CN107582156B

CN107582156B - Connector and fixation system for pedicle screws

Info

Publication number: CN107582156B
Application number: CN201710811263.4A
Authority: CN
Inventors: 张巍; 唐佩福; 袁森; 张�浩
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-09-08
Filing date: 2017-09-08
Publication date: 2020-04-24
Anticipated expiration: 2037-09-08
Also published as: CN107582156A

Abstract

The present disclosure provides a connector for connecting a pedicle screw (8) with a pedicle screw holder (2). The connector includes: a first connection portion (41) for releasably clamping on the pedicle screw holder (2); a connecting rod (42) comprising opposing first (421) and second (422) ends; and a second connection portion (43) for detachable connection to the pedicle screw (8). The first connecting portion (41) is detachably connected to a first end portion (421) of the connecting rod (42), and the second connecting portion (43) is disposed at a position adjacent to at least a second end portion (422) of the connecting rod (42). The present disclosure also provides a pedicle screw fixation system.

Description

Connector and fixation system for pedicle screws

Technical Field

The present disclosure relates to the field of medical devices, and in particular, to a connector and fixation system for pedicle screws.

Background

Pedicle screws are widely used as a mature surgical device in spinal surgery. Especially, the minimally invasive pedicle screw fixing technology which is rapidly developed in recent years is widely applied in the whole world due to small wound and definite effect. In the treatment of spinal injuries and fractures, the minimally invasive pedicle screw mainly has the functions of restoring the spinal column, stabilizing the dynamic segment of the spinal column and promoting the fusion of related segments, and simultaneously can also be used for injecting bone cement and implanting liquid bone through the pedicle screw so as to achieve the effective treatment of the spinal injuries and the fractures.

In the traditional pedicle screw fixator, a plurality of universal pedicle screws can be arranged on a fixing rod of the fixator, and two fixing rods provided with the pedicle screws are connected and fixed through a cross connector. In clinical practice, in order to enhance the fixing effect, a minimally invasive bone grafting support nail which is placed into a vertebral body from the outer side of a vertebral plate is developed on the basis of the traditional pedicle screw rod technology.

However, when the minimally invasive pedicle screw internal fixation is performed, the pedicle screw fixation device generally needs to adapt to the human anatomy structure, and the traditional pedicle screw fixation device has a fixed structure, so that the adjustment of the implantation position and the implantation angle is fixed, and the pedicle screw fixation device is not flexible enough and difficult to adapt to different human anatomy structures, thereby possibly failing to achieve the optimal treatment effect.

Disclosure of Invention

To address at least one of the above technical problems, embodiments of the present disclosure provide a connector for connecting a pedicle screw to a conventional pedicle screw holder.

According to one aspect of the present disclosure, there is provided a connector for connecting a pedicle screw with a pedicle screw holder, the connector comprising:

a first connection for releasably clamping onto the pedicle screw holder;

a connecting rod comprising opposing first and second ends; and

a second connection portion for detachably connecting to the pedicle screw,

wherein the first connecting portion is detachably connected to a first end portion of the connecting rod, and the second connecting portion is provided at least on a second end portion of the connecting rod.

According to some embodiments, the second connection portion comprises: vertical teeth formed on an outer surface of the connecting rod at least at the second end thereof, wherein an extending direction of the vertical teeth is parallel to an axial direction of the connecting rod.

According to some embodiments, the first connection portion comprises a first connection block and a second connection block, the first connection block and the second connection block being relatively movable to clamp or release the pedicle screw fixation device.

According to some embodiments, the connector further comprises a driving member for driving the first connecting block and the second connecting block to move relatively.

According to some embodiments, the drive member comprises a locking screw, and the second attachment block comprises a threaded hole that engages the locking screw.

According to some embodiments, the first connecting block includes opposing first and second sides, the first side being closer to the connecting rod than the second side,

the first connecting block further includes an engagement hole formed through the first side for receiving the first end of the connecting rod.

According to some embodiments, the connector further comprises a pressing piece for pressing the first end of the connecting rod to the first connecting block.

According to some embodiments, the first connection block further comprises opposing first and second surfaces, the second surface being closer to the second connection block than the first surface,

the first connecting block further includes a pressing piece accommodating portion formed in the first surface for accommodating the pressing piece.

According to some embodiments, the connector further comprises a spacer, and the wafer further comprises a spacer receiving portion for receiving the spacer.

According to some embodiments, the first connection block includes a first through hole penetrating the connection block in a direction perpendicular to an axis of the connection rod,

the connecting rod includes a second through hole formed at a first end portion of the connecting rod, the second through hole penetrating the connecting rod in a direction perpendicular to an axis of the connecting rod,

the first through hole and the second through hole are aligned, so that the locking screw penetrates through the first connecting block and the connecting rod.

the engagement hole, the pressing piece accommodation portion, and the first through hole communicate with each other.

According to some embodiments, the second connection portion is formed on an outer surface of the connection rod, and a length of the second connection portion extending in a direction parallel to an axial direction of the connection rod is equal to or greater than one-half of a length of the connection rod.

According to some embodiments, the connecting rod has a length in the range of 20mm to 100 mm.

According to another aspect of the present disclosure, there is also provided a pedicle screw fixation system comprising a fixation device, a connector according to any one of the above aspects or embodiments, and at least one first pedicle screw, the connector being for connecting the at least one first pedicle screw to the fixation device.

According to some embodiments, the fixator comprises at least one second pedicle screw,

the axis of the first pedicle screw and the axis of the second pedicle screw form a preset included angle.

