A locking device for a plugless thoracolumbar posterior fixation system

Abstract

This invention discloses a locking device for a plugless posterior thoracolumbar fixation system, comprising an outer tube, a core rod, and an outer sleeve. One end of the core rod has a stud, and the other end has an annular groove on its side. One end of the annular groove has a first step, and the other end has a second step. The core rod also has a clearance hole on its side. A tail block is rotatably connected inside the outer tube, and the tail block has an internal threaded hole. The stud is threaded onto the tail block. The outer tube has a first shaft hole and a second shaft hole on its side. One end of the outer tube has two clamping arms, one end of which has a hook, and the inner side of each clamping arm has a first protrusion. One end of the outer sleeve has a third shaft hole on its side, and the other end of the outer sleeve has clamping plates around its perimeter. One end of each clamping plate has a clamping groove, and the inner side of each clamping plate has a second protrusion. A second handle for up-and-down movement is also included. This invention allows for simultaneous locking and clamping of the pressure rod, greatly simplifying the surgeon's operation and shortening the surgical time.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more specifically, to a locking device for a screwless posterior thoracolumbar fixation system. Background Technology

[0002] Conventional posterior thoracolumbar internal fixation systems, after implanting pedicle screws and inserting titanium rods, often result in excessively high notches and subsequent plug loosening after surgery by using a pre-locking or final-locking screwdriver to drive the screw plugs. Plug-free posterior thoracolumbar screw-rod internal fixation systems, on the other hand, feature low notches and are resistant to loosening, significantly reducing interference and damage to soft tissues and shortening recovery time. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a locking device for a screwless thoracolumbar posterior fixation system.

[0004] To solve the above-mentioned technical problems, the purpose of this invention is achieved as follows: The locking device of the screwless thoracolumbar posterior fixation system includes an outer tube, a core rod that can move axially inside the outer tube, and an outer sleeve that can move axially outside the outer tube.

[0005] One end of the core rod is provided with a stud portion, and the other end is provided with an annular groove on its side. The end of the annular groove near the stud portion has a first step integral with the core rod, and the end away from the stud portion has a second step integral with the core rod. The side of the core rod is provided with a radially penetrating and axially extending clearance hole.

[0006] The outer sleeve is rotatably connected to a tail block, which has an internal threaded hole. The stud is threaded into the internal threaded hole of the tail block. The tail block is provided with a first handle for controlling rotation. The outer sleeve has a first shaft hole and a second shaft hole that pass through the clearance hole on its side. One end of the outer sleeve is provided with two clamping arms that are spaced apart at an angle of 180° and extend along the axial direction of the outer sleeve. The inner side of the clamping arm that is not connected to the outer sleeve is provided with a hook. The inner side of the clamping arm is also provided with a first protrusion that matches the second step.

[0007] One side of the outer sleeve is provided with a third shaft hole that matches the second shaft hole. At least three clips extending axially are distributed around the other side of the outer sleeve. The side of the clip that is not connected to the outer sleeve is provided with a clamping groove. The inner side of the clip is also provided with a second protrusion that matches the first step.

[0008] It also includes a second handle that can be moved up and down. The second handle has a fourth shaft hole that matches the first shaft hole. Connecting rods are rotatably connected to both sides of the second handle. A first pin is inserted into the connecting rod and rotatably connected to the second shaft hole and the third shaft hole. A second pin is inserted into the fourth shaft hole and the first shaft hole and rotatably connected to the second handle.

[0009] The invention is further configured such that: a window extending axially is provided on the side of the outer sleeve, and the window is marked with an upper limit scale line and a lower limit scale line.

[0010] The present invention is further configured such that the viewing windows are arranged in a circular array around the axis of the outer sleeve.

[0011] The present invention is further configured such that the first handle has a cross-shaped structure.

[0012] The present invention is further configured such that the first handle is made of bakelite material.

