CN106473783B

CN106473783B - Distraction piece for pedicle of vertebral arch fixing system

Info

Publication number: CN106473783B
Application number: CN201611035947.1A
Authority: CN
Inventors: 周锦; 韦冬; 张照远; 周建峰; 罗鹏
Original assignee: Changzhou Waston Medical Appliance Co Ltd
Current assignee: Changzhou Huasen Medical Instrument Co.,Ltd.
Priority date: 2016-11-22
Filing date: 2016-11-22
Publication date: 2020-01-14
Anticipated expiration: 2036-11-22
Also published as: CN106473783A

Abstract

The invention relates to a distraction piece for a pedicle fixation system, which is an integrally formed integral component and comprises a connector, a distraction piece main body and a distraction piece tail which are sequentially connected together, wherein the connector is provided with a convex block; the connector still has a pair of spout, and this pair of spout is symmetrical setting relatively, and every spout sets up along strutting piece length direction. The lug is positioned in the middle of the pair of sliding grooves; the opening sheet main body is provided with a plurality of positioning holes for fixing the opening sheet. The tail part of the opening sheet is provided with a fixing device. The main body of the distraction piece and the tail part of the distraction piece are arranged to be in a straight-line shape, so that 2 pieces of distraction pieces which are arranged oppositely can be conveniently distracted by a distracter, and the requirement of certain degree of elastic deformation during distraction is met. The positioning holes are formed in the supporting sheet main body, so that a pair of oppositely arranged supporting sheets can be supported by the supporting device through selecting different positioning holes when the supporting sheet main body is used, and the problem that the supporting sheets cannot be effectively fixed at proper positions is effectively solved.

Description

Distraction piece for pedicle of vertebral arch fixing system

Technical Field

The invention relates to the technical field of medical instruments, in particular to a distraction plate for a pedicle fixation system.

Background

A pedicle fixation system (hereinafter also referred to simply as a fixation system) is usually composed of a plurality of pedicle fixation units, each of which includes a pedicle screw, a clamping ring, a seat, a connecting rod, and a compression screw. The lower part of the support is provided with a through hole, the support is also provided with a side leg part, the side leg part is provided with an internal thread and 2 oppositely arranged side legs, and a U-shaped channel is formed between the 2 side legs. The upper part of the pressing ring is provided with a U-shaped groove, the pressing ring is sleeved and buckled on the head of the pedicle screw from the upper part of the pressing ring from the lower part of the pressing ring, and the pressing ring and the pedicle screw are in close contact. The pedicle screw passes through the through hole at the lower part of the support from top to bottom by the tail part of the pedicle screw, and the head part of the pedicle screw is limited at the through hole, at the moment, the U-shaped groove of the pressing ring and the U-shaped channel of the support are arranged along the same direction, and the U-shaped groove of the pressing ring is positioned in the U-shaped channel of the support. The connecting rod is matched with the U-shaped channel of the support and the U-shaped groove of the pressing ring.

When the pedicle screw is screwed into the pedicle, the pedicle screw is pressed by the pressing ring positioned above the pedicle screw, and the pressing ring is pressed by the pressing screw, so that the pedicle screw can be screwed into the pedicle. Then adjustments to the fixation system are made. Before adjustment, the connecting rod is required to be arranged between 2 adjacent pedicle fixing units or between 3 adjacent pedicle fixing units. The specific installation method comprises the following steps: after the compression screw is screwed down, one end of the connecting rod is embedded into the U-shaped channel of the support and the U-shaped groove of the pressing ring, and then the compression screw is screwed up and screwed, so that the head of the pedicle screw positioned below is pressed on the support through the pressing ring. The other end of the connecting rod is inserted into the U-shaped channel of the support of the adjacent other pedicle fixing unit and fixed on the other support in the same way, so that the adjacent 2 pedicle fixing units are fixedly connected with each other. According to the requirement, one connecting rod can be connected with 3 pedicle fixing units which are adjacent in sequence and located on a straight line. The entire fixation system can then be adjusted until the adjustment is complete.

The internal fixation technology of the vertebral pedicle screws of the vertebral column is a mature spinal surgery technology and is widely applied to treatment of spinal trauma and degenerative diseases such as spinal fracture, scoliosis, spinal slippage and the like. The traditional pedicle screw internal fixation technology needs to carry out open posterior surgery, corrects spinal deformity well and maintains the stability of the spine, but has large surgical trauma and more blood loss in the surgery due to the fact that extensive tissue incision and long-time traction of surrounding tissues are needed in the surgical process. Meanwhile, the lumbar and back muscles are subjected to ischemic necrosis and fibrosis due to excessive traction and damage to the paraspinal muscles in the operation process, so that the patient cannot get out of bed for early time due to chronic lumbar and back pain after the operation, and needs to lie in bed for a long time after the operation, and the complication incidence rate is obviously increased.

