CN115568921A - A spinal distraction device - Google Patents

Abstract

The invention discloses a spine distraction device, which comprises: a guide rod; a fixed connector connected with the guide bar; the movable connector is provided with a movable hole, the guide rod penetrates through the movable hole, the movable connector can rotate around the guide rod and can move along the extending direction of the guide rod, and the movable connector and the fixed connector are respectively provided with a fixing mechanism for fixing the pedicle screw; and the locking mechanism is respectively movably connected with the movable connector and the guide rod so as to lock the relative positions of the movable connector and the guide rod. The spine distraction device provided by the invention can fix the pedicle screws, realizes distraction or compression of vertebral bodies, has a simple structure, is convenient to operate, has strong adaptability, and is suitable for being widely applied to reduction operations of fractured vertebral bodies.

Description

A spinal distraction device

technical field

The invention relates to the technical field of medical instruments, in particular to a spinal distraction device.

Background technique

At present, there are two main ways to correct spinal vertebral fractures in spinal surgery. One is through open or minimally invasive surgery, using pedicle screw rod system to distract, reduce, correct and fix the spine. Surgical trauma, high cost, and long postoperative recovery period are not suitable for elderly and frail elderly patients. The other is minimally invasive surgery and external fixator fixation, which has small trauma, low cost, and After removal of the external fixator, normal life can be resumed. It is currently a good way to treat senile compression vertebral fractures. However, this operation mainly restores the shape of the vertebral body through prying and reset, and the functions of longitudinal expansion and compression are limited. .

In order to further solve the problems of longitudinal distraction and loss of compression function of the external fixator, the technical research and development team independently developed a temporary distraction fixation device for vertebroplasty (application number 202011124251.2), but found in the actual use process , the structure of the device is complicated, and the actual situation of the patient is complex and diverse. Due to the limitation of the vertebral body, the two pedicle screws may be on different planes, and when the two pedicle screws are not on the same plane, the The device is difficult to fix the pedicle screw, which is unfavorable for actual clinical use.

Contents of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art. For this reason, the present invention proposes a kind of spinal distraction device.

The solution that the present invention solves its technical problem is:

A spinal distraction device comprising:

guide rod;

a fixed connector connected to the guide rod;

A movable connector, the movable connector is provided with a movable hole, the guide rod is passed through the movable hole, the movable connector can rotate around the guide rod, and can move along the extending direction of the guide rod , the movable connector and the fixed connector are respectively provided with fixing mechanisms for fixing pedicle screws;

A locking mechanism, the locking mechanism is respectively movably connected with the movable connector and the guide rod, so as to lock the distance between the movable connector and the fixed connector.

The present invention has at least the following beneficial effects: the movable connector and the fixed connector can respectively fix the pedicle screw, and the movable connector can move along the extending direction of the guide rod, that is, the distance between the movable connector and the fixed connector can be changed. The distance makes the pedicle screw installed on the movable connector and the pedicle screw installed on the fixed connector close to or far away from each other, so as to realize the compression or expansion of the vertebral body; the locking mechanism can lock the movable connector Lock the position of the movable connector to ensure the distance between the movable connector and the fixed connector, maintain the compression or expansion of the vertebral body, and avoid the compression or expansion of the vertebral body due to the movement of the movable connector during the operation; In addition, because the movable connector can rotate around the guide rod, when the restriction of the vertebral body makes the two pedicle screws on different planes, the two pedicle screws can also be fixed, which has strong adaptability and is beneficial to practical use. clinical use.

As a further improvement of the above technical solution, both the fixed connector and the movable connector are provided with mounting holes and fixing screw holes, the mounting holes are used for pedicle screws to pass through, and the mounting holes are connected to the The fixed screw holes communicate with each other. The fixed connector and the movable connector are also provided with fixed bolts. The fixed bolts are penetrated in the fixed screw holes and connected with the fixed screw holes. The end surface of the can extend into the installation hole, and the installation hole, fixing screw hole and fixing bolt form the fixing mechanism. Insert the pedicle screw into the mounting hole of the fixed connector or movable connector correspondingly, and screw the fixing bolt into the fixing screw hole, so that the fixing bolt and the wall of the mounting hole can clamp the pedicle screw together to realize the alignment of the pedicle screw. Therefore, the two pedicle screws can be stably installed on the spinal distraction device, and the operation is simple and convenient.

