Joint micro-motion structure and lumbar assist device

Abstract

The present disclosure relates to the field of joint micro-motion technology, and in particular to a joint micro-motion structure and a lumbar auxiliary device. The present disclosure provides a joint micro-motion structure, comprising a first joint part and a second joint part, wherein one end of the first joint part has a joint cavity opening toward the second joint part, and the second joint part comprises a joint head and a joint rod part, the joint rod part is connected to the joint head part, the joint head part is adapted to the joint cavity and can rotate in the joint cavity, and a limiting member is provided at the opening of the joint cavity, and the limiting member is used to prevent the joint head from falling out of the joint cavity; the joint head part comprises a first joint head and a second joint head connected thereto, the diameter of the first joint head is smaller than the diameter of the second joint head, and the second joint head is connected to the joint rod part. By implementing the technical solution of the present disclosure, it is possible to avoid metal fatigue caused by long-term use of the connection between the joint rod part and the joint head part, thereby avoiding affecting the use effect of the micro-motion structure.

Description

Technical Field

[0001] The present disclosure relates to the technical field of joint micro-motion, and in particular to a joint micro-motion structure and a lumbar auxiliary device. Background Art

[0002] The micro-motion structure is an elastic internal fixation rod with a certain degree of mobility. The micro-motion structure itself has micro-motion characteristics, which can promote nerve decompression and intervertebral fusion in lumbar spinal stenosis and consolidate clinical efficacy.

[0003] The Isobar micro-motion rod is a lumbar fixation system developed by a French company. Made of titanium alloy, it has a range of motion of approximately 9° and is capable of rotation. The micro-motion portion of the rod is constructed with multiple gaskets at the joint. Prolonged compression of the micro-motion area can lead to metal fatigue, damage to the micro-motion structure, and loss of micro-motion function. Existing micro-motion rods that mimic the glenoid fossa and articular head are prone to metal fatigue or deformation at the joint opening between the articular head and the rod body, reducing the rod's rotation angle. Summary of the Invention

[0004] In order to solve the above technical problems, the present disclosure provides a joint micro-motion structure.

[0005] In a first aspect, the present disclosure provides a joint micro-motion structure, comprising a first joint portion and a second joint portion, wherein one end of the first joint portion has a joint cavity opening toward the second joint portion, the second joint portion comprises a joint head and a joint rod portion, the joint rod portion being connected to the joint head portion, the joint head portion being adapted to the joint cavity and being rotatable within the joint cavity, a limit member being provided at the opening of the joint cavity, the limit member being used to prevent the joint head portion from falling out of the joint cavity;

[0006] The joint head includes a first joint head and a second joint head connected thereto. The diameter of the first joint head is smaller than the diameter of the second joint head. The second joint head is connected to the joint rod.

[0007] Optionally, a diameter of a connection between the second joint head and the joint rod is smaller than a diameter of a connection between the second joint head and the first joint head, and a surface of the second joint head is arc-shaped.

[0008] Optionally, the limiting member is close to the surface of the second joint head and is adapted to the side surface of the second joint head.

[0009] Optionally, the connection between the first joint head and the second joint head forms an angle of 90 degrees.

[0010] Optionally, the connection between the first joint head and the second joint head has an arc-shaped transition.

[0011] Optionally, the width W1 of the first joint head is smaller than the width W2 of the second joint head.

[0012] Optionally, an elastic pad is provided between the second joint head and the limiting member, and a surface of the elastic pad facing the second joint head is adapted to a side surface of the second joint head.

[0013] Optionally, there is a preset gap between the joint head and the joint cavity, so that the joint head can rotate within a preset angle relative to the joint cavity; the preset gap ranges from 0.5 mm to 2.0 mm.

[0014] Optionally, a through hole is further provided on the first joint portion, and the through hole is connected to the interior of the joint cavity.

[0015] In a second aspect, the present invention provides a lumbar auxiliary device, comprising at least two pedicle screws and at least two of the above-mentioned joint micro-motion structures, wherein the two joint micro-motion structures are respectively arranged between two adjacent pedicle screws for connecting the two adjacent pedicle screws.

[0016] Compared with the prior art, the beneficial effects of the present disclosure are: the present disclosure sets a first joint head and a second joint head connected thereto, and the diameter of the first joint head is smaller than the diameter of the second joint head, that is, the first joint head and the second joint head form a "cross" structure, so that the range of motion in the joint cavity is wider and can be restricted by the edges and corners generated by the cross structure, and the stress generated during micro-motion can be concentrated and dispersed to the head, avoiding metal fatigue caused by long-term use of the connection between the joint rod and the joint head, which affects the use effect of the micro-motion structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0018] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0019] Figure 1 This is a schematic structural diagram of the first embodiment of the present disclosure;

[0020] Figure 2 is a structural diagram of the second embodiment of the present disclosure;

[0021] Figure 3 Schematic diagram of the structure of the third embodiment of the present disclosure;

[0022] Figure 4 This is a schematic structural diagram of the fourth embodiment of the present disclosure.

