A lumbar intervertebral disc prosthesis

Abstract

The present application discloses a lumbar intervertebral disc prosthesis, which includes two groups of support assemblies. When the two groups of support assemblies are in working state, they are respectively located on both sides of the first sagittal plane; the support assembly includes two support members, and the rear ends of the two support members are respectively provided with bone screws that can be connected to the vertebrae. One of the support members is provided with a first sliding structure, and the other support member is provided with a second sliding structure. When the first sliding structure and the second sliding structure are connected, they can form a glenoid cavity structure. One of the support members is movably connected to the other support member through the glenoid cavity structure, and the two support members can rotate and tilt relative to each other. The present application using the above structure can reduce surgical incisions and reduce surgical risks.

Description

Technical Field

[0001] The present application belongs to the field of medical device technology, and specifically relates to a lumbar intervertebral disc prosthesis. Background Art

[0002] The intervertebral disc is a fibrous cartilage disc located between two adjacent vertebrae. It is an important component of the human spine. Except for the first and second cervical vertebrae, there are intervertebral discs between other vertebrae of the spine. Adults have a total of 23 intervertebral discs.

[0003] Existing surgical treatments for diseased lumbar intervertebral discs include replacement, which involves removing diseased intervertebral disc tissue and then implanting a lumbar intervertebral disc prosthesis into the body.

[0004] Traditional lumbar disc prostheses are all implanted through anterior lumbar surgery, which requires a surgical incision to be made in the patient's abdomen, and then the lumbar disc prosthesis is delivered to the lumbar spine through the patient's abdomen. However, due to the large number of abdominal organs, the operation is more difficult and has more complications. In addition, the traditional lumbar disc prosthesis has a more complex structure and a larger size, which requires a higher size of the surgical incision, resulting in a larger surgical incision, increasing the difficulty of healing and hindering the patient's recovery. Moreover, when the lumbar disc prosthesis is implanted through the anterior lumbar approach, the anterior longitudinal ligament will be cut, affecting the tension stability of the anterior column structure. Summary of the Invention

[0005] In order to reduce the size of the surgical incision and enable the insertion of a lumbar intervertebral disc prosthesis through a posterior lumbar approach, the present application provides a lumbar intervertebral disc prosthesis.

[0006] A lumbar intervertebral disc prosthesis includes two groups of support assemblies. When the two groups of support assemblies are in working condition, they are respectively located on both sides of a first sagittal plane. The support assembly includes two support members. The rear ends of the two support members are respectively provided with bone screws that can be connected to the vertebrae. One of the support members is provided with a first sliding structure, and the other support member is provided with a second sliding structure. When the first sliding structure and the second sliding structure are connected, they can form a glenoid cavity structure. One of the support members is movably connected to the other support member through the glenoid cavity structure, and the two support members can rotate and tilt relative to each other.

[0007] Because the lumbar disc prosthesis is constructed from two sets of support components, each support component is smaller, allowing it to be inserted between two vertebrae through a smaller surgical incision. Once inserted, the two support components within each component are fixedly connected to the adjacent vertebrae. The two support components within a set of support components are able to move relative to each other, allowing the vertebrae adjacent to the lumbar disc prosthesis to move relative to each other, preserving spinal mobility as much as possible. Furthermore, due to the smaller surgical incision, the lumbar disc prosthesis can be inserted through a posterior approach to the lumbar spine, ensuring the integrity of the anterior longitudinal ligament.

[0008] In one embodiment of the present application, when the two groups of support components are in a working state, the two groups of support components are mirror-imaged with respect to the first sagittal plane.

[0009] When the two groups of support components are in working condition, the two groups of support components are mirror-imaged about the first sagittal plane. The two groups of support components can be mirror-symmetrical relative to the human body's sagittal plane. After the lumbar intervertebral disc prosthesis is implanted, the two groups of support components can stably support human tissue and ensure the stability of the spine.

[0010] In one embodiment of the present application, a projection of the support member on the first cross-section is arc-shaped.

[0011] Since the cross-section of the vertebral body is nearly circular, and the projection of the support member on the first cross-section is an arc, after the two sets of support components are placed between the two vertebrae, the support members in the two sets of support components can fit the shape of the vertebral body, providing more stable support for the vertebrae and other tissues above the lumbar disc prosthesis.

[0012] In one embodiment of the present application, the projection of the support member on the first cross-section is a first projection; the first sliding structure is a sliding protrusion, and the second sliding structure is a sliding groove, and the sliding protrusion is inserted into the sliding groove to form a joint socket structure; the extension direction of the sliding protrusion and the extension direction of the sliding groove are the same as the extension direction of the first projection.