The minimally invasive surgery can be performed in a human body in a small wound environment by using modern medical equipment such as an endoscope and has the advantages of small wound, light pain and quick recovery. By combining the internal fixation technology of the vertebral pedicle screws and the minimally invasive surgery, the technical personnel in the field develop the internal fixation technology of the vertebral pedicle screws, and successfully solve the defects of large operation incision, more muscle stripping, more bleeding, large damage of a posterior stable structure, slow rehabilitation and the like in the traditional internal fixation technology of the vertebral pedicle screws. However, the percutaneous internal fixation of the spine needs to be performed by means of minimally invasive surgery, and the visual field of an operator is poor in the surgical process, so that the problems of complex surgical operation, long surgical time, high difficulty and the like are caused.

In order to solve the above problems, a technique of providing a distraction piece on a support of a pedicle fixation system to ensure that the entire surgical site is exposed in the visual field has been developed, and the use of the distraction piece enables an operator to push the tissue outside the spine outward from the distraction piece during surgery, thereby facilitating the replacement of the connecting rod and the adjustment of the entire fixation system. However, when the existing distraction piece is fixedly connected with the tail part of the support, the distraction piece is required to be installed at the tail part of the support by using a special instrument during fixation, or the distraction piece is directly inserted at the upper part of the side leg part of the support, the special instrument can bring great inconvenience and troublesome operation to the operation when the distraction piece is installed on the support, the special instrument can completely expose the operation part in the visual field, but the situation that the distraction piece is directly inserted at the tail part of the support is easy to fall off in the operation process, and the smooth operation is not facilitated.

Chinese patent document CN 204931830U discloses a pedicle of vertebral arch fixing system, which "includes the support and struts the piece, and the support afterbody has two symmetrical side legs that set up, struts the piece and includes integrated into one piece's the piece main part of strutting and connector, and fixed connection can be dismantled with the side leg to the connector, a fixed slot has been seted up to the side leg, the connector has one along the spout that struts piece length direction, the shape and the side leg shape phase-match of spout, have one in the spout with the fixed slot cooperation, will strut the piece and the fixed lug of support". "when the side leg along the spout slip in-process, the spout can produce little deformation under the effect of lug, when the side leg slides extreme position, the lug just in time card is established in the fixed slot, simple to operate to strutting the piece and having effectively avoided and having come off from the support". However, when the pedicle fixation system with the distraction plate is installed, the distraction plate is usually installed on the pedicle seat first, and then the pedicle fixation system with the distraction plate is installed at the pedicle of the vertebral arch. If the spreader plates are simply mounted together, it is not conducive to rotating the instrument to fix the pedicle screws. If the opening sheet is firstly opened and then installed, the operation incision is inaccurate due to the influence of the opening sheet on the sight. If the incision is too large, unnecessary damage is caused to the patient; if the incision is too small, the distraction plate will shear the tissue surrounding the incision when the pedicle screw is installed. Thus, the installation of a pedicle fixation system with a spreader plate remains a significant problem for physicians in the field.

Disclosure of Invention

The invention aims to solve the technical problems that: the utility model provides a can install pedicle of vertebral arch fixing system smoothly when using, can effectively avoid the piece that struts to the interference of installation again.

The technical scheme for realizing the purpose of the invention is as follows: the distraction piece for the pedicle of vertebral arch fixing system (hereinafter also referred to as distraction piece) comprises a distraction piece main body and a connector which are connected together; the connector is provided with a bump; the structure is characterized in that: the strutting piece is an integral component which is integrally formed, and also comprises a strutting piece tail part, and the connector, the strutting piece main body and the strutting piece tail part are sequentially connected; the main body of the spreading sheet and the tail part of the spreading sheet are in a straight-line shape; the connector is also provided with a pair of sliding chutes, the pair of sliding chutes are oppositely and symmetrically arranged, and each sliding chute is arranged along the length direction of the spreading sheet; the lug is positioned in the middle of the pair of sliding grooves; the opening sheet main body is provided with a plurality of positioning holes for fixing the opening sheet; the tail part of the opening sheet is provided with a fixing device. The tail part of the distraction piece is provided with a fixing device which can draw together 2 distraction pieces oppositely arranged on the support by screwing in the pedicle screw through a corresponding mounting tool, thus being beneficial to the operation of screwing in the pedicle screw and not influencing the sight of an operator. The main body of the distraction piece and the tail part of the distraction piece are arranged to be in a straight-line shape, so that 2 pieces of distraction pieces which are arranged oppositely can be conveniently distracted by a distracter, and the requirement of certain degree of elastic deformation during distraction is met. The positioning holes are formed in the supporting sheet main body, so that a pair of oppositely arranged supporting sheets can be supported by the supporting device through selecting different positioning holes when the supporting sheet main body is used, and the problem that the supporting sheets cannot be effectively fixed at proper positions is effectively solved.