In the connector and the pedicle screw fixing system according to the embodiment of the present disclosure, the pedicle screw may be connected and fixed to the fixator through the connector, and the pedicle screw may be inserted at a greater angle or from a more outer side than a conventional fixing system to be adapted to different human anatomical structures, thereby achieving a better therapeutic effect. In addition, the connector according to the embodiment of the present disclosure may be used to connect a support nail and a conventional pedicle screw rod system to form a space frame structure to enhance the surgical fixation effect.

Drawings

Other objects and advantages of the present disclosure will become apparent from the following description of the disclosure, which is made with reference to the accompanying drawings, and can assist in a comprehensive understanding of the disclosure.

It is noted that the drawings are not necessarily to scale and are merely illustrative of one type of drawing that does not detract from the reader's understanding.

Fig. 1 is a perspective view of a pedicle screw fixation system according to an exemplary embodiment of the present disclosure;

FIG. 2 is a front view of a pedicle screw fixation system according to an exemplary embodiment of the present disclosure;

fig. 3 is a perspective view of a pedicle screw connector according to an exemplary embodiment of the disclosure;

FIG. 4 is a cross-sectional view of a pedicle screw connector according to an exemplary embodiment of the disclosure;

FIG. 5 is a front view of a first connection block of a pedicle screw connector according to an exemplary embodiment of the disclosure;

FIG. 6 is a top view of a first connection block of a pedicle screw connector according to an exemplary embodiment of the disclosure;

FIG. 7 is a partial cross-sectional view of a second attachment block of a pedicle screw connector according to an exemplary embodiment of the disclosure;

FIG. 8 is a top view of a second connection block of a pedicle screw connector according to an exemplary embodiment of the disclosure;

FIG. 9 is a top view of a connecting rod of a pedicle screw connector according to an exemplary embodiment of the disclosure;

FIG. 10 is a front view of a connecting rod of a pedicle screw connector according to an exemplary embodiment of the disclosure;

FIG. 11 is a side view of a connecting rod of a pedicle screw connector according to an exemplary embodiment of the disclosure;

FIG. 12 is a front view of a locking screw of a pedicle screw connector according to an exemplary embodiment of the disclosure;

FIG. 13 is a top view of a locking screw of a pedicle screw connector according to an exemplary embodiment of the disclosure;

FIG. 14 is a top view of a compression tab of a pedicle screw connector according to an exemplary embodiment of the disclosure;

FIG. 15 is a front view of a wafer of a pedicle screw connector according to an exemplary embodiment of the disclosure;

FIG. 16 is a top view of a shim of a pedicle screw connector according to an exemplary embodiment of the disclosure;

FIG. 17 is a front view of a shim of a pedicle screw connector according to an exemplary embodiment of the disclosure;

FIG. 18 is a perspective view of a connection adapter according to an exemplary embodiment of the present disclosure, wherein the connection of the connection adapter to a pedicle screw is schematically illustrated;

FIG. 19 is a plan view of a connection adapter according to an exemplary embodiment of the present disclosure, wherein the connection of the connection adapter to a pedicle screw is schematically illustrated;

FIG. 20 is a bottom view of an adapter body portion of a connection adapter according to an exemplary embodiment of the present disclosure;

FIG. 21 is a front view of an adapter body portion of a connection adapter according to an exemplary embodiment of the present disclosure;

FIG. 22 is a top view of an adapter body portion of a connection adapter according to an exemplary embodiment of the present disclosure;

FIG. 23 is a cross-sectional view of the adapter body portion taken along line B-B shown in FIG. 22;

FIG. 24 is a cross-sectional view of the adapter body portion taken along line A-A shown in FIG. 21;

FIG. 25 is a cross-sectional view of the adapter body portion taken along line C-C shown in FIG. 23;

FIG. 26 is an enlarged view of portion I of FIG. 24;

FIG. 27 is a front view of a compression bar screw connecting adapters according to an exemplary embodiment of the present disclosure;

FIG. 28 is a front view of a live head of a connection adapter according to an exemplary embodiment of the present disclosure;

FIG. 29 is a cross-sectional view of the living head taken along line A-A shown in FIG. 28;

FIG. 30 is a front view of a lock nut of the connection adapter according to an exemplary embodiment of the present disclosure;

FIG. 31 is a front view of a gasket connecting adapters according to an exemplary embodiment of the present disclosure;

FIG. 32 is a top view of a gasket of a connection adapter according to an exemplary embodiment of the present disclosure;

FIG. 33 is an enlarged view of portion I of FIG. 31; and

fig. 34 is a schematic view of a pedicle screw according to an exemplary embodiment of the disclosure.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings of the embodiments of the present disclosure. It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of protection of the disclosure.

Since the dimensions of the various structures involved in the embodiments of the present disclosure are very small, the dimensions and proportions of the various structures in the drawings of the embodiments of the present disclosure are not intended to represent actual dimensions or proportions for the sake of clarity unless explicitly stated otherwise.

Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs.

It should be noted that, although the terms "first", "second", etc. may be used herein to describe various elements, components, elements, regions, layers and/or sections, these elements, components, elements, regions, layers and/or sections should not be limited by these terms. Rather, these terms are used to distinguish one element, component, element, region, layer or section from another. Thus, for example, a first component, a first member, a first element, a first region, a first layer, and/or a first portion discussed below could be termed a second component, a second member, a second element, a second region, a second layer, and/or a second portion without departing from the teachings of the present disclosure.

Furthermore, the word "comprising" or "comprises", and the like, means that the element or component that comes before the word covers the element or component that comes after the word and its equivalents, without excluding other elements or components. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The directional terms "upper", "lower", "left", "right", and the like are used only to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

Fig. 1 shows a schematic structural view of a pedicle screw fixation system according to an exemplary embodiment of the present disclosure. As shown, the pedicle screw fixation system includes a fixator 2, a pedicle screw connector 4, a connection adapter 6, at least one first pedicle screw 8, and at least one second pedicle screw 24.