[0013] In one embodiment of the present application, the sliding protrusion is made of pure titanium metal; the sliding groove is made of pure titanium metal or ultra-high molecular polyethylene.

[0014] In one embodiment of the present application, a first sliding structure or a second sliding structure is provided on the sliding side of the support member, the tip of the bone screw is located on the connecting side of the support member, the sliding side and the connecting side are arranged opposite to each other and are respectively provided on both sides of the support member; along the direction from the rear end of the support member to the front end of the support member, the distance between the bone screw and the support member gradually increases.

[0015] In one embodiment of the present application, the projection of the support member on the first cross-section is a first projection; along the extension direction of the first projection, from the rear end of the support member to the front end of the support member, the width of the first projection gradually decreases.

[0016] When inserting the lumbar intervertebral disc prosthesis through the posterior lumbar approach, the front end of the support member can first enter between the vertebrae. Since the rear end of the support member points in the direction of the front end, the width of the first projection gradually decreases, so that the front end of the support member can more easily enter between the vertebrae, facilitating the operation.

[0017] In one embodiment of the present application, the support member is provided with a guide hole, and the guide hole passes through the front end and the rear end of the support member in a straight line.

[0018] During the operation, a Kirschner wire can be used to determine the installation path of the support, and then the guide hole is put on the Kirschner wire, and the Kirschner wire is used to guide the support into the vertebrae to ensure that the support can be installed in place.

[0019] In one embodiment of the present application, the sliding side of the support member is provided with a first sliding structure or a second sliding structure; the connecting side of the support member is provided with a protrusion; the sliding side and the connecting side are arranged opposite to each other and are respectively provided on both sides of the support member.

[0020] The spikes can increase the friction between the support and the vertebrae, thus preventing the support from shifting in the body after the operation.

[0021] In one embodiment of the present application, the sliding side of the support member is provided with a first sliding structure or a second sliding structure; the connecting side of the support member is provided with an anti-slip layer; the sliding side and the connecting side are arranged opposite to each other and are respectively provided on both sides of the support member.

[0022] The anti-slip layer can increase the friction between the support and the vertebrae, thereby preventing the support from shifting in the body after the operation is completed.

[0023] This application has at least the following beneficial effects:

[0024] 1. The lumbar disc prosthesis is constructed from two sets of support components, making each support component smaller. This allows it to be inserted between two vertebrae through a smaller surgical incision. Once inserted, the two support components within each component are fixedly connected to the adjacent vertebrae. The two support components within a set of support components are able to move relative to each other, allowing the vertebrae adjacent to the lumbar disc prosthesis to move relative to each other, preserving spinal mobility as much as possible. Furthermore, due to the smaller surgical incision, the lumbar disc prosthesis can be inserted through a posterior approach, ensuring the integrity of the anterior longitudinal ligament.

[0025] 2. When the two sets of support components are in working condition, the two sets of support components are mirror-imaged about the first sagittal plane. The two sets of support components can be mirror-symmetrical relative to the human body's sagittal plane. After the lumbar intervertebral disc prosthesis is implanted, the two sets of support components can stably support the human tissue and ensure the stability of the spine. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural diagram of an exemplary embodiment of the present application;

[0027] Figure 2is a schematic structural diagram of an exemplary embodiment of the bone screw in the present application;

[0028] Figure 3 This is a structural diagram of an exemplary embodiment of the front end and rear end of the support member in the present application;

[0029] Figure 4 This is a schematic structural diagram of an exemplary embodiment of the sliding protrusion and the sliding groove in the present application;

[0030] Figure 5 This is a structural diagram of an exemplary embodiment of the present application when the sliding protrusion and the sliding groove are combined;

[0031] Figure 6 This is a schematic structural diagram of an exemplary embodiment of a set of support components of the present application;

[0032] Figure 7 is a structural diagram of an exemplary embodiment of the first sagittal plane in this application;

[0033] Figure 8 1 is a schematic structural diagram of an exemplary embodiment of the present application in which two groups of support components are mirror-symmetrical about the first sagittal plane;

[0034] Figure 9 This is a schematic structural diagram of an exemplary embodiment of the present application when placed on a vertebral body;

[0035] Figure 10 It is a structural diagram of another exemplary embodiment of the sliding protrusion and the sliding groove in the present application.

