CN208371875U - A kind of internal fixation of spine pedicle screw - Google Patents

Abstract

The utility model discloses a kind of internal fixation of spine pedicle screws, belong to backbone correcting medical appliance field, the internal fixation of spine pedicle screw of corresponding physiology fine motion can be provided according to human normal physiological activity by being intended to provide one kind, it is characterized in that, a kind of internal fixation of spine pedicle screw, including screw set and ball screw, the ball screw includes stud and the spheric nut fixed with stud top, and the upper concave end of the spheric nut has rotation insertion groove concentric with it；The one end of the spheric nut far from stud is pierced by from the downside that screw covers and covers with screw and is rotatablely connected；The lower part in screw set outside offers location hole along its circumferential direction, and the side wall of the spheric nut offers kidney slot along the vertical direction；Spacer pin of the positioning hole inserted with interference fit, one end of the spacer pin insertion location hole and the slot bottom of kidney slot contradict.

Description

A kind of internal fixation of spine pedicle screw

Technical field

The utility model relates to a kind of backbone correcting medical appliance, in particular to a kind of internal fixation of spine pedicle of vertebral arch screw Nail.

Background technique

Spine nail stick internal fixation system is a kind of highly developed spinal surgery hand in terms for the treatment of spinal injury and disease Art has been widely used and has carried out the reset and fixation of bone.Usually the fasteners such as pedicle screw are implanted into and are fixed with centrum, It is connected by pitman, then is fixed with holding screw, played a supportive role.When boring pedicle screw implantation, with the horizontal paving of centrum Horizontal line and the crosspoint of the convex lateral border of upper joint be entry point, drill through cortex using hole making drill, choose suitable limit and bore Screw way is drilled out, and keeps appropriate angle with centrum coronal-plane and sagittal plane, is screwed into screw along screw way direction using upper nail device, The surgical procedures such as placement, the locking of subsequent pitman are carried out again.

Notification number is that the Chinese patent of CN202933002U discloses a kind of minimally invasive reset monoplane pedicle screw, by One body of screw and nail tail portion composition with sharp keen screw thread, the shape for following closely tail portion is U-shaped groove；In the side wall of the U-shaped groove It is equipped with threaded hole, for being screwed into lock screw after being pressed into hold-down bars；The connection of the body of screw and nail tail portion is spherical Connection, i.e., without having freedom degree in freedom degree, with the left and right directions of U-shaped texturearunaperpendicular in U-shaped groove direction.

Above-mentioned this minimally invasive reset uses monoplane pedicle screw, due to the body of screw and follows closely tail portion in U-shaped groove direction Without freedom degree, although the effect resetted may be implemented, in this way this means that when pitman is put into nail tail portion and fixes, even Taking over the baton can only be as entire screw be along the length direction swing of centrum, this allows for being unable to satisfy human body between fixed centrum The physiology fine motion of required all directions when normal physiological activity, it is long to be pullled toward easy between the bone connected by screw with this And osteoporosis is generated, it is unfavorable for the healing of bone.

Utility model content

The purpose of the utility model is to provide a kind of internal fixation of spine pedicle screws, and having can be according to human normal Physiological activity provides the effect of the physiology fine motion of all directions.

The above-mentioned technical purpose of the utility model has the technical scheme that

A kind of internal fixation of spine pedicle screw, including screw set and ball screw, the ball screw include stud With the spheric nut fixed with stud top, the upper concave end of the spheric nut has rotation insertion groove concentric with it；

The one end of the spheric nut far from stud is pierced by from the downside that screw covers and covers with screw and is rotatablely connected；

The lower part in the outside of the screw set offers and its internal location hole being connected to, the spheric nut along its circumferential direction Side wall offer kidney slot along the vertical direction；

Spacer pin of the positioning hole inserted with interference fit, one end of the spacer pin insertion location hole and kidney slot Slot bottom contradict.

By using above-mentioned technical proposal, spheric nut spacer pin in rotation can be supported with the inner sidewall up and down of kidney slot Touching, which limits the rotations that entire ball screw crosses wide-angle, so that it is loosened when being not easy fixed with centrum；Together When spheric nut can relative to screw cover carry out Universal rotary, allow for patient in this way when carrying out normal physiological activity, spiral shell Nail set can provide jointly corresponding fine motion variable with pitman and improve the matter of area of new bone to be conducive to the healing of centrum Amount, reduces the risk of osteoporosis.

Further, the swing angle of the ball screw is between -10 ° ~ 10 °.

It by using above-mentioned technical proposal, is needed according to the installation of pedicle screw and the amplitude of human spine fine motion, 20 ° Hunting range can satisfy human body proper motion needs so that the whole structure design of screw is more reasonable, It is more in line with base of principle of human engineering.

Further, there are four the kidney slot is set, four kidney slots are distributed in the middle part of spheric nut lateral wall Position.

By using above-mentioned technical proposal, kidney slot is set there are four can satisfy spheric nut, while can also be mitigated single The pressure that spacer pin is born makes it have longer service life.

