BRPI0904658A2 - polyaxial and monoaxial pedicle screw - Google Patents

Abstract

POLIAXIAL AND MONOAXIAL PEDICUT-LAR SCREW, intended for surgical procedures in the pathologies of thoracic, lumbar and sacral spine instabilities, comprises characteristics developed in the joint where the head (4) of the polyaxial screw (100) is coupled through the ring (10 ) in the warhead (20) which allows limited rotation and axial movements, facilitating the handling in the procedure and after performed, the surgeon breaks part of the warhead, reducing the discomfort of the dimensions of the joint and increasing the patient's recovery efficiency. It is still in the shape of the walls (21) (22) of the screw (300), monoaxial.

Description

DESCRIPTIVE REPORT OF INVENTION PATENT

"POLIAXIAL AND MONOAXIAL PEDICULAR SCREW"

The present patent application describes and claims in this report an inventive solution with the field of application directed to surgical procedures in the pathologies of thoracic, lumbar and sacral spine instabilities, translated as a set of emonoaxial polyaxial pedicle screws, bars and hooks. "cross link" forming a fastening system whose construction brings in its core a series of technical advantages, unprecedented and innovative.

Pedicular screws found in the technical state intended for surgical procedures require difficult maneuvers to position and anchor said screws. The fixation system implanted in the patient's spine becomes painful and uncomfortable, as there is not enough flexibility, so it is necessary to position the fixation system completely.

Another problem with pedicle screws is that the existing format makes it difficult to handle tools intended for application. This in the patient causes bleeding and injury, prolonging recovery time and making the postoperative period uncomfortable and painful.

The proposed pedicle screw allows radial movements with limiter, which facilitates surgical procedures and provides postoperative comfort.

In addition to the present description in order to gain a better understanding of the features of the present application, attached hereto is a set of drawings, in which, by way of example, a limiting embodiment, an embodiment of the "POLYXIAL AND MONOAXIAL PEDICULAR SCREW" "claimed, where:

Figure 1 is a representation of the spinal defixing system utilizing the component with pedicle screw, upper warhead, nut, transverse rod, parallel rod and locking guide assembly;

Figure 2 is a perspective representation of the polyaxial pedicle screw;

Figure 3 is a side sectional representation of the polyaxial pedicle screw;

Figure 4 is a representation of detail A-A of the polyaxial pedicle screw;

Figure 5 is a side view of the polyaxial pedicle screw;

Figure 6 is a side sectional representation of the polyaxial pedicle screw, ring and warhead;

Figure 7 is a side view of the polyaxial pedicle screw, ring and warhead;

Figure 8 is a front view of the polyaxial pedicle screw, ring and warhead;

Figure 9 is a bottom representation of the polyaxial pedicle screw, ring and warhead;

Figure 10 is a top view of the polyaxial pedicle screw, ring and warhead;

Figure 11 is a side sectional representation of the monaxial pedicle screw and warhead;

Figure 12 is a front view of the monaxial pedicle screw and warhead;

Figure 13 is a perspective view of the nut of the polyaxial and monoaxial screw system;

Figure 14 is a side sectional representation of the polyaxial and monoaxial screw system nut Figure 15 is a top representation of the polyaxial and monoaxial screw system nut;

Figure 16 is a side view of the polyaxial and monoaxial screw system nut

DETAILED DESCRIPTION

The following detailed description should be read and interpreted with reference to the drawings presented, where these are highly diagrammatic, representing an embodiment of the "EMONOXIAL POLYXIAL PEDICULAR SCREW" and are not intended to limit the scope of the invention, which is limited only to that set out in the fourth claim.

The "POLIAXIAL AND MONOAXIAL PEDICULAR SCREW" is intended for surgical procedures in the pathologies of thoracic, lumbar and sacral spine instabilities, translated as a set of polyaxial (100) or monaxial pedicle screws, transverse rod (30), parallel rod (40) and hooks. (50) cross link forming a fastening system.

The invention comprises screw (100), support ring (10), upper warhead (20), transverse rod (30), parallel rod (40), hooks (50) and lock nut (60);

In a preferred embodiment of the invention it forms a fastening system where the screw (100) is inserted into the upper warhead (20) with the head (4) of the screw (100) free with radial and axial movements limited by the warhead walls (21) (22) (20), the ring (10) prevents the screw (100) from being pulled out of the warhead (20). Above the warhead (20) the transverse rod (30) runs through the channel (200) formed by the shape of the warhead (20), and the transverse rod (30) allows adjustment in the distance between the screws (10). The warhead (20) comprises an internal thread that receives a locking nut (60) from the warhead assembly (20), transverse rod (30) and screw (100).