[0036] In the picture:

[0037] 101, support member; 102, sliding protrusion; 103, sliding groove; 104, inserted into the front end; 105, inserted into the rear end; 106, sliding side; 107, connecting side; 108, guide hole; 109, spike; 110, anti-slip layer; 111, first support member; 112, second support member;

[0038] 201. Bone screw; 202. Vertebra; 203. First sagittal plane. DETAILED DESCRIPTION

[0039] In order to have a clearer understanding of the technical features, purposes and effects of the present application, the specific implementation methods of the present application are now described with reference to the accompanying drawings. The same reference numerals in the drawings represent components with the same structure or similar structures but the same functions.

[0040] In this document, “illustrative” means “serving as an example, instance or illustration”, and any diagram or implementation described in this document as “illustrative” should not be interpreted as a more preferred or more advantageous technical solution.

[0041] To simplify the drawings, only the parts related to the present application are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, to simplify the drawings and facilitate understanding, in some figures, only one of the components with the same structure or function is schematically shown or labeled.

[0042] See Figures 1 to 10 Understand this application.

[0043] See also Figure 1 , a lumbar intervertebral disc prosthesis includes two sets of support components.

[0044] See also Figure 2 、 Figure 3 The support assembly includes two support members 101. The rear ends 105 of the two support members 101 are respectively provided with bone screws 201 that can be connected to the vertebrae 202. The support members 101 can enter between the two vertebrae 202 in the waist through a surgical incision on the patient's back. The front end of the support member 101 is located on the side of the lumbar vertebral body close to the abdominal cavity, and the rear end 105 of the support member 101 is located on the side of the lumbar vertebral body away from the abdominal cavity. The bone screws 201 are connected to the back side of the lumbar vertebral body. The support member 101 is fixed between the two vertebrae 202 by the bone screws 201. One of the support members 101 is provided with a first sliding structure, and the other support member 101 is provided with a second sliding structure. When the first sliding structure and the second sliding structure are connected, they can form a joint socket structure. Figure 1 One of the support members 101 is movably connected to the other support member 101 through the glenoid cavity structure, and the two support members 101 can rotate and tilt relative to each other.

[0045] See also Figure 4 In order to better describe the present application, the two support members 101 in a set of support components are respectively named as the first support member 111 and the second support member 112. The first support member 111 is provided with a first sliding structure, which is a sliding protrusion 102; the second support member 112 is provided with a second sliding structure, which is a sliding groove 103; see Figure 5 、 Figure 6 By setting the shape and size of the sliding protrusion 102 and the sliding groove 103, the sliding protrusion 102 can enter the sliding groove 103 and can rotate and tilt to a certain extent relative to the sliding groove 103; the two sets of support components are located between the two lumbar vertebrae and are in the working state. They are respectively located on the first sagittal plane 203 (see Figure 7) on both sides and are located on both sides of the human body's sagittal plane, so that the two groups of support components can support the spine and retain the spinal column's mobility to a certain extent.

[0046] Through surgical incisions in the back, two sets of support components can be placed between the two vertebrae 202 in the waist, and a single set of support components (see Figure 6 ) is inserted between the two vertebrae 202, the first support member 111 and the second support member 112 can be combined in vitro and then the support assembly can be inserted into the patient's body, or the first support member 111 and the second support member 112 can be directly combined in the patient's body, such as the groove wall of the sliding groove 103 is provided with an assembly opening, the sliding protrusion 102 can enter the sliding groove 103 through the assembly opening along the direction parallel to the groove bottom of the sliding groove 103, thereby further reducing the size of the surgical incision, or increasing the distance between the two vertebrae 202 through surgical instruments, and the sliding protrusion 102 enters the sliding groove 103 through the groove of the sliding groove 103 in the patient's body.

[0047] Since the space between the two vertebrae 202 is certain, the present application uses two sets of support components to replace the traditional lumbar intervertebral disc prosthesis. A single set of support components occupies less space, so the surgical incision required for the surgical approach is smaller, the surgical trauma caused to the patient is also smaller, and the difficulty of wound healing is reduced.

[0048] Since the surgical incision can be made on the patient's back rather than the abdomen during the operation, the lumbar disc prosthesis can be inserted through the posterior lumbar approach, thereby ensuring the integrity of the anterior longitudinal ligament. The posterior lumbar approach is used as the surgical approach, and the abdominal organs are not passed during the surgical approach, reducing the surgical risk.