The positioning hole arranged on the distraction piece main body is a waist-round hole, and the long axis direction of the waist-round hole is consistent with the length direction of the distraction piece. The number of the positioning holes arranged on the main body of the spreading sheet is 3-6, and the positioning holes are distributed along the length direction of the spreading sheet. The waist round hole is selected as the positioning hole, and the opening amplitude of the opening sheet can be finely adjusted through the waist round hole after the opening position of the opening sheet is fixed, so that the operation is adapted, and the applicability of the opening sheet 1 is further enhanced.

The connector of the spreading piece comprises a front limiting part, a connecting plate and a right limiting part; the front limiting part and the rear limiting part are arranged on the front side and the rear side of one end face of the left end face and the right end face of the connecting plate in a left-right symmetry manner; the pair of sliding grooves is divided into a front sliding groove and a rear sliding groove, and the front sliding groove and the rear sliding groove are arranged oppositely; wherein a front sliding chute is formed between the front limiting part and the connecting plate, and a rear sliding chute is formed between the connecting plate and the rear limiting part; the lug sets up and connects on the connecting plate, and stretches out towards the direction that sets up the spout. The connector structure is arranged, so that the connector structure can be conveniently and quickly inserted and fixed with the support, is firm and reliable in connection, and can conveniently detach the lower support piece when needed, thereby being suitable for the operation requirement.

The fixing device of the opening sheet is a fixing hole. The number of the fixing holes of the fixing device is 1 to 3. The fixing holes of the fixing device are preferably 2 and distributed along the length direction of the propping sheet, or arranged along the transverse direction or obliquely. Set up the fixed orifices and be fixing device, not only the structure is comparatively simple, installs also comparatively convenient and fast moreover.

The invention has the positive effects that: according to the distraction sheet for the pedicle of vertebral arch fixing system, the main body of the distraction sheet is provided with the plurality of positioning holes for fixing the distraction sheet, and the distraction sheet can be distracted by selecting different positioning holes and positioned at a fixed position when in use, so that the problem that the distraction sheet of the existing pedicle of vertebral arch fixing system can not be effectively fixed at a proper position when in use is effectively solved. The waist round hole is selected to the locating hole, can strut the fixed back in the position at strutting of piece, finely tune the range of strutting the piece through waist round hole to the operation that adapts to the operation has further strengthened the practicality of strutting the piece.

Drawings

FIG. 1 is a schematic view of the present invention in use in installing a pedicle fixation system, the schematic view being divided into a left view, a middle view and a right view according to the position of the drawing. The middle drawing is a perspective schematic view of installing the pedicle fixing system, the left drawing is a partial enlarged schematic view of a circled part at the upper part of the middle drawing, and the right drawing is a partial enlarged schematic view of a circled part at the lower part of the middle drawing.

Fig. 2 is an exploded perspective view of fig. 1.

FIG. 3 is an exploded perspective view of the pull sleeve and backstop device of FIG. 2, with the view direction rotated 90 degrees relative to FIG. 2.

Fig. 4 is a schematic perspective view of the center tube of fig. 2.

Fig. 5 is a perspective view of the present invention, and also a perspective view of the right side of the one of the spreader plates of fig. 2.

Fig. 6 is an assembled view of the holder of the pedicle fixation system of fig. 1 in cooperation with the 2-piece spreader plate of the present invention.

The reference numbers in the above figures are as follows:

the distraction piece 1, the distraction piece main body 11, the connector 12, the left front limiting part 12-1, the connecting plate 12-2, the right rear limiting part 12-3, the distraction piece tail 13, the convex block 14, the positioning hole 15, the fixing hole 16, the sliding groove 17, the left front sliding groove 17-1, the right rear sliding groove 17-2, the support 2, the lateral leg 21, the lateral leg upper section 21-1, the lateral leg lower section 21-2, the fixing groove 22, the fracture opening 23, the central tube 3, the arc-shaped clamping groove 31, the non-return tooth 32, the front side plate 33, the connecting rod 41, the compression screw 42, the pedicle screw 43, the pressing ring 44, the lifting sleeve 5, the pulling lug 51, the hollow channel 52, the non-return groove 53, the positioning clamping groove 54, the positioning bulge 55, the blocking plate 56, the rotating shaft hole 57, the compression spring hole 58, the outer sleeve 6, the operation window 61, the non-return piece 71, the clamping tooth 71-1, the limiting, a rotating shaft 72, a mounting column 73 and a spherical handle 8.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.