As a parallel spacing adjustment, the system comprises a parallel rod (40) passing through two opposing hooks (50) with lower projection (51) and central locking nut (52). The hooks (50) are formed by a flat upper (53) and outer extremities (54) formed by an orthogonal projection and two lower parallel teeth (55) (56);

The polyaxial pedicle screw comprises a screw (100) with the cylindrical body containing a thread (2) formed by an exponential curvilinear transverse projection (2A) in the lower portion of the thread (2) and an orthogonal transverse projection (2B) in the upper portion, both of which the projections extend to the darosca crest and orthogonally and form a flat, narrow surface (2C); one end of the screw has a conical format with a longitudinal section (3) with an edge at the center diameter of the screw body (100); the opposite end composes the head (4) of the screw (100) being an upper portion through a concentric cross section of larger diameter formed from the extension of the bolt body (100) extending an angled lower surface (5) with an outer arch, followed by an Conversion at the opposite angle that makes up the curved, rounded lateral face (6) of the head (4) provides axial and radial movements. The upper face (7) of the head comprises a narrow contour edge following a tapered slope (7A) towards the center of the head (4) from the screw (100) through which emerges the central section (8) concentric with the curvilinear and upper upper outer face (8A) orthogonal. The concentric section (8) has a hexagonal central hole (9) that receives the engagement of an application key.

The upper support ring (10) coupling the screw (4) to the upper warhead (20) longitudinally, whereby the lower angular surface (5) of the head (4) of the screw (100) is in contact with the lower end (IOA) , smaller in diameter than the screw head (4) and keeps the screw attached to the ring (10); Inner lower portion of ring (10) has curvilinear shape (11) of internal cavity compatible with head (4) concentric section (4) of screw (100). Rigid inner section (12) Inclined tapered cross-section (12A) compatible with the incline (7A) of the screw head (4) (100). The inclination variation of the tapered edge (12A) of the ring (10) together with the tapered slope (7A) of the screw head (4) (100) defines the screw axial actuation angle (100).

The upper warhead (20) comprises two opposing symmetrical parallel walls (21) (22) whose inner sides (23) have a female thread and outer sides with a first transverse flat surface (24), a second concave surface (25) in recess and a third transverse planar surface (26) wherein the three surfaces form parallel parallel walls (21) (22). A hole (27) located in the lower portion of the walls aligned with a three-way vertical circle-shaped cavity (28), being the central diameter of the largest diameter. Still in the upper warhead (20), an upper portion comprises an inclined cut (29) which allows the breaking of part of the warhead body (20), after the screw (100) is implanted, thereby the upper warhead body (20) is reduced. and enables a more efficient recovery of the patient and reduces the discomfort caused by the set.

When viewed laterally, the warhead (20) has a channel (200) formed by the symmetrical walls (21) (22) that receive a transverse rod (30) that deflects the pedicular system.

The upper female internal warhead thread (20) receives a cross-stem clamping nut (60) with the upper warhead (20).

The upper support ring (10) coupled to the head (4) of the screw (100) enables the radial and axial movements of the screw.

In one embodiment of the invention the warhead (20) composes the rigid extension of the bolt body (300) through a neck (500) forming a single monoaxial part. In this embodiment the upper warhead (20) comprises two opposing symmetrical parallel walls (21) (22) whose internal sides (23) have a female thread and external sides with a first transverse flat surface (24), a second concave surface (25) in recess and a third transverse planar surface (26) wherein the three surfaces form parallel parallel walls (21) (22). A cavity (28) in the shape of three vertical circumferences, the central circumference being the largest in diameter. Still in the upper warhead (20), an upper portion comprises an inclined section (29) which allows the braking after implantation of the screw (300), thus the upper warhead (200) body is reduced and enables a more efficient patient recovery and decreases the discomfort. When viewed laterally, the warhead has a channel (200) formed by the symmetrical walls (21) (22) that receive a transverse shank (30) securing the system.

The upper female internal warhead thread (20) receives a transverse rod clamping male nut (60) with the upper warhead (20).

The nut (60) has the upper and lower convex face, that is, they are curvilinear or rounded faces. The center of the nut (60) comprises a cavity with semicircular chisels receiving a similar wrench for effective tightening. The nut has on the sides a male thread (62) for threading inside the warhead (20).

Therefore, the innovation, which allows the advancement of the fixation system, for surgical procedures of pedicle screw implants in the column consists of the characteristics developed in the set where the head (4) of the polyaxial screw (100) is coupled by the ring (10) in the warhead. (20) which allows rotation in limited axial movements, facilitating procedure handling and, once performed, the surgeon breaks part of the mouth, promoting the reduction of joint discomfort and increasing the efficiency of patient recovery. Also in the shape of the walls (21) (22) of the screw (300), monoaxial.

The embodiment described in this constructive detail topic is provided by way of example only. Changes, modifications, and variations may be made for any other particular constructive embodiment by those skilled in the art, however, departing from the objective disclosed in the patent application, which is uniquely defined by the appended claims. It is verified by what has been described and illustrated that " POLYAXIAL AND MONOAXIAL PEDICULAR SCREW "claimed and complies with the rules governing the Patent of Invention under the Industrial Property Law, deserving for that reason and consequently the respective privilege.

