CN210521076U

CN210521076U - Pedicle screw fixing device and system for thoracolumbar posterior correction

Info

Publication number: CN210521076U
Application number: CN201920481658.7U
Authority: CN
Inventors: 晏怡果; 彭文; 王程
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-04-10
Filing date: 2019-04-10
Publication date: 2020-05-15
Anticipated expiration: 2029-04-10

Abstract

The utility model provides a fixing device and a fixing system for a thoracolumbar vertebra posterior orthopedic pedicle screw, which relate to the technical field of medical appliances, and comprise a pedicle screw, a limiting part and a locking part; the pedicle screw comprises a screw head part and a screw body part which are connected; the head of the screw is provided with a chute for placing the connecting rod; the limiting piece is movably connected with the sliding groove and can move along the axial direction of the sliding groove, and an installation channel is arranged in the limiting piece in a penetrating way along the axial direction; locking piece and installation passageway swing joint, the axial displacement of installation passageway can be followed to the locking piece, and this chest lumbar vertebrae way of escape is orthopedic with pedicle of vertebral arch nail fixing device has improved current spout nail growth stick system to the form of locating part cooperation locking piece has avoided current spout nail system to need open the operation once more when final operation, and changes original interior plant, has greatly reduced patient's misery and economic burden.

Description

Pedicle screw fixing device and system for thoracolumbar posterior correction

Technical Field

The utility model relates to the technical field of medical appliances, concretely relates to thoracolumbar vertebrae way of escape is orthopedic with pedicle screw fixing device and fixed system.

Background

Early-onset scoliosis (EOS) refers to a pediatric scoliosis not older than 10 years of age, covering a variety of causes including congenital, neurofibromatosis, neuromuscular, idiopathic and others with scoliosis concomitant with the syndrome. Because EOS is early in onset age and lung development is not completed until about 8 years old, the thoracoid deformity caused by scoliosis is not favorable for lung development and maturity, so EOS is often accompanied with lung dysfunction. Meanwhile, EOS has the characteristics of serious deformity, rapid progress and the like, and the sick children not only have short and small body and high early mortality, thereby bringing great difficulty to treatment and serious burden to the society and families of patients.

The treatment method of the EOS mainly comprises two aspects of conservative treatment and operation treatment, wherein the conservative treatment comprises observation, plaster external fixation, brace fixation, traction and the like; surgical treatments include fusion and non-fusion procedures. However, most scholars believe that conservative treatment is only a palliative activity, the main effect is to delay the further development of spinal deformities and to delay the operative age, and surgical treatment remains the primary method of treating early-onset scoliosis. With the updating of medical equipment and the rapid advance of medical level, surgical treatment methods are also changed day by day, the traditional fusion operation is gradually replaced by non-fusion operation due to more defects, and the non-fusion operation has the characteristic of maintaining the normal growth of the spine due to the fact that the growth potential of the spine is reserved, so that the non-fusion operation is popular with students.

With the development of theory and technology, the non-fusion hand technology is also continuously updated. Harrington first reported non-fusion surgical treatment of scoliosis in 1963, while he considered that the final spinal fusion should be avoided in children under the age of 10 years. After that, various types of growing rods are gradually emerging: the unilateral growth rod, the bilateral growth rod, the mixed growth rod and the like, but the growth rod needs repeated distraction and prolonged operations, the repeated operations easily damage periosteum to cause bone destruction, and spontaneous fusion of the spine easily occurs to influence the growth capability of the spine and the orthopedic effect of scoliosis. In addition, repeated operations not only have high cost and gradually increased operation difficulty, but also have high complications. In order to overcome the disadvantages, the automatic sliding type growth rod system mainly comprises a Shilla system, a Luque system, a plate rod growth rod system, a chute nail growth rod system, an in vitro magnetic control growth rod system and the like, and the growth rod system does not need repeated operation to cut open the growth rod and simultaneously has good operation orthopedic effect, thereby being gradually favored by scholars at home and abroad.

Meanwhile, after the patient receives the growth rod system for spinal orthopedic surgery and maintains the growth potential of the spine to finish the orthopedic surgery treatment, the fusion operation needs to be finally carried out on the fusion segment or the segment which is easy to be corrected and lost again. At this moment, the growth rod system which is kept in the body of the patient for a long time is required to be dismantled, meanwhile, the common fixing nails are placed in the body again, the chest and waist section spine of the patient needs to be incised in the whole course in the operation, the operation wound is large, bleeding is more, and meanwhile, the replacement of the inner fixing device again leads to higher operation cost.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a chest lumbar vertebrae way of escape is orthopedic with pedicle screw fixing device, this chest lumbar vertebrae way of escape is orthopedic with pedicle screw fixing device can solve the above-mentioned not enough of prior art, has avoided current spout nail system to need open the operation once more when final operation to change original interior plant, greatly reduced patient's misery and economic burden.

