CN102525626A

CN102525626A - Vertebral arch pedicle screw system capable of being embedded with minimal invasion

Info

Publication number: CN102525626A
Application number: CN2012100263099A
Authority: CN
Inventors: 陈远明
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-02-07
Filing date: 2012-02-07
Publication date: 2012-07-04
Anticipated expiration: 2032-02-07
Also published as: CN102525626B

Abstract

The invention discloses a vertebral arch pedicle screw system capable of being embedded with minimal invasion, which comprises at least two screw seats (5) with round section. Each screw seat (5) is provided with a guider composed of two half guiders (1) which are symmetrically arranged on the outer walls of two sides of a U-shaped groove (5-2) on the screw seat (5), the middle of each half guider (1) is an arc plate (2) identical with the outer wall of the screw seat (5), the arc length of the arc plate is equal to the arc length on lateral outer wall of the U-shaped groove (5-2). Guide wings (3) are positioned at two ends of the arc plate (3), the end of the arc plate (2) in the middle of each half guider extends towards the outer side of the arc plate (2) to form the guide wing (3), two protrusions (4) parallel to the generatrix of the arc plate (2) are arranged on the inner wall of the arc plate (2) of each half guider (1), and location grooves (5-1) for the protrusions (4) to be inserted into are respectively and correspondingly positioned on the outer walls of two sides of the U-shaped groove (5-2) of each screw seat (5).

Description

But the pedicle screw system that a kind of Wicresoft inserts

Technical field

The present invention relates to a kind of medical science surgical instruments, be specifically related to a kind of spinal column internal fixation device, this holder is applicable to the Minimally Invasive Surgery of internal fixation of spine.

Background technology

The spinal segments shakiness that lumbar vertebra fracture causes, sclerite or disc tissue displacement can be oppressed dural sac or nerve root, cause nervous symptoms.With patient nervous symptoms or that fracture compression is heavier, often need operative treatment.The purpose of operative treatment is stabilizing spine, recovers height and the spinal canal decompression of vertebral body that subduction is to the compressing of nerve.Classical at present modus operandi is that way of escape pedicle adopts the excellent pedicle screw system of nail to carry out strong internal fixation; The excellent pedicle screw system of described nail is that circular nail seat, hold-down bars and plug screw constitutes by pedicle screw, cross section mainly; Wherein, Pedicle screw is located at of nail seat, and the nail rod is located in the U type groove of nail seat other end, and is compressed by described plug screw.During operation, earlier pedicle screw is implanted in the vertebral body, and then hold-down bars is packed in the U type groove of nail seat, with plug screw hold-down bars is compressed at last.Traditional nail process of planting adopts open surgery, and hold-down bars snaps in the U type groove from nail seat end in the operation process; In addition, the x-ray fluoroscopy that also is employed in C type arm at present adopts the mode of Wicresoft's (percutaneous) to plant nail down, and the hold-down bars of this modus operandi needs to pass through from hypodermic tunnel earlier; Side direction from the nail seat penetrates in the U type groove then; Yet,, must hold-down bars be aimed at U type groove exactly and could insert from side direction smoothly because the diameter of the width of described U type groove and hold-down bars is suitable; The hold-down bars mounting hardness is high, particularly during the spinal fixation of a plurality of sections.

Summary of the invention

But the technical problem that the present invention will solve provides the nail rod pedicle screw system that a kind of Wicresoft inserts, this system when adopting Minimally Invasive Surgery to plant nail, hold-down bars easy for installation.

The technical scheme that the present invention solves the problems of the technologies described above is:

But the nail that a kind of Wicresoft inserts rod pedicle screw system, this system has two cross sections at least for circular nail seat, it is characterized in that,

Each nail seat is provided with a guider, and this guider is made up of two and half guiders; Described two halves guider symmetry is located on the outer wall of the U type groove both sides that wear hold-down bars on the nail seat; Each half guider is made up of more than or equal to successive three sections of U type groove depth height; The middle part is one section arc plate that matches with nail seat outer wall; Its arc length equates that with the arc length of said U type groove one side outer wall two is a guide vane, and this guide vane is extended to form to the outside of arc plate by the end of the arc plate at middle part; It is orthogonal convexity with the institute parallel cross section of arc plate bus respectively that the inwall of the arc plate at the middle part of described half guider is provided with two, and the radial centre lines of each convex cross section all meets at the axis of said nail seat;

Correspondingly be provided with two locating slots that insert set two convexities on described half guider on the outer wall of the U type groove both sides of described nail seat respectively, to extending below, its development length equals the height of said half guider to this locating slot by the upper surface of following closely seat.

But the nail that Wicresoft of the present invention inserts rod pedicle screw system, wherein, described guide vane can be rectilinear, also can be arcual, when it when being arcual, its arch towards with said circular arc plate arch towards on the contrary.