(example 1)

Referring to fig. 5, the distraction piece 1 for the pedicle fixation system of this embodiment is an integral injection-molded component made of engineering plastic material, or an integral titanium alloy piece made of titanium alloy material printed and molded by a 3D printer. The spreading sheet 1 comprises a spreading sheet main body 11, a connector 12, a spreading sheet tail 13 (also referred to as tail 13 for short) and a bump 14. The connector 12, the distraction piece main body 11 and the distraction piece tail 13 are sequentially connected, and the distraction piece main body 11 and the distraction piece tail 13 are in a straight flat plate shape.

The connector 12 includes a front stopper 12-1, a connecting plate 12-2, and a rear stopper 12-3. The front limit part 12-1 and the rear limit part 12-3 are respectively arranged at the front and rear sides of the end surface facing to the outside of the left and right end surfaces of the connecting plate 12-2 in a front-back symmetrical manner and form two oppositely arranged slide grooves 17, wherein the front slide groove 17-1 is formed between the front limit part 12-1 and the connecting plate 12-2, and the rear slide groove 17-2 is formed between the connecting plate 12-2 and the rear limit part 12-3. The projection 14 is disposed and connected to the connecting plate 12-2 and projects toward the direction in which the slide groove 17 is disposed. When in use, each opening sheet 1 is fixedly connected with the upper section 21-1 of the corresponding one 21 of the left and right side legs of the support 2 through the connector 12 thereof according to a detachable splicing and fixing mode.

Referring to fig. 5, the spreader main body 11 is provided with 3 to 6 positioning holes 15. The positioning hole 15 is a waist-shaped hole, and the long axis direction of the waist-shaped hole is consistent with the length direction of the distraction sheet. And 3 to 6 are distributed along the length direction of the strutting pieces.

The specific number of positioning holes 15 is preferably 4 in the present embodiment. The positioning hole 15 is designed, so that the problem that the positioning of the distraction piece is difficult in the operation process can be effectively solved; the positioning hole 15 is a waist circular hole, and the opening amplitude of the opening sheet 1 can be finely adjusted through the waist circular hole after the opening position of the opening sheet 1 is fixed, so that the operation is adapted, and the applicability of the opening sheet 1 is further enhanced.

The tail part 13 of the spreading sheet is provided with a fixing device. The fixing means are 2 fixing holes 16. The 2 fixation holes 16 are distributed along the length of the spreader plate (in other embodiments they may be arranged in the transverse direction, or in an oblique direction).

(application example 1)

Referring to fig. 6, this application is an application in which the spreader 1 obtained in example 1 is mounted on the holder 2 of the pedicle fixing system.

Referring to fig. 2, the pedicle screw fixation system obtained in example 1 is fixedly mounted on the holder 2 shown in fig. 2 when the spreader 1 (hereinafter, referred to as spreader 1) is used. The support 2 comprises 2 side legs 21, each side leg 21 being provided with a fixation groove 22. When the opening sheet 1 is installed on the support 2, the front limit part 12-1 and the rear limit part 12-3 on the connector 12 of the opening sheet 1 are clamped on the corresponding one 21 of the left leg and the right leg of the support 2, so that the opening sheet 1 is sleeved on the corresponding one 21 by the connector 12 of the opening sheet 1, and the projection 14 of the opening sheet 1 is inserted into the fixing groove 22 of the corresponding one 21 of the support 2, so that the opening sheet 1 is fixed on the corresponding one 21 of the support 2.

When each of the opening pieces 1 is slid down along both sides of the protruding block 14 into the fixing groove 22 by the sliding grooves 17 on both sides of the opening piece 1 being fitted over the corresponding one of the side legs 21 until the protruding block 14 is inserted into the fixing groove 22, the protruding block 14 is deformed to a certain extent, and the opening piece 1 is moved to the limit position with respect to the side leg 21 by the elastic force of the protruding block 14 due to the deformation. The thickness of the connecting plate 12-2 of the connector 12 is thinner and is between 1 mm and 3mm, and the selected engineering plastic material has certain elasticity, so that the mutual connection between the strutting piece 1 and the support 2 is convenient and reliable.