Referring to fig. 1, the fixator 2 includes a fixation rod 21, a transconnector 22 and a second pedicle screw 24. The transconnector 22 includes a transconnector stem 221 and a transconnector fitting 222. The second pedicle screw 24 is fixedly connected to the fixation bar 21 by a locking screw 26.

In the illustrated embodiment, the holder 2 comprises 2 holding bars 21. The 2 fixing bars 21 are arranged in parallel and connected together by a cross connector 22. Specifically, the transconnector 22 includes 2 transconnector connectors 222, the 2 transconnector connectors 222 being respectively connected to the 2 retainer bars 21, and the transconnector rods 221 connecting the 2 transconnector connectors 222 together, thereby connecting the 2 retainer bars 21 together.

The fixator 2 may include a second plurality of pedicle screws 24 disposed on the fixation rod 21. In the embodiment shown in fig. 1, 4 second pedicle screws 24 are provided on the fixation rod 21. However, the present disclosure is not limited to the number of pedicle screws 24, for example, in other embodiments, fewer (e.g., 2, 3) or more (e.g., 5, 6, or more) second pedicle screws 24 may be provided on the fixation rod 21. Each pedicle screw 24 is fixedly attached to the fixation bar 21 by a respective locking screw 26.

As one example, the second pedicle screw 24 may be a U-shaped pedicle screw. However, in other examples, the second pedicle screw 24 may be other types of screws, such as straight pedicle screws.

It will be appreciated by those skilled in the art that the fixation device may be selected from pedicle screw fixation devices or fixation devices that are conventional in the art, and that more detailed construction of the fixation device may be found with reference to specific construction of pedicle screw fixation devices or fixation devices that are conventional in the art and will not be described further herein.

Referring to fig. 1, the fixing system according to the embodiment of the present disclosure further includes a connector 4, and the connector 4 is used to additionally fixedly connect the first pedicle screw 8 to the holder 2, specifically, to the fixing rod 21 of the holder 2.

As shown in fig. 2, in an embodiment of the present disclosure, the axis of the first pedicle screw 8 forms a predetermined angle α with the axis of the second pedicle screw 24. the predetermined angle α may range from 10 ° to 50 °, and more particularly, in some examples, the predetermined angle α may be 15 °, 20 °, or 30 °.

In the pedicle screw fixing system according to the embodiment of the disclosure, the pedicle screws may be connected and fixed to the fixator through the connectors, and compared with the conventional fixing system, the pedicle screws may be inserted at a larger angle or from a more outer side to adapt to different human anatomical structures, thereby achieving a better treatment effect.

Fig. 3 is a perspective view of a pedicle screw connector according to an exemplary embodiment of the disclosure, and fig. 4 is a cross-sectional view of a pedicle screw connector according to an exemplary embodiment of the disclosure. In conjunction with fig. 3 and 4, the connector 4 may include: a first connection portion 41 for releasably clamping onto the pedicle screw holder 2; a connecting rod 42, the connecting rod 42 including opposing first and second ends 421 and 422 (shown in fig. 10); and a second attachment portion 43 for removable attachment to the first pedicle screw 8. The first connecting portion 41 is detachably connected to the first end portion 421 of the connecting rod 42, and the second connecting portion 43 is disposed at least on the second end portion 422 of the connecting rod 42. By such a connection, the connector can be flexibly mounted on the pedicle screw fixation device. And the second connecting part can be arranged at the second end part of the connecting rod, so that the first pedicle screw can be placed from a position relatively far away from the fixer, and the pedicle screw can be placed from the outer side of the pole to better adapt to different human anatomical structures, thereby realizing better treatment effect.

In one example, as shown in fig. 3, the second connection portion 43 includes: vertical teeth 432 formed on the outer surface of the connecting rod 42 at least at the second end 422. The vertical teeth 432 extend in a direction parallel to the axial direction a1 of the connecting rod 42 (shown in fig. 4). The structure of the vertical teeth will be described in further detail below.

In one example, as shown in fig. 4, the first connection portion 41 includes a first connection block 411 and a second connection block 412, the first connection block 411 and the second connection block 412 being relatively movable to clamp or release the pedicle screw fixation device 2. Specifically, the connector 4 may further include a driving member 45 for driving the first connecting block 411 and the second connecting block 412 to move relatively. When the driving member 45 drives the first connecting block 411 and/or the second connecting block 412 to move towards each other, the first connecting block 411 and the second connecting block 412 may clamp the fixing rod 21 of the pedicle screw fixation device 2; when the driving member 45 drives the first connecting block 411 and/or the second connecting block 412 to move away from each other, the first connecting block 411 and the second connecting block 412 may release the fixing rod 21 of the pedicle screw fixation device 2, thereby achieving a releasable clamping of the first connecting portion 41 on the fixing rod 21 of the pedicle screw fixation device 2.

In the embodiment shown in fig. 4, the driving member includes a locking screw 45, and the second connecting block 412 includes a threaded hole 4122, and the threaded hole 4122 may be threadedly engaged with the locking screw 45. In this manner, when locking screw 45 is moved in threaded hole 4122, second connecting block 412 may be driven toward or away from first connecting block 411.