[0049] See also Figures 7 to 9 In one embodiment of the present application, when the two groups of support components are in working state, the two groups of support components are mirrored about the first sagittal plane 203, so that the two groups of support components can better fit on the left and right sides of the vertebral endplate to ensure the stability of the spine.

[0050] When the two groups of support components are in working state, the two groups of support components are mirror-imaged about the first sagittal plane 203. The two groups of support components can be mirror-symmetrical relative to the human body's sagittal plane. After the lumbar disc prosthesis is implanted, the support member 101 can stably support the human tissue and ensure the stability of the spine.

[0051] See also Figure 3 、 Figure 9 In one embodiment of the present application, the projection of the support member 101 on the first cross-section is an arc.

[0052] Since the cross-section of the vertebral body is nearly circular, and the projection of the support member 101 on the first cross-section is an arc, after the two sets of support components are placed between the two vertebrae 202, the support members 101 in the two sets of support components can fit the shape of the vertebral body, providing more stable support for the human body above the lumbar disc prosthesis.

[0053] Furthermore, when the projection of the support member 101 on the first cross-section is arc-shaped and the two groups of support components are in working condition, when the two groups of support components are mirror-set about the first sagittal plane 203, the projections of the two groups of support components on the first cross-section form a ring structure, which can better fit the shape of the vertebral cross-section, and the two groups of support components can better ensure the stability of the spine.

[0054] See also Figure 3 、 Figure 4 、 Figure 9 In one embodiment of the present application, the projection of the support member 101 on the first cross-section is a first projection; the first sliding structure is a sliding protrusion 102, and the second sliding structure is a sliding groove 103, and the sliding protrusion 102 is inserted into the sliding groove 103 to form a fossa structure; the extension direction of the sliding protrusion 102 and the extension direction of the sliding groove 103 are the same as the extension direction of the first projection, and the extension direction of the sliding protrusion 102 and the sliding groove 103 are the same as the extension direction of the first projection, and are all arc-shaped, so that the fossa structure can ensure the mobility of the spine while avoiding excessive rotation of the fossa structure.

[0055] Of course, those skilled in the art in the art to which this application relates will understand that the extension direction of the sliding protrusion 102 and the sliding groove 103 in this application can also be a straight line, which will not be elaborated here.

[0056] In one embodiment of the present application, the sliding protrusion 102 is made of pure titanium metal; the sliding groove 103 is made of pure titanium metal or ultra-high molecular polyethylene to ensure the service life of the present application.

[0057] See also Figure 2 In one embodiment of the present application, the sliding side 106 of the support member 101 is provided with a first sliding structure or a second sliding structure, the tip of the bone screw 201 is located on the connecting side 107 of the support member 101, the sliding side 106 and the connecting side 107 are arranged opposite to each other and are respectively arranged on both sides of the support member 101; along the direction from the insertion rear end 105 of the support member 101 to the insertion front end, the distance between the bone screw 201 and the support member 101 gradually increases, and when the bone screw 201 enters between the vertebrae 202 on the support member 101, the bone screw 201 is tilted relative to the vertebral body, thereby ensuring the contact area between the bone screw 201 and the vertebral body, so that the bone screw 201 can firmly fix the support member 101 to the vertebrae 202.

[0058] See also Figure 3、 Figure 9 In one embodiment of the present application, the projection of the support member 101 on the first cross-section is a first projection; along the extension direction of the first projection, from the insertion rear end 105 of the support member 101 to the insertion front end, the width of the first projection gradually decreases.

[0059] When inserting the lumbar intervertebral disc prosthesis through the posterior lumbar approach, the front end of the support member 101 can first enter between the vertebrae 202. Since the rear end 105 of the support member 101 points in the direction of the front end, the width of the first projection gradually decreases, so that the front end of the support member 101 can more easily enter between the vertebrae 202, facilitating the operation.

[0060] See also Figure 1 、 Figure 3 In one embodiment of the present application, the support member 101 is provided with a guide hole 108, and the guide hole 108 passes through the front end of the support member 101 and the rear end 105 of the support member 101 in a straight line.

[0061] During the operation, a Kirschner wire can be used to determine the installation path of the support member 101, and then the guide hole 108 is put on the Kirschner wire, and the Kirschner wire is used to guide the support member 101 into between the two vertebrae 202 to ensure that the support member 101 can be installed in place.

[0062] See also Figure 1 In one embodiment of the present application, the sliding side 106 of the support member 101 is provided with a first sliding structure or a second sliding structure; the connecting side 107 of the support member 101 is provided with a protrusion 109; the sliding side 106 and the connecting side 107 are arranged opposite to each other and are respectively arranged on both sides of the support member 101.