[0023] Among them, 1-first joint part; 11-joint cavity; 2-second joint part; 21-joint head; 211-first joint head; 212-second joint head; 22-joint rod; 3-limiting part; 4-elastic pad. DETAILED DESCRIPTION

[0024] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features therein can be combined with each other in the absence of conflict.

[0025] In the description of the present disclosure, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present disclosure and simplifying the description, and 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. Therefore, they cannot be understood as limitations on the present disclosure.

[0026] In the description of this disclosure, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this disclosure depending on the specific circumstances.

[0027] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0028] Existing micro-movement rods, such as the Isobar, are made of titanium alloy. Their range of motion is approximately 9°, and they also offer rotational functionality. The micro-movement portion of the rod is constructed with multiple gaskets at the joints. Prolonged compression of the micro-movement area can lead to metal fatigue, damage to the micro-movement structure, and loss of micro-movement function. Existing micro-movement rods that mimic the glenoid fossa and articular head are susceptible to metal fatigue or deformation at the glenoid fossa opening, where the head connects to the rod body, reducing the rod's rotational range.

[0029] Based on this, the embodiment of the present disclosure provides a joint micro-motion structure, which allows a wider range of motion in the joint cavity and can be restricted by the sharp corners generated by the cross structure, so that the stress generated during micro-motion can be concentrated and dispersed to the head, avoiding metal fatigue at the connection between the joint rod and the joint head due to long-term use, which affects the use effect of the micro-motion structure.

[0030] The joint micro-motion structure is described in detail below through specific embodiments:

[0031] Reference Figures 1 to 4 As shown, the present disclosure provides a structure for joint micro-motion, including a first joint part 1 and a second joint part 2, which form a structure imitating a joint head and a joint socket. Specifically, one end of the first joint part 1 has a joint cavity 11 opening toward the second joint part 2, and the second joint part 2 includes a joint head 21 and a joint rod 22. The joint rod 22 is connected to the joint head 21, and the joint head 21 is adapted to the joint cavity 11. Specifically, after the joint head 21 and the joint cavity 11 are morphologically matched, the flexion and extension angles of the joint head 21 in all directions reach 15 degrees, thereby adapting to the range of motion of the segmental lumbar vertebrae within a certain degree, thereby maintaining the active function of the lumbar vertebrae. Furthermore, a limiting member 3 is provided at the opening of the joint cavity 11, and the limiting member is used to prevent the joint head 21 from falling out of the joint cavity 11.

[0032] Continue to refer to Figure 1 As shown, further, the joint head 21 includes a first joint head 211 and a second joint head 212 connected thereto, the diameter of the first joint head 211 is smaller than the diameter of the second joint head 212, and the second joint head 212 is connected to the joint rod 22. That is, the cross-section of the first joint head 211 and the second joint head 212 is a "cross" (or includes the joint rod 22), so an angle is formed at the connection between the first joint head 211 and the second joint head 212, and the internal shape of the joint cavity 11 matches it to form a protrusion, which is different from the circular elliptical joint head in the prior art. In this way, when the joint head 21 slightly moves, it is blocked by the protrusion, thereby sharing part of the stress, thereby reducing metal fatigue at the connection between the joint rod 22 and the joint head 21.

[0033] In the first embodiment of the present disclosure, referring to Figure 1 As shown, the diameter of the second joint head 212 at its connection with the joint rod 22 is smaller than the diameter of the second joint head 212 at its connection with the first joint head 211. From a cross-sectional view, the second joint head 212 is trapezoidal. To ensure smoother rotation, the side surfaces of the second joint head 212 are configured as curved surfaces. Overall, the second joint head 212 is hemispherical. Furthermore, the connecting surface between the second joint head 212 and the first joint head 211 is flat. Preferably, the connection between the first joint head 211 and the second joint head 212 forms a 90-degree angle, which provides the best resistance to metal fatigue.

[0034] In the second embodiment of the present disclosure, referring to Figure 2 The connection between the first joint head 211 and the second joint head 212 is an arc-shaped transition. Different from the first embodiment, the joint head 21 of this embodiment matches the joint cavity 11 more smoothly, and the movement angle of the joint head 21 in the joint cavity 11 is larger and smoother.

[0035] In the third embodiment of the present disclosure, referring to Figure 3 The bottom surface of the second joint head 212 forms a concave angle with the connection point of the joint rod 22, and the width of the first joint head 211 in its plugging direction is greater than the width of the second joint head 212. This embodiment has the best stability.

[0036] In the above three embodiments, the limiter 3 of the present disclosure is close to the surface of the second joint head 212 and is adapted to the side surface of the second joint head 212, so that the contact surface of the limiter 3 and the second joint head 212 are in smoother contact, avoiding the jamming situation that affects the micro-motion effect. Figures 1 to 3 As shown, an elastic pad 4 is provided between the second joint head 212 and the limiting member 3 , and the surface of the elastic pad 4 facing the second joint head 212 is adapted to the side surface of the second joint head 212 .