As a further improvement of the above technical solution, the fixing mechanism further includes a positioning structure, the positioning structure is movably connected with the end surface of the fixing bolt, the positioning structure can extend into the installation hole, and the positioning mechanism is set There is a contact surface for abutting against the peripheral wall surface of the pedicle screw. The positioning structure can be changed according to the angle of the pedicle screw, and the contact area between the fixing bolt and the peripheral wall of the pedicle screw can be increased through the positioning structure, especially when the fixing bolt is used to fix the end surface of the pedicle screw and the pedicle screw. When there is an included angle between them, the positioning structure can compensate for the included angle, further improving the fastening ability of the fixing bolt to the pedicle screw.

As a further improvement of the above technical solution, the end surface of the fixing bolt is provided with a groove, the positioning structure includes a ball and an abutment block, the groove wall of the groove coincides with the outer surface of the ball, and the inside of the ball Embedded in the groove and movably connected with the groove wall of the groove, the abutment block is connected with the ball and protrudes from the end surface of the fixing bolt, the abutment block is provided with the contact noodle.

Because the ball can rotate in the groove, that is, the direction of the abutting block can be changed. When the pedicle screw is obliquely installed in the mounting hole, the abutting block can also change its direction according to the inclination angle of the pedicle screw, so as to maintain the same The peripheral wall of the pedicle screw is in contact, thereby ensuring the fastening effect on the pedicle screw.

As a further improvement of the above technical solution, the locking mechanism is a nut, the guide rod is provided with an external thread structure, the nut is sleeved on the guide rod, and is connected with the external thread structure, the nut It is rotatably connected with the movable connector.

When the nut is turned, the nut can move along the extension direction of the guide rod, that is, it can drive the entire movable connector to move along the extension direction of the guide rod, thereby changing the distance between the movable connector and the fixed connector, and then changing the two The distance between the pedicle screws can be used to expand or compress the vertebral body according to actual needs; in addition, the external thread structure on the guide rod also serves as a scale, and the number of rotations of the nut can be used to record the vertebral body distraction distance.

As a further improvement of the above technical solution, the movable connector is provided with a mounting groove, and the outer peripheral wall of the nut is provided with a mounting ring, and the mounting ring is rotatably connected to the groove wall of the mounting groove. Due to the mutual limitation of the installation groove and the installation ring, when the nut moves along the extension direction of the guide rod, it can drive the movable connector to move along the extension direction of the guide rod.

As a further improvement of the above technical solution, the installation ring is detachably connected to the installation groove. The installation ring of the nut can be dismantled from the installation groove, that is, the nut can be separated from the movable connector, which is more conducive to the replacement and cleaning of parts.

As a further improvement of the above technical solution, the fixed connector is detachably connected to the guide rod. Since the fixed connector can be detached from the guide rod, it is convenient for packaging, transportation and storage of the spinal distraction device.

As a further improvement of the above technical solution, the fixed connector is provided with a first connection hole, the guide rod is provided with a second connection hole, the axis of the second connection hole forms an included angle with the axis of the guide rod, The spinal distraction device further includes a fixing pin, and the fixing pin passes through the first connection hole and the second connection hole. Through the fixing effect of the fixing pin, the fixing connector and the guide bar cannot be rotated or moved relative to each other, and the structure is simple and the operation is convenient.

As a further improvement of the above technical solution, the guide rod is provided with a positioning block, and the positioning block abuts against the fixed connector. The positioning block can play a role in positioning the installation of the fixed connector, so that the first connection hole and the second connection hole can be more easily aligned with each other, and the installation between the fixed connector and the guide rod can be accelerated.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly describe the drawings that need to be used in the description of the embodiments. Apparently, the described drawings are only some embodiments of the present invention, not all embodiments, and those skilled in the art can obtain other designs and drawings based on these drawings without creative work.

