BRPI0805421A2 - pedicular screw, respective system and other components for cementing pedicular screw in bone structures - Google Patents

Abstract

comprising pedicular screw (1), hollow and threaded upper section (2), hexagonal platform (3), cylindrical section (4), worm threaded extension (5), flow holes (6), initiation canal for wire insertion metal guide (7), torque shafts (8), cannula nozzles (9) (10) for cement insertion via injection syringe (11) into a bone perforation (12), which will receive a screw; ); said cementation system provides for the steps of: a first bone perforation - (a), cavity enlargement - (b), cavity cleaning - (c); internal thread forming in the cavity - (d), insertion of the pedicular screw (1) with the metallic guide wire (7) - (e), cannula coupling (10) - (f), cement insertion through the cannula and inner canal pedicular screw - (g) into the bone cavity, via injection syringe (11), removal of the pedicular screw - (h) and placement of the definitive screw (13) - (i).

Description

"PEDICULAR SCREW, RESPECTIVOSYSTEM AND OTHER COMPONENTS FOR PEDICULAR SCREW CEILING IN BONE STRUCTURES"

The present patent application deals with the development of a system for cementing bone structure screws, where for a better understanding of the components and procedures comprising the present invention, its application to the vertebral column will be described by way of example.

As is known primarily by those skilled in the art, fixing the spine with pedicle screws is a safe, effective and universally accepted procedure.

However, it is known that osteoporosis is an important factor that delimits its use, usually due to the early release of implants and their failure to fix them.

The state of the art reveals the application of polymethylmethacrylate bone decay in the fixation of screw screws, bringing relevant benefits, and several studies and studies show improvement of the results in both initial pullout strength and fatigue loosening resistance.

In this same aspect and based on the information explained, it was envisaged the development of an even safer, highly effective and simplified system for the cementation of pedicular screws in the osteoporotic spine, also eliminating the need for modifications to the implants that may already exist, which certainly would weaken and possible loss of efficiency of these implants.

Thus, the present innovation consists of a set composed of a pedicular screw, preferably made of resistant plastic material, of cannulated shape and provided with holes in a circular way in its distal portion, having, in the proximal part, a thread adaptable to a cannula and syringe system. For cement injection, that is, as this screw is the same as the screw to be cemented, it will create a cement shell in the shape of the definitive implant after the cement injection. Before it hardens, the injection screw is removed and the definitive screw is placed into a mass of bone cement. Once the plastic screw is cannulated, a metal guidewire is inserted with it to control the scope to have certainty of the cementation position.

It is noteworthy that the object of the present application described and innovated has widespread application and can be used in any and all existing systems on the market, simply producing the plastic injection screw with thread and diameter similar to the screw to be implanted.

In this sense and aiming at a better understanding of this innovation, as well as its technical, practical, constructive and functional characteristics, drawings are presented, to which references will be made, together with the following detailed description, where:

Figure 1 illustrates the bone structure perforation procedure, in this case, a segment of the spine;

Figure 2 illustrates a next step of bore widening;

Figure 3 illustrates a step of cleaning the perforated cavity;

Figure 4 shows the step of internal thread forming on the walls of the perforated cavity Figure 5 illustrates the pedicular screw made of sturdy, cannulated, plastic with holes;

Figure 6 illustrates the pedicular screw receiving the metallic guide wire for radioscopic control, used to determine the cementation position;

Figure 7 shows an axis adaptable to the upper region of the pedicular screw, which will thread it, together with the metallic guide guide, into the perforated bone cavity;

Figure 8 illustrates said axis coupled to the upper regions of the pedicular screw;

Figure 9 illustrates the threading of the screw in the bone cavity through the coupled shaft in the upper region, with the metallic guide wire inside;

Figure 10 illustrates, in radiographic view, the insertion of the metallic guidewire into the bone cavity;

Figure 11 illustrates, also in radiographic view, the metallic wire positioned inside the cavity that will be cemented to receive the definitive screw;

Figure 12 illustrates the cannula coupling in the threaded upper areas of the pedicular screw;

Figure 13 shows the cannula coupled to the screw, at which opposite end is attached the syringe containing the cement that will be injected into the cavity, dispersing through the lower holes present in said screw;

Figure 14 illustrates in radiographic view the cementum dispersed within the bone cavity;

Figure 15 illustrates the threaded insertion of the definitive screw after removal of the pedicular screw;

Figure 16 illustrates the removal of the insertion axis after the total screwing of the definitive screw in the cemented bone cavity; and,

Figure 17 illustrates a top view of the definitive screw already installed in the cemented bone cavity.

In accordance with the said illustrations, and in accordance with the description presented herein, the present patent application refers to a pedicular screw, respective system and other components for cementation of the screw in the bone structures, comprising a screw-screw (1) provided with an upper portion. threaded and threaded (2) on a hexagonal platform (3) followed by cylindrical section (4), with endless threaded extension (5), provided inferiorly with hollow holes (6), said screw providing internal channel for insertion of metal wire (7) ), and in the upper threaded section (2) can be coupled torque shafts (8), cannulae (9) for cement insertion (10) via injection syringe (11) in a bony perforation (12), which will receive a screw definitive (13).

This cementation system provides the steps of: a first bone drilling - (a), cavity enlargement - (b), cavity cleaning - (c); internal thread forming - (d), pedicular screw insertion (1) with guidewire (7) - (e), cannula coupling (10) - (f), cannula insertion and pedicular screw inner canal - (g) bone cavity via injection syringe (11), removal of the pedicular screw - (h) and placement of the definitive screw (13) - (i).

It should be noted that while the present application has been described with reference to the intended embodiment, it will be apparent to those skilled in the art that further modifications may be made, including with regard to the use of varied materials, shapes, parameters and dimensions, such features being, properly covered in the present innovation, without departing from the spirit and scope of the claim.

In the light of all the foregoing and duly illustrated, it is to be understood that the present patent application for a pedicular screw, its component edema system and for pedicle screw cementation in bone structures is extremely simple in its design, and therefore easy feasibility, low cost and excellent practical and functional results, bringing together the essential requirements of novelty, inventive activity and industrial application, making them totally worthy of the privilege required.

Claims (2)

1.- "PEDICULAR SCREW, RESPECTIVOSYSTEM AND OTHER COMPONENTS FOR CEMENT OF PEDICULAR SCREWING IN BONE STRUCTURES" - characterized by the fact that it comprises a pedicular screw (1) with a hollow and threaded upper section (2) on a hexagonal platform (3) followed by cylindrical (4), with endless threaded extension (5), provided inferiorly with hollow holes (6), said screw providing internal channel for insertion of metallic guidewire (7), and in the upper threaded section (2) can be coupled axes of torque (8), cannulae nozzles (9) (10) for cement insertion via injection syringe (11) into a bony perforation (12), which will receive a definitive screw (13). 2. - SYSTEM AND OTHER COMPONENTS FOR PEDICULAR SCREW CEMENT OF BONE STRUCTURES "- said cementation system characterized by the fact that it provides the steps of: a first bone drilling - (a), cavity enlargement - (b), cavity cleaning - (c); conformation of the internal thread in the cavity - (d), insertion of the pedicular screw (1) with the metallic guidewire (7) - (e), cannula coupling (10) - (f), insertion of the cement by the internal ecanal cannula of the pedicular screw - (g) in the injection cavity bone cavity (11), removal of the pedicular screw - (h) and definitive screw replacement (13) - (i).