The fixing device of the tail part 13 of the spreading sheet is used for being fixedly connected with the spreading sheet mounting tool. In the operation process, the distraction piece 1 is fixed with a related installation tool by the tail part 13 of the distraction piece provided with the fixing hole 16 (see application example 2), after a spinal pedicle screw positioned below the distraction piece 1 extends into a pedicle, the installation tool which is connected with the tail part 13 of the distraction piece 1 and used for fixing is taken down, and then a distractor is used for distracting 2 distraction pieces 1 which are oppositely arranged on the support 2 from each other. The position can be selected through the oval positioning hole 15 in the opening process, after the operation is finished, the side leg upper section 21-1 is broken at the breaking port 23 of the support 2 by a breaker, and the broken side leg upper section 21 and the opening sheet 1 are taken out together.

(application example 2)

Referring to fig. 1 and 2, the present application is an installation tool for installing a pedicle fixation system and an installation method thereof. The installation tool comprises a central tube 3, a lifting component, a

spherical handle

8 and 2 distraction pieces 1 obtained in the embodiment 1.

Still referring to fig. 1 and 2, the pulling assembly can be sleeved on the central tube 3 and can move along the axial direction of the central tube 3 at the middle upper part of the central tube 3 relative to the central tube 3 when in use. When in use, the central tube 3 can be arranged on the connecting rod 41 of the pedicle fixing system in a downward pressing manner from the lower end of the central tube and is limited in the circumferential direction, so that the central tube 3 and the pedicle fixing system can rotate together. The lifting component is provided with a corresponding limiting part which can limit the tail part 13 of each sheet opening sheet 1 when in use, each sheet opening sheet 1 can be close to the corresponding side arranged on the left side and the right side of the central tube 3 when in use, and the lower end of each sheet opening sheet 1 is a part which can be fixedly connected on the corresponding side leg 21 of the support 2 when in use. The knob 8 is an integral piece of rubber. When in use, the spherical handle 8 is sleeved on the upper end head of the central tube 3 in a tight fit manner.

The central tube 3, see fig. 4, is a one-piece of steel, provided with a lower end portion and 2 stops. A pair of arc-shaped clamping grooves 31 are formed in the front side plate and the rear side plate of the lower end part, namely, when the central tube 3 is used, the connecting rod 41 is clamped through the pair of arc-shaped clamping grooves 31, so that the central tube and the connecting rod 41 are limited in the circumferential direction (figure 1). Each blocking part of the central tube 3 is arranged on a corresponding plate body on the front side and the rear side of the tube body, namely, each blocking part is a plurality of non-return teeth 32 which are arranged on a corresponding plate body of the front side plate and the rear side plate of the central tube 3, are positioned on the middle upper part of the plate body and face to the outer side.

Referring to fig. 3, the pull assembly includes a pull sleeve 5, an

outer sleeve

6 and 2 non-return means. Referring to fig. 1, the pulling sleeve 5 of the pulling assembly is sleeved on the central tube 3 when the pulling assembly is in use, and the pulling sleeve 5 of the pulling assembly moves relative to the central tube 3 in the axial direction of the central tube 3 at the middle upper part of the central tube 3 when the pulling assembly is in use. Said non-return means are arranged, in use, on respective ones of the front and rear sides of the lifting sleeve 5 and are able to prevent the lifting sleeve 5 from moving downwards when it moves in the axial direction of the central tube 3, under the co-action of respective stops of the central tube 3.

Referring to fig. 1 and 3, the lifting sleeve 5 of the lifting assembly is an injection-molded integral piece, and is provided with a central portion, 2 limiting portions, 2 check groove portions, 2 pull lugs 51 and 2 blocking plates 56. The central part of the lifting sleeve 5 is provided with a central through hole, and the central through hole of the lifting sleeve 5 is sleeved on the central pipe 3 when in use. The 2 limiting parts are positioned at the left side and the right side of the central part, and the limiting part at each side can limit the tail part 13 of the corresponding spreading piece 1 when in use. The limiting part on each side of the left side and the right side is 2 positioning bulges 55 arranged on the corresponding side of the left side and the right side of the lifting sleeve 5 and a positioning clamping groove 54 arranged around the positioning bulges 55. The 2 non-return groove parts are positioned at the front side and the rear side of the central part, and the non-return groove part at each side is provided with a corresponding non-return groove 53. The 2 pulling lugs 51 are positioned at the left side and the right side of the central part and below the corresponding positioning bulges 55, the two pulling lugs 51 are symmetrically arranged, and each pulling lug 51 is provided with a hollow channel 52 which is convenient for the tail part 13 of the distraction piece 1 to penetrate through and penetrates through up and down when in use. Each of the 2-blocker plates 56 is positioned at an upper portion of the check groove 53 of the corresponding check groove portion. Each stop plate 56 is provided with a compression spring hole 58. Each non-return groove part of the lifting sleeve 5 is also provided with 2 rotating shaft holes 57 arranged along the left and right directions, and the axes of the 2 rotating shaft holes are on the same straight line.