Fig. 1 is a schematic diagram of the overall structure of a spinal distraction device according to an embodiment of the present invention;

Fig. 2 is the structural representation of the guide bar of the embodiment of the present invention;

3 is a schematic structural view of a fixed connector according to an embodiment of the present invention;

Fig. 4 is a schematic structural view of the movable connector of the embodiment of the present invention;

Fig. 5 is the structural representation of the nut of the embodiment of the present invention;

Fig. 6 is a structural schematic diagram of a fixing bolt according to an embodiment of the present invention;

Fig. 7 is the front view of the fixing bolt of the embodiment of the present invention;

Fig. 8 is the sectional view of A-A direction in Fig. 7;

Fig. 9 is a schematic view of the use of the spinal distraction device according to the embodiment of the present invention.

Reference signs: 100, guide rod; 110, positioning block; 120, second connection hole; 200, fixed connector; 210, fixed pin; 220, first connection hole; 300, movable connector; 310, installation groove; 400, nut; 410, installation ring; 500, fixing bolt; 510, contact block; 520, ball; 530, installation hole; 600, pedicle screw; 700, vertebral body.

detailed description

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments which will be described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

In the description of the present invention, several means one or more, and multiple means two or more. Greater than, less than, exceeding, etc. are understood as not including the original number, and above, below, within, etc. are understood as including the original number. If the description of the first and second is only for the purpose of distinguishing the technical features, it cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features relation.

In the description of the present invention, unless otherwise clearly defined, words such as setting, installation, and connection should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

Apparently, the described embodiments are only some of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative efforts belong to The protection scope of the present invention. The various technical features in the present invention can be combined interactively on the premise of not conflicting with each other.

1 to 9, the embodiment of the present invention proposes a spinal distraction device, including a guide rod 100, a fixed connector 200 and a movable connector 300, which can be used in conjunction with two pedicle screws 600. The screw 600 is in contact with the vertebral body 700 to realize the function of compressing and expanding the vertebral body 700 , and the spinal distraction device can fix the position of the pedicle screw 600 to keep the vertebral body 700 in a compressed or expanded state.

It should be noted that when the two pedicle screws 600 are located on different planes, the spinal distraction device in the embodiment of the present invention can also fix the two pedicle screws 600 .

Specifically, the guide rod 100 is provided with a fixed section and a movable section, the central axis of the fixed section and the movable end are on the same straight line, and the fixed section and the movable section extend along the same straight line.

The fixed connector 200 is connected to the fixed section of the guide rod 100 . In this embodiment, the fixed connector 200 is detachably connected to the guide rod 100 . The fixed connector 200 is provided with a fixed hole, and the fixed hole is sleeved on the fixed section, and the fixed connector 200 is also provided with a fixing piece, which is used to fix the fixed connector 200 on the fixed section of the guide rod 100, so that the fixed connection After the device 200 and the guide rod 100 are installed, they cannot move relative to each other.

In this embodiment, the fixed connector 200 is also provided with a first connection hole 220, and the fixed section is provided with a second connection hole 120, the first connection hole 220 can communicate with the second connection hole 120, and the fixing member is a fixing pin 210 , the fixing pin 210 can pass through the first connecting hole 220 and the second connecting hole 120 , so that the fixing connector 200 and the guide rod 100 cannot rotate or move relative to each other.

In this embodiment, the axis of the first connecting hole 220 is perpendicular to the central axis of the guide rod 100 , and the fixing pin 210 and the guide rod 100 are perpendicular to each other. It can be understood that the axis of the second connection hole 120 needs to form a certain angle with the axis of the guide rod 100 to ensure that the fixed connector 200 will not move along the axis of the guide rod 100 after the fixing pin 210 is installed.

