybrid External Fixator for alignment correction in fractured bones in lower limb

: top view of Hybrid External Fixator for alignment correction in fractured bones in lower limb

: 1. shin 2. Double clamps (af clamp) 3. Main rods 4. The first piece of hinge with three degrees of freedom 5. The second piece of hinge with three degrees of freedom 6. The third piece of hinge with three degrees of freedom 7. The whole rod thread 8. Arc

9. Simple pins 10. Appendix pins 11. Grooved screws 12. Three long nuts 13. Two curved rods

9. Simple pins 10. Appendix pins 11. Grooved screws 12. Three long nuts 13. Two curved rods 14.Rod clamp bent

: 10. Appendix pins 11. Grooved screws 15,16. Simple bolts

: 8. Arc

9. Simple pins 10. Appendix pins 11. Grooved screws

Examples

The patented device is used to treat and correct fractures and bone abnormalities in the lower extremities in related hospital wards.

Orthopedic wards of hospitals;

Emergency surgical wards;

Private offices of orthopedic specialists;

Accident and burn hospitals.

Claims

It is a hinged part with three degrees of freedom, which consists of three main parts and a full threaded rod, and a curved rod with one threaded end. And is used to make it possible to change the angle of the surface of the horseshoe section relative to the rod holding the shins.
According to Claim 1, the first piece of a hinge with three degrees of freedom is a self-tapping screw that is screwed into a rod holding the bolts and secured with a nut. And its ring head is connected with a screw of a similar piece and is fastened with a simple washer and a nut.
According to Claims 1 and 2, the third piece of a hinge with three degrees of freedom, which has a bell thread, is connected to the rod of the whole thread by a bolt with the second piece from the bell side using a simple nut.
According to claim 1, the curved rod is connected from the threaded head side by two nuts near the free end of the first horseshoe-shaped ring and its simple end is connected to the shin support rod by a special clamp.