FIG. 5 is a front view of a first connection block of a pedicle screw connector according to an exemplary embodiment of the disclosure; fig. 6 is a top view of a first connection block of a pedicle screw connector according to an exemplary embodiment of the disclosure. Referring to fig. 5 and 6, the first connecting block 411 includes a first side 4111 and a second side 4112 opposite to each other, and the first side 4111 is closer to the connecting rod 42 than the second side 4112. In fig. 5, the first side 4111 is a right side of the first connecting block 411, and the second side 4112 is a left side of the first connecting block 411.

In one example, the first connecting block 411 may further include an engaging hole 4115 formed through the first side surface 4111, the engaging hole 4115 being configured to receive the first end 421 of the connecting rod 42.

Referring back to fig. 4, the connector may further include a pressing piece 46 for pressing the first end 421 of the connecting rod 42 onto the first connecting block 411.

In this way, the first end 421 of the connecting rod 42 is inserted into the engaging hole 4115, and the pressing piece 46 presses the inserted first end 421 against the first connecting block 411, and then is locked using the locking screw 45, thereby achieving detachable connection of the connecting rod 42 to the first connecting portion 41.

Referring to fig. 5, the first connection block 411 may further include a first surface 4113 and a second surface 4114 opposite to each other, wherein the second surface 4114 is closer to the second connection block 412 than the first surface 4113. In fig. 5, a first surface 4113 is an upper surface of the first connection block 411, and a second surface 4114 is a lower surface of the second connection block 411. The first connection block 411 further includes a tablet housing 4116 formed in the first surface 4113, the tablet housing 4116 being configured to house the tablet 46. In one example, the tablet housing 4116 may be dovetail shaped in cross-section, as shown in fig. 6.

FIG. 9 is a top view of a connecting rod of a pedicle screw connector according to an exemplary embodiment of the disclosure; FIG. 10 is a front view of a connecting rod of a pedicle screw connector according to an exemplary embodiment of the disclosure; fig. 11 is a side view of a connecting rod of a pedicle screw connector according to an exemplary embodiment of the disclosure. With reference to fig. 9, 10 and 11, the connecting rod 42 includes opposite first and second ends 421 and 422. As shown in fig. 5 and 6, the first connection block 411 may further include a first through hole 4117 penetrating the connection block 411 in a direction perpendicular to an axis of the connection rod (i.e., a2 direction in fig. 5). As shown in fig. 9, the connection rod 42 includes a second through hole 423 formed at the first end 421 of the connection rod 42, the second through hole 423 penetrating the connection rod 42 in a direction perpendicular to the axis line thereof. When connecting the first connecting block 411 and the connecting rod 42, the first through hole 4117 and the second through hole 423 are aligned, that is, the axis of the first through hole 4117 is aligned with the axis of the second through hole 423, the locking screw 45 passes through the aligned first through hole 4117 and the second through hole 423, and then the locking screw 45 is threadedly engaged with the threaded hole 4122 of the second connecting block 412, thereby achieving detachable connection of the connecting rod 42 and the first connecting portion 41.

FIG. 7 is a partial cross-sectional view of a second attachment block of a pedicle screw connector according to an exemplary embodiment of the disclosure; fig. 8 is a top view of a second connection block of a pedicle screw connector according to an exemplary embodiment of the disclosure. Referring to fig. 7 and 8, the second connection block 412 includes a second connection block body portion in which a screw hole 4122 and a through hole 4124 are formed, and an axis of the screw hole 4122 and an axis of the through hole 4124 are aligned with each other. In one example, the diameter of the through hole 4124 may be slightly larger than the diameter of the threaded hole 4122 to facilitate movement of the locking screw 45.

Referring back to fig. 5, the first connection block 411 may include a first contact portion 4118 for contacting the fixation rod 21 of the pedicle screw fixation device 2, as shown in fig. 5, the first contact portion 4118 being arc-shaped. Referring to fig. 7, the second connection block 412 may include a second contact portion 4128 for contacting the fixing bar 21 of the pedicle screw fixation device 2, as shown in fig. 7, the second contact portion 4128 having an arc shape. Referring to fig. 4, when the first and second connecting

blocks

411 and 412 are coupled together by the locking screw 45, the first and

second contact portions

4118 and 4128, which have an arc shape, cooperate with each other to form an arc-shaped contact portion that contacts the fixing rod 21 of the pedicle screw holder 2. Through such arrangement mode, the contact area of the first connecting part and the fixing rod is increased, and the connector is more firmly clamped on the fixing rod.

Next, specific structures of the "connecting rod" and the "second connecting portion" are described with reference to fig. 9 to 11. As shown, the connecting rod 42 includes a first end 421 and a second end 422. At the first end 421 of the connecting rod 42, a second through hole 423 into which the locking screw 45 is inserted is formed, and the second through hole 423 penetrates the connecting rod 42 in a direction perpendicular to the axial direction of the connecting rod. At the second end 422 of the connecting rod 42, a second connecting portion 43 is integrally formed. For example, the second connection portion 43 is formed on the outer surface of the connection rod 42. In one example, the second connection portion 43 is formed at least on an outer surface of the second end portion 422 of the connection rod 42.

According to the embodiment of the present disclosure, the length of the connecting rod 42 is designed to be within a reasonable range. In one example, the length of the connecting rod 42 is in the range of 20mm to 100 mm. For example, the length of the connecting rod 42 is about 30 mm. Through the length of rationally designing the connecting rod for the distance between first pedicle screw and the fixer keeps in predetermined distance, namely can put into first pedicle screw with predetermined distance, thereby realizes putting into first pedicle screw from the distance department far away from the fixer (being more outside), avoids haring the vertebra when putting into first pedicle screw.