In some embodiments, the guide rod 100 is provided with a positioning block 110, and the positioning block 110 is located between the fixed section and the movable section. When the fixed connector 200 is sleeved on the guide rod 100, the end surface of the fixed connector 200 can be aligned with the positioning block 110, so that the fixed connector 200 can be positioned, and the first connection hole 220 and the second connection hole 120 can be communicated more quickly, without moving the fixed connector 200 to make the first connection hole 220 connect with the second connection hole. The holes 120 are aligned so that the fixed connector 200 can be fixed more quickly.

In some embodiments, the positioning block 110 is provided with a positioning groove, and the end surface of the fixed connector 200 is correspondingly provided with a positioning boss, and the positioning boss and the positioning groove match each other. At this time, the positioning boss and the positioning groove can be quickly engaged with each other, so that the fixed connector 200 can be limited more quickly, and the installation of the fixed connector 200 has a prompt effect, and the fixed connector 200 can be rotated without turning the fixed connector 200 again. Aligning the first connection hole 220 with the second connection hole 120 can fix the fixed connector 200 more quickly.

In other embodiments, the fixed connector 200 is connected to the fixed section by welding, gluing, etc., that is, the fixed connector 200 cannot be disassembled from the guide rod 100. In actual use, the fixed connector 200 and the guide rod 100 can be omitted. The installation between the rods 100 works, but it is not conducive to storage and transportation.

The movable connector 300 is provided with a movable hole, and the movable hole is sleeved on the movable section, and the hole wall of the movable hole is movably connected with the movable section. The movable connector 300 can move along the extension direction of the guide rod 100, and can also move around the Axis rotation.

The spinal distraction device also includes a locking mechanism, the locking mechanism is movably connected with the movable segment, and is movably connected with the movable connector 300, which can lock the relative position of the movable connector 300 and the guide rod 100, so that the movable connector 300 can maintain At a suitable position on the guide rod 100, the distance between the movable connector 300 and the fixed connector 200 is maintained, so as to prevent the movable connector 300 from moving when fixing the pedicle screw 600 and affecting the distraction or compression of the vertebral body 700 operation.

It can be understood that both the fixed connector 200 and the movable connector 300 are provided with a fixing mechanism for fixing the pedicle screw 600, and the pedicle screw 600 can be installed on the fixed connector 200 and the movable connector 300, wherein the installation The pedicle screw 600 on the movable connector 300 can rotate following the rotation of the movable connector 300 , and can also move along the extending direction of the guide rod 100 following the movable connector 300 .

It can be understood that since the movable connector 300 can move along the extending direction of the guide rod 100, that is, the movable connector 300 can approach or move away from the fixed connector 200, so that the pedicle screw 600 installed on the fixed connector 200 can be connected with the fixed connector 200. The pedicle screws 600 installed on the movable connector 300 approach or move away from each other to achieve compression or expansion of the vertebral body 700 .

Since the movable connector 300 can rotate around the rotation of the guide rod 100, in actual use, the relative angle between the two pedicle screws 600 can be changed according to the patient's spinal condition, that is, the two pedicle screws 600 can be at different positions. On the same plane, and the spinal distraction device can also achieve fixation, which is suitable for more kinds of spinal conditions.

In some embodiments, both the fixed connector 200 and the movable connector 300 are provided with a mounting hole 530 and a fixing screw hole, and are equipped with a fixing bolt 500. The fixing bolt 500, the mounting hole 530 and the fixing screw hole together form a fixing mechanism. It is used to fix the pedicle screw 600 so that the installation position and installation angle of the pedicle screw 600 remain unchanged, so as to maintain the expansion or compression of the vertebral body 700 .

It can be understood that the pedicle screw 600 can be inserted into the installation hole 530, and the lower end of the pedicle screw 600 is in contact with the vertebral body 700 to stretch or compress the vertebral body 700. The installation hole 530 is in contact with the vertebral body 700 If the fixing screw holes are connected, the fixing bolts 500 can be matched and connected with the fixing screw holes.