Claims (8)

1.) "POLYXIAL PEDICULAR SCREW", intended for surgical procedures in the pathologies of the columbatoracic, lumbar and sacral instabilities, CHARACTERIZED BY the fact that screw (100) with one end composing the head (4) of screw (100) being an upper portion through a larger concentric cross-section formed from the extension of the bolt body (100) extending to an externally bending lower surface (5), followed by an opposite angled conversion that forms the curved, rounded lateral face (6) of the head ( 4) providing axial and radial movements; upper face (7) of the head comprises a narrow contour edge following a tapered slope (7A) towards the center of the head (4) from the screw (100) through which emerges the central section (8) concentric with the curved outer face (8A) and orthogonal upper bevel ; The concentric section (8) has a hexagonal central hole (9) which receives the engagement of an application key - the upper support ring (10) coupling the screw (4) to the upper warhead (20) longitudinally over the lower angular surface ( 5) the head (4) of the screw (100) is in contact with the lower end (10A), smaller in diameter than the head of the screw (4) and keeps the screw attached to the ring (10); nut (60) has the face convex superior and inferior, that is, they are curvilinear or rounded faces. The center of the nut (60) comprises a socket with five semicircular sides receiving a similar wrench for effective tightening, the nut has on the sides a male thread (62) for tapping inside the knife (20) .- upper warhead (20) comprises two walls ( 21) (22) opposing symmetrical parallels whose inner sides (23) have a female thread and outer sides with a first transverse flat surface (24), a second concave recess surface (25) and a third transverse flat surface (26) with the three surfaces form the parallelessymmetric walls (21) (22). 2.) "POLYXIAL PEDICULAR SCREW" according to claim 1, CHARACTERIZED BY Lower portion internally ring (10) has curvilinear shape (11) of the inner cavity compatible with the concentric section (6) of the screw head (4) (100) ; rigid inner section (12) with angled tapered edge (12A) compatible with the tapered slope (7A) of the screw head (4) (100); having the angular variation of inclination of the tapered edge (12A) of the ring (10) in conjunction with the tapered slope (7A) of the head (4) of the screw (100) defines the axial actuation angle of the screw (100). 3.) "POLYXIAL PEDICULAR SCREW" according to claim 1, characterized by a screw (100) with a cylindrical body containing a thread (2) formed by an exponential curvilinear transverse projection (2A) in the lower portion of the thread (2) and a transverse projection orthogonal (2B) in the upper portion, both projections extending to the crest of the thread and orthogonally and forming a flat and narrow surface (2C); one end of the screw is conical in shape with a longitudinal section (3) with an edge in the center of the diameter of the screw body (100); 4.) "POLYXIAL PEDICULAR SCREW" according to claim 1, characterized by lateral walls (21) (22) of the warhead (20) containing a hole (27) located in the lower section of the walls aligned with a shaped cavity (28) of three vertical circumferences side by side, the largest circumference being still larger in the upper diameter (20), an upper portion comprises an inclined cut (29) which allows part of the body of the warhead (20) to be broken after implantation of the screw (100), as the body of the upper warhead (20) is reduced and enables a more efficient recovery of the patient and reduces the discomfort caused by the joint; The warhead (20) has a channel (200) formed by the symmetrical walls (21) (22) which receive a transverse rod (30) for fixing the pedicular system. 5.) "MONOAXIAL PEDICULAR SCREW", intended for surgical procedures in the pathologies of columnar, lumbar and sacral instability, CHARACTERIZED BY the fact that the sling (20) comprises the rigid extension of the screw body (300) through a neck (500) forming a single piece monoaxial. 6.) "MONOAXIAL PEDICULAR SCREW" according to claim 5, FEATURED BY Upper head (20) The screw (300) comprises two opposing parallel-parallel walls (21) (22) whose inner sides (23) have a female thread and outer sides with a first transverse planar surface (24), a second recessed concave surface (25) and a third transverse planar surface (26) with the three surfaces forming symmetrical parallel walls (21) (22); a cavity (28) with the shape of three vertical circumferences being the central circumference of larger diameter; further in the upper warhead (20), an upper portion comprises an inclined cut (29) which allows breakage after implantation of the screw (300); inner female upper warhead thread (20) receives a male (60) with cross-stem clamping male thread with the upper warhead (20). 7.) "POLYXIAL PEDICULAR SCREW" according to claim 1, characterized by a fastening system where the screw (100) is inserted into the upper warhead (20) leaving the screw (100) free with radial and axial movements limited by the walls ( 21) (22) of the warhead (20), the ring (10) prevents the removal of the screw (100) from the warhead (20); above the warhead (20) the transverse rod (30) passes through the channel (200) formed by the shape of the warhead (20), and the transverse rod (30) permits adjustment of the distance between the screws (10); warhead (20) comprises an internal thread that receives a locking nut (60) from the warhead assembly (20), transverse rod (30) and screw (100); Parallel spacing comprises a parallel rod (40) running through two hooks (50) disposed in opposition with lower projection (51) and central clamping (52). 8.) "POLYXIAL PEDICULAR SCREW" according to claims 1 or 8, FEATURES BY HOOKS (50) ARE FORMED BY A FLAT TOP (53) AND EXTERNAL EXTENSIONS (54) FORMED BY AN Orthogonal PROJECT AND TWO TEETH (55) (56) inferior parallels with each other;