Further, the side wall of the screw set, which runs through, offers U-shaped stern notch, the center line and screw of the U-shaped stern notch The axis line location of set is in same straight line.

By using above-mentioned technical proposal, U-shaped stern notch plays certain effect of contraction, and slot bottom can be for centrum hand orthosis The pitman of art is put into, so that pitman is not easy that the accurate positioning of operation is shaken and influenced in U-shaped stern notch.

Further, the opposing sidewalls in the U-shaped stern notch are provided with thread groove.

By using above-mentioned technical proposal, thread groove can be threadedly coupled simultaneously with the upper nail device of centrum orthomorphia Be fixed on nail device on, using upper nail device to screw cap progress relevant operation, thus facilitate entire screw is threaded into it is reserved Screw way in.

Further, the upper end of the U-shaped stern notch has upwardly extended arc and has lengthened wall, and the arc lengthens wall and U-shaped tail The part of slot connection offers cutting groove along the circumferential direction that screw covers.

By using above-mentioned technical proposal, the cock that arc lengthening wall can be conveniently used for being fixedly connected stick is screwed in screw thread In slot, recycling nail tail fractures to clamp and arc lengthening wall fractures after the completion of pitman is fixed, so that arc lengthens Wall is not left in the discomfort that human body is caused in cortex.

Further, there are two circular clamping slots for the sidewall symmetry setting of the screw set.

By using above-mentioned technical proposal, after stud is threaded into screw way using upper nail device, clamping slot can be with folder Clencher cooperation fixes its own, so that being not easy to cause the position of entire screw because of maloperation when being put into pitman Deviation.

Further, the rotation insertion groove is interior hexagonal or interior quadrangle or Triangle ID driving hole, or for a word groove, Or cross recess or plum blossom groove.

By using above-mentioned technical proposal, rotating insertion groove can be inserted into the turning tool of its shape adaptation, so as to Enough facilitate and screws in entire screw in pre-drilled screw way.

In conclusion the utility model has the following beneficial effects:

1. enabling to screw set to carry out ten thousand with ball screw by the way that ball stud and screw set to be set as being rotatablely connected To rotation, fine motion required for human normal physiological activity is adapted to this；

2. passing through the setting of waist type groove and spacer pin, the rotational angle of spherical bolt can be limited, so that entire spiral shell It clenches and is not easy the phenomenon that generating loosening because of the normal activity of human body after being fixed in centrum above；

3. lengthening the setting of wall by arc, the cock screwed in for being fastenedly connected stick can be facilitated, while operation terminates It also can be conveniently broken by cutting groove afterwards, so that it will not remain in human body.

Detailed description of the invention

Fig. 1 is in the present embodiment for embodying whole structural schematic diagram；

Fig. 2 is in the present embodiment for embodying the connection relationship diagram of ball screw and screw set.

In figure, 1, screw set；11, location hole；12, U-shaped stern notch；121, thread groove；13, clamping slot；2, ball screw； 21, spheric nut；211, insertion groove is rotated；212, kidney slot；22, stud；3, arc lengthens wall；31, cutting groove；32, screw thread Portion；4, spacer pin.

Specific embodiment

The utility model is described in further detail below in conjunction with attached drawing.

Wherein identical components are presented with like reference characters.It should be noted that word used in the following description Language "front", "rear", "left", "right", "up" and "down" refer to the direction in attached drawing, word " bottom surface " and " top surface ", "inner" and "outside" refers respectively to the direction towards or away from geometric center of specific component.

A kind of internal fixation of spine pedicle screw, as shown in Figure 1, including screw set 1 and ball screw 2.1 is covered in screw Side wall run through and offer U-shaped stern notch 12 for placing pitman, the axial line of center line and the screw set 1 of U-shaped stern notch 12 In same straight line, the opposing sidewalls in U-shaped stern notch 12 are equipped with the thread groove 121 being threadedly engaged with upper nail device；In screw set 1 There are two the round clamping slots 13 being used cooperatively with clamping clip for sidewall symmetry setting.

As shown in Figure 1, being extended with arc identical with its side radian straight up in the upper surface of screw set 1 lengthens wall 3, arc lengthens the threaded portion 32 being provided in wall 3 with thread groove 121 is connected on screw set 1；Wall 3 and screw set are lengthened in arc The part of 1 connection offers cutting groove 31 along the circumferential direction of screw set 1.Arc lengthens wall 3 and can be conveniently used for being fixedly connected with stick Cock is screwed in thread groove 121, and recycling nail tail fractures to clamp and arc lengthening wall 3 fractures i.e. after the completion of pitman is fixed Can, so that arc, which lengthens wall 3, is not left in the discomfort for causing human body in cortex.