When the fixing bolt 500 is passed through the fixing screw hole, the end surface of the fixing bolt 500 can abut against the peripheral wall surface of the pedicle screw 600 installed in the mounting hole 530, where the fixing bolt 500 is used to connect with the pedicle screw. The abutting end surface of the 600 is set as a fixed surface, and the other end surface is set as a rotating surface. The fixation of the pedicle screw 600 is achieved by clamping the fixing surface and the wall of the installation hole 530 , so that the pedicle screw 600 can be stably installed on the spinal distraction device.

In this embodiment, the fixing screw holes are opened along the extending direction of the guide rod 100, and the fixing bolts 500 on the fixed connector 200 are set opposite to the fixing bolts 500 on the movable connector 300, that is, the fixing bolts 500 on the fixed connector 200 The fixing surface of the fixing bolt 500 faces the fixing surface of the fixing bolt 500 on the movable connector 300 . With this arrangement, since the fixing bolts 500 pressurize the upper part of the pedicle screws 600, the lower ends of the two pedicle screws 600 can be kept away from each other, that is, they can be kept in an open state, which can further realize the fracture of the vertebral body. 700's stretch reset.

In other embodiments, the fixing screw holes are also opened along the extending direction of the guide rod 100, and the fixing bolts 500 on the fixed connector 200 are set opposite to the fixing bolts 500 on the movable connector 300, that is, they are located on the fixed connector. The fixing surface of the fixing bolt 500 on the movable connector 200 faces away from the fixing surface of the fixing bolt 500 on the movable connector 300 . With this arrangement, since the fixing bolts 500 pressurize the upper parts of the pedicle screws 600, the lower ends of the two pedicle screws 600 can be kept close to each other, and the compression reduction of the vertebral body 700 can be further realized.

Of course, two fixing bolts 500 and fixing screw holes can also be set on the fixed connector 200 and the movable connector 300. The fixing screw holes are all opened along the extending direction of the guide rod 100. The fixed surfaces of the two fixed bolts 500 on the movable connector 300 are also arranged opposite to each other, that is, the fixed surface of one of the fixed bolts 500 on the fixed connector 200 faces one of the fixed bolts 500 on the movable connector 300 The fixing surface of the other fixing bolt 500 on the fixed connector 200 faces away from the fixing surface of the other fixing bolt 500 on the movable connector 300, so that the two effects in the above two embodiments can be realized, and the operator can Pressurizing the upper part of the pedicle screw 600 according to the actual situation can not only realize the separation of the lower ends of the two pedicle screws 600, but also realize the approach of the lower ends of the two pedicle screws 600, which is more applicable.

In this embodiment, the mounting hole 530 is a rectangular hole with rounded corners, and the inner wall of the mounting hole 530 is provided with a supporting boss, which is located below the fixing bolt 500 and can serve as a fulcrum for the fixing bolt 500, so as to further Good for fixed effects. The support boss protrudes toward the central axis of the mounting hole 530, and the inner wall of the support boss also forms a rounded rectangular hole. The rounded rectangular hole of the support boss communicates with the mounting hole 530, and the pedicle screw 600 can be inserted into the mounting hole. The hole 530 and the rounded rectangular hole formed by the supporting boss.

In this embodiment, the fixing mechanism also includes a positioning structure, which is movably connected with the fixing surface of the fixing bolt 500. The positioning structure is provided with a contact surface. When the fixing bolt 500 is installed in the fixing screw hole, the positioning structure can extend into When entering the installation hole 530 , the contact surface can abut against the outer peripheral wall surface of the pedicle screw 600 installed in the installation hole 530 .

It can be understood that the positioning structure can be changed according to the angle of the pedicle screw 600, and the contact area between the fixing bolt 500 and the peripheral wall of the pedicle screw 600 can be increased through the positioning structure, especially when the fixing surface of the fixing bolt 500 is in contact with the vertebral pedicle screw. When there is an included angle between the pedicle screws 600 , the positioning structure can compensate for the included angle, further improving the fastening ability of the fixing bolt 500 to the pedicle screws 600 .