In one example, the connecting rod 42 is in a "three-piece" configuration, i.e., as shown in fig. 10, the connecting rod 42 includes a first rod portion 424, a second rod portion 425, and a third rod portion 426. First rod portion 424 includes the first end 421, third rod portion 426 includes the second end 422, and second rod portion 425 is formed between first rod portion 424 and third rod portion 426. The second through hole 423 is formed in the first rod portion 424, the second connecting portion 43 is formed in the third rod portion 426, and a stepped portion 427 is formed between the second rod portion 425 and the third rod portion 426. In one example, second shaft portion 425, third shaft portion 426 are each cylindrical in shape, and second shaft portion 425 is circular in cross-section with a diameter of about 4mm and third shaft portion 426 is circular in cross-section with a diameter of about 6 mm.

As shown in fig. 9 and 11, the second connection portion 43 may include: vertical teeth 432 formed on the outer surface of the connecting rod 42. The vertical teeth 432 extend in a direction parallel to the axial direction a1 of the connecting rod 42. In one example, as shown in fig. 11, on the outer surface of the connecting rod 42, 30 vertical teeth 432 are uniformly arranged in the circumferential direction thereof, that is, 30 vertical teeth 432 are uniformly arranged over the entire circumference of the outer surface of the connecting rod 42, that is, every adjacent two vertical teeth 432 are spaced by 12 °. In one example, the included angle between adjacent tooth surfaces of each adjacent two of the vertical teeth 432 is about 60 °, as shown in fig. 11. By such a design of the vertical teeth, the connection between the second connection and the other component can be made more secure.

In one example, the length of the second connection portion 43 extending in a direction parallel to the axial direction a1 of the connection rod 42 is equal to or greater than one-half of the length of the connection rod 42. For example, the length of the connecting rod 42 is about 30mm, and the second connecting portion 43 extends for about 20 mm. In one example, the overall length of the connecting rod 42 is about 30mm, the length of the third rod portion 426 is about 20mm, and the vertical teeth 432 extend for a length of about 20mm, i.e., the vertical teeth 432 extend over the entire outer surface of the third rod portion 426.

In the embodiment of the disclosure, the connecting part for connecting the first pedicle screw is formed on most of the length of the connecting rod, so that when the first pedicle screw is connected and fixed, the placing position of the first pedicle screw can be adjusted according to different human anatomical structures, and different human anatomical structures can be better adapted.

FIG. 12 is a front view of a locking screw of a pedicle screw connector according to an exemplary embodiment of the disclosure; fig. 13 is a top view of a locking screw of a pedicle screw connector according to an exemplary embodiment of the disclosure. Referring to fig. 12 and 13, the locking screw 45 may be a M4 x 0.5 model locking screw and may be an inner six "petal" type screw. The length of the locking screw 45 may be in the range of 10mm-30mm, for example, may be about 11 mm.

FIG. 14 is a top view of a compression tab of a pedicle screw connector according to an exemplary embodiment of the disclosure; fig. 15 is a front view of a compression tab of a pedicle screw connector according to an exemplary embodiment of the disclosure.

As shown, the sheeting 46 can include a first side 461, a second side 462, a first surface 463, and a second surface 464. When the pressing piece 46 is placed in the pressing piece accommodating portion 4116 of the first connecting block 411, the first side surface 461 and the first surface 463 of the pressing piece 46 are aligned with the first side surface 4111 and the first surface 4113 of the first connecting block 411, and the second side surface 462 and the second surface 464 of the pressing piece 46 contact the side surface and the surface of the pressing piece accommodating portion 4116, respectively.

The pressing piece 46 may further include an engagement hole 465 formed through the first side 461 of the pressing piece, the engagement hole 465 for receiving the first end 421 of the connecting rod 42. The pressing piece 46 may further include a through hole 467 that penetrates the pressing piece 46 in the thickness direction of the pressing piece 46 (i.e., the direction a3 in fig. 15).

As shown in fig. 5, the engagement hole 4115, the tablet accommodation portion 4116, and the first through hole 4117 communicate with each other. Thus, when the pressing piece 46 is seated in the pressing piece accommodation portion 4116 of the first connection block 411, the engagement hole 465 of the pressing piece 46 is fitted with the engagement hole 4115 of the first connection block 411 to form a complete engagement hole to receive the first end portion 421 of the connection rod 42; and, the through hole 467 of the pressing piece 46 is matched with the first through hole 4117 of the first connecting block 411 to form a complete through hole for the insertion of the locking screw 45.

In the embodiment shown in fig. 14, the cross-section of the sheeting 46 may be dovetail shaped. Accordingly, the tablet holder 4116 may be dovetail shaped in cross-section as shown in fig. 6. By such a design, it can be ensured that the pressing sheet is accurately positioned in the pressing sheet accommodating portion.

FIG. 16 is a top view of a shim of a pedicle screw connector according to an exemplary embodiment of the disclosure; fig. 17 is a front view of a shim of a pedicle screw connector according to an exemplary embodiment of the disclosure. With reference to fig. 14-17, the connector may further include a spacer 44, and the spacer 44 may include a spacer through hole 442 for insertion of the locking screw 45. As shown in fig. 17, the spacer 44 may protrude upward.

In one example, the sheeting 46 may also include a shim receiver 466 for receiving the shim 44. In this way, when the spacer 44 is placed in the spacer accommodating portion 466, the spacer through hole 442, the through hole 467 of the pressing piece 46 and the first through hole 4117 of the first connecting block 411 are all aligned for insertion of the locking screw 45.

In one example, the thickness of the sheeting 46 may be substantially greater than the thickness of the shim 44, for example, the thickness of the sheeting 46 may be at least twice greater than the thickness of the shim 44, for example, the thickness of the sheeting 46 may be about 2.5mm, and the thickness of the shim 44 may be about 0.3 mm.