[0037] In the fourth embodiment of the present disclosure, the width W1 of the first joint head 211 is smaller than the width W2 of the second joint head 212, and this embodiment does not include the elastic pad 4. All components of this embodiment are made of titanium metal.

[0038] In addition, in order to ensure the rotation between the joint head 21 and the joint cavity 11, there is a preset gap between the joint head 21 and the joint cavity 11, so that the joint head 21 can rotate within a preset angle relative to the joint cavity 11; the preset gap ranges from 0.5mm to 2.0mm, for example 0.5mm or 2mm, and the specific value of the gap between the joint head 21 and the joint cavity 11 is set according to actual needs.

[0039] In some embodiments, continue to refer to Figures 1 to 4 The first joint portion 1 of the present invention is also provided with at least one through hole 5, which is in communication with the interior of the joint cavity 11. The specific location of the through holes 5 can be one, two, four, etc., and the present invention specifically selects to provide two through holes 5, and the two through holes 5 are provided on opposite sides of the first joint portion 1. The main function of the through holes 5 of the present invention is to allow tissue fluid or tissue to enter the joint cavity 11 during the patient's postoperative recovery process, reducing metal friction and improving the biomimetic properties of the present invention.

[0040] The present disclosure also provides a lumbar vertebrae assist device comprising at least two pedicle screws and at least two joint micro-motion structures as described above, wherein the two joint micro-motion structures are respectively disposed between two adjacent pedicle screws to connect the two adjacent pedicle screws. During a specific lumbar spine surgery, after two pedicle screws are implanted in the patient's lumbar spine to perform nerve decompression, the joint micro-motion structures are fixed to the pedicle screws on both sides, thereby enabling the lumbar segment to maintain a certain degree of mobility while also assisting in enhancing lumbar stability.

[0041] It should be noted that, in this article, relational terms such as "first joint portion" and "second joint portion" etc. are only used to distinguish an entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "comprising" or any other variant thereof are intended to encompass non-exclusive inclusion, so that the process, method, article or equipment comprising a series of key elements not only include those key elements, but also include other key elements not clearly listed, or also include key elements inherent to such process, method, article or equipment. In the absence of more restrictions, the key elements limited by statement "comprising one..." do not exclude the existence of other identical key elements in the process, method, article or equipment comprising said key elements.

[0042] The foregoing description is intended only to provide specific embodiments of the present disclosure, intended to enable those skilled in the art to understand and implement the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure is not intended to be limited to the embodiments described herein, but rather to be construed in the broadest manner consistent with the principles and novel features disclosed herein.

Claims

1. A joint micro-motion structure, characterized in that: The invention comprises a first joint part (1) and a second joint part (2), wherein one end of the first joint part (1) has a joint cavity (11) opening toward the second joint part (2), wherein: The second joint portion (2) comprises a joint head (21) and a joint rod (22), wherein the joint rod (22) is connected to the joint head (21), the joint head (21) is adapted to the joint cavity (11) and can rotate in the joint cavity (11), and a limiting member (3) is provided at the opening of the joint cavity (11), and the limiting member is used to prevent the joint head (21) from falling out of the joint cavity (11); The joint head (21) comprises a first joint head (211) and a second joint head (212) connected thereto, the diameter of the first joint head (211) being smaller than the diameter of the second joint head (212), and the second joint head (212) being connected to the joint rod (22); The diameter of the connection between the second joint head (212) and the joint rod (22) is smaller than the diameter of the connection between the second joint head (212) and the first joint head (211), and the side surface of the second joint head (212) is arc-shaped; The limiting member (3) is close to the surface of the second joint head (212) and is adapted to the side surface of the second joint head (212); A preset gap is provided between the joint head (21) and the joint cavity (11), so that the joint head (21) can rotate within a preset angle relative to the joint cavity (11); the preset gap ranges from 0.5 mm to 2.0 mm.

2. The joint micro-motion structure according to claim 1, characterized in that: The connection between the first joint head (211) and the second joint head (212) forms an angle of 90 degrees.

3. The joint micro-motion structure according to claim 1, characterized in that: The connection between the first joint head (211) and the second joint head (212) is an arc-shaped transition.

4. The joint micro-motion structure according to claim 1, characterized in that: The width W1 of the first joint head (211) is smaller than the width W2 of the second joint head (212).

5. The joint micro-motion structure according to claim 1, characterized in that: An elastic pad (4) is provided between the second joint head (212) and the limiting member (3), and the surface of the elastic pad (4) facing the second joint head (212) is adapted to the side surface of the second joint head (212).

6. The joint micro-motion structure according to any one of claims 1 to 5, characterized in that: The first joint part (1) is also provided with a through hole (5), and the through hole (5) is communicated with the interior of the joint cavity (11).

7. A lumbar assist device, characterized in that: It comprises at least two pedicle screws and at least two joint micro-motion structures according to any one of claims 1 to 6, wherein the two joint micro-motion structures are respectively arranged between two adjacent pedicle screws for connecting the two adjacent pedicle screws.

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