But the nail that Wicresoft of the present invention inserts rod pedicle screw system; Wherein, passable successive of described convexity also can be interrupted, when it is when being interrupted; Preferably form by two sections; And be located at the top edge and the lower limb of said arc plate inwall respectively,, improve locating effect with the length of fit of increase with said locating slot.

But the nail that Wicresoft of the present invention inserts rod pedicle screw system; Just synthetic complete guider after wherein said two halves guider inserts the nail seat to go up set locating slot; This guider forms a horn mouth respectively at two of the U type groove of nail seat; This horn mouth has good guiding function, even blind inserting also can get into hold-down bars in the U type groove of next nail seat in the U type groove of a nail seat smoothly.Therefore but the nail rod pedicle screw system inserted of Wicresoft of the present invention is specially adapted to the Minimally Invasive Surgery of internal fixation of spine; Can be in the operation with hold-down bars from successfully wearing to the U type groove of next nail seat through subcutaneous in the U type groove of a nail seat; Operating time can be practiced thrift, the operation quality can be improved again.In addition; The present invention utilizes the cross section of said nail seat to be circular this architectural feature; Make location structure that said convexity and locating slot constituted radially, limited two degree of freedom of each half guider in nail seat cross section dexterously, how holder is pushed localizer at said guide vane and can not broken away from from the nail seat during planting-peg; But said guider then can load and unload very convenient along the axis direction freely-movable of nail seat.

Description of drawings

The structural representation of an embodiment of the nail rod pedicle screw system that but Fig. 1 is a Wicresoft of the present invention to insert.

Fig. 2 is the structural representation of middle guider embodiment illustrated in fig. 1 and nail seat.

Fig. 3 is the structural representation of middle guider embodiment illustrated in fig. 1.

Fig. 4 is the structural representation of middle nail seat embodiment illustrated in fig. 1.

Fig. 5 is the installation method sketch map of middle guider embodiment illustrated in fig. 1, and straight arrow is represented the direction of insertion of half guider among the figure.

Fig. 6 is the process that the wears sketch map of hold-down bars 6 in embodiment illustrated in fig. 1, and straight arrow is represented the direction of motion of hold-down bars 6 in the process of wearing among the figure.

The structural representation of another embodiment of the nail rod pedicle screw system that but Fig. 7 is a Wicresoft of the present invention to insert.

Fig. 8 is the structural representation of middle guider embodiment illustrated in fig. 7 and nail seat.

The specific embodiment.

Embodiment 1

Referring to Fig. 1, but the nail that the Wicresoft of present embodiment inserts rod pedicle screw system is the excellent pedicle screw system of universal nail, and this universal pedicle screw system is made up of two screw assemblies and a hold-down bars 6; Wherein, Each screw assembly is made up of nail seat 5, pedicle screw 7, bulb briquetting 8 and plug screw 9, and the cross section of said nail seat 5 is circular, and its center is provided with the through hole that pedicle screw 7 is installed in axial being used to; The bottom of this through hole is the hemispherical nest; Top is that inwall is provided with the cylindrical of female thread, and the head of a nail of described pedicle screw 7 is spherical, is matched with during installation in the hemispherical nest of nail seat 5; The lower end of described bulb briquetting 8 is provided with the hemispherical nest with the spherical head of a nail coupling of pedicle screw 7; This bulb briquetting 8 is threaded in the through hole of nail seat 5, the common spherical pore that constitutes the head of a nail that holds pedicle screw 7 of hemispherical nest on the hemispherical nest on it and the nail seat 5, and the head of a nail of pedicle screw 7 is locked in the nail seat 5.The top of said nail seat 5 is provided with the U type groove 5-2 that is used to wear hold-down bars 6.The structure of above-mentioned nail rod pedicle screw system is a prior art, its more specifically embodiment can be in the application for a patent for invention of CN 101816587 A disclosed " the universal pedicle screw 7 of a kind of internal fixation of spine " with reference to application publication number.