Referring back to fig. 1, there is also provided a connection adapter 6, according to an exemplary embodiment of the present disclosure, said connection adapter 6 for connecting said first pedicle screw 8 with a connector 4.

According to an example, as shown in fig. 18 and 19, the connection adapter 6 may include an adapter body portion 61, a rod pressing screw 63, a loose head 64, a lock nut 65, and a washer 66.

FIG. 20 is a bottom view of an adapter body portion of a connection adapter according to an exemplary embodiment of the present disclosure; FIG. 21 is a front view of an adapter body portion of a connection adapter according to an exemplary embodiment of the present disclosure; FIG. 22 is a top view of an adapter body portion of a connection adapter according to an exemplary embodiment of the present disclosure; FIG. 23 is a cross-sectional view of the adapter body portion taken along line B-B shown in FIG. 22; FIG. 24 is a cross-sectional view of the adapter body portion taken along line A-A shown in FIG. 21; FIG. 25 is a cross-sectional view of the adapter body portion taken along line C-C shown in FIG. 23; fig. 26 is an enlarged view of portion I in fig. 24. With reference to fig. 1 and fig. 20 to 26, the connection adapter 6 includes an adapter body portion 61, and the adapter body portion 61 has a fitting connection portion 62 formed therein for fitting and connecting the second connection portion 43 of the connector 4.

In one example, as shown in fig. 23, the mating connection portion 62 includes a mating receptacle 621 formed in the adapter body portion 61 for receiving the second connection portion 43, e.g., the vertical tooth 432, formed on the connecting rod 42. That is, when the connecting bar 42 of the connector 4 is inserted into the fitting insertion hole 621, the axial direction of the fitting insertion hole 621 is parallel to the axial direction a1 of the connecting bar, and the vertical teeth 432 are inserted into the fitting insertion hole 621. The connector 4 and the connection adapter 6 can be engaged by the fitting of the vertical teeth 432 with the fitting insertion holes 621.

Fig. 27 is a front view of a compression bar screw connecting adapters according to an exemplary embodiment of the present disclosure. With reference to fig. 23 and 27, the mating connection portion 62 may further include a screw insertion hole 622 formed in the adapter main body portion 61, the extending direction of the screw insertion hole 622 being perpendicular to the axial direction of the mating insertion hole 621, the screw insertion hole 622 communicating with the mating insertion hole 621, and a thread formed on an inner surface of the screw insertion hole 622 for receiving the plunger screw 63. Thus, the connector 4 and the connection adapter 6 can be connected together by inserting the second connection portion 43 into the fitting insertion hole 621, screwing the presser screw 63 into the screw insertion hole 622 until the end of the presser screw 63 comes into contact with and presses the second connection portion 43.

In one example, as shown in fig. 27, the compression bar screw 63 includes a threaded end 631, the threaded end 631 including at least one recess 6312 for engaging the vertical teeth 432. The recess 6312 receives the raised vertical teeth 432. In this way, the pressing rod screw 63 can firmly press the connector 4 in the mating insertion hole 621. Alternatively, the threaded end 631 may include at least two recesses 6312 for engaging the vertical teeth 432, each recess 6312 receiving a respective one of the raised vertical teeth 432.

In one example, the included angle θ between the opposing surfaces of the recess 6312 may be about 120 °, as shown in fig. 27.

Alternatively, mating vertical teeth may be formed on the inner surface of the mating insertion hole 621, the extending direction of which is parallel to the axial direction of the mating insertion hole 621, the mating vertical teeth engaging with the vertical teeth 432, so that the connector 4 and the connection adapter 6 are better engaged together.

FIG. 28 is a front view of a live head of a connection adapter according to an exemplary embodiment of the present disclosure; fig. 29 is a cross-sectional view of the living head taken along the line a-a shown in fig. 28. Referring to fig. 20, 28, and 29, the connection adapter 6 includes a loose head 64, and a loose head insertion hole 611 for receiving the loose head 64 is formed in the adapter body portion 61, and the extending direction of the loose head insertion hole 611 is perpendicular to the axial direction of the fitting insertion hole 621.

As shown in fig. 28, the movable head 64 includes a gimbal portion 641 formed at an end portion of the movable head. Accordingly, live receptacle 611 includes a first live receptacle portion 6111. The universal connection portion 641 is in a ball head shape, the cross section of the first movable head socket portion 6111 is in a circular shape, and the first movable head socket portion 6111 receives the universal connection portion 641. The knuckle 64 can rotate in the adapter main body portion 61 over a wide range of angles by the engagement of the universal joint portion 641 with the first knuckle insertion hole portion 6111.

The plunger 64 may also include a plunger body portion 642. Accordingly, live receptacle 611 includes a second live receptacle portion 6112. In one example, the cross-section of the living body portion 642 and the cross-section of the second living socket portion 6112 are both approximately racetrack shaped, as shown in fig. 29, and the second living socket portion 6112 receives the living body portion 642.

The piston 64 may further include a third through hole 644, and the third through hole 644 penetrates the gimbal 641 and the piston main body 642 in the longitudinal direction of the piston 64. The third through hole 644 receives the first pedicle screw 8, i.e., the third through hole 644 is in mating connection with the first pedicle screw 8 to connect the first pedicle screw 8 to the connection adapter 6.

The plunger 64 may also include locking threads 6422 formed on the outer surface of the plunger body portion 642, as shown in fig. 28. Locking threads 6422 are used to engage locking nut 65. A locking screw 28 may be formed on an end of the head main body portion 642 remote from the gimbal portion 641. In one example, the length of the locking screw 28 in the axial direction of the third through hole 644 (length L1 in fig. 28) may be in the range of 3mm to 6mm, for example, about 4.7 mm.