[0013] In summary, the present invention has the following beneficial effects: Compared with conventional posterior thoracolumbar fixation systems equipped with screw plugs, the locking device of the screw-free thoracolumbar fixation system of the present invention can simultaneously complete the locking requirements of the screw and the rod, greatly simplifying the surgeon's operation process, shortening the operation time, and having complete overall functions and strong practicality. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0015] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0016] Figure 3 This is a schematic diagram illustrating the structure of the outer jacket of this invention;

[0017] Figure 4 This is a schematic diagram illustrating the structure of the core rod in this invention;

[0018] Figure 5 This is a partial structural schematic diagram of the present invention;

[0019] Figure 6 This is a partial schematic diagram of the two structures of the present invention;

[0020] Figure 7 This is a partial three-structure schematic diagram of the present invention;

[0021] Figure 8 This is a structural schematic diagram illustrating the outer garment of the present invention;

[0022] Figure 9 This is a schematic diagram of the internal structure of the present invention in its working state;

[0023] Figure 10 This is a partial structural diagram of the present invention in its working state. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solutions of the present invention, preferred embodiments of the present invention are described below in conjunction with specific examples. However, it should be understood that these descriptions are merely for further illustrating the features and advantages of the present invention, and not for limiting the scope of the patent claims of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0025] The present invention will be further described below with reference to the accompanying drawings and preferred embodiments.

[0026] Example 1

[0027] See Figures 1 to 10 As shown, the locking device of the screwless thoracolumbar posterior fixation system involving this embodiment includes an outer tube 100, a core rod 200 that can move axially inside the outer tube 100, and an outer sleeve 300 that can move axially outside the outer tube 100.

[0028] The core rod 200 has a stud portion 201 at one end and an annular groove 202 on the side of the other end. The annular groove 202 has a first step 203 integrated with the core rod at the end near the stud portion and a second step 204 integrated with the core rod at the end away from the stud portion. The side of the core rod 200 has a radially penetrating and axially extending clearance hole 205.

[0029] The outer sleeve 100 is rotatably connected to a tail block 101, which has an internal threaded hole (not marked). The stud portion 201 is threaded into the internal threaded hole of the tail block 101. The tail block 101 is provided with a first handle 102 for controlling rotation. The outer sleeve 100 has a first shaft hole 103 and a second shaft hole 104 through the clearance hole on its side. One end of the outer sleeve 100 is provided with two clamping arms 105 spaced apart at an angle of 180°. The clamping arms 105 extend along the axial direction of the outer sleeve. The inner side of the end of the clamping arm 105 not connected to the outer sleeve is provided with a hook 106. The inner side of the clamping arm 105 is also provided with a first protrusion 107 that matches the second step.

[0030] The outer sleeve 300 has a third shaft hole 301 that matches the second shaft hole on one side, and at least three clips 302 that extend axially are arranged around the other side of the outer sleeve 300. The clips 302 have a clamping groove 303 on the side of the end that is not connected to the outer sleeve, and a second protrusion 304 that matches the first step is also provided on the inner side of the clips 302.

[0031] It also includes a second handle 400 that can be moved up and down. The second handle 400 has a fourth shaft hole 401 that matches the first shaft hole. Connecting rods 402 are rotatably connected to both sides of the second handle 400. A first pin 403 is inserted into the connecting rod 402 and rotatably connected to the second shaft hole and the third shaft hole. A second pin 404 is inserted into the fourth shaft hole 401 and the first shaft hole 103 and rotatably connected to the second handle 400.

[0032] Furthermore, the outer sleeve 100 has a viewing window 108 extending axially on its side, and the viewing window 108 is marked with an upper limit scale line (unmarked) and a lower limit scale line (unmarked).

[0033] Furthermore, the windows 108 are arranged in a ring array around the axis of the outer sleeve 100.

[0034] Furthermore, the first handle 102 has a cross-shaped structure; the first handle 102 is made of bakelite material.

[0035] In this implementation, firstly, by rotating the first handle counterclockwise, the tail block rotates, causing the core rod to move upward with the help of the thread. By observing the relative position of the core rod and the outer tube, when the color ring on the core rod coincides with the scale on the outer tube, the rotation of the first handle is stopped. At this time, the first step at the end of the core rod contacts the first protrusion on the inner side of the lower clamping arm of the outer tube, lifting the first protrusion and thus opening the end of the clamping arm. Secondly, by pressing down the second handle, the outer tube moves downward. At this time, the second step at the end of the core rod contacts the second protrusion on the inner side of the end of the outer tube, lifting the second protrusion and thus opening the end.