Still referring to fig. 1 and 3, each of the 2 non-return devices of the pulling assembly includes a non-return tab 71, a rotating shaft 72, a spring mounting post 73 and a resilient mechanism. The check sheet 71 is an injection-molded integral piece, the rotating shaft 72 and the spring mounting column 73 are both steel integral pieces, and the elastic mechanism is a steel compression spring. The rotating shaft 72 is provided on a corresponding one of the check groove portions of the pulling-up sleeve 5, and passes through a corresponding rotating shaft hole 57. The check piece 71 is fitted over the rotary shaft 72 from the lower portion thereof, and the check piece 71 is located in the check groove 52 of the check groove portion. The lower end of the check sheet 71 is provided with a latch 71-1 which can be engaged with the check tooth 32 in use. The spring mounting posts 73 are provided as inserts on the check plate 71 when the check plate 71 is injection molded. The elastic mechanism is arranged on the check sheet 71, in the application example, a compression spring as the elastic mechanism is fixedly sleeved on the spring mounting column 73 by one end of the compression spring, the other end of the compression spring passes through the spring hole of the corresponding stop plate 56 and is in elastic contact with a corresponding side plate of the front side plate and the rear side plate of the central tube 3 in use, the upper part of the check sheet 71 extends to the outward side of the front side and the rear side under the action of elastic force, and therefore the latch 71-1 of the lower end of the check sheet 71 is elastically meshed with the corresponding check tooth 32 of the central tube 3.

Referring to fig. 1 and 2, the outer sleeve 6 of the pull assembly is an injection molded unitary piece. The outer sleeve 6 is provided with 2 operating windows 61. The outer sleeve 6 is in use fitted over the lifting sleeve 5 with each of its operating windows 61 aligned with the non-return tab 71 of a respective one of the non-return means and with the non-return tabs 71 in their upper part in the operating windows 61 in the state of their latch teeth 71-1 resiliently engaging with the respective non-return teeth 32, so that the operating windows 61 now position the upper part of the non-return tabs 71 in the circumferential direction.

Referring to fig. 1 to 6, the installation tool of the present application is used by first connecting the installation tool with the pedicle fixation system.

The pedicle fixation system of this application example includes a plurality of pedicle fixation units. As shown in fig. 1 and 2, each pedicle fixation unit includes a pedicle screw 43, a pressing ring 44, a holder 2, a connecting rod 41, and a compression screw 42. The lower part of the support 2 is provided with a through hole, the support 2 is also provided with a side leg part, the side leg part is provided with an internal thread and is provided with 2 oppositely arranged side legs 21, and a U-shaped channel is formed between the 2 side legs 21. The upper part of the pressing ring 44 is provided with a U-shaped groove, and the pressing ring 44 is sleeved on the head of the pedicle screw 43 from the upper part by the lower part thereof, and the pressing ring and the pedicle screw are in close contact. The pedicle screw 43 passes through the through hole at the lower part of the support 2 from the tail part thereof from the top to the bottom, and the head part thereof is limited at the through hole, at this time, the U-shaped groove of the pressing ring 44 and the U-shaped channel of the support 2 are arranged along the same direction, and the U-shaped groove of the pressing ring 44 is positioned in the U-shaped channel of the support 2. The connecting rod 41 cooperates with the U-shaped channel of the holder 2 and with the U-shaped groove of the clamping ring 44. For the connecting rod 41 to remain in the body, the connecting rod 41 can be pressed by its one end into the U-shaped channel of the holder 2 and into the U-shaped groove of the clamping ring 44 against the head of the pedicle screw 43 lying below. The compression screw 42 is screwed on the internal thread of the side leg part of the support 2, and compresses the connecting rod 41 from the upper part, thereby compressing the pedicle screw 43. The other end of the connecting rod 41 is inserted into the U-shaped channel groove of the holder of the adjacent other pedicle fixation unit and fixed on the other holder, so that the adjacent 2 pedicle fixation units are fixedly connected with each other. The connection between other adjacent pedicle fixing units of the whole pedicle fixing system can also be that one connecting rod is connected with 3 sequentially adjacent three pedicle fixing units on a straight line according to the requirement. When the pedicle screws 43 are screwed in after the holes are drilled in the pedicles, the length of the connecting rod 41 is shorter and only fixedly connected to one support 2, so that the pedicle screws 43 can be conveniently screwed into the pedicles along with the rotation of the installation tool.