In this embodiment, the fixed surface of the fixing bolt 500 is provided with a groove, and the positioning structure includes a ball 520 and an abutment block 510. The groove is an arc groove, and its groove wall coincides with the outer surface of the ball 520. Embedded in the groove and movably connected with the groove wall of the groove, that is, the ball 520 can rotate in the groove, the abutment block 510 is connected with the ball 520, and protrudes from the fixed surface, and the contact surface of the positioning structure is set on the abutment On the connecting block 510 , the contact surface of the abutting block 510 can abut against the peripheral wall surface of the pedicle screw 600 installed in the installation hole 530 , so as to realize the fixation of the pedicle screw 600 .

It can be understood that since the ball 520 can rotate in the groove, that is, the direction of the abutment block 510 can be changed, when the pedicle screw 600 is obliquely installed in the installation hole 530, the abutment block 510 can also be adjusted according to the direction of the pedicle. The inclination angle of the screw 600 changes direction to keep the contact surface in contact with the peripheral wall surface of the pedicle screw 600 , thereby ensuring the fastening effect on the pedicle screw 600 .

In this embodiment, the rotating surface of the fixing bolt 500 is provided with a rotating hole, the rotating hole is a hexagonal hole, and the inner hexagonal wrench can be inserted into the rotating hole, and the fixing bolt 500 can be rotated by turning the inner hexagonal wrench. , very convenient. It can be understood that the rotation hole can also be a hole of other shapes, and the fixing bolt 500 can be rotated by a tool matching the rotation hole. Of course, the rotating surface of the fixing bolt 500 can also be hexagonal, and the fixing bolt 500 can be rotated by an external hexagonal wrench.

In this embodiment, the movable section of the guide rod 100 is provided with an external thread structure, and the locking mechanism is a nut 400, which has a screw hole with an internal thread structure, and can be sleeved on the movable section of the guide rod 100, and the movable section The external thread structure on the nut 400 is mated with the internal thread structure of the nut 400 .

It can be understood that when the nut 400 is turned, the nut 400 can move along the extension direction of the movable section, that is, it can drive the entire movable connector 300 to move along the extension direction of the guide rod 100, so that the connection between the movable connector 300 and the fixed connection can be changed. The distance between the two pedicle screws 600 can be changed, and the distance between the two pedicle screws 600 can be changed to expand or compress the vertebral body 700 according to actual needs.

In addition, the external thread structure on the guide rod 100 also functions as a scale, and the number of rotations of the nut 400 can be used to record the distraction distance of the vertebral body 700, which is beneficial to the recording and analysis of clinical data.

Using the nut 400 as the locking mechanism not only can adjust the position of the movable connector 300 on the guide rod 100, but also the adjustment method is simple and convenient. Move, so as to realize the locking of the movable connector 300, and prevent the movable connector 300 from moving during the process of the pedicle screw 600 spreading or compressing the vertebral body 700, thereby affecting the spreading or compressing effect of the pedicle screw 600.

It can be understood that the nut 400 is rotationally connected to the movable connector 300 , and the arrangement of the nut 400 will not affect the rotation of the movable connector 300 around the central axis of the guide rod 100 . In this embodiment, the nut 400 is provided with a mounting ring 410, and the movable connector 300 is provided with a mounting groove 310, the mounting ring 410 is snapped into the mounting groove 310, and the mounting ring 410 can be connected to the groove wall of the mounting groove 310 relative rotation. Due to the mutual restriction of the installation groove 310 and the installation ring 410 , when the nut 400 moves along the extension direction of the guide rod 100 , it can drive the movable connector 300 to move along the extension direction of the guide rod 100 .

The installation ring 410 in this embodiment is arranged on the peripheral wall of the nut 400, that is, the ring hole of the installation ring 410 is connected with the peripheral wall of the nut 400, and the outer peripheral wall of the installation ring 410 is rotated with the groove wall of the installation groove 310 connect.

It can be understood that the installation groove 310 can be a fan-shaped groove, and the opening length of the fan-shaped groove is greater than or equal to the diameter of the installation ring 410, so that the nut 400 can be disassembled from the movable connector 300. When the movable connector 300 and the nut 400 are removed from the After the guide rod 100 is disassembled, the installation ring 410 of the nut 400 can be removed from the installation groove 310, that is, the nut 400 can be separated from the movable connector 300, which is more conducive to the replacement and cleaning of parts.