Fig. 30 is a front view of a lock nut of a connection adapter according to an exemplary embodiment of the present disclosure. In one example, the lock nut 65 may be a hex nut. In one example, the locking nut 65 may have internal threads with a diameter of 8mm to engage locking threads 6422 formed on the outer surface of the piston body portion 642.

In this way, when the first pedicle screw 8 is to be implanted, the first pedicle screw 8 may be inserted into the third through hole 644 and then the movable head 64 may be rotated in the movable head main body portion 642 to universally adjust the implantation angle of the first pedicle screw 8. When the angle of insertion of the first pedicle screw 8 is adjusted to a predetermined angle, the lock nut 65 may be tightened on the lock screw 6422 to prevent the movable head 64 from rotating in the movable head main body portion 642, thereby fixing the first pedicle screw 8. The "predetermined angle" herein may be a predetermined insertion angle designed according to different human anatomies.

FIG. 31 is a front view of a gasket connecting adapters according to an exemplary embodiment of the present disclosure; FIG. 32 is a top view of a gasket of a connection adapter according to an exemplary embodiment of the present disclosure; fig. 33 is an enlarged view of portion I in fig. 31. As shown in fig. 32, the cross-section of the shim 66 is approximately "racetrack" shaped. The spacer 66 may have a through bore 662 through its thickness, the through bore 662 also having an approximately "racetrack" shape in cross-section for receiving the head body portion 642, i.e., the through bore 662 has a shape and size that matches the shape and size, respectively, of the head body portion 642.

Referring back to fig. 22 and 24, a plurality of racks 6423 are formed on the upper surface of the bit main body portion 642, the racks 6423 extending in a direction perpendicular to the axis of the bit insertion hole 611. Referring to fig. 31, a plurality of engaging splines 663 are formed on at least a portion, e.g., a middle portion, of the lower surface of the spacer 66. When the spacer 66 is placed on the head main body portion 642, the mating rack 663 engages with the rack 6423 to prevent the spacer 66 from sliding relative to the head main body portion 642.

Fig. 26 and 33 show a close up view of a spline 6423 and a mating spline 663, respectively, as shown in fig. 26 and 33, the splines 6423 and mating splines 663 may engage one another, hi one example, spline 6423 has spline parameters of root circle radius R1 of about 6mm, tip circle radius R2 of about 6.4mm, tooth height H1 of about 0.4mm, and bottom width W1 of the recess between two adjacent teeth of about 0.12mm, correspondingly, mating spline 663 has spline parameters of tip circle radius R1 'of about 6mm, root circle radius R2' of about 6.4mm, tooth height H1 'of about 0.4mm, bottom width W1' of the recess between two adjacent teeth of about 0.12mm, alternatively, the included angle β or β 'between the opposing surfaces of two adjacent teeth of about 60 teeth of about 4832 or 582' of about β.

According to an exemplary embodiment of the present disclosure, there is also provided a connection assembly, which may include a connector 4 and a connection adapter 6. The connector 4 may be a connector according to any of the embodiments or examples described above. The connection adapter 6 may be a connection adapter according to any of the embodiments or examples described above. Through according to this connection assembly of this disclosure embodiment, first pedicle screw can follow the position of keeping away from relatively the fixer and put into to can follow utmost point outside and put into pedicle screw, and first pedicle screw can also pass through its angle of putting into of the universal adjustment of live head, so as to adapt to different human anatomical structures better, thereby can realize the treatment of preferred.

Referring back to fig. 1, it should be noted that in some embodiments, the first pedicle screw 8 may be identical to the second pedicle screw 24. In some embodiments, the first pedicle screw 8 may not be identical to the second pedicle screw 24.

Fig. 34 is a schematic view of a pedicle screw according to an exemplary embodiment of the disclosure. The first pedicle screw 8 may include a first threaded section 81, a second threaded section 83, a spacer section 82, a cylindrical section 84, and a tail 85. The first pedicle screw 8 is internally provided with a hollow cavity which is axially communicated, the first threaded section 81 is positioned at the front end part of the first pedicle screw 8, the second threaded section 83 is positioned at the middle part of the first pedicle screw 8, and a spacing section 82 without threads is formed between the first threaded section 81 and the second threaded section 83 at intervals. The rear end of the second thread section 83 is provided with a cylindrical section 84 and a nail tail 85 which are connected in sequence.

In the embodiment shown in fig. 34, the first thread segments 81 have a conical shape, and the cross-sectional size of the first thread segments 81 gradually increases from front to back; the rear end of the first thread segment 81 is smoothly transited to the spacing segment 82, and the diameter of the second thread segment 83 is equal to the diameter of the rear end of the first thread segment 81. The spacer section 82 and the second threaded section 83 are each cylindrical in configuration.

In one example, the taper β 3 of the taper of the first thread segments 81 is about 14 °.

In one example, the diameter of the rear end of the first thread segments 81 and the major diameter of the second thread segments 83 are about 6 mm.

In one example, the pitch of the first thread segments 81 and the second thread segments 83 may be the same, for example 2mm each. In another example, the pitch of the first thread segments 81 and the second thread segments 83 may not be the same.

To accommodate different human pedicle sizes, the length of the first pedicle screw 8 (i.e., length H2 in FIG. 34) may be 180mm to 200mm, e.g., 185mm, 190mm, or 195 mm; the distance from the rear end of the second threaded section 83 to the front end of the first pedicle screw 8 (i.e., the length L2 in fig. 34) may be 35mm to 55mm, for example, 40mm, 45mm, 50 mm.