When the mounting tool obtained by the application example and the pedicle fixing unit are used for carrying out operation together, the mounting tool is firstly assembled, then the mounting tool is connected with the pedicle fixing unit, and then the pedicle fixing unit is fixed until the operation of the whole pedicle fixing system is finished, wherein the specific main steps are as follows:

first, each check means is installed in a corresponding one of the check groove portions of the lifting sleeve 5, that is, one end of the compression spring is fitted over the installation post 73 fixed to the upper portion of the check piece 71, and the other end of the compression spring is made to protrude into the compression spring hole 58 of the blocking plate 56, and one surface of the stopper 71-2 of the check piece 71, which faces the outside of the front and rear sides, is made to face the inner wall of the central through hole of the lifting sleeve 5, which faces the central axis, thereby positioning the check piece 71 at the corresponding check groove 53 by the compression spring. The rotating shaft 72 is then passed through one of the rotating shaft holes 57 of the check groove portion, the corresponding mounting hole of the lower portion of the check piece 71, and the other rotating shaft hole 57 of the check groove portion in this order, whereby the check device is mounted on the pull-up sleeve 5. When the rotation shaft 72 is inserted through the mounting hole of the lower portion of the check piece 71, the check piece 71 is moved downward by a small distance with respect to the check groove 53, so that the stopper 71-2 of the check piece 71 enters the check groove 53. The installation mode enables the check device to be installed conveniently and quickly.

Secondly, each of the 2 spreading pieces 1 passes through the hollow channel 52 of the pull lug 51 of the lifting sleeve 5 from bottom to top from the tail part 13 thereof, then extends into the positioning slot 54 of the lifting sleeve 5, and is sleeved on the positioning protrusion 55 of the lifting sleeve 5 by the 2 fixing holes 16 thereof.

Third, the outer sleeve 6 is fitted over the pull sleeve 5 such that each of the operating windows 61 of the outer sleeve 6 is aligned with a corresponding one of the check tabs 71 and the tail portions 13 of the 2 spreader tabs 1 are also all located in the outer sleeve 6.

Fourthly, the spherical handle 8 is sleeved on the upper end head of the central tube 3, then the central tube 3 passes through the central through hole of the lifting sleeve 5 from top to bottom from the lower end head, and the front side and the rear side of the central tube 3 provided with the non-return teeth 32 correspond to the front side and the rear side of the lifting sleeve 5 provided with the non-return grooves 53. When the central tube 3 is inserted into the pulling sleeve 5, the front side plate 33 and the rear side plate thereof are both in elastic contact with the latch 71-1 of the check piece 71 and push the latch 71-1 outward until the central tube 3 reaches a desired position relative to the pulling sleeve 5. At this time, when the center tube 3 is moved upward relative to the pulling sleeve 5 by the compression spring, the lower end surface of the latch 71-1 of the check piece 71 is in contact with the upward end surface of the check tooth 32 of the center tube 3 to be stopped, and is thereby caught and stopped. At this time, the user needs to press the upper portion of the check tab 71 from outside to inside with his/her finger so that the lower end surface of the latch 71-1 is separated from the upper end surface of the check tooth 32 of the center tube 3, and the center tube 3 can be moved upward. So that the position of the central tube 3 relative to the pulling sleeve 5 can be adjusted.

Fifthly, when the position of the central tube 3 relative to the pulling sleeve 5 is adjusted to be in place, the connection between the pedicle fixing unit and the installation tool can be carried out. Referring to fig. 6, each side leg 21 of the support 2 includes an upper side leg section 21-1 and a lower side leg section 21-2, a breaking opening 23 for breaking is provided between the upper side leg section 21-1 and the lower side leg section 21-2, and each upper side leg section 21-1 is provided with a fixing groove 22.

When the strutting piece 1 is arranged on the support 2, the central tube 3 is aligned with the connecting rod of the fixing system from top to bottom through the arc clamping groove 31 and clamped. Then the front limit part 12-1 and the rear limit part 12-3 on the connecting head 12 of each expansion piece 1 are used for clamping the upper section 21-1 of the corresponding side leg 21, so that each expansion piece 1 is sleeved on the corresponding side leg 21 through the connecting head 12, and the convex block 14 of the expansion piece 1 is inserted into the fixing groove 22 of the upper section 21-1 of the corresponding side leg of the support 2, so that the expansion piece 1 is fixed on the upper section 21-1 of the corresponding side leg 21 of the support 2.