In this embodiment, the installation groove 310 is a fan-shaped groove with a central angle greater than 180°, which can increase the stress area between the groove wall of the installation groove 310 and the installation ring 410, so that the nut 400 can better drive the movable connector 300 moves along the extending direction of the guide rod 100 .

It can be understood that the rotational connection between the nut 400 and the movable connector 300 can also be realized through other structures. For example, an annular groove is set on the outer peripheral wall of the nut 400, and a movable block is arranged on the movable connector 300. The movable block can be clamped in the annular groove, and can rotate around the outer peripheral wall of the nut 400 along the annular groove. The restriction between the block and the circular groove drives the movable connector 300 to move with the movement of the nut 400 .

In this embodiment, the outer surface of the nut 400 is provided with splines, and the operator can use the spline pliers to turn the nut 400 to realize the movement of the nut 400 along the extending direction of the guide rod 100 , which is more convenient.

In other embodiments, the locking mechanism is a latch, and the movable section of the guide rod 100 is provided with multiple sets of adjustment holes, and each group has a plurality of adjustment holes, and the plurality of adjustment holes in one group surrounds the outer peripheral wall of the guide rod 100 set, and multiple sets of adjustment holes are arranged along the extending direction of the movable section. The movable connector 300 is provided with a through-hole structure for installing the bolt. When the movable connector 300 rotates and moves around the guide rod 100, the through-hole structure can communicate with one of the adjustment holes, and the bolt is passed through the adjustment hole and After the through hole structure is formed, the locking between the movable connector 300 and the guide rod 100 can be realized.

It can be understood that the method of locking the connector and the guide rod 100 through the bolt is more complicated than the method of using the nut 400, which is easy to cause the loss of the bolt. Moreover, the applicability is small, and the movable connector 300 can only be used in the normal way. The position where the hole structure communicates with the adjustment hole is locked with the guide rod 100 . In addition, too many adjustment holes are not conducive to the cleaning and disinfection of the guide rod 100 .

It can be understood that although the movable connector 300 can rotate relative to the nut 400, when the movable connector 300 and the pedicle screw 600 are installed, the fixing mechanism ensures that the movable connector 300 and the pedicle screw 600 There will be no relative movement, and the lower end of the pedicle screw 600 is in contact with the vertebral body 700. Under the restriction of the vertebral body 700, the pedicle screw 600 will not rotate, that is, the movable connector 300 will not go around the guide rod 100 rotations ensure the reliability of the operation.

In the actual use process, the fixed connector 200 is first sleeved on the fixed section of the guide rod 100, so that the end surface of the fixed connector 200 abuts against the positioning block 110, and the fixed connection hole is rotated to make the first connection hole 220 and the second connection hole 220 The two connecting holes 120 are aligned with each other, and the fixing connector 200 and the guide rod 100 are fixed by the fixing pin 210 .

Then, the fixing bolt 500 of the fixing connector 200 is screwed into the fixing screw hole, and one of the pedicle screws 600 is inserted into the mounting hole 530 of the fixing connector 200, so that the lower end of the pedicle screw 600 is aligned with the fixing screw hole. The fixed vertebral body 700 is abutted, and then the fixing bolt 500 of the fixing connector 200 is tightened, so that the abutment block 510 of the fixing bolt 500 of the fixing connector 200 abuts against the outer peripheral wall of the pedicle screw 600, so as to ensure the The pedicle screw 600 will not slide relative to the fixed connector 200 .

Assemble the nut 400 and the movable connector 300 in advance, set the nut 400 and the movable connector 300 on the movable section of the guide rod 100, and turn the nut 400 so that the nut 400 drives the movable connector 300 to move to the movable section. position, insert another pedicle screw 600 into the installation hole 530 of the movable connector 300, so that the lower end of the pedicle screw 600 abuts against the slipped vertebral body 700, and through the fixing screw on the movable connector 300 The pedicle screw 600 is fixed with the movable connector 300 .