Through the first pedicle screw according to the embodiment of the disclosure, because the middle section is unthreaded, the direction of the placing space can be conveniently adjusted when the screw is placed, and the stability of the placed screw is ensured by providing holding force by the second thread section after the screw is placed.

It should be appreciated that in other embodiments of the present disclosure, the connector may be directly connected to the first pedicle screw, i.e., the connector directly connects the first pedicle screw to the anchor, in such a way that it is also possible to place the first pedicle screw from a greater distance (i.e., more lateral) than the anchor, avoiding damage to the spine when placing the first pedicle screw.

It should also be noted that, in case of conflict, the embodiments and features of the embodiments of the present disclosure may be combined with each other to obtain new embodiments.

The above is only a specific embodiment of the present disclosure, but the scope of the present disclosure is not limited thereto, and the scope of the present disclosure should be determined by the scope of the claims.

Claims

1. A pedicle screw fixation system comprising a fixation device (2), a connector (4) and at least one first pedicle screw (8), characterized in that,

the connector is used for connecting the at least one first pedicle screw (8) to the fixator (2);

the connector (4) comprises:

a first connection portion (41) for releasably clamping on the holder (2);

a connecting rod (42) comprising opposing first (421) and second (422) ends; and

a second connection portion (43) for detachable connection to the first pedicle screw (8),

wherein the first connecting portion (41) is detachably connected to a first end portion (421) of the connecting rod (42), the second connecting portion (43) being provided on a second end portion (422) of the connecting rod (42);

wherein the pedicle screw fixation system further comprises a connection adapter (6), the connection adapter (6) being for connecting the first pedicle screw (8) with a connector (4);

the connection adapter (6) comprises a movable head (64), the movable head (64) comprises a third through hole (644);

the first pedicle screw (8) is inserted into the third through hole (644), and the angle of the first pedicle screw (8) can be adjusted by rotating the movable head (64);

the movable head (64) comprises: a universal joint part (641) formed at an end of the movable head (64), a movable head main body part (642), and a lock screw (6422) formed on an outer surface of the movable head main body part (642), the movable head (64) being able to be prevented from rotating by tightening a lock nut (65) on the lock screw (6422).

2. The pedicle screw fixation system according to claim 1, wherein the second connecting portion (43) comprises: a vertical tooth (432) formed on an outer surface at the second end (422) of the connecting rod (42), wherein an extending direction of the vertical tooth is parallel to an axial direction (A1) of the connecting rod.

3. The pedicle screw fixation system according to claim 1, wherein the first connection portion (41) comprises a first connection block (411) and a second connection block (412), the first connection block (411) and the second connection block (412) being relatively movable to clamp or release the fixation device (2).

4. The pedicle screw fixation system according to claim 3, wherein the connector further comprises a driving member (45) for driving the first and second connection blocks (411, 412) to move relatively.

5. The pedicle screw fixation system according to claim 4, wherein the drive member includes a locking screw (45), the second attachment block (412) including a threaded hole (4122), the threaded hole (4122) engaging the locking screw (45).

6. The pedicle screw fixation system according to claim 4, wherein the first connection block (411) comprises first and second opposing lateral faces (4111, 4112), the first lateral face (4111) being closer to the connection rod (42) than the second lateral face (4112),

the first connecting block (411) further comprises an engagement hole (4115) formed through the first side surface (4111), the engagement hole (4115) for receiving the first end (421) of the connecting rod (42).

7. The pedicle screw fixation system according to claim 6, wherein the connector further comprises a pressing tab (46) for pressing the first end (421) of the connecting rod (42) onto the first connecting block (411).

8. The pedicle screw fixation system according to claim 7, wherein the first connection block (411) further comprises opposing first and second surfaces (4113, 4114), the second surface (4114) being closer to the second connection block (412) than the first surface (4113),

the first connection block (411) further comprises a tablet accommodation portion (4116) formed in the first surface (4113), the tablet accommodation portion (4116) being for accommodating the tablet (46).

9. The pedicle screw fixation system according to claim 7, wherein the connector further comprises a shim (44),

the pressing piece (46) further includes a spacer accommodating portion (462) for accommodating the spacer (44).

10. The pedicle screw fixation system according to claim 5, wherein the first connecting block (411) comprises a first through hole (4117) extending through the first connecting block (411) in a direction (A1) perpendicular to the axis of the connecting rod,

the connection rod (42) includes a second through hole (423) formed at a first end (421) of the connection rod (42), the second through hole (423) penetrating the connection rod (42) in a direction (A1) perpendicular to an axis of the connection rod,

the first through hole (4117) and the second through hole (423) are aligned such that the locking screw (45) passes through the first connection block (411) and the connection rod (42).

11. The pedicle screw fixation system according to claim 8, wherein the first connecting block (411) comprises a first through hole (4117) extending through the first connecting block (411) in a direction perpendicular to the axis of the connecting rod,

the engaging hole (4115), the pressing piece accommodating portion (4116), and the first through hole (4117) communicate with each other.

12. The pedicle screw fixation system according to claim 1, wherein the second connection portion (43) is formed on an outer surface of the connection rod (42), and a length of the second connection portion (43) extending in a direction parallel to an axial direction (a1) of the connection rod (42) is equal to or greater than one-half of a length of the connection rod (42).

13. The pedicle screw fixation system according to claim 1, wherein the length of the connecting rod (42) is in the range of 20mm to 100 mm.

14. The pedicle screw fixation system according to claim 1, wherein the fixation device (2) comprises at least one second pedicle screw (24),

the axis of the first pedicle screw (8) and the axis of the second pedicle screw (24) form a predetermined included angle (α).