When each expansion piece 1 is sleeved on the corresponding side leg upper section 21-1 through the sliding grooves 17 on the two sides of the expansion piece and slides downwards along the two sides of the side leg upper section 21-1 until the convex block 14 is inserted into the fixing groove 22, the convex block 14 can be deformed to a certain extent, and under the action of elastic force generated by deformation of the convex block 14, the expansion piece 1 moves to the limit position relative to the side leg 21. The connecting plate 12-2 of the connector 12 is thin and 1-3mm thick, and the material is selected from elastic materials such as plastics, so that the problems of the existing pedicle fixing system can be completely solved, and the pedicle fixing system is convenient to use. Sixthly, when the fixing operation of the pedicle screw 43 is carried out, an operator holds the spherical handle 8 by the right hand, holds the pull lug 51 and the outer sleeve 6 of the lifting sleeve 5 by the left hand, adjusts the position of the lifting sleeve 5 relative to the central tube 3 by operating the non-return device, rotates the spherical handle 8 downwards to screw the spinal pedicle screw 43 positioned below the distraction piece 1 into the pedicle by the installation tool, sequentially removes the central tube 3 with the spherical handle 8 and the outer sleeve 6, and then releases the positioning connection of the tail part 13 of the distraction piece 1 and the lifting sleeve 5, so that the lifting sleeve 5 can be removed together with the non-return device carried by the lifting sleeve, and at the moment, the distracter can be used for distracting the 2 distraction pieces 1 oppositely arranged on the support 2 from each other. The position can be selected through the waist-circle positioning hole 15 in the opening process. The shorter connector rod 41 can then be replaced with the longer connector rod 41 as needed and the pedicle fixation system adjusted in a better field of view and range of operation until the adjustment is complete.

Seventhly, the upper section 21 of the side leg of the support 2 is broken at the breaking port 23 of the support 2 by a breaker, so that the support and the opening sheet 1 are taken down from the operation position, and then follow-up operations such as suturing and the like are carried out, thus completing the operation.

Those of ordinary skill in the art will understand that: the present invention is not limited to the above embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A distraction piece for a pedicle fixation system comprises a distraction piece main body (11) and a connector (12) which are connected together; the connector (12) is provided with a lug (14); the method is characterized in that: the strutting piece is an integral component which is integrally formed, and also comprises a strutting piece tail part (13), and the connector (12), the strutting piece main body (11) and the strutting piece tail part (13) are sequentially connected; the main body (11) of the spreading sheet and the tail part (13) of the spreading sheet are in a straight flat plate shape; the connector (12) is also provided with a pair of sliding grooves (17), the sliding grooves (17) are oppositely and symmetrically arranged, and each sliding groove is arranged along the length direction of the spreading sheet; the lug (14) is positioned in the middle of the pair of sliding grooves (17); the opening sheet main body (11) is provided with a plurality of positioning holes (15) for fixing the opening sheet; the tail part (13) of the spreading sheet is provided with a fixing device.

2. The distraction plate for a pedicle fixation system according to claim 1, wherein: the positioning hole (15) is a waist-round hole, and the long axis direction of the waist-round hole is consistent with the length direction of the distraction sheet.

3. The distraction plate for a pedicle fixation system according to claim 2, wherein: 3-6 positioning holes (15) are formed in the spreading sheet main body (11) and are distributed along the length direction of the spreading sheet.

4. The distraction plate for a pedicle fixation system according to claim 1, wherein: the connector (12) comprises a front limiting part (12-1), a connecting plate (12-2) and a right limiting part (12-3); the front limiting part (12-1) and the right limiting part (12-3) are symmetrically arranged on the front side and the rear side of one end face of the left end face and the right end face of the connecting plate (12-2) in a left-right mode; the pair of sliding grooves (17) are divided into a front sliding groove (17-1) and a rear sliding groove (17-2), and the front sliding groove (17-1) and the rear sliding groove (17-2) are arranged oppositely; wherein a front sliding groove (17-1) is formed between the front limiting part (12-1) and the connecting plate (12-2), and a rear sliding groove (17-2) is formed between the connecting plate (12-2) and the rear limiting part (12-3); the projection (14) is arranged and connected on the connecting plate (12-2) and extends out towards the direction of the arranged sliding groove (17).

5. The distraction plate for a pedicle fixation system according to claim 1, wherein: the fixing device is a fixing hole (16).

6. The distraction plate for a pedicle fixation system according to claim 5, wherein: the number of the fixing holes (16) of the fixing device is 1 to 3.

7. The distraction plate for a pedicle fixation system according to claim 6, wherein: the number of the fixing holes (16) of the fixing device is 2, and the fixing holes are distributed along the length direction of the expanding sheet, or are arranged along the transverse direction, or are arranged in an inclined mode.