Finally, use the spline pliers to turn the nut 400, so that the nut 400 drives the movable connector 300 to move along the extension direction of the movable segment, so as to change the position of the pedicle screw 600 installed on the movable connector 300, so that the two vertebral arches The root nails 600 move away from each other or move closer together. When the two pedicle screws 600 are far away from each other, they can expand the two vertebral bodies 700 ; and when the two pedicle screws 600 are close to each other, they can compress the two vertebral bodies 700 .

To sum up, the spinal distraction device proposed by the embodiment of the present invention has a simple structure, which is beneficial to processing and production. Moreover, during the intraoperative use, the spinal distraction is more reliable, easy to operate, and strong in practicability. It is suitable for being widely used in the reduction operation of the fractured vertebral body 700 .

The preferred embodiments of the present invention have been described in detail above, but the invention is not limited to the described embodiments, and those skilled in the art can also make various equivalent modifications or replacements without violating the spirit of the present invention. These equivalent modifications or replacements are all within the scope defined by the claims of the present application.

Claims (10)

1. A spinal expansion device, characterized in that it comprises: guide rod; a fixed connector connected to the guide rod; A movable connector, the movable connector is provided with a movable hole, the guide rod is passed through the movable hole, the movable connector can rotate around the guide rod, and can move along the extending direction of the guide rod , the movable connector and the fixed connector are respectively provided with fixing mechanisms for fixing pedicle screws; A locking mechanism, the locking mechanism is respectively movably connected with the movable connector and the guide rod, so as to lock the distance between the movable connector and the fixed connector. 2. The spinal distraction device according to claim 1, wherein the fixed connector and the movable connector are provided with mounting holes and fixing screw holes, and the mounting holes are used for pedicle screws through, the mounting hole communicates with the fixing screw hole, the fixed connector and the movable connector are also provided with fixing bolts, the fixing bolts are penetrated in the fixing screw hole, and are connected with the The fixing screw holes are matched and connected, and the end surface of the fixing bolt can extend into the installation hole, and the installation hole, the fixing screw hole and the fixing bolt form the fixing mechanism. 3. The spinal distraction device according to claim 2, wherein the fixing mechanism further comprises a positioning structure, the positioning structure is movably connected with the end surface of the fixing bolt, and the positioning structure can extend into the and the positioning mechanism is provided with a contact surface for abutting against the peripheral wall surface of the pedicle screw. 4. The spinal distraction device according to claim 3, wherein the end surface of the fixing bolt is provided with a groove, the positioning structure includes a ball and an abutment block, and the groove wall of the groove is in contact with the The outer surface of the ball coincides, the ball is embedded in the groove and is movably connected with the groove wall of the groove, the abutting block is connected with the ball and protrudes from the end surface of the fixing bolt, The abutting block is provided with the contact surface. 5. The spinal distraction device according to claim 1, wherein the locking mechanism is a nut, the guide rod is provided with an external thread structure, the nut is sleeved on the guide rod, and is connected with the guide rod. The external thread structure is matched and connected, and the nut is rotatably connected with the movable connector. 6. The spinal distraction device according to claim 5, characterized in that, the movable connector is provided with a mounting groove, and the outer peripheral wall of the nut is provided with a mounting ring, and the mounting ring is connected to the mounting groove. The groove wall is connected by rotation. 7. The spinal distraction device according to claim 6, wherein the installation ring is detachably connected to the installation groove. 8. The spinal distraction device according to claim 1, wherein the fixed connector is detachably connected to the guide rod. 9. The spinal distraction device according to claim 8, wherein the fixed connector is provided with a first connection hole, the guide rod is provided with a second connection hole, and the axis of the second connection hole is in line with the The axes of the guide rods form an included angle, and the spinal distraction device further includes a fixing pin, and the fixing pin passes through the first connecting hole and the second connecting hole. 10. The spinal distraction device according to claim 9, wherein the guide rod is provided with a positioning block, and the positioning block abuts against the fixed connector.

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