Based on the above object, the utility model provides a thoracic vertebra lumbar vertebrae way of escape is orthopedic with pedicle screw fixing device, include:

the pedicle screw, the limiting piece and the locking piece;

a pedicle screw comprising a screw head and a screw body; the screw head is provided with a sliding groove for placing a connecting rod, and the screw body is connected with the screw head;

the limiting piece is movably connected with the sliding groove and can move along the axial direction of the sliding groove, and an installation channel is arranged in the limiting piece in a penetrating way along the axial direction;

and the locking piece is movably connected with the mounting channel and can move along the axial direction of the mounting channel.

Furthermore, the sliding groove is U-shaped, and a positioning step is arranged on the inner wall of the sliding groove and used for preventing the limiting piece from moving towards the direction of the screw body.

Furthermore, the outer wall of the screw head is provided with a clamping groove for clamping the screw head and assisting in reshaping.

Furthermore, the limiting part is a cylindrical nut, the limiting part is in threaded connection with the sliding groove, and an installation channel which is through along the axial direction is arranged in the limiting part.

Furthermore, one end, far away from the screw body, of the limiting part is provided with a polygonal first groove to be used in cooperation with a nut locking device, and the diameter of the first groove is larger than that of the installation channel.

Furthermore, a limiting plate is arranged at the position, close to the port of the first groove, of the mounting channel, and is used for preventing the locking piece from falling off the mounting channel.

Further, the locking piece is a cylindrical nut, and the locking piece is in threaded connection with the mounting channel.

Furthermore, one end of the locking piece, which is far away from the screw body part, is provided with a polygonal second groove so as to be matched with the nut locking device for use.

Furthermore, one end of the locking piece, which is close to the screw body, is provided with a propping part for propping against the connecting rod.

Further, the head end of the abutting portion is spherical.

Further, the outer wall of one end of the screw body part close to the screw head part is provided with a first thread.

Further, the outer wall of one end, far away from the screw head, of the screw body is provided with second threads, and the thread pitch of the second threads is larger than that of the first threads.

Further, the positions of the second threads and the first threads are subjected to acid etching and sand blasting treatment to form a local micropore structure.

Based on the above purpose, the utility model also provides a fixing system, which comprises a connecting rod and at least two pedicle screw fixing devices for thoracolumbar posterior correction;

the connecting rod is arranged in a sliding groove of the pedicle screw fixing device for thoracolumbar posterior correction in a penetrating manner, and is positioned between the locking piece and the groove bottom of the sliding groove.

Adopt above-mentioned technical scheme, the utility model provides a thoracic lumbar vertebrae way of escape is orthopedic with pedicle screw fixing device's technological effect has:

the pedicle screw fixing device for thoracolumbar posterior correction is characterized in that the existing chute screw growth rod system is improved, and in a mode that a limiting part is matched with a locking part, when a patient needs to slide in a chute in a first-stage operation, only the limiting part is locked, the correction effect on the patient is realized, and the growth potential of a non-fused section of the patient is reserved; when a patient needs to perform a termination operation, the internal fixing device is only needed to be detached from the segments which are complete in growth potential of the patient and difficult to cause orthopedic loss again through the small-incision minimally invasive operation, and the locking piece is locked in place through the small-incision minimally invasive operation on the segments which need to be fixed and fused, so that the reliable locking between the connecting rod and the pedicle screw can be realized; the operation that need open once more when final operation of current spout nail system has been avoided to original interior plant is changed, has reduced patient's misery and economic burden by a wide margin.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of a pedicle screw fixing device for thoracolumbar posterior correction according to an embodiment of the present invention;

fig. 2 is a sectional view of a pedicle screw fixing device for thoracolumbar posterior correction shown in fig. 1;

fig. 3 is a schematic structural diagram of a limiting member according to a first embodiment of the present invention;

fig. 4 is a schematic structural diagram of a locking element according to an embodiment of the present invention.

Reference numerals: 100-pedicle screws; 110-screw head; 111-a chute; 112-positioning step; 113-a card slot; 120-a screw body; 121-a first thread; 122-a second thread; 200-a stopper; 210-installing a channel; 220-a first groove; 230-a limiting plate; 300-a lock; 310-a second groove; 320-a top-butting part; 400-connecting rod.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example one

As shown in fig. 1 to 4, the embodiment of the present invention provides a pedicle screw fixing device for thoracolumbar vertebra posterior correction, including: pedicle screw 100, stop 200 and locking element 300;

wherein, the pedicle screw 100 comprises a screw head 110 and a screw body 120; the screw head 110 is provided with a sliding groove 111 for placing a connecting rod, and the screw body 120 is connected with the screw head 110;

the limiting piece 200 is movably connected with the sliding groove 111 and can move along the axial direction of the sliding groove 111, and an installation channel 210 is arranged in the limiting piece 200 in a penetrating manner along the axial direction;

the locking member 300 is movably coupled to the mounting channel 210, and the locking member 300 can move in the axial direction of the mounting channel 210 to pressurize or decompress the connecting rod.