Referring to Fig. 1～Fig. 6; Improvements of the present invention are: each nail seat 5 is provided with a guider of being made up of two and half guiders 1; Described two and half guiders 1 are located on the outer wall of the U type groove 5-2 both sides on the nail seat 5 symmetrically; Each half guider 1 is formed by connecting three sections sheet metals, and wherein, the middle part is one section arc plate 2 that matches with nail seat 5 outer walls (promptly the internal diameter of this arc plate 2 equates with the external diameter of nail seat 5); The arc length of this arc plate 2 equates with the arc length of the outer wall of the nail seat 5 that is positioned at U type groove 5-2 one side, makes the edge at two of this arc plate 2 just overlap with the edge of the side entrance of U type groove 5-2; Two sections sheet metals that are positioned at said arc plate 2 two are guide vane 3, and this guide vane 3 is plate always, are extended to form to the outside of arc plate 2 by the end of arc plate 2; The height of above-mentioned half guider 1 is slightly larger than the degree of depth of said U type groove 5-2.Referring to Fig. 3～Fig. 5; Being evenly equipped with two cross sections parallel with the bus of this arc plate 2 on the inwall of said arc plate 2 is orthogonal protruding 4; This convexity 4 extends to the strip of the continous way distribution of lower limb for the top edge by arc plate 2; The radial centre lines of each cross section of protruding 4 all intersects at the axis of nail seat 5, promptly is equivalent to described protruding 4 and forms by extending a strip boss towards the axis of nail seat 5 on the inwall of arc plate 2; Correspondingly be provided with two locating slot 5-1 that insert set two convexities 4 on described half guider 1 on the outer wall of the U type groove 5-2 both sides of nail seat 5 respectively; The shape size of this locating slot 5-1 cross section is complementary with described protruding 4; Each locating slot 5-1 is extended to form downwards by the upper surface of nail seat 5, and the length of its extension equals the height of said half guider 1.Referring to Fig. 5, when half guider 1 is installed, down adorn from the top of nail seat 5, the convexity 4 on the arc plate 2 is inserted in the locating slot 5-1 of nail seat 5; Two and half guiders 1 of following closely on the seat 5 have all installed; Two guide vanes 3 on this two and half guiders, 1 same head have formed opening horn mouth outwardly; Because the edge at two of arc plate 2 just overlaps with the edge of the side entrance of U type groove 5-2; Make the less end of said bell-mouthed opening just be connected, install and fix the termination that can guide hold-down bars 6 at excellent 6 o'clock well like this and insert in the U type groove 5-2 with the side entrance of U type groove 5-2.

Referring to Fig. 6; During operation; Implant pedicle screw 7 on the vertebral body earlier; And lock it on the nail seat 5 through bulb briquetting 8, then with hold-down bars 6 from wearing to the U type groove 5-2 of another nail seat 5 down through subcutaneous in the U type groove 5-2 of a nail seat 5, through plug screw 9 hold-down bars 6 is locked on the nail seat 5 at last.

Embodiment 2

Referring to Fig. 7 and Fig. 8; The difference of present embodiment and embodiment 1 is that the quantity of the screw assembly in this example is three, and; The guide vane 3 at arc plate 2 two on half guider 1 is the arc that turns down backward; Promptly this arcuate guide wing 3 arches towards with arc plate 2 arches towards on the contrary, the bell-mouthed opening that makes two guide vanes 3 constitute like this is bigger, more helps guiding the insertion of hold-down bars 6.In addition, set convexity 4 makes two boss that discontinuous distributes into by the strip that the continous way of embodiment 1 distributes on the said arc plate 2, and these two boss are arranged at the top edge and the lower edge of arc plate 2 respectively.

Other embodiments beyond present embodiment is above-mentioned are identical with embodiment 1.

Claims

But 1. the nail rod pedicle screw system inserted of a Wicresoft, this system has two cross sections at least for circular nail seat (5), it is characterized in that,

Each nail seat (5) is provided with a guider, and this guider is made up of two and half guiders (1); Described two halves guider (1) symmetry is located on the outer wall of U type groove (5-2) both sides that wear hold-down bars (6) on the nail seat (5); Each half guider (1) is made up of more than or equal to successive three sections of U type groove (5-2) degree of depth height; The middle part is one section arc plate (2) that matches with nail seat (5) outer wall; Its arc length equates that with the arc length of said U type groove (5-2) side outer wall two is guide vane (3), and this guide vane (3) is extended to form to the outside of arc plate (2) by the end of the arc plate (2) at middle part; It is orthogonal convexity (4) with the parallel cross section of said arc plate (2) bus respectively that the inwall of the arc plate (2) at the middle part of described half guider (1) is provided with two, and the radial centre lines of each convexity (4) cross section all meets at the axis of said nail seat (5);

Correspondingly be provided with two locating slots (5-1) that insert described half guider (1) last set two convexities (4) on the outer wall of U type groove (5-2) both sides of described nail seat (5) respectively; To extending below, its development length equals the height of said half guider (1) to this locating slot (5-1) by the upper surface of following closely seat (5).
2. but the nail that Wicresoft according to claim 1 inserts rod pedicle screw system is characterized in that described guide vane (3) is rectilinear.
3. but the nail that Wicresoft according to claim 1 inserts rod pedicle screw system is characterized in that described guide vane (3) be an arc, its arch towards with said arc plate (2) encircle towards on the contrary.
4. but the nail that Wicresoft according to claim 1 and 2 inserts rod pedicle screw system is characterized in that described convexity (4) is successive.
5. but the nail that Wicresoft according to claim 1 and 2 inserts rod pedicle screw system is characterized in that described convexity (4) is what be interrupted.
6. but the nail that Wicresoft according to claim 5 inserts rod pedicle screw system is characterized in that described convexity (4) is formed by two sections, and is located at the top edge and the lower limb of said arc plate (2) inwall respectively.