As illustrated in fig. 1 and 2, ball screw 2 includes stud 22 and spheric nut 21, and spheric nut 21 is coaxially set with stud 22 The upper end of stud 22 is set and is fixed on, the upper end of spheric nut 21 is pierced by the downside of screw set 1 and is rotatablely connected with screw set 1； Four location holes 11 being connected to inside it, while spherical spiral shell are uniformly provided with along its circumferential direction in the lower part that screw covers 1 lateral wall The middle part of 21 lateral wall of cap is uniformly provided with four kidney slots 212 along the vertical direction.It is bigger that diameter is equipped in location hole 11 The spacer pin 4 of diameter in the inner is interference fit between spacer pin 4 and location hole 11；Spacer pin 4 be inserted into location hole 11 one end with The slot bottom of kidney slot 212 contradicts.Rotary screw set 1 relatively rotates it with ball screw 2, when spacer pin 4 and kidney slot 212 When upper side wall or lower wall, the angle that stud 22 is swung is between -10 °~10 °.Since spheric nut 21 is limited in rotation Pin 4 can be contradicted with the inner sidewall up and down of kidney slot 212, and which limits the rotations that entire ball screw 2 crosses wide-angle, to make It is obtained to be not easy to be detached from out of fixed centrum；Spheric nut 21 can cover 1 in 20 ° of ranges progress Universal rotaries relative to screw simultaneously Turn, can satisfy backbone fine motion variable quantity when human normal movement, allow for patient in this way when carrying out normal physiological activity, Screw set 1 can provide jointly corresponding fine motion variable with pitman and improve area of new bone to be conducive to the healing of centrum Quality reduces the risk of osteoporosis.

As shown in Fig. 2, being recessed straight down in the upper end of spheric nut 21 has the rotation insertion groove being inserted into for rotation tool 211, rotation insertion groove 211 and spheric nut 21 are coaxially disposed, and shape can be interior hexagonal or interior quadrangle or Triangle ID spanner Hole, or be a word groove or cross recess or plum blossom groove, it is allen wrench hole in the present embodiment.

Specific implementation process: being drilled through the entry point of centrum using hole making drill, and drill out screw way using corresponding limit, will The threaded portion 32 that arc lengthens on wall 3 is threaded on nail device, and die nut or other rotation tools is recycled to pass through rotation insertion Ball screw 2 is screwed by slot 211 along screw way direction.Pitman is laterally put into adjacent after entire pedicle screw is fixed In the U-shaped stern notch 12 of two screw caps, lengthening the screw-in cock of wall 3 by arc makes it resist pitman, utilizes in the process Clamping clip clamps clamping slot 13, so that entire pedicle screw and pitman are not susceptible to shake and influence operation precision.Connection Recycling nail tail fractures to clamp and arc lengthening wall 3 fractures after stick clamps, to complete the preliminary fixation of centrum, carries out it again later His centrum orthotic procedure.

This specific embodiment is only the explanation to the utility model, is not limitations of the present invention, ability Field technique personnel can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but As long as all by the protection of Patent Law in the scope of the claims of the utility model.

Claims (8)

1. a kind of internal fixation of spine pedicle screw, it is characterized in that: including screw set (1) and ball screw (2), the bulb Screw (2) includes stud (22) and the spheric nut (21) fixed with stud (22) top, the upper end of the spheric nut (21) Recess has rotation insertion groove (211) concentric with it；

The spheric nut (21) is pierced by the downside of screw set (1) far from the one end of stud (22) and rotates with screw set (1) Connection；

Lower part on the outside of the screw set (1) offers location hole (11) along its circumferential direction, the side wall edge of the spheric nut (21) Vertical direction offers kidney slot (212)；

Spacer pin (4) inserted with interference fit in the location hole (11), the one of spacer pin (4) insertion location hole (11) The slot bottom at end and kidney slot (212) contradicts.

2. a kind of internal fixation of spine pedicle screw according to claim 1, it is characterized in that: the ball screw (2) Swing angle between -10 ° ~ 10 °.

3. a kind of internal fixation of spine pedicle screw according to claim 2, it is characterized in that: the kidney slot (212) If there are four, four kidney slots (212) are distributed in the medium position of spheric nut (21) lateral wall.

4. a kind of internal fixation of spine pedicle screw according to claim 3, it is characterized in that: the screw set (1) Side wall is through offering U-shaped stern notch (12), and the center line of the U-shaped stern notch (12) and the axis line location of screw set (1) are in same Straight line.

5. a kind of internal fixation of spine pedicle screw according to claim 4, it is characterized in that: the U-shaped stern notch (12) Interior opposing sidewalls are provided with thread groove (121).

6. a kind of internal fixation of spine pedicle screw according to claim 5, it is characterized in that: the U-shaped stern notch (12) Upper end upwardly extended arc and lengthen wall (3), the arc lengthens part that wall (3) are connect with U-shaped stern notch (12) along screw The circumferential direction of set (1) offers cutting groove (31).

7. a kind of internal fixation of spine pedicle screw according to claim 6, it is characterized in that: the screw set (1) There are two circular clamping slot (13) for sidewall symmetry setting.

8. a kind of internal fixation of spine pedicle screw described according to claim 1~any one of 7, it is characterized in that: institute Stating rotation insertion groove (211) is interior hexagonal or interior quadrangle or Triangle ID driving hole, or is a word groove or cross recess or plum Flower groove.