The pedicle screw fixing device for thoracolumbar posterior correction is an improvement on the existing sliding groove screw growth rod system, and in the form that the limiting piece 200 is matched with the locking piece 300, when a patient needs to slide in the sliding groove 111 during a first-stage operation, only the limiting piece 200 is locked, the correction effect on the patient is realized, and the growth potential of a non-fused section of the patient is reserved; when a patient needs to perform a termination operation, the internal fixing device is only needed to be detached from the segments which are complete in growth potential of the patient and difficult to cause orthopedic loss again through the small-incision minimally invasive surgery, and the locking piece 300 is locked in place for the segments which need to be fixed and fused through the small-incision minimally invasive surgery, so that the connecting rod and the pedicle screw 100 can be reliably locked; the operation that need open once more when final operation of current spout nail system has been avoided to original interior plant is changed, has reduced patient's misery and economic burden by a wide margin.

As shown in fig. 1 and fig. 2, in an embodiment of the present invention, the sliding groove 111 is configured in a U shape, the inner wall of the sliding groove 111 is provided with a positioning step 112, and the positioning step 112 is used for limiting the moving stroke of the position-limiting member 200, so as to prevent the position-limiting member 200 from moving toward the screw body 120. In addition, the whole screw head 110 is also provided with a U shape, which plays a role of conveniently assembling the connecting rod.

In an embodiment of the present invention, the outer wall of the screw head 110 is provided with a clamping groove 113 for clamping the screw head 110 and assisting in orthopedic correction.

In an embodiment of the present invention, the pedicle screw 100 is preferably made of titanium alloy.

As shown in fig. 3, in an embodiment of the present invention, the limiting member 200 is a cylindrical nut, and the limiting member 200 is in threaded connection with the sliding groove 111, so that the limiting member 200 can be conveniently adjusted; the stopper 200 is provided with an installation passage 210 extending therethrough in the axial direction, and the installation passage 210 is used for installing the locking member 300. The stopper 200 is preferably made of a titanium alloy material.

In an embodiment of the present invention, one end of the limiting member 200, which is far away from the screw body 120, is provided with a polygonal first groove 220, and the diameter of the first groove 220 is larger than the diameter of the installation channel 210, so as to cooperate with the nut locking device for use, thereby facilitating the nut locking device to adjust the position of the limiting member 200 in the sliding groove 111.

The utility model discloses an embodiment, the port position that installation passageway 210 is close to first recess 220 sets up limiting plate 230, and limiting plate 230's effect restricts the removal stroke of locking piece 300 for prevent that locking piece 300 from deviating from installation passageway 210, provide the guarantee for the regulation of locking piece 300.

As shown in fig. 4, in one embodiment of the present invention, the locking member 300 is a cylindrical nut, and the locking member 300 is threadedly coupled to the mounting channel 210. Adjustment of the position of the locking member 300 within the mounting channel 210 is facilitated. The locking member 300 is preferably made of a titanium alloy material.

In one embodiment of the present invention, the end of the locking member 300 away from the screw body 120 is provided with a polygonal second groove 310 to cooperate with the nut locking device, so as to facilitate the nut locking device to adjust the position of the locking member 300 in the installation channel 210.

In one embodiment of the present invention, the locking member 300 is disposed near one end of the screw body 120 to abut against the top portion 320 for abutting against the connecting rod. In particular, the head of the abutting portion 320 is provided with a spherical shape to increase the stability of the locking member 300 when locking the connecting rod.

In one embodiment of the present invention, the outer wall of the screw body 120 near one end of the screw head 110 is provided with a first thread 121. The smaller pitch of the first thread 121 facilitates increased stability of the connection with cortical bone.

In an embodiment of the present invention, the outer wall of the screw body 120 away from the screw head 110 is provided with a second thread 122, and the thread pitch of the second thread 122 is greater than the thread pitch of the first thread 121, so as to increase the stability of connection with cancellous bone.

In one embodiment of the present invention, the positions of the second thread 122 and the first thread 121 are subjected to acid etching and sand blasting to form a local micro-porous structure. The integration of the metal bone interface is facilitated, and the holding force of the screw body 120 is increased.