[0063] The spikes 109 can increase the friction between the support member 101 and the vertebrae 202, thereby preventing the support member 101 from shifting in the body after the operation.

[0064] See also Figure 1 In one embodiment of the present application, the sliding side 106 of the support member 101 is provided with a first sliding structure or a second sliding structure; the connecting side 107 of the support member 101 is provided with an anti-slip layer 110; the sliding side 106 and the connecting side 107 are arranged opposite to each other and are respectively arranged on both sides of the support member 101.

[0065] The anti-slip layer 110 can increase the friction between the support member 101 and the vertebra 202. The anti-slip layer 110 can be a frosted surface processed by a special process, or the anti-slip layer 110 can be an anti-slip coating made of an anti-slip material, or the anti-slip layer 110 can be provided with anti-slip grooves. The anti-slip layer 110 can prevent the support member 101 from shifting in the body after the operation is completed.

[0066] Those skilled in the art of the present application will understand that the first sliding structure and the second sliding structure in the present application can also be other structures, see Figure 10 A sliding groove 103 is provided on the sliding protrusion 102, and a sliding protrusion 102 is provided in the sliding groove 103. The first sliding structure and the second sliding structure are both composed of the sliding protrusion 102 and the sliding groove 103. The first sliding structure and the second sliding structure can fit together and can slide and tilt relative to each other.

[0067] It should be understood that although this specification is described according to various implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0068] The series of detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present application. They are not intended to limit the scope of protection of the present application. Any equivalent implementation plans or changes that do not depart from the technical spirit of the present application, such as the combination, division or repetition of features, should be included in the scope of protection of the present application.

Claims

1. A lumbar intervertebral disc prosthesis, characterized in that: The device comprises two sets of support components, wherein the two sets of support components are respectively located on both sides of the first sagittal plane when in working state; The support assembly includes two support members, each of which is provided with a bone screw capable of connecting to a vertebra at its rear end, one of the support members being provided with a first sliding structure, and the other of the support members being provided with a second sliding structure, wherein the first sliding structure and the second sliding structure are capable of forming a glenoid cavity structure when connected, one of the support members being movably connected to the other of the support members via the glenoid cavity structure, and the two support members being capable of relative rotation and tilt; When the two groups of support components are in a working state, the two groups of support components are mirror-imaged with respect to the first sagittal plane; The projection of the support member on the first cross-section is an arc; The projection of the support member on the first cross-section is a first projection; The first sliding structure is a sliding protrusion, and the second sliding structure is a sliding groove. The sliding protrusion is inserted into the sliding groove to form the glenoid cavity structure; An extending direction of the sliding protrusion and an extending direction of the sliding groove are the same as an extending direction of the first projection.

2. A lumbar intervertebral disc prosthesis according to claim 1, characterized in that: The sliding protrusion is made of pure titanium metal; The sliding groove is made of pure titanium metal or ultra-high molecular polyethylene.

3. The lumbar intervertebral disc prosthesis according to claim 1, characterized in that: The sliding side of the support member is provided with the first sliding structure or the second sliding structure, the tip of the bone screw is located on the connecting side of the support member, and the sliding side is arranged opposite to the connecting side and is respectively provided on both sides of the support member; Along the direction from the rear end of the support member to the front end of the support member, the distance between the bone screw and the support member gradually increases.

4. The lumbar intervertebral disc prosthesis according to claim 1, characterized in that: The projection of the support member on the first cross-section is a first projection; Along the extension direction of the first projection, from the direction where the support member is placed at the rear end to the direction where the support member is placed at the front end, the width of the first projection gradually decreases.

5. The lumbar intervertebral disc prosthesis according to claim 1, characterized in that: The support member is provided with a guide hole, and the guide hole passes through the insertion front end of the support member and the insertion rear end of the support member in a straight line.

6. The lumbar intervertebral disc prosthesis according to claim 1, characterized in that: The sliding side of the support member is provided with the first sliding structure or the second sliding structure; The connection side of the support member is provided with a spike; The sliding side and the connecting side are arranged opposite to each other and are respectively arranged on both sides of the supporting member.

7. The lumbar intervertebral disc prosthesis according to claim 1, characterized in that: The sliding side of the support member is provided with the first sliding structure or the second sliding structure; The connection side of the support member is provided with an anti-slip layer; The sliding side and the connecting side are arranged opposite to each other and are respectively arranged on both sides of the supporting member.

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