[0036] Place the titanium rod in the slot at the end of the sleeve, align the end of the sleeve with the nail head, and position it above the nail head. By lifting the second handle, the outer tube moves upward, and the second step at the end of the core rod separates from the second protrusion on the inner side of the outer sleeve, thus closing the end and achieving a tight connection between the pedicle screw nail head and the core rod. Next, by rotating the first handle clockwise, the tail block rotates, and with the help of the thread, the core rod moves downward. When the first step at the end of the core rod separates from the first protrusion on the inner side of the lower clamping arm of the outer sleeve, the clamping arm ends close, thus connecting the hook at the head of the clamping arm with the inner liner of the pedicle screw.

[0037] Continue rotating the first handle clockwise. The core rod moves downward. After the end of the core rod contacts the rod, continue moving downward to push the titanium rod into the inner liner. When the color ring on the core rod coincides with the lower scale of the outer tube, stop rotating the first handle. At this time, an interference fit is formed between the titanium rod, the inner liner, and the nail head, thus locking the titanium rod.

[0038] Rotate the first handle counterclockwise until the color ring on the core rod aligns with the scale on the outer tube, then stop rotating the first handle to separate the locking device from the inner liner. Next, press down the second handle to separate the locking device from the nail head. At this point, remove the locking device from the nail head to complete the locking operation of the titanium rod.

[0039] The locking device of the screwless thoracolumbar posterior fixation system involved in this invention differs from conventional thoracolumbar posterior fixation systems equipped with screw plugs, where the rod and screw plug locking are performed separately, requiring the rod to be pressed into the screw cap before the screw plug can be screwed in for locking. In the screwless thoracolumbar posterior fixation system, this invention can simultaneously complete the rod pressing and locking requirements during the locking process of the titanium rod, greatly simplifying the surgeon's operation, shortening the operation time, and providing comprehensive functionality and strong practicality.

[0040] Unless otherwise specified, in this invention, terms such as "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the actual orientation or positional relationship shown. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe orientation or positional relationships in this invention are for illustrative purposes only and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood in conjunction with the embodiments and according to the specific circumstances.

[0041] Unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" in this invention should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0042] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A locking device for a screwless posterior thoracolumbar fixation system, comprising an outer sleeve, characterized in that: The outer sleeve is provided with a core rod that can move axially, and the outer sleeve is provided with an outer sleeve that can move axially. One end of the core rod is provided with a stud portion, and the other end is provided with an annular groove on its side. The end of the annular groove near the stud portion has a first step integral with the core rod, and the end away from the stud portion has a second step integral with the core rod. The side of the core rod is provided with a radially penetrating and axially extending clearance hole. The outer sleeve is rotatably connected to a tail block, which has an internal threaded hole. The stud is threaded into the internal threaded hole of the tail block. The tail block is provided with a first handle for controlling rotation. The outer sleeve has a first shaft hole and a second shaft hole that pass through the clearance hole on its side. One end of the outer sleeve is provided with two clamping arms that are spaced apart at an angle of 180° and extend along the axial direction of the outer sleeve. The inner side of the clamping arm that is not connected to the outer sleeve is provided with a hook. The inner side of the clamping arm is also provided with a first protrusion that matches the second step. One side of the outer sleeve is provided with a third shaft hole that matches the second shaft hole. At least three clips extending axially are distributed around the other side of the outer sleeve. The side of the clip that is not connected to the outer sleeve is provided with a clamping groove. The inner side of the clip is also provided with a second protrusion that matches the first step. It also includes a second handle that can be moved up and down. The second handle has a fourth shaft hole that matches the first shaft hole. Connecting rods are rotatably connected to both sides of the second handle. A first pin is inserted into the connecting rod and rotatably connected to the second shaft hole and the third shaft hole. A second pin is inserted into the fourth shaft hole and the first shaft hole and rotatably connected to the second handle.

2. The locking device for the screwless posterior thoracolumbar fixation system according to claim 1, characterized in that: The outer sleeve has a viewing window extending axially on its side, and the viewing window is marked with an upper limit scale line and a lower limit scale line.

3. The locking device for the screwless posterior thoracolumbar fixation system according to claim 2, characterized in that: The windows are arranged in a circular array around the axis of the outer sleeve.

4. The locking device for the screwless posterior thoracolumbar fixation system according to any one of claims 1-3, characterized in that: The first handle has a cross-shaped structure.

5. The locking device for the screwless posterior thoracolumbar fixation system according to claim 4, characterized in that: The first handle is made of bakelite.

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