In addition, it should be noted that the diameter and length of the screw body 120 may be varied to meet the actual surgical needs. All parts of the main body of the pedicle screw 100 exposed to tissues are passivated by adopting a cambered surface structure and edges, so that the disturbance to the soft tissues behind the neck is reduced, the cutting of peripheral muscles by sharp edges is avoided, and the discomfort and the complications of the patient after the operation are avoided.

The embodiment of the utility model provides a thoracic vertebra lumbar vertebrae way of escape is orthopedic with pedicle screw fixing device has following advantage:

(1) the existing chute nail growth rod system is improved, the limiting part 200 is matched with the locking part 300, the situation that the existing chute nail system needs to be cut again in the final operation is avoided, the original inner plants are replaced, and the pain and the economic burden of a patient are greatly reduced.

(2) The double-screw structural design of the first screw thread 121 and the second screw thread 122 is adopted, and meanwhile, the surface of the screw is subjected to acid etching and sand blasting to construct a local micropore structure, so that the integration of a metal bone interface is facilitated, the holding force of the screw body part 120 is greatly increased, and the probability of screw body looseness in the orthopedic process is reduced to a certain extent.

Example two

As shown in fig. 1 and 2, an embodiment of the present invention provides a fixing system, which includes a connecting rod 400 and at least two pedicle screw fixing devices for thoracolumbar posterior correction in the first embodiment;

the connecting rod 400 is inserted into the sliding groove 111 of the pedicle screw fixing device for thoracolumbar posterior correction, and the connecting rod is positioned between the locking member 300 and the groove bottom of the sliding groove 111.

Preferably, the connecting rod 400 is a titanium rod.

It should be noted that, for the specific structure of the pedicle screw fixing device for thoracolumbar posterior correction, reference is made to the description of the first embodiment, and therefore, no further description is given in the second embodiment.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. The utility model provides a thoracolumbar vertebrae way of escape is orthopedic with pedicle screw fixing device which characterized in that includes: the pedicle screw, the limiting piece and the locking piece;

2. The pedicle screw fixation device for thoracolumbar posterior orthopaedic as claimed in claim 1, wherein the sliding groove is provided with a U-shape, and a positioning step is provided on an inner wall of the sliding groove to prevent the stopper from moving toward the screw body.

3. The pedicle screw fixation device for thoracolumbar posterior correction as claimed in claim 1, wherein the outer wall of the screw head is provided with a clamping groove for clamping the screw head and assisting correction.

4. The pedicle screw fixation device for thoracolumbar posterior orthopaedic of claim 1, wherein the stopper is a cylindrical nut, and the stopper is in threaded connection with the sliding groove and has an axially through installation channel therein.

5. The pedicle screw fixation device for thoracolumbar posterior orthopaedic as claimed in claim 4, wherein an end of the stopper remote from the screw body is provided with a polygonal first groove having a diameter larger than that of the installation channel for use with a nut locking device.

6. The pedicle screw fixation device for thoracolumbar posterior orthopaedic as claimed in claim 5, wherein a limiting plate is provided at a position of the mounting channel near the port of the first groove for preventing a locking member from being removed from the mounting channel.

7. The pedicle screw fixation device for thoracolumbar posterior orthotics according to any one of claims 1-6, wherein the locking element is a cylindrical nut, and the locking element is threadedly connected to the mounting channel.

8. The pedicle screw fixation device for thoracolumbar posterior orthopaedic as claimed in claim 7, wherein an end of the locking member remote from the screw body is provided with a polygonal second groove for use with a nut locking device.

9. The pedicle screw fixation device for thoracolumbar posterior orthopaedic as claimed in claim 7, wherein the locking member is provided with an abutting portion near one end of the screw body for abutting against a connecting rod.

10. The pedicle screw fixation device for thoracolumbar posterior orthopaedic of claim 9, wherein the head end of the abutment portion is provided with a spherical shape.

11. The pedicle screw fixation device for thoracolumbar posterior orthopaedic as claimed in claim 1, wherein an outer wall of an end of the screw body portion near the screw head portion is provided with a first thread.

12. The pedicle screw fixation device for thoracolumbar posterior orthopaedic as claimed in claim 11, wherein an outer wall of an end of the screw body portion remote from the screw head portion is provided with a second thread having a pitch larger than a pitch of the first thread.

13. The pedicle screw fixation device for thoracolumbar posterior orthopaedic as claimed in claim 12, wherein the second and first threads are acid-blasted at locations to form a local micro-porous structure.

14. A fixation system comprising a connecting rod and at least two pedicle screw fixation devices for thoracolumbar posterior correction according to any one of claims 1-13;